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>
49 #include "cifsproto.h"
50 #include "cifs_unicode.h"
51 #include "cifs_debug.h"
52 #include "cifs_fs_sb.h"
55 #include "rfc1002pdu.h"
57 #include "smb2proto.h"
58 #include "smbdirect.h"
61 #define RFC1001_PORT 139
63 extern mempool_t *cifs_req_poolp;
64 extern bool disable_legacy_dialects;
66 /* FIXME: should these be tunable? */
67 #define TLINK_ERROR_EXPIRE (1 * HZ)
68 #define TLINK_IDLE_EXPIRE (600 * HZ)
71 /* Mount options that take no arguments */
72 Opt_user_xattr, Opt_nouser_xattr,
73 Opt_forceuid, Opt_noforceuid,
74 Opt_forcegid, Opt_noforcegid,
75 Opt_noblocksend, Opt_noautotune,
76 Opt_hard, Opt_soft, Opt_perm, Opt_noperm,
77 Opt_mapposix, Opt_nomapposix,
78 Opt_mapchars, Opt_nomapchars, Opt_sfu,
79 Opt_nosfu, Opt_nodfs, Opt_posixpaths,
80 Opt_noposixpaths, Opt_nounix, Opt_unix,
83 Opt_handlecache, Opt_nohandlecache,
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,
97 Opt_domainauto, Opt_rdma,
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_nounix, "noposix" },
150 { Opt_unix, "unix" },
151 { Opt_unix, "linux" },
152 { Opt_unix, "posix" },
153 { Opt_nocase, "nocase" },
154 { Opt_nocase, "ignorecase" },
156 { Opt_nobrl, "nobrl" },
157 { Opt_handlecache, "handlecache" },
158 { Opt_nohandlecache, "nohandlecache" },
159 { Opt_nobrl, "nolock" },
160 { Opt_forcemandatorylock, "forcemandatorylock" },
161 { Opt_forcemandatorylock, "forcemand" },
162 { Opt_setuids, "setuids" },
163 { Opt_nosetuids, "nosetuids" },
164 { Opt_setuidfromacl, "idsfromsid" },
165 { Opt_dynperm, "dynperm" },
166 { Opt_nodynperm, "nodynperm" },
167 { Opt_nohard, "nohard" },
168 { Opt_nosoft, "nosoft" },
169 { Opt_nointr, "nointr" },
170 { Opt_intr, "intr" },
171 { Opt_nostrictsync, "nostrictsync" },
172 { Opt_strictsync, "strictsync" },
173 { Opt_serverino, "serverino" },
174 { Opt_noserverino, "noserverino" },
175 { Opt_rwpidforward, "rwpidforward" },
176 { Opt_cifsacl, "cifsacl" },
177 { Opt_nocifsacl, "nocifsacl" },
179 { Opt_noacl, "noacl" },
180 { Opt_locallease, "locallease" },
181 { Opt_sign, "sign" },
182 { Opt_seal, "seal" },
183 { Opt_noac, "noac" },
185 { Opt_mfsymlinks, "mfsymlinks" },
186 { Opt_multiuser, "multiuser" },
187 { Opt_sloppy, "sloppy" },
188 { Opt_nosharesock, "nosharesock" },
189 { Opt_persistent, "persistenthandles"},
190 { Opt_nopersistent, "nopersistenthandles"},
191 { Opt_resilient, "resilienthandles"},
192 { Opt_noresilient, "noresilienthandles"},
193 { Opt_domainauto, "domainauto"},
196 { Opt_backupuid, "backupuid=%s" },
197 { Opt_backupgid, "backupgid=%s" },
198 { Opt_uid, "uid=%s" },
199 { Opt_cruid, "cruid=%s" },
200 { Opt_gid, "gid=%s" },
201 { Opt_file_mode, "file_mode=%s" },
202 { Opt_dirmode, "dirmode=%s" },
203 { Opt_dirmode, "dir_mode=%s" },
204 { Opt_port, "port=%s" },
205 { Opt_rsize, "rsize=%s" },
206 { Opt_wsize, "wsize=%s" },
207 { Opt_actimeo, "actimeo=%s" },
208 { Opt_echo_interval, "echo_interval=%s" },
209 { Opt_max_credits, "max_credits=%s" },
210 { Opt_snapshot, "snapshot=%s" },
212 { Opt_blank_user, "user=" },
213 { Opt_blank_user, "username=" },
214 { Opt_user, "user=%s" },
215 { Opt_user, "username=%s" },
216 { Opt_blank_pass, "pass=" },
217 { Opt_blank_pass, "password=" },
218 { Opt_pass, "pass=%s" },
219 { Opt_pass, "password=%s" },
220 { Opt_blank_ip, "ip=" },
221 { Opt_blank_ip, "addr=" },
223 { Opt_ip, "addr=%s" },
224 { Opt_ignore, "unc=%s" },
225 { Opt_ignore, "target=%s" },
226 { Opt_ignore, "path=%s" },
227 { Opt_domain, "dom=%s" },
228 { Opt_domain, "domain=%s" },
229 { Opt_domain, "workgroup=%s" },
230 { Opt_srcaddr, "srcaddr=%s" },
231 { Opt_ignore, "prefixpath=%s" },
232 { Opt_iocharset, "iocharset=%s" },
233 { Opt_netbiosname, "netbiosname=%s" },
234 { Opt_servern, "servern=%s" },
235 { Opt_ver, "ver=%s" },
236 { Opt_vers, "vers=%s" },
237 { Opt_sec, "sec=%s" },
238 { Opt_cache, "cache=%s" },
240 { Opt_ignore, "cred" },
241 { Opt_ignore, "credentials" },
242 { Opt_ignore, "cred=%s" },
243 { Opt_ignore, "credentials=%s" },
244 { Opt_ignore, "guest" },
245 { Opt_ignore, "rw" },
246 { Opt_ignore, "ro" },
247 { Opt_ignore, "suid" },
248 { Opt_ignore, "nosuid" },
249 { Opt_ignore, "exec" },
250 { Opt_ignore, "noexec" },
251 { Opt_ignore, "nodev" },
252 { Opt_ignore, "noauto" },
253 { Opt_ignore, "dev" },
254 { Opt_ignore, "mand" },
255 { Opt_ignore, "nomand" },
256 { Opt_ignore, "_netdev" },
262 Opt_sec_krb5, Opt_sec_krb5i, Opt_sec_krb5p,
263 Opt_sec_ntlmsspi, Opt_sec_ntlmssp,
264 Opt_ntlm, Opt_sec_ntlmi, Opt_sec_ntlmv2,
265 Opt_sec_ntlmv2i, Opt_sec_lanman,
271 static const match_table_t cifs_secflavor_tokens = {
272 { Opt_sec_krb5, "krb5" },
273 { Opt_sec_krb5i, "krb5i" },
274 { Opt_sec_krb5p, "krb5p" },
275 { Opt_sec_ntlmsspi, "ntlmsspi" },
276 { Opt_sec_ntlmssp, "ntlmssp" },
277 { Opt_ntlm, "ntlm" },
278 { Opt_sec_ntlmi, "ntlmi" },
279 { Opt_sec_ntlmv2, "nontlm" },
280 { Opt_sec_ntlmv2, "ntlmv2" },
281 { Opt_sec_ntlmv2i, "ntlmv2i" },
282 { Opt_sec_lanman, "lanman" },
283 { Opt_sec_none, "none" },
285 { Opt_sec_err, NULL }
296 static const match_table_t cifs_cacheflavor_tokens = {
297 { Opt_cache_loose, "loose" },
298 { Opt_cache_strict, "strict" },
299 { Opt_cache_none, "none" },
300 { Opt_cache_err, NULL }
303 static const match_table_t cifs_smb_version_tokens = {
304 { Smb_1, SMB1_VERSION_STRING },
305 { Smb_20, SMB20_VERSION_STRING},
306 { Smb_21, SMB21_VERSION_STRING },
307 { Smb_30, SMB30_VERSION_STRING },
308 { Smb_302, SMB302_VERSION_STRING },
309 #ifdef CONFIG_CIFS_SMB311
310 { Smb_311, SMB311_VERSION_STRING },
311 { Smb_311, ALT_SMB311_VERSION_STRING },
313 { Smb_3any, SMB3ANY_VERSION_STRING },
314 { Smb_default, SMBDEFAULT_VERSION_STRING },
315 { Smb_version_err, NULL }
318 static int ip_connect(struct TCP_Server_Info *server);
319 static int generic_ip_connect(struct TCP_Server_Info *server);
320 static void tlink_rb_insert(struct rb_root *root, struct tcon_link *new_tlink);
321 static void cifs_prune_tlinks(struct work_struct *work);
322 static int cifs_setup_volume_info(struct smb_vol *volume_info, char *mount_data,
323 const char *devname, bool is_smb3);
326 * cifs tcp session reconnection
328 * mark tcp session as reconnecting so temporarily locked
329 * mark all smb sessions as reconnecting for tcp session
330 * reconnect tcp session
331 * wake up waiters on reconnection? - (not needed currently)
334 cifs_reconnect(struct TCP_Server_Info *server)
337 struct list_head *tmp, *tmp2;
338 struct cifs_ses *ses;
339 struct cifs_tcon *tcon;
340 struct mid_q_entry *mid_entry;
341 struct list_head retry_list;
343 spin_lock(&GlobalMid_Lock);
344 if (server->tcpStatus == CifsExiting) {
345 /* the demux thread will exit normally
346 next time through the loop */
347 spin_unlock(&GlobalMid_Lock);
350 server->tcpStatus = CifsNeedReconnect;
351 spin_unlock(&GlobalMid_Lock);
353 server->max_read = 0;
355 cifs_dbg(FYI, "Reconnecting tcp session\n");
357 /* before reconnecting the tcp session, mark the smb session (uid)
358 and the tid bad so they are not used until reconnected */
359 cifs_dbg(FYI, "%s: marking sessions and tcons for reconnect\n",
361 spin_lock(&cifs_tcp_ses_lock);
362 list_for_each(tmp, &server->smb_ses_list) {
363 ses = list_entry(tmp, struct cifs_ses, smb_ses_list);
364 ses->need_reconnect = true;
365 list_for_each(tmp2, &ses->tcon_list) {
366 tcon = list_entry(tmp2, struct cifs_tcon, tcon_list);
367 tcon->need_reconnect = true;
370 ses->tcon_ipc->need_reconnect = true;
372 spin_unlock(&cifs_tcp_ses_lock);
374 /* do not want to be sending data on a socket we are freeing */
375 cifs_dbg(FYI, "%s: tearing down socket\n", __func__);
376 mutex_lock(&server->srv_mutex);
377 if (server->ssocket) {
378 cifs_dbg(FYI, "State: 0x%x Flags: 0x%lx\n",
379 server->ssocket->state, server->ssocket->flags);
380 kernel_sock_shutdown(server->ssocket, SHUT_WR);
381 cifs_dbg(FYI, "Post shutdown state: 0x%x Flags: 0x%lx\n",
382 server->ssocket->state, server->ssocket->flags);
383 sock_release(server->ssocket);
384 server->ssocket = NULL;
386 server->sequence_number = 0;
387 server->session_estab = false;
388 kfree(server->session_key.response);
389 server->session_key.response = NULL;
390 server->session_key.len = 0;
391 server->lstrp = jiffies;
393 /* mark submitted MIDs for retry and issue callback */
394 INIT_LIST_HEAD(&retry_list);
395 cifs_dbg(FYI, "%s: moving mids to private list\n", __func__);
396 spin_lock(&GlobalMid_Lock);
397 list_for_each_safe(tmp, tmp2, &server->pending_mid_q) {
398 mid_entry = list_entry(tmp, struct mid_q_entry, qhead);
399 if (mid_entry->mid_state == MID_REQUEST_SUBMITTED)
400 mid_entry->mid_state = MID_RETRY_NEEDED;
401 list_move(&mid_entry->qhead, &retry_list);
403 spin_unlock(&GlobalMid_Lock);
404 mutex_unlock(&server->srv_mutex);
406 cifs_dbg(FYI, "%s: issuing mid callbacks\n", __func__);
407 list_for_each_safe(tmp, tmp2, &retry_list) {
408 mid_entry = list_entry(tmp, struct mid_q_entry, qhead);
409 list_del_init(&mid_entry->qhead);
410 mid_entry->callback(mid_entry);
416 /* we should try only the port we connected to before */
417 mutex_lock(&server->srv_mutex);
418 if (cifs_rdma_enabled(server))
419 rc = smbd_reconnect(server);
421 rc = generic_ip_connect(server);
423 cifs_dbg(FYI, "reconnect error %d\n", rc);
424 mutex_unlock(&server->srv_mutex);
427 atomic_inc(&tcpSesReconnectCount);
428 spin_lock(&GlobalMid_Lock);
429 if (server->tcpStatus != CifsExiting)
430 server->tcpStatus = CifsNeedNegotiate;
431 spin_unlock(&GlobalMid_Lock);
432 mutex_unlock(&server->srv_mutex);
434 } while (server->tcpStatus == CifsNeedReconnect);
436 if (server->tcpStatus == CifsNeedNegotiate)
437 mod_delayed_work(cifsiod_wq, &server->echo, 0);
443 cifs_echo_request(struct work_struct *work)
446 struct TCP_Server_Info *server = container_of(work,
447 struct TCP_Server_Info, echo.work);
448 unsigned long echo_interval;
451 * If we need to renegotiate, set echo interval to zero to
452 * immediately call echo service where we can renegotiate.
454 if (server->tcpStatus == CifsNeedNegotiate)
457 echo_interval = server->echo_interval;
460 * We cannot send an echo if it is disabled.
461 * Also, no need to ping if we got a response recently.
464 if (server->tcpStatus == CifsNeedReconnect ||
465 server->tcpStatus == CifsExiting ||
466 server->tcpStatus == CifsNew ||
467 (server->ops->can_echo && !server->ops->can_echo(server)) ||
468 time_before(jiffies, server->lstrp + echo_interval - HZ))
471 rc = server->ops->echo ? server->ops->echo(server) : -ENOSYS;
473 cifs_dbg(FYI, "Unable to send echo request to server: %s\n",
477 queue_delayed_work(cifsiod_wq, &server->echo, server->echo_interval);
481 allocate_buffers(struct TCP_Server_Info *server)
483 if (!server->bigbuf) {
484 server->bigbuf = (char *)cifs_buf_get();
485 if (!server->bigbuf) {
486 cifs_dbg(VFS, "No memory for large SMB response\n");
488 /* retry will check if exiting */
491 } else if (server->large_buf) {
492 /* we are reusing a dirty large buf, clear its start */
493 memset(server->bigbuf, 0, HEADER_SIZE(server));
496 if (!server->smallbuf) {
497 server->smallbuf = (char *)cifs_small_buf_get();
498 if (!server->smallbuf) {
499 cifs_dbg(VFS, "No memory for SMB response\n");
501 /* retry will check if exiting */
504 /* beginning of smb buffer is cleared in our buf_get */
506 /* if existing small buf clear beginning */
507 memset(server->smallbuf, 0, HEADER_SIZE(server));
514 server_unresponsive(struct TCP_Server_Info *server)
517 * We need to wait 2 echo intervals to make sure we handle such
519 * 1s client sends a normal SMB request
520 * 2s client gets a response
521 * 30s echo workqueue job pops, and decides we got a response recently
522 * and don't need to send another
524 * 65s kernel_recvmsg times out, and we see that we haven't gotten
525 * a response in >60s.
527 if ((server->tcpStatus == CifsGood ||
528 server->tcpStatus == CifsNeedNegotiate) &&
529 time_after(jiffies, server->lstrp + 2 * server->echo_interval)) {
530 cifs_dbg(VFS, "Server %s has not responded in %lu seconds. Reconnecting...\n",
531 server->hostname, (2 * server->echo_interval) / HZ);
532 cifs_reconnect(server);
533 wake_up(&server->response_q);
541 cifs_readv_from_socket(struct TCP_Server_Info *server, struct msghdr *smb_msg)
546 smb_msg->msg_control = NULL;
547 smb_msg->msg_controllen = 0;
549 for (total_read = 0; msg_data_left(smb_msg); total_read += length) {
552 if (server_unresponsive(server))
553 return -ECONNABORTED;
554 if (cifs_rdma_enabled(server) && server->smbd_conn)
555 length = smbd_recv(server->smbd_conn, smb_msg);
557 length = sock_recvmsg(server->ssocket, smb_msg, 0);
559 if (server->tcpStatus == CifsExiting)
562 if (server->tcpStatus == CifsNeedReconnect) {
563 cifs_reconnect(server);
564 return -ECONNABORTED;
567 if (length == -ERESTARTSYS ||
571 * Minimum sleep to prevent looping, allowing socket
572 * to clear and app threads to set tcpStatus
573 * CifsNeedReconnect if server hung.
