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/mm.h>
25 #include <linux/sched/signal.h>
26 #include <linux/list.h>
27 #include <linux/wait.h>
28 #include <linux/slab.h>
29 #include <linux/pagemap.h>
30 #include <linux/ctype.h>
31 #include <linux/utsname.h>
32 #include <linux/mempool.h>
33 #include <linux/delay.h>
34 #include <linux/completion.h>
35 #include <linux/kthread.h>
36 #include <linux/pagevec.h>
37 #include <linux/freezer.h>
38 #include <linux/namei.h>
39 #include <linux/uuid.h>
40 #include <linux/uaccess.h>
41 #include <asm/processor.h>
42 #include <linux/inet.h>
43 #include <linux/module.h>
44 #include <keys/user-type.h>
46 #include <linux/parser.h>
47 #include <linux/bvec.h>
50 #include "cifsproto.h"
51 #include "cifs_unicode.h"
52 #include "cifs_debug.h"
53 #include "cifs_fs_sb.h"
56 #include "rfc1002pdu.h"
58 #include "smb2proto.h"
59 #include "smbdirect.h"
60 #include "dns_resolve.h"
61 #ifdef CONFIG_CIFS_DFS_UPCALL
62 #include "dfs_cache.h"
65 extern mempool_t *cifs_req_poolp;
66 extern bool disable_legacy_dialects;
68 /* FIXME: should these be tunable? */
69 #define TLINK_ERROR_EXPIRE (1 * HZ)
70 #define TLINK_IDLE_EXPIRE (600 * HZ)
73 /* Mount options that take no arguments */
74 Opt_user_xattr, Opt_nouser_xattr,
75 Opt_forceuid, Opt_noforceuid,
76 Opt_forcegid, Opt_noforcegid,
77 Opt_noblocksend, Opt_noautotune, Opt_nolease,
78 Opt_hard, Opt_soft, Opt_perm, Opt_noperm,
79 Opt_mapposix, Opt_nomapposix,
80 Opt_mapchars, Opt_nomapchars, Opt_sfu,
81 Opt_nosfu, Opt_nodfs, Opt_posixpaths,
82 Opt_noposixpaths, Opt_nounix, Opt_unix,
85 Opt_handlecache, Opt_nohandlecache,
86 Opt_forcemandatorylock, Opt_setuidfromacl, Opt_setuids,
87 Opt_nosetuids, Opt_dynperm, Opt_nodynperm,
88 Opt_nohard, Opt_nosoft,
90 Opt_nostrictsync, Opt_strictsync,
91 Opt_serverino, Opt_noserverino,
92 Opt_rwpidforward, Opt_cifsacl, Opt_nocifsacl,
93 Opt_acl, Opt_noacl, Opt_locallease,
94 Opt_sign, Opt_ignore_signature, Opt_seal, Opt_noac,
95 Opt_fsc, Opt_mfsymlinks,
96 Opt_multiuser, Opt_sloppy, Opt_nosharesock,
97 Opt_persistent, Opt_nopersistent,
98 Opt_resilient, Opt_noresilient,
99 Opt_domainauto, Opt_rdma, Opt_modesid, Opt_rootfs,
100 Opt_multichannel, Opt_nomultichannel,
103 /* Mount options which take numeric value */
104 Opt_backupuid, Opt_backupgid, Opt_uid,
105 Opt_cruid, Opt_gid, Opt_file_mode,
106 Opt_dirmode, Opt_port,
108 Opt_blocksize, Opt_rsize, Opt_wsize, Opt_actimeo,
109 Opt_echo_interval, Opt_max_credits, Opt_handletimeout,
110 Opt_snapshot, Opt_max_channels,
112 /* Mount options which take string value */
113 Opt_user, Opt_pass, Opt_ip,
114 Opt_domain, Opt_srcaddr, Opt_iocharset,
115 Opt_netbiosname, Opt_servern,
116 Opt_ver, Opt_vers, Opt_sec, Opt_cache,
118 /* Mount options to be ignored */
121 /* Options which could be blank */
129 static const match_table_t cifs_mount_option_tokens = {
131 { Opt_user_xattr, "user_xattr" },
132 { Opt_nouser_xattr, "nouser_xattr" },
133 { Opt_forceuid, "forceuid" },
134 { Opt_noforceuid, "noforceuid" },
135 { Opt_forcegid, "forcegid" },
136 { Opt_noforcegid, "noforcegid" },
137 { Opt_noblocksend, "noblocksend" },
138 { Opt_noautotune, "noautotune" },
139 { Opt_nolease, "nolease" },
140 { Opt_hard, "hard" },
141 { Opt_soft, "soft" },
142 { Opt_perm, "perm" },
143 { Opt_noperm, "noperm" },
144 { Opt_mapchars, "mapchars" }, /* SFU style */
145 { Opt_nomapchars, "nomapchars" },
146 { Opt_mapposix, "mapposix" }, /* SFM style */
147 { Opt_nomapposix, "nomapposix" },
149 { Opt_nosfu, "nosfu" },
150 { Opt_nodfs, "nodfs" },
151 { Opt_posixpaths, "posixpaths" },
152 { Opt_noposixpaths, "noposixpaths" },
153 { Opt_nounix, "nounix" },
154 { Opt_nounix, "nolinux" },
155 { Opt_nounix, "noposix" },
156 { Opt_unix, "unix" },
157 { Opt_unix, "linux" },
158 { Opt_unix, "posix" },
159 { Opt_nocase, "nocase" },
160 { Opt_nocase, "ignorecase" },
162 { Opt_nobrl, "nobrl" },
163 { Opt_handlecache, "handlecache" },
164 { Opt_nohandlecache, "nohandlecache" },
165 { Opt_nobrl, "nolock" },
166 { Opt_forcemandatorylock, "forcemandatorylock" },
167 { Opt_forcemandatorylock, "forcemand" },
168 { Opt_setuids, "setuids" },
169 { Opt_nosetuids, "nosetuids" },
170 { Opt_setuidfromacl, "idsfromsid" },
171 { Opt_dynperm, "dynperm" },
172 { Opt_nodynperm, "nodynperm" },
173 { Opt_nohard, "nohard" },
174 { Opt_nosoft, "nosoft" },
175 { Opt_nointr, "nointr" },
176 { Opt_intr, "intr" },
177 { Opt_nostrictsync, "nostrictsync" },
178 { Opt_strictsync, "strictsync" },
179 { Opt_serverino, "serverino" },
180 { Opt_noserverino, "noserverino" },
181 { Opt_rwpidforward, "rwpidforward" },
182 { Opt_modesid, "modefromsid" },
183 { Opt_cifsacl, "cifsacl" },
184 { Opt_nocifsacl, "nocifsacl" },
186 { Opt_noacl, "noacl" },
187 { Opt_locallease, "locallease" },
188 { Opt_sign, "sign" },
189 { Opt_ignore_signature, "signloosely" },
190 { Opt_seal, "seal" },
191 { Opt_noac, "noac" },
193 { Opt_mfsymlinks, "mfsymlinks" },
194 { Opt_multiuser, "multiuser" },
195 { Opt_sloppy, "sloppy" },
196 { Opt_nosharesock, "nosharesock" },
197 { Opt_persistent, "persistenthandles"},
198 { Opt_nopersistent, "nopersistenthandles"},
199 { Opt_resilient, "resilienthandles"},
200 { Opt_noresilient, "noresilienthandles"},
201 { Opt_domainauto, "domainauto"},
203 { Opt_multichannel, "multichannel" },
204 { Opt_nomultichannel, "nomultichannel" },
206 { Opt_backupuid, "backupuid=%s" },
207 { Opt_backupgid, "backupgid=%s" },
208 { Opt_uid, "uid=%s" },
209 { Opt_cruid, "cruid=%s" },
210 { Opt_gid, "gid=%s" },
211 { Opt_file_mode, "file_mode=%s" },
212 { Opt_dirmode, "dirmode=%s" },
213 { Opt_dirmode, "dir_mode=%s" },
214 { Opt_port, "port=%s" },
215 { Opt_min_enc_offload, "esize=%s" },
216 { Opt_blocksize, "bsize=%s" },
217 { Opt_rsize, "rsize=%s" },
218 { Opt_wsize, "wsize=%s" },
219 { Opt_actimeo, "actimeo=%s" },
220 { Opt_handletimeout, "handletimeout=%s" },
221 { Opt_echo_interval, "echo_interval=%s" },
222 { Opt_max_credits, "max_credits=%s" },
223 { Opt_snapshot, "snapshot=%s" },
224 { Opt_max_channels, "max_channels=%s" },
225 { Opt_compress, "compress=%s" },
227 { Opt_blank_user, "user=" },
228 { Opt_blank_user, "username=" },
229 { Opt_user, "user=%s" },
230 { Opt_user, "username=%s" },
231 { Opt_blank_pass, "pass=" },
232 { Opt_blank_pass, "password=" },
233 { Opt_pass, "pass=%s" },
234 { Opt_pass, "password=%s" },
235 { Opt_blank_ip, "ip=" },
236 { Opt_blank_ip, "addr=" },
238 { Opt_ip, "addr=%s" },
239 { Opt_ignore, "unc=%s" },
240 { Opt_ignore, "target=%s" },
241 { Opt_ignore, "path=%s" },
242 { Opt_domain, "dom=%s" },
243 { Opt_domain, "domain=%s" },
244 { Opt_domain, "workgroup=%s" },
245 { Opt_srcaddr, "srcaddr=%s" },
246 { Opt_ignore, "prefixpath=%s" },
247 { Opt_iocharset, "iocharset=%s" },
248 { Opt_netbiosname, "netbiosname=%s" },
249 { Opt_servern, "servern=%s" },
250 { Opt_ver, "ver=%s" },
251 { Opt_vers, "vers=%s" },
252 { Opt_sec, "sec=%s" },
253 { Opt_cache, "cache=%s" },
255 { Opt_ignore, "cred" },
256 { Opt_ignore, "credentials" },
257 { Opt_ignore, "cred=%s" },
258 { Opt_ignore, "credentials=%s" },
259 { Opt_ignore, "guest" },
260 { Opt_ignore, "rw" },
261 { Opt_ignore, "ro" },
262 { Opt_ignore, "suid" },
263 { Opt_ignore, "nosuid" },
264 { Opt_ignore, "exec" },
265 { Opt_ignore, "noexec" },
266 { Opt_ignore, "nodev" },
267 { Opt_ignore, "noauto" },
268 { Opt_ignore, "dev" },
269 { Opt_ignore, "mand" },
270 { Opt_ignore, "nomand" },
271 { Opt_ignore, "relatime" },
272 { Opt_ignore, "_netdev" },
273 { Opt_rootfs, "rootfs" },
279 Opt_sec_krb5, Opt_sec_krb5i, Opt_sec_krb5p,
280 Opt_sec_ntlmsspi, Opt_sec_ntlmssp,
281 Opt_ntlm, Opt_sec_ntlmi, Opt_sec_ntlmv2,
282 Opt_sec_ntlmv2i, Opt_sec_lanman,
288 static const match_table_t cifs_secflavor_tokens = {
289 { Opt_sec_krb5, "krb5" },
290 { Opt_sec_krb5i, "krb5i" },
291 { Opt_sec_krb5p, "krb5p" },
292 { Opt_sec_ntlmsspi, "ntlmsspi" },
293 { Opt_sec_ntlmssp, "ntlmssp" },
294 { Opt_ntlm, "ntlm" },
295 { Opt_sec_ntlmi, "ntlmi" },
296 { Opt_sec_ntlmv2, "nontlm" },
297 { Opt_sec_ntlmv2, "ntlmv2" },
298 { Opt_sec_ntlmv2i, "ntlmv2i" },
299 { Opt_sec_lanman, "lanman" },
300 { Opt_sec_none, "none" },
302 { Opt_sec_err, NULL }
315 static const match_table_t cifs_cacheflavor_tokens = {
316 { Opt_cache_loose, "loose" },
317 { Opt_cache_strict, "strict" },
318 { Opt_cache_none, "none" },
319 { Opt_cache_ro, "ro" },
320 { Opt_cache_rw, "singleclient" },
321 { Opt_cache_err, NULL }
324 static const match_table_t cifs_smb_version_tokens = {
325 { Smb_1, SMB1_VERSION_STRING },
326 { Smb_20, SMB20_VERSION_STRING},
327 { Smb_21, SMB21_VERSION_STRING },
328 { Smb_30, SMB30_VERSION_STRING },
329 { Smb_302, SMB302_VERSION_STRING },
330 { Smb_302, ALT_SMB302_VERSION_STRING },
331 { Smb_311, SMB311_VERSION_STRING },
332 { Smb_311, ALT_SMB311_VERSION_STRING },
333 { Smb_3any, SMB3ANY_VERSION_STRING },
334 { Smb_default, SMBDEFAULT_VERSION_STRING },
335 { Smb_version_err, NULL }
338 static int ip_connect(struct TCP_Server_Info *server);
339 static int generic_ip_connect(struct TCP_Server_Info *server);
340 static void tlink_rb_insert(struct rb_root *root, struct tcon_link *new_tlink);
341 static void cifs_prune_tlinks(struct work_struct *work);
342 static char *extract_hostname(const char *unc);
345 * Resolve hostname and set ip addr in tcp ses. Useful for hostnames that may
346 * get their ip addresses changed at some point.
348 * This should be called with server->srv_mutex held.
350 #ifdef CONFIG_CIFS_DFS_UPCALL
351 static int reconn_set_ipaddr(struct TCP_Server_Info *server)
355 char *unc, *ipaddr = NULL;
357 if (!server->hostname)
360 len = strlen(server->hostname) + 3;
362 unc = kmalloc(len, GFP_KERNEL);
364 cifs_dbg(FYI, "%s: failed to create UNC path\n", __func__);
367 scnprintf(unc, len, "\\\\%s", server->hostname);
369 rc = dns_resolve_server_name_to_ip(unc, &ipaddr);
373 cifs_dbg(FYI, "%s: failed to resolve server part of %s to IP: %d\n",
374 __func__, server->hostname, rc);
378 spin_lock(&cifs_tcp_ses_lock);
379 rc = cifs_convert_address((struct sockaddr *)&server->dstaddr, ipaddr,
381 spin_unlock(&cifs_tcp_ses_lock);
387 static inline int reconn_set_ipaddr(struct TCP_Server_Info *server)
393 #ifdef CONFIG_CIFS_DFS_UPCALL
394 /* These functions must be called with server->srv_mutex held */
395 static void reconn_inval_dfs_target(struct TCP_Server_Info *server,
396 struct cifs_sb_info *cifs_sb,
397 struct dfs_cache_tgt_list *tgt_list,
398 struct dfs_cache_tgt_iterator **tgt_it)
402 if (!cifs_sb || !cifs_sb->origin_fullpath || !tgt_list ||
407 *tgt_it = dfs_cache_get_tgt_iterator(tgt_list);
409 *tgt_it = dfs_cache_get_next_tgt(tgt_list, *tgt_it);
411 *tgt_it = dfs_cache_get_tgt_iterator(tgt_list);
414 cifs_dbg(FYI, "%s: UNC: %s\n", __func__, cifs_sb->origin_fullpath);
416 name = dfs_cache_get_tgt_name(*tgt_it);
418 kfree(server->hostname);
420 server->hostname = extract_hostname(name);
421 if (IS_ERR(server->hostname)) {
423 "%s: failed to extract hostname from target: %ld\n",
424 __func__, PTR_ERR(server->hostname));
428 static inline int reconn_setup_dfs_targets(struct cifs_sb_info *cifs_sb,
429 struct dfs_cache_tgt_list *tl,
430 struct dfs_cache_tgt_iterator **it)
432 if (!cifs_sb->origin_fullpath)
434 return dfs_cache_noreq_find(cifs_sb->origin_fullpath + 1, NULL, tl);
439 * cifs tcp session reconnection
441 * mark tcp session as reconnecting so temporarily locked
442 * mark all smb sessions as reconnecting for tcp session
443 * reconnect tcp session
444 * wake up waiters on reconnection? - (not needed currently)
447 cifs_reconnect(struct TCP_Server_Info *server)
450 struct list_head *tmp, *tmp2;
451 struct cifs_ses *ses;
452 struct cifs_tcon *tcon;
453 struct mid_q_entry *mid_entry;
454 struct list_head retry_list;
455 #ifdef CONFIG_CIFS_DFS_UPCALL
456 struct super_block *sb = NULL;
457 struct cifs_sb_info *cifs_sb = NULL;
458 struct dfs_cache_tgt_list tgt_list = {0};
459 struct dfs_cache_tgt_iterator *tgt_it = NULL;
462 spin_lock(&GlobalMid_Lock);
463 server->nr_targets = 1;
464 #ifdef CONFIG_CIFS_DFS_UPCALL
465 spin_unlock(&GlobalMid_Lock);
466 sb = cifs_get_tcp_super(server);
469 cifs_dbg(FYI, "%s: will not do DFS failover: rc = %d\n",
473 cifs_sb = CIFS_SB(sb);
475 rc = reconn_setup_dfs_targets(cifs_sb, &tgt_list, &tgt_it);
476 if (rc && (rc != -EOPNOTSUPP)) {
477 cifs_server_dbg(VFS, "%s: no target servers for DFS failover\n",
480 server->nr_targets = dfs_cache_get_nr_tgts(&tgt_list);
483 cifs_dbg(FYI, "%s: will retry %d target(s)\n", __func__,
485 spin_lock(&GlobalMid_Lock);
487 if (server->tcpStatus == CifsExiting) {
488 /* the demux thread will exit normally
489 next time through the loop */
490 spin_unlock(&GlobalMid_Lock);
491 #ifdef CONFIG_CIFS_DFS_UPCALL
492 dfs_cache_free_tgts(&tgt_list);
493 cifs_put_tcp_super(sb);
495 wake_up(&server->response_q);
498 server->tcpStatus = CifsNeedReconnect;
499 spin_unlock(&GlobalMid_Lock);
501 server->max_read = 0;
503 cifs_dbg(FYI, "Mark tcp session as need reconnect\n");
504 trace_smb3_reconnect(server->CurrentMid, server->hostname);
506 /* before reconnecting the tcp session, mark the smb session (uid)
507 and the tid bad so they are not used until reconnected */
508 cifs_dbg(FYI, "%s: marking sessions and tcons for reconnect\n",
510 spin_lock(&cifs_tcp_ses_lock);
511 list_for_each(tmp, &server->smb_ses_list) {
512 ses = list_entry(tmp, struct cifs_ses, smb_ses_list);
513 ses->need_reconnect = true;
514 list_for_each(tmp2, &ses->tcon_list) {
515 tcon = list_entry(tmp2, struct cifs_tcon, tcon_list);
516 tcon->need_reconnect = true;
519 ses->tcon_ipc->need_reconnect = true;
521 spin_unlock(&cifs_tcp_ses_lock);
523 /* do not want to be sending data on a socket we are freeing */
524 cifs_dbg(FYI, "%s: tearing down socket\n", __func__);
525 mutex_lock(&server->srv_mutex);
526 if (server->ssocket) {
527 cifs_dbg(FYI, "State: 0x%x Flags: 0x%lx\n",
528 server->ssocket->state, server->ssocket->flags);
529 kernel_sock_shutdown(server->ssocket, SHUT_WR);
530 cifs_dbg(FYI, "Post shutdown state: 0x%x Flags: 0x%lx\n",
531 server->ssocket->state, server->ssocket->flags);
532 sock_release(server->ssocket);
533 server->ssocket = NULL;
535 server->sequence_number = 0;
536 server->session_estab = false;
537 kfree(server->session_key.response);
538 server->session_key.response = NULL;
539 server->session_key.len = 0;
540 server->lstrp = jiffies;
542 /* mark submitted MIDs for retry and issue callback */
543 INIT_LIST_HEAD(&retry_list);
544 cifs_dbg(FYI, "%s: moving mids to private list\n", __func__);
545 spin_lock(&GlobalMid_Lock);
546 list_for_each_safe(tmp, tmp2, &server->pending_mid_q) {
547 mid_entry = list_entry(tmp, struct mid_q_entry, qhead);
548 kref_get(&mid_entry->refcount);
549 if (mid_entry->mid_state == MID_REQUEST_SUBMITTED)
550 mid_entry->mid_state = MID_RETRY_NEEDED;
551 list_move(&mid_entry->qhead, &retry_list);
552 mid_entry->mid_flags |= MID_DELETED;
554 spin_unlock(&GlobalMid_Lock);
555 mutex_unlock(&server->srv_mutex);
557 cifs_dbg(FYI, "%s: issuing mid callbacks\n", __func__);
558 list_for_each_safe(tmp, tmp2, &retry_list) {
559 mid_entry = list_entry(tmp, struct mid_q_entry, qhead);
560 list_del_init(&mid_entry->qhead);
561 mid_entry->callback(mid_entry);
562 cifs_mid_q_entry_release(mid_entry);
565 if (cifs_rdma_enabled(server)) {
566 mutex_lock(&server->srv_mutex);
567 smbd_destroy(server);
568 mutex_unlock(&server->srv_mutex);
574 mutex_lock(&server->srv_mutex);
576 * Set up next DFS target server (if any) for reconnect. If DFS
577 * feature is disabled, then we will retry last server we
578 * connected to before.
