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/sched/signal.h>
25 #include <linux/list.h>
26 #include <linux/wait.h>
27 #include <linux/slab.h>
28 #include <linux/pagemap.h>
29 #include <linux/ctype.h>
30 #include <linux/utsname.h>
31 #include <linux/mempool.h>
32 #include <linux/delay.h>
33 #include <linux/completion.h>
34 #include <linux/kthread.h>
35 #include <linux/pagevec.h>
36 #include <linux/freezer.h>
37 #include <linux/namei.h>
38 #include <linux/uuid.h>
39 #include <linux/uaccess.h>
40 #include <asm/processor.h>
41 #include <linux/inet.h>
42 #include <linux/module.h>
43 #include <keys/user-type.h>
45 #include <linux/parser.h>
46 #include <linux/bvec.h>
50 #include "cifsproto.h"
51 #include "cifs_unicode.h"
52 #include "cifs_debug.h"
53 #include "cifs_fs_sb.h"
56 #include "rfc1002pdu.h"
58 #ifdef CONFIG_CIFS_SMB2
59 #include "smb2proto.h"
63 #define RFC1001_PORT 139
65 extern mempool_t *cifs_req_poolp;
67 /* FIXME: should these be tunable? */
68 #define TLINK_ERROR_EXPIRE (1 * HZ)
69 #define TLINK_IDLE_EXPIRE (600 * HZ)
72 /* Mount options that take no arguments */
73 Opt_user_xattr, Opt_nouser_xattr,
74 Opt_forceuid, Opt_noforceuid,
75 Opt_forcegid, Opt_noforcegid,
76 Opt_noblocksend, Opt_noautotune,
77 Opt_hard, Opt_soft, Opt_perm, Opt_noperm,
78 Opt_mapposix, Opt_nomapposix,
79 Opt_mapchars, Opt_nomapchars, Opt_sfu,
80 Opt_nosfu, Opt_nodfs, Opt_posixpaths,
81 Opt_noposixpaths, Opt_nounix,
84 Opt_forcemandatorylock, Opt_setuidfromacl, Opt_setuids,
85 Opt_nosetuids, Opt_dynperm, Opt_nodynperm,
86 Opt_nohard, Opt_nosoft,
88 Opt_nostrictsync, Opt_strictsync,
89 Opt_serverino, Opt_noserverino,
90 Opt_rwpidforward, Opt_cifsacl, Opt_nocifsacl,
91 Opt_acl, Opt_noacl, Opt_locallease,
92 Opt_sign, Opt_seal, Opt_noac,
93 Opt_fsc, Opt_mfsymlinks,
94 Opt_multiuser, Opt_sloppy, Opt_nosharesock,
95 Opt_persistent, Opt_nopersistent,
96 Opt_resilient, Opt_noresilient,
99 /* Mount options which take numeric value */
100 Opt_backupuid, Opt_backupgid, Opt_uid,
101 Opt_cruid, Opt_gid, Opt_file_mode,
102 Opt_dirmode, Opt_port,
103 Opt_rsize, Opt_wsize, Opt_actimeo,
104 Opt_echo_interval, Opt_max_credits,
107 /* Mount options which take string value */
108 Opt_user, Opt_pass, Opt_ip,
109 Opt_domain, Opt_srcaddr, Opt_iocharset,
110 Opt_netbiosname, Opt_servern,
111 Opt_ver, Opt_vers, Opt_sec, Opt_cache,
113 /* Mount options to be ignored */
116 /* Options which could be blank */
124 static const match_table_t cifs_mount_option_tokens = {
126 { Opt_user_xattr, "user_xattr" },
127 { Opt_nouser_xattr, "nouser_xattr" },
128 { Opt_forceuid, "forceuid" },
129 { Opt_noforceuid, "noforceuid" },
130 { Opt_forcegid, "forcegid" },
131 { Opt_noforcegid, "noforcegid" },
132 { Opt_noblocksend, "noblocksend" },
133 { Opt_noautotune, "noautotune" },
134 { Opt_hard, "hard" },
135 { Opt_soft, "soft" },
136 { Opt_perm, "perm" },
137 { Opt_noperm, "noperm" },
138 { Opt_mapchars, "mapchars" }, /* SFU style */
139 { Opt_nomapchars, "nomapchars" },
140 { Opt_mapposix, "mapposix" }, /* SFM style */
141 { Opt_nomapposix, "nomapposix" },
143 { Opt_nosfu, "nosfu" },
144 { Opt_nodfs, "nodfs" },
145 { Opt_posixpaths, "posixpaths" },
146 { Opt_noposixpaths, "noposixpaths" },
147 { Opt_nounix, "nounix" },
148 { Opt_nounix, "nolinux" },
149 { Opt_nocase, "nocase" },
150 { Opt_nocase, "ignorecase" },
152 { Opt_nobrl, "nobrl" },
153 { Opt_nobrl, "nolock" },
154 { Opt_forcemandatorylock, "forcemandatorylock" },
155 { Opt_forcemandatorylock, "forcemand" },
156 { Opt_setuids, "setuids" },
157 { Opt_nosetuids, "nosetuids" },
158 { Opt_setuidfromacl, "idsfromsid" },
159 { Opt_dynperm, "dynperm" },
160 { Opt_nodynperm, "nodynperm" },
161 { Opt_nohard, "nohard" },
162 { Opt_nosoft, "nosoft" },
163 { Opt_nointr, "nointr" },
164 { Opt_intr, "intr" },
165 { Opt_nostrictsync, "nostrictsync" },
166 { Opt_strictsync, "strictsync" },
167 { Opt_serverino, "serverino" },
168 { Opt_noserverino, "noserverino" },
169 { Opt_rwpidforward, "rwpidforward" },
170 { Opt_cifsacl, "cifsacl" },
171 { Opt_nocifsacl, "nocifsacl" },
173 { Opt_noacl, "noacl" },
174 { Opt_locallease, "locallease" },
175 { Opt_sign, "sign" },
176 { Opt_seal, "seal" },
177 { Opt_noac, "noac" },
179 { Opt_mfsymlinks, "mfsymlinks" },
180 { Opt_multiuser, "multiuser" },
181 { Opt_sloppy, "sloppy" },
182 { Opt_nosharesock, "nosharesock" },
183 { Opt_persistent, "persistenthandles"},
184 { Opt_nopersistent, "nopersistenthandles"},
185 { Opt_resilient, "resilienthandles"},
186 { Opt_noresilient, "noresilienthandles"},
187 { Opt_domainauto, "domainauto"},
189 { Opt_backupuid, "backupuid=%s" },
190 { Opt_backupgid, "backupgid=%s" },
191 { Opt_uid, "uid=%s" },
192 { Opt_cruid, "cruid=%s" },
193 { Opt_gid, "gid=%s" },
194 { Opt_file_mode, "file_mode=%s" },
195 { Opt_dirmode, "dirmode=%s" },
196 { Opt_dirmode, "dir_mode=%s" },
197 { Opt_port, "port=%s" },
198 { Opt_rsize, "rsize=%s" },
199 { Opt_wsize, "wsize=%s" },
200 { Opt_actimeo, "actimeo=%s" },
201 { Opt_echo_interval, "echo_interval=%s" },
202 { Opt_max_credits, "max_credits=%s" },
203 { Opt_snapshot, "snapshot=%s" },
205 { Opt_blank_user, "user=" },
206 { Opt_blank_user, "username=" },
207 { Opt_user, "user=%s" },
208 { Opt_user, "username=%s" },
209 { Opt_blank_pass, "pass=" },
210 { Opt_blank_pass, "password=" },
211 { Opt_pass, "pass=%s" },
212 { Opt_pass, "password=%s" },
213 { Opt_blank_ip, "ip=" },
214 { Opt_blank_ip, "addr=" },
216 { Opt_ip, "addr=%s" },
217 { Opt_ignore, "unc=%s" },
218 { Opt_ignore, "target=%s" },
219 { Opt_ignore, "path=%s" },
220 { Opt_domain, "dom=%s" },
221 { Opt_domain, "domain=%s" },
222 { Opt_domain, "workgroup=%s" },
223 { Opt_srcaddr, "srcaddr=%s" },
224 { Opt_ignore, "prefixpath=%s" },
225 { Opt_iocharset, "iocharset=%s" },
226 { Opt_netbiosname, "netbiosname=%s" },
227 { Opt_servern, "servern=%s" },
228 { Opt_ver, "ver=%s" },
229 { Opt_vers, "vers=%s" },
230 { Opt_sec, "sec=%s" },
231 { Opt_cache, "cache=%s" },
233 { Opt_ignore, "cred" },
234 { Opt_ignore, "credentials" },
235 { Opt_ignore, "cred=%s" },
236 { Opt_ignore, "credentials=%s" },
237 { Opt_ignore, "guest" },
238 { Opt_ignore, "rw" },
239 { Opt_ignore, "ro" },
240 { Opt_ignore, "suid" },
241 { Opt_ignore, "nosuid" },
242 { Opt_ignore, "exec" },
243 { Opt_ignore, "noexec" },
244 { Opt_ignore, "nodev" },
245 { Opt_ignore, "noauto" },
246 { Opt_ignore, "dev" },
247 { Opt_ignore, "mand" },
248 { Opt_ignore, "nomand" },
249 { Opt_ignore, "_netdev" },
255 Opt_sec_krb5, Opt_sec_krb5i, Opt_sec_krb5p,
256 Opt_sec_ntlmsspi, Opt_sec_ntlmssp,
257 Opt_ntlm, Opt_sec_ntlmi, Opt_sec_ntlmv2,
258 Opt_sec_ntlmv2i, Opt_sec_lanman,
264 static const match_table_t cifs_secflavor_tokens = {
265 { Opt_sec_krb5, "krb5" },
266 { Opt_sec_krb5i, "krb5i" },
267 { Opt_sec_krb5p, "krb5p" },
268 { Opt_sec_ntlmsspi, "ntlmsspi" },
269 { Opt_sec_ntlmssp, "ntlmssp" },
270 { Opt_ntlm, "ntlm" },
271 { Opt_sec_ntlmi, "ntlmi" },
272 { Opt_sec_ntlmv2, "nontlm" },
273 { Opt_sec_ntlmv2, "ntlmv2" },
274 { Opt_sec_ntlmv2i, "ntlmv2i" },
275 { Opt_sec_lanman, "lanman" },
276 { Opt_sec_none, "none" },
278 { Opt_sec_err, NULL }
289 static const match_table_t cifs_cacheflavor_tokens = {
290 { Opt_cache_loose, "loose" },
291 { Opt_cache_strict, "strict" },
292 { Opt_cache_none, "none" },
293 { Opt_cache_err, NULL }
296 static const match_table_t cifs_smb_version_tokens = {
297 { Smb_1, SMB1_VERSION_STRING },
298 { Smb_20, SMB20_VERSION_STRING},
299 { Smb_21, SMB21_VERSION_STRING },
300 { Smb_30, SMB30_VERSION_STRING },
301 { Smb_302, SMB302_VERSION_STRING },
302 #ifdef CONFIG_CIFS_SMB311
303 { Smb_311, SMB311_VERSION_STRING },
304 { Smb_311, ALT_SMB311_VERSION_STRING },
306 { Smb_version_err, NULL }
309 static int ip_connect(struct TCP_Server_Info *server);
310 static int generic_ip_connect(struct TCP_Server_Info *server);
311 static void tlink_rb_insert(struct rb_root *root, struct tcon_link *new_tlink);
312 static void cifs_prune_tlinks(struct work_struct *work);
313 static int cifs_setup_volume_info(struct smb_vol *volume_info, char *mount_data,
314 const char *devname);
317 * cifs tcp session reconnection
319 * mark tcp session as reconnecting so temporarily locked
320 * mark all smb sessions as reconnecting for tcp session
321 * reconnect tcp session
322 * wake up waiters on reconnection? - (not needed currently)
325 cifs_reconnect(struct TCP_Server_Info *server)
328 struct list_head *tmp, *tmp2;
329 struct cifs_ses *ses;
330 struct cifs_tcon *tcon;
331 struct mid_q_entry *mid_entry;
332 struct list_head retry_list;
334 spin_lock(&GlobalMid_Lock);
335 if (server->tcpStatus == CifsExiting) {
336 /* the demux thread will exit normally
337 next time through the loop */
338 spin_unlock(&GlobalMid_Lock);
341 server->tcpStatus = CifsNeedReconnect;
342 spin_unlock(&GlobalMid_Lock);
344 #ifdef CONFIG_CIFS_SMB2
345 server->max_read = 0;
348 cifs_dbg(FYI, "Reconnecting tcp session\n");
350 /* before reconnecting the tcp session, mark the smb session (uid)
351 and the tid bad so they are not used until reconnected */
352 cifs_dbg(FYI, "%s: marking sessions and tcons for reconnect\n",
354 spin_lock(&cifs_tcp_ses_lock);
355 list_for_each(tmp, &server->smb_ses_list) {
356 ses = list_entry(tmp, struct cifs_ses, smb_ses_list);
357 ses->need_reconnect = true;
359 list_for_each(tmp2, &ses->tcon_list) {
360 tcon = list_entry(tmp2, struct cifs_tcon, tcon_list);
361 tcon->need_reconnect = true;
364 spin_unlock(&cifs_tcp_ses_lock);
366 /* do not want to be sending data on a socket we are freeing */
367 cifs_dbg(FYI, "%s: tearing down socket\n", __func__);
368 mutex_lock(&server->srv_mutex);
369 if (server->ssocket) {
370 cifs_dbg(FYI, "State: 0x%x Flags: 0x%lx\n",
371 server->ssocket->state, server->ssocket->flags);
372 kernel_sock_shutdown(server->ssocket, SHUT_WR);
373 cifs_dbg(FYI, "Post shutdown state: 0x%x Flags: 0x%lx\n",
374 server->ssocket->state, server->ssocket->flags);
375 sock_release(server->ssocket);
376 server->ssocket = NULL;
378 server->sequence_number = 0;
379 server->session_estab = false;
380 kfree(server->session_key.response);
381 server->session_key.response = NULL;
382 server->session_key.len = 0;
383 server->lstrp = jiffies;
385 /* mark submitted MIDs for retry and issue callback */
386 INIT_LIST_HEAD(&retry_list);
387 cifs_dbg(FYI, "%s: moving mids to private list\n", __func__);
388 spin_lock(&GlobalMid_Lock);
389 list_for_each_safe(tmp, tmp2, &server->pending_mid_q) {
390 mid_entry = list_entry(tmp, struct mid_q_entry, qhead);
391 if (mid_entry->mid_state == MID_REQUEST_SUBMITTED)
392 mid_entry->mid_state = MID_RETRY_NEEDED;
393 list_move(&mid_entry->qhead, &retry_list);
395 spin_unlock(&GlobalMid_Lock);
396 mutex_unlock(&server->srv_mutex);
398 cifs_dbg(FYI, "%s: issuing mid callbacks\n", __func__);
399 list_for_each_safe(tmp, tmp2, &retry_list) {
400 mid_entry = list_entry(tmp, struct mid_q_entry, qhead);
401 list_del_init(&mid_entry->qhead);
402 mid_entry->callback(mid_entry);
408 /* we should try only the port we connected to before */
409 mutex_lock(&server->srv_mutex);
410 rc = generic_ip_connect(server);
412 cifs_dbg(FYI, "reconnect error %d\n", rc);
413 mutex_unlock(&server->srv_mutex);
416 atomic_inc(&tcpSesReconnectCount);
417 spin_lock(&GlobalMid_Lock);
418 if (server->tcpStatus != CifsExiting)
419 server->tcpStatus = CifsNeedNegotiate;
420 spin_unlock(&GlobalMid_Lock);
421 mutex_unlock(&server->srv_mutex);
423 } while (server->tcpStatus == CifsNeedReconnect);
425 if (server->tcpStatus == CifsNeedNegotiate)
426 mod_delayed_work(cifsiod_wq, &server->echo, 0);
432 cifs_echo_request(struct work_struct *work)
435 struct TCP_Server_Info *server = container_of(work,
436 struct TCP_Server_Info, echo.work);
437 unsigned long echo_interval;
440 * If we need to renegotiate, set echo interval to zero to
441 * immediately call echo service where we can renegotiate.
443 if (server->tcpStatus == CifsNeedNegotiate)
446 echo_interval = server->echo_interval;
449 * We cannot send an echo if it is disabled.
450 * Also, no need to ping if we got a response recently.
