4 * Copyright (C) International Business Machines Corp., 2002,2011
5 * Author(s): Steve French (sfrench@us.ibm.com)
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.
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.
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
22 #include <linux/net.h>
23 #include <linux/string.h>
24 #include <linux/list.h>
25 #include <linux/wait.h>
26 #include <linux/slab.h>
27 #include <linux/pagemap.h>
28 #include <linux/ctype.h>
29 #include <linux/utsname.h>
30 #include <linux/mempool.h>
31 #include <linux/delay.h>
32 #include <linux/completion.h>
33 #include <linux/kthread.h>
34 #include <linux/pagevec.h>
35 #include <linux/freezer.h>
36 #include <linux/namei.h>
37 #include <asm/uaccess.h>
38 #include <asm/processor.h>
39 #include <linux/inet.h>
40 #include <linux/module.h>
41 #include <keys/user-type.h>
43 #include <linux/parser.h>
47 #include "cifsproto.h"
48 #include "cifs_unicode.h"
49 #include "cifs_debug.h"
50 #include "cifs_fs_sb.h"
53 #include "rfc1002pdu.h"
57 #define RFC1001_PORT 139
59 extern mempool_t *cifs_req_poolp;
61 /* FIXME: should these be tunable? */
62 #define TLINK_ERROR_EXPIRE (1 * HZ)
63 #define TLINK_IDLE_EXPIRE (600 * HZ)
67 /* Mount options that take no arguments */
68 Opt_user_xattr, Opt_nouser_xattr,
69 Opt_forceuid, Opt_noforceuid,
70 Opt_forcegid, Opt_noforcegid,
71 Opt_noblocksend, Opt_noautotune,
72 Opt_hard, Opt_soft, Opt_perm, Opt_noperm,
73 Opt_mapchars, Opt_nomapchars, Opt_sfu,
74 Opt_nosfu, Opt_nodfs, Opt_posixpaths,
75 Opt_noposixpaths, Opt_nounix,
78 Opt_forcemandatorylock, Opt_setuids,
79 Opt_nosetuids, Opt_dynperm, Opt_nodynperm,
80 Opt_nohard, Opt_nosoft,
82 Opt_nostrictsync, Opt_strictsync,
83 Opt_serverino, Opt_noserverino,
84 Opt_rwpidforward, Opt_cifsacl, Opt_nocifsacl,
85 Opt_acl, Opt_noacl, Opt_locallease,
86 Opt_sign, Opt_seal, Opt_noac,
87 Opt_fsc, Opt_mfsymlinks,
88 Opt_multiuser, Opt_sloppy,
90 /* Mount options which take numeric value */
91 Opt_backupuid, Opt_backupgid, Opt_uid,
92 Opt_cruid, Opt_gid, Opt_file_mode,
93 Opt_dirmode, Opt_port,
94 Opt_rsize, Opt_wsize, Opt_actimeo,
96 /* Mount options which take string value */
97 Opt_user, Opt_pass, Opt_ip,
99 Opt_srcaddr, Opt_prefixpath,
101 Opt_netbiosname, Opt_servern,
102 Opt_ver, Opt_vers, Opt_sec, Opt_cache,
104 /* Mount options to be ignored */
107 /* Options which could be blank */
115 static const match_table_t cifs_mount_option_tokens = {
117 { Opt_user_xattr, "user_xattr" },
118 { Opt_nouser_xattr, "nouser_xattr" },
119 { Opt_forceuid, "forceuid" },
120 { Opt_noforceuid, "noforceuid" },
121 { Opt_forcegid, "forcegid" },
122 { Opt_noforcegid, "noforcegid" },
123 { Opt_noblocksend, "noblocksend" },
124 { Opt_noautotune, "noautotune" },
125 { Opt_hard, "hard" },
126 { Opt_soft, "soft" },
127 { Opt_perm, "perm" },
128 { Opt_noperm, "noperm" },
129 { Opt_mapchars, "mapchars" },
130 { Opt_nomapchars, "nomapchars" },
132 { Opt_nosfu, "nosfu" },
133 { Opt_nodfs, "nodfs" },
134 { Opt_posixpaths, "posixpaths" },
135 { Opt_noposixpaths, "noposixpaths" },
136 { Opt_nounix, "nounix" },
137 { Opt_nounix, "nolinux" },
138 { Opt_nocase, "nocase" },
139 { Opt_nocase, "ignorecase" },
141 { Opt_nobrl, "nobrl" },
142 { Opt_nobrl, "nolock" },
143 { Opt_forcemandatorylock, "forcemandatorylock" },
144 { Opt_forcemandatorylock, "forcemand" },
145 { Opt_setuids, "setuids" },
146 { Opt_nosetuids, "nosetuids" },
147 { Opt_dynperm, "dynperm" },
148 { Opt_nodynperm, "nodynperm" },
149 { Opt_nohard, "nohard" },
150 { Opt_nosoft, "nosoft" },
151 { Opt_nointr, "nointr" },
152 { Opt_intr, "intr" },
153 { Opt_nostrictsync, "nostrictsync" },
154 { Opt_strictsync, "strictsync" },
155 { Opt_serverino, "serverino" },
156 { Opt_noserverino, "noserverino" },
157 { Opt_rwpidforward, "rwpidforward" },
158 { Opt_cifsacl, "cifsacl" },
159 { Opt_nocifsacl, "nocifsacl" },
161 { Opt_noacl, "noacl" },
162 { Opt_locallease, "locallease" },
163 { Opt_sign, "sign" },
164 { Opt_seal, "seal" },
165 { Opt_noac, "noac" },
167 { Opt_mfsymlinks, "mfsymlinks" },
168 { Opt_multiuser, "multiuser" },
169 { Opt_sloppy, "sloppy" },
171 { Opt_backupuid, "backupuid=%s" },
172 { Opt_backupgid, "backupgid=%s" },
173 { Opt_uid, "uid=%s" },
174 { Opt_cruid, "cruid=%s" },
175 { Opt_gid, "gid=%s" },
176 { Opt_file_mode, "file_mode=%s" },
177 { Opt_dirmode, "dirmode=%s" },
178 { Opt_dirmode, "dir_mode=%s" },
179 { Opt_port, "port=%s" },
180 { Opt_rsize, "rsize=%s" },
181 { Opt_wsize, "wsize=%s" },
182 { Opt_actimeo, "actimeo=%s" },
184 { Opt_blank_user, "user=" },
185 { Opt_blank_user, "username=" },
186 { Opt_user, "user=%s" },
187 { Opt_user, "username=%s" },
188 { Opt_blank_pass, "pass=" },
189 { Opt_blank_pass, "password=" },
190 { Opt_pass, "pass=%s" },
191 { Opt_pass, "password=%s" },
192 { Opt_blank_ip, "ip=" },
193 { Opt_blank_ip, "addr=" },
195 { Opt_ip, "addr=%s" },
196 { Opt_unc, "unc=%s" },
197 { Opt_unc, "target=%s" },
198 { Opt_unc, "path=%s" },
199 { Opt_domain, "dom=%s" },
200 { Opt_domain, "domain=%s" },
201 { Opt_domain, "workgroup=%s" },
202 { Opt_srcaddr, "srcaddr=%s" },
203 { Opt_prefixpath, "prefixpath=%s" },
204 { Opt_iocharset, "iocharset=%s" },
205 { Opt_netbiosname, "netbiosname=%s" },
206 { Opt_servern, "servern=%s" },
207 { Opt_ver, "ver=%s" },
208 { Opt_vers, "vers=%s" },
209 { Opt_sec, "sec=%s" },
210 { Opt_cache, "cache=%s" },
212 { Opt_ignore, "cred" },
213 { Opt_ignore, "credentials" },
214 { Opt_ignore, "cred=%s" },
215 { Opt_ignore, "credentials=%s" },
216 { Opt_ignore, "guest" },
217 { Opt_ignore, "rw" },
218 { Opt_ignore, "ro" },
219 { Opt_ignore, "suid" },
220 { Opt_ignore, "nosuid" },
221 { Opt_ignore, "exec" },
222 { Opt_ignore, "noexec" },
223 { Opt_ignore, "nodev" },
224 { Opt_ignore, "noauto" },
225 { Opt_ignore, "dev" },
226 { Opt_ignore, "mand" },
227 { Opt_ignore, "nomand" },
228 { Opt_ignore, "_netdev" },
234 Opt_sec_krb5, Opt_sec_krb5i, Opt_sec_krb5p,
235 Opt_sec_ntlmsspi, Opt_sec_ntlmssp,
236 Opt_ntlm, Opt_sec_ntlmi, Opt_sec_ntlmv2,
237 Opt_sec_ntlmv2i, Opt_sec_lanman,
243 static const match_table_t cifs_secflavor_tokens = {
244 { Opt_sec_krb5, "krb5" },
245 { Opt_sec_krb5i, "krb5i" },
246 { Opt_sec_krb5p, "krb5p" },
247 { Opt_sec_ntlmsspi, "ntlmsspi" },
248 { Opt_sec_ntlmssp, "ntlmssp" },
249 { Opt_ntlm, "ntlm" },
250 { Opt_sec_ntlmi, "ntlmi" },
251 { Opt_sec_ntlmv2, "nontlm" },
252 { Opt_sec_ntlmv2, "ntlmv2" },
253 { Opt_sec_ntlmv2i, "ntlmv2i" },
254 { Opt_sec_lanman, "lanman" },
255 { Opt_sec_none, "none" },
257 { Opt_sec_err, NULL }
268 static const match_table_t cifs_cacheflavor_tokens = {
269 { Opt_cache_loose, "loose" },
270 { Opt_cache_strict, "strict" },
271 { Opt_cache_none, "none" },
272 { Opt_cache_err, NULL }
275 static const match_table_t cifs_smb_version_tokens = {
276 { Smb_1, SMB1_VERSION_STRING },
277 { Smb_20, SMB20_VERSION_STRING},
278 { Smb_21, SMB21_VERSION_STRING },
279 { Smb_30, SMB30_VERSION_STRING },
282 static int ip_connect(struct TCP_Server_Info *server);
283 static int generic_ip_connect(struct TCP_Server_Info *server);
284 static void tlink_rb_insert(struct rb_root *root, struct tcon_link *new_tlink);
285 static void cifs_prune_tlinks(struct work_struct *work);
286 static int cifs_setup_volume_info(struct smb_vol *volume_info, char *mount_data,
287 const char *devname);
290 * cifs tcp session reconnection
292 * mark tcp session as reconnecting so temporarily locked
293 * mark all smb sessions as reconnecting for tcp session
294 * reconnect tcp session
295 * wake up waiters on reconnection? - (not needed currently)
298 cifs_reconnect(struct TCP_Server_Info *server)
301 struct list_head *tmp, *tmp2;
302 struct cifs_ses *ses;
303 struct cifs_tcon *tcon;
304 struct mid_q_entry *mid_entry;
305 struct list_head retry_list;
307 spin_lock(&GlobalMid_Lock);
308 if (server->tcpStatus == CifsExiting) {
309 /* the demux thread will exit normally
310 next time through the loop */
311 spin_unlock(&GlobalMid_Lock);
314 server->tcpStatus = CifsNeedReconnect;
315 spin_unlock(&GlobalMid_Lock);
317 #ifdef CONFIG_CIFS_SMB2
318 server->max_read = 0;
321 cFYI(1, "Reconnecting tcp session");
323 /* before reconnecting the tcp session, mark the smb session (uid)
324 and the tid bad so they are not used until reconnected */
325 cFYI(1, "%s: marking sessions and tcons for reconnect", __func__);
326 spin_lock(&cifs_tcp_ses_lock);
327 list_for_each(tmp, &server->smb_ses_list) {
328 ses = list_entry(tmp, struct cifs_ses, smb_ses_list);
329 ses->need_reconnect = true;
331 list_for_each(tmp2, &ses->tcon_list) {
332 tcon = list_entry(tmp2, struct cifs_tcon, tcon_list);
333 tcon->need_reconnect = true;
336 spin_unlock(&cifs_tcp_ses_lock);
338 /* do not want to be sending data on a socket we are freeing */
339 cFYI(1, "%s: tearing down socket", __func__);
340 mutex_lock(&server->srv_mutex);
341 if (server->ssocket) {
342 cFYI(1, "State: 0x%x Flags: 0x%lx", server->ssocket->state,
343 server->ssocket->flags);
344 kernel_sock_shutdown(server->ssocket, SHUT_WR);
345 cFYI(1, "Post shutdown state: 0x%x Flags: 0x%lx",
346 server->ssocket->state,
347 server->ssocket->flags);
348 sock_release(server->ssocket);
349 server->ssocket = NULL;
351 server->sequence_number = 0;
352 server->session_estab = false;
353 kfree(server->session_key.response);
354 server->session_key.response = NULL;
355 server->session_key.len = 0;
356 server->lstrp = jiffies;
357 mutex_unlock(&server->srv_mutex);
359 /* mark submitted MIDs for retry and issue callback */
360 INIT_LIST_HEAD(&retry_list);
361 cFYI(1, "%s: moving mids to private list", __func__);
362 spin_lock(&GlobalMid_Lock);
363 list_for_each_safe(tmp, tmp2, &server->pending_mid_q) {
364 mid_entry = list_entry(tmp, struct mid_q_entry, qhead);
365 if (mid_entry->mid_state == MID_REQUEST_SUBMITTED)
366 mid_entry->mid_state = MID_RETRY_NEEDED;
367 list_move(&mid_entry->qhead, &retry_list);
369 spin_unlock(&GlobalMid_Lock);
371 cFYI(1, "%s: issuing mid callbacks", __func__);
372 list_for_each_safe(tmp, tmp2, &retry_list) {
373 mid_entry = list_entry(tmp, struct mid_q_entry, qhead);
374 list_del_init(&mid_entry->qhead);
375 mid_entry->callback(mid_entry);
381 /* we should try only the port we connected to before */
382 rc = generic_ip_connect(server);
384 cFYI(1, "reconnect error %d", rc);
387 atomic_inc(&tcpSesReconnectCount);
388 spin_lock(&GlobalMid_Lock);
389 if (server->tcpStatus != CifsExiting)
390 server->tcpStatus = CifsNeedNegotiate;
391 spin_unlock(&GlobalMid_Lock);
393 } while (server->tcpStatus == CifsNeedReconnect);
399 cifs_echo_request(struct work_struct *work)
402 struct TCP_Server_Info *server = container_of(work,
403 struct TCP_Server_Info, echo.work);
406 * We cannot send an echo if it is disabled or until the
407 * NEGOTIATE_PROTOCOL request is done, which is indicated by
408 * server->ops->need_neg() == true. Also, no need to ping if
409 * we got a response recently.
411 if (!server->ops->need_neg || server->ops->need_neg(server) ||
412 (server->ops->can_echo && !server->ops->can_echo(server)) ||
413 time_before(jiffies, server->lstrp + SMB_ECHO_INTERVAL - HZ))
416 rc = server->ops->echo ? server->ops->echo(server) : -ENOSYS;
418 cFYI(1, "Unable to send echo request to server: %s",
422 queue_delayed_work(cifsiod_wq, &server->echo, SMB_ECHO_INTERVAL);
426 allocate_buffers(struct TCP_Server_Info *server)
428 if (!server->bigbuf) {
429 server->bigbuf = (char *)cifs_buf_get();
430 if (!server->bigbuf) {
431 cERROR(1, "No memory for large SMB response");
433 /* retry will check if exiting */
436 } else if (server->large_buf) {
437 /* we are reusing a dirty large buf, clear its start */
438 memset(server->bigbuf, 0, HEADER_SIZE(server));
441 if (!server->smallbuf) {
442 server->smallbuf = (char *)cifs_small_buf_get();
443 if (!server->smallbuf) {
444 cERROR(1, "No memory for SMB response");
446 /* retry will check if exiting */
449 /* beginning of smb buffer is cleared in our buf_get */
451 /* if existing small buf clear beginning */
452 memset(server->smallbuf, 0, HEADER_SIZE(server));
459 server_unresponsive(struct TCP_Server_Info *server)
462 * We need to wait 2 echo intervals to make sure we handle such
464 * 1s client sends a normal SMB request
465 * 2s client gets a response
466 * 30s echo workqueue job pops, and decides we got a response recently
467 * and don't need to send another
469 * 65s kernel_recvmsg times out, and we see that we haven't gotten
470 * a response in >60s.