575 usleep_range(1000, 2000);
581 cifs_dbg(FYI, "Received no data or error: %d\n", length);
582 cifs_reconnect(server);
583 return -ECONNABORTED;
590 cifs_read_from_socket(struct TCP_Server_Info *server, char *buf,
591 unsigned int to_read)
593 struct msghdr smb_msg;
594 struct kvec iov = {.iov_base = buf, .iov_len = to_read};
595 iov_iter_kvec(&smb_msg.msg_iter, READ | ITER_KVEC, &iov, 1, to_read);
597 return cifs_readv_from_socket(server, &smb_msg);
601 cifs_read_page_from_socket(struct TCP_Server_Info *server, struct page *page,
602 unsigned int page_offset, unsigned int to_read)
604 struct msghdr smb_msg;
605 struct bio_vec bv = {
606 .bv_page = page, .bv_len = to_read, .bv_offset = page_offset};
607 iov_iter_bvec(&smb_msg.msg_iter, READ | ITER_BVEC, &bv, 1, to_read);
608 return cifs_readv_from_socket(server, &smb_msg);
612 is_smb_response(struct TCP_Server_Info *server, unsigned char type)
615 * The first byte big endian of the length field,
616 * is actually not part of the length but the type
617 * with the most common, zero, as regular data.
620 case RFC1002_SESSION_MESSAGE:
621 /* Regular SMB response */
623 case RFC1002_SESSION_KEEP_ALIVE:
624 cifs_dbg(FYI, "RFC 1002 session keep alive\n");
626 case RFC1002_POSITIVE_SESSION_RESPONSE:
627 cifs_dbg(FYI, "RFC 1002 positive session response\n");
629 case RFC1002_NEGATIVE_SESSION_RESPONSE:
631 * We get this from Windows 98 instead of an error on
632 * SMB negprot response.
634 cifs_dbg(FYI, "RFC 1002 negative session response\n");
635 /* give server a second to clean up */
638 * Always try 445 first on reconnect since we get NACK
639 * on some if we ever connected to port 139 (the NACK
640 * is since we do not begin with RFC1001 session
643 cifs_set_port((struct sockaddr *)&server->dstaddr, CIFS_PORT);
644 cifs_reconnect(server);
645 wake_up(&server->response_q);
648 cifs_dbg(VFS, "RFC 1002 unknown response type 0x%x\n", type);
649 cifs_reconnect(server);
656 dequeue_mid(struct mid_q_entry *mid, bool malformed)
658 #ifdef CONFIG_CIFS_STATS2
659 mid->when_received = jiffies;
661 spin_lock(&GlobalMid_Lock);
663 mid->mid_state = MID_RESPONSE_RECEIVED;
665 mid->mid_state = MID_RESPONSE_MALFORMED;
666 list_del_init(&mid->qhead);
667 spin_unlock(&GlobalMid_Lock);
671 handle_mid(struct mid_q_entry *mid, struct TCP_Server_Info *server,
672 char *buf, int malformed)
674 if (server->ops->check_trans2 &&
675 server->ops->check_trans2(mid, server, buf, malformed))
678 mid->large_buf = server->large_buf;
679 /* Was previous buf put in mpx struct for multi-rsp? */
680 if (!mid->multiRsp) {
681 /* smb buffer will be freed by user thread */
682 if (server->large_buf)
683 server->bigbuf = NULL;
685 server->smallbuf = NULL;
687 dequeue_mid(mid, malformed);
690 static void clean_demultiplex_info(struct TCP_Server_Info *server)
694 /* take it off the list, if it's not already */
695 spin_lock(&cifs_tcp_ses_lock);
696 list_del_init(&server->tcp_ses_list);
697 spin_unlock(&cifs_tcp_ses_lock);
699 spin_lock(&GlobalMid_Lock);
700 server->tcpStatus = CifsExiting;
701 spin_unlock(&GlobalMid_Lock);
702 wake_up_all(&server->response_q);
704 /* check if we have blocked requests that need to free */
705 spin_lock(&server->req_lock);
706 if (server->credits <= 0)
708 spin_unlock(&server->req_lock);
710 * Although there should not be any requests blocked on this queue it
711 * can not hurt to be paranoid and try to wake up requests that may
712 * haven been blocked when more than 50 at time were on the wire to the
713 * same server - they now will see the session is in exit state and get
714 * out of SendReceive.
716 wake_up_all(&server->request_q);
717 /* give those requests time to exit */
719 if (cifs_rdma_enabled(server) && server->smbd_conn) {
720 smbd_destroy(server->smbd_conn);
721 server->smbd_conn = NULL;
723 if (server->ssocket) {
724 sock_release(server->ssocket);
725 server->ssocket = NULL;
728 if (!list_empty(&server->pending_mid_q)) {
729 struct list_head dispose_list;
730 struct mid_q_entry *mid_entry;
731 struct list_head *tmp, *tmp2;
733 INIT_LIST_HEAD(&dispose_list);
734 spin_lock(&GlobalMid_Lock);
735 list_for_each_safe(tmp, tmp2, &server->pending_mid_q) {
736 mid_entry = list_entry(tmp, struct mid_q_entry, qhead);
737 cifs_dbg(FYI, "Clearing mid 0x%llx\n", mid_entry->mid);
738 mid_entry->mid_state = MID_SHUTDOWN;
739 list_move(&mid_entry->qhead, &dispose_list);
741 spin_unlock(&GlobalMid_Lock);
743 /* now walk dispose list and issue callbacks */
744 list_for_each_safe(tmp, tmp2, &dispose_list) {
745 mid_entry = list_entry(tmp, struct mid_q_entry, qhead);
746 cifs_dbg(FYI, "Callback mid 0x%llx\n", mid_entry->mid);
747 list_del_init(&mid_entry->qhead);
748 mid_entry->callback(mid_entry);
750 /* 1/8th of sec is more than enough time for them to exit */
754 if (!list_empty(&server->pending_mid_q)) {
756 * mpx threads have not exited yet give them at least the smb
757 * send timeout time for long ops.
759 * Due to delays on oplock break requests, we need to wait at
760 * least 45 seconds before giving up on a request getting a
761 * response and going ahead and killing cifsd.
763 cifs_dbg(FYI, "Wait for exit from demultiplex thread\n");
766 * If threads still have not exited they are probably never
767 * coming home not much else we can do but free the memory.
771 kfree(server->hostname);
774 length = atomic_dec_return(&tcpSesAllocCount);
776 mempool_resize(cifs_req_poolp, length + cifs_min_rcv);
780 standard_receive3(struct TCP_Server_Info *server, struct mid_q_entry *mid)
783 char *buf = server->smallbuf;
784 unsigned int pdu_length = server->pdu_size;
786 /* make sure this will fit in a large buffer */
787 if (pdu_length > CIFSMaxBufSize + MAX_HEADER_SIZE(server) -
788 server->vals->header_preamble_size) {
789 cifs_dbg(VFS, "SMB response too long (%u bytes)\n", pdu_length);
790 cifs_reconnect(server);
791 wake_up(&server->response_q);
792 return -ECONNABORTED;
795 /* switch to large buffer if too big for a small one */
796 if (pdu_length > MAX_CIFS_SMALL_BUFFER_SIZE - 4) {
797 server->large_buf = true;
798 memcpy(server->bigbuf, buf, server->total_read);
799 buf = server->bigbuf;
802 /* now read the rest */
803 length = cifs_read_from_socket(server, buf + HEADER_SIZE(server) - 1,
804 pdu_length - HEADER_SIZE(server) + 1
805 + server->vals->header_preamble_size);
809 server->total_read += length;
811 dump_smb(buf, server->total_read);
813 return cifs_handle_standard(server, mid);
817 cifs_handle_standard(struct TCP_Server_Info *server, struct mid_q_entry *mid)
819 char *buf = server->large_buf ? server->bigbuf : server->smallbuf;
823 * We know that we received enough to get to the MID as we
824 * checked the pdu_length earlier. Now check to see
825 * if the rest of the header is OK. We borrow the length
826 * var for the rest of the loop to avoid a new stack var.
828 * 48 bytes is enough to display the header and a little bit
829 * into the payload for debugging purposes.
831 length = server->ops->check_message(buf, server->total_read, server);
833 cifs_dump_mem("Bad SMB: ", buf,
834 min_t(unsigned int, server->total_read, 48));
836 if (server->ops->is_session_expired &&
837 server->ops->is_session_expired(buf)) {
838 cifs_reconnect(server);
839 wake_up(&server->response_q);
843 if (server->ops->is_status_pending &&
844 server->ops->is_status_pending(buf, server, length))
850 handle_mid(mid, server, buf, length);
855 cifs_demultiplex_thread(void *p)
858 struct TCP_Server_Info *server = p;
859 unsigned int pdu_length;
860 unsigned int next_offset;
862 struct task_struct *task_to_wake = NULL;
863 struct mid_q_entry *mid_entry;
865 current->flags |= PF_MEMALLOC;
866 cifs_dbg(FYI, "Demultiplex PID: %d\n", task_pid_nr(current));
868 length = atomic_inc_return(&tcpSesAllocCount);
870 mempool_resize(cifs_req_poolp, length + cifs_min_rcv);
873 while (server->tcpStatus != CifsExiting) {
877 if (!allocate_buffers(server))
880 server->large_buf = false;
881 buf = server->smallbuf;
882 pdu_length = 4; /* enough to get RFC1001 header */
884 length = cifs_read_from_socket(server, buf, pdu_length);
888 if (server->vals->header_preamble_size == 0)
889 server->total_read = 0;
891 server->total_read = length;
894 * The right amount was read from socket - 4 bytes,
895 * so we can now interpret the length field.
897 pdu_length = get_rfc1002_length(buf);
899 cifs_dbg(FYI, "RFC1002 header 0x%x\n", pdu_length);
900 if (!is_smb_response(server, buf[0]))
903 server->pdu_size = pdu_length;
905 /* make sure we have enough to get to the MID */
906 if (server->pdu_size < HEADER_SIZE(server) - 1 -
907 server->vals->header_preamble_size) {
908 cifs_dbg(VFS, "SMB response too short (%u bytes)\n",
910 cifs_reconnect(server);
911 wake_up(&server->response_q);
915 /* read down to the MID */
916 length = cifs_read_from_socket(server,
917 buf + server->vals->header_preamble_size,
918 HEADER_SIZE(server) - 1
919 - server->vals->header_preamble_size);
922 server->total_read += length;
924 if (server->ops->next_header) {
925 next_offset = server->ops->next_header(buf);
927 server->pdu_size = next_offset;
930 if (server->ops->is_transform_hdr &&
931 server->ops->receive_transform &&
932 server->ops->is_transform_hdr(buf)) {
933 length = server->ops->receive_transform(server,
936 mid_entry = server->ops->find_mid(server, buf);
938 if (!mid_entry || !mid_entry->receive)
939 length = standard_receive3(server, mid_entry);
941 length = mid_entry->receive(server, mid_entry);
947 if (server->large_buf)
948 buf = server->bigbuf;
950 server->lstrp = jiffies;
951 if (mid_entry != NULL) {
952 mid_entry->resp_buf_size = server->pdu_size;
953 if ((mid_entry->mid_flags & MID_WAIT_CANCELLED) &&
954 mid_entry->mid_state == MID_RESPONSE_RECEIVED &&
955 server->ops->handle_cancelled_mid)
956 server->ops->handle_cancelled_mid(
960 if (!mid_entry->multiRsp || mid_entry->multiEnd)
961 mid_entry->callback(mid_entry);
962 } else if (server->ops->is_oplock_break &&
963 server->ops->is_oplock_break(buf, server)) {
964 cifs_dbg(FYI, "Received oplock break\n");
966 cifs_dbg(VFS, "No task to wake, unknown frame received! NumMids %d\n",
967 atomic_read(&midCount));
968 cifs_dump_mem("Received Data is: ", buf,
969 HEADER_SIZE(server));
970 #ifdef CONFIG_CIFS_DEBUG2
971 if (server->ops->dump_detail)
972 server->ops->dump_detail(buf, server);
973 cifs_dump_mids(server);
974 #endif /* CIFS_DEBUG2 */
976 if (pdu_length > server->pdu_size) {
977 if (!allocate_buffers(server))
979 pdu_length -= server->pdu_size;
980 server->total_read = 0;
981 server->large_buf = false;
982 buf = server->smallbuf;
985 } /* end while !EXITING */
987 /* buffer usually freed in free_mid - need to free it here on exit */
988 cifs_buf_release(server->bigbuf);
989 if (server->smallbuf) /* no sense logging a debug message if NULL */
990 cifs_small_buf_release(server->smallbuf);
992 task_to_wake = xchg(&server->tsk, NULL);
993 clean_demultiplex_info(server);
995 /* if server->tsk was NULL then wait for a signal before exiting */
997 set_current_state(TASK_INTERRUPTIBLE);
998 while (!signal_pending(current)) {
1000 set_current_state(TASK_INTERRUPTIBLE);
1002 set_current_state(TASK_RUNNING);
1005 module_put_and_exit(0);
1008 /* extract the host portion of the UNC string */
1010 extract_hostname(const char *unc)
1016 /* skip double chars at beginning of string */
1017 /* BB: check validity of these bytes? */
1020 /* delimiter between hostname and sharename is always '\\' now */
1021 delim = strchr(src, '\\');
1023 return ERR_PTR(-EINVAL);
1026 dst = kmalloc((len + 1), GFP_KERNEL);
1028 return ERR_PTR(-ENOMEM);
1030 memcpy(dst, src, len);
1036 static int get_option_ul(substring_t args[], unsigned long *option)
1041 string = match_strdup(args);
1044 rc = kstrtoul(string, 0, option);
1050 static int get_option_uid(substring_t args[], kuid_t *result)
1052 unsigned long value;
1056 rc = get_option_ul(args, &value);
1060 uid = make_kuid(current_user_ns(), value);
1061 if (!uid_valid(uid))
1068 static int get_option_gid(substring_t args[], kgid_t *result)
1070 unsigned long value;
1074 rc = get_option_ul(args, &value);
1078 gid = make_kgid(current_user_ns(), value);
1079 if (!gid_valid(gid))
1086 static int cifs_parse_security_flavors(char *value,
1087 struct smb_vol *vol)
1090 substring_t args[MAX_OPT_ARGS];
1093 * With mount options, the last one should win. Reset any existing
1094 * settings back to default.
1096 vol->sectype = Unspecified;
1099 switch (match_token(value, cifs_secflavor_tokens, args)) {
1101 cifs_dbg(VFS, "sec=krb5p is not supported!\n");
1107 vol->sectype = Kerberos;
1109 case Opt_sec_ntlmsspi:
1112 case Opt_sec_ntlmssp:
1113 vol->sectype = RawNTLMSSP;
1119 vol->sectype = NTLM;
1121 case Opt_sec_ntlmv2i:
1124 case Opt_sec_ntlmv2:
1125 vol->sectype = NTLMv2;
1127 #ifdef CONFIG_CIFS_WEAK_PW_HASH
1128 case Opt_sec_lanman:
1129 vol->sectype = LANMAN;
1136 cifs_dbg(VFS, "bad security option: %s\n", value);
1144 cifs_parse_cache_flavor(char *value, struct smb_vol *vol)
1146 substring_t args[MAX_OPT_ARGS];
1148 switch (match_token(value, cifs_cacheflavor_tokens, args)) {
1149 case Opt_cache_loose:
1150 vol->direct_io = false;
1151 vol->strict_io = false;
1153 case Opt_cache_strict:
1154 vol->direct_io = false;
1155 vol->strict_io = true;
1157 case Opt_cache_none:
1158 vol->direct_io = true;
1159 vol->strict_io = false;
1162 cifs_dbg(VFS, "bad cache= option: %s\n", value);
1169 cifs_parse_smb_version(char *value, struct smb_vol *vol, bool is_smb3)
1171 substring_t args[MAX_OPT_ARGS];
1173 switch (match_token(value, cifs_smb_version_tokens, args)) {
1175 if (disable_legacy_dialects) {
1176 cifs_dbg(VFS, "mount with legacy dialect disabled\n");
1180 cifs_dbg(VFS, "vers=1.0 (cifs) not permitted when mounting with smb3\n");
1183 vol->ops = &smb1_operations;
1184 vol->vals = &smb1_values;
1187 if (disable_legacy_dialects) {
1188 cifs_dbg(VFS, "mount with legacy dialect disabled\n");
1192 cifs_dbg(VFS, "vers=2.0 not permitted when mounting with smb3\n");
1195 vol->ops = &smb20_operations;
1196 vol->vals = &smb20_values;
1199 vol->ops = &smb21_operations;
1200 vol->vals = &smb21_values;
1203 vol->ops = &smb30_operations;
1204 vol->vals = &smb30_values;
1207 vol->ops = &smb30_operations; /* currently identical with 3.0 */
1208 vol->vals = &smb302_values;
1210 #ifdef CONFIG_CIFS_SMB311
1212 vol->ops = &smb311_operations;
1213 vol->vals = &smb311_values;
1217 vol->ops = &smb30_operations; /* currently identical with 3.0 */
1218 vol->vals = &smb3any_values;
1221 vol->ops = &smb30_operations; /* currently identical with 3.0 */
1222 vol->vals = &smbdefault_values;
1225 cifs_dbg(VFS, "Unknown vers= option specified: %s\n", value);
1232 * Parse a devname into substrings and populate the vol->UNC and vol->prepath
1233 * fields with the result. Returns 0 on success and an error otherwise.