453 if (server->tcpStatus == CifsNeedReconnect ||
454 server->tcpStatus == CifsExiting ||
455 server->tcpStatus == CifsNew ||
456 (server->ops->can_echo && !server->ops->can_echo(server)) ||
457 time_before(jiffies, server->lstrp + echo_interval - HZ))
460 rc = server->ops->echo ? server->ops->echo(server) : -ENOSYS;
462 cifs_dbg(FYI, "Unable to send echo request to server: %s\n",
466 queue_delayed_work(cifsiod_wq, &server->echo, server->echo_interval);
470 allocate_buffers(struct TCP_Server_Info *server)
472 if (!server->bigbuf) {
473 server->bigbuf = (char *)cifs_buf_get();
474 if (!server->bigbuf) {
475 cifs_dbg(VFS, "No memory for large SMB response\n");
477 /* retry will check if exiting */
480 } else if (server->large_buf) {
481 /* we are reusing a dirty large buf, clear its start */
482 memset(server->bigbuf, 0, HEADER_SIZE(server));
485 if (!server->smallbuf) {
486 server->smallbuf = (char *)cifs_small_buf_get();
487 if (!server->smallbuf) {
488 cifs_dbg(VFS, "No memory for SMB response\n");
490 /* retry will check if exiting */
493 /* beginning of smb buffer is cleared in our buf_get */
495 /* if existing small buf clear beginning */
496 memset(server->smallbuf, 0, HEADER_SIZE(server));
503 server_unresponsive(struct TCP_Server_Info *server)
506 * We need to wait 2 echo intervals to make sure we handle such
508 * 1s client sends a normal SMB request
509 * 2s client gets a response
510 * 30s echo workqueue job pops, and decides we got a response recently
511 * and don't need to send another
513 * 65s kernel_recvmsg times out, and we see that we haven't gotten
514 * a response in >60s.
516 if (server->tcpStatus == CifsGood &&
517 time_after(jiffies, server->lstrp + 2 * server->echo_interval)) {
518 cifs_dbg(VFS, "Server %s has not responded in %lu seconds. Reconnecting...\n",
519 server->hostname, (2 * server->echo_interval) / HZ);
520 cifs_reconnect(server);
521 wake_up(&server->response_q);
529 cifs_readv_from_socket(struct TCP_Server_Info *server, struct msghdr *smb_msg)
534 smb_msg->msg_control = NULL;
535 smb_msg->msg_controllen = 0;
537 for (total_read = 0; msg_data_left(smb_msg); total_read += length) {
540 if (server_unresponsive(server))
541 return -ECONNABORTED;
543 length = sock_recvmsg(server->ssocket, smb_msg, 0);
545 if (server->tcpStatus == CifsExiting)
548 if (server->tcpStatus == CifsNeedReconnect) {
549 cifs_reconnect(server);
550 return -ECONNABORTED;
553 if (length == -ERESTARTSYS ||
557 * Minimum sleep to prevent looping, allowing socket
558 * to clear and app threads to set tcpStatus
559 * CifsNeedReconnect if server hung.
561 usleep_range(1000, 2000);
567 cifs_dbg(FYI, "Received no data or error: %d\n", length);
568 cifs_reconnect(server);
569 return -ECONNABORTED;
576 cifs_read_from_socket(struct TCP_Server_Info *server, char *buf,
577 unsigned int to_read)
579 struct msghdr smb_msg;
580 struct kvec iov = {.iov_base = buf, .iov_len = to_read};
581 iov_iter_kvec(&smb_msg.msg_iter, READ | ITER_KVEC, &iov, 1, to_read);
583 return cifs_readv_from_socket(server, &smb_msg);
587 cifs_read_page_from_socket(struct TCP_Server_Info *server, struct page *page,
588 unsigned int to_read)
590 struct msghdr smb_msg;
591 struct bio_vec bv = {.bv_page = page, .bv_len = to_read};
592 iov_iter_bvec(&smb_msg.msg_iter, READ | ITER_BVEC, &bv, 1, to_read);
593 return cifs_readv_from_socket(server, &smb_msg);
597 is_smb_response(struct TCP_Server_Info *server, unsigned char type)
600 * The first byte big endian of the length field,
601 * is actually not part of the length but the type
602 * with the most common, zero, as regular data.
605 case RFC1002_SESSION_MESSAGE:
606 /* Regular SMB response */
608 case RFC1002_SESSION_KEEP_ALIVE:
609 cifs_dbg(FYI, "RFC 1002 session keep alive\n");
611 case RFC1002_POSITIVE_SESSION_RESPONSE:
612 cifs_dbg(FYI, "RFC 1002 positive session response\n");
614 case RFC1002_NEGATIVE_SESSION_RESPONSE:
616 * We get this from Windows 98 instead of an error on
617 * SMB negprot response.
619 cifs_dbg(FYI, "RFC 1002 negative session response\n");
620 /* give server a second to clean up */
623 * Always try 445 first on reconnect since we get NACK
624 * on some if we ever connected to port 139 (the NACK
625 * is since we do not begin with RFC1001 session
628 cifs_set_port((struct sockaddr *)&server->dstaddr, CIFS_PORT);
629 cifs_reconnect(server);
630 wake_up(&server->response_q);
633 cifs_dbg(VFS, "RFC 1002 unknown response type 0x%x\n", type);
634 cifs_reconnect(server);
641 dequeue_mid(struct mid_q_entry *mid, bool malformed)
643 #ifdef CONFIG_CIFS_STATS2
644 mid->when_received = jiffies;
646 spin_lock(&GlobalMid_Lock);
648 mid->mid_state = MID_RESPONSE_RECEIVED;
650 mid->mid_state = MID_RESPONSE_MALFORMED;
651 list_del_init(&mid->qhead);
652 spin_unlock(&GlobalMid_Lock);
656 handle_mid(struct mid_q_entry *mid, struct TCP_Server_Info *server,
657 char *buf, int malformed)
659 if (server->ops->check_trans2 &&
660 server->ops->check_trans2(mid, server, buf, malformed))
663 mid->large_buf = server->large_buf;
664 /* Was previous buf put in mpx struct for multi-rsp? */
665 if (!mid->multiRsp) {
666 /* smb buffer will be freed by user thread */
667 if (server->large_buf)
668 server->bigbuf = NULL;
670 server->smallbuf = NULL;
672 dequeue_mid(mid, malformed);
675 static void clean_demultiplex_info(struct TCP_Server_Info *server)
679 /* take it off the list, if it's not already */
680 spin_lock(&cifs_tcp_ses_lock);
681 list_del_init(&server->tcp_ses_list);
682 spin_unlock(&cifs_tcp_ses_lock);
684 spin_lock(&GlobalMid_Lock);
685 server->tcpStatus = CifsExiting;
686 spin_unlock(&GlobalMid_Lock);
687 wake_up_all(&server->response_q);
689 /* check if we have blocked requests that need to free */
690 spin_lock(&server->req_lock);
691 if (server->credits <= 0)
693 spin_unlock(&server->req_lock);
695 * Although there should not be any requests blocked on this queue it
696 * can not hurt to be paranoid and try to wake up requests that may
697 * haven been blocked when more than 50 at time were on the wire to the
698 * same server - they now will see the session is in exit state and get
699 * out of SendReceive.
701 wake_up_all(&server->request_q);
702 /* give those requests time to exit */
705 if (server->ssocket) {
706 sock_release(server->ssocket);
707 server->ssocket = NULL;
710 if (!list_empty(&server->pending_mid_q)) {
711 struct list_head dispose_list;
712 struct mid_q_entry *mid_entry;
713 struct list_head *tmp, *tmp2;
715 INIT_LIST_HEAD(&dispose_list);
716 spin_lock(&GlobalMid_Lock);
717 list_for_each_safe(tmp, tmp2, &server->pending_mid_q) {
718 mid_entry = list_entry(tmp, struct mid_q_entry, qhead);
719 cifs_dbg(FYI, "Clearing mid 0x%llx\n", mid_entry->mid);
720 mid_entry->mid_state = MID_SHUTDOWN;
721 list_move(&mid_entry->qhead, &dispose_list);
723 spin_unlock(&GlobalMid_Lock);
725 /* now walk dispose list and issue callbacks */
726 list_for_each_safe(tmp, tmp2, &dispose_list) {
727 mid_entry = list_entry(tmp, struct mid_q_entry, qhead);
728 cifs_dbg(FYI, "Callback mid 0x%llx\n", mid_entry->mid);
729 list_del_init(&mid_entry->qhead);
730 mid_entry->callback(mid_entry);
732 /* 1/8th of sec is more than enough time for them to exit */
736 if (!list_empty(&server->pending_mid_q)) {
738 * mpx threads have not exited yet give them at least the smb
739 * send timeout time for long ops.
741 * Due to delays on oplock break requests, we need to wait at
742 * least 45 seconds before giving up on a request getting a
743 * response and going ahead and killing cifsd.
745 cifs_dbg(FYI, "Wait for exit from demultiplex thread\n");
748 * If threads still have not exited they are probably never
749 * coming home not much else we can do but free the memory.
753 kfree(server->hostname);
756 length = atomic_dec_return(&tcpSesAllocCount);
758 mempool_resize(cifs_req_poolp, length + cifs_min_rcv);
762 standard_receive3(struct TCP_Server_Info *server, struct mid_q_entry *mid)
765 char *buf = server->smallbuf;
766 unsigned int pdu_length = get_rfc1002_length(buf);
768 /* make sure this will fit in a large buffer */
769 if (pdu_length > CIFSMaxBufSize + MAX_HEADER_SIZE(server) - 4) {
770 cifs_dbg(VFS, "SMB response too long (%u bytes)\n", pdu_length);
771 cifs_reconnect(server);
772 wake_up(&server->response_q);
773 return -ECONNABORTED;
776 /* switch to large buffer if too big for a small one */
777 if (pdu_length > MAX_CIFS_SMALL_BUFFER_SIZE - 4) {
778 server->large_buf = true;
779 memcpy(server->bigbuf, buf, server->total_read);
780 buf = server->bigbuf;
783 /* now read the rest */
784 length = cifs_read_from_socket(server, buf + HEADER_SIZE(server) - 1,
785 pdu_length - HEADER_SIZE(server) + 1 + 4);
788 server->total_read += length;
790 dump_smb(buf, server->total_read);
792 return cifs_handle_standard(server, mid);
796 cifs_handle_standard(struct TCP_Server_Info *server, struct mid_q_entry *mid)
798 char *buf = server->large_buf ? server->bigbuf : server->smallbuf;
802 * We know that we received enough to get to the MID as we
803 * checked the pdu_length earlier. Now check to see
804 * if the rest of the header is OK. We borrow the length
805 * var for the rest of the loop to avoid a new stack var.
807 * 48 bytes is enough to display the header and a little bit
808 * into the payload for debugging purposes.
810 length = server->ops->check_message(buf, server->total_read, server);
812 cifs_dump_mem("Bad SMB: ", buf,
813 min_t(unsigned int, server->total_read, 48));
815 if (server->ops->is_status_pending &&
816 server->ops->is_status_pending(buf, server, length))
822 handle_mid(mid, server, buf, length);
827 cifs_demultiplex_thread(void *p)
830 struct TCP_Server_Info *server = p;
831 unsigned int pdu_length;
833 struct task_struct *task_to_wake = NULL;
834 struct mid_q_entry *mid_entry;
836 current->flags |= PF_MEMALLOC;
837 cifs_dbg(FYI, "Demultiplex PID: %d\n", task_pid_nr(current));
839 length = atomic_inc_return(&tcpSesAllocCount);
841 mempool_resize(cifs_req_poolp, length + cifs_min_rcv);
844 while (server->tcpStatus != CifsExiting) {
848 if (!allocate_buffers(server))
851 server->large_buf = false;
852 buf = server->smallbuf;
853 pdu_length = 4; /* enough to get RFC1001 header */
855 length = cifs_read_from_socket(server, buf, pdu_length);
858 server->total_read = length;
861 * The right amount was read from socket - 4 bytes,
862 * so we can now interpret the length field.
864 pdu_length = get_rfc1002_length(buf);
866 cifs_dbg(FYI, "RFC1002 header 0x%x\n", pdu_length);
867 if (!is_smb_response(server, buf[0]))
870 /* make sure we have enough to get to the MID */
871 if (pdu_length < HEADER_SIZE(server) - 1 - 4) {
872 cifs_dbg(VFS, "SMB response too short (%u bytes)\n",
874 cifs_reconnect(server);
875 wake_up(&server->response_q);
879 /* read down to the MID */
880 length = cifs_read_from_socket(server, buf + 4,
881 HEADER_SIZE(server) - 1 - 4);
884 server->total_read += length;
886 if (server->ops->is_transform_hdr &&
887 server->ops->receive_transform &&
888 server->ops->is_transform_hdr(buf)) {
889 length = server->ops->receive_transform(server,
892 mid_entry = server->ops->find_mid(server, buf);
894 if (!mid_entry || !mid_entry->receive)
895 length = standard_receive3(server, mid_entry);
897 length = mid_entry->receive(server, mid_entry);
903 if (server->large_buf)
904 buf = server->bigbuf;
906 server->lstrp = jiffies;
907 if (mid_entry != NULL) {
908 if ((mid_entry->mid_flags & MID_WAIT_CANCELLED) &&
909 mid_entry->mid_state == MID_RESPONSE_RECEIVED &&
910 server->ops->handle_cancelled_mid)
911 server->ops->handle_cancelled_mid(
915 if (!mid_entry->multiRsp || mid_entry->multiEnd)
916 mid_entry->callback(mid_entry);
917 } else if (server->ops->is_oplock_break &&
918 server->ops->is_oplock_break(buf, server)) {
919 cifs_dbg(FYI, "Received oplock break\n");
921 cifs_dbg(VFS, "No task to wake, unknown frame received! NumMids %d\n",
922 atomic_read(&midCount));
923 cifs_dump_mem("Received Data is: ", buf,
924 HEADER_SIZE(server));
925 #ifdef CONFIG_CIFS_DEBUG2
926 if (server->ops->dump_detail)
927 server->ops->dump_detail(buf);
928 cifs_dump_mids(server);
929 #endif /* CIFS_DEBUG2 */
932 } /* end while !EXITING */
934 /* buffer usually freed in free_mid - need to free it here on exit */
935 cifs_buf_release(server->bigbuf);
936 if (server->smallbuf) /* no sense logging a debug message if NULL */
937 cifs_small_buf_release(server->smallbuf);
939 task_to_wake = xchg(&server->tsk, NULL);
940 clean_demultiplex_info(server);
942 /* if server->tsk was NULL then wait for a signal before exiting */
944 set_current_state(TASK_INTERRUPTIBLE);
945 while (!signal_pending(current)) {
947 set_current_state(TASK_INTERRUPTIBLE);
949 set_current_state(TASK_RUNNING);
952 module_put_and_exit(0);
955 /* extract the host portion of the UNC string */
957 extract_hostname(const char *unc)
963 /* skip double chars at beginning of string */
964 /* BB: check validity of these bytes? */
967 /* delimiter between hostname and sharename is always '\\' now */
968 delim = strchr(src, '\\');
970 return ERR_PTR(-EINVAL);
973 dst = kmalloc((len + 1), GFP_KERNEL);
975 return ERR_PTR(-ENOMEM);
977 memcpy(dst, src, len);
983 static int get_option_ul(substring_t args[], unsigned long *option)
988 string = match_strdup(args);
991 rc = kstrtoul(string, 0, option);
997 static int get_option_uid(substring_t args[], kuid_t *result)
1003 rc = get_option_ul(args, &value);
1007 uid = make_kuid(current_user_ns(), value);
1008 if (!uid_valid(uid))
1015 static int get_option_gid(substring_t args[], kgid_t *result)
1017 unsigned long value;
1021 rc = get_option_ul(args, &value);
1025 gid = make_kgid(current_user_ns(), value);
1026 if (!gid_valid(gid))
1033 static int cifs_parse_security_flavors(char *value,
1034 struct smb_vol *vol)
1037 substring_t args[MAX_OPT_ARGS];
1040 * With mount options, the last one should win. Reset any existing
1041 * settings back to default.