472 if (server->tcpStatus == CifsGood &&
473 time_after(jiffies, server->lstrp + 2 * SMB_ECHO_INTERVAL)) {
474 cERROR(1, "Server %s has not responded in %d seconds. "
475 "Reconnecting...", server->hostname,
476 (2 * SMB_ECHO_INTERVAL) / HZ);
477 cifs_reconnect(server);
478 wake_up(&server->response_q);
486 * kvec_array_init - clone a kvec array, and advance into it
487 * @new: pointer to memory for cloned array
488 * @iov: pointer to original array
489 * @nr_segs: number of members in original array
490 * @bytes: number of bytes to advance into the cloned array
492 * This function will copy the array provided in iov to a section of memory
493 * and advance the specified number of bytes into the new array. It returns
494 * the number of segments in the new array. "new" must be at least as big as
495 * the original iov array.
498 kvec_array_init(struct kvec *new, struct kvec *iov, unsigned int nr_segs,
503 while (bytes || !iov->iov_len) {
504 int copy = min(bytes, iov->iov_len);
508 if (iov->iov_len == base) {
514 memcpy(new, iov, sizeof(*iov) * nr_segs);
515 new->iov_base += base;
516 new->iov_len -= base;
521 get_server_iovec(struct TCP_Server_Info *server, unsigned int nr_segs)
523 struct kvec *new_iov;
525 if (server->iov && nr_segs <= server->nr_iov)
528 /* not big enough -- allocate a new one and release the old */
529 new_iov = kmalloc(sizeof(*new_iov) * nr_segs, GFP_NOFS);
532 server->iov = new_iov;
533 server->nr_iov = nr_segs;
539 cifs_readv_from_socket(struct TCP_Server_Info *server, struct kvec *iov_orig,
540 unsigned int nr_segs, unsigned int to_read)
545 struct msghdr smb_msg;
548 iov = get_server_iovec(server, nr_segs);
552 smb_msg.msg_control = NULL;
553 smb_msg.msg_controllen = 0;
555 for (total_read = 0; to_read; total_read += length, to_read -= length) {
558 if (server_unresponsive(server)) {
559 total_read = -EAGAIN;
563 segs = kvec_array_init(iov, iov_orig, nr_segs, total_read);
565 length = kernel_recvmsg(server->ssocket, &smb_msg,
566 iov, segs, to_read, 0);
568 if (server->tcpStatus == CifsExiting) {
569 total_read = -ESHUTDOWN;
571 } else if (server->tcpStatus == CifsNeedReconnect) {
572 cifs_reconnect(server);
573 total_read = -EAGAIN;
575 } else if (length == -ERESTARTSYS ||
579 * Minimum sleep to prevent looping, allowing socket
580 * to clear and app threads to set tcpStatus
581 * CifsNeedReconnect if server hung.
583 usleep_range(1000, 2000);
586 } else if (length <= 0) {
587 cFYI(1, "Received no data or error: expecting %d "
588 "got %d", to_read, length);
589 cifs_reconnect(server);
590 total_read = -EAGAIN;
598 cifs_read_from_socket(struct TCP_Server_Info *server, char *buf,
599 unsigned int to_read)
604 iov.iov_len = to_read;
606 return cifs_readv_from_socket(server, &iov, 1, to_read);
610 is_smb_response(struct TCP_Server_Info *server, unsigned char type)
613 * The first byte big endian of the length field,
614 * is actually not part of the length but the type
615 * with the most common, zero, as regular data.
618 case RFC1002_SESSION_MESSAGE:
619 /* Regular SMB response */
621 case RFC1002_SESSION_KEEP_ALIVE:
622 cFYI(1, "RFC 1002 session keep alive");
624 case RFC1002_POSITIVE_SESSION_RESPONSE:
625 cFYI(1, "RFC 1002 positive session response");
627 case RFC1002_NEGATIVE_SESSION_RESPONSE:
629 * We get this from Windows 98 instead of an error on
630 * SMB negprot response.
632 cFYI(1, "RFC 1002 negative session response");
633 /* give server a second to clean up */
636 * Always try 445 first on reconnect since we get NACK
637 * on some if we ever connected to port 139 (the NACK
638 * is since we do not begin with RFC1001 session
641 cifs_set_port((struct sockaddr *)&server->dstaddr, CIFS_PORT);
642 cifs_reconnect(server);
643 wake_up(&server->response_q);
646 cERROR(1, "RFC 1002 unknown response type 0x%x", type);
647 cifs_reconnect(server);
654 dequeue_mid(struct mid_q_entry *mid, bool malformed)
656 #ifdef CONFIG_CIFS_STATS2
657 mid->when_received = jiffies;
659 spin_lock(&GlobalMid_Lock);
661 mid->mid_state = MID_RESPONSE_RECEIVED;
663 mid->mid_state = MID_RESPONSE_MALFORMED;
664 list_del_init(&mid->qhead);
665 spin_unlock(&GlobalMid_Lock);
669 handle_mid(struct mid_q_entry *mid, struct TCP_Server_Info *server,
670 char *buf, int malformed)
672 if (server->ops->check_trans2 &&
673 server->ops->check_trans2(mid, server, buf, malformed))
676 mid->large_buf = server->large_buf;
677 /* Was previous buf put in mpx struct for multi-rsp? */
678 if (!mid->multiRsp) {
679 /* smb buffer will be freed by user thread */
680 if (server->large_buf)
681 server->bigbuf = NULL;
683 server->smallbuf = NULL;
685 dequeue_mid(mid, malformed);
688 static void clean_demultiplex_info(struct TCP_Server_Info *server)
692 /* take it off the list, if it's not already */
693 spin_lock(&cifs_tcp_ses_lock);
694 list_del_init(&server->tcp_ses_list);
695 spin_unlock(&cifs_tcp_ses_lock);
697 spin_lock(&GlobalMid_Lock);
698 server->tcpStatus = CifsExiting;
699 spin_unlock(&GlobalMid_Lock);
700 wake_up_all(&server->response_q);
702 /* check if we have blocked requests that need to free */
703 spin_lock(&server->req_lock);
704 if (server->credits <= 0)
706 spin_unlock(&server->req_lock);
708 * Although there should not be any requests blocked on this queue it
709 * can not hurt to be paranoid and try to wake up requests that may
710 * haven been blocked when more than 50 at time were on the wire to the
711 * same server - they now will see the session is in exit state and get
712 * out of SendReceive.
714 wake_up_all(&server->request_q);
715 /* give those requests time to exit */
718 if (server->ssocket) {
719 sock_release(server->ssocket);
720 server->ssocket = NULL;
723 if (!list_empty(&server->pending_mid_q)) {
724 struct list_head dispose_list;
725 struct mid_q_entry *mid_entry;
726 struct list_head *tmp, *tmp2;
728 INIT_LIST_HEAD(&dispose_list);
729 spin_lock(&GlobalMid_Lock);
730 list_for_each_safe(tmp, tmp2, &server->pending_mid_q) {
731 mid_entry = list_entry(tmp, struct mid_q_entry, qhead);
732 cFYI(1, "Clearing mid 0x%llx", mid_entry->mid);
733 mid_entry->mid_state = MID_SHUTDOWN;
734 list_move(&mid_entry->qhead, &dispose_list);
736 spin_unlock(&GlobalMid_Lock);
738 /* now walk dispose list and issue callbacks */
739 list_for_each_safe(tmp, tmp2, &dispose_list) {
740 mid_entry = list_entry(tmp, struct mid_q_entry, qhead);
741 cFYI(1, "Callback mid 0x%llx", mid_entry->mid);
742 list_del_init(&mid_entry->qhead);
743 mid_entry->callback(mid_entry);
745 /* 1/8th of sec is more than enough time for them to exit */
749 if (!list_empty(&server->pending_mid_q)) {
751 * mpx threads have not exited yet give them at least the smb
752 * send timeout time for long ops.
754 * Due to delays on oplock break requests, we need to wait at
755 * least 45 seconds before giving up on a request getting a
756 * response and going ahead and killing cifsd.
758 cFYI(1, "Wait for exit from demultiplex thread");
761 * If threads still have not exited they are probably never
762 * coming home not much else we can do but free the memory.
766 kfree(server->hostname);
770 length = atomic_dec_return(&tcpSesAllocCount);
772 mempool_resize(cifs_req_poolp, length + cifs_min_rcv,
777 standard_receive3(struct TCP_Server_Info *server, struct mid_q_entry *mid)
780 char *buf = server->smallbuf;
781 unsigned int pdu_length = get_rfc1002_length(buf);
783 /* make sure this will fit in a large buffer */
784 if (pdu_length > CIFSMaxBufSize + MAX_HEADER_SIZE(server) - 4) {
785 cERROR(1, "SMB response too long (%u bytes)",
787 cifs_reconnect(server);
788 wake_up(&server->response_q);
792 /* switch to large buffer if too big for a small one */
793 if (pdu_length > MAX_CIFS_SMALL_BUFFER_SIZE - 4) {
794 server->large_buf = true;
795 memcpy(server->bigbuf, buf, server->total_read);
796 buf = server->bigbuf;
799 /* now read the rest */
800 length = cifs_read_from_socket(server, buf + HEADER_SIZE(server) - 1,
801 pdu_length - HEADER_SIZE(server) + 1 + 4);
804 server->total_read += length;
806 dump_smb(buf, server->total_read);
809 * We know that we received enough to get to the MID as we
810 * checked the pdu_length earlier. Now check to see
811 * if the rest of the header is OK. We borrow the length
812 * var for the rest of the loop to avoid a new stack var.
814 * 48 bytes is enough to display the header and a little bit
815 * into the payload for debugging purposes.
817 length = server->ops->check_message(buf, server->total_read);
819 cifs_dump_mem("Bad SMB: ", buf,
820 min_t(unsigned int, server->total_read, 48));
822 if (server->ops->is_status_pending &&
823 server->ops->is_status_pending(buf, server, length))
829 handle_mid(mid, server, buf, length);
834 cifs_demultiplex_thread(void *p)
837 struct TCP_Server_Info *server = p;
838 unsigned int pdu_length;
840 struct task_struct *task_to_wake = NULL;
841 struct mid_q_entry *mid_entry;
843 current->flags |= PF_MEMALLOC;
844 cFYI(1, "Demultiplex PID: %d", task_pid_nr(current));
846 length = atomic_inc_return(&tcpSesAllocCount);
848 mempool_resize(cifs_req_poolp, length + cifs_min_rcv,
852 while (server->tcpStatus != CifsExiting) {
856 if (!allocate_buffers(server))
859 server->large_buf = false;
860 buf = server->smallbuf;
861 pdu_length = 4; /* enough to get RFC1001 header */
863 length = cifs_read_from_socket(server, buf, pdu_length);
866 server->total_read = length;
869 * The right amount was read from socket - 4 bytes,
870 * so we can now interpret the length field.
872 pdu_length = get_rfc1002_length(buf);
874 cFYI(1, "RFC1002 header 0x%x", pdu_length);
875 if (!is_smb_response(server, buf[0]))
878 /* make sure we have enough to get to the MID */
879 if (pdu_length < HEADER_SIZE(server) - 1 - 4) {
880 cERROR(1, "SMB response too short (%u bytes)",
882 cifs_reconnect(server);
883 wake_up(&server->response_q);
887 /* read down to the MID */
888 length = cifs_read_from_socket(server, buf + 4,
889 HEADER_SIZE(server) - 1 - 4);
892 server->total_read += length;
894 mid_entry = server->ops->find_mid(server, buf);
896 if (!mid_entry || !mid_entry->receive)
897 length = standard_receive3(server, mid_entry);
899 length = mid_entry->receive(server, mid_entry);
904 if (server->large_buf)
905 buf = server->bigbuf;
907 server->lstrp = jiffies;
908 if (mid_entry != NULL) {
909 if (!mid_entry->multiRsp || mid_entry->multiEnd)
910 mid_entry->callback(mid_entry);
911 } else if (!server->ops->is_oplock_break ||
912 !server->ops->is_oplock_break(buf, server)) {
913 cERROR(1, "No task to wake, unknown frame received! "
914 "NumMids %d", atomic_read(&midCount));
915 cifs_dump_mem("Received Data is: ", buf,
916 HEADER_SIZE(server));
917 #ifdef CONFIG_CIFS_DEBUG2
918 if (server->ops->dump_detail)
919 server->ops->dump_detail(buf);
920 cifs_dump_mids(server);
921 #endif /* CIFS_DEBUG2 */
924 } /* end while !EXITING */
926 /* buffer usually freed in free_mid - need to free it here on exit */
927 cifs_buf_release(server->bigbuf);
928 if (server->smallbuf) /* no sense logging a debug message if NULL */
929 cifs_small_buf_release(server->smallbuf);
931 task_to_wake = xchg(&server->tsk, NULL);
932 clean_demultiplex_info(server);
934 /* if server->tsk was NULL then wait for a signal before exiting */
936 set_current_state(TASK_INTERRUPTIBLE);
937 while (!signal_pending(current)) {
939 set_current_state(TASK_INTERRUPTIBLE);
941 set_current_state(TASK_RUNNING);
944 module_put_and_exit(0);
947 /* extract the host portion of the UNC string */
949 extract_hostname(const char *unc)
955 /* skip double chars at beginning of string */
956 /* BB: check validity of these bytes? */
959 /* delimiter between hostname and sharename is always '\\' now */
960 delim = strchr(src, '\\');
962 return ERR_PTR(-EINVAL);
965 dst = kmalloc((len + 1), GFP_KERNEL);
967 return ERR_PTR(-ENOMEM);
969 memcpy(dst, src, len);
975 static int get_option_ul(substring_t args[], unsigned long *option)
980 string = match_strdup(args);
983 rc = kstrtoul(string, 0, option);
989 static int get_option_uid(substring_t args[], kuid_t *result)
995 rc = get_option_ul(args, &value);
999 uid = make_kuid(current_user_ns(), value);
1000 if (!uid_valid(uid))
1007 static int get_option_gid(substring_t args[], kgid_t *result)
1009 unsigned long value;
1013 rc = get_option_ul(args, &value);
1017 gid = make_kgid(current_user_ns(), value);
1018 if (!gid_valid(gid))
1025 static int cifs_parse_security_flavors(char *value,
1026 struct smb_vol *vol)
1029 substring_t args[MAX_OPT_ARGS];
1031 switch (match_token(value, cifs_secflavor_tokens, args)) {
1033 vol->secFlg |= CIFSSEC_MAY_KRB5 | CIFSSEC_MAY_SIGN;
1036 vol->secFlg |= CIFSSEC_MAY_KRB5 | CIFSSEC_MUST_SIGN;
1039 /* vol->secFlg |= CIFSSEC_MUST_SEAL | CIFSSEC_MAY_KRB5; */
1040 cERROR(1, "Krb5 cifs privacy not supported");
1042 case Opt_sec_ntlmssp:
1043 vol->secFlg |= CIFSSEC_MAY_NTLMSSP;
1045 case Opt_sec_ntlmsspi:
1046 vol->secFlg |= CIFSSEC_MAY_NTLMSSP | CIFSSEC_MUST_SIGN;
1049 /* ntlm is default so can be turned off too */
1050 vol->secFlg |= CIFSSEC_MAY_NTLM;
1053 vol->secFlg |= CIFSSEC_MAY_NTLM | CIFSSEC_MUST_SIGN;
1055 case Opt_sec_ntlmv2:
1056 vol->secFlg |= CIFSSEC_MAY_NTLMV2;
1058 case Opt_sec_ntlmv2i:
1059 vol->secFlg |= CIFSSEC_MAY_NTLMV2 | CIFSSEC_MUST_SIGN;
1061 #ifdef CONFIG_CIFS_WEAK_PW_HASH
1062 case Opt_sec_lanman:
1063 vol->secFlg |= CIFSSEC_MAY_LANMAN;
1070 cERROR(1, "bad security option: %s", value);
1078 cifs_parse_cache_flavor(char *value, struct smb_vol *vol)
1080 substring_t args[MAX_OPT_ARGS];
1082 switch (match_token(value, cifs_cacheflavor_tokens, args)) {
1083 case Opt_cache_loose:
1084 vol->direct_io = false;
1085 vol->strict_io = false;
1087 case Opt_cache_strict:
1088 vol->direct_io = false;
1089 vol->strict_io = true;
1091 case Opt_cache_none:
1092 vol->direct_io = true;
1093 vol->strict_io = false;
1096 cERROR(1, "bad cache= option: %s", value);
1103 cifs_parse_smb_version(char *value, struct smb_vol *vol)
1105 substring_t args[MAX_OPT_ARGS];
1107 switch (match_token(value, cifs_smb_version_tokens, args)) {
1109 vol->ops = &smb1_operations;
1110 vol->vals = &smb1_values;
1112 #ifdef CONFIG_CIFS_SMB2
1114 vol->ops = &smb21_operations; /* currently identical with 2.1 */
1115 vol->vals = &smb20_values;
1118 vol->ops = &smb21_operations;
1119 vol->vals = &smb21_values;
1122 vol->ops = &smb30_operations;
1123 vol->vals = &smb30_values;
1127 cERROR(1, "Unknown vers= option specified: %s", value);
1134 * Parse a devname into substrings and populate the vol->UNC and vol->prepath
1135 * fields with the result. Returns 0 on success and an error otherwise.