1236 cifs_parse_devname(const char *devname, struct smb_vol *vol)
1239 const char *delims = "/\\";
1242 /* make sure we have a valid UNC double delimiter prefix */
1243 len = strspn(devname, delims);
1247 /* find delimiter between host and sharename */
1248 pos = strpbrk(devname + 2, delims);
1252 /* skip past delimiter */
1255 /* now go until next delimiter or end of string */
1256 len = strcspn(pos, delims);
1258 /* move "pos" up to delimiter or NULL */
1260 vol->UNC = kstrndup(devname, pos - devname, GFP_KERNEL);
1264 convert_delimiter(vol->UNC, '\\');
1266 /* skip any delimiter */
1267 if (*pos == '/' || *pos == '\\')
1270 /* If pos is NULL then no prepath */
1274 vol->prepath = kstrdup(pos, GFP_KERNEL);
1282 cifs_parse_mount_options(const char *mountdata, const char *devname,
1283 struct smb_vol *vol, bool is_smb3)
1286 char *mountdata_copy = NULL, *options;
1287 unsigned int temp_len, i, j;
1289 short int override_uid = -1;
1290 short int override_gid = -1;
1291 bool uid_specified = false;
1292 bool gid_specified = false;
1293 bool sloppy = false;
1294 char *invalid = NULL;
1295 char *nodename = utsname()->nodename;
1296 char *string = NULL;
1297 char *tmp_end, *value;
1299 bool got_ip = false;
1300 bool got_version = false;
1301 unsigned short port = 0;
1302 struct sockaddr *dstaddr = (struct sockaddr *)&vol->dstaddr;
1306 delim = separator[0];
1308 /* ensure we always start with zeroed-out smb_vol */
1309 memset(vol, 0, sizeof(*vol));
1312 * does not have to be perfect mapping since field is
1313 * informational, only used for servers that do not support
1314 * port 445 and it can be overridden at mount time
1316 memset(vol->source_rfc1001_name, 0x20, RFC1001_NAME_LEN);
1317 for (i = 0; i < strnlen(nodename, RFC1001_NAME_LEN); i++)
1318 vol->source_rfc1001_name[i] = toupper(nodename[i]);
1320 vol->source_rfc1001_name[RFC1001_NAME_LEN] = 0;
1321 /* null target name indicates to use *SMBSERVR default called name
1322 if we end up sending RFC1001 session initialize */
1323 vol->target_rfc1001_name[0] = 0;
1324 vol->cred_uid = current_uid();
1325 vol->linux_uid = current_uid();
1326 vol->linux_gid = current_gid();
1329 * default to SFM style remapping of seven reserved characters
1330 * unless user overrides it or we negotiate CIFS POSIX where
1331 * it is unnecessary. Can not simultaneously use more than one mapping
1332 * since then readdir could list files that open could not open
1336 /* default to only allowing write access to owner of the mount */
1337 vol->dir_mode = vol->file_mode = S_IRUGO | S_IXUGO | S_IWUSR;
1339 /* vol->retry default is 0 (i.e. "soft" limited retry not hard retry) */
1340 /* default is always to request posix paths. */
1341 vol->posix_paths = 1;
1342 /* default to using server inode numbers where available */
1343 vol->server_ino = 1;
1345 /* default is to use strict cifs caching semantics */
1346 vol->strict_io = true;
1348 vol->actimeo = CIFS_DEF_ACTIMEO;
1350 /* offer SMB2.1 and later (SMB3 etc). Secure and widely accepted */
1351 vol->ops = &smb30_operations;
1352 vol->vals = &smbdefault_values;
1354 vol->echo_interval = SMB_ECHO_INTERVAL_DEFAULT;
1357 goto cifs_parse_mount_err;
1359 mountdata_copy = kstrndup(mountdata, PAGE_SIZE, GFP_KERNEL);
1360 if (!mountdata_copy)
1361 goto cifs_parse_mount_err;
1363 options = mountdata_copy;
1364 end = options + strlen(options);
1366 if (strncmp(options, "sep=", 4) == 0) {
1367 if (options[4] != 0) {
1368 separator[0] = options[4];
1371 cifs_dbg(FYI, "Null separator not allowed\n");
1374 vol->backupuid_specified = false; /* no backup intent for a user */
1375 vol->backupgid_specified = false; /* no backup intent for a group */
1377 switch (cifs_parse_devname(devname, vol)) {
1381 cifs_dbg(VFS, "Unable to allocate memory for devname.\n");
1382 goto cifs_parse_mount_err;
1384 cifs_dbg(VFS, "Malformed UNC in devname.\n");
1385 goto cifs_parse_mount_err;
1387 cifs_dbg(VFS, "Unknown error parsing devname.\n");
1388 goto cifs_parse_mount_err;
1391 while ((data = strsep(&options, separator)) != NULL) {
1392 substring_t args[MAX_OPT_ARGS];
1393 unsigned long option;
1399 token = match_token(data, cifs_mount_option_tokens, args);
1403 /* Ingnore the following */
1407 /* Boolean values */
1408 case Opt_user_xattr:
1411 case Opt_nouser_xattr:
1417 case Opt_noforceuid:
1423 case Opt_noforcegid:
1426 case Opt_noblocksend:
1427 vol->noblocksnd = 1;
1429 case Opt_noautotune:
1430 vol->noautotune = 1;
1445 vol->sfu_remap = true;
1446 vol->remap = false; /* disable SFM mapping */
1448 case Opt_nomapchars:
1449 vol->sfu_remap = false;
1453 vol->sfu_remap = false; /* disable SFU mapping */
1455 case Opt_nomapposix:
1467 case Opt_posixpaths:
1468 vol->posix_paths = 1;
1470 case Opt_noposixpaths:
1471 vol->posix_paths = 0;
1476 "conflicting unix mount options\n");
1477 vol->no_linux_ext = 1;
1480 if (vol->no_linux_ext)
1482 "conflicting unix mount options\n");
1494 * turn off mandatory locking in mode
1495 * if remote locking is turned off since the
1496 * local vfs will do advisory
1498 if (vol->file_mode ==
1499 (S_IALLUGO & ~(S_ISUID | S_IXGRP)))
1500 vol->file_mode = S_IALLUGO;
1502 case Opt_nohandlecache:
1503 vol->nohandlecache = 1;
1505 case Opt_handlecache:
1506 vol->nohandlecache = 0;
1508 case Opt_forcemandatorylock:
1517 case Opt_setuidfromacl:
1518 vol->setuidfromacl = 1;
1521 vol->dynperm = true;
1524 vol->dynperm = false;
1538 case Opt_nostrictsync:
1539 vol->nostrictsync = 1;
1541 case Opt_strictsync:
1542 vol->nostrictsync = 0;
1545 vol->server_ino = 1;
1547 case Opt_noserverino:
1548 vol->server_ino = 0;
1550 case Opt_rwpidforward:
1551 vol->rwpidforward = 1;
1560 vol->no_psx_acl = 0;
1563 vol->no_psx_acl = 1;
1565 case Opt_locallease:
1566 vol->local_lease = 1;
1572 /* we do not do the following in secFlags because seal
1573 * is a per tree connection (mount) not a per socket
1574 * or per-smb connection option in the protocol
1575 * vol->secFlg |= CIFSSEC_MUST_SEAL;
1580 pr_warn("CIFS: Mount option noac not supported. Instead set /proc/fs/cifs/LookupCacheEnabled to 0\n");
1583 #ifndef CONFIG_CIFS_FSCACHE
1584 cifs_dbg(VFS, "FS-Cache support needs CONFIG_CIFS_FSCACHE kernel config option set\n");
1585 goto cifs_parse_mount_err;
1589 case Opt_mfsymlinks:
1590 vol->mfsymlinks = true;
1593 vol->multiuser = true;
1598 case Opt_nosharesock:
1599 vol->nosharesock = true;
1601 case Opt_nopersistent:
1602 vol->nopersistent = true;
1603 if (vol->persistent) {
1605 "persistenthandles mount options conflict\n");
1606 goto cifs_parse_mount_err;
1609 case Opt_persistent:
1610 vol->persistent = true;
1611 if ((vol->nopersistent) || (vol->resilient)) {
1613 "persistenthandles mount options conflict\n");
1614 goto cifs_parse_mount_err;
1618 vol->resilient = true;
1619 if (vol->persistent) {
1621 "persistenthandles mount options conflict\n");
1622 goto cifs_parse_mount_err;
1625 case Opt_noresilient:
1626 vol->resilient = false; /* already the default */
1628 case Opt_domainauto:
1629 vol->domainauto = true;
1635 /* Numeric Values */
1637 if (get_option_uid(args, &vol->backupuid)) {
1638 cifs_dbg(VFS, "%s: Invalid backupuid value\n",
1640 goto cifs_parse_mount_err;
1642 vol->backupuid_specified = true;
1645 if (get_option_gid(args, &vol->backupgid)) {
1646 cifs_dbg(VFS, "%s: Invalid backupgid value\n",
1648 goto cifs_parse_mount_err;
1650 vol->backupgid_specified = true;
1653 if (get_option_uid(args, &vol->linux_uid)) {
1654 cifs_dbg(VFS, "%s: Invalid uid value\n",
1656 goto cifs_parse_mount_err;
1658 uid_specified = true;
1661 if (get_option_uid(args, &vol->cred_uid)) {
1662 cifs_dbg(VFS, "%s: Invalid cruid value\n",
1664 goto cifs_parse_mount_err;
1668 if (get_option_gid(args, &vol->linux_gid)) {
1669 cifs_dbg(VFS, "%s: Invalid gid value\n",
1671 goto cifs_parse_mount_err;
1673 gid_specified = true;
1676 if (get_option_ul(args, &option)) {
1677 cifs_dbg(VFS, "%s: Invalid file_mode value\n",
1679 goto cifs_parse_mount_err;
1681 vol->file_mode = option;
1684 if (get_option_ul(args, &option)) {
1685 cifs_dbg(VFS, "%s: Invalid dir_mode value\n",
1687 goto cifs_parse_mount_err;
1689 vol->dir_mode = option;
1692 if (get_option_ul(args, &option) ||
1693 option > USHRT_MAX) {
1694 cifs_dbg(VFS, "%s: Invalid port value\n",
1696 goto cifs_parse_mount_err;
1698 port = (unsigned short)option;
1701 if (get_option_ul(args, &option)) {
1702 cifs_dbg(VFS, "%s: Invalid rsize value\n",
1704 goto cifs_parse_mount_err;
1706 vol->rsize = option;
1709 if (get_option_ul(args, &option)) {
1710 cifs_dbg(VFS, "%s: Invalid wsize value\n",
1712 goto cifs_parse_mount_err;
1714 vol->wsize = option;
1717 if (get_option_ul(args, &option)) {
1718 cifs_dbg(VFS, "%s: Invalid actimeo value\n",
1720 goto cifs_parse_mount_err;
1722 vol->actimeo = HZ * option;
1723 if (vol->actimeo > CIFS_MAX_ACTIMEO) {
1724 cifs_dbg(VFS, "attribute cache timeout too large\n");
1725 goto cifs_parse_mount_err;
1728 case Opt_echo_interval:
1729 if (get_option_ul(args, &option)) {
1730 cifs_dbg(VFS, "%s: Invalid echo interval value\n",
1732 goto cifs_parse_mount_err;
1734 vol->echo_interval = option;
1737 if (get_option_ul(args, &option)) {
1738 cifs_dbg(VFS, "%s: Invalid snapshot time\n",
1740 goto cifs_parse_mount_err;
1742 vol->snapshot_time = option;
1744 case Opt_max_credits:
1745 if (get_option_ul(args, &option) || (option < 20) ||
1747 cifs_dbg(VFS, "%s: Invalid max_credits value\n",
1749 goto cifs_parse_mount_err;
1751 vol->max_credits = option;
1754 /* String Arguments */
1756 case Opt_blank_user:
1757 /* null user, ie. anonymous authentication */
1759 vol->username = NULL;
1762 string = match_strdup(args);
1766 if (strnlen(string, CIFS_MAX_USERNAME_LEN) >
1767 CIFS_MAX_USERNAME_LEN) {
1768 pr_warn("CIFS: username too long\n");
1769 goto cifs_parse_mount_err;
1772 kfree(vol->username);
1773 vol->username = kstrdup(string, GFP_KERNEL);
1775 goto cifs_parse_mount_err;
1777 case Opt_blank_pass:
1778 /* passwords have to be handled differently
1779 * to allow the character used for deliminator
1780 * to be passed within them
1784 * Check if this is a case where the password
1785 * starts with a delimiter
1787 tmp_end = strchr(data, '=');
1789 if (!(tmp_end < end && tmp_end[1] == delim)) {
1790 /* No it is not. Set the password to NULL */
1791 kzfree(vol->password);
1792 vol->password = NULL;
1795 /* Yes it is. Drop down to Opt_pass below.*/
1797 /* Obtain the value string */
1798 value = strchr(data, '=');
1801 /* Set tmp_end to end of the string */
1802 tmp_end = (char *) value + strlen(value);
1804 /* Check if following character is the deliminator
1805 * If yes, we have encountered a double deliminator
1806 * reset the NULL character to the deliminator
1808 if (tmp_end < end && tmp_end[1] == delim) {
1811 /* Keep iterating until we get to a single
1812 * deliminator OR the end
1814 while ((tmp_end = strchr(tmp_end, delim))
1815 != NULL && (tmp_end[1] == delim)) {
1816 tmp_end = (char *) &tmp_end[2];
1819 /* Reset var options to point to next element */
1822 options = (char *) &tmp_end[1];
1824 /* Reached the end of the mount option
1829 kzfree(vol->password);
1830 /* Now build new password string */
1831 temp_len = strlen(value);
1832 vol->password = kzalloc(temp_len+1, GFP_KERNEL);
1833 if (vol->password == NULL) {
1834 pr_warn("CIFS: no memory for password\n");
1835 goto cifs_parse_mount_err;
1838 for (i = 0, j = 0; i < temp_len; i++, j++) {
1839 vol->password[j] = value[i];
1840 if ((value[i] == delim) &&
1841 value[i+1] == delim)
1842 /* skip the second deliminator */
1845 vol->password[j] = '\0';
1848 /* FIXME: should this be an error instead? */
1852 string = match_strdup(args);
1856 if (!cifs_convert_address(dstaddr, string,
1858 pr_err("CIFS: bad ip= option (%s).\n", string);
1859 goto cifs_parse_mount_err;
1864 string = match_strdup(args);
1868 if (strnlen(string, CIFS_MAX_DOMAINNAME_LEN)
1869 == CIFS_MAX_DOMAINNAME_LEN) {
1870 pr_warn("CIFS: domain name too long\n");
1871 goto cifs_parse_mount_err;
1874 kfree(vol->domainname);
1875 vol->domainname = kstrdup(string, GFP_KERNEL);
1876 if (!vol->domainname) {
1877 pr_warn("CIFS: no memory for domainname\n");
1878 goto cifs_parse_mount_err;
1880 cifs_dbg(FYI, "Domain name set\n");
1883 string = match_strdup(args);
1887 if (!cifs_convert_address(
1888 (struct sockaddr *)&vol->srcaddr,
1889 string, strlen(string))) {
1890 pr_warn("CIFS: Could not parse srcaddr: %s\n",
1892 goto cifs_parse_mount_err;
1896 string = match_strdup(args);
1900 if (strnlen(string, 1024) >= 65) {
1901 pr_warn("CIFS: iocharset name too long.\n");
1902 goto cifs_parse_mount_err;
1905 if (strncasecmp(string, "default", 7) != 0) {
1906 kfree(vol->iocharset);
1907 vol->iocharset = kstrdup(string,
1909 if (!vol->iocharset) {
1910 pr_warn("CIFS: no memory for charset\n");
1911 goto cifs_parse_mount_err;
1914 /* if iocharset not set then load_nls_default
1917 cifs_dbg(FYI, "iocharset set to %s\n", string);
1919 case Opt_netbiosname:
1920 string = match_strdup(args);
1924 memset(vol->source_rfc1001_name, 0x20,
1927 * FIXME: are there cases in which a comma can
1928 * be valid in workstation netbios name (and
1929 * need special handling)?