1043 vol->sectype = Unspecified;
1046 switch (match_token(value, cifs_secflavor_tokens, args)) {
1048 cifs_dbg(VFS, "sec=krb5p is not supported!\n");
1054 vol->sectype = Kerberos;
1056 case Opt_sec_ntlmsspi:
1059 case Opt_sec_ntlmssp:
1060 vol->sectype = RawNTLMSSP;
1066 vol->sectype = NTLM;
1068 case Opt_sec_ntlmv2i:
1071 case Opt_sec_ntlmv2:
1072 vol->sectype = NTLMv2;
1074 #ifdef CONFIG_CIFS_WEAK_PW_HASH
1075 case Opt_sec_lanman:
1076 vol->sectype = LANMAN;
1083 cifs_dbg(VFS, "bad security option: %s\n", value);
1091 cifs_parse_cache_flavor(char *value, struct smb_vol *vol)
1093 substring_t args[MAX_OPT_ARGS];
1095 switch (match_token(value, cifs_cacheflavor_tokens, args)) {
1096 case Opt_cache_loose:
1097 vol->direct_io = false;
1098 vol->strict_io = false;
1100 case Opt_cache_strict:
1101 vol->direct_io = false;
1102 vol->strict_io = true;
1104 case Opt_cache_none:
1105 vol->direct_io = true;
1106 vol->strict_io = false;
1109 cifs_dbg(VFS, "bad cache= option: %s\n", value);
1116 cifs_parse_smb_version(char *value, struct smb_vol *vol)
1118 substring_t args[MAX_OPT_ARGS];
1120 switch (match_token(value, cifs_smb_version_tokens, args)) {
1122 vol->ops = &smb1_operations;
1123 vol->vals = &smb1_values;
1125 #ifdef CONFIG_CIFS_SMB2
1127 vol->ops = &smb20_operations;
1128 vol->vals = &smb20_values;
1131 vol->ops = &smb21_operations;
1132 vol->vals = &smb21_values;
1135 vol->ops = &smb30_operations;
1136 vol->vals = &smb30_values;
1139 vol->ops = &smb30_operations; /* currently identical with 3.0 */
1140 vol->vals = &smb302_values;
1142 #ifdef CONFIG_CIFS_SMB311
1144 vol->ops = &smb311_operations;
1145 vol->vals = &smb311_values;
1150 cifs_dbg(VFS, "Unknown vers= option specified: %s\n", value);
1157 * Parse a devname into substrings and populate the vol->UNC and vol->prepath
1158 * fields with the result. Returns 0 on success and an error otherwise.
1161 cifs_parse_devname(const char *devname, struct smb_vol *vol)
1164 const char *delims = "/\\";
1167 /* make sure we have a valid UNC double delimiter prefix */
1168 len = strspn(devname, delims);
1172 /* find delimiter between host and sharename */
1173 pos = strpbrk(devname + 2, delims);
1177 /* skip past delimiter */
1180 /* now go until next delimiter or end of string */
1181 len = strcspn(pos, delims);
1183 /* move "pos" up to delimiter or NULL */
1185 vol->UNC = kstrndup(devname, pos - devname, GFP_KERNEL);
1189 convert_delimiter(vol->UNC, '\\');
1191 /* skip any delimiter */
1192 if (*pos == '/' || *pos == '\\')
1195 /* If pos is NULL then no prepath */
1199 vol->prepath = kstrdup(pos, GFP_KERNEL);
1207 cifs_parse_mount_options(const char *mountdata, const char *devname,
1208 struct smb_vol *vol)
1211 char *mountdata_copy = NULL, *options;
1212 unsigned int temp_len, i, j;
1214 short int override_uid = -1;
1215 short int override_gid = -1;
1216 bool uid_specified = false;
1217 bool gid_specified = false;
1218 bool sloppy = false;
1219 char *invalid = NULL;
1220 char *nodename = utsname()->nodename;
1221 char *string = NULL;
1222 char *tmp_end, *value;
1224 bool got_ip = false;
1225 unsigned short port = 0;
1226 struct sockaddr *dstaddr = (struct sockaddr *)&vol->dstaddr;
1230 delim = separator[0];
1232 /* ensure we always start with zeroed-out smb_vol */
1233 memset(vol, 0, sizeof(*vol));
1236 * does not have to be perfect mapping since field is
1237 * informational, only used for servers that do not support
1238 * port 445 and it can be overridden at mount time
1240 memset(vol->source_rfc1001_name, 0x20, RFC1001_NAME_LEN);
1241 for (i = 0; i < strnlen(nodename, RFC1001_NAME_LEN); i++)
1242 vol->source_rfc1001_name[i] = toupper(nodename[i]);
1244 vol->source_rfc1001_name[RFC1001_NAME_LEN] = 0;
1245 /* null target name indicates to use *SMBSERVR default called name
1246 if we end up sending RFC1001 session initialize */
1247 vol->target_rfc1001_name[0] = 0;
1248 vol->cred_uid = current_uid();
1249 vol->linux_uid = current_uid();
1250 vol->linux_gid = current_gid();
1253 * default to SFM style remapping of seven reserved characters
1254 * unless user overrides it or we negotiate CIFS POSIX where
1255 * it is unnecessary. Can not simultaneously use more than one mapping
1256 * since then readdir could list files that open could not open
1260 /* default to only allowing write access to owner of the mount */
1261 vol->dir_mode = vol->file_mode = S_IRUGO | S_IXUGO | S_IWUSR;
1263 /* vol->retry default is 0 (i.e. "soft" limited retry not hard retry) */
1264 /* default is always to request posix paths. */
1265 vol->posix_paths = 1;
1266 /* default to using server inode numbers where available */
1267 vol->server_ino = 1;
1269 /* default is to use strict cifs caching semantics */
1270 vol->strict_io = true;
1272 vol->actimeo = CIFS_DEF_ACTIMEO;
1274 /* FIXME: add autonegotiation -- for now, SMB1 is default */
1275 vol->ops = &smb1_operations;
1276 vol->vals = &smb1_values;
1278 vol->echo_interval = SMB_ECHO_INTERVAL_DEFAULT;
1281 goto cifs_parse_mount_err;
1283 mountdata_copy = kstrndup(mountdata, PAGE_SIZE, GFP_KERNEL);
1284 if (!mountdata_copy)
1285 goto cifs_parse_mount_err;
1287 options = mountdata_copy;
1288 end = options + strlen(options);
1290 if (strncmp(options, "sep=", 4) == 0) {
1291 if (options[4] != 0) {
1292 separator[0] = options[4];
1295 cifs_dbg(FYI, "Null separator not allowed\n");
1298 vol->backupuid_specified = false; /* no backup intent for a user */
1299 vol->backupgid_specified = false; /* no backup intent for a group */
1301 switch (cifs_parse_devname(devname, vol)) {
1305 cifs_dbg(VFS, "Unable to allocate memory for devname.\n");
1306 goto cifs_parse_mount_err;
1308 cifs_dbg(VFS, "Malformed UNC in devname.\n");
1309 goto cifs_parse_mount_err;
1311 cifs_dbg(VFS, "Unknown error parsing devname.\n");
1312 goto cifs_parse_mount_err;
1315 while ((data = strsep(&options, separator)) != NULL) {
1316 substring_t args[MAX_OPT_ARGS];
1317 unsigned long option;
1323 token = match_token(data, cifs_mount_option_tokens, args);
1327 /* Ingnore the following */
1331 /* Boolean values */
1332 case Opt_user_xattr:
1335 case Opt_nouser_xattr:
1341 case Opt_noforceuid:
1347 case Opt_noforcegid:
1350 case Opt_noblocksend:
1351 vol->noblocksnd = 1;
1353 case Opt_noautotune:
1354 vol->noautotune = 1;
1369 vol->sfu_remap = true;
1370 vol->remap = false; /* disable SFM mapping */
1372 case Opt_nomapchars:
1373 vol->sfu_remap = false;
1377 vol->sfu_remap = false; /* disable SFU mapping */
1379 case Opt_nomapposix:
1391 case Opt_posixpaths:
1392 vol->posix_paths = 1;
1394 case Opt_noposixpaths:
1395 vol->posix_paths = 0;
1398 vol->no_linux_ext = 1;
1409 * turn off mandatory locking in mode
1410 * if remote locking is turned off since the
1411 * local vfs will do advisory
1413 if (vol->file_mode ==
1414 (S_IALLUGO & ~(S_ISUID | S_IXGRP)))
1415 vol->file_mode = S_IALLUGO;
1417 case Opt_forcemandatorylock:
1426 case Opt_setuidfromacl:
1427 vol->setuidfromacl = 1;
1430 vol->dynperm = true;
1433 vol->dynperm = false;
1447 case Opt_nostrictsync:
1448 vol->nostrictsync = 1;
1450 case Opt_strictsync:
1451 vol->nostrictsync = 0;
1454 vol->server_ino = 1;
1456 case Opt_noserverino:
1457 vol->server_ino = 0;
1459 case Opt_rwpidforward:
1460 vol->rwpidforward = 1;
1469 vol->no_psx_acl = 0;
1472 vol->no_psx_acl = 1;
1474 case Opt_locallease:
1475 vol->local_lease = 1;
1481 /* we do not do the following in secFlags because seal
1482 * is a per tree connection (mount) not a per socket
1483 * or per-smb connection option in the protocol
1484 * vol->secFlg |= CIFSSEC_MUST_SEAL;
1489 pr_warn("CIFS: Mount option noac not supported. Instead set /proc/fs/cifs/LookupCacheEnabled to 0\n");
1492 #ifndef CONFIG_CIFS_FSCACHE
1493 cifs_dbg(VFS, "FS-Cache support needs CONFIG_CIFS_FSCACHE kernel config option set\n");
1494 goto cifs_parse_mount_err;
1498 case Opt_mfsymlinks:
1499 vol->mfsymlinks = true;
1502 vol->multiuser = true;
1507 case Opt_nosharesock:
1508 vol->nosharesock = true;
1510 case Opt_nopersistent:
1511 vol->nopersistent = true;
1512 if (vol->persistent) {
1514 "persistenthandles mount options conflict\n");
1515 goto cifs_parse_mount_err;
1518 case Opt_persistent:
1519 vol->persistent = true;
1520 if ((vol->nopersistent) || (vol->resilient)) {
1522 "persistenthandles mount options conflict\n");
1523 goto cifs_parse_mount_err;
1527 vol->resilient = true;
1528 if (vol->persistent) {
1530 "persistenthandles mount options conflict\n");
1531 goto cifs_parse_mount_err;
1534 case Opt_noresilient:
1535 vol->resilient = false; /* already the default */
1537 case Opt_domainauto:
1538 vol->domainauto = true;
1541 /* Numeric Values */
1543 if (get_option_uid(args, &vol->backupuid)) {
1544 cifs_dbg(VFS, "%s: Invalid backupuid value\n",
1546 goto cifs_parse_mount_err;
1548 vol->backupuid_specified = true;
1551 if (get_option_gid(args, &vol->backupgid)) {
1552 cifs_dbg(VFS, "%s: Invalid backupgid value\n",
1554 goto cifs_parse_mount_err;
1556 vol->backupgid_specified = true;
1559 if (get_option_uid(args, &vol->linux_uid)) {
1560 cifs_dbg(VFS, "%s: Invalid uid value\n",
1562 goto cifs_parse_mount_err;
1564 uid_specified = true;
1567 if (get_option_uid(args, &vol->cred_uid)) {
1568 cifs_dbg(VFS, "%s: Invalid cruid value\n",
1570 goto cifs_parse_mount_err;
1574 if (get_option_gid(args, &vol->linux_gid)) {
1575 cifs_dbg(VFS, "%s: Invalid gid value\n",
1577 goto cifs_parse_mount_err;
1579 gid_specified = true;
1582 if (get_option_ul(args, &option)) {
1583 cifs_dbg(VFS, "%s: Invalid file_mode value\n",
1585 goto cifs_parse_mount_err;
1587 vol->file_mode = option;
1590 if (get_option_ul(args, &option)) {
1591 cifs_dbg(VFS, "%s: Invalid dir_mode value\n",
1593 goto cifs_parse_mount_err;
1595 vol->dir_mode = option;
1598 if (get_option_ul(args, &option) ||
1599 option > USHRT_MAX) {
1600 cifs_dbg(VFS, "%s: Invalid port value\n",
1602 goto cifs_parse_mount_err;
1604 port = (unsigned short)option;
1607 if (get_option_ul(args, &option)) {
1608 cifs_dbg(VFS, "%s: Invalid rsize value\n",
1610 goto cifs_parse_mount_err;
1612 vol->rsize = option;
1615 if (get_option_ul(args, &option)) {
1616 cifs_dbg(VFS, "%s: Invalid wsize value\n",
1618 goto cifs_parse_mount_err;
1620 vol->wsize = option;
1623 if (get_option_ul(args, &option)) {
1624 cifs_dbg(VFS, "%s: Invalid actimeo value\n",
1626 goto cifs_parse_mount_err;
1628 vol->actimeo = HZ * option;
1629 if (vol->actimeo > CIFS_MAX_ACTIMEO) {
1630 cifs_dbg(VFS, "attribute cache timeout too large\n");
1631 goto cifs_parse_mount_err;
1634 case Opt_echo_interval:
1635 if (get_option_ul(args, &option)) {
1636 cifs_dbg(VFS, "%s: Invalid echo interval value\n",
1638 goto cifs_parse_mount_err;
1640 vol->echo_interval = option;
1643 if (get_option_ul(args, &option)) {
1644 cifs_dbg(VFS, "%s: Invalid snapshot time\n",
1646 goto cifs_parse_mount_err;
1648 vol->snapshot_time = option;
1650 case Opt_max_credits:
1651 if (get_option_ul(args, &option) || (option < 20) ||
1653 cifs_dbg(VFS, "%s: Invalid max_credits value\n",
1655 goto cifs_parse_mount_err;
1657 vol->max_credits = option;
1660 /* String Arguments */
1662 case Opt_blank_user:
1663 /* null user, ie. anonymous authentication */
1665 vol->username = NULL;
1668 string = match_strdup(args);
1672 if (strnlen(string, CIFS_MAX_USERNAME_LEN) >
1673 CIFS_MAX_USERNAME_LEN) {
1674 pr_warn("CIFS: username too long\n");
1675 goto cifs_parse_mount_err;
1678 kfree(vol->username);
1679 vol->username = kstrdup(string, GFP_KERNEL);
1681 goto cifs_parse_mount_err;
1683 case Opt_blank_pass:
1684 /* passwords have to be handled differently
1685 * to allow the character used for deliminator
1686 * to be passed within them
1690 * Check if this is a case where the password
1691 * starts with a delimiter
1693 tmp_end = strchr(data, '=');
1695 if (!(tmp_end < end && tmp_end[1] == delim)) {
1696 /* No it is not. Set the password to NULL */
1697 kfree(vol->password);
1698 vol->password = NULL;
1701 /* Yes it is. Drop down to Opt_pass below.*/
1703 /* Obtain the value string */
1704 value = strchr(data, '=');
1707 /* Set tmp_end to end of the string */
1708 tmp_end = (char *) value + strlen(value);
1710 /* Check if following character is the deliminator
1711 * If yes, we have encountered a double deliminator
1712 * reset the NULL character to the deliminator
1714 if (tmp_end < end && tmp_end[1] == delim) {
1717 /* Keep iterating until we get to a single
1718 * deliminator OR the end
1720 while ((tmp_end = strchr(tmp_end, delim))
1721 != NULL && (tmp_end[1] == delim)) {
1722 tmp_end = (char *) &tmp_end[2];
1725 /* Reset var options to point to next element */
1728 options = (char *) &tmp_end[1];
1730 /* Reached the end of the mount option
1735 kfree(vol->password);
1736 /* Now build new password string */
1737 temp_len = strlen(value);
1738 vol->password = kzalloc(temp_len+1, GFP_KERNEL);
1739 if (vol->password == NULL) {
1740 pr_warn("CIFS: no memory for password\n");
1741 goto cifs_parse_mount_err;
1744 for (i = 0, j = 0; i < temp_len; i++, j++) {
1745 vol->password[j] = value[i];
1746 if ((value[i] == delim) &&
1747 value[i+1] == delim)
1748 /* skip the second deliminator */
1751 vol->password[j] = '\0';
1754 /* FIXME: should this be an error instead? */
1758 string = match_strdup(args);
1762 if (!cifs_convert_address(dstaddr, string,
1764 pr_err("CIFS: bad ip= option (%s).\n", string);
1765 goto cifs_parse_mount_err;
1770 string = match_strdup(args);
1774 if (strnlen(string, CIFS_MAX_DOMAINNAME_LEN)
1775 == CIFS_MAX_DOMAINNAME_LEN) {
1776 pr_warn("CIFS: domain name too long\n");
1777 goto cifs_parse_mount_err;
1780 kfree(vol->domainname);
1781 vol->domainname = kstrdup(string, GFP_KERNEL);
1782 if (!vol->domainname) {
1783 pr_warn("CIFS: no memory for domainname\n");
1784 goto cifs_parse_mount_err;
1786 cifs_dbg(FYI, "Domain name set\n");
1789 string = match_strdup(args);
1793 if (!cifs_convert_address(
1794 (struct sockaddr *)&vol->srcaddr,
1795 string, strlen(string))) {
1796 pr_warn("CIFS: Could not parse srcaddr: %s\n",
1798 goto cifs_parse_mount_err;
1802 string = match_strdup(args);
1806 if (strnlen(string, 1024) >= 65) {
1807 pr_warn("CIFS: iocharset name too long.\n");
1808 goto cifs_parse_mount_err;
1811 if (strncasecmp(string, "default", 7) != 0) {
1812 kfree(vol->iocharset);
1813 vol->iocharset = kstrdup(string,
1815 if (!vol->iocharset) {
1816 pr_warn("CIFS: no memory for charset\n");
1817 goto cifs_parse_mount_err;
1820 /* if iocharset not set then load_nls_default
1823 cifs_dbg(FYI, "iocharset set to %s\n", string);
1825 case Opt_netbiosname:
1826 string = match_strdup(args);
1830 memset(vol->source_rfc1001_name, 0x20,
1833 * FIXME: are there cases in which a comma can
1834 * be valid in workstation netbios name (and
1835 * need special handling)?