580 if (cifs_rdma_enabled(server))
581 rc = smbd_reconnect(server);
583 rc = generic_ip_connect(server);
585 cifs_dbg(FYI, "reconnect error %d\n", rc);
586 #ifdef CONFIG_CIFS_DFS_UPCALL
587 reconn_inval_dfs_target(server, cifs_sb, &tgt_list,
590 rc = reconn_set_ipaddr(server);
592 cifs_dbg(FYI, "%s: failed to resolve hostname: %d\n",
595 mutex_unlock(&server->srv_mutex);
598 atomic_inc(&tcpSesReconnectCount);
599 set_credits(server, 1);
600 spin_lock(&GlobalMid_Lock);
601 if (server->tcpStatus != CifsExiting)
602 server->tcpStatus = CifsNeedNegotiate;
603 spin_unlock(&GlobalMid_Lock);
604 mutex_unlock(&server->srv_mutex);
606 } while (server->tcpStatus == CifsNeedReconnect);
608 #ifdef CONFIG_CIFS_DFS_UPCALL
610 rc = dfs_cache_noreq_update_tgthint(cifs_sb->origin_fullpath + 1,
613 cifs_server_dbg(VFS, "%s: failed to update DFS target hint: rc = %d\n",
616 rc = dfs_cache_update_vol(cifs_sb->origin_fullpath, server);
618 cifs_server_dbg(VFS, "%s: failed to update vol info in DFS cache: rc = %d\n",
621 dfs_cache_free_tgts(&tgt_list);
625 cifs_put_tcp_super(sb);
627 if (server->tcpStatus == CifsNeedNegotiate)
628 mod_delayed_work(cifsiod_wq, &server->echo, 0);
630 wake_up(&server->response_q);
635 cifs_echo_request(struct work_struct *work)
638 struct TCP_Server_Info *server = container_of(work,
639 struct TCP_Server_Info, echo.work);
640 unsigned long echo_interval;
643 * If we need to renegotiate, set echo interval to zero to
644 * immediately call echo service where we can renegotiate.
646 if (server->tcpStatus == CifsNeedNegotiate)
649 echo_interval = server->echo_interval;
652 * We cannot send an echo if it is disabled.
653 * Also, no need to ping if we got a response recently.
656 if (server->tcpStatus == CifsNeedReconnect ||
657 server->tcpStatus == CifsExiting ||
658 server->tcpStatus == CifsNew ||
659 (server->ops->can_echo && !server->ops->can_echo(server)) ||
660 time_before(jiffies, server->lstrp + echo_interval - HZ))
663 rc = server->ops->echo ? server->ops->echo(server) : -ENOSYS;
665 cifs_dbg(FYI, "Unable to send echo request to server: %s\n",
669 queue_delayed_work(cifsiod_wq, &server->echo, server->echo_interval);
673 allocate_buffers(struct TCP_Server_Info *server)
675 if (!server->bigbuf) {
676 server->bigbuf = (char *)cifs_buf_get();
677 if (!server->bigbuf) {
678 cifs_server_dbg(VFS, "No memory for large SMB response\n");
680 /* retry will check if exiting */
683 } else if (server->large_buf) {
684 /* we are reusing a dirty large buf, clear its start */
685 memset(server->bigbuf, 0, HEADER_SIZE(server));
688 if (!server->smallbuf) {
689 server->smallbuf = (char *)cifs_small_buf_get();
690 if (!server->smallbuf) {
691 cifs_server_dbg(VFS, "No memory for SMB response\n");
693 /* retry will check if exiting */
696 /* beginning of smb buffer is cleared in our buf_get */
698 /* if existing small buf clear beginning */
699 memset(server->smallbuf, 0, HEADER_SIZE(server));
706 server_unresponsive(struct TCP_Server_Info *server)
709 * We need to wait 3 echo intervals to make sure we handle such
711 * 1s client sends a normal SMB request
712 * 2s client gets a response
713 * 30s echo workqueue job pops, and decides we got a response recently
714 * and don't need to send another
716 * 65s kernel_recvmsg times out, and we see that we haven't gotten
717 * a response in >60s.
719 if ((server->tcpStatus == CifsGood ||
720 server->tcpStatus == CifsNeedNegotiate) &&
721 time_after(jiffies, server->lstrp + 3 * server->echo_interval)) {
722 cifs_server_dbg(VFS, "has not responded in %lu seconds. Reconnecting...\n",
723 (3 * server->echo_interval) / HZ);
724 cifs_reconnect(server);
732 zero_credits(struct TCP_Server_Info *server)
736 spin_lock(&server->req_lock);
737 val = server->credits + server->echo_credits + server->oplock_credits;
738 if (server->in_flight == 0 && val == 0) {
739 spin_unlock(&server->req_lock);
742 spin_unlock(&server->req_lock);
747 cifs_readv_from_socket(struct TCP_Server_Info *server, struct msghdr *smb_msg)
752 smb_msg->msg_control = NULL;
753 smb_msg->msg_controllen = 0;
755 for (total_read = 0; msg_data_left(smb_msg); total_read += length) {
758 /* reconnect if no credits and no requests in flight */
759 if (zero_credits(server)) {
760 cifs_reconnect(server);
761 return -ECONNABORTED;
764 if (server_unresponsive(server))
765 return -ECONNABORTED;
766 if (cifs_rdma_enabled(server) && server->smbd_conn)
767 length = smbd_recv(server->smbd_conn, smb_msg);
769 length = sock_recvmsg(server->ssocket, smb_msg, 0);
771 if (server->tcpStatus == CifsExiting)
774 if (server->tcpStatus == CifsNeedReconnect) {
775 cifs_reconnect(server);
776 return -ECONNABORTED;
779 if (length == -ERESTARTSYS ||
783 * Minimum sleep to prevent looping, allowing socket
784 * to clear and app threads to set tcpStatus
785 * CifsNeedReconnect if server hung.
787 usleep_range(1000, 2000);
793 cifs_dbg(FYI, "Received no data or error: %d\n", length);
794 cifs_reconnect(server);
795 return -ECONNABORTED;
802 cifs_read_from_socket(struct TCP_Server_Info *server, char *buf,
803 unsigned int to_read)
805 struct msghdr smb_msg;
806 struct kvec iov = {.iov_base = buf, .iov_len = to_read};
807 iov_iter_kvec(&smb_msg.msg_iter, READ, &iov, 1, to_read);
809 return cifs_readv_from_socket(server, &smb_msg);
813 cifs_read_page_from_socket(struct TCP_Server_Info *server, struct page *page,
814 unsigned int page_offset, unsigned int to_read)
816 struct msghdr smb_msg;
817 struct bio_vec bv = {
818 .bv_page = page, .bv_len = to_read, .bv_offset = page_offset};
819 iov_iter_bvec(&smb_msg.msg_iter, READ, &bv, 1, to_read);
820 return cifs_readv_from_socket(server, &smb_msg);
824 is_smb_response(struct TCP_Server_Info *server, unsigned char type)
827 * The first byte big endian of the length field,
828 * is actually not part of the length but the type
829 * with the most common, zero, as regular data.
832 case RFC1002_SESSION_MESSAGE:
833 /* Regular SMB response */
835 case RFC1002_SESSION_KEEP_ALIVE:
836 cifs_dbg(FYI, "RFC 1002 session keep alive\n");
838 case RFC1002_POSITIVE_SESSION_RESPONSE:
839 cifs_dbg(FYI, "RFC 1002 positive session response\n");
841 case RFC1002_NEGATIVE_SESSION_RESPONSE:
843 * We get this from Windows 98 instead of an error on
844 * SMB negprot response.
846 cifs_dbg(FYI, "RFC 1002 negative session response\n");
847 /* give server a second to clean up */
850 * Always try 445 first on reconnect since we get NACK
851 * on some if we ever connected to port 139 (the NACK
852 * is since we do not begin with RFC1001 session
855 cifs_set_port((struct sockaddr *)&server->dstaddr, CIFS_PORT);
856 cifs_reconnect(server);
859 cifs_server_dbg(VFS, "RFC 1002 unknown response type 0x%x\n", type);
860 cifs_reconnect(server);
867 dequeue_mid(struct mid_q_entry *mid, bool malformed)
869 #ifdef CONFIG_CIFS_STATS2
870 mid->when_received = jiffies;
872 spin_lock(&GlobalMid_Lock);
874 mid->mid_state = MID_RESPONSE_RECEIVED;
876 mid->mid_state = MID_RESPONSE_MALFORMED;
878 * Trying to handle/dequeue a mid after the send_recv()
879 * function has finished processing it is a bug.
881 if (mid->mid_flags & MID_DELETED)
882 printk_once(KERN_WARNING
883 "trying to dequeue a deleted mid\n");
885 list_del_init(&mid->qhead);
886 mid->mid_flags |= MID_DELETED;
888 spin_unlock(&GlobalMid_Lock);
892 smb2_get_credits_from_hdr(char *buffer, struct TCP_Server_Info *server)
894 struct smb2_sync_hdr *shdr = (struct smb2_sync_hdr *)buffer;
897 * SMB1 does not use credits.
899 if (server->vals->header_preamble_size)
902 return le16_to_cpu(shdr->CreditRequest);
906 handle_mid(struct mid_q_entry *mid, struct TCP_Server_Info *server,
907 char *buf, int malformed)
909 if (server->ops->check_trans2 &&
910 server->ops->check_trans2(mid, server, buf, malformed))
912 mid->credits_received = smb2_get_credits_from_hdr(buf, server);
914 mid->large_buf = server->large_buf;
915 /* Was previous buf put in mpx struct for multi-rsp? */
916 if (!mid->multiRsp) {
917 /* smb buffer will be freed by user thread */
918 if (server->large_buf)
919 server->bigbuf = NULL;
921 server->smallbuf = NULL;
923 dequeue_mid(mid, malformed);
926 static void clean_demultiplex_info(struct TCP_Server_Info *server)
930 /* take it off the list, if it's not already */
931 spin_lock(&cifs_tcp_ses_lock);
932 list_del_init(&server->tcp_ses_list);
933 spin_unlock(&cifs_tcp_ses_lock);
935 spin_lock(&GlobalMid_Lock);
936 server->tcpStatus = CifsExiting;
937 spin_unlock(&GlobalMid_Lock);
938 wake_up_all(&server->response_q);
940 /* check if we have blocked requests that need to free */
941 spin_lock(&server->req_lock);
942 if (server->credits <= 0)
944 spin_unlock(&server->req_lock);
946 * Although there should not be any requests blocked on this queue it
947 * can not hurt to be paranoid and try to wake up requests that may
948 * haven been blocked when more than 50 at time were on the wire to the
949 * same server - they now will see the session is in exit state and get
950 * out of SendReceive.
952 wake_up_all(&server->request_q);
953 /* give those requests time to exit */
955 if (cifs_rdma_enabled(server))
956 smbd_destroy(server);
957 if (server->ssocket) {
958 sock_release(server->ssocket);
959 server->ssocket = NULL;
962 if (!list_empty(&server->pending_mid_q)) {
963 struct list_head dispose_list;
964 struct mid_q_entry *mid_entry;
965 struct list_head *tmp, *tmp2;
967 INIT_LIST_HEAD(&dispose_list);
968 spin_lock(&GlobalMid_Lock);
969 list_for_each_safe(tmp, tmp2, &server->pending_mid_q) {
970 mid_entry = list_entry(tmp, struct mid_q_entry, qhead);
971 cifs_dbg(FYI, "Clearing mid 0x%llx\n", mid_entry->mid);
972 kref_get(&mid_entry->refcount);
973 mid_entry->mid_state = MID_SHUTDOWN;
974 list_move(&mid_entry->qhead, &dispose_list);
975 mid_entry->mid_flags |= MID_DELETED;
977 spin_unlock(&GlobalMid_Lock);
979 /* now walk dispose list and issue callbacks */
980 list_for_each_safe(tmp, tmp2, &dispose_list) {
981 mid_entry = list_entry(tmp, struct mid_q_entry, qhead);
982 cifs_dbg(FYI, "Callback mid 0x%llx\n", mid_entry->mid);
983 list_del_init(&mid_entry->qhead);
984 mid_entry->callback(mid_entry);
985 cifs_mid_q_entry_release(mid_entry);
987 /* 1/8th of sec is more than enough time for them to exit */
991 if (!list_empty(&server->pending_mid_q)) {
993 * mpx threads have not exited yet give them at least the smb
994 * send timeout time for long ops.
996 * Due to delays on oplock break requests, we need to wait at
997 * least 45 seconds before giving up on a request getting a
998 * response and going ahead and killing cifsd.
1000 cifs_dbg(FYI, "Wait for exit from demultiplex thread\n");
1003 * If threads still have not exited they are probably never
1004 * coming home not much else we can do but free the memory.
1008 kfree(server->hostname);
1011 length = atomic_dec_return(&tcpSesAllocCount);
1013 mempool_resize(cifs_req_poolp, length + cifs_min_rcv);
1017 standard_receive3(struct TCP_Server_Info *server, struct mid_q_entry *mid)
1020 char *buf = server->smallbuf;
1021 unsigned int pdu_length = server->pdu_size;
1023 /* make sure this will fit in a large buffer */
1024 if (pdu_length > CIFSMaxBufSize + MAX_HEADER_SIZE(server) -
1025 server->vals->header_preamble_size) {
1026 cifs_server_dbg(VFS, "SMB response too long (%u bytes)\n", pdu_length);
1027 cifs_reconnect(server);
1028 return -ECONNABORTED;
1031 /* switch to large buffer if too big for a small one */
1032 if (pdu_length > MAX_CIFS_SMALL_BUFFER_SIZE - 4) {
1033 server->large_buf = true;
1034 memcpy(server->bigbuf, buf, server->total_read);
1035 buf = server->bigbuf;
1038 /* now read the rest */
1039 length = cifs_read_from_socket(server, buf + HEADER_SIZE(server) - 1,
1040 pdu_length - HEADER_SIZE(server) + 1
1041 + server->vals->header_preamble_size);
1045 server->total_read += length;
1047 dump_smb(buf, server->total_read);
1049 return cifs_handle_standard(server, mid);
1053 cifs_handle_standard(struct TCP_Server_Info *server, struct mid_q_entry *mid)
1055 char *buf = server->large_buf ? server->bigbuf : server->smallbuf;
1059 * We know that we received enough to get to the MID as we
1060 * checked the pdu_length earlier. Now check to see
1061 * if the rest of the header is OK. We borrow the length
1062 * var for the rest of the loop to avoid a new stack var.
1064 * 48 bytes is enough to display the header and a little bit
1065 * into the payload for debugging purposes.
1067 length = server->ops->check_message(buf, server->total_read, server);
1069 cifs_dump_mem("Bad SMB: ", buf,
1070 min_t(unsigned int, server->total_read, 48));
1072 if (server->ops->is_session_expired &&
1073 server->ops->is_session_expired(buf)) {
1074 cifs_reconnect(server);
1078 if (server->ops->is_status_pending &&
1079 server->ops->is_status_pending(buf, server))
1085 handle_mid(mid, server, buf, length);
1090 smb2_add_credits_from_hdr(char *buffer, struct TCP_Server_Info *server)
1092 struct smb2_sync_hdr *shdr = (struct smb2_sync_hdr *)buffer;
1095 * SMB1 does not use credits.
1097 if (server->vals->header_preamble_size)
1100 if (shdr->CreditRequest) {
1101 spin_lock(&server->req_lock);
1102 server->credits += le16_to_cpu(shdr->CreditRequest);
1103 spin_unlock(&server->req_lock);
1104 wake_up(&server->request_q);
1110 cifs_demultiplex_thread(void *p)
1112 int i, num_mids, length;
1113 struct TCP_Server_Info *server = p;
1114 unsigned int pdu_length;
1115 unsigned int next_offset;
1117 struct task_struct *task_to_wake = NULL;
1118 struct mid_q_entry *mids[MAX_COMPOUND];
1119 char *bufs[MAX_COMPOUND];
1120 unsigned int noreclaim_flag;
1122 noreclaim_flag = memalloc_noreclaim_save();
1123 cifs_dbg(FYI, "Demultiplex PID: %d\n", task_pid_nr(current));
1125 length = atomic_inc_return(&tcpSesAllocCount);
1127 mempool_resize(cifs_req_poolp, length + cifs_min_rcv);
1130 allow_kernel_signal(SIGKILL);
1131 while (server->tcpStatus != CifsExiting) {
1132 if (try_to_freeze())
1135 if (!allocate_buffers(server))
1138 server->large_buf = false;
1139 buf = server->smallbuf;
1140 pdu_length = 4; /* enough to get RFC1001 header */
1142 length = cifs_read_from_socket(server, buf, pdu_length);
1146 if (server->vals->header_preamble_size == 0)
1147 server->total_read = 0;
1149 server->total_read = length;
1152 * The right amount was read from socket - 4 bytes,
1153 * so we can now interpret the length field.
1155 pdu_length = get_rfc1002_length(buf);
1157 cifs_dbg(FYI, "RFC1002 header 0x%x\n", pdu_length);
1158 if (!is_smb_response(server, buf[0]))
1161 server->pdu_size = pdu_length;
1163 /* make sure we have enough to get to the MID */
1164 if (server->pdu_size < HEADER_SIZE(server) - 1 -
1165 server->vals->header_preamble_size) {
1166 cifs_server_dbg(VFS, "SMB response too short (%u bytes)\n",
1168 cifs_reconnect(server);
1172 /* read down to the MID */
1173 length = cifs_read_from_socket(server,
1174 buf + server->vals->header_preamble_size,
1175 HEADER_SIZE(server) - 1
1176 - server->vals->header_preamble_size);
1179 server->total_read += length;
1181 if (server->ops->next_header) {
1182 next_offset = server->ops->next_header(buf);
1184 server->pdu_size = next_offset;
1187 memset(mids, 0, sizeof(mids));
1188 memset(bufs, 0, sizeof(bufs));
1191 if (server->ops->is_transform_hdr &&
1192 server->ops->receive_transform &&
1193 server->ops->is_transform_hdr(buf)) {
1194 length = server->ops->receive_transform(server,
1199 mids[0] = server->ops->find_mid(server, buf);
1203 if (!mids[0] || !mids[0]->receive)
1204 length = standard_receive3(server, mids[0]);
1206 length = mids[0]->receive(server, mids[0]);
1210 for (i = 0; i < num_mids; i++)
1212 cifs_mid_q_entry_release(mids[i]);
1216 server->lstrp = jiffies;
1218 for (i = 0; i < num_mids; i++) {
1219 if (mids[i] != NULL) {
1220 mids[i]->resp_buf_size = server->pdu_size;
1222 if (!mids[i]->multiRsp || mids[i]->multiEnd)
1223 mids[i]->callback(mids[i]);
1225 cifs_mid_q_entry_release(mids[i]);
1226 } else if (server->ops->is_oplock_break &&
1227 server->ops->is_oplock_break(bufs[i],
1229 smb2_add_credits_from_hdr(bufs[i], server);
1230 cifs_dbg(FYI, "Received oplock break\n");
1232 cifs_server_dbg(VFS, "No task to wake, unknown frame "
1233 "received! NumMids %d\n",
1234 atomic_read(&midCount));
1235 cifs_dump_mem("Received Data is: ", bufs[i],
1236 HEADER_SIZE(server));
1237 smb2_add_credits_from_hdr(bufs[i], server);
1238 #ifdef CONFIG_CIFS_DEBUG2
1239 if (server->ops->dump_detail)
1240 server->ops->dump_detail(bufs[i],
1242 cifs_dump_mids(server);
1243 #endif /* CIFS_DEBUG2 */
1247 if (pdu_length > server->pdu_size) {
1248 if (!allocate_buffers(server))
1250 pdu_length -= server->pdu_size;
1251 server->total_read = 0;
1252 server->large_buf = false;
1253 buf = server->smallbuf;
1256 } /* end while !EXITING */
1258 /* buffer usually freed in free_mid - need to free it here on exit */
1259 cifs_buf_release(server->bigbuf);
1260 if (server->smallbuf) /* no sense logging a debug message if NULL */
1261 cifs_small_buf_release(server->smallbuf);
1263 task_to_wake = xchg(&server->tsk, NULL);
1264 clean_demultiplex_info(server);
1266 /* if server->tsk was NULL then wait for a signal before exiting */
1267 if (!task_to_wake) {
1268 set_current_state(TASK_INTERRUPTIBLE);
1269 while (!signal_pending(current)) {
1271 set_current_state(TASK_INTERRUPTIBLE);
1273 set_current_state(TASK_RUNNING);
1276 memalloc_noreclaim_restore(noreclaim_flag);
1277 module_put_and_exit(0);
1280 /* extract the host portion of the UNC string */
1282 extract_hostname(const char *unc)
1288 /* skip double chars at beginning of string */
1289 /* BB: check validity of these bytes? */
1290 if (strlen(unc) < 3)
1291 return ERR_PTR(-EINVAL);
1292 for (src = unc; *src && *src == '\\'; src++)
1295 return ERR_PTR(-EINVAL);
1297 /* delimiter between hostname and sharename is always '\\' now */
1298 delim = strchr(src, '\\');
1300 return ERR_PTR(-EINVAL);
1303 dst = kmalloc((len + 1), GFP_KERNEL);
1305 return ERR_PTR(-ENOMEM);
1307 memcpy(dst, src, len);
1313 static int get_option_ul(substring_t args[], unsigned long *option)
1318 string = match_strdup(args);
1321 rc = kstrtoul(string, 0, option);
1327 static int get_option_uid(substring_t args[], kuid_t *result)
1329 unsigned long value;
1333 rc = get_option_ul(args, &value);
1337 uid = make_kuid(current_user_ns(), value);
1338 if (!uid_valid(uid))
1345 static int get_option_gid(substring_t args[], kgid_t *result)
1347 unsigned long value;
1351 rc = get_option_ul(args, &value);
1355 gid = make_kgid(current_user_ns(), value);
1356 if (!gid_valid(gid))
1363 static int cifs_parse_security_flavors(char *value,
1364 struct smb_vol *vol)
1367 substring_t args[MAX_OPT_ARGS];
1370 * With mount options, the last one should win. Reset any existing
1371 * settings back to default.