1931 for (i = 0; i < RFC1001_NAME_LEN; i++) {
1932 /* don't ucase netbiosname for user */
1935 vol->source_rfc1001_name[i] = string[i];
1937 /* The string has 16th byte zero still from
1938 * set at top of the function
1940 if (i == RFC1001_NAME_LEN && string[i] != 0)
1941 pr_warn("CIFS: netbiosname longer than 15 truncated.\n");
1944 /* servernetbiosname specified override *SMBSERVER */
1945 string = match_strdup(args);
1949 /* last byte, type, is 0x20 for servr type */
1950 memset(vol->target_rfc1001_name, 0x20,
1951 RFC1001_NAME_LEN_WITH_NULL);
1953 /* BB are there cases in which a comma can be
1954 valid in this workstation netbios name
1955 (and need special handling)? */
1957 /* user or mount helper must uppercase the
1959 for (i = 0; i < 15; i++) {
1962 vol->target_rfc1001_name[i] = string[i];
1964 /* The string has 16th byte zero still from
1965 set at top of the function */
1966 if (i == RFC1001_NAME_LEN && string[i] != 0)
1967 pr_warn("CIFS: server netbiosname longer than 15 truncated.\n");
1970 /* version of mount userspace tools, not dialect */
1971 string = match_strdup(args);
1975 /* If interface changes in mount.cifs bump to new ver */
1976 if (strncasecmp(string, "1", 1) == 0) {
1977 if (strlen(string) > 1) {
1978 pr_warn("Bad mount helper ver=%s. Did "
1979 "you want SMB1 (CIFS) dialect "
1980 "and mean to type vers=1.0 "
1981 "instead?\n", string);
1982 goto cifs_parse_mount_err;
1984 /* This is the default */
1987 /* For all other value, error */
1988 pr_warn("CIFS: Invalid mount helper version specified\n");
1989 goto cifs_parse_mount_err;
1991 /* protocol version (dialect) */
1992 string = match_strdup(args);
1996 if (cifs_parse_smb_version(string, vol, is_smb3) != 0)
1997 goto cifs_parse_mount_err;
2001 string = match_strdup(args);
2005 if (cifs_parse_security_flavors(string, vol) != 0)
2006 goto cifs_parse_mount_err;
2009 string = match_strdup(args);
2013 if (cifs_parse_cache_flavor(string, vol) != 0)
2014 goto cifs_parse_mount_err;
2018 * An option we don't recognize. Save it off for later
2019 * if we haven't already found one
2025 /* Free up any allocated string */
2030 if (!sloppy && invalid) {
2031 pr_err("CIFS: Unknown mount option \"%s\"\n", invalid);
2032 goto cifs_parse_mount_err;
2035 if (vol->rdma && vol->vals->protocol_id < SMB30_PROT_ID) {
2036 cifs_dbg(VFS, "SMB Direct requires Version >=3.0\n");
2037 goto cifs_parse_mount_err;
2041 /* Muliuser mounts require CONFIG_KEYS support */
2042 if (vol->multiuser) {
2043 cifs_dbg(VFS, "Multiuser mounts require kernels with CONFIG_KEYS enabled\n");
2044 goto cifs_parse_mount_err;
2048 cifs_dbg(VFS, "CIFS mount error: No usable UNC path provided in device string!\n");
2049 goto cifs_parse_mount_err;
2052 /* make sure UNC has a share name */
2053 if (!strchr(vol->UNC + 3, '\\')) {
2054 cifs_dbg(VFS, "Malformed UNC. Unable to find share name.\n");
2055 goto cifs_parse_mount_err;
2062 /* No ip= option specified? Try to get it from UNC */
2063 /* Use the address part of the UNC. */
2064 slash = strchr(&vol->UNC[2], '\\');
2065 len = slash - &vol->UNC[2];
2066 if (!cifs_convert_address(dstaddr, &vol->UNC[2], len)) {
2067 pr_err("Unable to determine destination address.\n");
2068 goto cifs_parse_mount_err;
2072 /* set the port that we got earlier */
2073 cifs_set_port(dstaddr, port);
2076 vol->override_uid = override_uid;
2077 else if (override_uid == 1)
2078 pr_notice("CIFS: ignoring forceuid mount option specified with no uid= option.\n");
2081 vol->override_gid = override_gid;
2082 else if (override_gid == 1)
2083 pr_notice("CIFS: ignoring forcegid mount option specified with no gid= option.\n");
2085 if (got_version == false)
2086 pr_warn("No dialect specified on mount. Default has changed to "
2087 "a more secure dialect, SMB2.1 or later (e.g. SMB3), from CIFS "
2088 "(SMB1). To use the less secure SMB1 dialect to access "
2089 "old servers which do not support SMB3 (or SMB2.1) specify vers=1.0"
2092 kfree(mountdata_copy);
2096 pr_warn("Could not allocate temporary buffer\n");
2097 cifs_parse_mount_err:
2099 kfree(mountdata_copy);
2103 /** Returns true if srcaddr isn't specified and rhs isn't
2104 * specified, or if srcaddr is specified and
2105 * matches the IP address of the rhs argument.
2108 srcip_matches(struct sockaddr *srcaddr, struct sockaddr *rhs)
2110 switch (srcaddr->sa_family) {
2112 return (rhs->sa_family == AF_UNSPEC);
2114 struct sockaddr_in *saddr4 = (struct sockaddr_in *)srcaddr;
2115 struct sockaddr_in *vaddr4 = (struct sockaddr_in *)rhs;
2116 return (saddr4->sin_addr.s_addr == vaddr4->sin_addr.s_addr);
2119 struct sockaddr_in6 *saddr6 = (struct sockaddr_in6 *)srcaddr;
2120 struct sockaddr_in6 *vaddr6 = (struct sockaddr_in6 *)rhs;
2121 return ipv6_addr_equal(&saddr6->sin6_addr, &vaddr6->sin6_addr);
2125 return false; /* don't expect to be here */
2130 * If no port is specified in addr structure, we try to match with 445 port
2131 * and if it fails - with 139 ports. It should be called only if address
2132 * families of server and addr are equal.
2135 match_port(struct TCP_Server_Info *server, struct sockaddr *addr)
2137 __be16 port, *sport;
2139 switch (addr->sa_family) {
2141 sport = &((struct sockaddr_in *) &server->dstaddr)->sin_port;
2142 port = ((struct sockaddr_in *) addr)->sin_port;
2145 sport = &((struct sockaddr_in6 *) &server->dstaddr)->sin6_port;
2146 port = ((struct sockaddr_in6 *) addr)->sin6_port;
2154 port = htons(CIFS_PORT);
2158 port = htons(RFC1001_PORT);
2161 return port == *sport;
2165 match_address(struct TCP_Server_Info *server, struct sockaddr *addr,
2166 struct sockaddr *srcaddr)
2168 switch (addr->sa_family) {
2170 struct sockaddr_in *addr4 = (struct sockaddr_in *)addr;
2171 struct sockaddr_in *srv_addr4 =
2172 (struct sockaddr_in *)&server->dstaddr;
2174 if (addr4->sin_addr.s_addr != srv_addr4->sin_addr.s_addr)
2179 struct sockaddr_in6 *addr6 = (struct sockaddr_in6 *)addr;
2180 struct sockaddr_in6 *srv_addr6 =
2181 (struct sockaddr_in6 *)&server->dstaddr;
2183 if (!ipv6_addr_equal(&addr6->sin6_addr,
2184 &srv_addr6->sin6_addr))
2186 if (addr6->sin6_scope_id != srv_addr6->sin6_scope_id)
2192 return false; /* don't expect to be here */
2195 if (!srcip_matches(srcaddr, (struct sockaddr *)&server->srcaddr))
2202 match_security(struct TCP_Server_Info *server, struct smb_vol *vol)
2205 * The select_sectype function should either return the vol->sectype
2206 * that was specified, or "Unspecified" if that sectype was not
2207 * compatible with the given NEGOTIATE request.
2209 if (server->ops->select_sectype(server, vol->sectype)
2214 * Now check if signing mode is acceptable. No need to check
2215 * global_secflags at this point since if MUST_SIGN is set then
2216 * the server->sign had better be too.
2218 if (vol->sign && !server->sign)
2224 static int match_server(struct TCP_Server_Info *server, struct smb_vol *vol)
2226 struct sockaddr *addr = (struct sockaddr *)&vol->dstaddr;
2228 if (vol->nosharesock)
2231 /* BB update this for smb3any and default case */
2232 if ((server->vals != vol->vals) || (server->ops != vol->ops))
2235 if (!net_eq(cifs_net_ns(server), current->nsproxy->net_ns))
2238 if (!match_address(server, addr,
2239 (struct sockaddr *)&vol->srcaddr))
2242 if (!match_port(server, addr))
2245 if (!match_security(server, vol))
2248 if (server->echo_interval != vol->echo_interval * HZ)
2251 if (server->rdma != vol->rdma)
2257 static struct TCP_Server_Info *
2258 cifs_find_tcp_session(struct smb_vol *vol)
2260 struct TCP_Server_Info *server;
2262 spin_lock(&cifs_tcp_ses_lock);
2263 list_for_each_entry(server, &cifs_tcp_ses_list, tcp_ses_list) {
2264 if (!match_server(server, vol))
2267 ++server->srv_count;
2268 spin_unlock(&cifs_tcp_ses_lock);
2269 cifs_dbg(FYI, "Existing tcp session with server found\n");
2272 spin_unlock(&cifs_tcp_ses_lock);
2277 cifs_put_tcp_session(struct TCP_Server_Info *server, int from_reconnect)
2279 struct task_struct *task;
2281 spin_lock(&cifs_tcp_ses_lock);
2282 if (--server->srv_count > 0) {
2283 spin_unlock(&cifs_tcp_ses_lock);
2287 put_net(cifs_net_ns(server));
2289 list_del_init(&server->tcp_ses_list);
2290 spin_unlock(&cifs_tcp_ses_lock);
2292 cancel_delayed_work_sync(&server->echo);
2296 * Avoid deadlock here: reconnect work calls
2297 * cifs_put_tcp_session() at its end. Need to be sure
2298 * that reconnect work does nothing with server pointer after
2301 cancel_delayed_work(&server->reconnect);
2303 cancel_delayed_work_sync(&server->reconnect);
2305 spin_lock(&GlobalMid_Lock);
2306 server->tcpStatus = CifsExiting;
2307 spin_unlock(&GlobalMid_Lock);
2309 cifs_crypto_secmech_release(server);
2310 cifs_fscache_release_client_cookie(server);
2312 kfree(server->session_key.response);
2313 server->session_key.response = NULL;
2314 server->session_key.len = 0;
2316 task = xchg(&server->tsk, NULL);
2318 force_sig(SIGKILL, task);
2321 static struct TCP_Server_Info *
2322 cifs_get_tcp_session(struct smb_vol *volume_info)
2324 struct TCP_Server_Info *tcp_ses = NULL;
2327 cifs_dbg(FYI, "UNC: %s\n", volume_info->UNC);
2329 /* see if we already have a matching tcp_ses */
2330 tcp_ses = cifs_find_tcp_session(volume_info);
2334 tcp_ses = kzalloc(sizeof(struct TCP_Server_Info), GFP_KERNEL);
2340 tcp_ses->ops = volume_info->ops;
2341 tcp_ses->vals = volume_info->vals;
2342 cifs_set_net_ns(tcp_ses, get_net(current->nsproxy->net_ns));
2343 tcp_ses->hostname = extract_hostname(volume_info->UNC);
2344 if (IS_ERR(tcp_ses->hostname)) {
2345 rc = PTR_ERR(tcp_ses->hostname);
2346 goto out_err_crypto_release;
2349 tcp_ses->noblocksnd = volume_info->noblocksnd;
2350 tcp_ses->noautotune = volume_info->noautotune;
2351 tcp_ses->tcp_nodelay = volume_info->sockopt_tcp_nodelay;
2352 tcp_ses->rdma = volume_info->rdma;
2353 tcp_ses->in_flight = 0;
2354 tcp_ses->credits = 1;
2355 init_waitqueue_head(&tcp_ses->response_q);
2356 init_waitqueue_head(&tcp_ses->request_q);
2357 INIT_LIST_HEAD(&tcp_ses->pending_mid_q);
2358 mutex_init(&tcp_ses->srv_mutex);
2359 memcpy(tcp_ses->workstation_RFC1001_name,
2360 volume_info->source_rfc1001_name, RFC1001_NAME_LEN_WITH_NULL);
2361 memcpy(tcp_ses->server_RFC1001_name,
2362 volume_info->target_rfc1001_name, RFC1001_NAME_LEN_WITH_NULL);
2363 tcp_ses->session_estab = false;
2364 tcp_ses->sequence_number = 0;
2365 tcp_ses->lstrp = jiffies;
2366 spin_lock_init(&tcp_ses->req_lock);
2367 INIT_LIST_HEAD(&tcp_ses->tcp_ses_list);
2368 INIT_LIST_HEAD(&tcp_ses->smb_ses_list);
2369 INIT_DELAYED_WORK(&tcp_ses->echo, cifs_echo_request);
2370 INIT_DELAYED_WORK(&tcp_ses->reconnect, smb2_reconnect_server);
2371 mutex_init(&tcp_ses->reconnect_mutex);
2372 memcpy(&tcp_ses->srcaddr, &volume_info->srcaddr,
2373 sizeof(tcp_ses->srcaddr));
2374 memcpy(&tcp_ses->dstaddr, &volume_info->dstaddr,
2375 sizeof(tcp_ses->dstaddr));
2376 generate_random_uuid(tcp_ses->client_guid);
2378 * at this point we are the only ones with the pointer
2379 * to the struct since the kernel thread not created yet
2380 * no need to spinlock this init of tcpStatus or srv_count
2382 tcp_ses->tcpStatus = CifsNew;
2383 ++tcp_ses->srv_count;
2385 if (volume_info->echo_interval >= SMB_ECHO_INTERVAL_MIN &&
2386 volume_info->echo_interval <= SMB_ECHO_INTERVAL_MAX)
2387 tcp_ses->echo_interval = volume_info->echo_interval * HZ;
2389 tcp_ses->echo_interval = SMB_ECHO_INTERVAL_DEFAULT * HZ;
2390 if (tcp_ses->rdma) {
2391 #ifndef CONFIG_CIFS_SMB_DIRECT
2392 cifs_dbg(VFS, "CONFIG_CIFS_SMB_DIRECT is not enabled\n");
2394 goto out_err_crypto_release;
2396 tcp_ses->smbd_conn = smbd_get_connection(
2397 tcp_ses, (struct sockaddr *)&volume_info->dstaddr);
2398 if (tcp_ses->smbd_conn) {
2399 cifs_dbg(VFS, "RDMA transport established\n");
2401 goto smbd_connected;
2404 goto out_err_crypto_release;
2407 rc = ip_connect(tcp_ses);
2409 cifs_dbg(VFS, "Error connecting to socket. Aborting operation.\n");
2410 goto out_err_crypto_release;
2414 * since we're in a cifs function already, we know that
2415 * this will succeed. No need for try_module_get().
2417 __module_get(THIS_MODULE);
2418 tcp_ses->tsk = kthread_run(cifs_demultiplex_thread,
2420 if (IS_ERR(tcp_ses->tsk)) {
2421 rc = PTR_ERR(tcp_ses->tsk);
2422 cifs_dbg(VFS, "error %d create cifsd thread\n", rc);
2423 module_put(THIS_MODULE);
2424 goto out_err_crypto_release;
2426 tcp_ses->tcpStatus = CifsNeedNegotiate;
2428 /* thread spawned, put it on the list */
2429 spin_lock(&cifs_tcp_ses_lock);
2430 list_add(&tcp_ses->tcp_ses_list, &cifs_tcp_ses_list);
2431 spin_unlock(&cifs_tcp_ses_lock);
2433 cifs_fscache_get_client_cookie(tcp_ses);
2435 /* queue echo request delayed work */
2436 queue_delayed_work(cifsiod_wq, &tcp_ses->echo, tcp_ses->echo_interval);
2440 out_err_crypto_release:
2441 cifs_crypto_secmech_release(tcp_ses);
2443 put_net(cifs_net_ns(tcp_ses));
2447 if (!IS_ERR(tcp_ses->hostname))
2448 kfree(tcp_ses->hostname);
2449 if (tcp_ses->ssocket)
2450 sock_release(tcp_ses->ssocket);
2456 static int match_session(struct cifs_ses *ses, struct smb_vol *vol)
2458 if (vol->sectype != Unspecified &&
2459 vol->sectype != ses->sectype)
2462 switch (ses->sectype) {
2464 if (!uid_eq(vol->cred_uid, ses->cred_uid))
2468 /* NULL username means anonymous session */
2469 if (ses->user_name == NULL) {
2475 /* anything else takes username/password */
2476 if (strncmp(ses->user_name,
2477 vol->username ? vol->username : "",
2478 CIFS_MAX_USERNAME_LEN))
2480 if ((vol->username && strlen(vol->username) != 0) &&
2481 ses->password != NULL &&
2482 strncmp(ses->password,
2483 vol->password ? vol->password : "",
2484 CIFS_MAX_PASSWORD_LEN))
2491 * cifs_setup_ipc - helper to setup the IPC tcon for the session
2493 * A new IPC connection is made and stored in the session
2494 * tcon_ipc. The IPC tcon has the same lifetime as the session.
2497 cifs_setup_ipc(struct cifs_ses *ses, struct smb_vol *volume_info)
2500 struct cifs_tcon *tcon;
2501 struct nls_table *nls_codepage;
2502 char unc[SERVER_NAME_LENGTH + sizeof("//x/IPC$")] = {0};
2506 * If the mount request that resulted in the creation of the
2507 * session requires encryption, force IPC to be encrypted too.