1837 for (i = 0; i < RFC1001_NAME_LEN; i++) {
1838 /* don't ucase netbiosname for user */
1841 vol->source_rfc1001_name[i] = string[i];
1843 /* The string has 16th byte zero still from
1844 * set at top of the function
1846 if (i == RFC1001_NAME_LEN && string[i] != 0)
1847 pr_warn("CIFS: netbiosname longer than 15 truncated.\n");
1850 /* servernetbiosname specified override *SMBSERVER */
1851 string = match_strdup(args);
1855 /* last byte, type, is 0x20 for servr type */
1856 memset(vol->target_rfc1001_name, 0x20,
1857 RFC1001_NAME_LEN_WITH_NULL);
1859 /* BB are there cases in which a comma can be
1860 valid in this workstation netbios name
1861 (and need special handling)? */
1863 /* user or mount helper must uppercase the
1865 for (i = 0; i < 15; i++) {
1868 vol->target_rfc1001_name[i] = string[i];
1870 /* The string has 16th byte zero still from
1871 set at top of the function */
1872 if (i == RFC1001_NAME_LEN && string[i] != 0)
1873 pr_warn("CIFS: server netbiosname longer than 15 truncated.\n");
1876 string = match_strdup(args);
1880 if (strncasecmp(string, "1", 1) == 0) {
1881 /* This is the default */
1884 /* For all other value, error */
1885 pr_warn("CIFS: Invalid version specified\n");
1886 goto cifs_parse_mount_err;
1888 string = match_strdup(args);
1892 if (cifs_parse_smb_version(string, vol) != 0)
1893 goto cifs_parse_mount_err;
1896 string = match_strdup(args);
1900 if (cifs_parse_security_flavors(string, vol) != 0)
1901 goto cifs_parse_mount_err;
1904 string = match_strdup(args);
1908 if (cifs_parse_cache_flavor(string, vol) != 0)
1909 goto cifs_parse_mount_err;
1913 * An option we don't recognize. Save it off for later
1914 * if we haven't already found one
1920 /* Free up any allocated string */
1925 if (!sloppy && invalid) {
1926 pr_err("CIFS: Unknown mount option \"%s\"\n", invalid);
1927 goto cifs_parse_mount_err;
1931 /* Muliuser mounts require CONFIG_KEYS support */
1932 if (vol->multiuser) {
1933 cifs_dbg(VFS, "Multiuser mounts require kernels with CONFIG_KEYS enabled\n");
1934 goto cifs_parse_mount_err;
1938 cifs_dbg(VFS, "CIFS mount error: No usable UNC path provided in device string!\n");
1939 goto cifs_parse_mount_err;
1942 /* make sure UNC has a share name */
1943 if (!strchr(vol->UNC + 3, '\\')) {
1944 cifs_dbg(VFS, "Malformed UNC. Unable to find share name.\n");
1945 goto cifs_parse_mount_err;
1952 /* No ip= option specified? Try to get it from UNC */
1953 /* Use the address part of the UNC. */
1954 slash = strchr(&vol->UNC[2], '\\');
1955 len = slash - &vol->UNC[2];
1956 if (!cifs_convert_address(dstaddr, &vol->UNC[2], len)) {
1957 pr_err("Unable to determine destination address.\n");
1958 goto cifs_parse_mount_err;
1962 /* set the port that we got earlier */
1963 cifs_set_port(dstaddr, port);
1966 vol->override_uid = override_uid;
1967 else if (override_uid == 1)
1968 pr_notice("CIFS: ignoring forceuid mount option specified with no uid= option.\n");
1971 vol->override_gid = override_gid;
1972 else if (override_gid == 1)
1973 pr_notice("CIFS: ignoring forcegid mount option specified with no gid= option.\n");
1975 kfree(mountdata_copy);
1979 pr_warn("Could not allocate temporary buffer\n");
1980 cifs_parse_mount_err:
1982 kfree(mountdata_copy);
1986 /** Returns true if srcaddr isn't specified and rhs isn't
1987 * specified, or if srcaddr is specified and
1988 * matches the IP address of the rhs argument.
1991 srcip_matches(struct sockaddr *srcaddr, struct sockaddr *rhs)
1993 switch (srcaddr->sa_family) {
1995 return (rhs->sa_family == AF_UNSPEC);
1997 struct sockaddr_in *saddr4 = (struct sockaddr_in *)srcaddr;
1998 struct sockaddr_in *vaddr4 = (struct sockaddr_in *)rhs;
1999 return (saddr4->sin_addr.s_addr == vaddr4->sin_addr.s_addr);
2002 struct sockaddr_in6 *saddr6 = (struct sockaddr_in6 *)srcaddr;
2003 struct sockaddr_in6 *vaddr6 = (struct sockaddr_in6 *)rhs;
2004 return ipv6_addr_equal(&saddr6->sin6_addr, &vaddr6->sin6_addr);
2008 return false; /* don't expect to be here */
2013 * If no port is specified in addr structure, we try to match with 445 port
2014 * and if it fails - with 139 ports. It should be called only if address
2015 * families of server and addr are equal.
2018 match_port(struct TCP_Server_Info *server, struct sockaddr *addr)
2020 __be16 port, *sport;
2022 switch (addr->sa_family) {
2024 sport = &((struct sockaddr_in *) &server->dstaddr)->sin_port;
2025 port = ((struct sockaddr_in *) addr)->sin_port;
2028 sport = &((struct sockaddr_in6 *) &server->dstaddr)->sin6_port;
2029 port = ((struct sockaddr_in6 *) addr)->sin6_port;
2037 port = htons(CIFS_PORT);
2041 port = htons(RFC1001_PORT);
2044 return port == *sport;
2048 match_address(struct TCP_Server_Info *server, struct sockaddr *addr,
2049 struct sockaddr *srcaddr)
2051 switch (addr->sa_family) {
2053 struct sockaddr_in *addr4 = (struct sockaddr_in *)addr;
2054 struct sockaddr_in *srv_addr4 =
2055 (struct sockaddr_in *)&server->dstaddr;
2057 if (addr4->sin_addr.s_addr != srv_addr4->sin_addr.s_addr)
2062 struct sockaddr_in6 *addr6 = (struct sockaddr_in6 *)addr;
2063 struct sockaddr_in6 *srv_addr6 =
2064 (struct sockaddr_in6 *)&server->dstaddr;
2066 if (!ipv6_addr_equal(&addr6->sin6_addr,
2067 &srv_addr6->sin6_addr))
2069 if (addr6->sin6_scope_id != srv_addr6->sin6_scope_id)
2075 return false; /* don't expect to be here */
2078 if (!srcip_matches(srcaddr, (struct sockaddr *)&server->srcaddr))
2085 match_security(struct TCP_Server_Info *server, struct smb_vol *vol)
2088 * The select_sectype function should either return the vol->sectype
2089 * that was specified, or "Unspecified" if that sectype was not
2090 * compatible with the given NEGOTIATE request.
2092 if (server->ops->select_sectype(server, vol->sectype)
2097 * Now check if signing mode is acceptable. No need to check
2098 * global_secflags at this point since if MUST_SIGN is set then
2099 * the server->sign had better be too.
2101 if (vol->sign && !server->sign)
2107 static int match_server(struct TCP_Server_Info *server, struct smb_vol *vol)
2109 struct sockaddr *addr = (struct sockaddr *)&vol->dstaddr;
2111 if (vol->nosharesock)
2114 if ((server->vals != vol->vals) || (server->ops != vol->ops))
2117 if (!net_eq(cifs_net_ns(server), current->nsproxy->net_ns))
2120 if (!match_address(server, addr,
2121 (struct sockaddr *)&vol->srcaddr))
2124 if (!match_port(server, addr))
2127 if (!match_security(server, vol))
2130 if (server->echo_interval != vol->echo_interval * HZ)
2136 static struct TCP_Server_Info *
2137 cifs_find_tcp_session(struct smb_vol *vol)
2139 struct TCP_Server_Info *server;
2141 spin_lock(&cifs_tcp_ses_lock);
2142 list_for_each_entry(server, &cifs_tcp_ses_list, tcp_ses_list) {
2143 if (!match_server(server, vol))
2146 ++server->srv_count;
2147 spin_unlock(&cifs_tcp_ses_lock);
2148 cifs_dbg(FYI, "Existing tcp session with server found\n");
2151 spin_unlock(&cifs_tcp_ses_lock);
2156 cifs_put_tcp_session(struct TCP_Server_Info *server, int from_reconnect)
2158 struct task_struct *task;
2160 spin_lock(&cifs_tcp_ses_lock);
2161 if (--server->srv_count > 0) {
2162 spin_unlock(&cifs_tcp_ses_lock);
2166 put_net(cifs_net_ns(server));
2168 list_del_init(&server->tcp_ses_list);
2169 spin_unlock(&cifs_tcp_ses_lock);
2171 cancel_delayed_work_sync(&server->echo);
2173 #ifdef CONFIG_CIFS_SMB2
2176 * Avoid deadlock here: reconnect work calls
2177 * cifs_put_tcp_session() at its end. Need to be sure
2178 * that reconnect work does nothing with server pointer after
2181 cancel_delayed_work(&server->reconnect);
2183 cancel_delayed_work_sync(&server->reconnect);
2186 spin_lock(&GlobalMid_Lock);
2187 server->tcpStatus = CifsExiting;
2188 spin_unlock(&GlobalMid_Lock);
2190 cifs_crypto_secmech_release(server);
2191 cifs_fscache_release_client_cookie(server);
2193 kfree(server->session_key.response);
2194 server->session_key.response = NULL;
2195 server->session_key.len = 0;
2197 task = xchg(&server->tsk, NULL);
2199 force_sig(SIGKILL, task);
2202 static struct TCP_Server_Info *
2203 cifs_get_tcp_session(struct smb_vol *volume_info)
2205 struct TCP_Server_Info *tcp_ses = NULL;
2208 cifs_dbg(FYI, "UNC: %s\n", volume_info->UNC);
2210 /* see if we already have a matching tcp_ses */
2211 tcp_ses = cifs_find_tcp_session(volume_info);
2215 tcp_ses = kzalloc(sizeof(struct TCP_Server_Info), GFP_KERNEL);
2221 tcp_ses->ops = volume_info->ops;
2222 tcp_ses->vals = volume_info->vals;
2223 cifs_set_net_ns(tcp_ses, get_net(current->nsproxy->net_ns));
2224 tcp_ses->hostname = extract_hostname(volume_info->UNC);
2225 if (IS_ERR(tcp_ses->hostname)) {
2226 rc = PTR_ERR(tcp_ses->hostname);
2227 goto out_err_crypto_release;
2230 tcp_ses->noblocksnd = volume_info->noblocksnd;
2231 tcp_ses->noautotune = volume_info->noautotune;
2232 tcp_ses->tcp_nodelay = volume_info->sockopt_tcp_nodelay;
2233 tcp_ses->in_flight = 0;
2234 tcp_ses->credits = 1;
2235 init_waitqueue_head(&tcp_ses->response_q);
2236 init_waitqueue_head(&tcp_ses->request_q);
2237 INIT_LIST_HEAD(&tcp_ses->pending_mid_q);
2238 mutex_init(&tcp_ses->srv_mutex);
2239 memcpy(tcp_ses->workstation_RFC1001_name,
2240 volume_info->source_rfc1001_name, RFC1001_NAME_LEN_WITH_NULL);
2241 memcpy(tcp_ses->server_RFC1001_name,
2242 volume_info->target_rfc1001_name, RFC1001_NAME_LEN_WITH_NULL);
2243 tcp_ses->session_estab = false;
2244 tcp_ses->sequence_number = 0;
2245 tcp_ses->lstrp = jiffies;
2246 spin_lock_init(&tcp_ses->req_lock);
2247 INIT_LIST_HEAD(&tcp_ses->tcp_ses_list);
2248 INIT_LIST_HEAD(&tcp_ses->smb_ses_list);
2249 INIT_DELAYED_WORK(&tcp_ses->echo, cifs_echo_request);
2250 #ifdef CONFIG_CIFS_SMB2
2251 INIT_DELAYED_WORK(&tcp_ses->reconnect, smb2_reconnect_server);
2252 mutex_init(&tcp_ses->reconnect_mutex);
2254 memcpy(&tcp_ses->srcaddr, &volume_info->srcaddr,
2255 sizeof(tcp_ses->srcaddr));
2256 memcpy(&tcp_ses->dstaddr, &volume_info->dstaddr,
2257 sizeof(tcp_ses->dstaddr));
2258 #ifdef CONFIG_CIFS_SMB2
2259 generate_random_uuid(tcp_ses->client_guid);
2262 * at this point we are the only ones with the pointer
2263 * to the struct since the kernel thread not created yet
2264 * no need to spinlock this init of tcpStatus or srv_count
2266 tcp_ses->tcpStatus = CifsNew;
2267 ++tcp_ses->srv_count;
2269 if (volume_info->echo_interval >= SMB_ECHO_INTERVAL_MIN &&
2270 volume_info->echo_interval <= SMB_ECHO_INTERVAL_MAX)
2271 tcp_ses->echo_interval = volume_info->echo_interval * HZ;
2273 tcp_ses->echo_interval = SMB_ECHO_INTERVAL_DEFAULT * HZ;
2275 rc = ip_connect(tcp_ses);
2277 cifs_dbg(VFS, "Error connecting to socket. Aborting operation.\n");
2278 goto out_err_crypto_release;
2282 * since we're in a cifs function already, we know that
2283 * this will succeed. No need for try_module_get().