1138 cifs_parse_devname(const char *devname, struct smb_vol *vol)
1141 const char *delims = "/\\";
1144 /* make sure we have a valid UNC double delimiter prefix */
1145 len = strspn(devname, delims);
1149 /* find delimiter between host and sharename */
1150 pos = strpbrk(devname + 2, delims);
1154 /* skip past delimiter */
1157 /* now go until next delimiter or end of string */
1158 len = strcspn(pos, delims);
1160 /* move "pos" up to delimiter or NULL */
1162 vol->UNC = kstrndup(devname, pos - devname, GFP_KERNEL);
1166 convert_delimiter(vol->UNC, '\\');
1168 /* If pos is NULL, or is a bogus trailing delimiter then no prepath */
1169 if (!*pos++ || !*pos)
1172 vol->prepath = kstrdup(pos, GFP_KERNEL);
1180 cifs_parse_mount_options(const char *mountdata, const char *devname,
1181 struct smb_vol *vol)
1184 char *mountdata_copy = NULL, *options;
1185 unsigned int temp_len, i, j;
1187 short int override_uid = -1;
1188 short int override_gid = -1;
1189 bool uid_specified = false;
1190 bool gid_specified = false;
1191 bool sloppy = false;
1192 char *invalid = NULL;
1193 char *nodename = utsname()->nodename;
1194 char *string = NULL;
1195 char *tmp_end, *value;
1197 bool got_ip = false;
1198 unsigned short port = 0;
1199 struct sockaddr *dstaddr = (struct sockaddr *)&vol->dstaddr;
1203 delim = separator[0];
1205 /* ensure we always start with zeroed-out smb_vol */
1206 memset(vol, 0, sizeof(*vol));
1209 * does not have to be perfect mapping since field is
1210 * informational, only used for servers that do not support
1211 * port 445 and it can be overridden at mount time
1213 memset(vol->source_rfc1001_name, 0x20, RFC1001_NAME_LEN);
1214 for (i = 0; i < strnlen(nodename, RFC1001_NAME_LEN); i++)
1215 vol->source_rfc1001_name[i] = toupper(nodename[i]);
1217 vol->source_rfc1001_name[RFC1001_NAME_LEN] = 0;
1218 /* null target name indicates to use *SMBSERVR default called name
1219 if we end up sending RFC1001 session initialize */
1220 vol->target_rfc1001_name[0] = 0;
1221 vol->cred_uid = current_uid();
1222 vol->linux_uid = current_uid();
1223 vol->linux_gid = current_gid();
1225 /* default to only allowing write access to owner of the mount */
1226 vol->dir_mode = vol->file_mode = S_IRUGO | S_IXUGO | S_IWUSR;
1228 /* vol->retry default is 0 (i.e. "soft" limited retry not hard retry) */
1229 /* default is always to request posix paths. */
1230 vol->posix_paths = 1;
1231 /* default to using server inode numbers where available */
1232 vol->server_ino = 1;
1234 /* default is to use strict cifs caching semantics */
1235 vol->strict_io = true;
1237 vol->actimeo = CIFS_DEF_ACTIMEO;
1239 /* FIXME: add autonegotiation -- for now, SMB1 is default */
1240 vol->ops = &smb1_operations;
1241 vol->vals = &smb1_values;
1244 goto cifs_parse_mount_err;
1246 mountdata_copy = kstrndup(mountdata, PAGE_SIZE, GFP_KERNEL);
1247 if (!mountdata_copy)
1248 goto cifs_parse_mount_err;
1250 options = mountdata_copy;
1251 end = options + strlen(options);
1253 if (strncmp(options, "sep=", 4) == 0) {
1254 if (options[4] != 0) {
1255 separator[0] = options[4];
1258 cFYI(1, "Null separator not allowed");
1261 vol->backupuid_specified = false; /* no backup intent for a user */
1262 vol->backupgid_specified = false; /* no backup intent for a group */
1265 * For now, we ignore -EINVAL errors under the assumption that the
1266 * unc= and prefixpath= options will be usable.
1268 if (cifs_parse_devname(devname, vol) == -ENOMEM) {
1269 printk(KERN_ERR "CIFS: Unable to allocate memory to parse "
1270 "device string.\n");
1274 while ((data = strsep(&options, separator)) != NULL) {
1275 substring_t args[MAX_OPT_ARGS];
1276 unsigned long option;
1282 token = match_token(data, cifs_mount_option_tokens, args);
1286 /* Ingnore the following */
1290 /* Boolean values */
1291 case Opt_user_xattr:
1294 case Opt_nouser_xattr:
1300 case Opt_noforceuid:
1306 case Opt_noforcegid:
1309 case Opt_noblocksend:
1310 vol->noblocksnd = 1;
1312 case Opt_noautotune:
1313 vol->noautotune = 1;
1330 case Opt_nomapchars:
1342 case Opt_posixpaths:
1343 vol->posix_paths = 1;
1345 case Opt_noposixpaths:
1346 vol->posix_paths = 0;
1349 vol->no_linux_ext = 1;
1360 * turn off mandatory locking in mode
1361 * if remote locking is turned off since the
1362 * local vfs will do advisory
1364 if (vol->file_mode ==
1365 (S_IALLUGO & ~(S_ISUID | S_IXGRP)))
1366 vol->file_mode = S_IALLUGO;
1368 case Opt_forcemandatorylock:
1378 vol->dynperm = true;
1381 vol->dynperm = false;
1395 case Opt_nostrictsync:
1396 vol->nostrictsync = 1;
1398 case Opt_strictsync:
1399 vol->nostrictsync = 0;
1402 vol->server_ino = 1;
1404 case Opt_noserverino:
1405 vol->server_ino = 0;
1407 case Opt_rwpidforward:
1408 vol->rwpidforward = 1;
1417 vol->no_psx_acl = 0;
1420 vol->no_psx_acl = 1;
1422 case Opt_locallease:
1423 vol->local_lease = 1;
1426 vol->secFlg |= CIFSSEC_MUST_SIGN;
1429 /* we do not do the following in secFlags because seal
1430 * is a per tree connection (mount) not a per socket
1431 * or per-smb connection option in the protocol
1432 * vol->secFlg |= CIFSSEC_MUST_SEAL;
1437 printk(KERN_WARNING "CIFS: Mount option noac not "
1438 "supported. Instead set "
1439 "/proc/fs/cifs/LookupCacheEnabled to 0\n");
1442 #ifndef CONFIG_CIFS_FSCACHE
1443 cERROR(1, "FS-Cache support needs CONFIG_CIFS_FSCACHE "
1444 "kernel config option set");
1445 goto cifs_parse_mount_err;
1449 case Opt_mfsymlinks:
1450 vol->mfsymlinks = true;
1453 vol->multiuser = true;
1459 /* Numeric Values */
1461 if (get_option_uid(args, &vol->backupuid)) {
1462 cERROR(1, "%s: Invalid backupuid value",
1464 goto cifs_parse_mount_err;
1466 vol->backupuid_specified = true;
1469 if (get_option_gid(args, &vol->backupgid)) {
1470 cERROR(1, "%s: Invalid backupgid value",
1472 goto cifs_parse_mount_err;
1474 vol->backupgid_specified = true;
1477 if (get_option_uid(args, &vol->linux_uid)) {
1478 cERROR(1, "%s: Invalid uid value",
1480 goto cifs_parse_mount_err;
1482 uid_specified = true;
1485 if (get_option_uid(args, &vol->cred_uid)) {
1486 cERROR(1, "%s: Invalid cruid value",
1488 goto cifs_parse_mount_err;
1492 if (get_option_gid(args, &vol->linux_gid)) {
1493 cERROR(1, "%s: Invalid gid value",
1495 goto cifs_parse_mount_err;
1497 gid_specified = true;
1500 if (get_option_ul(args, &option)) {
1501 cERROR(1, "%s: Invalid file_mode value",
1503 goto cifs_parse_mount_err;
1505 vol->file_mode = option;
1508 if (get_option_ul(args, &option)) {
1509 cERROR(1, "%s: Invalid dir_mode value",
1511 goto cifs_parse_mount_err;
1513 vol->dir_mode = option;
1516 if (get_option_ul(args, &option) ||
1517 option > USHRT_MAX) {
1518 cERROR(1, "%s: Invalid port value", __func__);
1519 goto cifs_parse_mount_err;
1521 port = (unsigned short)option;
1524 if (get_option_ul(args, &option)) {
1525 cERROR(1, "%s: Invalid rsize value",
1527 goto cifs_parse_mount_err;
1529 vol->rsize = option;
1532 if (get_option_ul(args, &option)) {
1533 cERROR(1, "%s: Invalid wsize value",
1535 goto cifs_parse_mount_err;
1537 vol->wsize = option;
1540 if (get_option_ul(args, &option)) {
1541 cERROR(1, "%s: Invalid actimeo value",
1543 goto cifs_parse_mount_err;
1545 vol->actimeo = HZ * option;
1546 if (vol->actimeo > CIFS_MAX_ACTIMEO) {
1547 cERROR(1, "CIFS: attribute cache"
1548 "timeout too large");
1549 goto cifs_parse_mount_err;
1553 /* String Arguments */
1555 case Opt_blank_user:
1556 /* null user, ie. anonymous authentication */
1558 vol->username = NULL;
1561 string = match_strdup(args);
1565 if (strnlen(string, MAX_USERNAME_SIZE) >
1566 MAX_USERNAME_SIZE) {
1567 printk(KERN_WARNING "CIFS: username too long\n");
1568 goto cifs_parse_mount_err;
1570 vol->username = kstrdup(string, GFP_KERNEL);
1571 if (!vol->username) {
1572 printk(KERN_WARNING "CIFS: no memory "
1574 goto cifs_parse_mount_err;
1577 case Opt_blank_pass:
1578 /* passwords have to be handled differently
1579 * to allow the character used for deliminator
1580 * to be passed within them
1584 * Check if this is a case where the password
1585 * starts with a delimiter
1587 tmp_end = strchr(data, '=');
1589 if (!(tmp_end < end && tmp_end[1] == delim)) {
1590 /* No it is not. Set the password to NULL */
1591 vol->password = NULL;
1594 /* Yes it is. Drop down to Opt_pass below.*/
1596 /* Obtain the value string */
1597 value = strchr(data, '=');
1600 /* Set tmp_end to end of the string */
1601 tmp_end = (char *) value + strlen(value);
1603 /* Check if following character is the deliminator
1604 * If yes, we have encountered a double deliminator
1605 * reset the NULL character to the deliminator
1607 if (tmp_end < end && tmp_end[1] == delim) {
1610 /* Keep iterating until we get to a single
1611 * deliminator OR the end
1613 while ((tmp_end = strchr(tmp_end, delim))
1614 != NULL && (tmp_end[1] == delim)) {
1615 tmp_end = (char *) &tmp_end[2];
1618 /* Reset var options to point to next element */
1621 options = (char *) &tmp_end[1];
1623 /* Reached the end of the mount option
1628 /* Now build new password string */
1629 temp_len = strlen(value);
1630 vol->password = kzalloc(temp_len+1, GFP_KERNEL);
1631 if (vol->password == NULL) {
1632 printk(KERN_WARNING "CIFS: no memory "
1634 goto cifs_parse_mount_err;
1637 for (i = 0, j = 0; i < temp_len; i++, j++) {
1638 vol->password[j] = value[i];
1639 if ((value[i] == delim) &&
1640 value[i+1] == delim)
1641 /* skip the second deliminator */
1644 vol->password[j] = '\0';
1647 /* FIXME: should this be an error instead? */
1651 string = match_strdup(args);
1655 if (!cifs_convert_address(dstaddr, string,
1657 printk(KERN_ERR "CIFS: bad ip= option (%s).\n",
1659 goto cifs_parse_mount_err;
1665 vol->UNC = match_strdup(args);
1666 if (vol->UNC == NULL)
1669 convert_delimiter(vol->UNC, '\\');
1670 if (vol->UNC[0] != '\\' || vol->UNC[1] != '\\') {
1671 printk(KERN_ERR "CIFS: UNC Path does not "
1672 "begin with // or \\\\\n");
1673 goto cifs_parse_mount_err;
1676 /* Compare old unc= option to new one */
1677 if (!string || strcmp(string, vol->UNC))
1678 printk(KERN_WARNING "CIFS: the value of the "
1679 "unc= mount option does not match the "
1680 "device string. Using the unc= option "
1681 "for now. In 3.10, that option will "
1682 "be ignored and the contents of the "
1683 "device string will be used "
1684 "instead. (%s != %s)\n", string,
1688 string = match_strdup(args);
1692 if (strnlen(string, 256) == 256) {
1693 printk(KERN_WARNING "CIFS: domain name too"
1695 goto cifs_parse_mount_err;
1698 vol->domainname = kstrdup(string, GFP_KERNEL);
1699 if (!vol->domainname) {
1700 printk(KERN_WARNING "CIFS: no memory "
1701 "for domainname\n");
1702 goto cifs_parse_mount_err;
1704 cFYI(1, "Domain name set");
1707 string = match_strdup(args);
1711 if (!cifs_convert_address(
1712 (struct sockaddr *)&vol->srcaddr,
1713 string, strlen(string))) {
1714 printk(KERN_WARNING "CIFS: Could not parse"
1715 " srcaddr: %s\n", string);
1716 goto cifs_parse_mount_err;
1719 case Opt_prefixpath:
1720 /* skip over any leading delimiter */
1721 if (*args[0].from == '/' || *args[0].from == '\\')
1724 string = vol->prepath;
1725 vol->prepath = match_strdup(args);
1726 if (vol->prepath == NULL)
1728 /* Compare old prefixpath= option to new one */
1729 if (!string || strcmp(string, vol->prepath))
1730 printk(KERN_WARNING "CIFS: the value of the "
1731 "prefixpath= mount option does not "
1732 "match the device string. Using the "
1733 "prefixpath= option for now. In 3.10, "
1734 "that option will be ignored and the "
1735 "contents of the device string will be "
1736 "used instead.(%s != %s)\n", string,
1740 string = match_strdup(args);
1744 if (strnlen(string, 1024) >= 65) {
1745 printk(KERN_WARNING "CIFS: iocharset name "
1747 goto cifs_parse_mount_err;
1750 if (strnicmp(string, "default", 7) != 0) {
1751 vol->iocharset = kstrdup(string,
1753 if (!vol->iocharset) {
1754 printk(KERN_WARNING "CIFS: no memory"
1756 goto cifs_parse_mount_err;
1759 /* if iocharset not set then load_nls_default
1762 cFYI(1, "iocharset set to %s", string);
1764 case Opt_netbiosname:
1765 string = match_strdup(args);
1769 memset(vol->source_rfc1001_name, 0x20,
1772 * FIXME: are there cases in which a comma can
1773 * be valid in workstation netbios name (and
1774 * need special handling)?