2509 if (volume_info->seal) {
2510 if (ses->server->capabilities & SMB2_GLOBAL_CAP_ENCRYPTION)
2514 "IPC: server doesn't support encryption\n");
2519 tcon = tconInfoAlloc();
2523 snprintf(unc, sizeof(unc), "\\\\%s\\IPC$", ses->serverName);
2526 nls_codepage = load_nls_default();
2532 rc = ses->server->ops->tree_connect(xid, ses, unc, tcon, nls_codepage);
2536 cifs_dbg(VFS, "failed to connect to IPC (rc=%d)\n", rc);
2541 cifs_dbg(FYI, "IPC tcon rc = %d ipc tid = %d\n", rc, tcon->tid);
2543 ses->tcon_ipc = tcon;
2545 unload_nls(nls_codepage);
2550 * cifs_free_ipc - helper to release the session IPC tcon
2552 * Needs to be called everytime a session is destroyed
2555 cifs_free_ipc(struct cifs_ses *ses)
2558 struct cifs_tcon *tcon = ses->tcon_ipc;
2563 if (ses->server->ops->tree_disconnect) {
2565 rc = ses->server->ops->tree_disconnect(xid, tcon);
2570 cifs_dbg(FYI, "failed to disconnect IPC tcon (rc=%d)\n", rc);
2573 ses->tcon_ipc = NULL;
2577 static struct cifs_ses *
2578 cifs_find_smb_ses(struct TCP_Server_Info *server, struct smb_vol *vol)
2580 struct cifs_ses *ses;
2582 spin_lock(&cifs_tcp_ses_lock);
2583 list_for_each_entry(ses, &server->smb_ses_list, smb_ses_list) {
2584 if (ses->status == CifsExiting)
2586 if (!match_session(ses, vol))
2589 spin_unlock(&cifs_tcp_ses_lock);
2592 spin_unlock(&cifs_tcp_ses_lock);
2597 cifs_put_smb_ses(struct cifs_ses *ses)
2599 unsigned int rc, xid;
2600 struct TCP_Server_Info *server = ses->server;
2602 cifs_dbg(FYI, "%s: ses_count=%d\n", __func__, ses->ses_count);
2604 spin_lock(&cifs_tcp_ses_lock);
2605 if (ses->status == CifsExiting) {
2606 spin_unlock(&cifs_tcp_ses_lock);
2609 if (--ses->ses_count > 0) {
2610 spin_unlock(&cifs_tcp_ses_lock);
2613 if (ses->status == CifsGood)
2614 ses->status = CifsExiting;
2615 spin_unlock(&cifs_tcp_ses_lock);
2619 if (ses->status == CifsExiting && server->ops->logoff) {
2621 rc = server->ops->logoff(xid, ses);
2623 cifs_dbg(VFS, "%s: Session Logoff failure rc=%d\n",
2628 spin_lock(&cifs_tcp_ses_lock);
2629 list_del_init(&ses->smb_ses_list);
2630 spin_unlock(&cifs_tcp_ses_lock);
2633 cifs_put_tcp_session(server, 0);
2638 /* strlen("cifs:a:") + CIFS_MAX_DOMAINNAME_LEN + 1 */
2639 #define CIFSCREDS_DESC_SIZE (7 + CIFS_MAX_DOMAINNAME_LEN + 1)
2641 /* Populate username and pw fields from keyring if possible */
2643 cifs_set_cifscreds(struct smb_vol *vol, struct cifs_ses *ses)
2646 const char *delim, *payload;
2650 struct TCP_Server_Info *server = ses->server;
2651 struct sockaddr_in *sa;
2652 struct sockaddr_in6 *sa6;
2653 const struct user_key_payload *upayload;
2655 desc = kmalloc(CIFSCREDS_DESC_SIZE, GFP_KERNEL);
2659 /* try to find an address key first */
2660 switch (server->dstaddr.ss_family) {
2662 sa = (struct sockaddr_in *)&server->dstaddr;
2663 sprintf(desc, "cifs:a:%pI4", &sa->sin_addr.s_addr);
2666 sa6 = (struct sockaddr_in6 *)&server->dstaddr;
2667 sprintf(desc, "cifs:a:%pI6c", &sa6->sin6_addr.s6_addr);
2670 cifs_dbg(FYI, "Bad ss_family (%hu)\n",
2671 server->dstaddr.ss_family);
2676 cifs_dbg(FYI, "%s: desc=%s\n", __func__, desc);
2677 key = request_key(&key_type_logon, desc, "");
2679 if (!ses->domainName) {
2680 cifs_dbg(FYI, "domainName is NULL\n");
2685 /* didn't work, try to find a domain key */
2686 sprintf(desc, "cifs:d:%s", ses->domainName);
2687 cifs_dbg(FYI, "%s: desc=%s\n", __func__, desc);
2688 key = request_key(&key_type_logon, desc, "");
2695 down_read(&key->sem);
2696 upayload = user_key_payload_locked(key);
2697 if (IS_ERR_OR_NULL(upayload)) {
2698 rc = upayload ? PTR_ERR(upayload) : -EINVAL;
2702 /* find first : in payload */
2703 payload = upayload->data;
2704 delim = strnchr(payload, upayload->datalen, ':');
2705 cifs_dbg(FYI, "payload=%s\n", payload);
2707 cifs_dbg(FYI, "Unable to find ':' in payload (datalen=%d)\n",
2713 len = delim - payload;
2714 if (len > CIFS_MAX_USERNAME_LEN || len <= 0) {
2715 cifs_dbg(FYI, "Bad value from username search (len=%zd)\n",
2721 vol->username = kstrndup(payload, len, GFP_KERNEL);
2722 if (!vol->username) {
2723 cifs_dbg(FYI, "Unable to allocate %zd bytes for username\n",
2728 cifs_dbg(FYI, "%s: username=%s\n", __func__, vol->username);
2730 len = key->datalen - (len + 1);
2731 if (len > CIFS_MAX_PASSWORD_LEN || len <= 0) {
2732 cifs_dbg(FYI, "Bad len for password search (len=%zd)\n", len);
2734 kfree(vol->username);
2735 vol->username = NULL;
2740 vol->password = kstrndup(delim, len, GFP_KERNEL);
2741 if (!vol->password) {
2742 cifs_dbg(FYI, "Unable to allocate %zd bytes for password\n",
2745 kfree(vol->username);
2746 vol->username = NULL;
2755 cifs_dbg(FYI, "%s: returning %d\n", __func__, rc);
2758 #else /* ! CONFIG_KEYS */
2760 cifs_set_cifscreds(struct smb_vol *vol __attribute__((unused)),
2761 struct cifs_ses *ses __attribute__((unused)))
2765 #endif /* CONFIG_KEYS */
2768 * cifs_get_smb_ses - get a session matching @volume_info data from @server
2770 * This function assumes it is being called from cifs_mount() where we
2771 * already got a server reference (server refcount +1). See
2772 * cifs_get_tcon() for refcount explanations.
2774 static struct cifs_ses *
2775 cifs_get_smb_ses(struct TCP_Server_Info *server, struct smb_vol *volume_info)
2779 struct cifs_ses *ses;
2780 struct sockaddr_in *addr = (struct sockaddr_in *)&server->dstaddr;
2781 struct sockaddr_in6 *addr6 = (struct sockaddr_in6 *)&server->dstaddr;
2785 ses = cifs_find_smb_ses(server, volume_info);
2787 cifs_dbg(FYI, "Existing smb sess found (status=%d)\n",
2790 mutex_lock(&ses->session_mutex);
2791 rc = cifs_negotiate_protocol(xid, ses);
2793 mutex_unlock(&ses->session_mutex);
2794 /* problem -- put our ses reference */
2795 cifs_put_smb_ses(ses);
2799 if (ses->need_reconnect) {
2800 cifs_dbg(FYI, "Session needs reconnect\n");
2801 rc = cifs_setup_session(xid, ses,
2802 volume_info->local_nls);
2804 mutex_unlock(&ses->session_mutex);
2805 /* problem -- put our reference */
2806 cifs_put_smb_ses(ses);
2811 mutex_unlock(&ses->session_mutex);
2813 /* existing SMB ses has a server reference already */
2814 cifs_put_tcp_session(server, 0);
2819 cifs_dbg(FYI, "Existing smb sess not found\n");
2820 ses = sesInfoAlloc();
2824 /* new SMB session uses our server ref */
2825 ses->server = server;
2826 if (server->dstaddr.ss_family == AF_INET6)
2827 sprintf(ses->serverName, "%pI6", &addr6->sin6_addr);
2829 sprintf(ses->serverName, "%pI4", &addr->sin_addr);
2831 if (volume_info->username) {
2832 ses->user_name = kstrdup(volume_info->username, GFP_KERNEL);
2833 if (!ses->user_name)
2837 /* volume_info->password freed at unmount */
2838 if (volume_info->password) {
2839 ses->password = kstrdup(volume_info->password, GFP_KERNEL);
2843 if (volume_info->domainname) {
2844 ses->domainName = kstrdup(volume_info->domainname, GFP_KERNEL);
2845 if (!ses->domainName)
2848 if (volume_info->domainauto)
2849 ses->domainAuto = volume_info->domainauto;
2850 ses->cred_uid = volume_info->cred_uid;
2851 ses->linux_uid = volume_info->linux_uid;
2853 ses->sectype = volume_info->sectype;
2854 ses->sign = volume_info->sign;
2856 mutex_lock(&ses->session_mutex);
2857 rc = cifs_negotiate_protocol(xid, ses);
2859 rc = cifs_setup_session(xid, ses, volume_info->local_nls);
2860 mutex_unlock(&ses->session_mutex);
2864 /* success, put it on the list */
2865 spin_lock(&cifs_tcp_ses_lock);
2866 list_add(&ses->smb_ses_list, &server->smb_ses_list);
2867 spin_unlock(&cifs_tcp_ses_lock);
2871 cifs_setup_ipc(ses, volume_info);
2881 static int match_tcon(struct cifs_tcon *tcon, struct smb_vol *volume_info)
2883 if (tcon->tidStatus == CifsExiting)
2885 if (strncmp(tcon->treeName, volume_info->UNC, MAX_TREE_SIZE))
2887 if (tcon->seal != volume_info->seal)
2889 if (tcon->snapshot_time != volume_info->snapshot_time)
2894 static struct cifs_tcon *
2895 cifs_find_tcon(struct cifs_ses *ses, struct smb_vol *volume_info)
2897 struct list_head *tmp;
2898 struct cifs_tcon *tcon;
2900 spin_lock(&cifs_tcp_ses_lock);
2901 list_for_each(tmp, &ses->tcon_list) {
2902 tcon = list_entry(tmp, struct cifs_tcon, tcon_list);
2903 if (!match_tcon(tcon, volume_info))
2906 spin_unlock(&cifs_tcp_ses_lock);
2909 spin_unlock(&cifs_tcp_ses_lock);
2914 cifs_put_tcon(struct cifs_tcon *tcon)
2917 struct cifs_ses *ses;
2920 * IPC tcon share the lifetime of their session and are
2921 * destroyed in the session put function
2923 if (tcon == NULL || tcon->ipc)
2927 cifs_dbg(FYI, "%s: tc_count=%d\n", __func__, tcon->tc_count);
2928 spin_lock(&cifs_tcp_ses_lock);
2929 if (--tcon->tc_count > 0) {
2930 spin_unlock(&cifs_tcp_ses_lock);
2934 list_del_init(&tcon->tcon_list);
2935 spin_unlock(&cifs_tcp_ses_lock);
2938 if (ses->server->ops->tree_disconnect)
2939 ses->server->ops->tree_disconnect(xid, tcon);
2942 cifs_fscache_release_super_cookie(tcon);
2944 cifs_put_smb_ses(ses);
2948 * cifs_get_tcon - get a tcon matching @volume_info data from @ses
2950 * - tcon refcount is the number of mount points using the tcon.
2951 * - ses refcount is the number of tcon using the session.
2953 * 1. This function assumes it is being called from cifs_mount() where
2954 * we already got a session reference (ses refcount +1).
2956 * 2. Since we're in the context of adding a mount point, the end
2957 * result should be either:
2959 * a) a new tcon already allocated with refcount=1 (1 mount point) and
2960 * its session refcount incremented (1 new tcon). This +1 was
2961 * already done in (1).
2963 * b) an existing tcon with refcount+1 (add a mount point to it) and
2964 * identical ses refcount (no new tcon). Because of (1) we need to
2965 * decrement the ses refcount.
2967 static struct cifs_tcon *
2968 cifs_get_tcon(struct cifs_ses *ses, struct smb_vol *volume_info)
2971 struct cifs_tcon *tcon;
2973 tcon = cifs_find_tcon(ses, volume_info);
2976 * tcon has refcount already incremented but we need to
2977 * decrement extra ses reference gotten by caller (case b)
2979 cifs_dbg(FYI, "Found match on UNC path\n");
2980 cifs_put_smb_ses(ses);
2984 if (!ses->server->ops->tree_connect) {
2989 tcon = tconInfoAlloc();
2995 if (volume_info->snapshot_time) {
2996 if (ses->server->vals->protocol_id == 0) {
2998 "Use SMB2 or later for snapshot mount option\n");
3002 tcon->snapshot_time = volume_info->snapshot_time;
3006 if (volume_info->password) {
3007 tcon->password = kstrdup(volume_info->password, GFP_KERNEL);
3008 if (!tcon->password) {
3014 if (volume_info->seal) {
3015 if (ses->server->vals->protocol_id == 0) {
3017 "SMB3 or later required for encryption\n");
3020 } else if (tcon->ses->server->capabilities &
3021 SMB2_GLOBAL_CAP_ENCRYPTION)
3024 cifs_dbg(VFS, "Encryption is not supported on share\n");
3030 #ifdef CONFIG_CIFS_SMB311
3031 if ((volume_info->linux_ext) && (ses->server->posix_ext_supported)) {
3032 if (ses->server->vals->protocol_id == SMB311_PROT_ID)
3033 tcon->posix_extensions = true;
3038 * BB Do we need to wrap session_mutex around this TCon call and Unix
3039 * SetFS as we do on SessSetup and reconnect?
3042 rc = ses->server->ops->tree_connect(xid, ses, volume_info->UNC, tcon,
3043 volume_info->local_nls);
3045 cifs_dbg(FYI, "Tcon rc = %d\n", rc);
3049 if (volume_info->nodfs) {
3050 tcon->Flags &= ~SMB_SHARE_IS_IN_DFS;
3051 cifs_dbg(FYI, "DFS disabled (%d)\n", tcon->Flags);
3053 tcon->use_persistent = false;
3054 /* check if SMB2 or later, CIFS does not support persistent handles */
3055 if (volume_info->persistent) {
3056 if (ses->server->vals->protocol_id == 0) {
3058 "SMB3 or later required for persistent handles\n");
3061 } else if (ses->server->capabilities &
3062 SMB2_GLOBAL_CAP_PERSISTENT_HANDLES)
3063 tcon->use_persistent = true;
3064 else /* persistent handles requested but not supported */ {
3066 "Persistent handles not supported on share\n");
3070 } else if ((tcon->capabilities & SMB2_SHARE_CAP_CONTINUOUS_AVAILABILITY)
3071 && (ses->server->capabilities & SMB2_GLOBAL_CAP_PERSISTENT_HANDLES)
3072 && (volume_info->nopersistent == false)) {
3073 cifs_dbg(FYI, "enabling persistent handles\n");
3074 tcon->use_persistent = true;
3075 } else if (volume_info->resilient) {
3076 if (ses->server->vals->protocol_id == 0) {
3078 "SMB2.1 or later required for resilient handles\n");
3082 tcon->use_resilient = true;
3086 * We can have only one retry value for a connection to a share so for
3087 * resources mounted more than once to the same server share the last
3088 * value passed in for the retry flag is used.
3090 tcon->retry = volume_info->retry;
3091 tcon->nocase = volume_info->nocase;
3092 tcon->nohandlecache = volume_info->nohandlecache;
3093 tcon->local_lease = volume_info->local_lease;
3094 INIT_LIST_HEAD(&tcon->pending_opens);
3096 spin_lock(&cifs_tcp_ses_lock);
3097 list_add(&tcon->tcon_list, &ses->tcon_list);
3098 spin_unlock(&cifs_tcp_ses_lock);
3100 cifs_fscache_get_super_cookie(tcon);
3110 cifs_put_tlink(struct tcon_link *tlink)
3112 if (!tlink || IS_ERR(tlink))
3115 if (!atomic_dec_and_test(&tlink->tl_count) ||
3116 test_bit(TCON_LINK_IN_TREE, &tlink->tl_flags)) {
3117 tlink->tl_time = jiffies;
3121 if (!IS_ERR(tlink_tcon(tlink)))
3122 cifs_put_tcon(tlink_tcon(tlink));
3128 compare_mount_options(struct super_block *sb, struct cifs_mnt_data *mnt_data)
3130 struct cifs_sb_info *old = CIFS_SB(sb);
3131 struct cifs_sb_info *new = mnt_data->cifs_sb;
3133 if ((sb->s_flags & CIFS_MS_MASK) != (mnt_data->flags & CIFS_MS_MASK))
3136 if ((old->mnt_cifs_flags & CIFS_MOUNT_MASK) !=
3137 (new->mnt_cifs_flags & CIFS_MOUNT_MASK))
3141 * We want to share sb only if we don't specify an r/wsize or
3142 * specified r/wsize is greater than or equal to existing one.