2285 __module_get(THIS_MODULE);
2286 tcp_ses->tsk = kthread_run(cifs_demultiplex_thread,
2288 if (IS_ERR(tcp_ses->tsk)) {
2289 rc = PTR_ERR(tcp_ses->tsk);
2290 cifs_dbg(VFS, "error %d create cifsd thread\n", rc);
2291 module_put(THIS_MODULE);
2292 goto out_err_crypto_release;
2294 tcp_ses->tcpStatus = CifsNeedNegotiate;
2296 /* thread spawned, put it on the list */
2297 spin_lock(&cifs_tcp_ses_lock);
2298 list_add(&tcp_ses->tcp_ses_list, &cifs_tcp_ses_list);
2299 spin_unlock(&cifs_tcp_ses_lock);
2301 cifs_fscache_get_client_cookie(tcp_ses);
2303 /* queue echo request delayed work */
2304 queue_delayed_work(cifsiod_wq, &tcp_ses->echo, tcp_ses->echo_interval);
2308 out_err_crypto_release:
2309 cifs_crypto_secmech_release(tcp_ses);
2311 put_net(cifs_net_ns(tcp_ses));
2315 if (!IS_ERR(tcp_ses->hostname))
2316 kfree(tcp_ses->hostname);
2317 if (tcp_ses->ssocket)
2318 sock_release(tcp_ses->ssocket);
2324 static int match_session(struct cifs_ses *ses, struct smb_vol *vol)
2326 if (vol->sectype != Unspecified &&
2327 vol->sectype != ses->sectype)
2330 switch (ses->sectype) {
2332 if (!uid_eq(vol->cred_uid, ses->cred_uid))
2336 /* NULL username means anonymous session */
2337 if (ses->user_name == NULL) {
2343 /* anything else takes username/password */
2344 if (strncmp(ses->user_name,
2345 vol->username ? vol->username : "",
2346 CIFS_MAX_USERNAME_LEN))
2348 if ((vol->username && strlen(vol->username) != 0) &&
2349 ses->password != NULL &&
2350 strncmp(ses->password,
2351 vol->password ? vol->password : "",
2352 CIFS_MAX_PASSWORD_LEN))
2358 static struct cifs_ses *
2359 cifs_find_smb_ses(struct TCP_Server_Info *server, struct smb_vol *vol)
2361 struct cifs_ses *ses;
2363 spin_lock(&cifs_tcp_ses_lock);
2364 list_for_each_entry(ses, &server->smb_ses_list, smb_ses_list) {
2365 if (ses->status == CifsExiting)
2367 if (!match_session(ses, vol))
2370 spin_unlock(&cifs_tcp_ses_lock);
2373 spin_unlock(&cifs_tcp_ses_lock);
2378 cifs_put_smb_ses(struct cifs_ses *ses)
2380 unsigned int rc, xid;
2381 struct TCP_Server_Info *server = ses->server;
2383 cifs_dbg(FYI, "%s: ses_count=%d\n", __func__, ses->ses_count);
2385 spin_lock(&cifs_tcp_ses_lock);
2386 if (ses->status == CifsExiting) {
2387 spin_unlock(&cifs_tcp_ses_lock);
2390 if (--ses->ses_count > 0) {
2391 spin_unlock(&cifs_tcp_ses_lock);
2394 if (ses->status == CifsGood)
2395 ses->status = CifsExiting;
2396 spin_unlock(&cifs_tcp_ses_lock);
2398 if (ses->status == CifsExiting && server->ops->logoff) {
2400 rc = server->ops->logoff(xid, ses);
2402 cifs_dbg(VFS, "%s: Session Logoff failure rc=%d\n",
2407 spin_lock(&cifs_tcp_ses_lock);
2408 list_del_init(&ses->smb_ses_list);
2409 spin_unlock(&cifs_tcp_ses_lock);
2412 cifs_put_tcp_session(server, 0);
2417 /* strlen("cifs:a:") + CIFS_MAX_DOMAINNAME_LEN + 1 */
2418 #define CIFSCREDS_DESC_SIZE (7 + CIFS_MAX_DOMAINNAME_LEN + 1)
2420 /* Populate username and pw fields from keyring if possible */
2422 cifs_set_cifscreds(struct smb_vol *vol, struct cifs_ses *ses)
2425 const char *delim, *payload;
2429 struct TCP_Server_Info *server = ses->server;
2430 struct sockaddr_in *sa;
2431 struct sockaddr_in6 *sa6;
2432 const struct user_key_payload *upayload;
2434 desc = kmalloc(CIFSCREDS_DESC_SIZE, GFP_KERNEL);
2438 /* try to find an address key first */
2439 switch (server->dstaddr.ss_family) {
2441 sa = (struct sockaddr_in *)&server->dstaddr;
2442 sprintf(desc, "cifs:a:%pI4", &sa->sin_addr.s_addr);
2445 sa6 = (struct sockaddr_in6 *)&server->dstaddr;
2446 sprintf(desc, "cifs:a:%pI6c", &sa6->sin6_addr.s6_addr);
2449 cifs_dbg(FYI, "Bad ss_family (%hu)\n",
2450 server->dstaddr.ss_family);
2455 cifs_dbg(FYI, "%s: desc=%s\n", __func__, desc);
2456 key = request_key(&key_type_logon, desc, "");
2458 if (!ses->domainName) {
2459 cifs_dbg(FYI, "domainName is NULL\n");
2464 /* didn't work, try to find a domain key */
2465 sprintf(desc, "cifs:d:%s", ses->domainName);
2466 cifs_dbg(FYI, "%s: desc=%s\n", __func__, desc);
2467 key = request_key(&key_type_logon, desc, "");
2474 down_read(&key->sem);
2475 upayload = user_key_payload_locked(key);
2476 if (IS_ERR_OR_NULL(upayload)) {
2477 rc = upayload ? PTR_ERR(upayload) : -EINVAL;
2481 /* find first : in payload */
2482 payload = upayload->data;
2483 delim = strnchr(payload, upayload->datalen, ':');
2484 cifs_dbg(FYI, "payload=%s\n", payload);
2486 cifs_dbg(FYI, "Unable to find ':' in payload (datalen=%d)\n",
2492 len = delim - payload;
2493 if (len > CIFS_MAX_USERNAME_LEN || len <= 0) {
2494 cifs_dbg(FYI, "Bad value from username search (len=%zd)\n",
2500 vol->username = kstrndup(payload, len, GFP_KERNEL);
2501 if (!vol->username) {
2502 cifs_dbg(FYI, "Unable to allocate %zd bytes for username\n",
2507 cifs_dbg(FYI, "%s: username=%s\n", __func__, vol->username);
2509 len = key->datalen - (len + 1);
2510 if (len > CIFS_MAX_PASSWORD_LEN || len <= 0) {
2511 cifs_dbg(FYI, "Bad len for password search (len=%zd)\n", len);
2513 kfree(vol->username);
2514 vol->username = NULL;
2519 vol->password = kstrndup(delim, len, GFP_KERNEL);
2520 if (!vol->password) {
2521 cifs_dbg(FYI, "Unable to allocate %zd bytes for password\n",
2524 kfree(vol->username);
2525 vol->username = NULL;
2534 cifs_dbg(FYI, "%s: returning %d\n", __func__, rc);
2537 #else /* ! CONFIG_KEYS */
2539 cifs_set_cifscreds(struct smb_vol *vol __attribute__((unused)),
2540 struct cifs_ses *ses __attribute__((unused)))
2544 #endif /* CONFIG_KEYS */
2546 static struct cifs_ses *
2547 cifs_get_smb_ses(struct TCP_Server_Info *server, struct smb_vol *volume_info)
2551 struct cifs_ses *ses;
2552 struct sockaddr_in *addr = (struct sockaddr_in *)&server->dstaddr;
2553 struct sockaddr_in6 *addr6 = (struct sockaddr_in6 *)&server->dstaddr;
2557 ses = cifs_find_smb_ses(server, volume_info);
2559 cifs_dbg(FYI, "Existing smb sess found (status=%d)\n",
2562 mutex_lock(&ses->session_mutex);
2563 rc = cifs_negotiate_protocol(xid, ses);
2565 mutex_unlock(&ses->session_mutex);
2566 /* problem -- put our ses reference */
2567 cifs_put_smb_ses(ses);
2571 if (ses->need_reconnect) {
2572 cifs_dbg(FYI, "Session needs reconnect\n");
2573 rc = cifs_setup_session(xid, ses,
2574 volume_info->local_nls);
2576 mutex_unlock(&ses->session_mutex);
2577 /* problem -- put our reference */
2578 cifs_put_smb_ses(ses);
2583 mutex_unlock(&ses->session_mutex);
2585 /* existing SMB ses has a server reference already */
2586 cifs_put_tcp_session(server, 0);
2591 cifs_dbg(FYI, "Existing smb sess not found\n");
2592 ses = sesInfoAlloc();
2596 /* new SMB session uses our server ref */
2597 ses->server = server;
2598 if (server->dstaddr.ss_family == AF_INET6)
2599 sprintf(ses->serverName, "%pI6", &addr6->sin6_addr);
2601 sprintf(ses->serverName, "%pI4", &addr->sin_addr);
2603 if (volume_info->username) {
2604 ses->user_name = kstrdup(volume_info->username, GFP_KERNEL);
2605 if (!ses->user_name)
2609 /* volume_info->password freed at unmount */
2610 if (volume_info->password) {
2611 ses->password = kstrdup(volume_info->password, GFP_KERNEL);
2615 if (volume_info->domainname) {
2616 ses->domainName = kstrdup(volume_info->domainname, GFP_KERNEL);
2617 if (!ses->domainName)
2620 if (volume_info->domainauto)
2621 ses->domainAuto = volume_info->domainauto;
2622 ses->cred_uid = volume_info->cred_uid;
2623 ses->linux_uid = volume_info->linux_uid;
2625 ses->sectype = volume_info->sectype;
2626 ses->sign = volume_info->sign;
2628 mutex_lock(&ses->session_mutex);
2629 rc = cifs_negotiate_protocol(xid, ses);
2631 rc = cifs_setup_session(xid, ses, volume_info->local_nls);
2632 mutex_unlock(&ses->session_mutex);
2636 /* success, put it on the list */
2637 spin_lock(&cifs_tcp_ses_lock);
2638 list_add(&ses->smb_ses_list, &server->smb_ses_list);
2639 spin_unlock(&cifs_tcp_ses_lock);
2650 static int match_tcon(struct cifs_tcon *tcon, struct smb_vol *volume_info)
2652 if (tcon->tidStatus == CifsExiting)
2654 if (strncmp(tcon->treeName, volume_info->UNC, MAX_TREE_SIZE))
2656 if (tcon->seal != volume_info->seal)
2658 #ifdef CONFIG_CIFS_SMB2
2659 if (tcon->snapshot_time != volume_info->snapshot_time)
2661 #endif /* CONFIG_CIFS_SMB2 */
2665 static struct cifs_tcon *
2666 cifs_find_tcon(struct cifs_ses *ses, struct smb_vol *volume_info)
2668 struct list_head *tmp;
2669 struct cifs_tcon *tcon;
2671 spin_lock(&cifs_tcp_ses_lock);
2672 list_for_each(tmp, &ses->tcon_list) {
2673 tcon = list_entry(tmp, struct cifs_tcon, tcon_list);
2674 if (!match_tcon(tcon, volume_info))
2677 spin_unlock(&cifs_tcp_ses_lock);
2680 spin_unlock(&cifs_tcp_ses_lock);
2685 cifs_put_tcon(struct cifs_tcon *tcon)
2688 struct cifs_ses *ses = tcon->ses;
2690 cifs_dbg(FYI, "%s: tc_count=%d\n", __func__, tcon->tc_count);
2691 spin_lock(&cifs_tcp_ses_lock);
2692 if (--tcon->tc_count > 0) {
2693 spin_unlock(&cifs_tcp_ses_lock);
2697 list_del_init(&tcon->tcon_list);
2698 spin_unlock(&cifs_tcp_ses_lock);
2701 if (ses->server->ops->tree_disconnect)
2702 ses->server->ops->tree_disconnect(xid, tcon);
2705 cifs_fscache_release_super_cookie(tcon);
2707 cifs_put_smb_ses(ses);
2710 static struct cifs_tcon *
2711 cifs_get_tcon(struct cifs_ses *ses, struct smb_vol *volume_info)
2714 struct cifs_tcon *tcon;
2716 tcon = cifs_find_tcon(ses, volume_info);
2718 cifs_dbg(FYI, "Found match on UNC path\n");
2719 /* existing tcon already has a reference */
2720 cifs_put_smb_ses(ses);
2724 if (!ses->server->ops->tree_connect) {
2729 tcon = tconInfoAlloc();
2735 if (volume_info->snapshot_time) {
2736 #ifdef CONFIG_CIFS_SMB2
2737 if (ses->server->vals->protocol_id == 0) {
2739 "Use SMB2 or later for snapshot mount option\n");
2743 tcon->snapshot_time = volume_info->snapshot_time;
2745 cifs_dbg(VFS, "Snapshot mount option requires SMB2 support\n");
2748 #endif /* CONFIG_CIFS_SMB2 */
2752 if (volume_info->password) {
2753 tcon->password = kstrdup(volume_info->password, GFP_KERNEL);
2754 if (!tcon->password) {
2761 * BB Do we need to wrap session_mutex around this TCon call and Unix
2762 * SetFS as we do on SessSetup and reconnect?
2765 rc = ses->server->ops->tree_connect(xid, ses, volume_info->UNC, tcon,
2766 volume_info->local_nls);
2768 cifs_dbg(FYI, "Tcon rc = %d\n", rc);
2772 if (volume_info->nodfs) {
2773 tcon->Flags &= ~SMB_SHARE_IS_IN_DFS;
2774 cifs_dbg(FYI, "DFS disabled (%d)\n", tcon->Flags);
2776 tcon->use_persistent = false;
2777 /* check if SMB2 or later, CIFS does not support persistent handles */
2778 if (volume_info->persistent) {
2779 if (ses->server->vals->protocol_id == 0) {
2781 "SMB3 or later required for persistent handles\n");
2784 #ifdef CONFIG_CIFS_SMB2
2785 } else if (ses->server->capabilities &
2786 SMB2_GLOBAL_CAP_PERSISTENT_HANDLES)
2787 tcon->use_persistent = true;
2788 else /* persistent handles requested but not supported */ {
2790 "Persistent handles not supported on share\n");
2793 #endif /* CONFIG_CIFS_SMB2 */
2795 #ifdef CONFIG_CIFS_SMB2
2796 } else if ((tcon->capabilities & SMB2_SHARE_CAP_CONTINUOUS_AVAILABILITY)
2797 && (ses->server->capabilities & SMB2_GLOBAL_CAP_PERSISTENT_HANDLES)
2798 && (volume_info->nopersistent == false)) {
2799 cifs_dbg(FYI, "enabling persistent handles\n");
2800 tcon->use_persistent = true;
2801 #endif /* CONFIG_CIFS_SMB2 */
2802 } else if (volume_info->resilient) {
2803 if (ses->server->vals->protocol_id == 0) {
2805 "SMB2.1 or later required for resilient handles\n");
2809 tcon->use_resilient = true;
2812 if (volume_info->seal) {
2813 if (ses->server->vals->protocol_id == 0) {
2815 "SMB3 or later required for encryption\n");
2818 #ifdef CONFIG_CIFS_SMB2
2819 } else if (tcon->ses->server->capabilities &
2820 SMB2_GLOBAL_CAP_ENCRYPTION)
2823 cifs_dbg(VFS, "Encryption is not supported on share\n");
2826 #endif /* CONFIG_CIFS_SMB2 */
2831 * We can have only one retry value for a connection to a share so for
2832 * resources mounted more than once to the same server share the last
2833 * value passed in for the retry flag is used.
2835 tcon->retry = volume_info->retry;
2836 tcon->nocase = volume_info->nocase;
2837 tcon->local_lease = volume_info->local_lease;
2838 INIT_LIST_HEAD(&tcon->pending_opens);
2840 spin_lock(&cifs_tcp_ses_lock);
2841 list_add(&tcon->tcon_list, &ses->tcon_list);
2842 spin_unlock(&cifs_tcp_ses_lock);
2844 cifs_fscache_get_super_cookie(tcon);
2854 cifs_put_tlink(struct tcon_link *tlink)
2856 if (!tlink || IS_ERR(tlink))
2859 if (!atomic_dec_and_test(&tlink->tl_count) ||
2860 test_bit(TCON_LINK_IN_TREE, &tlink->tl_flags)) {
2861 tlink->tl_time = jiffies;
2865 if (!IS_ERR(tlink_tcon(tlink)))
2866 cifs_put_tcon(tlink_tcon(tlink));
2871 static inline struct tcon_link *
2872 cifs_sb_master_tlink(struct cifs_sb_info *cifs_sb)
2874 return cifs_sb->master_tlink;
2878 compare_mount_options(struct super_block *sb, struct cifs_mnt_data *mnt_data)
2880 struct cifs_sb_info *old = CIFS_SB(sb);
2881 struct cifs_sb_info *new = mnt_data->cifs_sb;
2883 if ((sb->s_flags & CIFS_MS_MASK) != (mnt_data->flags & CIFS_MS_MASK))
2886 if ((old->mnt_cifs_flags & CIFS_MOUNT_MASK) !=
2887 (new->mnt_cifs_flags & CIFS_MOUNT_MASK))
2891 * We want to share sb only if we don't specify an r/wsize or
2892 * specified r/wsize is greater than or equal to existing one.