1776 for (i = 0; i < RFC1001_NAME_LEN; i++) {
1777 /* don't ucase netbiosname for user */
1780 vol->source_rfc1001_name[i] = string[i];
1782 /* The string has 16th byte zero still from
1783 * set at top of the function
1785 if (i == RFC1001_NAME_LEN && string[i] != 0)
1786 printk(KERN_WARNING "CIFS: netbiosname"
1787 " longer than 15 truncated.\n");
1791 /* servernetbiosname specified override *SMBSERVER */
1792 string = match_strdup(args);
1796 /* last byte, type, is 0x20 for servr type */
1797 memset(vol->target_rfc1001_name, 0x20,
1798 RFC1001_NAME_LEN_WITH_NULL);
1800 /* BB are there cases in which a comma can be
1801 valid in this workstation netbios name
1802 (and need special handling)? */
1804 /* user or mount helper must uppercase the
1806 for (i = 0; i < 15; i++) {
1809 vol->target_rfc1001_name[i] = string[i];
1811 /* The string has 16th byte zero still from
1812 set at top of the function */
1813 if (i == RFC1001_NAME_LEN && string[i] != 0)
1814 printk(KERN_WARNING "CIFS: server net"
1815 "biosname longer than 15 truncated.\n");
1818 string = match_strdup(args);
1822 if (strnicmp(string, "1", 1) == 0) {
1823 /* This is the default */
1826 /* For all other value, error */
1827 printk(KERN_WARNING "CIFS: Invalid version"
1829 goto cifs_parse_mount_err;
1831 string = match_strdup(args);
1835 if (cifs_parse_smb_version(string, vol) != 0)
1836 goto cifs_parse_mount_err;
1839 string = match_strdup(args);
1843 if (cifs_parse_security_flavors(string, vol) != 0)
1844 goto cifs_parse_mount_err;
1847 string = match_strdup(args);
1851 if (cifs_parse_cache_flavor(string, vol) != 0)
1852 goto cifs_parse_mount_err;
1856 * An option we don't recognize. Save it off for later
1857 * if we haven't already found one
1863 /* Free up any allocated string */
1868 if (!sloppy && invalid) {
1869 printk(KERN_ERR "CIFS: Unknown mount option \"%s\"\n", invalid);
1870 goto cifs_parse_mount_err;
1874 /* Muliuser mounts require CONFIG_KEYS support */
1875 if (vol->multiuser) {
1876 cERROR(1, "Multiuser mounts require kernels with "
1877 "CONFIG_KEYS enabled.");
1878 goto cifs_parse_mount_err;
1882 cERROR(1, "CIFS mount error: No usable UNC path provided in "
1883 "device string or in unc= option!");
1884 goto cifs_parse_mount_err;
1887 /* make sure UNC has a share name */
1888 if (!strchr(vol->UNC + 3, '\\')) {
1889 cERROR(1, "Malformed UNC. Unable to find share name.");
1890 goto cifs_parse_mount_err;
1894 /* No ip= option specified? Try to get it from UNC */
1895 if (!cifs_convert_address(dstaddr, &vol->UNC[2],
1896 strlen(&vol->UNC[2]))) {
1897 printk(KERN_ERR "Unable to determine destination "
1899 goto cifs_parse_mount_err;
1903 /* set the port that we got earlier */
1904 cifs_set_port(dstaddr, port);
1907 vol->override_uid = override_uid;
1908 else if (override_uid == 1)
1909 printk(KERN_NOTICE "CIFS: ignoring forceuid mount option "
1910 "specified with no uid= option.\n");
1913 vol->override_gid = override_gid;
1914 else if (override_gid == 1)
1915 printk(KERN_NOTICE "CIFS: ignoring forcegid mount option "
1916 "specified with no gid= option.\n");
1918 kfree(mountdata_copy);
1922 printk(KERN_WARNING "Could not allocate temporary buffer\n");
1923 cifs_parse_mount_err:
1925 kfree(mountdata_copy);
1929 /** Returns true if srcaddr isn't specified and rhs isn't
1930 * specified, or if srcaddr is specified and
1931 * matches the IP address of the rhs argument.
1934 srcip_matches(struct sockaddr *srcaddr, struct sockaddr *rhs)
1936 switch (srcaddr->sa_family) {
1938 return (rhs->sa_family == AF_UNSPEC);
1940 struct sockaddr_in *saddr4 = (struct sockaddr_in *)srcaddr;
1941 struct sockaddr_in *vaddr4 = (struct sockaddr_in *)rhs;
1942 return (saddr4->sin_addr.s_addr == vaddr4->sin_addr.s_addr);
1945 struct sockaddr_in6 *saddr6 = (struct sockaddr_in6 *)srcaddr;
1946 struct sockaddr_in6 *vaddr6 = (struct sockaddr_in6 *)rhs;
1947 return ipv6_addr_equal(&saddr6->sin6_addr, &vaddr6->sin6_addr);
1951 return false; /* don't expect to be here */
1956 * If no port is specified in addr structure, we try to match with 445 port
1957 * and if it fails - with 139 ports. It should be called only if address
1958 * families of server and addr are equal.
1961 match_port(struct TCP_Server_Info *server, struct sockaddr *addr)
1963 __be16 port, *sport;
1965 switch (addr->sa_family) {
1967 sport = &((struct sockaddr_in *) &server->dstaddr)->sin_port;
1968 port = ((struct sockaddr_in *) addr)->sin_port;
1971 sport = &((struct sockaddr_in6 *) &server->dstaddr)->sin6_port;
1972 port = ((struct sockaddr_in6 *) addr)->sin6_port;
1980 port = htons(CIFS_PORT);
1984 port = htons(RFC1001_PORT);
1987 return port == *sport;
1991 match_address(struct TCP_Server_Info *server, struct sockaddr *addr,
1992 struct sockaddr *srcaddr)
1994 switch (addr->sa_family) {
1996 struct sockaddr_in *addr4 = (struct sockaddr_in *)addr;
1997 struct sockaddr_in *srv_addr4 =
1998 (struct sockaddr_in *)&server->dstaddr;
2000 if (addr4->sin_addr.s_addr != srv_addr4->sin_addr.s_addr)
2005 struct sockaddr_in6 *addr6 = (struct sockaddr_in6 *)addr;
2006 struct sockaddr_in6 *srv_addr6 =
2007 (struct sockaddr_in6 *)&server->dstaddr;
2009 if (!ipv6_addr_equal(&addr6->sin6_addr,
2010 &srv_addr6->sin6_addr))
2012 if (addr6->sin6_scope_id != srv_addr6->sin6_scope_id)
2018 return false; /* don't expect to be here */
2021 if (!srcip_matches(srcaddr, (struct sockaddr *)&server->srcaddr))
2028 match_security(struct TCP_Server_Info *server, struct smb_vol *vol)
2030 unsigned int secFlags;
2032 if (vol->secFlg & (~(CIFSSEC_MUST_SIGN | CIFSSEC_MUST_SEAL)))
2033 secFlags = vol->secFlg;
2035 secFlags = global_secflags | vol->secFlg;
2037 switch (server->secType) {
2039 if (!(secFlags & (CIFSSEC_MAY_LANMAN|CIFSSEC_MAY_PLNTXT)))
2043 if (!(secFlags & CIFSSEC_MAY_NTLMV2))
2047 if (!(secFlags & CIFSSEC_MAY_NTLM))
2051 if (!(secFlags & CIFSSEC_MAY_KRB5))
2055 if (!(secFlags & CIFSSEC_MAY_NTLMSSP))
2059 /* shouldn't happen */
2063 /* now check if signing mode is acceptable */
2064 if ((secFlags & CIFSSEC_MAY_SIGN) == 0 &&
2065 (server->sec_mode & SECMODE_SIGN_REQUIRED))
2067 else if (((secFlags & CIFSSEC_MUST_SIGN) == CIFSSEC_MUST_SIGN) &&
2069 (SECMODE_SIGN_ENABLED|SECMODE_SIGN_REQUIRED)) == 0)
2075 static int match_server(struct TCP_Server_Info *server, struct smb_vol *vol)
2077 struct sockaddr *addr = (struct sockaddr *)&vol->dstaddr;
2079 if ((server->vals != vol->vals) || (server->ops != vol->ops))
2082 if (!net_eq(cifs_net_ns(server), current->nsproxy->net_ns))
2085 if (!match_address(server, addr,
2086 (struct sockaddr *)&vol->srcaddr))
2089 if (!match_port(server, addr))
2092 if (!match_security(server, vol))
2098 static struct TCP_Server_Info *
2099 cifs_find_tcp_session(struct smb_vol *vol)
2101 struct TCP_Server_Info *server;
2103 spin_lock(&cifs_tcp_ses_lock);
2104 list_for_each_entry(server, &cifs_tcp_ses_list, tcp_ses_list) {
2105 if (!match_server(server, vol))
2108 ++server->srv_count;
2109 spin_unlock(&cifs_tcp_ses_lock);
2110 cFYI(1, "Existing tcp session with server found");
2113 spin_unlock(&cifs_tcp_ses_lock);
2118 cifs_put_tcp_session(struct TCP_Server_Info *server)
2120 struct task_struct *task;
2122 spin_lock(&cifs_tcp_ses_lock);
2123 if (--server->srv_count > 0) {
2124 spin_unlock(&cifs_tcp_ses_lock);
2128 put_net(cifs_net_ns(server));
2130 list_del_init(&server->tcp_ses_list);
2131 spin_unlock(&cifs_tcp_ses_lock);
2133 cancel_delayed_work_sync(&server->echo);
2135 spin_lock(&GlobalMid_Lock);
2136 server->tcpStatus = CifsExiting;
2137 spin_unlock(&GlobalMid_Lock);
2139 cifs_crypto_shash_release(server);
2140 cifs_fscache_release_client_cookie(server);
2142 kfree(server->session_key.response);
2143 server->session_key.response = NULL;
2144 server->session_key.len = 0;
2146 task = xchg(&server->tsk, NULL);
2148 force_sig(SIGKILL, task);
2151 static struct TCP_Server_Info *
2152 cifs_get_tcp_session(struct smb_vol *volume_info)
2154 struct TCP_Server_Info *tcp_ses = NULL;
2157 cFYI(1, "UNC: %s", volume_info->UNC);
2159 /* see if we already have a matching tcp_ses */
2160 tcp_ses = cifs_find_tcp_session(volume_info);
2164 tcp_ses = kzalloc(sizeof(struct TCP_Server_Info), GFP_KERNEL);
2170 rc = cifs_crypto_shash_allocate(tcp_ses);
2172 cERROR(1, "could not setup hash structures rc %d", rc);
2176 tcp_ses->ops = volume_info->ops;
2177 tcp_ses->vals = volume_info->vals;
2178 cifs_set_net_ns(tcp_ses, get_net(current->nsproxy->net_ns));
2179 tcp_ses->hostname = extract_hostname(volume_info->UNC);
2180 if (IS_ERR(tcp_ses->hostname)) {
2181 rc = PTR_ERR(tcp_ses->hostname);
2182 goto out_err_crypto_release;
2185 tcp_ses->noblocksnd = volume_info->noblocksnd;
2186 tcp_ses->noautotune = volume_info->noautotune;
2187 tcp_ses->tcp_nodelay = volume_info->sockopt_tcp_nodelay;
2188 tcp_ses->in_flight = 0;
2189 tcp_ses->credits = 1;
2190 init_waitqueue_head(&tcp_ses->response_q);
2191 init_waitqueue_head(&tcp_ses->request_q);
2192 INIT_LIST_HEAD(&tcp_ses->pending_mid_q);
2193 mutex_init(&tcp_ses->srv_mutex);
2194 memcpy(tcp_ses->workstation_RFC1001_name,
2195 volume_info->source_rfc1001_name, RFC1001_NAME_LEN_WITH_NULL);
2196 memcpy(tcp_ses->server_RFC1001_name,
2197 volume_info->target_rfc1001_name, RFC1001_NAME_LEN_WITH_NULL);
2198 tcp_ses->session_estab = false;
2199 tcp_ses->sequence_number = 0;
2200 tcp_ses->lstrp = jiffies;
2201 spin_lock_init(&tcp_ses->req_lock);
2202 INIT_LIST_HEAD(&tcp_ses->tcp_ses_list);
2203 INIT_LIST_HEAD(&tcp_ses->smb_ses_list);
2204 INIT_DELAYED_WORK(&tcp_ses->echo, cifs_echo_request);
2205 memcpy(&tcp_ses->srcaddr, &volume_info->srcaddr,
2206 sizeof(tcp_ses->srcaddr));
2207 memcpy(&tcp_ses->dstaddr, &volume_info->dstaddr,
2208 sizeof(tcp_ses->dstaddr));
2210 * at this point we are the only ones with the pointer
2211 * to the struct since the kernel thread not created yet
2212 * no need to spinlock this init of tcpStatus or srv_count
2214 tcp_ses->tcpStatus = CifsNew;
2215 ++tcp_ses->srv_count;
2217 rc = ip_connect(tcp_ses);
2219 cERROR(1, "Error connecting to socket. Aborting operation");
2220 goto out_err_crypto_release;
2224 * since we're in a cifs function already, we know that
2225 * this will succeed. No need for try_module_get().