3144 if (new->wsize && new->wsize < old->wsize)
3147 if (new->rsize && new->rsize < old->rsize)
3150 if (!uid_eq(old->mnt_uid, new->mnt_uid) || !gid_eq(old->mnt_gid, new->mnt_gid))
3153 if (old->mnt_file_mode != new->mnt_file_mode ||
3154 old->mnt_dir_mode != new->mnt_dir_mode)
3157 if (strcmp(old->local_nls->charset, new->local_nls->charset))
3160 if (old->actimeo != new->actimeo)
3167 match_prepath(struct super_block *sb, struct cifs_mnt_data *mnt_data)
3169 struct cifs_sb_info *old = CIFS_SB(sb);
3170 struct cifs_sb_info *new = mnt_data->cifs_sb;
3171 bool old_set = old->mnt_cifs_flags & CIFS_MOUNT_USE_PREFIX_PATH;
3172 bool new_set = new->mnt_cifs_flags & CIFS_MOUNT_USE_PREFIX_PATH;
3174 if (old_set && new_set && !strcmp(new->prepath, old->prepath))
3176 else if (!old_set && !new_set)
3183 cifs_match_super(struct super_block *sb, void *data)
3185 struct cifs_mnt_data *mnt_data = (struct cifs_mnt_data *)data;
3186 struct smb_vol *volume_info;
3187 struct cifs_sb_info *cifs_sb;
3188 struct TCP_Server_Info *tcp_srv;
3189 struct cifs_ses *ses;
3190 struct cifs_tcon *tcon;
3191 struct tcon_link *tlink;
3194 spin_lock(&cifs_tcp_ses_lock);
3195 cifs_sb = CIFS_SB(sb);
3196 tlink = cifs_get_tlink(cifs_sb_master_tlink(cifs_sb));
3197 if (IS_ERR(tlink)) {
3198 spin_unlock(&cifs_tcp_ses_lock);
3201 tcon = tlink_tcon(tlink);
3203 tcp_srv = ses->server;
3205 volume_info = mnt_data->vol;
3207 if (!match_server(tcp_srv, volume_info) ||
3208 !match_session(ses, volume_info) ||
3209 !match_tcon(tcon, volume_info) ||
3210 !match_prepath(sb, mnt_data)) {
3215 rc = compare_mount_options(sb, mnt_data);
3217 spin_unlock(&cifs_tcp_ses_lock);
3218 cifs_put_tlink(tlink);
3223 get_dfs_path(const unsigned int xid, struct cifs_ses *ses, const char *old_path,
3224 const struct nls_table *nls_codepage, unsigned int *num_referrals,
3225 struct dfs_info3_param **referrals, int remap)
3229 if (!ses->server->ops->get_dfs_refer)
3235 rc = ses->server->ops->get_dfs_refer(xid, ses, old_path,
3236 referrals, num_referrals,
3237 nls_codepage, remap);
3241 #ifdef CONFIG_DEBUG_LOCK_ALLOC
3242 static struct lock_class_key cifs_key[2];
3243 static struct lock_class_key cifs_slock_key[2];
3246 cifs_reclassify_socket4(struct socket *sock)
3248 struct sock *sk = sock->sk;
3249 BUG_ON(!sock_allow_reclassification(sk));
3250 sock_lock_init_class_and_name(sk, "slock-AF_INET-CIFS",
3251 &cifs_slock_key[0], "sk_lock-AF_INET-CIFS", &cifs_key[0]);
3255 cifs_reclassify_socket6(struct socket *sock)
3257 struct sock *sk = sock->sk;
3258 BUG_ON(!sock_allow_reclassification(sk));
3259 sock_lock_init_class_and_name(sk, "slock-AF_INET6-CIFS",
3260 &cifs_slock_key[1], "sk_lock-AF_INET6-CIFS", &cifs_key[1]);
3264 cifs_reclassify_socket4(struct socket *sock)
3269 cifs_reclassify_socket6(struct socket *sock)
3274 /* See RFC1001 section 14 on representation of Netbios names */
3275 static void rfc1002mangle(char *target, char *source, unsigned int length)
3279 for (i = 0, j = 0; i < (length); i++) {
3280 /* mask a nibble at a time and encode */
3281 target[j] = 'A' + (0x0F & (source[i] >> 4));
3282 target[j+1] = 'A' + (0x0F & source[i]);
3289 bind_socket(struct TCP_Server_Info *server)
3292 if (server->srcaddr.ss_family != AF_UNSPEC) {
3293 /* Bind to the specified local IP address */
3294 struct socket *socket = server->ssocket;
3295 rc = socket->ops->bind(socket,
3296 (struct sockaddr *) &server->srcaddr,
3297 sizeof(server->srcaddr));
3299 struct sockaddr_in *saddr4;
3300 struct sockaddr_in6 *saddr6;
3301 saddr4 = (struct sockaddr_in *)&server->srcaddr;
3302 saddr6 = (struct sockaddr_in6 *)&server->srcaddr;
3303 if (saddr6->sin6_family == AF_INET6)
3304 cifs_dbg(VFS, "Failed to bind to: %pI6c, error: %d\n",
3305 &saddr6->sin6_addr, rc);
3307 cifs_dbg(VFS, "Failed to bind to: %pI4, error: %d\n",
3308 &saddr4->sin_addr.s_addr, rc);
3315 ip_rfc1001_connect(struct TCP_Server_Info *server)
3319 * some servers require RFC1001 sessinit before sending
3320 * negprot - BB check reconnection in case where second
3321 * sessinit is sent but no second negprot
3323 struct rfc1002_session_packet *ses_init_buf;
3324 struct smb_hdr *smb_buf;
3325 ses_init_buf = kzalloc(sizeof(struct rfc1002_session_packet),
3328 ses_init_buf->trailer.session_req.called_len = 32;
3330 if (server->server_RFC1001_name[0] != 0)
3331 rfc1002mangle(ses_init_buf->trailer.
3332 session_req.called_name,
3333 server->server_RFC1001_name,
3334 RFC1001_NAME_LEN_WITH_NULL);
3336 rfc1002mangle(ses_init_buf->trailer.
3337 session_req.called_name,
3338 DEFAULT_CIFS_CALLED_NAME,
3339 RFC1001_NAME_LEN_WITH_NULL);
3341 ses_init_buf->trailer.session_req.calling_len = 32;
3344 * calling name ends in null (byte 16) from old smb
3347 if (server->workstation_RFC1001_name[0] != 0)
3348 rfc1002mangle(ses_init_buf->trailer.
3349 session_req.calling_name,
3350 server->workstation_RFC1001_name,
3351 RFC1001_NAME_LEN_WITH_NULL);
3353 rfc1002mangle(ses_init_buf->trailer.
3354 session_req.calling_name,
3356 RFC1001_NAME_LEN_WITH_NULL);
3358 ses_init_buf->trailer.session_req.scope1 = 0;
3359 ses_init_buf->trailer.session_req.scope2 = 0;
3360 smb_buf = (struct smb_hdr *)ses_init_buf;
3362 /* sizeof RFC1002_SESSION_REQUEST with no scope */
3363 smb_buf->smb_buf_length = cpu_to_be32(0x81000044);
3364 rc = smb_send(server, smb_buf, 0x44);
3365 kfree(ses_init_buf);
3367 * RFC1001 layer in at least one server
3368 * requires very short break before negprot
3369 * presumably because not expecting negprot
3370 * to follow so fast. This is a simple
3371 * solution that works without
3372 * complicating the code and causes no
3373 * significant slowing down on mount
3376 usleep_range(1000, 2000);
3379 * else the negprot may still work without this
3380 * even though malloc failed
3387 generic_ip_connect(struct TCP_Server_Info *server)
3392 struct socket *socket = server->ssocket;
3393 struct sockaddr *saddr;
3395 saddr = (struct sockaddr *) &server->dstaddr;
3397 if (server->dstaddr.ss_family == AF_INET6) {
3398 sport = ((struct sockaddr_in6 *) saddr)->sin6_port;
3399 slen = sizeof(struct sockaddr_in6);
3402 sport = ((struct sockaddr_in *) saddr)->sin_port;
3403 slen = sizeof(struct sockaddr_in);
3407 if (socket == NULL) {
3408 rc = __sock_create(cifs_net_ns(server), sfamily, SOCK_STREAM,
3409 IPPROTO_TCP, &socket, 1);
3411 cifs_dbg(VFS, "Error %d creating socket\n", rc);
3412 server->ssocket = NULL;
3416 /* BB other socket options to set KEEPALIVE, NODELAY? */
3417 cifs_dbg(FYI, "Socket created\n");
3418 server->ssocket = socket;
3419 socket->sk->sk_allocation = GFP_NOFS;
3420 if (sfamily == AF_INET6)
3421 cifs_reclassify_socket6(socket);
3423 cifs_reclassify_socket4(socket);
3426 rc = bind_socket(server);
3431 * Eventually check for other socket options to change from
3432 * the default. sock_setsockopt not used because it expects
3435 socket->sk->sk_rcvtimeo = 7 * HZ;
3436 socket->sk->sk_sndtimeo = 5 * HZ;
3438 /* make the bufsizes depend on wsize/rsize and max requests */
3439 if (server->noautotune) {
3440 if (socket->sk->sk_sndbuf < (200 * 1024))
3441 socket->sk->sk_sndbuf = 200 * 1024;
3442 if (socket->sk->sk_rcvbuf < (140 * 1024))
3443 socket->sk->sk_rcvbuf = 140 * 1024;
3446 if (server->tcp_nodelay) {
3448 rc = kernel_setsockopt(socket, SOL_TCP, TCP_NODELAY,
3449 (char *)&val, sizeof(val));
3451 cifs_dbg(FYI, "set TCP_NODELAY socket option error %d\n",
3455 cifs_dbg(FYI, "sndbuf %d rcvbuf %d rcvtimeo 0x%lx\n",
3456 socket->sk->sk_sndbuf,
3457 socket->sk->sk_rcvbuf, socket->sk->sk_rcvtimeo);
3459 rc = socket->ops->connect(socket, saddr, slen, 0);
3461 cifs_dbg(FYI, "Error %d connecting to server\n", rc);
3462 sock_release(socket);
3463 server->ssocket = NULL;
3467 if (sport == htons(RFC1001_PORT))
3468 rc = ip_rfc1001_connect(server);
3474 ip_connect(struct TCP_Server_Info *server)
3477 struct sockaddr_in6 *addr6 = (struct sockaddr_in6 *)&server->dstaddr;
3478 struct sockaddr_in *addr = (struct sockaddr_in *)&server->dstaddr;
3480 if (server->dstaddr.ss_family == AF_INET6)
3481 sport = &addr6->sin6_port;
3483 sport = &addr->sin_port;
3488 /* try with 445 port at first */
3489 *sport = htons(CIFS_PORT);
3491 rc = generic_ip_connect(server);
3495 /* if it failed, try with 139 port */
3496 *sport = htons(RFC1001_PORT);
3499 return generic_ip_connect(server);
3502 void reset_cifs_unix_caps(unsigned int xid, struct cifs_tcon *tcon,
3503 struct cifs_sb_info *cifs_sb, struct smb_vol *vol_info)
3505 /* if we are reconnecting then should we check to see if
3506 * any requested capabilities changed locally e.g. via
3507 * remount but we can not do much about it here
3508 * if they have (even if we could detect it by the following)
3509 * Perhaps we could add a backpointer to array of sb from tcon
3510 * or if we change to make all sb to same share the same
3511 * sb as NFS - then we only have one backpointer to sb.
3512 * What if we wanted to mount the server share twice once with
3513 * and once without posixacls or posix paths? */
3514 __u64 saved_cap = le64_to_cpu(tcon->fsUnixInfo.Capability);
3516 if (vol_info && vol_info->no_linux_ext) {
3517 tcon->fsUnixInfo.Capability = 0;
3518 tcon->unix_ext = 0; /* Unix Extensions disabled */
3519 cifs_dbg(FYI, "Linux protocol extensions disabled\n");
3521 } else if (vol_info)
3522 tcon->unix_ext = 1; /* Unix Extensions supported */
3524 if (tcon->unix_ext == 0) {
3525 cifs_dbg(FYI, "Unix extensions disabled so not set on reconnect\n");
3529 if (!CIFSSMBQFSUnixInfo(xid, tcon)) {
3530 __u64 cap = le64_to_cpu(tcon->fsUnixInfo.Capability);
3531 cifs_dbg(FYI, "unix caps which server supports %lld\n", cap);
3532 /* check for reconnect case in which we do not
3533 want to change the mount behavior if we can avoid it */
3534 if (vol_info == NULL) {
3535 /* turn off POSIX ACL and PATHNAMES if not set
3536 originally at mount time */
3537 if ((saved_cap & CIFS_UNIX_POSIX_ACL_CAP) == 0)
3538 cap &= ~CIFS_UNIX_POSIX_ACL_CAP;
3539 if ((saved_cap & CIFS_UNIX_POSIX_PATHNAMES_CAP) == 0) {
3540 if (cap & CIFS_UNIX_POSIX_PATHNAMES_CAP)
3541 cifs_dbg(VFS, "POSIXPATH support change\n");
3542 cap &= ~CIFS_UNIX_POSIX_PATHNAMES_CAP;
3543 } else if ((cap & CIFS_UNIX_POSIX_PATHNAMES_CAP) == 0) {
3544 cifs_dbg(VFS, "possible reconnect error\n");
3545 cifs_dbg(VFS, "server disabled POSIX path support\n");
3549 if (cap & CIFS_UNIX_TRANSPORT_ENCRYPTION_MANDATORY_CAP)
3550 cifs_dbg(VFS, "per-share encryption not supported yet\n");
3552 cap &= CIFS_UNIX_CAP_MASK;
3553 if (vol_info && vol_info->no_psx_acl)
3554 cap &= ~CIFS_UNIX_POSIX_ACL_CAP;
3555 else if (CIFS_UNIX_POSIX_ACL_CAP & cap) {
3556 cifs_dbg(FYI, "negotiated posix acl support\n");
3558 cifs_sb->mnt_cifs_flags |=
3559 CIFS_MOUNT_POSIXACL;
3562 if (vol_info && vol_info->posix_paths == 0)
3563 cap &= ~CIFS_UNIX_POSIX_PATHNAMES_CAP;
3564 else if (cap & CIFS_UNIX_POSIX_PATHNAMES_CAP) {
3565 cifs_dbg(FYI, "negotiate posix pathnames\n");
3567 cifs_sb->mnt_cifs_flags |=
3568 CIFS_MOUNT_POSIX_PATHS;
3571 cifs_dbg(FYI, "Negotiate caps 0x%x\n", (int)cap);
3572 #ifdef CONFIG_CIFS_DEBUG2
3573 if (cap & CIFS_UNIX_FCNTL_CAP)
3574 cifs_dbg(FYI, "FCNTL cap\n");
3575 if (cap & CIFS_UNIX_EXTATTR_CAP)
3576 cifs_dbg(FYI, "EXTATTR cap\n");
3577 if (cap & CIFS_UNIX_POSIX_PATHNAMES_CAP)
3578 cifs_dbg(FYI, "POSIX path cap\n");
3579 if (cap & CIFS_UNIX_XATTR_CAP)
3580 cifs_dbg(FYI, "XATTR cap\n");
3581 if (cap & CIFS_UNIX_POSIX_ACL_CAP)
3582 cifs_dbg(FYI, "POSIX ACL cap\n");
3583 if (cap & CIFS_UNIX_LARGE_READ_CAP)
3584 cifs_dbg(FYI, "very large read cap\n");
3585 if (cap & CIFS_UNIX_LARGE_WRITE_CAP)
3586 cifs_dbg(FYI, "very large write cap\n");
3587 if (cap & CIFS_UNIX_TRANSPORT_ENCRYPTION_CAP)
3588 cifs_dbg(FYI, "transport encryption cap\n");
3589 if (cap & CIFS_UNIX_TRANSPORT_ENCRYPTION_MANDATORY_CAP)
3590 cifs_dbg(FYI, "mandatory transport encryption cap\n");
3591 #endif /* CIFS_DEBUG2 */
3592 if (CIFSSMBSetFSUnixInfo(xid, tcon, cap)) {
3593 if (vol_info == NULL) {
3594 cifs_dbg(FYI, "resetting capabilities failed\n");
3596 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");
3602 int cifs_setup_cifs_sb(struct smb_vol *pvolume_info,
3603 struct cifs_sb_info *cifs_sb)
3605 INIT_DELAYED_WORK(&cifs_sb->prune_tlinks, cifs_prune_tlinks);
3607 spin_lock_init(&cifs_sb->tlink_tree_lock);
3608 cifs_sb->tlink_tree = RB_ROOT;
3611 * Temporarily set r/wsize for matching superblock. If we end up using
3612 * new sb then client will later negotiate it downward if needed.