2894 if (new->wsize && new->wsize < old->wsize)
2897 if (new->rsize && new->rsize < old->rsize)
2900 if (!uid_eq(old->mnt_uid, new->mnt_uid) || !gid_eq(old->mnt_gid, new->mnt_gid))
2903 if (old->mnt_file_mode != new->mnt_file_mode ||
2904 old->mnt_dir_mode != new->mnt_dir_mode)
2907 if (strcmp(old->local_nls->charset, new->local_nls->charset))
2910 if (old->actimeo != new->actimeo)
2917 match_prepath(struct super_block *sb, struct cifs_mnt_data *mnt_data)
2919 struct cifs_sb_info *old = CIFS_SB(sb);
2920 struct cifs_sb_info *new = mnt_data->cifs_sb;
2921 bool old_set = old->mnt_cifs_flags & CIFS_MOUNT_USE_PREFIX_PATH;
2922 bool new_set = new->mnt_cifs_flags & CIFS_MOUNT_USE_PREFIX_PATH;
2924 if (old_set && new_set && !strcmp(new->prepath, old->prepath))
2926 else if (!old_set && !new_set)
2933 cifs_match_super(struct super_block *sb, void *data)
2935 struct cifs_mnt_data *mnt_data = (struct cifs_mnt_data *)data;
2936 struct smb_vol *volume_info;
2937 struct cifs_sb_info *cifs_sb;
2938 struct TCP_Server_Info *tcp_srv;
2939 struct cifs_ses *ses;
2940 struct cifs_tcon *tcon;
2941 struct tcon_link *tlink;
2944 spin_lock(&cifs_tcp_ses_lock);
2945 cifs_sb = CIFS_SB(sb);
2946 tlink = cifs_get_tlink(cifs_sb_master_tlink(cifs_sb));
2947 if (IS_ERR(tlink)) {
2948 spin_unlock(&cifs_tcp_ses_lock);
2951 tcon = tlink_tcon(tlink);
2953 tcp_srv = ses->server;
2955 volume_info = mnt_data->vol;
2957 if (!match_server(tcp_srv, volume_info) ||
2958 !match_session(ses, volume_info) ||
2959 !match_tcon(tcon, volume_info) ||
2960 !match_prepath(sb, mnt_data)) {
2965 rc = compare_mount_options(sb, mnt_data);
2967 spin_unlock(&cifs_tcp_ses_lock);
2968 cifs_put_tlink(tlink);
2973 get_dfs_path(const unsigned int xid, struct cifs_ses *ses, const char *old_path,
2974 const struct nls_table *nls_codepage, unsigned int *num_referrals,
2975 struct dfs_info3_param **referrals, int remap)
2980 if (!ses->server->ops->tree_connect || !ses->server->ops->get_dfs_refer)
2986 if (ses->ipc_tid == 0) {
2987 temp_unc = kmalloc(2 /* for slashes */ +
2988 strnlen(ses->serverName, SERVER_NAME_LEN_WITH_NULL * 2)
2989 + 1 + 4 /* slash IPC$ */ + 2, GFP_KERNEL);
2990 if (temp_unc == NULL)
2994 strcpy(temp_unc + 2, ses->serverName);
2995 strcpy(temp_unc + 2 + strlen(ses->serverName), "\\IPC$");
2996 rc = ses->server->ops->tree_connect(xid, ses, temp_unc, NULL,
2998 cifs_dbg(FYI, "Tcon rc = %d ipc_tid = %d\n", rc, ses->ipc_tid);
3002 rc = ses->server->ops->get_dfs_refer(xid, ses, old_path,
3003 referrals, num_referrals,
3004 nls_codepage, remap);
3006 * BB - map targetUNCs to dfs_info3 structures, here or in
3007 * ses->server->ops->get_dfs_refer.
3013 #ifdef CONFIG_DEBUG_LOCK_ALLOC
3014 static struct lock_class_key cifs_key[2];
3015 static struct lock_class_key cifs_slock_key[2];
3018 cifs_reclassify_socket4(struct socket *sock)
3020 struct sock *sk = sock->sk;
3021 BUG_ON(!sock_allow_reclassification(sk));
3022 sock_lock_init_class_and_name(sk, "slock-AF_INET-CIFS",
3023 &cifs_slock_key[0], "sk_lock-AF_INET-CIFS", &cifs_key[0]);
3027 cifs_reclassify_socket6(struct socket *sock)
3029 struct sock *sk = sock->sk;
3030 BUG_ON(!sock_allow_reclassification(sk));
3031 sock_lock_init_class_and_name(sk, "slock-AF_INET6-CIFS",
3032 &cifs_slock_key[1], "sk_lock-AF_INET6-CIFS", &cifs_key[1]);
3036 cifs_reclassify_socket4(struct socket *sock)
3041 cifs_reclassify_socket6(struct socket *sock)
3046 /* See RFC1001 section 14 on representation of Netbios names */
3047 static void rfc1002mangle(char *target, char *source, unsigned int length)
3051 for (i = 0, j = 0; i < (length); i++) {
3052 /* mask a nibble at a time and encode */
3053 target[j] = 'A' + (0x0F & (source[i] >> 4));
3054 target[j+1] = 'A' + (0x0F & source[i]);
3061 bind_socket(struct TCP_Server_Info *server)
3064 if (server->srcaddr.ss_family != AF_UNSPEC) {
3065 /* Bind to the specified local IP address */
3066 struct socket *socket = server->ssocket;
3067 rc = socket->ops->bind(socket,
3068 (struct sockaddr *) &server->srcaddr,
3069 sizeof(server->srcaddr));
3071 struct sockaddr_in *saddr4;
3072 struct sockaddr_in6 *saddr6;
3073 saddr4 = (struct sockaddr_in *)&server->srcaddr;
3074 saddr6 = (struct sockaddr_in6 *)&server->srcaddr;
3075 if (saddr6->sin6_family == AF_INET6)
3076 cifs_dbg(VFS, "Failed to bind to: %pI6c, error: %d\n",
3077 &saddr6->sin6_addr, rc);
3079 cifs_dbg(VFS, "Failed to bind to: %pI4, error: %d\n",
3080 &saddr4->sin_addr.s_addr, rc);
3087 ip_rfc1001_connect(struct TCP_Server_Info *server)
3091 * some servers require RFC1001 sessinit before sending
3092 * negprot - BB check reconnection in case where second
3093 * sessinit is sent but no second negprot
3095 struct rfc1002_session_packet *ses_init_buf;
3096 struct smb_hdr *smb_buf;
3097 ses_init_buf = kzalloc(sizeof(struct rfc1002_session_packet),
3100 ses_init_buf->trailer.session_req.called_len = 32;
3102 if (server->server_RFC1001_name[0] != 0)
3103 rfc1002mangle(ses_init_buf->trailer.
3104 session_req.called_name,
3105 server->server_RFC1001_name,
3106 RFC1001_NAME_LEN_WITH_NULL);
3108 rfc1002mangle(ses_init_buf->trailer.
3109 session_req.called_name,
3110 DEFAULT_CIFS_CALLED_NAME,
3111 RFC1001_NAME_LEN_WITH_NULL);
3113 ses_init_buf->trailer.session_req.calling_len = 32;
3116 * calling name ends in null (byte 16) from old smb
3119 if (server->workstation_RFC1001_name[0] != 0)
3120 rfc1002mangle(ses_init_buf->trailer.
3121 session_req.calling_name,
3122 server->workstation_RFC1001_name,
3123 RFC1001_NAME_LEN_WITH_NULL);
3125 rfc1002mangle(ses_init_buf->trailer.
3126 session_req.calling_name,
3128 RFC1001_NAME_LEN_WITH_NULL);
3130 ses_init_buf->trailer.session_req.scope1 = 0;
3131 ses_init_buf->trailer.session_req.scope2 = 0;
3132 smb_buf = (struct smb_hdr *)ses_init_buf;
3134 /* sizeof RFC1002_SESSION_REQUEST with no scope */
3135 smb_buf->smb_buf_length = cpu_to_be32(0x81000044);
3136 rc = smb_send(server, smb_buf, 0x44);
3137 kfree(ses_init_buf);
3139 * RFC1001 layer in at least one server
3140 * requires very short break before negprot
3141 * presumably because not expecting negprot
3142 * to follow so fast. This is a simple
3143 * solution that works without
3144 * complicating the code and causes no
3145 * significant slowing down on mount
3148 usleep_range(1000, 2000);
3151 * else the negprot may still work without this
3152 * even though malloc failed
3159 generic_ip_connect(struct TCP_Server_Info *server)
3164 struct socket *socket = server->ssocket;
3165 struct sockaddr *saddr;
3167 saddr = (struct sockaddr *) &server->dstaddr;
3169 if (server->dstaddr.ss_family == AF_INET6) {
3170 sport = ((struct sockaddr_in6 *) saddr)->sin6_port;
3171 slen = sizeof(struct sockaddr_in6);
3174 sport = ((struct sockaddr_in *) saddr)->sin_port;
3175 slen = sizeof(struct sockaddr_in);
3179 if (socket == NULL) {
3180 rc = __sock_create(cifs_net_ns(server), sfamily, SOCK_STREAM,
3181 IPPROTO_TCP, &socket, 1);
3183 cifs_dbg(VFS, "Error %d creating socket\n", rc);
3184 server->ssocket = NULL;
3188 /* BB other socket options to set KEEPALIVE, NODELAY? */
3189 cifs_dbg(FYI, "Socket created\n");
3190 server->ssocket = socket;
3191 socket->sk->sk_allocation = GFP_NOFS;
3192 if (sfamily == AF_INET6)
3193 cifs_reclassify_socket6(socket);
3195 cifs_reclassify_socket4(socket);
3198 rc = bind_socket(server);
3203 * Eventually check for other socket options to change from
3204 * the default. sock_setsockopt not used because it expects
3207 socket->sk->sk_rcvtimeo = 7 * HZ;
3208 socket->sk->sk_sndtimeo = 5 * HZ;
3210 /* make the bufsizes depend on wsize/rsize and max requests */
3211 if (server->noautotune) {
3212 if (socket->sk->sk_sndbuf < (200 * 1024))
3213 socket->sk->sk_sndbuf = 200 * 1024;
3214 if (socket->sk->sk_rcvbuf < (140 * 1024))
3215 socket->sk->sk_rcvbuf = 140 * 1024;
3218 if (server->tcp_nodelay) {
3220 rc = kernel_setsockopt(socket, SOL_TCP, TCP_NODELAY,
3221 (char *)&val, sizeof(val));
3223 cifs_dbg(FYI, "set TCP_NODELAY socket option error %d\n",
3227 cifs_dbg(FYI, "sndbuf %d rcvbuf %d rcvtimeo 0x%lx\n",
3228 socket->sk->sk_sndbuf,
3229 socket->sk->sk_rcvbuf, socket->sk->sk_rcvtimeo);
3231 rc = socket->ops->connect(socket, saddr, slen, 0);
3233 cifs_dbg(FYI, "Error %d connecting to server\n", rc);
3234 sock_release(socket);
3235 server->ssocket = NULL;
3239 if (sport == htons(RFC1001_PORT))
3240 rc = ip_rfc1001_connect(server);
3246 ip_connect(struct TCP_Server_Info *server)
3249 struct sockaddr_in6 *addr6 = (struct sockaddr_in6 *)&server->dstaddr;
3250 struct sockaddr_in *addr = (struct sockaddr_in *)&server->dstaddr;
3252 if (server->dstaddr.ss_family == AF_INET6)
3253 sport = &addr6->sin6_port;
3255 sport = &addr->sin_port;
3260 /* try with 445 port at first */
3261 *sport = htons(CIFS_PORT);
3263 rc = generic_ip_connect(server);
3267 /* if it failed, try with 139 port */
3268 *sport = htons(RFC1001_PORT);
3271 return generic_ip_connect(server);
3274 void reset_cifs_unix_caps(unsigned int xid, struct cifs_tcon *tcon,
3275 struct cifs_sb_info *cifs_sb, struct smb_vol *vol_info)
3277 /* if we are reconnecting then should we check to see if
3278 * any requested capabilities changed locally e.g. via
3279 * remount but we can not do much about it here
3280 * if they have (even if we could detect it by the following)
3281 * Perhaps we could add a backpointer to array of sb from tcon
3282 * or if we change to make all sb to same share the same
3283 * sb as NFS - then we only have one backpointer to sb.
3284 * What if we wanted to mount the server share twice once with
3285 * and once without posixacls or posix paths? */
3286 __u64 saved_cap = le64_to_cpu(tcon->fsUnixInfo.Capability);
3288 if (vol_info && vol_info->no_linux_ext) {
3289 tcon->fsUnixInfo.Capability = 0;
3290 tcon->unix_ext = 0; /* Unix Extensions disabled */
3291 cifs_dbg(FYI, "Linux protocol extensions disabled\n");
3293 } else if (vol_info)
3294 tcon->unix_ext = 1; /* Unix Extensions supported */
3296 if (tcon->unix_ext == 0) {
3297 cifs_dbg(FYI, "Unix extensions disabled so not set on reconnect\n");
3301 if (!CIFSSMBQFSUnixInfo(xid, tcon)) {
3302 __u64 cap = le64_to_cpu(tcon->fsUnixInfo.Capability);
3303 cifs_dbg(FYI, "unix caps which server supports %lld\n", cap);
3304 /* check for reconnect case in which we do not
3305 want to change the mount behavior if we can avoid it */
3306 if (vol_info == NULL) {
3307 /* turn off POSIX ACL and PATHNAMES if not set
3308 originally at mount time */
3309 if ((saved_cap & CIFS_UNIX_POSIX_ACL_CAP) == 0)
3310 cap &= ~CIFS_UNIX_POSIX_ACL_CAP;
3311 if ((saved_cap & CIFS_UNIX_POSIX_PATHNAMES_CAP) == 0) {
3312 if (cap & CIFS_UNIX_POSIX_PATHNAMES_CAP)
3313 cifs_dbg(VFS, "POSIXPATH support change\n");
3314 cap &= ~CIFS_UNIX_POSIX_PATHNAMES_CAP;
3315 } else if ((cap & CIFS_UNIX_POSIX_PATHNAMES_CAP) == 0) {
3316 cifs_dbg(VFS, "possible reconnect error\n");
3317 cifs_dbg(VFS, "server disabled POSIX path support\n");
3321 if (cap & CIFS_UNIX_TRANSPORT_ENCRYPTION_MANDATORY_CAP)
3322 cifs_dbg(VFS, "per-share encryption not supported yet\n");
3324 cap &= CIFS_UNIX_CAP_MASK;
3325 if (vol_info && vol_info->no_psx_acl)
3326 cap &= ~CIFS_UNIX_POSIX_ACL_CAP;
3327 else if (CIFS_UNIX_POSIX_ACL_CAP & cap) {
3328 cifs_dbg(FYI, "negotiated posix acl support\n");
3330 cifs_sb->mnt_cifs_flags |=
3331 CIFS_MOUNT_POSIXACL;
3334 if (vol_info && vol_info->posix_paths == 0)
3335 cap &= ~CIFS_UNIX_POSIX_PATHNAMES_CAP;
3336 else if (cap & CIFS_UNIX_POSIX_PATHNAMES_CAP) {
3337 cifs_dbg(FYI, "negotiate posix pathnames\n");
3339 cifs_sb->mnt_cifs_flags |=
3340 CIFS_MOUNT_POSIX_PATHS;
3343 cifs_dbg(FYI, "Negotiate caps 0x%x\n", (int)cap);
3344 #ifdef CONFIG_CIFS_DEBUG2
3345 if (cap & CIFS_UNIX_FCNTL_CAP)
3346 cifs_dbg(FYI, "FCNTL cap\n");
3347 if (cap & CIFS_UNIX_EXTATTR_CAP)
3348 cifs_dbg(FYI, "EXTATTR cap\n");
3349 if (cap & CIFS_UNIX_POSIX_PATHNAMES_CAP)
3350 cifs_dbg(FYI, "POSIX path cap\n");
3351 if (cap & CIFS_UNIX_XATTR_CAP)
3352 cifs_dbg(FYI, "XATTR cap\n");
3353 if (cap & CIFS_UNIX_POSIX_ACL_CAP)
3354 cifs_dbg(FYI, "POSIX ACL cap\n");
3355 if (cap & CIFS_UNIX_LARGE_READ_CAP)
3356 cifs_dbg(FYI, "very large read cap\n");
3357 if (cap & CIFS_UNIX_LARGE_WRITE_CAP)
3358 cifs_dbg(FYI, "very large write cap\n");
3359 if (cap & CIFS_UNIX_TRANSPORT_ENCRYPTION_CAP)
3360 cifs_dbg(FYI, "transport encryption cap\n");
3361 if (cap & CIFS_UNIX_TRANSPORT_ENCRYPTION_MANDATORY_CAP)
3362 cifs_dbg(FYI, "mandatory transport encryption cap\n");
3363 #endif /* CIFS_DEBUG2 */
3364 if (CIFSSMBSetFSUnixInfo(xid, tcon, cap)) {
3365 if (vol_info == NULL) {
3366 cifs_dbg(FYI, "resetting capabilities failed\n");
3368 cifs_dbg(VFS, "Negotiating Unix capabilities with the server failed. Consider mounting with the Unix Extensions disabled if problems are found by specifying the nounix mount option.\n");
3374 int cifs_setup_cifs_sb(struct smb_vol *pvolume_info,
3375 struct cifs_sb_info *cifs_sb)
3377 INIT_DELAYED_WORK(&cifs_sb->prune_tlinks, cifs_prune_tlinks);
3379 spin_lock_init(&cifs_sb->tlink_tree_lock);
3380 cifs_sb->tlink_tree = RB_ROOT;
3383 * Temporarily set r/wsize for matching superblock. If we end up using
3384 * new sb then client will later negotiate it downward if needed.