2227 __module_get(THIS_MODULE);
2228 tcp_ses->tsk = kthread_run(cifs_demultiplex_thread,
2230 if (IS_ERR(tcp_ses->tsk)) {
2231 rc = PTR_ERR(tcp_ses->tsk);
2232 cERROR(1, "error %d create cifsd thread", rc);
2233 module_put(THIS_MODULE);
2234 goto out_err_crypto_release;
2236 tcp_ses->tcpStatus = CifsNeedNegotiate;
2238 /* thread spawned, put it on the list */
2239 spin_lock(&cifs_tcp_ses_lock);
2240 list_add(&tcp_ses->tcp_ses_list, &cifs_tcp_ses_list);
2241 spin_unlock(&cifs_tcp_ses_lock);
2243 cifs_fscache_get_client_cookie(tcp_ses);
2245 /* queue echo request delayed work */
2246 queue_delayed_work(cifsiod_wq, &tcp_ses->echo, SMB_ECHO_INTERVAL);
2250 out_err_crypto_release:
2251 cifs_crypto_shash_release(tcp_ses);
2253 put_net(cifs_net_ns(tcp_ses));
2257 if (!IS_ERR(tcp_ses->hostname))
2258 kfree(tcp_ses->hostname);
2259 if (tcp_ses->ssocket)
2260 sock_release(tcp_ses->ssocket);
2266 static int match_session(struct cifs_ses *ses, struct smb_vol *vol)
2268 switch (ses->server->secType) {
2270 if (!uid_eq(vol->cred_uid, ses->cred_uid))
2274 /* NULL username means anonymous session */
2275 if (ses->user_name == NULL) {
2281 /* anything else takes username/password */
2282 if (strncmp(ses->user_name,
2283 vol->username ? vol->username : "",
2286 if (strlen(vol->username) != 0 &&
2287 ses->password != NULL &&
2288 strncmp(ses->password,
2289 vol->password ? vol->password : "",
2296 static struct cifs_ses *
2297 cifs_find_smb_ses(struct TCP_Server_Info *server, struct smb_vol *vol)
2299 struct cifs_ses *ses;
2301 spin_lock(&cifs_tcp_ses_lock);
2302 list_for_each_entry(ses, &server->smb_ses_list, smb_ses_list) {
2303 if (!match_session(ses, vol))
2306 spin_unlock(&cifs_tcp_ses_lock);
2309 spin_unlock(&cifs_tcp_ses_lock);
2314 cifs_put_smb_ses(struct cifs_ses *ses)
2317 struct TCP_Server_Info *server = ses->server;
2319 cFYI(1, "%s: ses_count=%d", __func__, ses->ses_count);
2320 spin_lock(&cifs_tcp_ses_lock);
2321 if (--ses->ses_count > 0) {
2322 spin_unlock(&cifs_tcp_ses_lock);
2326 list_del_init(&ses->smb_ses_list);
2327 spin_unlock(&cifs_tcp_ses_lock);
2329 if (ses->status == CifsGood && server->ops->logoff) {
2331 server->ops->logoff(xid, ses);
2335 cifs_put_tcp_session(server);
2340 /* strlen("cifs:a:") + INET6_ADDRSTRLEN + 1 */
2341 #define CIFSCREDS_DESC_SIZE (7 + INET6_ADDRSTRLEN + 1)
2343 /* Populate username and pw fields from keyring if possible */
2345 cifs_set_cifscreds(struct smb_vol *vol, struct cifs_ses *ses)
2348 char *desc, *delim, *payload;
2351 struct TCP_Server_Info *server = ses->server;
2352 struct sockaddr_in *sa;
2353 struct sockaddr_in6 *sa6;
2354 struct user_key_payload *upayload;
2356 desc = kmalloc(CIFSCREDS_DESC_SIZE, GFP_KERNEL);
2360 /* try to find an address key first */
2361 switch (server->dstaddr.ss_family) {
2363 sa = (struct sockaddr_in *)&server->dstaddr;
2364 sprintf(desc, "cifs:a:%pI4", &sa->sin_addr.s_addr);
2367 sa6 = (struct sockaddr_in6 *)&server->dstaddr;
2368 sprintf(desc, "cifs:a:%pI6c", &sa6->sin6_addr.s6_addr);
2371 cFYI(1, "Bad ss_family (%hu)", server->dstaddr.ss_family);
2376 cFYI(1, "%s: desc=%s", __func__, desc);
2377 key = request_key(&key_type_logon, desc, "");
2379 if (!ses->domainName) {
2380 cFYI(1, "domainName is NULL");
2385 /* didn't work, try to find a domain key */
2386 sprintf(desc, "cifs:d:%s", ses->domainName);
2387 cFYI(1, "%s: desc=%s", __func__, desc);
2388 key = request_key(&key_type_logon, desc, "");
2395 down_read(&key->sem);
2396 upayload = key->payload.data;
2397 if (IS_ERR_OR_NULL(upayload)) {
2398 rc = upayload ? PTR_ERR(upayload) : -EINVAL;
2402 /* find first : in payload */
2403 payload = (char *)upayload->data;
2404 delim = strnchr(payload, upayload->datalen, ':');
2405 cFYI(1, "payload=%s", payload);
2407 cFYI(1, "Unable to find ':' in payload (datalen=%d)",
2413 len = delim - payload;
2414 if (len > MAX_USERNAME_SIZE || len <= 0) {
2415 cFYI(1, "Bad value from username search (len=%zd)", len);
2420 vol->username = kstrndup(payload, len, GFP_KERNEL);
2421 if (!vol->username) {
2422 cFYI(1, "Unable to allocate %zd bytes for username", len);
2426 cFYI(1, "%s: username=%s", __func__, vol->username);
2428 len = key->datalen - (len + 1);
2429 if (len > MAX_PASSWORD_SIZE || len <= 0) {
2430 cFYI(1, "Bad len for password search (len=%zd)", len);
2432 kfree(vol->username);
2433 vol->username = NULL;
2438 vol->password = kstrndup(delim, len, GFP_KERNEL);
2439 if (!vol->password) {
2440 cFYI(1, "Unable to allocate %zd bytes for password", len);
2442 kfree(vol->username);
2443 vol->username = NULL;
2452 cFYI(1, "%s: returning %d", __func__, rc);
2455 #else /* ! CONFIG_KEYS */
2457 cifs_set_cifscreds(struct smb_vol *vol __attribute__((unused)),
2458 struct cifs_ses *ses __attribute__((unused)))
2462 #endif /* CONFIG_KEYS */
2464 static struct cifs_ses *
2465 cifs_get_smb_ses(struct TCP_Server_Info *server, struct smb_vol *volume_info)
2469 struct cifs_ses *ses;
2470 struct sockaddr_in *addr = (struct sockaddr_in *)&server->dstaddr;
2471 struct sockaddr_in6 *addr6 = (struct sockaddr_in6 *)&server->dstaddr;
2475 ses = cifs_find_smb_ses(server, volume_info);
2477 cFYI(1, "Existing smb sess found (status=%d)", ses->status);
2479 mutex_lock(&ses->session_mutex);
2480 rc = cifs_negotiate_protocol(xid, ses);
2482 mutex_unlock(&ses->session_mutex);
2483 /* problem -- put our ses reference */
2484 cifs_put_smb_ses(ses);
2488 if (ses->need_reconnect) {
2489 cFYI(1, "Session needs reconnect");
2490 rc = cifs_setup_session(xid, ses,
2491 volume_info->local_nls);
2493 mutex_unlock(&ses->session_mutex);
2494 /* problem -- put our reference */
2495 cifs_put_smb_ses(ses);
2500 mutex_unlock(&ses->session_mutex);
2502 /* existing SMB ses has a server reference already */
2503 cifs_put_tcp_session(server);
2508 cFYI(1, "Existing smb sess not found");
2509 ses = sesInfoAlloc();
2513 /* new SMB session uses our server ref */
2514 ses->server = server;
2515 if (server->dstaddr.ss_family == AF_INET6)
2516 sprintf(ses->serverName, "%pI6", &addr6->sin6_addr);
2518 sprintf(ses->serverName, "%pI4", &addr->sin_addr);
2520 if (volume_info->username) {
2521 ses->user_name = kstrdup(volume_info->username, GFP_KERNEL);
2522 if (!ses->user_name)
2526 /* volume_info->password freed at unmount */
2527 if (volume_info->password) {
2528 ses->password = kstrdup(volume_info->password, GFP_KERNEL);
2532 if (volume_info->domainname) {
2533 ses->domainName = kstrdup(volume_info->domainname, GFP_KERNEL);
2534 if (!ses->domainName)
2537 ses->cred_uid = volume_info->cred_uid;
2538 ses->linux_uid = volume_info->linux_uid;
2540 ses->overrideSecFlg = volume_info->secFlg;
2542 mutex_lock(&ses->session_mutex);
2543 rc = cifs_negotiate_protocol(xid, ses);
2545 rc = cifs_setup_session(xid, ses, volume_info->local_nls);
2546 mutex_unlock(&ses->session_mutex);
2550 /* success, put it on the list */
2551 spin_lock(&cifs_tcp_ses_lock);
2552 list_add(&ses->smb_ses_list, &server->smb_ses_list);
2553 spin_unlock(&cifs_tcp_ses_lock);
2564 static int match_tcon(struct cifs_tcon *tcon, const char *unc)
2566 if (tcon->tidStatus == CifsExiting)
2568 if (strncmp(tcon->treeName, unc, MAX_TREE_SIZE))
2573 static struct cifs_tcon *
2574 cifs_find_tcon(struct cifs_ses *ses, const char *unc)
2576 struct list_head *tmp;
2577 struct cifs_tcon *tcon;
2579 spin_lock(&cifs_tcp_ses_lock);
2580 list_for_each(tmp, &ses->tcon_list) {
2581 tcon = list_entry(tmp, struct cifs_tcon, tcon_list);
2582 if (!match_tcon(tcon, unc))
2585 spin_unlock(&cifs_tcp_ses_lock);
2588 spin_unlock(&cifs_tcp_ses_lock);
2593 cifs_put_tcon(struct cifs_tcon *tcon)
2596 struct cifs_ses *ses = tcon->ses;
2598 cFYI(1, "%s: tc_count=%d", __func__, tcon->tc_count);
2599 spin_lock(&cifs_tcp_ses_lock);
2600 if (--tcon->tc_count > 0) {
2601 spin_unlock(&cifs_tcp_ses_lock);
2605 list_del_init(&tcon->tcon_list);
2606 spin_unlock(&cifs_tcp_ses_lock);
2609 if (ses->server->ops->tree_disconnect)
2610 ses->server->ops->tree_disconnect(xid, tcon);
2613 cifs_fscache_release_super_cookie(tcon);
2615 cifs_put_smb_ses(ses);
2618 static struct cifs_tcon *
2619 cifs_get_tcon(struct cifs_ses *ses, struct smb_vol *volume_info)
2622 struct cifs_tcon *tcon;
2624 tcon = cifs_find_tcon(ses, volume_info->UNC);
2626 cFYI(1, "Found match on UNC path");
2627 /* existing tcon already has a reference */
2628 cifs_put_smb_ses(ses);
2629 if (tcon->seal != volume_info->seal)
2630 cERROR(1, "transport encryption setting "
2631 "conflicts with existing tid");
2635 if (!ses->server->ops->tree_connect) {
2640 tcon = tconInfoAlloc();
2647 if (volume_info->password) {
2648 tcon->password = kstrdup(volume_info->password, GFP_KERNEL);
2649 if (!tcon->password) {
2656 * BB Do we need to wrap session_mutex around this TCon call and Unix
2657 * SetFS as we do on SessSetup and reconnect?
2660 rc = ses->server->ops->tree_connect(xid, ses, volume_info->UNC, tcon,
2661 volume_info->local_nls);
2663 cFYI(1, "Tcon rc = %d", rc);
2667 if (volume_info->nodfs) {
2668 tcon->Flags &= ~SMB_SHARE_IS_IN_DFS;
2669 cFYI(1, "DFS disabled (%d)", tcon->Flags);
2671 tcon->seal = volume_info->seal;
2673 * We can have only one retry value for a connection to a share so for
2674 * resources mounted more than once to the same server share the last
2675 * value passed in for the retry flag is used.
2677 tcon->retry = volume_info->retry;
2678 tcon->nocase = volume_info->nocase;
2679 tcon->local_lease = volume_info->local_lease;
2680 INIT_LIST_HEAD(&tcon->pending_opens);
2682 spin_lock(&cifs_tcp_ses_lock);
2683 list_add(&tcon->tcon_list, &ses->tcon_list);
2684 spin_unlock(&cifs_tcp_ses_lock);
2686 cifs_fscache_get_super_cookie(tcon);
2696 cifs_put_tlink(struct tcon_link *tlink)
2698 if (!tlink || IS_ERR(tlink))
2701 if (!atomic_dec_and_test(&tlink->tl_count) ||
2702 test_bit(TCON_LINK_IN_TREE, &tlink->tl_flags)) {
2703 tlink->tl_time = jiffies;
2707 if (!IS_ERR(tlink_tcon(tlink)))
2708 cifs_put_tcon(tlink_tcon(tlink));
2713 static inline struct tcon_link *
2714 cifs_sb_master_tlink(struct cifs_sb_info *cifs_sb)
2716 return cifs_sb->master_tlink;
2720 compare_mount_options(struct super_block *sb, struct cifs_mnt_data *mnt_data)
2722 struct cifs_sb_info *old = CIFS_SB(sb);
2723 struct cifs_sb_info *new = mnt_data->cifs_sb;
2725 if ((sb->s_flags & CIFS_MS_MASK) != (mnt_data->flags & CIFS_MS_MASK))
2728 if ((old->mnt_cifs_flags & CIFS_MOUNT_MASK) !=
2729 (new->mnt_cifs_flags & CIFS_MOUNT_MASK))
2733 * We want to share sb only if we don't specify an r/wsize or
2734 * specified r/wsize is greater than or equal to existing one.
2736 if (new->wsize && new->wsize < old->wsize)
2739 if (new->rsize && new->rsize < old->rsize)
2742 if (!uid_eq(old->mnt_uid, new->mnt_uid) || !gid_eq(old->mnt_gid, new->mnt_gid))
2745 if (old->mnt_file_mode != new->mnt_file_mode ||
2746 old->mnt_dir_mode != new->mnt_dir_mode)
2749 if (strcmp(old->local_nls->charset, new->local_nls->charset))
2752 if (old->actimeo != new->actimeo)
2759 cifs_match_super(struct super_block *sb, void *data)
2761 struct cifs_mnt_data *mnt_data = (struct cifs_mnt_data *)data;
2762 struct smb_vol *volume_info;
2763 struct cifs_sb_info *cifs_sb;
2764 struct TCP_Server_Info *tcp_srv;
2765 struct cifs_ses *ses;
2766 struct cifs_tcon *tcon;
2767 struct tcon_link *tlink;
2770 spin_lock(&cifs_tcp_ses_lock);
2771 cifs_sb = CIFS_SB(sb);
2772 tlink = cifs_get_tlink(cifs_sb_master_tlink(cifs_sb));
2773 if (IS_ERR(tlink)) {
2774 spin_unlock(&cifs_tcp_ses_lock);
2777 tcon = tlink_tcon(tlink);
2779 tcp_srv = ses->server;
2781 volume_info = mnt_data->vol;
2783 if (!match_server(tcp_srv, volume_info) ||
2784 !match_session(ses, volume_info) ||
2785 !match_tcon(tcon, volume_info->UNC)) {
2790 rc = compare_mount_options(sb, mnt_data);
2792 spin_unlock(&cifs_tcp_ses_lock);
2793 cifs_put_tlink(tlink);
2798 get_dfs_path(const unsigned int xid, struct cifs_ses *ses, const char *old_path,
2799 const struct nls_table *nls_codepage, unsigned int *num_referrals,
2800 struct dfs_info3_param **referrals, int remap)
2805 if (!ses->server->ops->tree_connect || !ses->server->ops->get_dfs_refer)
2811 if (ses->ipc_tid == 0) {
2812 temp_unc = kmalloc(2 /* for slashes */ +
2813 strnlen(ses->serverName, SERVER_NAME_LEN_WITH_NULL * 2)
2814 + 1 + 4 /* slash IPC$ */ + 2, GFP_KERNEL);
2815 if (temp_unc == NULL)
2819 strcpy(temp_unc + 2, ses->serverName);
2820 strcpy(temp_unc + 2 + strlen(ses->serverName), "\\IPC$");
2821 rc = ses->server->ops->tree_connect(xid, ses, temp_unc, NULL,
2823 cFYI(1, "Tcon rc = %d ipc_tid = %d", rc, ses->ipc_tid);
2827 rc = ses->server->ops->get_dfs_refer(xid, ses, old_path,
2828 referrals, num_referrals,
2829 nls_codepage, remap);
2831 * BB - map targetUNCs to dfs_info3 structures, here or in
2832 * ses->server->ops->get_dfs_refer.