3614 cifs_sb->rsize = pvolume_info->rsize;
3615 cifs_sb->wsize = pvolume_info->wsize;
3617 cifs_sb->mnt_uid = pvolume_info->linux_uid;
3618 cifs_sb->mnt_gid = pvolume_info->linux_gid;
3619 cifs_sb->mnt_file_mode = pvolume_info->file_mode;
3620 cifs_sb->mnt_dir_mode = pvolume_info->dir_mode;
3621 cifs_dbg(FYI, "file mode: 0x%hx dir mode: 0x%hx\n",
3622 cifs_sb->mnt_file_mode, cifs_sb->mnt_dir_mode);
3624 cifs_sb->actimeo = pvolume_info->actimeo;
3625 cifs_sb->local_nls = pvolume_info->local_nls;
3627 if (pvolume_info->noperm)
3628 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_NO_PERM;
3629 if (pvolume_info->setuids)
3630 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_SET_UID;
3631 if (pvolume_info->setuidfromacl)
3632 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_UID_FROM_ACL;
3633 if (pvolume_info->server_ino)
3634 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_SERVER_INUM;
3635 if (pvolume_info->remap)
3636 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_MAP_SFM_CHR;
3637 if (pvolume_info->sfu_remap)
3638 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_MAP_SPECIAL_CHR;
3639 if (pvolume_info->no_xattr)
3640 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_NO_XATTR;
3641 if (pvolume_info->sfu_emul)
3642 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_UNX_EMUL;
3643 if (pvolume_info->nobrl)
3644 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_NO_BRL;
3645 if (pvolume_info->nohandlecache)
3646 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_NO_HANDLE_CACHE;
3647 if (pvolume_info->nostrictsync)
3648 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_NOSSYNC;
3649 if (pvolume_info->mand_lock)
3650 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_NOPOSIXBRL;
3651 if (pvolume_info->rwpidforward)
3652 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_RWPIDFORWARD;
3653 if (pvolume_info->cifs_acl)
3654 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_CIFS_ACL;
3655 if (pvolume_info->backupuid_specified) {
3656 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_CIFS_BACKUPUID;
3657 cifs_sb->mnt_backupuid = pvolume_info->backupuid;
3659 if (pvolume_info->backupgid_specified) {
3660 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_CIFS_BACKUPGID;
3661 cifs_sb->mnt_backupgid = pvolume_info->backupgid;
3663 if (pvolume_info->override_uid)
3664 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_OVERR_UID;
3665 if (pvolume_info->override_gid)
3666 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_OVERR_GID;
3667 if (pvolume_info->dynperm)
3668 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_DYNPERM;
3669 if (pvolume_info->fsc)
3670 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_FSCACHE;
3671 if (pvolume_info->multiuser)
3672 cifs_sb->mnt_cifs_flags |= (CIFS_MOUNT_MULTIUSER |
3673 CIFS_MOUNT_NO_PERM);
3674 if (pvolume_info->strict_io)
3675 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_STRICT_IO;
3676 if (pvolume_info->direct_io) {
3677 cifs_dbg(FYI, "mounting share using direct i/o\n");
3678 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_DIRECT_IO;
3680 if (pvolume_info->mfsymlinks) {
3681 if (pvolume_info->sfu_emul) {
3683 * Our SFU ("Services for Unix" emulation does not allow
3684 * creating symlinks but does allow reading existing SFU
3685 * symlinks (it does allow both creating and reading SFU
3686 * style mknod and FIFOs though). When "mfsymlinks" and
3687 * "sfu" are both enabled at the same time, it allows
3688 * reading both types of symlinks, but will only create
3689 * them with mfsymlinks format. This allows better
3690 * Apple compatibility (probably better for Samba too)
3691 * while still recognizing old Windows style symlinks.
3693 cifs_dbg(VFS, "mount options mfsymlinks and sfu both enabled\n");
3695 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_MF_SYMLINKS;
3698 if ((pvolume_info->cifs_acl) && (pvolume_info->dynperm))
3699 cifs_dbg(VFS, "mount option dynperm ignored if cifsacl mount option supported\n");
3701 if (pvolume_info->prepath) {
3702 cifs_sb->prepath = kstrdup(pvolume_info->prepath, GFP_KERNEL);
3703 if (cifs_sb->prepath == NULL)
3711 cleanup_volume_info_contents(struct smb_vol *volume_info)
3713 kfree(volume_info->username);
3714 kzfree(volume_info->password);
3715 kfree(volume_info->UNC);
3716 kfree(volume_info->domainname);
3717 kfree(volume_info->iocharset);
3718 kfree(volume_info->prepath);
3722 cifs_cleanup_volume_info(struct smb_vol *volume_info)
3726 cleanup_volume_info_contents(volume_info);
3731 #ifdef CONFIG_CIFS_DFS_UPCALL
3733 * cifs_build_path_to_root returns full path to root when we do not have an
3734 * exiting connection (tcon)
3737 build_unc_path_to_root(const struct smb_vol *vol,
3738 const struct cifs_sb_info *cifs_sb)
3740 char *full_path, *pos;
3741 unsigned int pplen = vol->prepath ? strlen(vol->prepath) + 1 : 0;
3742 unsigned int unc_len = strnlen(vol->UNC, MAX_TREE_SIZE + 1);
3744 full_path = kmalloc(unc_len + pplen + 1, GFP_KERNEL);
3745 if (full_path == NULL)
3746 return ERR_PTR(-ENOMEM);
3748 strncpy(full_path, vol->UNC, unc_len);
3749 pos = full_path + unc_len;
3752 *pos = CIFS_DIR_SEP(cifs_sb);
3753 strncpy(pos + 1, vol->prepath, pplen);
3757 *pos = '\0'; /* add trailing null */
3758 convert_delimiter(full_path, CIFS_DIR_SEP(cifs_sb));
3759 cifs_dbg(FYI, "%s: full_path=%s\n", __func__, full_path);
3764 * Perform a dfs referral query for a share and (optionally) prefix
3766 * If a referral is found, cifs_sb->mountdata will be (re-)allocated
3767 * to a string containing updated options for the submount. Otherwise it
3768 * will be left untouched.
3770 * Returns the rc from get_dfs_path to the caller, which can be used to
3771 * determine whether there were referrals.
3774 expand_dfs_referral(const unsigned int xid, struct cifs_ses *ses,
3775 struct smb_vol *volume_info, struct cifs_sb_info *cifs_sb,
3779 unsigned int num_referrals = 0;
3780 struct dfs_info3_param *referrals = NULL;
3781 char *full_path = NULL, *ref_path = NULL, *mdata = NULL;
3783 full_path = build_unc_path_to_root(volume_info, cifs_sb);
3784 if (IS_ERR(full_path))
3785 return PTR_ERR(full_path);
3787 /* For DFS paths, skip the first '\' of the UNC */
3788 ref_path = check_prefix ? full_path + 1 : volume_info->UNC + 1;
3790 rc = get_dfs_path(xid, ses, ref_path, cifs_sb->local_nls,
3791 &num_referrals, &referrals, cifs_remap(cifs_sb));
3793 if (!rc && num_referrals > 0) {
3794 char *fake_devname = NULL;
3796 mdata = cifs_compose_mount_options(cifs_sb->mountdata,
3797 full_path + 1, referrals,
3800 free_dfs_info_array(referrals, num_referrals);
3802 if (IS_ERR(mdata)) {
3803 rc = PTR_ERR(mdata);
3806 cleanup_volume_info_contents(volume_info);
3807 rc = cifs_setup_volume_info(volume_info, mdata,
3808 fake_devname, false);
3810 kfree(fake_devname);
3811 kfree(cifs_sb->mountdata);
3812 cifs_sb->mountdata = mdata;
3820 cifs_setup_volume_info(struct smb_vol *volume_info, char *mount_data,
3821 const char *devname, bool is_smb3)
3825 if (cifs_parse_mount_options(mount_data, devname, volume_info, is_smb3))
3828 if (volume_info->nullauth) {
3829 cifs_dbg(FYI, "Anonymous login\n");
3830 kfree(volume_info->username);
3831 volume_info->username = NULL;
3832 } else if (volume_info->username) {
3833 /* BB fixme parse for domain name here */
3834 cifs_dbg(FYI, "Username: %s\n", volume_info->username);
3836 cifs_dbg(VFS, "No username specified\n");
3837 /* In userspace mount helper we can get user name from alternate
3838 locations such as env variables and files on disk */
3842 /* this is needed for ASCII cp to Unicode converts */
3843 if (volume_info->iocharset == NULL) {
3844 /* load_nls_default cannot return null */
3845 volume_info->local_nls = load_nls_default();
3847 volume_info->local_nls = load_nls(volume_info->iocharset);
3848 if (volume_info->local_nls == NULL) {
3849 cifs_dbg(VFS, "CIFS mount error: iocharset %s not found\n",
3850 volume_info->iocharset);
3859 cifs_get_volume_info(char *mount_data, const char *devname, bool is_smb3)
3862 struct smb_vol *volume_info;
3864 volume_info = kmalloc(sizeof(struct smb_vol), GFP_KERNEL);
3866 return ERR_PTR(-ENOMEM);
3868 rc = cifs_setup_volume_info(volume_info, mount_data, devname, is_smb3);
3870 cifs_cleanup_volume_info(volume_info);
3871 volume_info = ERR_PTR(rc);
3878 cifs_are_all_path_components_accessible(struct TCP_Server_Info *server,
3880 struct cifs_tcon *tcon,
3881 struct cifs_sb_info *cifs_sb,
3888 sep = CIFS_DIR_SEP(cifs_sb);
3891 rc = server->ops->is_path_accessible(xid, tcon, cifs_sb, "");
3893 /* skip separators */
3898 /* next separator */
3899 while (*s && *s != sep)
3903 * temporarily null-terminate the path at the end of
3904 * the current component
3908 rc = server->ops->is_path_accessible(xid, tcon, cifs_sb,
3916 cifs_mount(struct cifs_sb_info *cifs_sb, struct smb_vol *volume_info)
3920 struct cifs_ses *ses;
3921 struct cifs_tcon *tcon;
3922 struct TCP_Server_Info *server;
3924 struct tcon_link *tlink;
3925 #ifdef CONFIG_CIFS_DFS_UPCALL
3926 int referral_walks_count = 0;
3929 #ifdef CONFIG_CIFS_DFS_UPCALL
3931 /* cleanup activities if we're chasing a referral */
3932 if (referral_walks_count) {
3934 cifs_put_tcon(tcon);
3936 cifs_put_smb_ses(ses);
3938 cifs_sb->mnt_cifs_flags &= ~CIFS_MOUNT_POSIX_PATHS;
3952 /* get a reference to a tcp session */
3953 server = cifs_get_tcp_session(volume_info);
3954 if (IS_ERR(server)) {
3955 rc = PTR_ERR(server);
3958 if ((volume_info->max_credits < 20) ||
3959 (volume_info->max_credits > 60000))
3960 server->max_credits = SMB2_MAX_CREDITS_AVAILABLE;
3962 server->max_credits = volume_info->max_credits;
3963 /* get a reference to a SMB session */
3964 ses = cifs_get_smb_ses(server, volume_info);
3968 goto mount_fail_check;
3971 if ((volume_info->persistent == true) && ((ses->server->capabilities &
3972 SMB2_GLOBAL_CAP_PERSISTENT_HANDLES) == 0)) {
3973 cifs_dbg(VFS, "persistent handles not supported by server\n");
3975 goto mount_fail_check;
3978 /* search for existing tcon to this server share */
3979 tcon = cifs_get_tcon(ses, volume_info);
3984 goto mount_fail_check;
3986 goto remote_path_check;
3989 #ifdef CONFIG_CIFS_SMB311
3990 /* if new SMB3.11 POSIX extensions are supported do not remap / and \ */
3991 if (tcon->posix_extensions)
3992 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_POSIX_PATHS;
3993 #endif /* SMB3.11 */
3995 /* tell server which Unix caps we support */
3996 if (cap_unix(tcon->ses)) {
3997 /* reset of caps checks mount to see if unix extensions
3998 disabled for just this mount */
3999 reset_cifs_unix_caps(xid, tcon, cifs_sb, volume_info);
4000 if ((tcon->ses->server->tcpStatus == CifsNeedReconnect) &&
4001 (le64_to_cpu(tcon->fsUnixInfo.Capability) &
4002 CIFS_UNIX_TRANSPORT_ENCRYPTION_MANDATORY_CAP)) {
4004 goto mount_fail_check;
4007 tcon->unix_ext = 0; /* server does not support them */
4009 /* do not care if a following call succeed - informational */
4010 if (!tcon->pipe && server->ops->qfs_tcon)
4011 server->ops->qfs_tcon(xid, tcon);
4013 cifs_sb->wsize = server->ops->negotiate_wsize(tcon, volume_info);
4014 cifs_sb->rsize = server->ops->negotiate_rsize(tcon, volume_info);
4017 #ifdef CONFIG_CIFS_DFS_UPCALL
4019 * Perform an unconditional check for whether there are DFS
4020 * referrals for this path without prefix, to provide support
4021 * for DFS referrals from w2k8 servers which don't seem to respond
4022 * with PATH_NOT_COVERED to requests that include the prefix.
4023 * Chase the referral if found, otherwise continue normally.
4025 if (referral_walks_count == 0) {
4026 int refrc = expand_dfs_referral(xid, ses, volume_info, cifs_sb,
4029 referral_walks_count++;
4030 goto try_mount_again;
4035 /* check if a whole path is not remote */
4037 if (!server->ops->is_path_accessible) {
4039 goto mount_fail_check;
4042 * cifs_build_path_to_root works only when we have a valid tcon
4044 full_path = cifs_build_path_to_root(volume_info, cifs_sb, tcon,
4045 tcon->Flags & SMB_SHARE_IS_IN_DFS);
4046 if (full_path == NULL) {
4048 goto mount_fail_check;
4050 rc = server->ops->is_path_accessible(xid, tcon, cifs_sb,
4052 if (rc != 0 && rc != -EREMOTE) {
4054 goto mount_fail_check;
4057 if (rc != -EREMOTE) {
4058 rc = cifs_are_all_path_components_accessible(server,
4062 cifs_dbg(VFS, "cannot query dirs between root and final path, "
4063 "enabling CIFS_MOUNT_USE_PREFIX_PATH\n");
4064 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_USE_PREFIX_PATH;
4071 /* get referral if needed */
4072 if (rc == -EREMOTE) {
4073 #ifdef CONFIG_CIFS_DFS_UPCALL
4074 if (referral_walks_count > MAX_NESTED_LINKS) {
4076 * BB: when we implement proper loop detection,
4077 * we will remove this check. But now we need it
4078 * to prevent an indefinite loop if 'DFS tree' is
4079 * misconfigured (i.e. has loops).
4082 goto mount_fail_check;
4085 rc = expand_dfs_referral(xid, ses, volume_info, cifs_sb, true);
4088 referral_walks_count++;
4089 goto try_mount_again;
4091 goto mount_fail_check;
4092 #else /* No DFS support, return error on mount */
4098 goto mount_fail_check;
4100 /* now, hang the tcon off of the superblock */
4101 tlink = kzalloc(sizeof *tlink, GFP_KERNEL);
4102 if (tlink == NULL) {
4104 goto mount_fail_check;
4107 tlink->tl_uid = ses->linux_uid;
4108 tlink->tl_tcon = tcon;
4109 tlink->tl_time = jiffies;
4110 set_bit(TCON_LINK_MASTER, &tlink->tl_flags);
4111 set_bit(TCON_LINK_IN_TREE, &tlink->tl_flags);
4113 cifs_sb->master_tlink = tlink;
4114 spin_lock(&cifs_sb->tlink_tree_lock);
4115 tlink_rb_insert(&cifs_sb->tlink_tree, tlink);
4116 spin_unlock(&cifs_sb->tlink_tree_lock);
4118 queue_delayed_work(cifsiod_wq, &cifs_sb->prune_tlinks,
4122 /* on error free sesinfo and tcon struct if needed */
4124 /* If find_unc succeeded then rc == 0 so we can not end */
4125 /* up accidentally freeing someone elses tcon struct */
4127 cifs_put_tcon(tcon);
4129 cifs_put_smb_ses(ses);
4131 cifs_put_tcp_session(server, 0);
4140 * Issue a TREE_CONNECT request.