1373 vol->sectype = Unspecified;
1376 switch (match_token(value, cifs_secflavor_tokens, args)) {
1378 cifs_dbg(VFS, "sec=krb5p is not supported!\n");
1384 vol->sectype = Kerberos;
1386 case Opt_sec_ntlmsspi:
1389 case Opt_sec_ntlmssp:
1390 vol->sectype = RawNTLMSSP;
1396 vol->sectype = NTLM;
1398 case Opt_sec_ntlmv2i:
1401 case Opt_sec_ntlmv2:
1402 vol->sectype = NTLMv2;
1404 #ifdef CONFIG_CIFS_WEAK_PW_HASH
1405 case Opt_sec_lanman:
1406 vol->sectype = LANMAN;
1413 cifs_dbg(VFS, "bad security option: %s\n", value);
1421 cifs_parse_cache_flavor(char *value, struct smb_vol *vol)
1423 substring_t args[MAX_OPT_ARGS];
1425 switch (match_token(value, cifs_cacheflavor_tokens, args)) {
1426 case Opt_cache_loose:
1427 vol->direct_io = false;
1428 vol->strict_io = false;
1429 vol->cache_ro = false;
1430 vol->cache_rw = false;
1432 case Opt_cache_strict:
1433 vol->direct_io = false;
1434 vol->strict_io = true;
1435 vol->cache_ro = false;
1436 vol->cache_rw = false;
1438 case Opt_cache_none:
1439 vol->direct_io = true;
1440 vol->strict_io = false;
1441 vol->cache_ro = false;
1442 vol->cache_rw = false;
1445 vol->direct_io = false;
1446 vol->strict_io = false;
1447 vol->cache_ro = true;
1448 vol->cache_rw = false;
1451 vol->direct_io = false;
1452 vol->strict_io = false;
1453 vol->cache_ro = false;
1454 vol->cache_rw = true;
1457 cifs_dbg(VFS, "bad cache= option: %s\n", value);
1464 cifs_parse_smb_version(char *value, struct smb_vol *vol, bool is_smb3)
1466 substring_t args[MAX_OPT_ARGS];
1468 switch (match_token(value, cifs_smb_version_tokens, args)) {
1469 #ifdef CONFIG_CIFS_ALLOW_INSECURE_LEGACY
1471 if (disable_legacy_dialects) {
1472 cifs_dbg(VFS, "mount with legacy dialect disabled\n");
1476 cifs_dbg(VFS, "vers=1.0 (cifs) not permitted when mounting with smb3\n");
1479 cifs_dbg(VFS, "Use of the less secure dialect vers=1.0 "
1480 "is not recommended unless required for "
1481 "access to very old servers\n");
1482 vol->ops = &smb1_operations;
1483 vol->vals = &smb1_values;
1486 if (disable_legacy_dialects) {
1487 cifs_dbg(VFS, "mount with legacy dialect disabled\n");
1491 cifs_dbg(VFS, "vers=2.0 not permitted when mounting with smb3\n");
1494 vol->ops = &smb20_operations;
1495 vol->vals = &smb20_values;
1499 cifs_dbg(VFS, "vers=1.0 (cifs) mount not permitted when legacy dialects disabled\n");
1502 cifs_dbg(VFS, "vers=2.0 mount not permitted when legacy dialects disabled\n");
1504 #endif /* CIFS_ALLOW_INSECURE_LEGACY */
1506 vol->ops = &smb21_operations;
1507 vol->vals = &smb21_values;
1510 vol->ops = &smb30_operations;
1511 vol->vals = &smb30_values;
1514 vol->ops = &smb30_operations; /* currently identical with 3.0 */
1515 vol->vals = &smb302_values;
1518 vol->ops = &smb311_operations;
1519 vol->vals = &smb311_values;
1522 vol->ops = &smb30_operations; /* currently identical with 3.0 */
1523 vol->vals = &smb3any_values;
1526 vol->ops = &smb30_operations; /* currently identical with 3.0 */
1527 vol->vals = &smbdefault_values;
1530 cifs_dbg(VFS, "Unknown vers= option specified: %s\n", value);
1537 * Parse a devname into substrings and populate the vol->UNC and vol->prepath
1538 * fields with the result. Returns 0 on success and an error otherwise.
1541 cifs_parse_devname(const char *devname, struct smb_vol *vol)
1544 const char *delims = "/\\";
1547 if (unlikely(!devname || !*devname)) {
1548 cifs_dbg(VFS, "Device name not specified.\n");
1552 /* make sure we have a valid UNC double delimiter prefix */
1553 len = strspn(devname, delims);
1557 /* find delimiter between host and sharename */
1558 pos = strpbrk(devname + 2, delims);
1562 /* skip past delimiter */
1565 /* now go until next delimiter or end of string */
1566 len = strcspn(pos, delims);
1568 /* move "pos" up to delimiter or NULL */
1570 vol->UNC = kstrndup(devname, pos - devname, GFP_KERNEL);
1574 convert_delimiter(vol->UNC, '\\');
1576 /* skip any delimiter */
1577 if (*pos == '/' || *pos == '\\')
1580 /* If pos is NULL then no prepath */
1584 vol->prepath = kstrdup(pos, GFP_KERNEL);
1592 cifs_parse_mount_options(const char *mountdata, const char *devname,
1593 struct smb_vol *vol, bool is_smb3)
1596 char *mountdata_copy = NULL, *options;
1597 unsigned int temp_len, i, j;
1599 short int override_uid = -1;
1600 short int override_gid = -1;
1601 bool uid_specified = false;
1602 bool gid_specified = false;
1603 bool sloppy = false;
1604 char *invalid = NULL;
1605 char *nodename = utsname()->nodename;
1606 char *string = NULL;
1607 char *tmp_end, *value;
1609 bool got_ip = false;
1610 bool got_version = false;
1611 unsigned short port = 0;
1612 struct sockaddr *dstaddr = (struct sockaddr *)&vol->dstaddr;
1616 delim = separator[0];
1618 /* ensure we always start with zeroed-out smb_vol */
1619 memset(vol, 0, sizeof(*vol));
1622 * does not have to be perfect mapping since field is
1623 * informational, only used for servers that do not support
1624 * port 445 and it can be overridden at mount time
1626 memset(vol->source_rfc1001_name, 0x20, RFC1001_NAME_LEN);
1627 for (i = 0; i < strnlen(nodename, RFC1001_NAME_LEN); i++)
1628 vol->source_rfc1001_name[i] = toupper(nodename[i]);
1630 vol->source_rfc1001_name[RFC1001_NAME_LEN] = 0;
1631 /* null target name indicates to use *SMBSERVR default called name
1632 if we end up sending RFC1001 session initialize */
1633 vol->target_rfc1001_name[0] = 0;
1634 vol->cred_uid = current_uid();
1635 vol->linux_uid = current_uid();
1636 vol->linux_gid = current_gid();
1637 vol->bsize = 1024 * 1024; /* can improve cp performance significantly */
1639 * default to SFM style remapping of seven reserved characters
1640 * unless user overrides it or we negotiate CIFS POSIX where
1641 * it is unnecessary. Can not simultaneously use more than one mapping
1642 * since then readdir could list files that open could not open
1646 /* default to only allowing write access to owner of the mount */
1647 vol->dir_mode = vol->file_mode = S_IRUGO | S_IXUGO | S_IWUSR;
1649 /* vol->retry default is 0 (i.e. "soft" limited retry not hard retry) */
1650 /* default is always to request posix paths. */
1651 vol->posix_paths = 1;
1652 /* default to using server inode numbers where available */
1653 vol->server_ino = 1;
1655 /* default is to use strict cifs caching semantics */
1656 vol->strict_io = true;
1658 vol->actimeo = CIFS_DEF_ACTIMEO;
1660 /* Most clients set timeout to 0, allows server to use its default */
1661 vol->handle_timeout = 0; /* See MS-SMB2 spec section 2.2.14.2.12 */
1663 /* offer SMB2.1 and later (SMB3 etc). Secure and widely accepted */
1664 vol->ops = &smb30_operations;
1665 vol->vals = &smbdefault_values;
1667 vol->echo_interval = SMB_ECHO_INTERVAL_DEFAULT;
1669 /* default to no multichannel (single server connection) */
1670 vol->multichannel = false;
1671 vol->max_channels = 1;
1674 goto cifs_parse_mount_err;
1676 mountdata_copy = kstrndup(mountdata, PAGE_SIZE, GFP_KERNEL);
1677 if (!mountdata_copy)
1678 goto cifs_parse_mount_err;
1680 options = mountdata_copy;
1681 end = options + strlen(options);
1683 if (strncmp(options, "sep=", 4) == 0) {
1684 if (options[4] != 0) {
1685 separator[0] = options[4];
1688 cifs_dbg(FYI, "Null separator not allowed\n");
1691 vol->backupuid_specified = false; /* no backup intent for a user */
1692 vol->backupgid_specified = false; /* no backup intent for a group */
1694 switch (cifs_parse_devname(devname, vol)) {
1698 cifs_dbg(VFS, "Unable to allocate memory for devname.\n");
1699 goto cifs_parse_mount_err;
1701 cifs_dbg(VFS, "Malformed UNC in devname.\n");
1702 goto cifs_parse_mount_err;
1704 cifs_dbg(VFS, "Unknown error parsing devname.\n");
1705 goto cifs_parse_mount_err;
1708 while ((data = strsep(&options, separator)) != NULL) {
1709 substring_t args[MAX_OPT_ARGS];
1710 unsigned long option;
1716 token = match_token(data, cifs_mount_option_tokens, args);
1720 /* Ingnore the following */
1724 /* Boolean values */
1725 case Opt_user_xattr:
1728 case Opt_nouser_xattr:
1734 case Opt_noforceuid:
1740 case Opt_noforcegid:
1743 case Opt_noblocksend:
1744 vol->noblocksnd = 1;
1746 case Opt_noautotune:
1747 vol->noautotune = 1;
1765 vol->sfu_remap = true;
1766 vol->remap = false; /* disable SFM mapping */
1768 case Opt_nomapchars:
1769 vol->sfu_remap = false;
1773 vol->sfu_remap = false; /* disable SFU mapping */
1775 case Opt_nomapposix:
1788 #ifdef CONFIG_CIFS_ROOT
1792 case Opt_posixpaths:
1793 vol->posix_paths = 1;
1795 case Opt_noposixpaths:
1796 vol->posix_paths = 0;
1801 "conflicting unix mount options\n");
1802 vol->no_linux_ext = 1;
1805 if (vol->no_linux_ext)
1807 "conflicting unix mount options\n");
1819 * turn off mandatory locking in mode
1820 * if remote locking is turned off since the
1821 * local vfs will do advisory
1823 if (vol->file_mode ==
1824 (S_IALLUGO & ~(S_ISUID | S_IXGRP)))
1825 vol->file_mode = S_IALLUGO;
1827 case Opt_nohandlecache:
1828 vol->nohandlecache = 1;
1830 case Opt_handlecache:
1831 vol->nohandlecache = 0;
1833 case Opt_forcemandatorylock:
1842 case Opt_setuidfromacl:
1843 vol->setuidfromacl = 1;
1846 vol->dynperm = true;
1849 vol->dynperm = false;
1863 case Opt_nostrictsync:
1864 vol->nostrictsync = 1;
1866 case Opt_strictsync:
1867 vol->nostrictsync = 0;
1870 vol->server_ino = 1;
1872 case Opt_noserverino:
1873 vol->server_ino = 0;
1875 case Opt_rwpidforward:
1876 vol->rwpidforward = 1;
1888 vol->no_psx_acl = 0;
1891 vol->no_psx_acl = 1;
1893 case Opt_locallease:
1894 vol->local_lease = 1;
1899 case Opt_ignore_signature:
1901 vol->ignore_signature = true;
1904 /* we do not do the following in secFlags because seal
1905 * is a per tree connection (mount) not a per socket
1906 * or per-smb connection option in the protocol
1907 * vol->secFlg |= CIFSSEC_MUST_SEAL;
1912 pr_warn("CIFS: Mount option noac not supported. Instead set /proc/fs/cifs/LookupCacheEnabled to 0\n");
1915 #ifndef CONFIG_CIFS_FSCACHE
1916 cifs_dbg(VFS, "FS-Cache support needs CONFIG_CIFS_FSCACHE kernel config option set\n");
1917 goto cifs_parse_mount_err;
1921 case Opt_mfsymlinks:
1922 vol->mfsymlinks = true;
1925 vol->multiuser = true;
1930 case Opt_nosharesock:
1931 vol->nosharesock = true;
1933 case Opt_nopersistent:
1934 vol->nopersistent = true;
1935 if (vol->persistent) {
1937 "persistenthandles mount options conflict\n");
1938 goto cifs_parse_mount_err;
1941 case Opt_persistent:
1942 vol->persistent = true;
1943 if ((vol->nopersistent) || (vol->resilient)) {
1945 "persistenthandles mount options conflict\n");
1946 goto cifs_parse_mount_err;
1950 vol->resilient = true;
1951 if (vol->persistent) {
1953 "persistenthandles mount options conflict\n");
1954 goto cifs_parse_mount_err;
1957 case Opt_noresilient:
1958 vol->resilient = false; /* already the default */
1960 case Opt_domainauto:
1961 vol->domainauto = true;
1966 case Opt_multichannel:
1967 vol->multichannel = true;
1969 case Opt_nomultichannel:
1970 vol->multichannel = false;
1973 vol->compression = UNKNOWN_TYPE;
1975 "SMB3 compression support is experimental\n");
1978 /* Numeric Values */
1980 if (get_option_uid(args, &vol->backupuid)) {
1981 cifs_dbg(VFS, "%s: Invalid backupuid value\n",
1983 goto cifs_parse_mount_err;
1985 vol->backupuid_specified = true;
1988 if (get_option_gid(args, &vol->backupgid)) {
1989 cifs_dbg(VFS, "%s: Invalid backupgid value\n",
1991 goto cifs_parse_mount_err;
1993 vol->backupgid_specified = true;
1996 if (get_option_uid(args, &vol->linux_uid)) {
1997 cifs_dbg(VFS, "%s: Invalid uid value\n",
1999 goto cifs_parse_mount_err;
2001 uid_specified = true;
2004 if (get_option_uid(args, &vol->cred_uid)) {
2005 cifs_dbg(VFS, "%s: Invalid cruid value\n",
2007 goto cifs_parse_mount_err;
2011 if (get_option_gid(args, &vol->linux_gid)) {
2012 cifs_dbg(VFS, "%s: Invalid gid value\n",
2014 goto cifs_parse_mount_err;
2016 gid_specified = true;
2019 if (get_option_ul(args, &option)) {
2020 cifs_dbg(VFS, "%s: Invalid file_mode value\n",
2022 goto cifs_parse_mount_err;
2024 vol->file_mode = option;
2027 if (get_option_ul(args, &option)) {
2028 cifs_dbg(VFS, "%s: Invalid dir_mode value\n",
2030 goto cifs_parse_mount_err;
2032 vol->dir_mode = option;
2035 if (get_option_ul(args, &option) ||
2036 option > USHRT_MAX) {
2037 cifs_dbg(VFS, "%s: Invalid port value\n",
2039 goto cifs_parse_mount_err;
2041 port = (unsigned short)option;
2043 case Opt_min_enc_offload:
2044 if (get_option_ul(args, &option)) {
2045 cifs_dbg(VFS, "Invalid minimum encrypted read offload size (esize)\n");
2046 goto cifs_parse_mount_err;
2048 vol->min_offload = option;
2051 if (get_option_ul(args, &option)) {
2052 cifs_dbg(VFS, "%s: Invalid blocksize value\n",
2054 goto cifs_parse_mount_err;
2057 * inode blocksize realistically should never need to be
2058 * less than 16K or greater than 16M and default is 1MB.