2838 #ifdef CONFIG_DEBUG_LOCK_ALLOC
2839 static struct lock_class_key cifs_key[2];
2840 static struct lock_class_key cifs_slock_key[2];
2843 cifs_reclassify_socket4(struct socket *sock)
2845 struct sock *sk = sock->sk;
2846 BUG_ON(sock_owned_by_user(sk));
2847 sock_lock_init_class_and_name(sk, "slock-AF_INET-CIFS",
2848 &cifs_slock_key[0], "sk_lock-AF_INET-CIFS", &cifs_key[0]);
2852 cifs_reclassify_socket6(struct socket *sock)
2854 struct sock *sk = sock->sk;
2855 BUG_ON(sock_owned_by_user(sk));
2856 sock_lock_init_class_and_name(sk, "slock-AF_INET6-CIFS",
2857 &cifs_slock_key[1], "sk_lock-AF_INET6-CIFS", &cifs_key[1]);
2861 cifs_reclassify_socket4(struct socket *sock)
2866 cifs_reclassify_socket6(struct socket *sock)
2871 /* See RFC1001 section 14 on representation of Netbios names */
2872 static void rfc1002mangle(char *target, char *source, unsigned int length)
2876 for (i = 0, j = 0; i < (length); i++) {
2877 /* mask a nibble at a time and encode */
2878 target[j] = 'A' + (0x0F & (source[i] >> 4));
2879 target[j+1] = 'A' + (0x0F & source[i]);
2886 bind_socket(struct TCP_Server_Info *server)
2889 if (server->srcaddr.ss_family != AF_UNSPEC) {
2890 /* Bind to the specified local IP address */
2891 struct socket *socket = server->ssocket;
2892 rc = socket->ops->bind(socket,
2893 (struct sockaddr *) &server->srcaddr,
2894 sizeof(server->srcaddr));
2896 struct sockaddr_in *saddr4;
2897 struct sockaddr_in6 *saddr6;
2898 saddr4 = (struct sockaddr_in *)&server->srcaddr;
2899 saddr6 = (struct sockaddr_in6 *)&server->srcaddr;
2900 if (saddr6->sin6_family == AF_INET6)
2902 "Failed to bind to: %pI6c, error: %d",
2903 &saddr6->sin6_addr, rc);
2906 "Failed to bind to: %pI4, error: %d",
2907 &saddr4->sin_addr.s_addr, rc);
2914 ip_rfc1001_connect(struct TCP_Server_Info *server)
2918 * some servers require RFC1001 sessinit before sending
2919 * negprot - BB check reconnection in case where second
2920 * sessinit is sent but no second negprot
2922 struct rfc1002_session_packet *ses_init_buf;
2923 struct smb_hdr *smb_buf;
2924 ses_init_buf = kzalloc(sizeof(struct rfc1002_session_packet),
2927 ses_init_buf->trailer.session_req.called_len = 32;
2929 if (server->server_RFC1001_name &&
2930 server->server_RFC1001_name[0] != 0)
2931 rfc1002mangle(ses_init_buf->trailer.
2932 session_req.called_name,
2933 server->server_RFC1001_name,
2934 RFC1001_NAME_LEN_WITH_NULL);
2936 rfc1002mangle(ses_init_buf->trailer.
2937 session_req.called_name,
2938 DEFAULT_CIFS_CALLED_NAME,
2939 RFC1001_NAME_LEN_WITH_NULL);
2941 ses_init_buf->trailer.session_req.calling_len = 32;
2944 * calling name ends in null (byte 16) from old smb
2947 if (server->workstation_RFC1001_name &&
2948 server->workstation_RFC1001_name[0] != 0)
2949 rfc1002mangle(ses_init_buf->trailer.
2950 session_req.calling_name,
2951 server->workstation_RFC1001_name,
2952 RFC1001_NAME_LEN_WITH_NULL);
2954 rfc1002mangle(ses_init_buf->trailer.
2955 session_req.calling_name,
2957 RFC1001_NAME_LEN_WITH_NULL);
2959 ses_init_buf->trailer.session_req.scope1 = 0;
2960 ses_init_buf->trailer.session_req.scope2 = 0;
2961 smb_buf = (struct smb_hdr *)ses_init_buf;
2963 /* sizeof RFC1002_SESSION_REQUEST with no scope */
2964 smb_buf->smb_buf_length = cpu_to_be32(0x81000044);
2965 rc = smb_send(server, smb_buf, 0x44);
2966 kfree(ses_init_buf);
2968 * RFC1001 layer in at least one server
2969 * requires very short break before negprot
2970 * presumably because not expecting negprot
2971 * to follow so fast. This is a simple
2972 * solution that works without
2973 * complicating the code and causes no
2974 * significant slowing down on mount
2977 usleep_range(1000, 2000);
2980 * else the negprot may still work without this
2981 * even though malloc failed
2988 generic_ip_connect(struct TCP_Server_Info *server)
2993 struct socket *socket = server->ssocket;
2994 struct sockaddr *saddr;
2996 saddr = (struct sockaddr *) &server->dstaddr;
2998 if (server->dstaddr.ss_family == AF_INET6) {
2999 sport = ((struct sockaddr_in6 *) saddr)->sin6_port;
3000 slen = sizeof(struct sockaddr_in6);
3003 sport = ((struct sockaddr_in *) saddr)->sin_port;
3004 slen = sizeof(struct sockaddr_in);
3008 if (socket == NULL) {
3009 rc = __sock_create(cifs_net_ns(server), sfamily, SOCK_STREAM,
3010 IPPROTO_TCP, &socket, 1);
3012 cERROR(1, "Error %d creating socket", rc);
3013 server->ssocket = NULL;
3017 /* BB other socket options to set KEEPALIVE, NODELAY? */
3018 cFYI(1, "Socket created");
3019 server->ssocket = socket;
3020 socket->sk->sk_allocation = GFP_NOFS;
3021 if (sfamily == AF_INET6)
3022 cifs_reclassify_socket6(socket);
3024 cifs_reclassify_socket4(socket);
3027 rc = bind_socket(server);
3032 * Eventually check for other socket options to change from
3033 * the default. sock_setsockopt not used because it expects
3036 socket->sk->sk_rcvtimeo = 7 * HZ;
3037 socket->sk->sk_sndtimeo = 5 * HZ;
3039 /* make the bufsizes depend on wsize/rsize and max requests */
3040 if (server->noautotune) {
3041 if (socket->sk->sk_sndbuf < (200 * 1024))
3042 socket->sk->sk_sndbuf = 200 * 1024;
3043 if (socket->sk->sk_rcvbuf < (140 * 1024))
3044 socket->sk->sk_rcvbuf = 140 * 1024;
3047 if (server->tcp_nodelay) {
3049 rc = kernel_setsockopt(socket, SOL_TCP, TCP_NODELAY,
3050 (char *)&val, sizeof(val));
3052 cFYI(1, "set TCP_NODELAY socket option error %d", rc);
3055 cFYI(1, "sndbuf %d rcvbuf %d rcvtimeo 0x%lx",
3056 socket->sk->sk_sndbuf,
3057 socket->sk->sk_rcvbuf, socket->sk->sk_rcvtimeo);
3059 rc = socket->ops->connect(socket, saddr, slen, 0);
3061 cFYI(1, "Error %d connecting to server", rc);
3062 sock_release(socket);
3063 server->ssocket = NULL;
3067 if (sport == htons(RFC1001_PORT))
3068 rc = ip_rfc1001_connect(server);
3074 ip_connect(struct TCP_Server_Info *server)
3077 struct sockaddr_in6 *addr6 = (struct sockaddr_in6 *)&server->dstaddr;
3078 struct sockaddr_in *addr = (struct sockaddr_in *)&server->dstaddr;
3080 if (server->dstaddr.ss_family == AF_INET6)
3081 sport = &addr6->sin6_port;
3083 sport = &addr->sin_port;
3088 /* try with 445 port at first */
3089 *sport = htons(CIFS_PORT);
3091 rc = generic_ip_connect(server);
3095 /* if it failed, try with 139 port */
3096 *sport = htons(RFC1001_PORT);
3099 return generic_ip_connect(server);
3102 void reset_cifs_unix_caps(unsigned int xid, struct cifs_tcon *tcon,
3103 struct cifs_sb_info *cifs_sb, struct smb_vol *vol_info)
3105 /* if we are reconnecting then should we check to see if
3106 * any requested capabilities changed locally e.g. via
3107 * remount but we can not do much about it here
3108 * if they have (even if we could detect it by the following)
3109 * Perhaps we could add a backpointer to array of sb from tcon
3110 * or if we change to make all sb to same share the same
3111 * sb as NFS - then we only have one backpointer to sb.
3112 * What if we wanted to mount the server share twice once with
3113 * and once without posixacls or posix paths? */
3114 __u64 saved_cap = le64_to_cpu(tcon->fsUnixInfo.Capability);
3116 if (vol_info && vol_info->no_linux_ext) {
3117 tcon->fsUnixInfo.Capability = 0;
3118 tcon->unix_ext = 0; /* Unix Extensions disabled */
3119 cFYI(1, "Linux protocol extensions disabled");
3121 } else if (vol_info)
3122 tcon->unix_ext = 1; /* Unix Extensions supported */
3124 if (tcon->unix_ext == 0) {
3125 cFYI(1, "Unix extensions disabled so not set on reconnect");
3129 if (!CIFSSMBQFSUnixInfo(xid, tcon)) {
3130 __u64 cap = le64_to_cpu(tcon->fsUnixInfo.Capability);
3131 cFYI(1, "unix caps which server supports %lld", cap);
3132 /* check for reconnect case in which we do not
3133 want to change the mount behavior if we can avoid it */
3134 if (vol_info == NULL) {
3135 /* turn off POSIX ACL and PATHNAMES if not set
3136 originally at mount time */
3137 if ((saved_cap & CIFS_UNIX_POSIX_ACL_CAP) == 0)
3138 cap &= ~CIFS_UNIX_POSIX_ACL_CAP;
3139 if ((saved_cap & CIFS_UNIX_POSIX_PATHNAMES_CAP) == 0) {
3140 if (cap & CIFS_UNIX_POSIX_PATHNAMES_CAP)
3141 cERROR(1, "POSIXPATH support change");
3142 cap &= ~CIFS_UNIX_POSIX_PATHNAMES_CAP;
3143 } else if ((cap & CIFS_UNIX_POSIX_PATHNAMES_CAP) == 0) {
3144 cERROR(1, "possible reconnect error");
3145 cERROR(1, "server disabled POSIX path support");
3149 if (cap & CIFS_UNIX_TRANSPORT_ENCRYPTION_MANDATORY_CAP)
3150 cERROR(1, "per-share encryption not supported yet");
3152 cap &= CIFS_UNIX_CAP_MASK;
3153 if (vol_info && vol_info->no_psx_acl)
3154 cap &= ~CIFS_UNIX_POSIX_ACL_CAP;
3155 else if (CIFS_UNIX_POSIX_ACL_CAP & cap) {
3156 cFYI(1, "negotiated posix acl support");
3158 cifs_sb->mnt_cifs_flags |=
3159 CIFS_MOUNT_POSIXACL;
3162 if (vol_info && vol_info->posix_paths == 0)
3163 cap &= ~CIFS_UNIX_POSIX_PATHNAMES_CAP;
3164 else if (cap & CIFS_UNIX_POSIX_PATHNAMES_CAP) {
3165 cFYI(1, "negotiate posix pathnames");
3167 cifs_sb->mnt_cifs_flags |=
3168 CIFS_MOUNT_POSIX_PATHS;
3171 cFYI(1, "Negotiate caps 0x%x", (int)cap);
3172 #ifdef CONFIG_CIFS_DEBUG2
3173 if (cap & CIFS_UNIX_FCNTL_CAP)
3174 cFYI(1, "FCNTL cap");
3175 if (cap & CIFS_UNIX_EXTATTR_CAP)
3176 cFYI(1, "EXTATTR cap");
3177 if (cap & CIFS_UNIX_POSIX_PATHNAMES_CAP)
3178 cFYI(1, "POSIX path cap");
3179 if (cap & CIFS_UNIX_XATTR_CAP)
3180 cFYI(1, "XATTR cap");
3181 if (cap & CIFS_UNIX_POSIX_ACL_CAP)
3182 cFYI(1, "POSIX ACL cap");
3183 if (cap & CIFS_UNIX_LARGE_READ_CAP)
3184 cFYI(1, "very large read cap");
3185 if (cap & CIFS_UNIX_LARGE_WRITE_CAP)
3186 cFYI(1, "very large write cap");
3187 if (cap & CIFS_UNIX_TRANSPORT_ENCRYPTION_CAP)
3188 cFYI(1, "transport encryption cap");
3189 if (cap & CIFS_UNIX_TRANSPORT_ENCRYPTION_MANDATORY_CAP)
3190 cFYI(1, "mandatory transport encryption cap");
3191 #endif /* CIFS_DEBUG2 */
3192 if (CIFSSMBSetFSUnixInfo(xid, tcon, cap)) {
3193 if (vol_info == NULL) {
3194 cFYI(1, "resetting capabilities failed");
3196 cERROR(1, "Negotiating Unix capabilities "
3197 "with the server failed. Consider "
3198 "mounting with the Unix Extensions "
3199 "disabled if problems are found "
3200 "by specifying the nounix mount "
3207 void cifs_setup_cifs_sb(struct smb_vol *pvolume_info,
3208 struct cifs_sb_info *cifs_sb)
3210 INIT_DELAYED_WORK(&cifs_sb->prune_tlinks, cifs_prune_tlinks);
3212 spin_lock_init(&cifs_sb->tlink_tree_lock);
3213 cifs_sb->tlink_tree = RB_ROOT;
3216 * Temporarily set r/wsize for matching superblock. If we end up using
3217 * new sb then client will later negotiate it downward if needed.