4143 CIFSTCon(const unsigned int xid, struct cifs_ses *ses,
4144 const char *tree, struct cifs_tcon *tcon,
4145 const struct nls_table *nls_codepage)
4147 struct smb_hdr *smb_buffer;
4148 struct smb_hdr *smb_buffer_response;
4151 unsigned char *bcc_ptr;
4154 __u16 bytes_left, count;
4159 smb_buffer = cifs_buf_get();
4160 if (smb_buffer == NULL)
4163 smb_buffer_response = smb_buffer;
4165 header_assemble(smb_buffer, SMB_COM_TREE_CONNECT_ANDX,
4166 NULL /*no tid */ , 4 /*wct */ );
4168 smb_buffer->Mid = get_next_mid(ses->server);
4169 smb_buffer->Uid = ses->Suid;
4170 pSMB = (TCONX_REQ *) smb_buffer;
4171 pSMBr = (TCONX_RSP *) smb_buffer_response;
4173 pSMB->AndXCommand = 0xFF;
4174 pSMB->Flags = cpu_to_le16(TCON_EXTENDED_SECINFO);
4175 bcc_ptr = &pSMB->Password[0];
4176 if (tcon->pipe || (ses->server->sec_mode & SECMODE_USER)) {
4177 pSMB->PasswordLength = cpu_to_le16(1); /* minimum */
4178 *bcc_ptr = 0; /* password is null byte */
4179 bcc_ptr++; /* skip password */
4180 /* already aligned so no need to do it below */
4182 pSMB->PasswordLength = cpu_to_le16(CIFS_AUTH_RESP_SIZE);
4183 /* BB FIXME add code to fail this if NTLMv2 or Kerberos
4184 specified as required (when that support is added to
4185 the vfs in the future) as only NTLM or the much
4186 weaker LANMAN (which we do not send by default) is accepted
4187 by Samba (not sure whether other servers allow
4188 NTLMv2 password here) */
4189 #ifdef CONFIG_CIFS_WEAK_PW_HASH
4190 if ((global_secflags & CIFSSEC_MAY_LANMAN) &&
4191 (ses->sectype == LANMAN))
4192 calc_lanman_hash(tcon->password, ses->server->cryptkey,
4193 ses->server->sec_mode &
4194 SECMODE_PW_ENCRYPT ? true : false,
4197 #endif /* CIFS_WEAK_PW_HASH */
4198 rc = SMBNTencrypt(tcon->password, ses->server->cryptkey,
4199 bcc_ptr, nls_codepage);
4201 cifs_dbg(FYI, "%s Can't generate NTLM rsp. Error: %d\n",
4203 cifs_buf_release(smb_buffer);
4207 bcc_ptr += CIFS_AUTH_RESP_SIZE;
4208 if (ses->capabilities & CAP_UNICODE) {
4209 /* must align unicode strings */
4210 *bcc_ptr = 0; /* null byte password */
4215 if (ses->server->sign)
4216 smb_buffer->Flags2 |= SMBFLG2_SECURITY_SIGNATURE;
4218 if (ses->capabilities & CAP_STATUS32) {
4219 smb_buffer->Flags2 |= SMBFLG2_ERR_STATUS;
4221 if (ses->capabilities & CAP_DFS) {
4222 smb_buffer->Flags2 |= SMBFLG2_DFS;
4224 if (ses->capabilities & CAP_UNICODE) {
4225 smb_buffer->Flags2 |= SMBFLG2_UNICODE;
4227 cifs_strtoUTF16((__le16 *) bcc_ptr, tree,
4228 6 /* max utf8 char length in bytes */ *
4229 (/* server len*/ + 256 /* share len */), nls_codepage);
4230 bcc_ptr += 2 * length; /* convert num 16 bit words to bytes */
4231 bcc_ptr += 2; /* skip trailing null */
4232 } else { /* ASCII */
4233 strcpy(bcc_ptr, tree);
4234 bcc_ptr += strlen(tree) + 1;
4236 strcpy(bcc_ptr, "?????");
4237 bcc_ptr += strlen("?????");
4239 count = bcc_ptr - &pSMB->Password[0];
4240 pSMB->hdr.smb_buf_length = cpu_to_be32(be32_to_cpu(
4241 pSMB->hdr.smb_buf_length) + count);
4242 pSMB->ByteCount = cpu_to_le16(count);
4244 rc = SendReceive(xid, ses, smb_buffer, smb_buffer_response, &length,
4247 /* above now done in SendReceive */
4251 tcon->tidStatus = CifsGood;
4252 tcon->need_reconnect = false;
4253 tcon->tid = smb_buffer_response->Tid;
4254 bcc_ptr = pByteArea(smb_buffer_response);
4255 bytes_left = get_bcc(smb_buffer_response);
4256 length = strnlen(bcc_ptr, bytes_left - 2);
4257 if (smb_buffer->Flags2 & SMBFLG2_UNICODE)
4263 /* skip service field (NB: this field is always ASCII) */
4265 if ((bcc_ptr[0] == 'I') && (bcc_ptr[1] == 'P') &&
4266 (bcc_ptr[2] == 'C')) {
4267 cifs_dbg(FYI, "IPC connection\n");
4271 } else if (length == 2) {
4272 if ((bcc_ptr[0] == 'A') && (bcc_ptr[1] == ':')) {
4273 /* the most common case */
4274 cifs_dbg(FYI, "disk share connection\n");
4277 bcc_ptr += length + 1;
4278 bytes_left -= (length + 1);
4279 strlcpy(tcon->treeName, tree, sizeof(tcon->treeName));
4281 /* mostly informational -- no need to fail on error here */
4282 kfree(tcon->nativeFileSystem);
4283 tcon->nativeFileSystem = cifs_strndup_from_utf16(bcc_ptr,
4284 bytes_left, is_unicode,
4287 cifs_dbg(FYI, "nativeFileSystem=%s\n", tcon->nativeFileSystem);
4289 if ((smb_buffer_response->WordCount == 3) ||
4290 (smb_buffer_response->WordCount == 7))
4291 /* field is in same location */
4292 tcon->Flags = le16_to_cpu(pSMBr->OptionalSupport);
4295 cifs_dbg(FYI, "Tcon flags: 0x%x\n", tcon->Flags);
4298 cifs_buf_release(smb_buffer);
4302 static void delayed_free(struct rcu_head *p)
4304 struct cifs_sb_info *sbi = container_of(p, struct cifs_sb_info, rcu);
4305 unload_nls(sbi->local_nls);
4310 cifs_umount(struct cifs_sb_info *cifs_sb)
4312 struct rb_root *root = &cifs_sb->tlink_tree;
4313 struct rb_node *node;
4314 struct tcon_link *tlink;
4316 cancel_delayed_work_sync(&cifs_sb->prune_tlinks);
4318 spin_lock(&cifs_sb->tlink_tree_lock);
4319 while ((node = rb_first(root))) {
4320 tlink = rb_entry(node, struct tcon_link, tl_rbnode);
4321 cifs_get_tlink(tlink);
4322 clear_bit(TCON_LINK_IN_TREE, &tlink->tl_flags);
4323 rb_erase(node, root);
4325 spin_unlock(&cifs_sb->tlink_tree_lock);
4326 cifs_put_tlink(tlink);
4327 spin_lock(&cifs_sb->tlink_tree_lock);
4329 spin_unlock(&cifs_sb->tlink_tree_lock);
4331 kfree(cifs_sb->mountdata);
4332 kfree(cifs_sb->prepath);
4333 call_rcu(&cifs_sb->rcu, delayed_free);
4337 cifs_negotiate_protocol(const unsigned int xid, struct cifs_ses *ses)
4340 struct TCP_Server_Info *server = ses->server;
4342 if (!server->ops->need_neg || !server->ops->negotiate)
4345 /* only send once per connect */
4346 if (!server->ops->need_neg(server))
4349 set_credits(server, 1);
4351 rc = server->ops->negotiate(xid, ses);
4353 spin_lock(&GlobalMid_Lock);
4354 if (server->tcpStatus == CifsNeedNegotiate)
4355 server->tcpStatus = CifsGood;
4358 spin_unlock(&GlobalMid_Lock);
4365 cifs_setup_session(const unsigned int xid, struct cifs_ses *ses,
4366 struct nls_table *nls_info)
4369 struct TCP_Server_Info *server = ses->server;
4371 ses->capabilities = server->capabilities;
4372 if (linuxExtEnabled == 0)
4373 ses->capabilities &= (~server->vals->cap_unix);
4375 cifs_dbg(FYI, "Security Mode: 0x%x Capabilities: 0x%x TimeAdjust: %d\n",
4376 server->sec_mode, server->capabilities, server->timeAdj);
4378 if (ses->auth_key.response) {
4379 cifs_dbg(FYI, "Free previous auth_key.response = %p\n",
4380 ses->auth_key.response);
4381 kfree(ses->auth_key.response);
4382 ses->auth_key.response = NULL;
4383 ses->auth_key.len = 0;
4386 if (server->ops->sess_setup)
4387 rc = server->ops->sess_setup(xid, ses, nls_info);
4390 cifs_dbg(VFS, "Send error in SessSetup = %d\n", rc);
4396 cifs_set_vol_auth(struct smb_vol *vol, struct cifs_ses *ses)
4398 vol->sectype = ses->sectype;
4400 /* krb5 is special, since we don't need username or pw */
4401 if (vol->sectype == Kerberos)
4404 return cifs_set_cifscreds(vol, ses);
4407 static struct cifs_tcon *
4408 cifs_construct_tcon(struct cifs_sb_info *cifs_sb, kuid_t fsuid)
4411 struct cifs_tcon *master_tcon = cifs_sb_master_tcon(cifs_sb);
4412 struct cifs_ses *ses;
4413 struct cifs_tcon *tcon = NULL;
4414 struct smb_vol *vol_info;
4416 vol_info = kzalloc(sizeof(*vol_info), GFP_KERNEL);
4417 if (vol_info == NULL)
4418 return ERR_PTR(-ENOMEM);
4420 vol_info->local_nls = cifs_sb->local_nls;
4421 vol_info->linux_uid = fsuid;
4422 vol_info->cred_uid = fsuid;
4423 vol_info->UNC = master_tcon->treeName;
4424 vol_info->retry = master_tcon->retry;
4425 vol_info->nocase = master_tcon->nocase;
4426 vol_info->nohandlecache = master_tcon->nohandlecache;
4427 vol_info->local_lease = master_tcon->local_lease;
4428 vol_info->no_linux_ext = !master_tcon->unix_ext;
4429 vol_info->sectype = master_tcon->ses->sectype;
4430 vol_info->sign = master_tcon->ses->sign;
4432 rc = cifs_set_vol_auth(vol_info, master_tcon->ses);
4438 /* get a reference for the same TCP session */
4439 spin_lock(&cifs_tcp_ses_lock);
4440 ++master_tcon->ses->server->srv_count;
4441 spin_unlock(&cifs_tcp_ses_lock);
4443 ses = cifs_get_smb_ses(master_tcon->ses->server, vol_info);
4445 tcon = (struct cifs_tcon *)ses;
4446 cifs_put_tcp_session(master_tcon->ses->server, 0);
4450 tcon = cifs_get_tcon(ses, vol_info);
4452 cifs_put_smb_ses(ses);
4456 #ifdef CONFIG_CIFS_SMB311
4457 /* if new SMB3.11 POSIX extensions are supported do not remap / and \ */
4458 if (tcon->posix_extensions)
4459 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_POSIX_PATHS;
4460 #endif /* SMB3.11 */
4462 reset_cifs_unix_caps(0, tcon, NULL, vol_info);
4465 kfree(vol_info->username);
4466 kzfree(vol_info->password);
4473 cifs_sb_master_tcon(struct cifs_sb_info *cifs_sb)
4475 return tlink_tcon(cifs_sb_master_tlink(cifs_sb));
4478 /* find and return a tlink with given uid */
4479 static struct tcon_link *
4480 tlink_rb_search(struct rb_root *root, kuid_t uid)
4482 struct rb_node *node = root->rb_node;
4483 struct tcon_link *tlink;
4486 tlink = rb_entry(node, struct tcon_link, tl_rbnode);
4488 if (uid_gt(tlink->tl_uid, uid))
4489 node = node->rb_left;
4490 else if (uid_lt(tlink->tl_uid, uid))
4491 node = node->rb_right;
4498 /* insert a tcon_link into the tree */
4500 tlink_rb_insert(struct rb_root *root, struct tcon_link *new_tlink)
4502 struct rb_node **new = &(root->rb_node), *parent = NULL;
4503 struct tcon_link *tlink;
4506 tlink = rb_entry(*new, struct tcon_link, tl_rbnode);
4509 if (uid_gt(tlink->tl_uid, new_tlink->tl_uid))
4510 new = &((*new)->rb_left);
4512 new = &((*new)->rb_right);
4515 rb_link_node(&new_tlink->tl_rbnode, parent, new);
4516 rb_insert_color(&new_tlink->tl_rbnode, root);
4520 * Find or construct an appropriate tcon given a cifs_sb and the fsuid of the
4523 * If the superblock doesn't refer to a multiuser mount, then just return
4524 * the master tcon for the mount.
4526 * First, search the rbtree for an existing tcon for this fsuid. If one
4527 * exists, then check to see if it's pending construction. If it is then wait
4528 * for construction to complete. Once it's no longer pending, check to see if
4529 * it failed and either return an error or retry construction, depending on
4532 * If one doesn't exist then insert a new tcon_link struct into the tree and
4533 * try to construct a new one.
4536 cifs_sb_tlink(struct cifs_sb_info *cifs_sb)
4539 kuid_t fsuid = current_fsuid();
4540 struct tcon_link *tlink, *newtlink;
4542 if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MULTIUSER))
4543 return cifs_get_tlink(cifs_sb_master_tlink(cifs_sb));
4545 spin_lock(&cifs_sb->tlink_tree_lock);
4546 tlink = tlink_rb_search(&cifs_sb->tlink_tree, fsuid);
4548 cifs_get_tlink(tlink);
4549 spin_unlock(&cifs_sb->tlink_tree_lock);
4551 if (tlink == NULL) {
4552 newtlink = kzalloc(sizeof(*tlink), GFP_KERNEL);
4553 if (newtlink == NULL)
4554 return ERR_PTR(-ENOMEM);
4555 newtlink->tl_uid = fsuid;
4556 newtlink->tl_tcon = ERR_PTR(-EACCES);
4557 set_bit(TCON_LINK_PENDING, &newtlink->tl_flags);
4558 set_bit(TCON_LINK_IN_TREE, &newtlink->tl_flags);
4559 cifs_get_tlink(newtlink);
4561 spin_lock(&cifs_sb->tlink_tree_lock);
4562 /* was one inserted after previous search? */
4563 tlink = tlink_rb_search(&cifs_sb->tlink_tree, fsuid);
4565 cifs_get_tlink(tlink);
4566 spin_unlock(&cifs_sb->tlink_tree_lock);
4568 goto wait_for_construction;
4571 tlink_rb_insert(&cifs_sb->tlink_tree, tlink);
4572 spin_unlock(&cifs_sb->tlink_tree_lock);
4574 wait_for_construction:
4575 ret = wait_on_bit(&tlink->tl_flags, TCON_LINK_PENDING,
4576 TASK_INTERRUPTIBLE);
4578 cifs_put_tlink(tlink);
4579 return ERR_PTR(-ERESTARTSYS);
4582 /* if it's good, return it */
4583 if (!IS_ERR(tlink->tl_tcon))
4586 /* return error if we tried this already recently */
4587 if (time_before(jiffies, tlink->tl_time + TLINK_ERROR_EXPIRE)) {
4588 cifs_put_tlink(tlink);
4589 return ERR_PTR(-EACCES);
4592 if (test_and_set_bit(TCON_LINK_PENDING, &tlink->tl_flags))
4593 goto wait_for_construction;
4596 tlink->tl_tcon = cifs_construct_tcon(cifs_sb, fsuid);
4597 clear_bit(TCON_LINK_PENDING, &tlink->tl_flags);
4598 wake_up_bit(&tlink->tl_flags, TCON_LINK_PENDING);
4600 if (IS_ERR(tlink->tl_tcon)) {
4601 cifs_put_tlink(tlink);
4602 return ERR_PTR(-EACCES);
4609 * periodic workqueue job that scans tcon_tree for a superblock and closes
4613 cifs_prune_tlinks(struct work_struct *work)
4615 struct cifs_sb_info *cifs_sb = container_of(work, struct cifs_sb_info,
4617 struct rb_root *root = &cifs_sb->tlink_tree;
4618 struct rb_node *node;
4619 struct rb_node *tmp;
4620 struct tcon_link *tlink;
4623 * Because we drop the spinlock in the loop in order to put the tlink
4624 * it's not guarded against removal of links from the tree. The only
4625 * places that remove entries from the tree are this function and
4626 * umounts. Because this function is non-reentrant and is canceled
4627 * before umount can proceed, this is safe.
4629 spin_lock(&cifs_sb->tlink_tree_lock);
4630 node = rb_first(root);
4631 while (node != NULL) {
4633 node = rb_next(tmp);
4634 tlink = rb_entry(tmp, struct tcon_link, tl_rbnode);
4636 if (test_bit(TCON_LINK_MASTER, &tlink->tl_flags) ||
4637 atomic_read(&tlink->tl_count) != 0 ||
4638 time_after(tlink->tl_time + TLINK_IDLE_EXPIRE, jiffies))
4641 cifs_get_tlink(tlink);
4642 clear_bit(TCON_LINK_IN_TREE, &tlink->tl_flags);
4643 rb_erase(tmp, root);
4645 spin_unlock(&cifs_sb->tlink_tree_lock);
4646 cifs_put_tlink(tlink);
4647 spin_lock(&cifs_sb->tlink_tree_lock);
4649 spin_unlock(&cifs_sb->tlink_tree_lock);
4651 queue_delayed_work(cifsiod_wq, &cifs_sb->prune_tlinks,