2059 * Note that small inode block sizes (e.g. 64K) can lead
2060 * to very poor performance of common tools like cp and scp
2062 if ((option < CIFS_MAX_MSGSIZE) ||
2063 (option > (4 * SMB3_DEFAULT_IOSIZE))) {
2064 cifs_dbg(VFS, "%s: Invalid blocksize\n",
2066 goto cifs_parse_mount_err;
2068 vol->bsize = option;
2071 if (get_option_ul(args, &option)) {
2072 cifs_dbg(VFS, "%s: Invalid rsize value\n",
2074 goto cifs_parse_mount_err;
2076 vol->rsize = option;
2079 if (get_option_ul(args, &option)) {
2080 cifs_dbg(VFS, "%s: Invalid wsize value\n",
2082 goto cifs_parse_mount_err;
2084 vol->wsize = option;
2087 if (get_option_ul(args, &option)) {
2088 cifs_dbg(VFS, "%s: Invalid actimeo value\n",
2090 goto cifs_parse_mount_err;
2092 vol->actimeo = HZ * option;
2093 if (vol->actimeo > CIFS_MAX_ACTIMEO) {
2094 cifs_dbg(VFS, "attribute cache timeout too large\n");
2095 goto cifs_parse_mount_err;
2098 case Opt_handletimeout:
2099 if (get_option_ul(args, &option)) {
2100 cifs_dbg(VFS, "%s: Invalid handletimeout value\n",
2102 goto cifs_parse_mount_err;
2104 vol->handle_timeout = option;
2105 if (vol->handle_timeout > SMB3_MAX_HANDLE_TIMEOUT) {
2106 cifs_dbg(VFS, "Invalid handle cache timeout, longer than 16 minutes\n");
2107 goto cifs_parse_mount_err;
2110 case Opt_echo_interval:
2111 if (get_option_ul(args, &option)) {
2112 cifs_dbg(VFS, "%s: Invalid echo interval value\n",
2114 goto cifs_parse_mount_err;
2116 vol->echo_interval = option;
2119 if (get_option_ul(args, &option)) {
2120 cifs_dbg(VFS, "%s: Invalid snapshot time\n",
2122 goto cifs_parse_mount_err;
2124 vol->snapshot_time = option;
2126 case Opt_max_credits:
2127 if (get_option_ul(args, &option) || (option < 20) ||
2129 cifs_dbg(VFS, "%s: Invalid max_credits value\n",
2131 goto cifs_parse_mount_err;
2133 vol->max_credits = option;
2135 case Opt_max_channels:
2136 if (get_option_ul(args, &option) || option < 1 ||
2137 option > CIFS_MAX_CHANNELS) {
2138 cifs_dbg(VFS, "%s: Invalid max_channels value, needs to be 1-%d\n",
2139 __func__, CIFS_MAX_CHANNELS);
2140 goto cifs_parse_mount_err;
2142 vol->max_channels = option;
2145 /* String Arguments */
2147 case Opt_blank_user:
2148 /* null user, ie. anonymous authentication */
2150 vol->username = NULL;
2153 string = match_strdup(args);
2157 if (strnlen(string, CIFS_MAX_USERNAME_LEN) >
2158 CIFS_MAX_USERNAME_LEN) {
2159 pr_warn("CIFS: username too long\n");
2160 goto cifs_parse_mount_err;
2163 kfree(vol->username);
2164 vol->username = kstrdup(string, GFP_KERNEL);
2166 goto cifs_parse_mount_err;
2168 case Opt_blank_pass:
2169 /* passwords have to be handled differently
2170 * to allow the character used for deliminator
2171 * to be passed within them
2175 * Check if this is a case where the password
2176 * starts with a delimiter
2178 tmp_end = strchr(data, '=');
2180 if (!(tmp_end < end && tmp_end[1] == delim)) {
2181 /* No it is not. Set the password to NULL */
2182 kzfree(vol->password);
2183 vol->password = NULL;
2186 /* Fallthrough - to Opt_pass below.*/
2188 /* Obtain the value string */
2189 value = strchr(data, '=');
2192 /* Set tmp_end to end of the string */
2193 tmp_end = (char *) value + strlen(value);
2195 /* Check if following character is the deliminator
2196 * If yes, we have encountered a double deliminator
2197 * reset the NULL character to the deliminator
2199 if (tmp_end < end && tmp_end[1] == delim) {
2202 /* Keep iterating until we get to a single
2203 * deliminator OR the end
2205 while ((tmp_end = strchr(tmp_end, delim))
2206 != NULL && (tmp_end[1] == delim)) {
2207 tmp_end = (char *) &tmp_end[2];
2210 /* Reset var options to point to next element */
2213 options = (char *) &tmp_end[1];
2215 /* Reached the end of the mount option
2220 kzfree(vol->password);
2221 /* Now build new password string */
2222 temp_len = strlen(value);
2223 vol->password = kzalloc(temp_len+1, GFP_KERNEL);
2224 if (vol->password == NULL) {
2225 pr_warn("CIFS: no memory for password\n");
2226 goto cifs_parse_mount_err;
2229 for (i = 0, j = 0; i < temp_len; i++, j++) {
2230 vol->password[j] = value[i];
2231 if ((value[i] == delim) &&
2232 value[i+1] == delim)
2233 /* skip the second deliminator */
2236 vol->password[j] = '\0';
2239 /* FIXME: should this be an error instead? */
2243 string = match_strdup(args);
2247 if (!cifs_convert_address(dstaddr, string,
2249 pr_err("CIFS: bad ip= option (%s).\n", string);
2250 goto cifs_parse_mount_err;
2255 string = match_strdup(args);
2259 if (strnlen(string, CIFS_MAX_DOMAINNAME_LEN)
2260 == CIFS_MAX_DOMAINNAME_LEN) {
2261 pr_warn("CIFS: domain name too long\n");
2262 goto cifs_parse_mount_err;
2265 kfree(vol->domainname);
2266 vol->domainname = kstrdup(string, GFP_KERNEL);
2267 if (!vol->domainname) {
2268 pr_warn("CIFS: no memory for domainname\n");
2269 goto cifs_parse_mount_err;
2271 cifs_dbg(FYI, "Domain name set\n");
2274 string = match_strdup(args);
2278 if (!cifs_convert_address(
2279 (struct sockaddr *)&vol->srcaddr,
2280 string, strlen(string))) {
2281 pr_warn("CIFS: Could not parse srcaddr: %s\n",
2283 goto cifs_parse_mount_err;
2287 string = match_strdup(args);
2291 if (strnlen(string, 1024) >= 65) {
2292 pr_warn("CIFS: iocharset name too long.\n");
2293 goto cifs_parse_mount_err;
2296 if (strncasecmp(string, "default", 7) != 0) {
2297 kfree(vol->iocharset);
2298 vol->iocharset = kstrdup(string,
2300 if (!vol->iocharset) {
2301 pr_warn("CIFS: no memory for charset\n");
2302 goto cifs_parse_mount_err;
2305 /* if iocharset not set then load_nls_default
2308 cifs_dbg(FYI, "iocharset set to %s\n", string);
2310 case Opt_netbiosname:
2311 string = match_strdup(args);
2315 memset(vol->source_rfc1001_name, 0x20,
2318 * FIXME: are there cases in which a comma can
2319 * be valid in workstation netbios name (and
2320 * need special handling)?
2322 for (i = 0; i < RFC1001_NAME_LEN; i++) {
2323 /* don't ucase netbiosname for user */
2326 vol->source_rfc1001_name[i] = string[i];
2328 /* The string has 16th byte zero still from
2329 * set at top of the function
2331 if (i == RFC1001_NAME_LEN && string[i] != 0)
2332 pr_warn("CIFS: netbiosname longer than 15 truncated.\n");
2335 /* servernetbiosname specified override *SMBSERVER */
2336 string = match_strdup(args);
2340 /* last byte, type, is 0x20 for servr type */
2341 memset(vol->target_rfc1001_name, 0x20,
2342 RFC1001_NAME_LEN_WITH_NULL);
2344 /* BB are there cases in which a comma can be
2345 valid in this workstation netbios name
2346 (and need special handling)? */
2348 /* user or mount helper must uppercase the
2350 for (i = 0; i < 15; i++) {
2353 vol->target_rfc1001_name[i] = string[i];
2355 /* The string has 16th byte zero still from
2356 set at top of the function */
2357 if (i == RFC1001_NAME_LEN && string[i] != 0)
2358 pr_warn("CIFS: server netbiosname longer than 15 truncated.\n");
2361 /* version of mount userspace tools, not dialect */
2362 string = match_strdup(args);
2366 /* If interface changes in mount.cifs bump to new ver */
2367 if (strncasecmp(string, "1", 1) == 0) {
2368 if (strlen(string) > 1) {
2369 pr_warn("Bad mount helper ver=%s. Did "
2370 "you want SMB1 (CIFS) dialect "
2371 "and mean to type vers=1.0 "
2372 "instead?\n", string);
2373 goto cifs_parse_mount_err;
2375 /* This is the default */
2378 /* For all other value, error */
2379 pr_warn("CIFS: Invalid mount helper version specified\n");
2380 goto cifs_parse_mount_err;
2382 /* protocol version (dialect) */
2383 string = match_strdup(args);
2387 if (cifs_parse_smb_version(string, vol, is_smb3) != 0)
2388 goto cifs_parse_mount_err;
2392 string = match_strdup(args);
2396 if (cifs_parse_security_flavors(string, vol) != 0)
2397 goto cifs_parse_mount_err;
2400 string = match_strdup(args);
2404 if (cifs_parse_cache_flavor(string, vol) != 0)
2405 goto cifs_parse_mount_err;
2409 * An option we don't recognize. Save it off for later
2410 * if we haven't already found one
2416 /* Free up any allocated string */
2421 if (!sloppy && invalid) {
2422 pr_err("CIFS: Unknown mount option \"%s\"\n", invalid);
2423 goto cifs_parse_mount_err;
2426 if (vol->rdma && vol->vals->protocol_id < SMB30_PROT_ID) {
2427 cifs_dbg(VFS, "SMB Direct requires Version >=3.0\n");
2428 goto cifs_parse_mount_err;
2432 /* Muliuser mounts require CONFIG_KEYS support */
2433 if (vol->multiuser) {
2434 cifs_dbg(VFS, "Multiuser mounts require kernels with CONFIG_KEYS enabled\n");
2435 goto cifs_parse_mount_err;
2439 cifs_dbg(VFS, "CIFS mount error: No usable UNC path provided in device string!\n");
2440 goto cifs_parse_mount_err;
2443 /* make sure UNC has a share name */
2444 if (!strchr(vol->UNC + 3, '\\')) {
2445 cifs_dbg(VFS, "Malformed UNC. Unable to find share name.\n");
2446 goto cifs_parse_mount_err;
2453 /* No ip= option specified? Try to get it from UNC */
2454 /* Use the address part of the UNC. */
2455 slash = strchr(&vol->UNC[2], '\\');
2456 len = slash - &vol->UNC[2];
2457 if (!cifs_convert_address(dstaddr, &vol->UNC[2], len)) {
2458 pr_err("Unable to determine destination address.\n");
2459 goto cifs_parse_mount_err;
2463 /* set the port that we got earlier */
2464 cifs_set_port(dstaddr, port);
2467 vol->override_uid = override_uid;
2468 else if (override_uid == 1)
2469 pr_notice("CIFS: ignoring forceuid mount option specified with no uid= option.\n");
2472 vol->override_gid = override_gid;
2473 else if (override_gid == 1)
2474 pr_notice("CIFS: ignoring forcegid mount option specified with no gid= option.\n");
2476 if (got_version == false)
2477 pr_warn_once("No dialect specified on mount. Default has changed"
2478 " to a more secure dialect, SMB2.1 or later (e.g. "
2479 "SMB3.1.1), from CIFS (SMB1). To use the less secure "
2480 "SMB1 dialect to access old servers which do not "
2481 "support SMB3.1.1 (or even SMB3 or SMB2.1) specify "
2482 "vers=1.0 on mount.\n");
2484 kfree(mountdata_copy);
2488 pr_warn("Could not allocate temporary buffer\n");
2489 cifs_parse_mount_err:
2491 kfree(mountdata_copy);
2495 /** Returns true if srcaddr isn't specified and rhs isn't
2496 * specified, or if srcaddr is specified and
2497 * matches the IP address of the rhs argument.
2500 srcip_matches(struct sockaddr *srcaddr, struct sockaddr *rhs)
2502 switch (srcaddr->sa_family) {
2504 return (rhs->sa_family == AF_UNSPEC);
2506 struct sockaddr_in *saddr4 = (struct sockaddr_in *)srcaddr;
2507 struct sockaddr_in *vaddr4 = (struct sockaddr_in *)rhs;
2508 return (saddr4->sin_addr.s_addr == vaddr4->sin_addr.s_addr);
2511 struct sockaddr_in6 *saddr6 = (struct sockaddr_in6 *)srcaddr;
2512 struct sockaddr_in6 *vaddr6 = (struct sockaddr_in6 *)rhs;
2513 return ipv6_addr_equal(&saddr6->sin6_addr, &vaddr6->sin6_addr);
2517 return false; /* don't expect to be here */
2522 * If no port is specified in addr structure, we try to match with 445 port
2523 * and if it fails - with 139 ports. It should be called only if address
2524 * families of server and addr are equal.
2527 match_port(struct TCP_Server_Info *server, struct sockaddr *addr)
2529 __be16 port, *sport;
2531 /* SMBDirect manages its own ports, don't match it here */
2535 switch (addr->sa_family) {
2537 sport = &((struct sockaddr_in *) &server->dstaddr)->sin_port;
2538 port = ((struct sockaddr_in *) addr)->sin_port;
2541 sport = &((struct sockaddr_in6 *) &server->dstaddr)->sin6_port;
2542 port = ((struct sockaddr_in6 *) addr)->sin6_port;
2550 port = htons(CIFS_PORT);
2554 port = htons(RFC1001_PORT);
2557 return port == *sport;
2561 match_address(struct TCP_Server_Info *server, struct sockaddr *addr,
2562 struct sockaddr *srcaddr)
2564 switch (addr->sa_family) {
2566 struct sockaddr_in *addr4 = (struct sockaddr_in *)addr;
2567 struct sockaddr_in *srv_addr4 =
2568 (struct sockaddr_in *)&server->dstaddr;
2570 if (addr4->sin_addr.s_addr != srv_addr4->sin_addr.s_addr)
2575 struct sockaddr_in6 *addr6 = (struct sockaddr_in6 *)addr;
2576 struct sockaddr_in6 *srv_addr6 =
2577 (struct sockaddr_in6 *)&server->dstaddr;
2579 if (!ipv6_addr_equal(&addr6->sin6_addr,
2580 &srv_addr6->sin6_addr))
2582 if (addr6->sin6_scope_id != srv_addr6->sin6_scope_id)
2588 return false; /* don't expect to be here */
2591 if (!srcip_matches(srcaddr, (struct sockaddr *)&server->srcaddr))
2598 match_security(struct TCP_Server_Info *server, struct smb_vol *vol)
2601 * The select_sectype function should either return the vol->sectype
2602 * that was specified, or "Unspecified" if that sectype was not
2603 * compatible with the given NEGOTIATE request.
2605 if (server->ops->select_sectype(server, vol->sectype)
2610 * Now check if signing mode is acceptable. No need to check
2611 * global_secflags at this point since if MUST_SIGN is set then
2612 * the server->sign had better be too.
2614 if (vol->sign && !server->sign)
2620 static int match_server(struct TCP_Server_Info *server, struct smb_vol *vol)
2622 struct sockaddr *addr = (struct sockaddr *)&vol->dstaddr;
2624 if (vol->nosharesock)
2627 /* If multidialect negotiation see if existing sessions match one */
2628 if (strcmp(vol->vals->version_string, SMB3ANY_VERSION_STRING) == 0) {
2629 if (server->vals->protocol_id < SMB30_PROT_ID)
2631 } else if (strcmp(vol->vals->version_string,
2632 SMBDEFAULT_VERSION_STRING) == 0) {
2633 if (server->vals->protocol_id < SMB21_PROT_ID)
2635 } else if ((server->vals != vol->vals) || (server->ops != vol->ops))
2638 if (!net_eq(cifs_net_ns(server), current->nsproxy->net_ns))
2641 if (!match_address(server, addr,
2642 (struct sockaddr *)&vol->srcaddr))
2645 if (!match_port(server, addr))
2648 if (!match_security(server, vol))
2651 if (server->echo_interval != vol->echo_interval * HZ)
2654 if (server->rdma != vol->rdma)
2657 if (server->ignore_signature != vol->ignore_signature)
2660 if (server->min_offload != vol->min_offload)
2666 struct TCP_Server_Info *
2667 cifs_find_tcp_session(struct smb_vol *vol)
2669 struct TCP_Server_Info *server;
2671 spin_lock(&cifs_tcp_ses_lock);
2672 list_for_each_entry(server, &cifs_tcp_ses_list, tcp_ses_list) {
2674 * Skip ses channels since they're only handled in lower layers
2675 * (e.g. cifs_send_recv).
2677 if (server->is_channel || !match_server(server, vol))
2680 ++server->srv_count;
2681 spin_unlock(&cifs_tcp_ses_lock);
2682 cifs_dbg(FYI, "Existing tcp session with server found\n");
2685 spin_unlock(&cifs_tcp_ses_lock);
2690 cifs_put_tcp_session(struct TCP_Server_Info *server, int from_reconnect)
2692 struct task_struct *task;
2694 spin_lock(&cifs_tcp_ses_lock);
2695 if (--server->srv_count > 0) {
2696 spin_unlock(&cifs_tcp_ses_lock);
2700 put_net(cifs_net_ns(server));
2702 list_del_init(&server->tcp_ses_list);
2703 spin_unlock(&cifs_tcp_ses_lock);
2705 cancel_delayed_work_sync(&server->echo);
2709 * Avoid deadlock here: reconnect work calls
2710 * cifs_put_tcp_session() at its end. Need to be sure
2711 * that reconnect work does nothing with server pointer after
2714 cancel_delayed_work(&server->reconnect);
2716 cancel_delayed_work_sync(&server->reconnect);
2718 spin_lock(&GlobalMid_Lock);
2719 server->tcpStatus = CifsExiting;
2720 spin_unlock(&GlobalMid_Lock);
2722 cifs_crypto_secmech_release(server);
2723 cifs_fscache_release_client_cookie(server);
2725 kfree(server->session_key.response);
2726 server->session_key.response = NULL;
2727 server->session_key.len = 0;
2729 task = xchg(&server->tsk, NULL);
2731 send_sig(SIGKILL, task, 1);
2734 struct TCP_Server_Info *
2735 cifs_get_tcp_session(struct smb_vol *volume_info)
2737 struct TCP_Server_Info *tcp_ses = NULL;
2740 cifs_dbg(FYI, "UNC: %s\n", volume_info->UNC);
2742 /* see if we already have a matching tcp_ses */
2743 tcp_ses = cifs_find_tcp_session(volume_info);
2747 tcp_ses = kzalloc(sizeof(struct TCP_Server_Info), GFP_KERNEL);
2753 tcp_ses->ops = volume_info->ops;
2754 tcp_ses->vals = volume_info->vals;
2755 cifs_set_net_ns(tcp_ses, get_net(current->nsproxy->net_ns));
2756 tcp_ses->hostname = extract_hostname(volume_info->UNC);
2757 if (IS_ERR(tcp_ses->hostname)) {
2758 rc = PTR_ERR(tcp_ses->hostname);
2759 goto out_err_crypto_release;
2762 tcp_ses->noblockcnt = volume_info->rootfs;
2763 tcp_ses->noblocksnd = volume_info->noblocksnd || volume_info->rootfs;
2764 tcp_ses->noautotune = volume_info->noautotune;
2765 tcp_ses->tcp_nodelay = volume_info->sockopt_tcp_nodelay;
2766 tcp_ses->rdma = volume_info->rdma;
2767 tcp_ses->in_flight = 0;
2768 tcp_ses->max_in_flight = 0;
2769 tcp_ses->credits = 1;
2770 init_waitqueue_head(&tcp_ses->response_q);
2771 init_waitqueue_head(&tcp_ses->request_q);
2772 INIT_LIST_HEAD(&tcp_ses->pending_mid_q);
2773 mutex_init(&tcp_ses->srv_mutex);
2774 memcpy(tcp_ses->workstation_RFC1001_name,
2775 volume_info->source_rfc1001_name, RFC1001_NAME_LEN_WITH_NULL);
2776 memcpy(tcp_ses->server_RFC1001_name,
2777 volume_info->target_rfc1001_name, RFC1001_NAME_LEN_WITH_NULL);
2778 tcp_ses->session_estab = false;
2779 tcp_ses->sequence_number = 0;
2780 tcp_ses->reconnect_instance = 1;
2781 tcp_ses->lstrp = jiffies;
2782 tcp_ses->compress_algorithm = cpu_to_le16(volume_info->compression);
2783 spin_lock_init(&tcp_ses->req_lock);
2784 INIT_LIST_HEAD(&tcp_ses->tcp_ses_list);
2785 INIT_LIST_HEAD(&tcp_ses->smb_ses_list);
2786 INIT_DELAYED_WORK(&tcp_ses->echo, cifs_echo_request);
2787 INIT_DELAYED_WORK(&tcp_ses->reconnect, smb2_reconnect_server);
2788 mutex_init(&tcp_ses->reconnect_mutex);
2789 memcpy(&tcp_ses->srcaddr, &volume_info->srcaddr,
2790 sizeof(tcp_ses->srcaddr));
2791 memcpy(&tcp_ses->dstaddr, &volume_info->dstaddr,
2792 sizeof(tcp_ses->dstaddr));
2793 if (volume_info->use_client_guid)
2794 memcpy(tcp_ses->client_guid, volume_info->client_guid,
2795 SMB2_CLIENT_GUID_SIZE);
2797 generate_random_uuid(tcp_ses->client_guid);
2799 * at this point we are the only ones with the pointer
2800 * to the struct since the kernel thread not created yet
2801 * no need to spinlock this init of tcpStatus or srv_count
2803 tcp_ses->tcpStatus = CifsNew;
2804 ++tcp_ses->srv_count;
2806 if (volume_info->echo_interval >= SMB_ECHO_INTERVAL_MIN &&
2807 volume_info->echo_interval <= SMB_ECHO_INTERVAL_MAX)
2808 tcp_ses->echo_interval = volume_info->echo_interval * HZ;
2810 tcp_ses->echo_interval = SMB_ECHO_INTERVAL_DEFAULT * HZ;
2811 if (tcp_ses->rdma) {
2812 #ifndef CONFIG_CIFS_SMB_DIRECT
2813 cifs_dbg(VFS, "CONFIG_CIFS_SMB_DIRECT is not enabled\n");
2815 goto out_err_crypto_release;
2817 tcp_ses->smbd_conn = smbd_get_connection(
2818 tcp_ses, (struct sockaddr *)&volume_info->dstaddr);
2819 if (tcp_ses->smbd_conn) {
2820 cifs_dbg(VFS, "RDMA transport established\n");
2822 goto smbd_connected;
2825 goto out_err_crypto_release;
2828 rc = ip_connect(tcp_ses);
2830 cifs_dbg(VFS, "Error connecting to socket. Aborting operation.\n");
2831 goto out_err_crypto_release;
2835 * since we're in a cifs function already, we know that
2836 * this will succeed. No need for try_module_get().