3219 cifs_sb->rsize = pvolume_info->rsize;
3220 cifs_sb->wsize = pvolume_info->wsize;
3222 cifs_sb->mnt_uid = pvolume_info->linux_uid;
3223 cifs_sb->mnt_gid = pvolume_info->linux_gid;
3224 cifs_sb->mnt_file_mode = pvolume_info->file_mode;
3225 cifs_sb->mnt_dir_mode = pvolume_info->dir_mode;
3226 cFYI(1, "file mode: 0x%hx dir mode: 0x%hx",
3227 cifs_sb->mnt_file_mode, cifs_sb->mnt_dir_mode);
3229 cifs_sb->actimeo = pvolume_info->actimeo;
3230 cifs_sb->local_nls = pvolume_info->local_nls;
3232 if (pvolume_info->noperm)
3233 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_NO_PERM;
3234 if (pvolume_info->setuids)
3235 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_SET_UID;
3236 if (pvolume_info->server_ino)
3237 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_SERVER_INUM;
3238 if (pvolume_info->remap)
3239 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_MAP_SPECIAL_CHR;
3240 if (pvolume_info->no_xattr)
3241 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_NO_XATTR;
3242 if (pvolume_info->sfu_emul)
3243 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_UNX_EMUL;
3244 if (pvolume_info->nobrl)
3245 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_NO_BRL;
3246 if (pvolume_info->nostrictsync)
3247 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_NOSSYNC;
3248 if (pvolume_info->mand_lock)
3249 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_NOPOSIXBRL;
3250 if (pvolume_info->rwpidforward)
3251 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_RWPIDFORWARD;
3252 if (pvolume_info->cifs_acl)
3253 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_CIFS_ACL;
3254 if (pvolume_info->backupuid_specified) {
3255 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_CIFS_BACKUPUID;
3256 cifs_sb->mnt_backupuid = pvolume_info->backupuid;
3258 if (pvolume_info->backupgid_specified) {
3259 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_CIFS_BACKUPGID;
3260 cifs_sb->mnt_backupgid = pvolume_info->backupgid;
3262 if (pvolume_info->override_uid)
3263 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_OVERR_UID;
3264 if (pvolume_info->override_gid)
3265 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_OVERR_GID;
3266 if (pvolume_info->dynperm)
3267 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_DYNPERM;
3268 if (pvolume_info->fsc)
3269 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_FSCACHE;
3270 if (pvolume_info->multiuser)
3271 cifs_sb->mnt_cifs_flags |= (CIFS_MOUNT_MULTIUSER |
3272 CIFS_MOUNT_NO_PERM);
3273 if (pvolume_info->strict_io)
3274 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_STRICT_IO;
3275 if (pvolume_info->direct_io) {
3276 cFYI(1, "mounting share using direct i/o");
3277 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_DIRECT_IO;
3279 if (pvolume_info->mfsymlinks) {
3280 if (pvolume_info->sfu_emul) {
3281 cERROR(1, "mount option mfsymlinks ignored if sfu "
3282 "mount option is used");
3284 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_MF_SYMLINKS;
3288 if ((pvolume_info->cifs_acl) && (pvolume_info->dynperm))
3289 cERROR(1, "mount option dynperm ignored if cifsacl "
3290 "mount option supported");
3294 cleanup_volume_info_contents(struct smb_vol *volume_info)
3296 kfree(volume_info->username);
3297 kzfree(volume_info->password);
3298 kfree(volume_info->UNC);
3299 kfree(volume_info->domainname);
3300 kfree(volume_info->iocharset);
3301 kfree(volume_info->prepath);
3305 cifs_cleanup_volume_info(struct smb_vol *volume_info)
3309 cleanup_volume_info_contents(volume_info);
3314 #ifdef CONFIG_CIFS_DFS_UPCALL
3316 * cifs_build_path_to_root returns full path to root when we do not have an
3317 * exiting connection (tcon)
3320 build_unc_path_to_root(const struct smb_vol *vol,
3321 const struct cifs_sb_info *cifs_sb)
3323 char *full_path, *pos;
3324 unsigned int pplen = vol->prepath ? strlen(vol->prepath) + 1 : 0;
3325 unsigned int unc_len = strnlen(vol->UNC, MAX_TREE_SIZE + 1);
3327 full_path = kmalloc(unc_len + pplen + 1, GFP_KERNEL);
3328 if (full_path == NULL)
3329 return ERR_PTR(-ENOMEM);
3331 strncpy(full_path, vol->UNC, unc_len);
3332 pos = full_path + unc_len;
3335 *pos++ = CIFS_DIR_SEP(cifs_sb);
3336 strncpy(pos, vol->prepath, pplen);
3340 *pos = '\0'; /* add trailing null */
3341 convert_delimiter(full_path, CIFS_DIR_SEP(cifs_sb));
3342 cFYI(1, "%s: full_path=%s", __func__, full_path);
3347 * Perform a dfs referral query for a share and (optionally) prefix
3349 * If a referral is found, cifs_sb->mountdata will be (re-)allocated
3350 * to a string containing updated options for the submount. Otherwise it
3351 * will be left untouched.
3353 * Returns the rc from get_dfs_path to the caller, which can be used to
3354 * determine whether there were referrals.
3357 expand_dfs_referral(const unsigned int xid, struct cifs_ses *ses,
3358 struct smb_vol *volume_info, struct cifs_sb_info *cifs_sb,
3362 unsigned int num_referrals = 0;
3363 struct dfs_info3_param *referrals = NULL;
3364 char *full_path = NULL, *ref_path = NULL, *mdata = NULL;
3366 full_path = build_unc_path_to_root(volume_info, cifs_sb);
3367 if (IS_ERR(full_path))
3368 return PTR_ERR(full_path);
3370 /* For DFS paths, skip the first '\' of the UNC */
3371 ref_path = check_prefix ? full_path + 1 : volume_info->UNC + 1;
3373 rc = get_dfs_path(xid, ses, ref_path, cifs_sb->local_nls,
3374 &num_referrals, &referrals,
3375 cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR);
3377 if (!rc && num_referrals > 0) {
3378 char *fake_devname = NULL;
3380 mdata = cifs_compose_mount_options(cifs_sb->mountdata,
3381 full_path + 1, referrals,
3384 free_dfs_info_array(referrals, num_referrals);
3386 if (IS_ERR(mdata)) {
3387 rc = PTR_ERR(mdata);
3390 cleanup_volume_info_contents(volume_info);
3391 rc = cifs_setup_volume_info(volume_info, mdata,
3394 kfree(fake_devname);
3395 kfree(cifs_sb->mountdata);
3396 cifs_sb->mountdata = mdata;
3404 cifs_setup_volume_info(struct smb_vol *volume_info, char *mount_data,
3405 const char *devname)
3409 if (cifs_parse_mount_options(mount_data, devname, volume_info))
3412 if (volume_info->nullauth) {
3413 cFYI(1, "Anonymous login");
3414 kfree(volume_info->username);
3415 volume_info->username = NULL;
3416 } else if (volume_info->username) {
3417 /* BB fixme parse for domain name here */
3418 cFYI(1, "Username: %s", volume_info->username);
3420 cifserror("No username specified");
3421 /* In userspace mount helper we can get user name from alternate
3422 locations such as env variables and files on disk */
3426 /* this is needed for ASCII cp to Unicode converts */
3427 if (volume_info->iocharset == NULL) {
3428 /* load_nls_default cannot return null */
3429 volume_info->local_nls = load_nls_default();
3431 volume_info->local_nls = load_nls(volume_info->iocharset);
3432 if (volume_info->local_nls == NULL) {
3433 cERROR(1, "CIFS mount error: iocharset %s not found",
3434 volume_info->iocharset);
3443 cifs_get_volume_info(char *mount_data, const char *devname)
3446 struct smb_vol *volume_info;
3448 volume_info = kmalloc(sizeof(struct smb_vol), GFP_KERNEL);
3450 return ERR_PTR(-ENOMEM);
3452 rc = cifs_setup_volume_info(volume_info, mount_data, devname);
3454 cifs_cleanup_volume_info(volume_info);
3455 volume_info = ERR_PTR(rc);
3462 cifs_mount(struct cifs_sb_info *cifs_sb, struct smb_vol *volume_info)
3466 struct cifs_ses *ses;
3467 struct cifs_tcon *tcon;
3468 struct TCP_Server_Info *server;
3470 struct tcon_link *tlink;
3471 #ifdef CONFIG_CIFS_DFS_UPCALL
3472 int referral_walks_count = 0;
3475 rc = bdi_setup_and_register(&cifs_sb->bdi, "cifs", BDI_CAP_MAP_COPY);
3479 #ifdef CONFIG_CIFS_DFS_UPCALL
3481 /* cleanup activities if we're chasing a referral */
3482 if (referral_walks_count) {
3484 cifs_put_tcon(tcon);
3486 cifs_put_smb_ses(ses);
3500 /* get a reference to a tcp session */
3501 server = cifs_get_tcp_session(volume_info);
3502 if (IS_ERR(server)) {
3503 rc = PTR_ERR(server);
3504 bdi_destroy(&cifs_sb->bdi);
3508 /* get a reference to a SMB session */
3509 ses = cifs_get_smb_ses(server, volume_info);
3513 goto mount_fail_check;
3516 /* search for existing tcon to this server share */
3517 tcon = cifs_get_tcon(ses, volume_info);
3521 goto remote_path_check;
3524 /* tell server which Unix caps we support */
3525 if (cap_unix(tcon->ses)) {
3526 /* reset of caps checks mount to see if unix extensions
3527 disabled for just this mount */
3528 reset_cifs_unix_caps(xid, tcon, cifs_sb, volume_info);
3529 if ((tcon->ses->server->tcpStatus == CifsNeedReconnect) &&
3530 (le64_to_cpu(tcon->fsUnixInfo.Capability) &
3531 CIFS_UNIX_TRANSPORT_ENCRYPTION_MANDATORY_CAP)) {
3533 goto mount_fail_check;
3536 tcon->unix_ext = 0; /* server does not support them */
3538 /* do not care if a following call succeed - informational */
3539 if (!tcon->ipc && server->ops->qfs_tcon)
3540 server->ops->qfs_tcon(xid, tcon);
3542 cifs_sb->wsize = server->ops->negotiate_wsize(tcon, volume_info);
3543 cifs_sb->rsize = server->ops->negotiate_rsize(tcon, volume_info);
3545 /* tune readahead according to rsize */
3546 cifs_sb->bdi.ra_pages = cifs_sb->rsize / PAGE_CACHE_SIZE;
3549 #ifdef CONFIG_CIFS_DFS_UPCALL
3551 * Perform an unconditional check for whether there are DFS
3552 * referrals for this path without prefix, to provide support
3553 * for DFS referrals from w2k8 servers which don't seem to respond
3554 * with PATH_NOT_COVERED to requests that include the prefix.
3555 * Chase the referral if found, otherwise continue normally.
3557 if (referral_walks_count == 0) {
3558 int refrc = expand_dfs_referral(xid, ses, volume_info, cifs_sb,
3561 referral_walks_count++;
3562 goto try_mount_again;
3567 /* check if a whole path is not remote */
3569 if (!server->ops->is_path_accessible) {
3571 goto mount_fail_check;
3574 * cifs_build_path_to_root works only when we have a valid tcon
3576 full_path = cifs_build_path_to_root(volume_info, cifs_sb, tcon);
3577 if (full_path == NULL) {
3579 goto mount_fail_check;
3581 rc = server->ops->is_path_accessible(xid, tcon, cifs_sb,
3583 if (rc != 0 && rc != -EREMOTE) {
3585 goto mount_fail_check;
3590 /* get referral if needed */
3591 if (rc == -EREMOTE) {
3592 #ifdef CONFIG_CIFS_DFS_UPCALL
3593 if (referral_walks_count > MAX_NESTED_LINKS) {
3595 * BB: when we implement proper loop detection,
3596 * we will remove this check. But now we need it
3597 * to prevent an indefinite loop if 'DFS tree' is
3598 * misconfigured (i.e. has loops).
3601 goto mount_fail_check;
3604 rc = expand_dfs_referral(xid, ses, volume_info, cifs_sb, true);
3607 referral_walks_count++;
3608 goto try_mount_again;
3610 goto mount_fail_check;
3611 #else /* No DFS support, return error on mount */
3617 goto mount_fail_check;
3619 /* now, hang the tcon off of the superblock */
3620 tlink = kzalloc(sizeof *tlink, GFP_KERNEL);
3621 if (tlink == NULL) {
3623 goto mount_fail_check;
3626 tlink->tl_uid = ses->linux_uid;
3627 tlink->tl_tcon = tcon;
3628 tlink->tl_time = jiffies;
3629 set_bit(TCON_LINK_MASTER, &tlink->tl_flags);
3630 set_bit(TCON_LINK_IN_TREE, &tlink->tl_flags);
3632 cifs_sb->master_tlink = tlink;
3633 spin_lock(&cifs_sb->tlink_tree_lock);
3634 tlink_rb_insert(&cifs_sb->tlink_tree, tlink);
3635 spin_unlock(&cifs_sb->tlink_tree_lock);
3637 queue_delayed_work(cifsiod_wq, &cifs_sb->prune_tlinks,
3641 /* on error free sesinfo and tcon struct if needed */
3643 /* If find_unc succeeded then rc == 0 so we can not end */
3644 /* up accidentally freeing someone elses tcon struct */
3646 cifs_put_tcon(tcon);
3648 cifs_put_smb_ses(ses);
3650 cifs_put_tcp_session(server);
3651 bdi_destroy(&cifs_sb->bdi);
3660 * Issue a TREE_CONNECT request. Note that for IPC$ shares, that the tcon
3661 * pointer may be NULL.