3386 cifs_sb->rsize = pvolume_info->rsize;
3387 cifs_sb->wsize = pvolume_info->wsize;
3389 cifs_sb->mnt_uid = pvolume_info->linux_uid;
3390 cifs_sb->mnt_gid = pvolume_info->linux_gid;
3391 cifs_sb->mnt_file_mode = pvolume_info->file_mode;
3392 cifs_sb->mnt_dir_mode = pvolume_info->dir_mode;
3393 cifs_dbg(FYI, "file mode: 0x%hx dir mode: 0x%hx\n",
3394 cifs_sb->mnt_file_mode, cifs_sb->mnt_dir_mode);
3396 cifs_sb->actimeo = pvolume_info->actimeo;
3397 cifs_sb->local_nls = pvolume_info->local_nls;
3399 if (pvolume_info->noperm)
3400 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_NO_PERM;
3401 if (pvolume_info->setuids)
3402 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_SET_UID;
3403 if (pvolume_info->setuidfromacl)
3404 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_UID_FROM_ACL;
3405 if (pvolume_info->server_ino)
3406 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_SERVER_INUM;
3407 if (pvolume_info->remap)
3408 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_MAP_SFM_CHR;
3409 if (pvolume_info->sfu_remap)
3410 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_MAP_SPECIAL_CHR;
3411 if (pvolume_info->no_xattr)
3412 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_NO_XATTR;
3413 if (pvolume_info->sfu_emul)
3414 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_UNX_EMUL;
3415 if (pvolume_info->nobrl)
3416 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_NO_BRL;
3417 if (pvolume_info->nostrictsync)
3418 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_NOSSYNC;
3419 if (pvolume_info->mand_lock)
3420 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_NOPOSIXBRL;
3421 if (pvolume_info->rwpidforward)
3422 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_RWPIDFORWARD;
3423 if (pvolume_info->cifs_acl)
3424 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_CIFS_ACL;
3425 if (pvolume_info->backupuid_specified) {
3426 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_CIFS_BACKUPUID;
3427 cifs_sb->mnt_backupuid = pvolume_info->backupuid;
3429 if (pvolume_info->backupgid_specified) {
3430 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_CIFS_BACKUPGID;
3431 cifs_sb->mnt_backupgid = pvolume_info->backupgid;
3433 if (pvolume_info->override_uid)
3434 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_OVERR_UID;
3435 if (pvolume_info->override_gid)
3436 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_OVERR_GID;
3437 if (pvolume_info->dynperm)
3438 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_DYNPERM;
3439 if (pvolume_info->fsc)
3440 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_FSCACHE;
3441 if (pvolume_info->multiuser)
3442 cifs_sb->mnt_cifs_flags |= (CIFS_MOUNT_MULTIUSER |
3443 CIFS_MOUNT_NO_PERM);
3444 if (pvolume_info->strict_io)
3445 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_STRICT_IO;
3446 if (pvolume_info->direct_io) {
3447 cifs_dbg(FYI, "mounting share using direct i/o\n");
3448 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_DIRECT_IO;
3450 if (pvolume_info->mfsymlinks) {
3451 if (pvolume_info->sfu_emul) {
3453 * Our SFU ("Services for Unix" emulation does not allow
3454 * creating symlinks but does allow reading existing SFU
3455 * symlinks (it does allow both creating and reading SFU
3456 * style mknod and FIFOs though). When "mfsymlinks" and
3457 * "sfu" are both enabled at the same time, it allows
3458 * reading both types of symlinks, but will only create
3459 * them with mfsymlinks format. This allows better
3460 * Apple compatibility (probably better for Samba too)
3461 * while still recognizing old Windows style symlinks.
3463 cifs_dbg(VFS, "mount options mfsymlinks and sfu both enabled\n");
3465 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_MF_SYMLINKS;
3468 if ((pvolume_info->cifs_acl) && (pvolume_info->dynperm))
3469 cifs_dbg(VFS, "mount option dynperm ignored if cifsacl mount option supported\n");
3471 if (pvolume_info->prepath) {
3472 cifs_sb->prepath = kstrdup(pvolume_info->prepath, GFP_KERNEL);
3473 if (cifs_sb->prepath == NULL)
3481 cleanup_volume_info_contents(struct smb_vol *volume_info)
3483 kfree(volume_info->username);
3484 kzfree(volume_info->password);
3485 kfree(volume_info->UNC);
3486 kfree(volume_info->domainname);
3487 kfree(volume_info->iocharset);
3488 kfree(volume_info->prepath);
3492 cifs_cleanup_volume_info(struct smb_vol *volume_info)
3496 cleanup_volume_info_contents(volume_info);
3501 #ifdef CONFIG_CIFS_DFS_UPCALL
3503 * cifs_build_path_to_root returns full path to root when we do not have an
3504 * exiting connection (tcon)
3507 build_unc_path_to_root(const struct smb_vol *vol,
3508 const struct cifs_sb_info *cifs_sb)
3510 char *full_path, *pos;
3511 unsigned int pplen = vol->prepath ? strlen(vol->prepath) + 1 : 0;
3512 unsigned int unc_len = strnlen(vol->UNC, MAX_TREE_SIZE + 1);
3514 full_path = kmalloc(unc_len + pplen + 1, GFP_KERNEL);
3515 if (full_path == NULL)
3516 return ERR_PTR(-ENOMEM);
3518 strncpy(full_path, vol->UNC, unc_len);
3519 pos = full_path + unc_len;
3522 *pos = CIFS_DIR_SEP(cifs_sb);
3523 strncpy(pos + 1, vol->prepath, pplen);
3527 *pos = '\0'; /* add trailing null */
3528 convert_delimiter(full_path, CIFS_DIR_SEP(cifs_sb));
3529 cifs_dbg(FYI, "%s: full_path=%s\n", __func__, full_path);
3534 * Perform a dfs referral query for a share and (optionally) prefix
3536 * If a referral is found, cifs_sb->mountdata will be (re-)allocated
3537 * to a string containing updated options for the submount. Otherwise it
3538 * will be left untouched.
3540 * Returns the rc from get_dfs_path to the caller, which can be used to
3541 * determine whether there were referrals.
3544 expand_dfs_referral(const unsigned int xid, struct cifs_ses *ses,
3545 struct smb_vol *volume_info, struct cifs_sb_info *cifs_sb,
3549 unsigned int num_referrals = 0;
3550 struct dfs_info3_param *referrals = NULL;
3551 char *full_path = NULL, *ref_path = NULL, *mdata = NULL;
3553 full_path = build_unc_path_to_root(volume_info, cifs_sb);
3554 if (IS_ERR(full_path))
3555 return PTR_ERR(full_path);
3557 /* For DFS paths, skip the first '\' of the UNC */
3558 ref_path = check_prefix ? full_path + 1 : volume_info->UNC + 1;
3560 rc = get_dfs_path(xid, ses, ref_path, cifs_sb->local_nls,
3561 &num_referrals, &referrals, cifs_remap(cifs_sb));
3563 if (!rc && num_referrals > 0) {
3564 char *fake_devname = NULL;
3566 mdata = cifs_compose_mount_options(cifs_sb->mountdata,
3567 full_path + 1, referrals,
3570 free_dfs_info_array(referrals, num_referrals);
3572 if (IS_ERR(mdata)) {
3573 rc = PTR_ERR(mdata);
3576 cleanup_volume_info_contents(volume_info);
3577 rc = cifs_setup_volume_info(volume_info, mdata,
3580 kfree(fake_devname);
3581 kfree(cifs_sb->mountdata);
3582 cifs_sb->mountdata = mdata;
3590 cifs_setup_volume_info(struct smb_vol *volume_info, char *mount_data,
3591 const char *devname)
3595 if (cifs_parse_mount_options(mount_data, devname, volume_info))
3598 if (volume_info->nullauth) {
3599 cifs_dbg(FYI, "Anonymous login\n");
3600 kfree(volume_info->username);
3601 volume_info->username = NULL;
3602 } else if (volume_info->username) {
3603 /* BB fixme parse for domain name here */
3604 cifs_dbg(FYI, "Username: %s\n", volume_info->username);
3606 cifs_dbg(VFS, "No username specified\n");
3607 /* In userspace mount helper we can get user name from alternate
3608 locations such as env variables and files on disk */
3612 /* this is needed for ASCII cp to Unicode converts */
3613 if (volume_info->iocharset == NULL) {
3614 /* load_nls_default cannot return null */
3615 volume_info->local_nls = load_nls_default();
3617 volume_info->local_nls = load_nls(volume_info->iocharset);
3618 if (volume_info->local_nls == NULL) {
3619 cifs_dbg(VFS, "CIFS mount error: iocharset %s not found\n",
3620 volume_info->iocharset);
3629 cifs_get_volume_info(char *mount_data, const char *devname)
3632 struct smb_vol *volume_info;
3634 volume_info = kmalloc(sizeof(struct smb_vol), GFP_KERNEL);
3636 return ERR_PTR(-ENOMEM);
3638 rc = cifs_setup_volume_info(volume_info, mount_data, devname);
3640 cifs_cleanup_volume_info(volume_info);
3641 volume_info = ERR_PTR(rc);
3648 cifs_are_all_path_components_accessible(struct TCP_Server_Info *server,
3650 struct cifs_tcon *tcon,
3651 struct cifs_sb_info *cifs_sb,
3658 sep = CIFS_DIR_SEP(cifs_sb);
3661 rc = server->ops->is_path_accessible(xid, tcon, cifs_sb, "");
3663 /* skip separators */
3668 /* next separator */
3669 while (*s && *s != sep)
3673 * temporarily null-terminate the path at the end of
3674 * the current component
3678 rc = server->ops->is_path_accessible(xid, tcon, cifs_sb,
3686 cifs_mount(struct cifs_sb_info *cifs_sb, struct smb_vol *volume_info)
3690 struct cifs_ses *ses;
3691 struct cifs_tcon *tcon;
3692 struct TCP_Server_Info *server;
3694 struct tcon_link *tlink;
3695 #ifdef CONFIG_CIFS_DFS_UPCALL
3696 int referral_walks_count = 0;
3699 #ifdef CONFIG_CIFS_DFS_UPCALL
3701 /* cleanup activities if we're chasing a referral */
3702 if (referral_walks_count) {
3704 cifs_put_tcon(tcon);
3706 cifs_put_smb_ses(ses);
3708 cifs_sb->mnt_cifs_flags &= ~CIFS_MOUNT_POSIX_PATHS;
3722 /* get a reference to a tcp session */
3723 server = cifs_get_tcp_session(volume_info);
3724 if (IS_ERR(server)) {
3725 rc = PTR_ERR(server);
3728 if ((volume_info->max_credits < 20) ||
3729 (volume_info->max_credits > 60000))
3730 server->max_credits = SMB2_MAX_CREDITS_AVAILABLE;
3732 server->max_credits = volume_info->max_credits;
3733 /* get a reference to a SMB session */
3734 ses = cifs_get_smb_ses(server, volume_info);
3738 goto mount_fail_check;
3741 #ifdef CONFIG_CIFS_SMB2
3742 if ((volume_info->persistent == true) && ((ses->server->capabilities &
3743 SMB2_GLOBAL_CAP_PERSISTENT_HANDLES) == 0)) {
3744 cifs_dbg(VFS, "persistent handles not supported by server\n");
3746 goto mount_fail_check;
3748 #endif /* CONFIG_CIFS_SMB2*/
3750 /* search for existing tcon to this server share */
3751 tcon = cifs_get_tcon(ses, volume_info);
3756 goto mount_fail_check;
3758 goto remote_path_check;
3761 /* tell server which Unix caps we support */
3762 if (cap_unix(tcon->ses)) {
3763 /* reset of caps checks mount to see if unix extensions
3764 disabled for just this mount */
3765 reset_cifs_unix_caps(xid, tcon, cifs_sb, volume_info);
3766 if ((tcon->ses->server->tcpStatus == CifsNeedReconnect) &&
3767 (le64_to_cpu(tcon->fsUnixInfo.Capability) &
3768 CIFS_UNIX_TRANSPORT_ENCRYPTION_MANDATORY_CAP)) {
3770 goto mount_fail_check;
3773 tcon->unix_ext = 0; /* server does not support them */
3775 /* do not care if a following call succeed - informational */
3776 if (!tcon->ipc && server->ops->qfs_tcon)
3777 server->ops->qfs_tcon(xid, tcon);
3779 cifs_sb->wsize = server->ops->negotiate_wsize(tcon, volume_info);
3780 cifs_sb->rsize = server->ops->negotiate_rsize(tcon, volume_info);
3783 #ifdef CONFIG_CIFS_DFS_UPCALL
3785 * Perform an unconditional check for whether there are DFS
3786 * referrals for this path without prefix, to provide support
3787 * for DFS referrals from w2k8 servers which don't seem to respond
3788 * with PATH_NOT_COVERED to requests that include the prefix.
3789 * Chase the referral if found, otherwise continue normally.
3791 if (referral_walks_count == 0) {
3792 int refrc = expand_dfs_referral(xid, ses, volume_info, cifs_sb,
3795 referral_walks_count++;
3796 goto try_mount_again;
3801 /* check if a whole path is not remote */
3803 if (!server->ops->is_path_accessible) {
3805 goto mount_fail_check;
3808 * cifs_build_path_to_root works only when we have a valid tcon
3810 full_path = cifs_build_path_to_root(volume_info, cifs_sb, tcon,
3811 tcon->Flags & SMB_SHARE_IS_IN_DFS);
3812 if (full_path == NULL) {
3814 goto mount_fail_check;
3816 rc = server->ops->is_path_accessible(xid, tcon, cifs_sb,
3818 if (rc != 0 && rc != -EREMOTE) {
3820 goto mount_fail_check;
3823 if (rc != -EREMOTE) {
3824 rc = cifs_are_all_path_components_accessible(server,
3828 cifs_dbg(VFS, "cannot query dirs between root and final path, "
3829 "enabling CIFS_MOUNT_USE_PREFIX_PATH\n");
3830 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_USE_PREFIX_PATH;
3837 /* get referral if needed */
3838 if (rc == -EREMOTE) {
3839 #ifdef CONFIG_CIFS_DFS_UPCALL
3840 if (referral_walks_count > MAX_NESTED_LINKS) {
3842 * BB: when we implement proper loop detection,
3843 * we will remove this check. But now we need it
3844 * to prevent an indefinite loop if 'DFS tree' is
3845 * misconfigured (i.e. has loops).
3848 goto mount_fail_check;
3851 rc = expand_dfs_referral(xid, ses, volume_info, cifs_sb, true);
3854 referral_walks_count++;
3855 goto try_mount_again;
3857 goto mount_fail_check;
3858 #else /* No DFS support, return error on mount */
3864 goto mount_fail_check;
3866 /* now, hang the tcon off of the superblock */
3867 tlink = kzalloc(sizeof *tlink, GFP_KERNEL);
3868 if (tlink == NULL) {
3870 goto mount_fail_check;
3873 tlink->tl_uid = ses->linux_uid;
3874 tlink->tl_tcon = tcon;
3875 tlink->tl_time = jiffies;
3876 set_bit(TCON_LINK_MASTER, &tlink->tl_flags);
3877 set_bit(TCON_LINK_IN_TREE, &tlink->tl_flags);
3879 cifs_sb->master_tlink = tlink;
3880 spin_lock(&cifs_sb->tlink_tree_lock);
3881 tlink_rb_insert(&cifs_sb->tlink_tree, tlink);
3882 spin_unlock(&cifs_sb->tlink_tree_lock);
3884 queue_delayed_work(cifsiod_wq, &cifs_sb->prune_tlinks,
3888 /* on error free sesinfo and tcon struct if needed */
3890 /* If find_unc succeeded then rc == 0 so we can not end */
3891 /* up accidentally freeing someone elses tcon struct */
3893 cifs_put_tcon(tcon);
3895 cifs_put_smb_ses(ses);
3897 cifs_put_tcp_session(server, 0);
3906 * Issue a TREE_CONNECT request. Note that for IPC$ shares, that the tcon
3907 * pointer may be NULL.