2838 __module_get(THIS_MODULE);
2839 tcp_ses->tsk = kthread_run(cifs_demultiplex_thread,
2841 if (IS_ERR(tcp_ses->tsk)) {
2842 rc = PTR_ERR(tcp_ses->tsk);
2843 cifs_dbg(VFS, "error %d create cifsd thread\n", rc);
2844 module_put(THIS_MODULE);
2845 goto out_err_crypto_release;
2847 tcp_ses->min_offload = volume_info->min_offload;
2848 tcp_ses->tcpStatus = CifsNeedNegotiate;
2850 tcp_ses->nr_targets = 1;
2851 tcp_ses->ignore_signature = volume_info->ignore_signature;
2852 /* thread spawned, put it on the list */
2853 spin_lock(&cifs_tcp_ses_lock);
2854 list_add(&tcp_ses->tcp_ses_list, &cifs_tcp_ses_list);
2855 spin_unlock(&cifs_tcp_ses_lock);
2857 cifs_fscache_get_client_cookie(tcp_ses);
2859 /* queue echo request delayed work */
2860 queue_delayed_work(cifsiod_wq, &tcp_ses->echo, tcp_ses->echo_interval);
2864 out_err_crypto_release:
2865 cifs_crypto_secmech_release(tcp_ses);
2867 put_net(cifs_net_ns(tcp_ses));
2871 if (!IS_ERR(tcp_ses->hostname))
2872 kfree(tcp_ses->hostname);
2873 if (tcp_ses->ssocket)
2874 sock_release(tcp_ses->ssocket);
2880 static int match_session(struct cifs_ses *ses, struct smb_vol *vol)
2882 if (vol->sectype != Unspecified &&
2883 vol->sectype != ses->sectype)
2887 * If an existing session is limited to less channels than
2888 * requested, it should not be reused
2890 if (ses->chan_max < vol->max_channels)
2893 switch (ses->sectype) {
2895 if (!uid_eq(vol->cred_uid, ses->cred_uid))
2899 /* NULL username means anonymous session */
2900 if (ses->user_name == NULL) {
2906 /* anything else takes username/password */
2907 if (strncmp(ses->user_name,
2908 vol->username ? vol->username : "",
2909 CIFS_MAX_USERNAME_LEN))
2911 if ((vol->username && strlen(vol->username) != 0) &&
2912 ses->password != NULL &&
2913 strncmp(ses->password,
2914 vol->password ? vol->password : "",
2915 CIFS_MAX_PASSWORD_LEN))
2922 * cifs_setup_ipc - helper to setup the IPC tcon for the session
2924 * A new IPC connection is made and stored in the session
2925 * tcon_ipc. The IPC tcon has the same lifetime as the session.
2928 cifs_setup_ipc(struct cifs_ses *ses, struct smb_vol *volume_info)
2931 struct cifs_tcon *tcon;
2932 struct nls_table *nls_codepage;
2933 char unc[SERVER_NAME_LENGTH + sizeof("//x/IPC$")] = {0};
2935 struct TCP_Server_Info *server = ses->server;
2938 * If the mount request that resulted in the creation of the
2939 * session requires encryption, force IPC to be encrypted too.
2941 if (volume_info->seal) {
2942 if (server->capabilities & SMB2_GLOBAL_CAP_ENCRYPTION)
2945 cifs_server_dbg(VFS,
2946 "IPC: server doesn't support encryption\n");
2951 tcon = tconInfoAlloc();
2955 scnprintf(unc, sizeof(unc), "\\\\%s\\IPC$", server->hostname);
2958 nls_codepage = load_nls_default();
2964 rc = server->ops->tree_connect(xid, ses, unc, tcon, nls_codepage);
2968 cifs_server_dbg(VFS, "failed to connect to IPC (rc=%d)\n", rc);
2973 cifs_dbg(FYI, "IPC tcon rc = %d ipc tid = %d\n", rc, tcon->tid);
2975 ses->tcon_ipc = tcon;
2977 unload_nls(nls_codepage);
2982 * cifs_free_ipc - helper to release the session IPC tcon
2984 * Needs to be called everytime a session is destroyed
2987 cifs_free_ipc(struct cifs_ses *ses)
2990 struct cifs_tcon *tcon = ses->tcon_ipc;
2995 if (ses->server->ops->tree_disconnect) {
2997 rc = ses->server->ops->tree_disconnect(xid, tcon);
3002 cifs_dbg(FYI, "failed to disconnect IPC tcon (rc=%d)\n", rc);
3005 ses->tcon_ipc = NULL;
3009 static struct cifs_ses *
3010 cifs_find_smb_ses(struct TCP_Server_Info *server, struct smb_vol *vol)
3012 struct cifs_ses *ses;
3014 spin_lock(&cifs_tcp_ses_lock);
3015 list_for_each_entry(ses, &server->smb_ses_list, smb_ses_list) {
3016 if (ses->status == CifsExiting)
3018 if (!match_session(ses, vol))
3021 spin_unlock(&cifs_tcp_ses_lock);
3024 spin_unlock(&cifs_tcp_ses_lock);
3028 void cifs_put_smb_ses(struct cifs_ses *ses)
3030 unsigned int rc, xid;
3031 struct TCP_Server_Info *server = ses->server;
3033 cifs_dbg(FYI, "%s: ses_count=%d\n", __func__, ses->ses_count);
3035 spin_lock(&cifs_tcp_ses_lock);
3036 if (ses->status == CifsExiting) {
3037 spin_unlock(&cifs_tcp_ses_lock);
3040 if (--ses->ses_count > 0) {
3041 spin_unlock(&cifs_tcp_ses_lock);
3044 if (ses->status == CifsGood)
3045 ses->status = CifsExiting;
3046 spin_unlock(&cifs_tcp_ses_lock);
3050 if (ses->status == CifsExiting && server->ops->logoff) {
3052 rc = server->ops->logoff(xid, ses);
3054 cifs_server_dbg(VFS, "%s: Session Logoff failure rc=%d\n",
3059 spin_lock(&cifs_tcp_ses_lock);
3060 list_del_init(&ses->smb_ses_list);
3061 spin_unlock(&cifs_tcp_ses_lock);
3063 /* close any extra channels */
3064 if (ses->chan_count > 1) {
3067 for (i = 1; i < ses->chan_count; i++)
3068 cifs_put_tcp_session(ses->chans[i].server, 0);
3072 cifs_put_tcp_session(server, 0);
3077 /* strlen("cifs:a:") + CIFS_MAX_DOMAINNAME_LEN + 1 */
3078 #define CIFSCREDS_DESC_SIZE (7 + CIFS_MAX_DOMAINNAME_LEN + 1)
3080 /* Populate username and pw fields from keyring if possible */
3082 cifs_set_cifscreds(struct smb_vol *vol, struct cifs_ses *ses)
3086 const char *delim, *payload;
3090 struct TCP_Server_Info *server = ses->server;
3091 struct sockaddr_in *sa;
3092 struct sockaddr_in6 *sa6;
3093 const struct user_key_payload *upayload;
3095 desc = kmalloc(CIFSCREDS_DESC_SIZE, GFP_KERNEL);
3099 /* try to find an address key first */
3100 switch (server->dstaddr.ss_family) {
3102 sa = (struct sockaddr_in *)&server->dstaddr;
3103 sprintf(desc, "cifs:a:%pI4", &sa->sin_addr.s_addr);
3106 sa6 = (struct sockaddr_in6 *)&server->dstaddr;
3107 sprintf(desc, "cifs:a:%pI6c", &sa6->sin6_addr.s6_addr);
3110 cifs_dbg(FYI, "Bad ss_family (%hu)\n",
3111 server->dstaddr.ss_family);
3116 cifs_dbg(FYI, "%s: desc=%s\n", __func__, desc);
3117 key = request_key(&key_type_logon, desc, "");
3119 if (!ses->domainName) {
3120 cifs_dbg(FYI, "domainName is NULL\n");
3125 /* didn't work, try to find a domain key */
3126 sprintf(desc, "cifs:d:%s", ses->domainName);
3127 cifs_dbg(FYI, "%s: desc=%s\n", __func__, desc);
3128 key = request_key(&key_type_logon, desc, "");
3136 down_read(&key->sem);
3137 upayload = user_key_payload_locked(key);
3138 if (IS_ERR_OR_NULL(upayload)) {
3139 rc = upayload ? PTR_ERR(upayload) : -EINVAL;
3143 /* find first : in payload */
3144 payload = upayload->data;
3145 delim = strnchr(payload, upayload->datalen, ':');
3146 cifs_dbg(FYI, "payload=%s\n", payload);
3148 cifs_dbg(FYI, "Unable to find ':' in payload (datalen=%d)\n",
3154 len = delim - payload;
3155 if (len > CIFS_MAX_USERNAME_LEN || len <= 0) {
3156 cifs_dbg(FYI, "Bad value from username search (len=%zd)\n",
3162 vol->username = kstrndup(payload, len, GFP_KERNEL);
3163 if (!vol->username) {
3164 cifs_dbg(FYI, "Unable to allocate %zd bytes for username\n",
3169 cifs_dbg(FYI, "%s: username=%s\n", __func__, vol->username);
3171 len = key->datalen - (len + 1);
3172 if (len > CIFS_MAX_PASSWORD_LEN || len <= 0) {
3173 cifs_dbg(FYI, "Bad len for password search (len=%zd)\n", len);
3175 kfree(vol->username);
3176 vol->username = NULL;
3181 vol->password = kstrndup(delim, len, GFP_KERNEL);
3182 if (!vol->password) {
3183 cifs_dbg(FYI, "Unable to allocate %zd bytes for password\n",
3186 kfree(vol->username);
3187 vol->username = NULL;
3192 * If we have a domain key then we must set the domainName in the
3195 if (is_domain && ses->domainName) {
3196 vol->domainname = kstrndup(ses->domainName,
3197 strlen(ses->domainName),
3199 if (!vol->domainname) {
3200 cifs_dbg(FYI, "Unable to allocate %zd bytes for "
3203 kfree(vol->username);
3204 vol->username = NULL;
3205 kzfree(vol->password);
3206 vol->password = NULL;
3216 cifs_dbg(FYI, "%s: returning %d\n", __func__, rc);
3219 #else /* ! CONFIG_KEYS */
3221 cifs_set_cifscreds(struct smb_vol *vol __attribute__((unused)),
3222 struct cifs_ses *ses __attribute__((unused)))
3226 #endif /* CONFIG_KEYS */
3229 * cifs_get_smb_ses - get a session matching @volume_info data from @server
3231 * This function assumes it is being called from cifs_mount() where we
3232 * already got a server reference (server refcount +1). See
3233 * cifs_get_tcon() for refcount explanations.
3236 cifs_get_smb_ses(struct TCP_Server_Info *server, struct smb_vol *volume_info)
3240 struct cifs_ses *ses;
3241 struct sockaddr_in *addr = (struct sockaddr_in *)&server->dstaddr;
3242 struct sockaddr_in6 *addr6 = (struct sockaddr_in6 *)&server->dstaddr;
3246 ses = cifs_find_smb_ses(server, volume_info);
3248 cifs_dbg(FYI, "Existing smb sess found (status=%d)\n",
3251 mutex_lock(&ses->session_mutex);
3252 rc = cifs_negotiate_protocol(xid, ses);
3254 mutex_unlock(&ses->session_mutex);
3255 /* problem -- put our ses reference */
3256 cifs_put_smb_ses(ses);
3260 if (ses->need_reconnect) {
3261 cifs_dbg(FYI, "Session needs reconnect\n");
3262 rc = cifs_setup_session(xid, ses,
3263 volume_info->local_nls);
3265 mutex_unlock(&ses->session_mutex);
3266 /* problem -- put our reference */
3267 cifs_put_smb_ses(ses);
3272 mutex_unlock(&ses->session_mutex);
3274 /* existing SMB ses has a server reference already */
3275 cifs_put_tcp_session(server, 0);
3280 cifs_dbg(FYI, "Existing smb sess not found\n");
3281 ses = sesInfoAlloc();
3285 /* new SMB session uses our server ref */
3286 ses->server = server;
3287 if (server->dstaddr.ss_family == AF_INET6)
3288 sprintf(ses->serverName, "%pI6", &addr6->sin6_addr);
3290 sprintf(ses->serverName, "%pI4", &addr->sin_addr);
3292 if (volume_info->username) {
3293 ses->user_name = kstrdup(volume_info->username, GFP_KERNEL);
3294 if (!ses->user_name)
3298 /* volume_info->password freed at unmount */
3299 if (volume_info->password) {
3300 ses->password = kstrdup(volume_info->password, GFP_KERNEL);
3304 if (volume_info->domainname) {
3305 ses->domainName = kstrdup(volume_info->domainname, GFP_KERNEL);
3306 if (!ses->domainName)
3309 if (volume_info->domainauto)
3310 ses->domainAuto = volume_info->domainauto;
3311 ses->cred_uid = volume_info->cred_uid;
3312 ses->linux_uid = volume_info->linux_uid;
3314 ses->sectype = volume_info->sectype;
3315 ses->sign = volume_info->sign;
3316 mutex_lock(&ses->session_mutex);
3318 /* add server as first channel */
3319 ses->chans[0].server = server;
3320 ses->chan_count = 1;
3321 ses->chan_max = volume_info->multichannel ? volume_info->max_channels:1;
3323 rc = cifs_negotiate_protocol(xid, ses);
3325 rc = cifs_setup_session(xid, ses, volume_info->local_nls);
3327 /* each channel uses a different signing key */
3328 memcpy(ses->chans[0].signkey, ses->smb3signingkey,
3329 sizeof(ses->smb3signingkey));
3331 mutex_unlock(&ses->session_mutex);
3335 /* success, put it on the list and add it as first channel */
3336 spin_lock(&cifs_tcp_ses_lock);
3337 list_add(&ses->smb_ses_list, &server->smb_ses_list);
3338 spin_unlock(&cifs_tcp_ses_lock);
3342 cifs_setup_ipc(ses, volume_info);
3352 static int match_tcon(struct cifs_tcon *tcon, struct smb_vol *volume_info)
3354 if (tcon->tidStatus == CifsExiting)
3356 if (strncmp(tcon->treeName, volume_info->UNC, MAX_TREE_SIZE))
3358 if (tcon->seal != volume_info->seal)
3360 if (tcon->snapshot_time != volume_info->snapshot_time)
3362 if (tcon->handle_timeout != volume_info->handle_timeout)
3364 if (tcon->no_lease != volume_info->no_lease)
3369 static struct cifs_tcon *
3370 cifs_find_tcon(struct cifs_ses *ses, struct smb_vol *volume_info)
3372 struct list_head *tmp;
3373 struct cifs_tcon *tcon;
3375 spin_lock(&cifs_tcp_ses_lock);
3376 list_for_each(tmp, &ses->tcon_list) {
3377 tcon = list_entry(tmp, struct cifs_tcon, tcon_list);
3378 #ifdef CONFIG_CIFS_DFS_UPCALL
3382 if (!match_tcon(tcon, volume_info))
3385 spin_unlock(&cifs_tcp_ses_lock);
3388 spin_unlock(&cifs_tcp_ses_lock);
3393 cifs_put_tcon(struct cifs_tcon *tcon)
3396 struct cifs_ses *ses;
3399 * IPC tcon share the lifetime of their session and are
3400 * destroyed in the session put function
3402 if (tcon == NULL || tcon->ipc)
3406 cifs_dbg(FYI, "%s: tc_count=%d\n", __func__, tcon->tc_count);
3407 spin_lock(&cifs_tcp_ses_lock);
3408 if (--tcon->tc_count > 0) {
3409 spin_unlock(&cifs_tcp_ses_lock);
3413 list_del_init(&tcon->tcon_list);
3414 spin_unlock(&cifs_tcp_ses_lock);
3417 if (ses->server->ops->tree_disconnect)
3418 ses->server->ops->tree_disconnect(xid, tcon);
3421 cifs_fscache_release_super_cookie(tcon);
3423 cifs_put_smb_ses(ses);
3427 * cifs_get_tcon - get a tcon matching @volume_info data from @ses
3429 * - tcon refcount is the number of mount points using the tcon.
3430 * - ses refcount is the number of tcon using the session.
3432 * 1. This function assumes it is being called from cifs_mount() where
3433 * we already got a session reference (ses refcount +1).
3435 * 2. Since we're in the context of adding a mount point, the end
3436 * result should be either:
3438 * a) a new tcon already allocated with refcount=1 (1 mount point) and
3439 * its session refcount incremented (1 new tcon). This +1 was
3440 * already done in (1).
3442 * b) an existing tcon with refcount+1 (add a mount point to it) and
3443 * identical ses refcount (no new tcon). Because of (1) we need to
3444 * decrement the ses refcount.
3446 static struct cifs_tcon *
3447 cifs_get_tcon(struct cifs_ses *ses, struct smb_vol *volume_info)
3450 struct cifs_tcon *tcon;
3452 tcon = cifs_find_tcon(ses, volume_info);
3455 * tcon has refcount already incremented but we need to
3456 * decrement extra ses reference gotten by caller (case b)
3458 cifs_dbg(FYI, "Found match on UNC path\n");
3459 cifs_put_smb_ses(ses);
3463 if (!ses->server->ops->tree_connect) {
3468 tcon = tconInfoAlloc();
3474 if (volume_info->snapshot_time) {
3475 if (ses->server->vals->protocol_id == 0) {
3477 "Use SMB2 or later for snapshot mount option\n");
3481 tcon->snapshot_time = volume_info->snapshot_time;
3484 if (volume_info->handle_timeout) {
3485 if (ses->server->vals->protocol_id == 0) {
3487 "Use SMB2.1 or later for handle timeout option\n");
3491 tcon->handle_timeout = volume_info->handle_timeout;
3495 if (volume_info->password) {
3496 tcon->password = kstrdup(volume_info->password, GFP_KERNEL);
3497 if (!tcon->password) {
3503 if (volume_info->seal) {
3504 if (ses->server->vals->protocol_id == 0) {
3506 "SMB3 or later required for encryption\n");
3509 } else if (tcon->ses->server->capabilities &
3510 SMB2_GLOBAL_CAP_ENCRYPTION)
3513 cifs_dbg(VFS, "Encryption is not supported on share\n");
3519 if (volume_info->linux_ext) {
3520 if (ses->server->posix_ext_supported) {
3521 tcon->posix_extensions = true;
3522 printk_once(KERN_WARNING
3523 "SMB3.11 POSIX Extensions are experimental\n");
3525 cifs_dbg(VFS, "Server does not support mounting with posix SMB3.11 extensions.\n");
3532 * BB Do we need to wrap session_mutex around this TCon call and Unix
3533 * SetFS as we do on SessSetup and reconnect?
3536 rc = ses->server->ops->tree_connect(xid, ses, volume_info->UNC, tcon,
3537 volume_info->local_nls);
3539 cifs_dbg(FYI, "Tcon rc = %d\n", rc);
3543 tcon->use_persistent = false;
3544 /* check if SMB2 or later, CIFS does not support persistent handles */
3545 if (volume_info->persistent) {
3546 if (ses->server->vals->protocol_id == 0) {
3548 "SMB3 or later required for persistent handles\n");
3551 } else if (ses->server->capabilities &
3552 SMB2_GLOBAL_CAP_PERSISTENT_HANDLES)
3553 tcon->use_persistent = true;
3554 else /* persistent handles requested but not supported */ {
3556 "Persistent handles not supported on share\n");
3560 } else if ((tcon->capabilities & SMB2_SHARE_CAP_CONTINUOUS_AVAILABILITY)
3561 && (ses->server->capabilities & SMB2_GLOBAL_CAP_PERSISTENT_HANDLES)
3562 && (volume_info->nopersistent == false)) {
3563 cifs_dbg(FYI, "enabling persistent handles\n");
3564 tcon->use_persistent = true;
3565 } else if (volume_info->resilient) {
3566 if (ses->server->vals->protocol_id == 0) {
3568 "SMB2.1 or later required for resilient handles\n");
3572 tcon->use_resilient = true;
3575 /* If the user really knows what they are doing they can override */
3576 if (tcon->share_flags & SMB2_SHAREFLAG_NO_CACHING) {
3577 if (volume_info->cache_ro)
3578 cifs_dbg(VFS, "cache=ro requested on mount but NO_CACHING flag set on share\n");
3579 else if (volume_info->cache_rw)
3580 cifs_dbg(VFS, "cache=singleclient requested on mount but NO_CACHING flag set on share\n");
3584 * We can have only one retry value for a connection to a share so for
3585 * resources mounted more than once to the same server share the last
3586 * value passed in for the retry flag is used.