3664 CIFSTCon(const unsigned int xid, struct cifs_ses *ses,
3665 const char *tree, struct cifs_tcon *tcon,
3666 const struct nls_table *nls_codepage)
3668 struct smb_hdr *smb_buffer;
3669 struct smb_hdr *smb_buffer_response;
3672 unsigned char *bcc_ptr;
3675 __u16 bytes_left, count;
3680 smb_buffer = cifs_buf_get();
3681 if (smb_buffer == NULL)
3684 smb_buffer_response = smb_buffer;
3686 header_assemble(smb_buffer, SMB_COM_TREE_CONNECT_ANDX,
3687 NULL /*no tid */ , 4 /*wct */ );
3689 smb_buffer->Mid = get_next_mid(ses->server);
3690 smb_buffer->Uid = ses->Suid;
3691 pSMB = (TCONX_REQ *) smb_buffer;
3692 pSMBr = (TCONX_RSP *) smb_buffer_response;
3694 pSMB->AndXCommand = 0xFF;
3695 pSMB->Flags = cpu_to_le16(TCON_EXTENDED_SECINFO);
3696 bcc_ptr = &pSMB->Password[0];
3697 if (!tcon || (ses->server->sec_mode & SECMODE_USER)) {
3698 pSMB->PasswordLength = cpu_to_le16(1); /* minimum */
3699 *bcc_ptr = 0; /* password is null byte */
3700 bcc_ptr++; /* skip password */
3701 /* already aligned so no need to do it below */
3703 pSMB->PasswordLength = cpu_to_le16(CIFS_AUTH_RESP_SIZE);
3704 /* BB FIXME add code to fail this if NTLMv2 or Kerberos
3705 specified as required (when that support is added to
3706 the vfs in the future) as only NTLM or the much
3707 weaker LANMAN (which we do not send by default) is accepted
3708 by Samba (not sure whether other servers allow
3709 NTLMv2 password here) */
3710 #ifdef CONFIG_CIFS_WEAK_PW_HASH
3711 if ((global_secflags & CIFSSEC_MAY_LANMAN) &&
3712 (ses->server->secType == LANMAN))
3713 calc_lanman_hash(tcon->password, ses->server->cryptkey,
3714 ses->server->sec_mode &
3715 SECMODE_PW_ENCRYPT ? true : false,
3718 #endif /* CIFS_WEAK_PW_HASH */
3719 rc = SMBNTencrypt(tcon->password, ses->server->cryptkey,
3720 bcc_ptr, nls_codepage);
3722 bcc_ptr += CIFS_AUTH_RESP_SIZE;
3723 if (ses->capabilities & CAP_UNICODE) {
3724 /* must align unicode strings */
3725 *bcc_ptr = 0; /* null byte password */
3730 if (ses->server->sec_mode &
3731 (SECMODE_SIGN_REQUIRED | SECMODE_SIGN_ENABLED))
3732 smb_buffer->Flags2 |= SMBFLG2_SECURITY_SIGNATURE;
3734 if (ses->capabilities & CAP_STATUS32) {
3735 smb_buffer->Flags2 |= SMBFLG2_ERR_STATUS;
3737 if (ses->capabilities & CAP_DFS) {
3738 smb_buffer->Flags2 |= SMBFLG2_DFS;
3740 if (ses->capabilities & CAP_UNICODE) {
3741 smb_buffer->Flags2 |= SMBFLG2_UNICODE;
3743 cifs_strtoUTF16((__le16 *) bcc_ptr, tree,
3744 6 /* max utf8 char length in bytes */ *
3745 (/* server len*/ + 256 /* share len */), nls_codepage);
3746 bcc_ptr += 2 * length; /* convert num 16 bit words to bytes */
3747 bcc_ptr += 2; /* skip trailing null */
3748 } else { /* ASCII */
3749 strcpy(bcc_ptr, tree);
3750 bcc_ptr += strlen(tree) + 1;
3752 strcpy(bcc_ptr, "?????");
3753 bcc_ptr += strlen("?????");
3755 count = bcc_ptr - &pSMB->Password[0];
3756 pSMB->hdr.smb_buf_length = cpu_to_be32(be32_to_cpu(
3757 pSMB->hdr.smb_buf_length) + count);
3758 pSMB->ByteCount = cpu_to_le16(count);
3760 rc = SendReceive(xid, ses, smb_buffer, smb_buffer_response, &length,
3763 /* above now done in SendReceive */
3764 if ((rc == 0) && (tcon != NULL)) {
3767 tcon->tidStatus = CifsGood;
3768 tcon->need_reconnect = false;
3769 tcon->tid = smb_buffer_response->Tid;
3770 bcc_ptr = pByteArea(smb_buffer_response);
3771 bytes_left = get_bcc(smb_buffer_response);
3772 length = strnlen(bcc_ptr, bytes_left - 2);
3773 if (smb_buffer->Flags2 & SMBFLG2_UNICODE)
3779 /* skip service field (NB: this field is always ASCII) */
3781 if ((bcc_ptr[0] == 'I') && (bcc_ptr[1] == 'P') &&
3782 (bcc_ptr[2] == 'C')) {
3783 cFYI(1, "IPC connection");
3786 } else if (length == 2) {
3787 if ((bcc_ptr[0] == 'A') && (bcc_ptr[1] == ':')) {
3788 /* the most common case */
3789 cFYI(1, "disk share connection");
3792 bcc_ptr += length + 1;
3793 bytes_left -= (length + 1);
3794 strncpy(tcon->treeName, tree, MAX_TREE_SIZE);
3796 /* mostly informational -- no need to fail on error here */
3797 kfree(tcon->nativeFileSystem);
3798 tcon->nativeFileSystem = cifs_strndup_from_utf16(bcc_ptr,
3799 bytes_left, is_unicode,
3802 cFYI(1, "nativeFileSystem=%s", tcon->nativeFileSystem);
3804 if ((smb_buffer_response->WordCount == 3) ||
3805 (smb_buffer_response->WordCount == 7))
3806 /* field is in same location */
3807 tcon->Flags = le16_to_cpu(pSMBr->OptionalSupport);
3810 cFYI(1, "Tcon flags: 0x%x ", tcon->Flags);
3811 } else if ((rc == 0) && tcon == NULL) {
3812 /* all we need to save for IPC$ connection */
3813 ses->ipc_tid = smb_buffer_response->Tid;
3816 cifs_buf_release(smb_buffer);
3821 cifs_umount(struct cifs_sb_info *cifs_sb)
3823 struct rb_root *root = &cifs_sb->tlink_tree;
3824 struct rb_node *node;
3825 struct tcon_link *tlink;
3827 cancel_delayed_work_sync(&cifs_sb->prune_tlinks);
3829 spin_lock(&cifs_sb->tlink_tree_lock);
3830 while ((node = rb_first(root))) {
3831 tlink = rb_entry(node, struct tcon_link, tl_rbnode);
3832 cifs_get_tlink(tlink);
3833 clear_bit(TCON_LINK_IN_TREE, &tlink->tl_flags);
3834 rb_erase(node, root);
3836 spin_unlock(&cifs_sb->tlink_tree_lock);
3837 cifs_put_tlink(tlink);
3838 spin_lock(&cifs_sb->tlink_tree_lock);
3840 spin_unlock(&cifs_sb->tlink_tree_lock);
3842 bdi_destroy(&cifs_sb->bdi);
3843 kfree(cifs_sb->mountdata);
3844 unload_nls(cifs_sb->local_nls);
3849 cifs_negotiate_protocol(const unsigned int xid, struct cifs_ses *ses)
3852 struct TCP_Server_Info *server = ses->server;
3854 if (!server->ops->need_neg || !server->ops->negotiate)
3857 /* only send once per connect */
3858 if (!server->ops->need_neg(server))
3861 set_credits(server, 1);
3863 rc = server->ops->negotiate(xid, ses);
3865 spin_lock(&GlobalMid_Lock);
3866 if (server->tcpStatus == CifsNeedNegotiate)
3867 server->tcpStatus = CifsGood;
3870 spin_unlock(&GlobalMid_Lock);
3877 cifs_setup_session(const unsigned int xid, struct cifs_ses *ses,
3878 struct nls_table *nls_info)
3881 struct TCP_Server_Info *server = ses->server;
3884 ses->capabilities = server->capabilities;
3885 if (linuxExtEnabled == 0)
3886 ses->capabilities &= (~server->vals->cap_unix);
3888 cFYI(1, "Security Mode: 0x%x Capabilities: 0x%x TimeAdjust: %d",
3889 server->sec_mode, server->capabilities, server->timeAdj);
3891 if (server->ops->sess_setup)
3892 rc = server->ops->sess_setup(xid, ses, nls_info);
3895 cERROR(1, "Send error in SessSetup = %d", rc);
3897 mutex_lock(&ses->server->srv_mutex);
3898 if (!server->session_estab) {
3899 server->session_key.response = ses->auth_key.response;
3900 server->session_key.len = ses->auth_key.len;
3901 server->sequence_number = 0x2;
3902 server->session_estab = true;
3903 ses->auth_key.response = NULL;
3905 mutex_unlock(&server->srv_mutex);
3907 cFYI(1, "CIFS Session Established successfully");
3908 spin_lock(&GlobalMid_Lock);
3909 ses->status = CifsGood;
3910 ses->need_reconnect = false;
3911 spin_unlock(&GlobalMid_Lock);
3914 kfree(ses->auth_key.response);
3915 ses->auth_key.response = NULL;
3916 ses->auth_key.len = 0;
3917 kfree(ses->ntlmssp);
3918 ses->ntlmssp = NULL;
3924 cifs_set_vol_auth(struct smb_vol *vol, struct cifs_ses *ses)
3926 switch (ses->server->secType) {
3928 vol->secFlg = CIFSSEC_MUST_KRB5;
3931 vol->secFlg = CIFSSEC_MUST_NTLMV2;
3934 vol->secFlg = CIFSSEC_MUST_NTLM;
3937 vol->secFlg = CIFSSEC_MUST_NTLMSSP;
3940 vol->secFlg = CIFSSEC_MUST_LANMAN;
3944 return cifs_set_cifscreds(vol, ses);
3947 static struct cifs_tcon *
3948 cifs_construct_tcon(struct cifs_sb_info *cifs_sb, kuid_t fsuid)
3951 struct cifs_tcon *master_tcon = cifs_sb_master_tcon(cifs_sb);
3952 struct cifs_ses *ses;
3953 struct cifs_tcon *tcon = NULL;
3954 struct smb_vol *vol_info;
3956 vol_info = kzalloc(sizeof(*vol_info), GFP_KERNEL);
3957 if (vol_info == NULL)
3958 return ERR_PTR(-ENOMEM);
3960 vol_info->local_nls = cifs_sb->local_nls;
3961 vol_info->linux_uid = fsuid;
3962 vol_info->cred_uid = fsuid;
3963 vol_info->UNC = master_tcon->treeName;
3964 vol_info->retry = master_tcon->retry;
3965 vol_info->nocase = master_tcon->nocase;
3966 vol_info->local_lease = master_tcon->local_lease;
3967 vol_info->no_linux_ext = !master_tcon->unix_ext;
3969 rc = cifs_set_vol_auth(vol_info, master_tcon->ses);
3975 /* get a reference for the same TCP session */
3976 spin_lock(&cifs_tcp_ses_lock);
3977 ++master_tcon->ses->server->srv_count;
3978 spin_unlock(&cifs_tcp_ses_lock);
3980 ses = cifs_get_smb_ses(master_tcon->ses->server, vol_info);
3982 tcon = (struct cifs_tcon *)ses;
3983 cifs_put_tcp_session(master_tcon->ses->server);
3987 tcon = cifs_get_tcon(ses, vol_info);
3989 cifs_put_smb_ses(ses);
3994 reset_cifs_unix_caps(0, tcon, NULL, vol_info);
3996 kfree(vol_info->username);
3997 kfree(vol_info->password);
4004 cifs_sb_master_tcon(struct cifs_sb_info *cifs_sb)
4006 return tlink_tcon(cifs_sb_master_tlink(cifs_sb));
4010 cifs_sb_tcon_pending_wait(void *unused)
4013 return signal_pending(current) ? -ERESTARTSYS : 0;
4016 /* find and return a tlink with given uid */
4017 static struct tcon_link *
4018 tlink_rb_search(struct rb_root *root, kuid_t uid)
4020 struct rb_node *node = root->rb_node;
4021 struct tcon_link *tlink;
4024 tlink = rb_entry(node, struct tcon_link, tl_rbnode);
4026 if (uid_gt(tlink->tl_uid, uid))
4027 node = node->rb_left;
4028 else if (uid_lt(tlink->tl_uid, uid))
4029 node = node->rb_right;
4036 /* insert a tcon_link into the tree */
4038 tlink_rb_insert(struct rb_root *root, struct tcon_link *new_tlink)
4040 struct rb_node **new = &(root->rb_node), *parent = NULL;
4041 struct tcon_link *tlink;
4044 tlink = rb_entry(*new, struct tcon_link, tl_rbnode);
4047 if (uid_gt(tlink->tl_uid, new_tlink->tl_uid))
4048 new = &((*new)->rb_left);
4050 new = &((*new)->rb_right);
4053 rb_link_node(&new_tlink->tl_rbnode, parent, new);
4054 rb_insert_color(&new_tlink->tl_rbnode, root);
4058 * Find or construct an appropriate tcon given a cifs_sb and the fsuid of the
4061 * If the superblock doesn't refer to a multiuser mount, then just return
4062 * the master tcon for the mount.
4064 * First, search the rbtree for an existing tcon for this fsuid. If one
4065 * exists, then check to see if it's pending construction. If it is then wait
4066 * for construction to complete. Once it's no longer pending, check to see if
4067 * it failed and either return an error or retry construction, depending on
4070 * If one doesn't exist then insert a new tcon_link struct into the tree and
4071 * try to construct a new one.
4074 cifs_sb_tlink(struct cifs_sb_info *cifs_sb)
4077 kuid_t fsuid = current_fsuid();
4078 struct tcon_link *tlink, *newtlink;
4080 if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MULTIUSER))
4081 return cifs_get_tlink(cifs_sb_master_tlink(cifs_sb));
4083 spin_lock(&cifs_sb->tlink_tree_lock);
4084 tlink = tlink_rb_search(&cifs_sb->tlink_tree, fsuid);
4086 cifs_get_tlink(tlink);
4087 spin_unlock(&cifs_sb->tlink_tree_lock);
4089 if (tlink == NULL) {
4090 newtlink = kzalloc(sizeof(*tlink), GFP_KERNEL);
4091 if (newtlink == NULL)
4092 return ERR_PTR(-ENOMEM);
4093 newtlink->tl_uid = fsuid;
4094 newtlink->tl_tcon = ERR_PTR(-EACCES);
4095 set_bit(TCON_LINK_PENDING, &newtlink->tl_flags);
4096 set_bit(TCON_LINK_IN_TREE, &newtlink->tl_flags);
4097 cifs_get_tlink(newtlink);
4099 spin_lock(&cifs_sb->tlink_tree_lock);
4100 /* was one inserted after previous search? */
4101 tlink = tlink_rb_search(&cifs_sb->tlink_tree, fsuid);
4103 cifs_get_tlink(tlink);
4104 spin_unlock(&cifs_sb->tlink_tree_lock);
4106 goto wait_for_construction;
4109 tlink_rb_insert(&cifs_sb->tlink_tree, tlink);
4110 spin_unlock(&cifs_sb->tlink_tree_lock);
4112 wait_for_construction:
4113 ret = wait_on_bit(&tlink->tl_flags, TCON_LINK_PENDING,
4114 cifs_sb_tcon_pending_wait,
4115 TASK_INTERRUPTIBLE);
4117 cifs_put_tlink(tlink);
4118 return ERR_PTR(ret);
4121 /* if it's good, return it */
4122 if (!IS_ERR(tlink->tl_tcon))
4125 /* return error if we tried this already recently */
4126 if (time_before(jiffies, tlink->tl_time + TLINK_ERROR_EXPIRE)) {
4127 cifs_put_tlink(tlink);
4128 return ERR_PTR(-EACCES);
4131 if (test_and_set_bit(TCON_LINK_PENDING, &tlink->tl_flags))
4132 goto wait_for_construction;
4135 tlink->tl_tcon = cifs_construct_tcon(cifs_sb, fsuid);
4136 clear_bit(TCON_LINK_PENDING, &tlink->tl_flags);
4137 wake_up_bit(&tlink->tl_flags, TCON_LINK_PENDING);
4139 if (IS_ERR(tlink->tl_tcon)) {
4140 cifs_put_tlink(tlink);
4141 return ERR_PTR(-EACCES);
4148 * periodic workqueue job that scans tcon_tree for a superblock and closes
4152 cifs_prune_tlinks(struct work_struct *work)
4154 struct cifs_sb_info *cifs_sb = container_of(work, struct cifs_sb_info,
4156 struct rb_root *root = &cifs_sb->tlink_tree;
4157 struct rb_node *node = rb_first(root);
4158 struct rb_node *tmp;
4159 struct tcon_link *tlink;
4162 * Because we drop the spinlock in the loop in order to put the tlink
4163 * it's not guarded against removal of links from the tree. The only
4164 * places that remove entries from the tree are this function and
4165 * umounts. Because this function is non-reentrant and is canceled
4166 * before umount can proceed, this is safe.
4168 spin_lock(&cifs_sb->tlink_tree_lock);
4169 node = rb_first(root);
4170 while (node != NULL) {
4172 node = rb_next(tmp);
4173 tlink = rb_entry(tmp, struct tcon_link, tl_rbnode);
4175 if (test_bit(TCON_LINK_MASTER, &tlink->tl_flags) ||
4176 atomic_read(&tlink->tl_count) != 0 ||
4177 time_after(tlink->tl_time + TLINK_IDLE_EXPIRE, jiffies))
4180 cifs_get_tlink(tlink);
4181 clear_bit(TCON_LINK_IN_TREE, &tlink->tl_flags);
4182 rb_erase(tmp, root);
4184 spin_unlock(&cifs_sb->tlink_tree_lock);
4185 cifs_put_tlink(tlink);
4186 spin_lock(&cifs_sb->tlink_tree_lock);
4188 spin_unlock(&cifs_sb->tlink_tree_lock);
4190 queue_delayed_work(cifsiod_wq, &cifs_sb->prune_tlinks,