3910 CIFSTCon(const unsigned int xid, struct cifs_ses *ses,
3911 const char *tree, struct cifs_tcon *tcon,
3912 const struct nls_table *nls_codepage)
3914 struct smb_hdr *smb_buffer;
3915 struct smb_hdr *smb_buffer_response;
3918 unsigned char *bcc_ptr;
3921 __u16 bytes_left, count;
3926 smb_buffer = cifs_buf_get();
3927 if (smb_buffer == NULL)
3930 smb_buffer_response = smb_buffer;
3932 header_assemble(smb_buffer, SMB_COM_TREE_CONNECT_ANDX,
3933 NULL /*no tid */ , 4 /*wct */ );
3935 smb_buffer->Mid = get_next_mid(ses->server);
3936 smb_buffer->Uid = ses->Suid;
3937 pSMB = (TCONX_REQ *) smb_buffer;
3938 pSMBr = (TCONX_RSP *) smb_buffer_response;
3940 pSMB->AndXCommand = 0xFF;
3941 pSMB->Flags = cpu_to_le16(TCON_EXTENDED_SECINFO);
3942 bcc_ptr = &pSMB->Password[0];
3943 if (!tcon || (ses->server->sec_mode & SECMODE_USER)) {
3944 pSMB->PasswordLength = cpu_to_le16(1); /* minimum */
3945 *bcc_ptr = 0; /* password is null byte */
3946 bcc_ptr++; /* skip password */
3947 /* already aligned so no need to do it below */
3949 pSMB->PasswordLength = cpu_to_le16(CIFS_AUTH_RESP_SIZE);
3950 /* BB FIXME add code to fail this if NTLMv2 or Kerberos
3951 specified as required (when that support is added to
3952 the vfs in the future) as only NTLM or the much
3953 weaker LANMAN (which we do not send by default) is accepted
3954 by Samba (not sure whether other servers allow
3955 NTLMv2 password here) */
3956 #ifdef CONFIG_CIFS_WEAK_PW_HASH
3957 if ((global_secflags & CIFSSEC_MAY_LANMAN) &&
3958 (ses->sectype == LANMAN))
3959 calc_lanman_hash(tcon->password, ses->server->cryptkey,
3960 ses->server->sec_mode &
3961 SECMODE_PW_ENCRYPT ? true : false,
3964 #endif /* CIFS_WEAK_PW_HASH */
3965 rc = SMBNTencrypt(tcon->password, ses->server->cryptkey,
3966 bcc_ptr, nls_codepage);
3968 cifs_dbg(FYI, "%s Can't generate NTLM rsp. Error: %d\n",
3970 cifs_buf_release(smb_buffer);
3974 bcc_ptr += CIFS_AUTH_RESP_SIZE;
3975 if (ses->capabilities & CAP_UNICODE) {
3976 /* must align unicode strings */
3977 *bcc_ptr = 0; /* null byte password */
3982 if (ses->server->sign)
3983 smb_buffer->Flags2 |= SMBFLG2_SECURITY_SIGNATURE;
3985 if (ses->capabilities & CAP_STATUS32) {
3986 smb_buffer->Flags2 |= SMBFLG2_ERR_STATUS;
3988 if (ses->capabilities & CAP_DFS) {
3989 smb_buffer->Flags2 |= SMBFLG2_DFS;
3991 if (ses->capabilities & CAP_UNICODE) {
3992 smb_buffer->Flags2 |= SMBFLG2_UNICODE;
3994 cifs_strtoUTF16((__le16 *) bcc_ptr, tree,
3995 6 /* max utf8 char length in bytes */ *
3996 (/* server len*/ + 256 /* share len */), nls_codepage);
3997 bcc_ptr += 2 * length; /* convert num 16 bit words to bytes */
3998 bcc_ptr += 2; /* skip trailing null */
3999 } else { /* ASCII */
4000 strcpy(bcc_ptr, tree);
4001 bcc_ptr += strlen(tree) + 1;
4003 strcpy(bcc_ptr, "?????");
4004 bcc_ptr += strlen("?????");
4006 count = bcc_ptr - &pSMB->Password[0];
4007 pSMB->hdr.smb_buf_length = cpu_to_be32(be32_to_cpu(
4008 pSMB->hdr.smb_buf_length) + count);
4009 pSMB->ByteCount = cpu_to_le16(count);
4011 rc = SendReceive(xid, ses, smb_buffer, smb_buffer_response, &length,
4014 /* above now done in SendReceive */
4015 if ((rc == 0) && (tcon != NULL)) {
4018 tcon->tidStatus = CifsGood;
4019 tcon->need_reconnect = false;
4020 tcon->tid = smb_buffer_response->Tid;
4021 bcc_ptr = pByteArea(smb_buffer_response);
4022 bytes_left = get_bcc(smb_buffer_response);
4023 length = strnlen(bcc_ptr, bytes_left - 2);
4024 if (smb_buffer->Flags2 & SMBFLG2_UNICODE)
4030 /* skip service field (NB: this field is always ASCII) */
4032 if ((bcc_ptr[0] == 'I') && (bcc_ptr[1] == 'P') &&
4033 (bcc_ptr[2] == 'C')) {
4034 cifs_dbg(FYI, "IPC connection\n");
4037 } else if (length == 2) {
4038 if ((bcc_ptr[0] == 'A') && (bcc_ptr[1] == ':')) {
4039 /* the most common case */
4040 cifs_dbg(FYI, "disk share connection\n");
4043 bcc_ptr += length + 1;
4044 bytes_left -= (length + 1);
4045 strlcpy(tcon->treeName, tree, sizeof(tcon->treeName));
4047 /* mostly informational -- no need to fail on error here */
4048 kfree(tcon->nativeFileSystem);
4049 tcon->nativeFileSystem = cifs_strndup_from_utf16(bcc_ptr,
4050 bytes_left, is_unicode,
4053 cifs_dbg(FYI, "nativeFileSystem=%s\n", tcon->nativeFileSystem);
4055 if ((smb_buffer_response->WordCount == 3) ||
4056 (smb_buffer_response->WordCount == 7))
4057 /* field is in same location */
4058 tcon->Flags = le16_to_cpu(pSMBr->OptionalSupport);
4061 cifs_dbg(FYI, "Tcon flags: 0x%x\n", tcon->Flags);
4062 } else if ((rc == 0) && tcon == NULL) {
4063 /* all we need to save for IPC$ connection */
4064 ses->ipc_tid = smb_buffer_response->Tid;
4067 cifs_buf_release(smb_buffer);
4071 static void delayed_free(struct rcu_head *p)
4073 struct cifs_sb_info *sbi = container_of(p, struct cifs_sb_info, rcu);
4074 unload_nls(sbi->local_nls);
4079 cifs_umount(struct cifs_sb_info *cifs_sb)
4081 struct rb_root *root = &cifs_sb->tlink_tree;
4082 struct rb_node *node;
4083 struct tcon_link *tlink;
4085 cancel_delayed_work_sync(&cifs_sb->prune_tlinks);
4087 spin_lock(&cifs_sb->tlink_tree_lock);
4088 while ((node = rb_first(root))) {
4089 tlink = rb_entry(node, struct tcon_link, tl_rbnode);
4090 cifs_get_tlink(tlink);
4091 clear_bit(TCON_LINK_IN_TREE, &tlink->tl_flags);
4092 rb_erase(node, root);
4094 spin_unlock(&cifs_sb->tlink_tree_lock);
4095 cifs_put_tlink(tlink);
4096 spin_lock(&cifs_sb->tlink_tree_lock);
4098 spin_unlock(&cifs_sb->tlink_tree_lock);
4100 kfree(cifs_sb->mountdata);
4101 kfree(cifs_sb->prepath);
4102 call_rcu(&cifs_sb->rcu, delayed_free);
4106 cifs_negotiate_protocol(const unsigned int xid, struct cifs_ses *ses)
4109 struct TCP_Server_Info *server = ses->server;
4111 if (!server->ops->need_neg || !server->ops->negotiate)
4114 /* only send once per connect */
4115 if (!server->ops->need_neg(server))
4118 set_credits(server, 1);
4120 rc = server->ops->negotiate(xid, ses);
4122 spin_lock(&GlobalMid_Lock);
4123 if (server->tcpStatus == CifsNeedNegotiate)
4124 server->tcpStatus = CifsGood;
4127 spin_unlock(&GlobalMid_Lock);
4134 cifs_setup_session(const unsigned int xid, struct cifs_ses *ses,
4135 struct nls_table *nls_info)
4138 struct TCP_Server_Info *server = ses->server;
4140 ses->capabilities = server->capabilities;
4141 if (linuxExtEnabled == 0)
4142 ses->capabilities &= (~server->vals->cap_unix);
4144 cifs_dbg(FYI, "Security Mode: 0x%x Capabilities: 0x%x TimeAdjust: %d\n",
4145 server->sec_mode, server->capabilities, server->timeAdj);
4147 if (server->ops->sess_setup)
4148 rc = server->ops->sess_setup(xid, ses, nls_info);
4151 cifs_dbg(VFS, "Send error in SessSetup = %d\n", rc);
4157 cifs_set_vol_auth(struct smb_vol *vol, struct cifs_ses *ses)
4159 vol->sectype = ses->sectype;
4161 /* krb5 is special, since we don't need username or pw */
4162 if (vol->sectype == Kerberos)
4165 return cifs_set_cifscreds(vol, ses);
4168 static struct cifs_tcon *
4169 cifs_construct_tcon(struct cifs_sb_info *cifs_sb, kuid_t fsuid)
4172 struct cifs_tcon *master_tcon = cifs_sb_master_tcon(cifs_sb);
4173 struct cifs_ses *ses;
4174 struct cifs_tcon *tcon = NULL;
4175 struct smb_vol *vol_info;
4177 vol_info = kzalloc(sizeof(*vol_info), GFP_KERNEL);
4178 if (vol_info == NULL)
4179 return ERR_PTR(-ENOMEM);
4181 vol_info->local_nls = cifs_sb->local_nls;
4182 vol_info->linux_uid = fsuid;
4183 vol_info->cred_uid = fsuid;
4184 vol_info->UNC = master_tcon->treeName;
4185 vol_info->retry = master_tcon->retry;
4186 vol_info->nocase = master_tcon->nocase;
4187 vol_info->local_lease = master_tcon->local_lease;
4188 vol_info->no_linux_ext = !master_tcon->unix_ext;
4189 vol_info->sectype = master_tcon->ses->sectype;
4190 vol_info->sign = master_tcon->ses->sign;
4192 rc = cifs_set_vol_auth(vol_info, master_tcon->ses);
4198 /* get a reference for the same TCP session */
4199 spin_lock(&cifs_tcp_ses_lock);
4200 ++master_tcon->ses->server->srv_count;
4201 spin_unlock(&cifs_tcp_ses_lock);
4203 ses = cifs_get_smb_ses(master_tcon->ses->server, vol_info);
4205 tcon = (struct cifs_tcon *)ses;
4206 cifs_put_tcp_session(master_tcon->ses->server, 0);
4210 tcon = cifs_get_tcon(ses, vol_info);
4212 cifs_put_smb_ses(ses);
4217 reset_cifs_unix_caps(0, tcon, NULL, vol_info);
4219 kfree(vol_info->username);
4220 kfree(vol_info->password);
4227 cifs_sb_master_tcon(struct cifs_sb_info *cifs_sb)
4229 return tlink_tcon(cifs_sb_master_tlink(cifs_sb));
4232 /* find and return a tlink with given uid */
4233 static struct tcon_link *
4234 tlink_rb_search(struct rb_root *root, kuid_t uid)
4236 struct rb_node *node = root->rb_node;
4237 struct tcon_link *tlink;
4240 tlink = rb_entry(node, struct tcon_link, tl_rbnode);
4242 if (uid_gt(tlink->tl_uid, uid))
4243 node = node->rb_left;
4244 else if (uid_lt(tlink->tl_uid, uid))
4245 node = node->rb_right;
4252 /* insert a tcon_link into the tree */
4254 tlink_rb_insert(struct rb_root *root, struct tcon_link *new_tlink)
4256 struct rb_node **new = &(root->rb_node), *parent = NULL;
4257 struct tcon_link *tlink;
4260 tlink = rb_entry(*new, struct tcon_link, tl_rbnode);
4263 if (uid_gt(tlink->tl_uid, new_tlink->tl_uid))
4264 new = &((*new)->rb_left);
4266 new = &((*new)->rb_right);
4269 rb_link_node(&new_tlink->tl_rbnode, parent, new);
4270 rb_insert_color(&new_tlink->tl_rbnode, root);
4274 * Find or construct an appropriate tcon given a cifs_sb and the fsuid of the
4277 * If the superblock doesn't refer to a multiuser mount, then just return
4278 * the master tcon for the mount.
4280 * First, search the rbtree for an existing tcon for this fsuid. If one
4281 * exists, then check to see if it's pending construction. If it is then wait
4282 * for construction to complete. Once it's no longer pending, check to see if
4283 * it failed and either return an error or retry construction, depending on
4286 * If one doesn't exist then insert a new tcon_link struct into the tree and
4287 * try to construct a new one.
4290 cifs_sb_tlink(struct cifs_sb_info *cifs_sb)
4293 kuid_t fsuid = current_fsuid();
4294 struct tcon_link *tlink, *newtlink;
4296 if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MULTIUSER))
4297 return cifs_get_tlink(cifs_sb_master_tlink(cifs_sb));
4299 spin_lock(&cifs_sb->tlink_tree_lock);
4300 tlink = tlink_rb_search(&cifs_sb->tlink_tree, fsuid);
4302 cifs_get_tlink(tlink);
4303 spin_unlock(&cifs_sb->tlink_tree_lock);
4305 if (tlink == NULL) {
4306 newtlink = kzalloc(sizeof(*tlink), GFP_KERNEL);
4307 if (newtlink == NULL)
4308 return ERR_PTR(-ENOMEM);
4309 newtlink->tl_uid = fsuid;
4310 newtlink->tl_tcon = ERR_PTR(-EACCES);
4311 set_bit(TCON_LINK_PENDING, &newtlink->tl_flags);
4312 set_bit(TCON_LINK_IN_TREE, &newtlink->tl_flags);
4313 cifs_get_tlink(newtlink);
4315 spin_lock(&cifs_sb->tlink_tree_lock);
4316 /* was one inserted after previous search? */
4317 tlink = tlink_rb_search(&cifs_sb->tlink_tree, fsuid);
4319 cifs_get_tlink(tlink);
4320 spin_unlock(&cifs_sb->tlink_tree_lock);
4322 goto wait_for_construction;
4325 tlink_rb_insert(&cifs_sb->tlink_tree, tlink);
4326 spin_unlock(&cifs_sb->tlink_tree_lock);
4328 wait_for_construction:
4329 ret = wait_on_bit(&tlink->tl_flags, TCON_LINK_PENDING,
4330 TASK_INTERRUPTIBLE);
4332 cifs_put_tlink(tlink);
4333 return ERR_PTR(-ERESTARTSYS);
4336 /* if it's good, return it */
4337 if (!IS_ERR(tlink->tl_tcon))
4340 /* return error if we tried this already recently */
4341 if (time_before(jiffies, tlink->tl_time + TLINK_ERROR_EXPIRE)) {
4342 cifs_put_tlink(tlink);
4343 return ERR_PTR(-EACCES);
4346 if (test_and_set_bit(TCON_LINK_PENDING, &tlink->tl_flags))
4347 goto wait_for_construction;
4350 tlink->tl_tcon = cifs_construct_tcon(cifs_sb, fsuid);
4351 clear_bit(TCON_LINK_PENDING, &tlink->tl_flags);
4352 wake_up_bit(&tlink->tl_flags, TCON_LINK_PENDING);
4354 if (IS_ERR(tlink->tl_tcon)) {
4355 cifs_put_tlink(tlink);
4356 return ERR_PTR(-EACCES);
4363 * periodic workqueue job that scans tcon_tree for a superblock and closes
4367 cifs_prune_tlinks(struct work_struct *work)
4369 struct cifs_sb_info *cifs_sb = container_of(work, struct cifs_sb_info,
4371 struct rb_root *root = &cifs_sb->tlink_tree;
4372 struct rb_node *node = rb_first(root);
4373 struct rb_node *tmp;
4374 struct tcon_link *tlink;
4377 * Because we drop the spinlock in the loop in order to put the tlink
4378 * it's not guarded against removal of links from the tree. The only
4379 * places that remove entries from the tree are this function and
4380 * umounts. Because this function is non-reentrant and is canceled
4381 * before umount can proceed, this is safe.
4383 spin_lock(&cifs_sb->tlink_tree_lock);
4384 node = rb_first(root);
4385 while (node != NULL) {
4387 node = rb_next(tmp);
4388 tlink = rb_entry(tmp, struct tcon_link, tl_rbnode);
4390 if (test_bit(TCON_LINK_MASTER, &tlink->tl_flags) ||
4391 atomic_read(&tlink->tl_count) != 0 ||
4392 time_after(tlink->tl_time + TLINK_IDLE_EXPIRE, jiffies))
4395 cifs_get_tlink(tlink);
4396 clear_bit(TCON_LINK_IN_TREE, &tlink->tl_flags);
4397 rb_erase(tmp, root);
4399 spin_unlock(&cifs_sb->tlink_tree_lock);
4400 cifs_put_tlink(tlink);
4401 spin_lock(&cifs_sb->tlink_tree_lock);
4403 spin_unlock(&cifs_sb->tlink_tree_lock);
4405 queue_delayed_work(cifsiod_wq, &cifs_sb->prune_tlinks,