3588 tcon->retry = volume_info->retry;
3589 tcon->nocase = volume_info->nocase;
3590 tcon->nohandlecache = volume_info->nohandlecache;
3591 tcon->local_lease = volume_info->local_lease;
3592 tcon->no_lease = volume_info->no_lease;
3593 INIT_LIST_HEAD(&tcon->pending_opens);
3595 spin_lock(&cifs_tcp_ses_lock);
3596 list_add(&tcon->tcon_list, &ses->tcon_list);
3597 spin_unlock(&cifs_tcp_ses_lock);
3599 cifs_fscache_get_super_cookie(tcon);
3609 cifs_put_tlink(struct tcon_link *tlink)
3611 if (!tlink || IS_ERR(tlink))
3614 if (!atomic_dec_and_test(&tlink->tl_count) ||
3615 test_bit(TCON_LINK_IN_TREE, &tlink->tl_flags)) {
3616 tlink->tl_time = jiffies;
3620 if (!IS_ERR(tlink_tcon(tlink)))
3621 cifs_put_tcon(tlink_tcon(tlink));
3627 compare_mount_options(struct super_block *sb, struct cifs_mnt_data *mnt_data)
3629 struct cifs_sb_info *old = CIFS_SB(sb);
3630 struct cifs_sb_info *new = mnt_data->cifs_sb;
3631 unsigned int oldflags = old->mnt_cifs_flags & CIFS_MOUNT_MASK;
3632 unsigned int newflags = new->mnt_cifs_flags & CIFS_MOUNT_MASK;
3634 if ((sb->s_flags & CIFS_MS_MASK) != (mnt_data->flags & CIFS_MS_MASK))
3637 if (old->mnt_cifs_serverino_autodisabled)
3638 newflags &= ~CIFS_MOUNT_SERVER_INUM;
3640 if (oldflags != newflags)
3644 * We want to share sb only if we don't specify an r/wsize or
3645 * specified r/wsize is greater than or equal to existing one.
3647 if (new->wsize && new->wsize < old->wsize)
3650 if (new->rsize && new->rsize < old->rsize)
3653 if (!uid_eq(old->mnt_uid, new->mnt_uid) || !gid_eq(old->mnt_gid, new->mnt_gid))
3656 if (old->mnt_file_mode != new->mnt_file_mode ||
3657 old->mnt_dir_mode != new->mnt_dir_mode)
3660 if (strcmp(old->local_nls->charset, new->local_nls->charset))
3663 if (old->actimeo != new->actimeo)
3670 match_prepath(struct super_block *sb, struct cifs_mnt_data *mnt_data)
3672 struct cifs_sb_info *old = CIFS_SB(sb);
3673 struct cifs_sb_info *new = mnt_data->cifs_sb;
3674 bool old_set = (old->mnt_cifs_flags & CIFS_MOUNT_USE_PREFIX_PATH) &&
3676 bool new_set = (new->mnt_cifs_flags & CIFS_MOUNT_USE_PREFIX_PATH) &&
3679 if (old_set && new_set && !strcmp(new->prepath, old->prepath))
3681 else if (!old_set && !new_set)
3688 cifs_match_super(struct super_block *sb, void *data)
3690 struct cifs_mnt_data *mnt_data = (struct cifs_mnt_data *)data;
3691 struct smb_vol *volume_info;
3692 struct cifs_sb_info *cifs_sb;
3693 struct TCP_Server_Info *tcp_srv;
3694 struct cifs_ses *ses;
3695 struct cifs_tcon *tcon;
3696 struct tcon_link *tlink;
3699 spin_lock(&cifs_tcp_ses_lock);
3700 cifs_sb = CIFS_SB(sb);
3701 tlink = cifs_get_tlink(cifs_sb_master_tlink(cifs_sb));
3702 if (IS_ERR(tlink)) {
3703 spin_unlock(&cifs_tcp_ses_lock);
3706 tcon = tlink_tcon(tlink);
3708 tcp_srv = ses->server;
3710 volume_info = mnt_data->vol;
3712 if (!match_server(tcp_srv, volume_info) ||
3713 !match_session(ses, volume_info) ||
3714 !match_tcon(tcon, volume_info) ||
3715 !match_prepath(sb, mnt_data)) {
3720 rc = compare_mount_options(sb, mnt_data);
3722 spin_unlock(&cifs_tcp_ses_lock);
3723 cifs_put_tlink(tlink);
3727 #ifdef CONFIG_DEBUG_LOCK_ALLOC
3728 static struct lock_class_key cifs_key[2];
3729 static struct lock_class_key cifs_slock_key[2];
3732 cifs_reclassify_socket4(struct socket *sock)
3734 struct sock *sk = sock->sk;
3735 BUG_ON(!sock_allow_reclassification(sk));
3736 sock_lock_init_class_and_name(sk, "slock-AF_INET-CIFS",
3737 &cifs_slock_key[0], "sk_lock-AF_INET-CIFS", &cifs_key[0]);
3741 cifs_reclassify_socket6(struct socket *sock)
3743 struct sock *sk = sock->sk;
3744 BUG_ON(!sock_allow_reclassification(sk));
3745 sock_lock_init_class_and_name(sk, "slock-AF_INET6-CIFS",
3746 &cifs_slock_key[1], "sk_lock-AF_INET6-CIFS", &cifs_key[1]);
3750 cifs_reclassify_socket4(struct socket *sock)
3755 cifs_reclassify_socket6(struct socket *sock)
3760 /* See RFC1001 section 14 on representation of Netbios names */
3761 static void rfc1002mangle(char *target, char *source, unsigned int length)
3765 for (i = 0, j = 0; i < (length); i++) {
3766 /* mask a nibble at a time and encode */
3767 target[j] = 'A' + (0x0F & (source[i] >> 4));
3768 target[j+1] = 'A' + (0x0F & source[i]);
3775 bind_socket(struct TCP_Server_Info *server)
3778 if (server->srcaddr.ss_family != AF_UNSPEC) {
3779 /* Bind to the specified local IP address */
3780 struct socket *socket = server->ssocket;
3781 rc = socket->ops->bind(socket,
3782 (struct sockaddr *) &server->srcaddr,
3783 sizeof(server->srcaddr));
3785 struct sockaddr_in *saddr4;
3786 struct sockaddr_in6 *saddr6;
3787 saddr4 = (struct sockaddr_in *)&server->srcaddr;
3788 saddr6 = (struct sockaddr_in6 *)&server->srcaddr;
3789 if (saddr6->sin6_family == AF_INET6)
3790 cifs_server_dbg(VFS, "Failed to bind to: %pI6c, error: %d\n",
3791 &saddr6->sin6_addr, rc);
3793 cifs_server_dbg(VFS, "Failed to bind to: %pI4, error: %d\n",
3794 &saddr4->sin_addr.s_addr, rc);
3801 ip_rfc1001_connect(struct TCP_Server_Info *server)
3805 * some servers require RFC1001 sessinit before sending
3806 * negprot - BB check reconnection in case where second
3807 * sessinit is sent but no second negprot
3809 struct rfc1002_session_packet *ses_init_buf;
3810 struct smb_hdr *smb_buf;
3811 ses_init_buf = kzalloc(sizeof(struct rfc1002_session_packet),
3814 ses_init_buf->trailer.session_req.called_len = 32;
3816 if (server->server_RFC1001_name[0] != 0)
3817 rfc1002mangle(ses_init_buf->trailer.
3818 session_req.called_name,
3819 server->server_RFC1001_name,
3820 RFC1001_NAME_LEN_WITH_NULL);
3822 rfc1002mangle(ses_init_buf->trailer.
3823 session_req.called_name,
3824 DEFAULT_CIFS_CALLED_NAME,
3825 RFC1001_NAME_LEN_WITH_NULL);
3827 ses_init_buf->trailer.session_req.calling_len = 32;
3830 * calling name ends in null (byte 16) from old smb
3833 if (server->workstation_RFC1001_name[0] != 0)
3834 rfc1002mangle(ses_init_buf->trailer.
3835 session_req.calling_name,
3836 server->workstation_RFC1001_name,
3837 RFC1001_NAME_LEN_WITH_NULL);
3839 rfc1002mangle(ses_init_buf->trailer.
3840 session_req.calling_name,
3842 RFC1001_NAME_LEN_WITH_NULL);
3844 ses_init_buf->trailer.session_req.scope1 = 0;
3845 ses_init_buf->trailer.session_req.scope2 = 0;
3846 smb_buf = (struct smb_hdr *)ses_init_buf;
3848 /* sizeof RFC1002_SESSION_REQUEST with no scope */
3849 smb_buf->smb_buf_length = cpu_to_be32(0x81000044);
3850 rc = smb_send(server, smb_buf, 0x44);
3851 kfree(ses_init_buf);
3853 * RFC1001 layer in at least one server
3854 * requires very short break before negprot
3855 * presumably because not expecting negprot
3856 * to follow so fast. This is a simple
3857 * solution that works without
3858 * complicating the code and causes no
3859 * significant slowing down on mount
3862 usleep_range(1000, 2000);
3865 * else the negprot may still work without this
3866 * even though malloc failed
3873 generic_ip_connect(struct TCP_Server_Info *server)
3878 struct socket *socket = server->ssocket;
3879 struct sockaddr *saddr;
3881 saddr = (struct sockaddr *) &server->dstaddr;
3883 if (server->dstaddr.ss_family == AF_INET6) {
3884 sport = ((struct sockaddr_in6 *) saddr)->sin6_port;
3885 slen = sizeof(struct sockaddr_in6);
3888 sport = ((struct sockaddr_in *) saddr)->sin_port;
3889 slen = sizeof(struct sockaddr_in);
3893 if (socket == NULL) {
3894 rc = __sock_create(cifs_net_ns(server), sfamily, SOCK_STREAM,
3895 IPPROTO_TCP, &socket, 1);
3897 cifs_server_dbg(VFS, "Error %d creating socket\n", rc);
3898 server->ssocket = NULL;
3902 /* BB other socket options to set KEEPALIVE, NODELAY? */
3903 cifs_dbg(FYI, "Socket created\n");
3904 server->ssocket = socket;
3905 socket->sk->sk_allocation = GFP_NOFS;
3906 if (sfamily == AF_INET6)
3907 cifs_reclassify_socket6(socket);
3909 cifs_reclassify_socket4(socket);
3912 rc = bind_socket(server);
3917 * Eventually check for other socket options to change from
3918 * the default. sock_setsockopt not used because it expects
3921 socket->sk->sk_rcvtimeo = 7 * HZ;
3922 socket->sk->sk_sndtimeo = 5 * HZ;
3924 /* make the bufsizes depend on wsize/rsize and max requests */
3925 if (server->noautotune) {
3926 if (socket->sk->sk_sndbuf < (200 * 1024))
3927 socket->sk->sk_sndbuf = 200 * 1024;
3928 if (socket->sk->sk_rcvbuf < (140 * 1024))
3929 socket->sk->sk_rcvbuf = 140 * 1024;
3932 if (server->tcp_nodelay) {
3934 rc = kernel_setsockopt(socket, SOL_TCP, TCP_NODELAY,
3935 (char *)&val, sizeof(val));
3937 cifs_dbg(FYI, "set TCP_NODELAY socket option error %d\n",
3941 cifs_dbg(FYI, "sndbuf %d rcvbuf %d rcvtimeo 0x%lx\n",
3942 socket->sk->sk_sndbuf,
3943 socket->sk->sk_rcvbuf, socket->sk->sk_rcvtimeo);
3945 rc = socket->ops->connect(socket, saddr, slen,
3946 server->noblockcnt ? O_NONBLOCK : 0);
3948 * When mounting SMB root file systems, we do not want to block in
3949 * connect. Otherwise bail out and then let cifs_reconnect() perform
3950 * reconnect failover - if possible.
3952 if (server->noblockcnt && rc == -EINPROGRESS)
3955 cifs_dbg(FYI, "Error %d connecting to server\n", rc);
3956 sock_release(socket);
3957 server->ssocket = NULL;
3961 if (sport == htons(RFC1001_PORT))
3962 rc = ip_rfc1001_connect(server);
3968 ip_connect(struct TCP_Server_Info *server)
3971 struct sockaddr_in6 *addr6 = (struct sockaddr_in6 *)&server->dstaddr;
3972 struct sockaddr_in *addr = (struct sockaddr_in *)&server->dstaddr;
3974 if (server->dstaddr.ss_family == AF_INET6)
3975 sport = &addr6->sin6_port;
3977 sport = &addr->sin_port;
3982 /* try with 445 port at first */
3983 *sport = htons(CIFS_PORT);
3985 rc = generic_ip_connect(server);
3989 /* if it failed, try with 139 port */
3990 *sport = htons(RFC1001_PORT);
3993 return generic_ip_connect(server);
3996 void reset_cifs_unix_caps(unsigned int xid, struct cifs_tcon *tcon,
3997 struct cifs_sb_info *cifs_sb, struct smb_vol *vol_info)
3999 /* if we are reconnecting then should we check to see if
4000 * any requested capabilities changed locally e.g. via
4001 * remount but we can not do much about it here
4002 * if they have (even if we could detect it by the following)
4003 * Perhaps we could add a backpointer to array of sb from tcon
4004 * or if we change to make all sb to same share the same
4005 * sb as NFS - then we only have one backpointer to sb.
4006 * What if we wanted to mount the server share twice once with
4007 * and once without posixacls or posix paths? */
4008 __u64 saved_cap = le64_to_cpu(tcon->fsUnixInfo.Capability);
4010 if (vol_info && vol_info->no_linux_ext) {
4011 tcon->fsUnixInfo.Capability = 0;
4012 tcon->unix_ext = 0; /* Unix Extensions disabled */
4013 cifs_dbg(FYI, "Linux protocol extensions disabled\n");
4015 } else if (vol_info)
4016 tcon->unix_ext = 1; /* Unix Extensions supported */
4018 if (tcon->unix_ext == 0) {
4019 cifs_dbg(FYI, "Unix extensions disabled so not set on reconnect\n");
4023 if (!CIFSSMBQFSUnixInfo(xid, tcon)) {
4024 __u64 cap = le64_to_cpu(tcon->fsUnixInfo.Capability);
4025 cifs_dbg(FYI, "unix caps which server supports %lld\n", cap);
4026 /* check for reconnect case in which we do not
4027 want to change the mount behavior if we can avoid it */
4028 if (vol_info == NULL) {
4029 /* turn off POSIX ACL and PATHNAMES if not set
4030 originally at mount time */
4031 if ((saved_cap & CIFS_UNIX_POSIX_ACL_CAP) == 0)
4032 cap &= ~CIFS_UNIX_POSIX_ACL_CAP;
4033 if ((saved_cap & CIFS_UNIX_POSIX_PATHNAMES_CAP) == 0) {
4034 if (cap & CIFS_UNIX_POSIX_PATHNAMES_CAP)
4035 cifs_dbg(VFS, "POSIXPATH support change\n");
4036 cap &= ~CIFS_UNIX_POSIX_PATHNAMES_CAP;
4037 } else if ((cap & CIFS_UNIX_POSIX_PATHNAMES_CAP) == 0) {
4038 cifs_dbg(VFS, "possible reconnect error\n");
4039 cifs_dbg(VFS, "server disabled POSIX path support\n");
4043 if (cap & CIFS_UNIX_TRANSPORT_ENCRYPTION_MANDATORY_CAP)
4044 cifs_dbg(VFS, "per-share encryption not supported yet\n");
4046 cap &= CIFS_UNIX_CAP_MASK;
4047 if (vol_info && vol_info->no_psx_acl)
4048 cap &= ~CIFS_UNIX_POSIX_ACL_CAP;
4049 else if (CIFS_UNIX_POSIX_ACL_CAP & cap) {
4050 cifs_dbg(FYI, "negotiated posix acl support\n");
4052 cifs_sb->mnt_cifs_flags |=
4053 CIFS_MOUNT_POSIXACL;
4056 if (vol_info && vol_info->posix_paths == 0)
4057 cap &= ~CIFS_UNIX_POSIX_PATHNAMES_CAP;
4058 else if (cap & CIFS_UNIX_POSIX_PATHNAMES_CAP) {
4059 cifs_dbg(FYI, "negotiate posix pathnames\n");
4061 cifs_sb->mnt_cifs_flags |=
4062 CIFS_MOUNT_POSIX_PATHS;
4065 cifs_dbg(FYI, "Negotiate caps 0x%x\n", (int)cap);
4066 #ifdef CONFIG_CIFS_DEBUG2
4067 if (cap & CIFS_UNIX_FCNTL_CAP)
4068 cifs_dbg(FYI, "FCNTL cap\n");
4069 if (cap & CIFS_UNIX_EXTATTR_CAP)
4070 cifs_dbg(FYI, "EXTATTR cap\n");
4071 if (cap & CIFS_UNIX_POSIX_PATHNAMES_CAP)
4072 cifs_dbg(FYI, "POSIX path cap\n");
4073 if (cap & CIFS_UNIX_XATTR_CAP)
4074 cifs_dbg(FYI, "XATTR cap\n");
4075 if (cap & CIFS_UNIX_POSIX_ACL_CAP)
4076 cifs_dbg(FYI, "POSIX ACL cap\n");
4077 if (cap & CIFS_UNIX_LARGE_READ_CAP)
4078 cifs_dbg(FYI, "very large read cap\n");
4079 if (cap & CIFS_UNIX_LARGE_WRITE_CAP)
4080 cifs_dbg(FYI, "very large write cap\n");
4081 if (cap & CIFS_UNIX_TRANSPORT_ENCRYPTION_CAP)
4082 cifs_dbg(FYI, "transport encryption cap\n");
4083 if (cap & CIFS_UNIX_TRANSPORT_ENCRYPTION_MANDATORY_CAP)
4084 cifs_dbg(FYI, "mandatory transport encryption cap\n");
4085 #endif /* CIFS_DEBUG2 */
4086 if (CIFSSMBSetFSUnixInfo(xid, tcon, cap)) {
4087 if (vol_info == NULL) {
4088 cifs_dbg(FYI, "resetting capabilities failed\n");
4090 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");
4096 int cifs_setup_cifs_sb(struct smb_vol *pvolume_info,
4097 struct cifs_sb_info *cifs_sb)
4099 INIT_DELAYED_WORK(&cifs_sb->prune_tlinks, cifs_prune_tlinks);
4101 spin_lock_init(&cifs_sb->tlink_tree_lock);
4102 cifs_sb->tlink_tree = RB_ROOT;
4104 cifs_sb->bsize = pvolume_info->bsize;
4106 * Temporarily set r/wsize for matching superblock. If we end up using
4107 * new sb then client will later negotiate it downward if needed.
4109 cifs_sb->rsize = pvolume_info->rsize;
4110 cifs_sb->wsize = pvolume_info->wsize;
4112 cifs_sb->mnt_uid = pvolume_info->linux_uid;
4113 cifs_sb->mnt_gid = pvolume_info->linux_gid;
4114 cifs_sb->mnt_file_mode = pvolume_info->file_mode;
4115 cifs_sb->mnt_dir_mode = pvolume_info->dir_mode;
4116 cifs_dbg(FYI, "file mode: %04ho dir mode: %04ho\n",
4117 cifs_sb->mnt_file_mode, cifs_sb->mnt_dir_mode);
4119 cifs_sb->actimeo = pvolume_info->actimeo;
4120 cifs_sb->local_nls = pvolume_info->local_nls;
4122 if (pvolume_info->nodfs)
4123 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_NO_DFS;
4124 if (pvolume_info->noperm)
4125 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_NO_PERM;
4126 if (pvolume_info->setuids)
4127 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_SET_UID;
4128 if (pvolume_info->setuidfromacl)
4129 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_UID_FROM_ACL;
4130 if (pvolume_info->server_ino)
4131 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_SERVER_INUM;
4132 if (pvolume_info->remap)
4133 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_MAP_SFM_CHR;
4134 if (pvolume_info->sfu_remap)
4135 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_MAP_SPECIAL_CHR;
4136 if (pvolume_info->no_xattr)
4137 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_NO_XATTR;
4138 if (pvolume_info->sfu_emul)
4139 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_UNX_EMUL;
4140 if (pvolume_info->nobrl)
4141 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_NO_BRL;
4142 if (pvolume_info->nohandlecache)
4143 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_NO_HANDLE_CACHE;
4144 if (pvolume_info->nostrictsync)
4145 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_NOSSYNC;
4146 if (pvolume_info->mand_lock)
4147 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_NOPOSIXBRL;
4148 if (pvolume_info->rwpidforward)
4149 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_RWPIDFORWARD;
4150 if (pvolume_info->mode_ace)
4151 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_MODE_FROM_SID;
4152 if (pvolume_info->cifs_acl)
4153 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_CIFS_ACL;
4154 if (pvolume_info->backupuid_specified) {
4155 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_CIFS_BACKUPUID;
4156 cifs_sb->mnt_backupuid = pvolume_info->backupuid;
4158 if (pvolume_info->backupgid_specified) {
4159 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_CIFS_BACKUPGID;
4160 cifs_sb->mnt_backupgid = pvolume_info->backupgid;
4162 if (pvolume_info->override_uid)
4163 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_OVERR_UID;
4164 if (pvolume_info->override_gid)
4165 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_OVERR_GID;
4166 if (pvolume_info->dynperm)
4167 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_DYNPERM;
4168 if (pvolume_info->fsc)
4169 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_FSCACHE;
4170 if (pvolume_info->multiuser)
4171 cifs_sb->mnt_cifs_flags |= (CIFS_MOUNT_MULTIUSER |
4172 CIFS_MOUNT_NO_PERM);
4173 if (pvolume_info->strict_io)
4174 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_STRICT_IO;
4175 if (pvolume_info->direct_io) {
4176 cifs_dbg(FYI, "mounting share using direct i/o\n");
4177 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_DIRECT_IO;
4179 if (pvolume_info->cache_ro) {
4180 cifs_dbg(VFS, "mounting share with read only caching. Ensure that the share will not be modified while in use.\n");
4181 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_RO_CACHE;
4182 } else if (pvolume_info->cache_rw) {
4183 cifs_dbg(VFS, "mounting share in single client RW caching mode. Ensure that no other systems will be accessing the share.\n");
4184 cifs_sb->mnt_cifs_flags |= (CIFS_MOUNT_RO_CACHE |
4185 CIFS_MOUNT_RW_CACHE);
4187 if (pvolume_info->mfsymlinks) {
4188 if (pvolume_info->sfu_emul) {
4190 * Our SFU ("Services for Unix" emulation does not allow
4191 * creating symlinks but does allow reading existing SFU
4192 * symlinks (it does allow both creating and reading SFU
4193 * style mknod and FIFOs though). When "mfsymlinks" and
4194 * "sfu" are both enabled at the same time, it allows
4195 * reading both types of symlinks, but will only create
4196 * them with mfsymlinks format. This allows better
4197 * Apple compatibility (probably better for Samba too)
4198 * while still recognizing old Windows style symlinks.
4200 cifs_dbg(VFS, "mount options mfsymlinks and sfu both enabled\n");
4202 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_MF_SYMLINKS;
4205 if ((pvolume_info->cifs_acl) && (pvolume_info->dynperm))
4206 cifs_dbg(VFS, "mount option dynperm ignored if cifsacl mount option supported\n");
4208 if (pvolume_info->prepath) {
4209 cifs_sb->prepath = kstrdup(pvolume_info->prepath, GFP_KERNEL);
4210 if (cifs_sb->prepath == NULL)
4218 cifs_cleanup_volume_info_contents(struct smb_vol *volume_info)
4220 kfree(volume_info->username);
4221 kzfree(volume_info->password);
4222 kfree(volume_info->UNC);
4223 kfree(volume_info->domainname);
4224 kfree(volume_info->iocharset);
4225 kfree(volume_info->prepath);
4229 cifs_cleanup_volume_info(struct smb_vol *volume_info)
4233 cifs_cleanup_volume_info_contents(volume_info);
4237 /* Release all succeed connections */
4238 static inline void mount_put_conns(struct cifs_sb_info *cifs_sb,
4240 struct TCP_Server_Info *server,
4241 struct cifs_ses *ses, struct cifs_tcon *tcon)
4246 cifs_put_tcon(tcon);
4248 cifs_put_smb_ses(ses);
4250 cifs_put_tcp_session(server, 0);
4251 cifs_sb->mnt_cifs_flags &= ~CIFS_MOUNT_POSIX_PATHS;
4255 /* Get connections for tcp, ses and tcon */
4256 static int mount_get_conns(struct smb_vol *vol, struct cifs_sb_info *cifs_sb,
4258 struct TCP_Server_Info **nserver,
4259 struct cifs_ses **nses, struct cifs_tcon **ntcon)
4262 struct TCP_Server_Info *server;
4263 struct cifs_ses *ses;
4264 struct cifs_tcon *tcon;
4272 /* get a reference to a tcp session */
4273 server = cifs_get_tcp_session(vol);
4274 if (IS_ERR(server)) {
4275 rc = PTR_ERR(server);
4281 if ((vol->max_credits < 20) || (vol->max_credits > 60000))
4282 server->max_credits = SMB2_MAX_CREDITS_AVAILABLE;
4284 server->max_credits = vol->max_credits;
4286 /* get a reference to a SMB session */
4287 ses = cifs_get_smb_ses(server, vol);
4295 if ((vol->persistent == true) && (!(ses->server->capabilities &
4296 SMB2_GLOBAL_CAP_PERSISTENT_HANDLES))) {
4297 cifs_server_dbg(VFS, "persistent handles not supported by server\n");
4301 /* search for existing tcon to this server share */
4302 tcon = cifs_get_tcon(ses, vol);
4310 /* if new SMB3.11 POSIX extensions are supported do not remap / and \ */
4311 if (tcon->posix_extensions)
4312 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_POSIX_PATHS;
4314 /* tell server which Unix caps we support */
4315 if (cap_unix(tcon->ses)) {
4317 * reset of caps checks mount to see if unix extensions disabled
4318 * for just this mount.
4320 reset_cifs_unix_caps(*xid, tcon, cifs_sb, vol);
4321 if ((tcon->ses->server->tcpStatus == CifsNeedReconnect) &&
4322 (le64_to_cpu(tcon->fsUnixInfo.Capability) &
4323 CIFS_UNIX_TRANSPORT_ENCRYPTION_MANDATORY_CAP))
4326 tcon->unix_ext = 0; /* server does not support them */
4328 /* do not care if a following call succeed - informational */
4329 if (!tcon->pipe && server->ops->qfs_tcon) {
4330 server->ops->qfs_tcon(*xid, tcon, cifs_sb);
4331 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_RO_CACHE) {
4332 if (tcon->fsDevInfo.DeviceCharacteristics &
4333 cpu_to_le32(FILE_READ_ONLY_DEVICE))
4334 cifs_dbg(VFS, "mounted to read only share\n");
4335 else if ((cifs_sb->mnt_cifs_flags &
4336 CIFS_MOUNT_RW_CACHE) == 0)
4337 cifs_dbg(VFS, "read only mount of RW share\n");
4338 /* no need to log a RW mount of a typical RW share */
4342 cifs_sb->wsize = server->ops->negotiate_wsize(tcon, vol);
4343 cifs_sb->rsize = server->ops->negotiate_rsize(tcon, vol);
4348 static int mount_setup_tlink(struct cifs_sb_info *cifs_sb, struct cifs_ses *ses,
4349 struct cifs_tcon *tcon)
4351 struct tcon_link *tlink;
4353 /* hang the tcon off of the superblock */
4354 tlink = kzalloc(sizeof(*tlink), GFP_KERNEL);
4358 tlink->tl_uid = ses->linux_uid;
4359 tlink->tl_tcon = tcon;
4360 tlink->tl_time = jiffies;
4361 set_bit(TCON_LINK_MASTER, &tlink->tl_flags);
4362 set_bit(TCON_LINK_IN_TREE, &tlink->tl_flags);
4364 cifs_sb->master_tlink = tlink;
4365 spin_lock(&cifs_sb->tlink_tree_lock);
4366 tlink_rb_insert(&cifs_sb->tlink_tree, tlink);
4367 spin_unlock(&cifs_sb->tlink_tree_lock);
4369 queue_delayed_work(cifsiod_wq, &cifs_sb->prune_tlinks,
4374 #ifdef CONFIG_CIFS_DFS_UPCALL
4376 * cifs_build_path_to_root returns full path to root when we do not have an
4377 * exiting connection (tcon)
4380 build_unc_path_to_root(const struct smb_vol *vol,
4381 const struct cifs_sb_info *cifs_sb, bool useppath)
4383 char *full_path, *pos;
4384 unsigned int pplen = useppath && vol->prepath ?
4385 strlen(vol->prepath) + 1 : 0;
4386 unsigned int unc_len = strnlen(vol->UNC, MAX_TREE_SIZE + 1);
4388 if (unc_len > MAX_TREE_SIZE)
4389 return ERR_PTR(-EINVAL);
4391 full_path = kmalloc(unc_len + pplen + 1, GFP_KERNEL);
4392 if (full_path == NULL)
4393 return ERR_PTR(-ENOMEM);
4395 memcpy(full_path, vol->UNC, unc_len);
4396 pos = full_path + unc_len;
4399 *pos = CIFS_DIR_SEP(cifs_sb);
4400 memcpy(pos + 1, vol->prepath, pplen);
4404 *pos = '\0'; /* add trailing null */
4405 convert_delimiter(full_path, CIFS_DIR_SEP(cifs_sb));
4406 cifs_dbg(FYI, "%s: full_path=%s\n", __func__, full_path);
4411 * expand_dfs_referral - Perform a dfs referral query and update the cifs_sb
4414 * If a referral is found, cifs_sb->mountdata will be (re-)allocated
4415 * to a string containing updated options for the submount. Otherwise it
4416 * will be left untouched.
4418 * Returns the rc from get_dfs_path to the caller, which can be used to
4419 * determine whether there were referrals.
4422 expand_dfs_referral(const unsigned int xid, struct cifs_ses *ses,
4423 struct smb_vol *volume_info, struct cifs_sb_info *cifs_sb,
4427 struct dfs_info3_param referral = {0};
4428 char *full_path = NULL, *ref_path = NULL, *mdata = NULL;
4430 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_DFS)
4433 full_path = build_unc_path_to_root(volume_info, cifs_sb, true);
4434 if (IS_ERR(full_path))
4435 return PTR_ERR(full_path);
4437 /* For DFS paths, skip the first '\' of the UNC */
4438 ref_path = check_prefix ? full_path + 1 : volume_info->UNC + 1;
4440 rc = dfs_cache_find(xid, ses, cifs_sb->local_nls, cifs_remap(cifs_sb),
4441 ref_path, &referral, NULL);
4443 char *fake_devname = NULL;
4445 mdata = cifs_compose_mount_options(cifs_sb->mountdata,
4446 full_path + 1, &referral,
4448 free_dfs_info_param(&referral);
4450 if (IS_ERR(mdata)) {
4451 rc = PTR_ERR(mdata);
4454 cifs_cleanup_volume_info_contents(volume_info);
4455 rc = cifs_setup_volume_info(volume_info, mdata,
4456 fake_devname, false);
4458 kfree(fake_devname);
4459 kfree(cifs_sb->mountdata);
4460 cifs_sb->mountdata = mdata;
4466 static inline int get_next_dfs_tgt(const char *path,
4467 struct dfs_cache_tgt_list *tgt_list,
4468 struct dfs_cache_tgt_iterator **tgt_it)
4471 *tgt_it = dfs_cache_get_tgt_iterator(tgt_list);
4473 *tgt_it = dfs_cache_get_next_tgt(tgt_list, *tgt_it);
4474 return !*tgt_it ? -EHOSTDOWN : 0;
4477 static int update_vol_info(const struct dfs_cache_tgt_iterator *tgt_it,
4478 struct smb_vol *fake_vol, struct smb_vol *vol)
4480 const char *tgt = dfs_cache_get_tgt_name(tgt_it);
4481 int len = strlen(tgt) + 2;
4484 new_unc = kmalloc(len, GFP_KERNEL);
4487 scnprintf(new_unc, len, "\\%s", tgt);
4492 if (fake_vol->prepath) {
4493 kfree(vol->prepath);
4494 vol->prepath = fake_vol->prepath;
4495 fake_vol->prepath = NULL;
4497 memcpy(&vol->dstaddr, &fake_vol->dstaddr, sizeof(vol->dstaddr));
4502 static int setup_dfs_tgt_conn(const char *path,
4503 const struct dfs_cache_tgt_iterator *tgt_it,
4504 struct cifs_sb_info *cifs_sb,
4505 struct smb_vol *vol,
4507 struct TCP_Server_Info **server,
4508 struct cifs_ses **ses,
4509 struct cifs_tcon **tcon)
4512 struct dfs_info3_param ref = {0};
4513 char *mdata = NULL, *fake_devname = NULL;
4514 struct smb_vol fake_vol = {NULL};
4516 cifs_dbg(FYI, "%s: dfs path: %s\n", __func__, path);
4518 rc = dfs_cache_get_tgt_referral(path, tgt_it, &ref);
4522 mdata = cifs_compose_mount_options(cifs_sb->mountdata, path, &ref,
4524 free_dfs_info_param(&ref);
4526 if (IS_ERR(mdata)) {
4527 rc = PTR_ERR(mdata);
4530 cifs_dbg(FYI, "%s: fake_devname: %s\n", __func__, fake_devname);
4531 rc = cifs_setup_volume_info(&fake_vol, mdata, fake_devname,
4535 kfree(fake_devname);
4539 * We use a 'fake_vol' here because we need pass it down to the
4540 * mount_{get,put} functions to test connection against new DFS
4543 mount_put_conns(cifs_sb, *xid, *server, *ses, *tcon);
4544 rc = mount_get_conns(&fake_vol, cifs_sb, xid, server, ses,
4548 * We were able to connect to new target server.
4549 * Update current volume info with new target server.
4551 rc = update_vol_info(tgt_it, &fake_vol, vol);
4554 cifs_cleanup_volume_info_contents(&fake_vol);
4558 static int mount_do_dfs_failover(const char *path,
4559 struct cifs_sb_info *cifs_sb,
4560 struct smb_vol *vol,
4561 struct cifs_ses *root_ses,
4563 struct TCP_Server_Info **server,
4564 struct cifs_ses **ses,
4565 struct cifs_tcon **tcon)
4568 struct dfs_cache_tgt_list tgt_list;
4569 struct dfs_cache_tgt_iterator *tgt_it = NULL;
4571 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_DFS)
4574 rc = dfs_cache_noreq_find(path, NULL, &tgt_list);
4579 /* Get next DFS target server - if any */
4580 rc = get_next_dfs_tgt(path, &tgt_list, &tgt_it);
4583 /* Connect to next DFS target */
4584 rc = setup_dfs_tgt_conn(path, tgt_it, cifs_sb, vol, xid, server,
4586 if (!rc || rc == -EACCES || rc == -EOPNOTSUPP)
4591 * Update DFS target hint in DFS referral cache with the target
4592 * server we successfully reconnected to.
4594 rc = dfs_cache_update_tgthint(*xid, root_ses ? root_ses : *ses,
4596 cifs_remap(cifs_sb), path,
4599 dfs_cache_free_tgts(&tgt_list);
4605 cifs_setup_volume_info(struct smb_vol *volume_info, char *mount_data,
4606 const char *devname, bool is_smb3)
4610 if (cifs_parse_mount_options(mount_data, devname, volume_info, is_smb3))
4613 if (volume_info->nullauth) {
4614 cifs_dbg(FYI, "Anonymous login\n");
4615 kfree(volume_info->username);
4616 volume_info->username = NULL;
4617 } else if (volume_info->username) {
4618 /* BB fixme parse for domain name here */
4619 cifs_dbg(FYI, "Username: %s\n", volume_info->username);
4621 cifs_dbg(VFS, "No username specified\n");
4622 /* In userspace mount helper we can get user name from alternate
4623 locations such as env variables and files on disk */
4627 /* this is needed for ASCII cp to Unicode converts */
4628 if (volume_info->iocharset == NULL) {
4629 /* load_nls_default cannot return null */
4630 volume_info->local_nls = load_nls_default();
4632 volume_info->local_nls = load_nls(volume_info->iocharset);
4633 if (volume_info->local_nls == NULL) {
4634 cifs_dbg(VFS, "CIFS mount error: iocharset %s not found\n",
4635 volume_info->iocharset);
4644 cifs_get_volume_info(char *mount_data, const char *devname, bool is_smb3)
4647 struct smb_vol *volume_info;
4649 volume_info = kmalloc(sizeof(struct smb_vol), GFP_KERNEL);
4651 return ERR_PTR(-ENOMEM);
4653 rc = cifs_setup_volume_info(volume_info, mount_data, devname, is_smb3);
4655 cifs_cleanup_volume_info(volume_info);
4656 volume_info = ERR_PTR(rc);
4663 cifs_are_all_path_components_accessible(struct TCP_Server_Info *server,
4665 struct cifs_tcon *tcon,
4666 struct cifs_sb_info *cifs_sb,
4673 int skip = added_treename ? 1 : 0;
4675 sep = CIFS_DIR_SEP(cifs_sb);
4678 rc = server->ops->is_path_accessible(xid, tcon, cifs_sb, "");
4680 /* skip separators */
4685 /* next separator */
4686 while (*s && *s != sep)
4689 * if the treename is added, we then have to skip the first
4690 * part within the separators
4697 * temporarily null-terminate the path at the end of
4698 * the current component
4702 rc = server->ops->is_path_accessible(xid, tcon, cifs_sb,
4710 * Check if path is remote (e.g. a DFS share). Return -EREMOTE if it is,
4713 static int is_path_remote(struct cifs_sb_info *cifs_sb, struct smb_vol *vol,
4714 const unsigned int xid,
4715 struct TCP_Server_Info *server,
4716 struct cifs_tcon *tcon)
4721 if (!server->ops->is_path_accessible)
4725 * cifs_build_path_to_root works only when we have a valid tcon
4727 full_path = cifs_build_path_to_root(vol, cifs_sb, tcon,
4728 tcon->Flags & SMB_SHARE_IS_IN_DFS);
4729 if (full_path == NULL)
4732 cifs_dbg(FYI, "%s: full_path: %s\n", __func__, full_path);
4734 rc = server->ops->is_path_accessible(xid, tcon, cifs_sb,
4736 if (rc != 0 && rc != -EREMOTE) {
4741 if (rc != -EREMOTE) {
4742 rc = cifs_are_all_path_components_accessible(server, xid, tcon,
4743 cifs_sb, full_path, tcon->Flags & SMB_SHARE_IS_IN_DFS);
4745 cifs_server_dbg(VFS, "cannot query dirs between root and final path, "
4746 "enabling CIFS_MOUNT_USE_PREFIX_PATH\n");
4747 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_USE_PREFIX_PATH;
4756 #ifdef CONFIG_CIFS_DFS_UPCALL
4757 static inline void set_root_tcon(struct cifs_sb_info *cifs_sb,
4758 struct cifs_tcon *tcon,
4759 struct cifs_tcon **root)
4761 spin_lock(&cifs_tcp_ses_lock);
4763 tcon->remap = cifs_remap(cifs_sb);
4764 spin_unlock(&cifs_tcp_ses_lock);
4768 int cifs_mount(struct cifs_sb_info *cifs_sb, struct smb_vol *vol)
4772 struct cifs_ses *ses;
4773 struct cifs_tcon *root_tcon = NULL;
4774 struct cifs_tcon *tcon = NULL;
4775 struct TCP_Server_Info *server;
4776 char *root_path = NULL, *full_path = NULL;
4777 char *old_mountdata, *origin_mountdata = NULL;
4780 rc = mount_get_conns(vol, cifs_sb, &xid, &server, &ses, &tcon);
4782 /* If not a standalone DFS root, then check if path is remote */
4783 rc = dfs_cache_find(xid, ses, cifs_sb->local_nls,
4784 cifs_remap(cifs_sb), vol->UNC + 1, NULL,
4787 rc = is_path_remote(cifs_sb, vol, xid, server, tcon);
4795 * If first DFS target server went offline and we failed to connect it,
4796 * server and ses pointers are NULL at this point, though we still have
4797 * chance to get a cached DFS referral in expand_dfs_referral() and
4798 * retry next target available in it.
4800 * If a NULL ses ptr is passed to dfs_cache_find(), a lookup will be
4801 * performed against DFS path and *no* requests will be sent to server
4802 * for any new DFS referrals. Hence it's safe to skip checking whether
4803 * server or ses ptr is NULL.
4805 if (rc == -EACCES || rc == -EOPNOTSUPP)
4808 root_path = build_unc_path_to_root(vol, cifs_sb, false);
4809 if (IS_ERR(root_path)) {
4810 rc = PTR_ERR(root_path);
4815 full_path = build_unc_path_to_root(vol, cifs_sb, true);
4816 if (IS_ERR(full_path)) {
4817 rc = PTR_ERR(full_path);
4822 * Perform an unconditional check for whether there are DFS
4823 * referrals for this path without prefix, to provide support
4824 * for DFS referrals from w2k8 servers which don't seem to respond
4825 * with PATH_NOT_COVERED to requests that include the prefix.
4826 * Chase the referral if found, otherwise continue normally.
4828 old_mountdata = cifs_sb->mountdata;
4829 (void)expand_dfs_referral(xid, ses, vol, cifs_sb, false);
4831 if (cifs_sb->mountdata == NULL) {
4836 /* Save DFS root volume information for DFS refresh worker */
4837 origin_mountdata = kstrndup(cifs_sb->mountdata,
4838 strlen(cifs_sb->mountdata), GFP_KERNEL);
4839 if (!origin_mountdata) {
4844 if (cifs_sb->mountdata != old_mountdata) {
4845 /* If we were redirected, reconnect to new target server */
4846 mount_put_conns(cifs_sb, xid, server, ses, tcon);
4847 rc = mount_get_conns(vol, cifs_sb, &xid, &server, &ses, &tcon);
4850 if (rc == -EACCES || rc == -EOPNOTSUPP)
4852 /* Perform DFS failover to any other DFS targets */
4853 rc = mount_do_dfs_failover(root_path + 1, cifs_sb, vol, NULL,
4854 &xid, &server, &ses, &tcon);
4860 root_path = build_unc_path_to_root(vol, cifs_sb, false);
4861 if (IS_ERR(root_path)) {
4862 rc = PTR_ERR(root_path);
4866 /* Cache out resolved root server */
4867 (void)dfs_cache_find(xid, ses, cifs_sb->local_nls, cifs_remap(cifs_sb),
4868 root_path + 1, NULL, NULL);
4872 set_root_tcon(cifs_sb, tcon, &root_tcon);
4874 for (count = 1; ;) {
4876 rc = is_path_remote(cifs_sb, vol, xid, server, tcon);
4877 if (!rc || rc != -EREMOTE)
4881 * BB: when we implement proper loop detection,
4882 * we will remove this check. But now we need it
4883 * to prevent an indefinite loop if 'DFS tree' is
4884 * misconfigured (i.e. has loops).
4886 if (count++ > MAX_NESTED_LINKS) {
4892 full_path = build_unc_path_to_root(vol, cifs_sb, true);
4893 if (IS_ERR(full_path)) {
4894 rc = PTR_ERR(full_path);
4899 old_mountdata = cifs_sb->mountdata;
4900 rc = expand_dfs_referral(xid, root_tcon->ses, vol, cifs_sb,
4905 if (cifs_sb->mountdata != old_mountdata) {
4906 mount_put_conns(cifs_sb, xid, server, ses, tcon);
4907 rc = mount_get_conns(vol, cifs_sb, &xid, &server, &ses,
4910 * Ensure that DFS referrals go through new root server.
4913 (tcon->share_flags & (SHI1005_FLAGS_DFS |
4914 SHI1005_FLAGS_DFS_ROOT))) {
4915 cifs_put_tcon(root_tcon);
4916 set_root_tcon(cifs_sb, tcon, &root_tcon);
4920 if (rc == -EACCES || rc == -EOPNOTSUPP)
4922 /* Perform DFS failover to any other DFS targets */
4923 rc = mount_do_dfs_failover(full_path + 1, cifs_sb, vol,
4924 root_tcon->ses, &xid,
4925 &server, &ses, &tcon);
4926 if (rc == -EACCES || rc == -EOPNOTSUPP || !server ||
4931 cifs_put_tcon(root_tcon);
4936 spin_lock(&cifs_tcp_ses_lock);
4937 if (!tcon->dfs_path) {
4938 /* Save full path in new tcon to do failover when reconnecting tcons */
4939 tcon->dfs_path = full_path;
4941 tcon->remap = cifs_remap(cifs_sb);
4943 cifs_sb->origin_fullpath = kstrndup(tcon->dfs_path,
4944 strlen(tcon->dfs_path),
4946 if (!cifs_sb->origin_fullpath) {
4947 spin_unlock(&cifs_tcp_ses_lock);
4951 spin_unlock(&cifs_tcp_ses_lock);
4953 rc = dfs_cache_add_vol(origin_mountdata, vol, cifs_sb->origin_fullpath);
4955 kfree(cifs_sb->origin_fullpath);
4959 * After reconnecting to a different server, unique ids won't
4960 * match anymore, so we disable serverino. This prevents
4961 * dentry revalidation to think the dentry are stale (ESTALE).
4963 cifs_autodisable_serverino(cifs_sb);
4965 * Force the use of prefix path to support failover on DFS paths that
4966 * resolve to targets that have different prefix paths.
4968 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_USE_PREFIX_PATH;
4969 kfree(cifs_sb->prepath);
4970 cifs_sb->prepath = vol->prepath;
4971 vol->prepath = NULL;
4975 cifs_try_adding_channels(ses);
4976 return mount_setup_tlink(cifs_sb, ses, tcon);
4981 kfree(origin_mountdata);
4982 mount_put_conns(cifs_sb, xid, server, ses, tcon);
4986 int cifs_mount(struct cifs_sb_info *cifs_sb, struct smb_vol *vol)
4990 struct cifs_ses *ses;
4991 struct cifs_tcon *tcon;
4992 struct TCP_Server_Info *server;
4994 rc = mount_get_conns(vol, cifs_sb, &xid, &server, &ses, &tcon);
4999 rc = is_path_remote(cifs_sb, vol, xid, server, tcon);
5008 return mount_setup_tlink(cifs_sb, ses, tcon);
5011 mount_put_conns(cifs_sb, xid, server, ses, tcon);
5017 * Issue a TREE_CONNECT request.
5020 CIFSTCon(const unsigned int xid, struct cifs_ses *ses,
5021 const char *tree, struct cifs_tcon *tcon,
5022 const struct nls_table *nls_codepage)
5024 struct smb_hdr *smb_buffer;
5025 struct smb_hdr *smb_buffer_response;
5028 unsigned char *bcc_ptr;
5031 __u16 bytes_left, count;
5036 smb_buffer = cifs_buf_get();
5037 if (smb_buffer == NULL)
5040 smb_buffer_response = smb_buffer;
5042 header_assemble(smb_buffer, SMB_COM_TREE_CONNECT_ANDX,
5043 NULL /*no tid */ , 4 /*wct */ );
5045 smb_buffer->Mid = get_next_mid(ses->server);
5046 smb_buffer->Uid = ses->Suid;
5047 pSMB = (TCONX_REQ *) smb_buffer;
5048 pSMBr = (TCONX_RSP *) smb_buffer_response;
5050 pSMB->AndXCommand = 0xFF;
5051 pSMB->Flags = cpu_to_le16(TCON_EXTENDED_SECINFO);
5052 bcc_ptr = &pSMB->Password[0];
5053 if (tcon->pipe || (ses->server->sec_mode & SECMODE_USER)) {
5054 pSMB->PasswordLength = cpu_to_le16(1); /* minimum */
5055 *bcc_ptr = 0; /* password is null byte */
5056 bcc_ptr++; /* skip password */
5057 /* already aligned so no need to do it below */
5059 pSMB->PasswordLength = cpu_to_le16(CIFS_AUTH_RESP_SIZE);
5060 /* BB FIXME add code to fail this if NTLMv2 or Kerberos
5061 specified as required (when that support is added to
5062 the vfs in the future) as only NTLM or the much
5063 weaker LANMAN (which we do not send by default) is accepted
5064 by Samba (not sure whether other servers allow
5065 NTLMv2 password here) */
5066 #ifdef CONFIG_CIFS_WEAK_PW_HASH
5067 if ((global_secflags & CIFSSEC_MAY_LANMAN) &&
5068 (ses->sectype == LANMAN))
5069 calc_lanman_hash(tcon->password, ses->server->cryptkey,
5070 ses->server->sec_mode &
5071 SECMODE_PW_ENCRYPT ? true : false,
5074 #endif /* CIFS_WEAK_PW_HASH */
5075 rc = SMBNTencrypt(tcon->password, ses->server->cryptkey,
5076 bcc_ptr, nls_codepage);
5078 cifs_dbg(FYI, "%s Can't generate NTLM rsp. Error: %d\n",
5080 cifs_buf_release(smb_buffer);
5084 bcc_ptr += CIFS_AUTH_RESP_SIZE;
5085 if (ses->capabilities & CAP_UNICODE) {
5086 /* must align unicode strings */
5087 *bcc_ptr = 0; /* null byte password */
5092 if (ses->server->sign)
5093 smb_buffer->Flags2 |= SMBFLG2_SECURITY_SIGNATURE;
5095 if (ses->capabilities & CAP_STATUS32) {
5096 smb_buffer->Flags2 |= SMBFLG2_ERR_STATUS;
5098 if (ses->capabilities & CAP_DFS) {
5099 smb_buffer->Flags2 |= SMBFLG2_DFS;
5101 if (ses->capabilities & CAP_UNICODE) {
5102 smb_buffer->Flags2 |= SMBFLG2_UNICODE;
5104 cifs_strtoUTF16((__le16 *) bcc_ptr, tree,
5105 6 /* max utf8 char length in bytes */ *
5106 (/* server len*/ + 256 /* share len */), nls_codepage);
5107 bcc_ptr += 2 * length; /* convert num 16 bit words to bytes */
5108 bcc_ptr += 2; /* skip trailing null */
5109 } else { /* ASCII */
5110 strcpy(bcc_ptr, tree);
5111 bcc_ptr += strlen(tree) + 1;
5113 strcpy(bcc_ptr, "?????");
5114 bcc_ptr += strlen("?????");
5116 count = bcc_ptr - &pSMB->Password[0];
5117 pSMB->hdr.smb_buf_length = cpu_to_be32(be32_to_cpu(
5118 pSMB->hdr.smb_buf_length) + count);
5119 pSMB->ByteCount = cpu_to_le16(count);
5121 rc = SendReceive(xid, ses, smb_buffer, smb_buffer_response, &length,
5124 /* above now done in SendReceive */
5128 tcon->tidStatus = CifsGood;
5129 tcon->need_reconnect = false;
5130 tcon->tid = smb_buffer_response->Tid;
5131 bcc_ptr = pByteArea(smb_buffer_response);
5132 bytes_left = get_bcc(smb_buffer_response);
5133 length = strnlen(bcc_ptr, bytes_left - 2);
5134 if (smb_buffer->Flags2 & SMBFLG2_UNICODE)
5140 /* skip service field (NB: this field is always ASCII) */
5142 if ((bcc_ptr[0] == 'I') && (bcc_ptr[1] == 'P') &&
5143 (bcc_ptr[2] == 'C')) {
5144 cifs_dbg(FYI, "IPC connection\n");
5148 } else if (length == 2) {
5149 if ((bcc_ptr[0] == 'A') && (bcc_ptr[1] == ':')) {
5150 /* the most common case */
5151 cifs_dbg(FYI, "disk share connection\n");
5154 bcc_ptr += length + 1;
5155 bytes_left -= (length + 1);
5156 strlcpy(tcon->treeName, tree, sizeof(tcon->treeName));
5158 /* mostly informational -- no need to fail on error here */
5159 kfree(tcon->nativeFileSystem);
5160 tcon->nativeFileSystem = cifs_strndup_from_utf16(bcc_ptr,
5161 bytes_left, is_unicode,
5164 cifs_dbg(FYI, "nativeFileSystem=%s\n", tcon->nativeFileSystem);
5166 if ((smb_buffer_response->WordCount == 3) ||
5167 (smb_buffer_response->WordCount == 7))
5168 /* field is in same location */
5169 tcon->Flags = le16_to_cpu(pSMBr->OptionalSupport);
5172 cifs_dbg(FYI, "Tcon flags: 0x%x\n", tcon->Flags);
5175 cifs_buf_release(smb_buffer);
5179 static void delayed_free(struct rcu_head *p)
5181 struct cifs_sb_info *sbi = container_of(p, struct cifs_sb_info, rcu);
5182 unload_nls(sbi->local_nls);
5187 cifs_umount(struct cifs_sb_info *cifs_sb)
5189 struct rb_root *root = &cifs_sb->tlink_tree;
5190 struct rb_node *node;
5191 struct tcon_link *tlink;
5193 cancel_delayed_work_sync(&cifs_sb->prune_tlinks);
5195 spin_lock(&cifs_sb->tlink_tree_lock);
5196 while ((node = rb_first(root))) {
5197 tlink = rb_entry(node, struct tcon_link, tl_rbnode);
5198 cifs_get_tlink(tlink);
5199 clear_bit(TCON_LINK_IN_TREE, &tlink->tl_flags);
5200 rb_erase(node, root);
5202 spin_unlock(&cifs_sb->tlink_tree_lock);
5203 cifs_put_tlink(tlink);
5204 spin_lock(&cifs_sb->tlink_tree_lock);
5206 spin_unlock(&cifs_sb->tlink_tree_lock);
5208 kfree(cifs_sb->mountdata);
5209 kfree(cifs_sb->prepath);
5210 #ifdef CONFIG_CIFS_DFS_UPCALL
5211 dfs_cache_del_vol(cifs_sb->origin_fullpath);
5212 kfree(cifs_sb->origin_fullpath);
5214 call_rcu(&cifs_sb->rcu, delayed_free);
5218 cifs_negotiate_protocol(const unsigned int xid, struct cifs_ses *ses)
5221 struct TCP_Server_Info *server = cifs_ses_server(ses);
5223 if (!server->ops->need_neg || !server->ops->negotiate)
5226 /* only send once per connect */
5227 if (!server->ops->need_neg(server))
5230 rc = server->ops->negotiate(xid, ses);
5232 spin_lock(&GlobalMid_Lock);
5233 if (server->tcpStatus == CifsNeedNegotiate)
5234 server->tcpStatus = CifsGood;
5237 spin_unlock(&GlobalMid_Lock);
5244 cifs_setup_session(const unsigned int xid, struct cifs_ses *ses,
5245 struct nls_table *nls_info)
5248 struct TCP_Server_Info *server = cifs_ses_server(ses);
5250 if (!ses->binding) {
5251 ses->capabilities = server->capabilities;
5252 if (linuxExtEnabled == 0)
5253 ses->capabilities &= (~server->vals->cap_unix);
5255 if (ses->auth_key.response) {
5256 cifs_dbg(FYI, "Free previous auth_key.response = %p\n",
5257 ses->auth_key.response);
5258 kfree(ses->auth_key.response);
5259 ses->auth_key.response = NULL;
5260 ses->auth_key.len = 0;
5264 cifs_dbg(FYI, "Security Mode: 0x%x Capabilities: 0x%x TimeAdjust: %d\n",
5265 server->sec_mode, server->capabilities, server->timeAdj);
5267 if (server->ops->sess_setup)
5268 rc = server->ops->sess_setup(xid, ses, nls_info);
5271 cifs_server_dbg(VFS, "Send error in SessSetup = %d\n", rc);
5277 cifs_set_vol_auth(struct smb_vol *vol, struct cifs_ses *ses)
5279 vol->sectype = ses->sectype;
5281 /* krb5 is special, since we don't need username or pw */
5282 if (vol->sectype == Kerberos)
5285 return cifs_set_cifscreds(vol, ses);
5288 static struct cifs_tcon *
5289 cifs_construct_tcon(struct cifs_sb_info *cifs_sb, kuid_t fsuid)
5292 struct cifs_tcon *master_tcon = cifs_sb_master_tcon(cifs_sb);
5293 struct cifs_ses *ses;
5294 struct cifs_tcon *tcon = NULL;
5295 struct smb_vol *vol_info;
5297 vol_info = kzalloc(sizeof(*vol_info), GFP_KERNEL);
5298 if (vol_info == NULL)
5299 return ERR_PTR(-ENOMEM);
5301 vol_info->local_nls = cifs_sb->local_nls;
5302 vol_info->linux_uid = fsuid;
5303 vol_info->cred_uid = fsuid;
5304 vol_info->UNC = master_tcon->treeName;
5305 vol_info->retry = master_tcon->retry;
5306 vol_info->nocase = master_tcon->nocase;
5307 vol_info->nohandlecache = master_tcon->nohandlecache;
5308 vol_info->local_lease = master_tcon->local_lease;
5309 vol_info->no_linux_ext = !master_tcon->unix_ext;
5310 vol_info->sectype = master_tcon->ses->sectype;
5311 vol_info->sign = master_tcon->ses->sign;
5313 rc = cifs_set_vol_auth(vol_info, master_tcon->ses);
5319 /* get a reference for the same TCP session */
5320 spin_lock(&cifs_tcp_ses_lock);
5321 ++master_tcon->ses->server->srv_count;
5322 spin_unlock(&cifs_tcp_ses_lock);
5324 ses = cifs_get_smb_ses(master_tcon->ses->server, vol_info);
5326 tcon = (struct cifs_tcon *)ses;
5327 cifs_put_tcp_session(master_tcon->ses->server, 0);
5331 tcon = cifs_get_tcon(ses, vol_info);
5333 cifs_put_smb_ses(ses);
5337 /* if new SMB3.11 POSIX extensions are supported do not remap / and \ */
5338 if (tcon->posix_extensions)
5339 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_POSIX_PATHS;
5342 reset_cifs_unix_caps(0, tcon, NULL, vol_info);
5345 kfree(vol_info->username);
5346 kzfree(vol_info->password);
5353 cifs_sb_master_tcon(struct cifs_sb_info *cifs_sb)
5355 return tlink_tcon(cifs_sb_master_tlink(cifs_sb));
5358 /* find and return a tlink with given uid */
5359 static struct tcon_link *
5360 tlink_rb_search(struct rb_root *root, kuid_t uid)
5362 struct rb_node *node = root->rb_node;
5363 struct tcon_link *tlink;
5366 tlink = rb_entry(node, struct tcon_link, tl_rbnode);
5368 if (uid_gt(tlink->tl_uid, uid))
5369 node = node->rb_left;
5370 else if (uid_lt(tlink->tl_uid, uid))
5371 node = node->rb_right;
5378 /* insert a tcon_link into the tree */
5380 tlink_rb_insert(struct rb_root *root, struct tcon_link *new_tlink)
5382 struct rb_node **new = &(root->rb_node), *parent = NULL;
5383 struct tcon_link *tlink;
5386 tlink = rb_entry(*new, struct tcon_link, tl_rbnode);
5389 if (uid_gt(tlink->tl_uid, new_tlink->tl_uid))
5390 new = &((*new)->rb_left);
5392 new = &((*new)->rb_right);
5395 rb_link_node(&new_tlink->tl_rbnode, parent, new);
5396 rb_insert_color(&new_tlink->tl_rbnode, root);
5400 * Find or construct an appropriate tcon given a cifs_sb and the fsuid of the
5403 * If the superblock doesn't refer to a multiuser mount, then just return
5404 * the master tcon for the mount.
5406 * First, search the rbtree for an existing tcon for this fsuid. If one
5407 * exists, then check to see if it's pending construction. If it is then wait
5408 * for construction to complete. Once it's no longer pending, check to see if
5409 * it failed and either return an error or retry construction, depending on
5412 * If one doesn't exist then insert a new tcon_link struct into the tree and
5413 * try to construct a new one.
5416 cifs_sb_tlink(struct cifs_sb_info *cifs_sb)
5419 kuid_t fsuid = current_fsuid();
5420 struct tcon_link *tlink, *newtlink;
5422 if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MULTIUSER))
5423 return cifs_get_tlink(cifs_sb_master_tlink(cifs_sb));
5425 spin_lock(&cifs_sb->tlink_tree_lock);
5426 tlink = tlink_rb_search(&cifs_sb->tlink_tree, fsuid);
5428 cifs_get_tlink(tlink);
5429 spin_unlock(&cifs_sb->tlink_tree_lock);
5431 if (tlink == NULL) {
5432 newtlink = kzalloc(sizeof(*tlink), GFP_KERNEL);
5433 if (newtlink == NULL)
5434 return ERR_PTR(-ENOMEM);
5435 newtlink->tl_uid = fsuid;
5436 newtlink->tl_tcon = ERR_PTR(-EACCES);
5437 set_bit(TCON_LINK_PENDING, &newtlink->tl_flags);
5438 set_bit(TCON_LINK_IN_TREE, &newtlink->tl_flags);
5439 cifs_get_tlink(newtlink);
5441 spin_lock(&cifs_sb->tlink_tree_lock);
5442 /* was one inserted after previous search? */
5443 tlink = tlink_rb_search(&cifs_sb->tlink_tree, fsuid);
5445 cifs_get_tlink(tlink);
5446 spin_unlock(&cifs_sb->tlink_tree_lock);
5448 goto wait_for_construction;
5451 tlink_rb_insert(&cifs_sb->tlink_tree, tlink);
5452 spin_unlock(&cifs_sb->tlink_tree_lock);
5454 wait_for_construction:
5455 ret = wait_on_bit(&tlink->tl_flags, TCON_LINK_PENDING,
5456 TASK_INTERRUPTIBLE);
5458 cifs_put_tlink(tlink);
5459 return ERR_PTR(-ERESTARTSYS);
5462 /* if it's good, return it */
5463 if (!IS_ERR(tlink->tl_tcon))
5466 /* return error if we tried this already recently */
5467 if (time_before(jiffies, tlink->tl_time + TLINK_ERROR_EXPIRE)) {
5468 cifs_put_tlink(tlink);
5469 return ERR_PTR(-EACCES);
5472 if (test_and_set_bit(TCON_LINK_PENDING, &tlink->tl_flags))
5473 goto wait_for_construction;
5476 tlink->tl_tcon = cifs_construct_tcon(cifs_sb, fsuid);
5477 clear_bit(TCON_LINK_PENDING, &tlink->tl_flags);
5478 wake_up_bit(&tlink->tl_flags, TCON_LINK_PENDING);
5480 if (IS_ERR(tlink->tl_tcon)) {
5481 cifs_put_tlink(tlink);
5482 return ERR_PTR(-EACCES);
5489 * periodic workqueue job that scans tcon_tree for a superblock and closes
5493 cifs_prune_tlinks(struct work_struct *work)
5495 struct cifs_sb_info *cifs_sb = container_of(work, struct cifs_sb_info,
5497 struct rb_root *root = &cifs_sb->tlink_tree;
5498 struct rb_node *node;
5499 struct rb_node *tmp;
5500 struct tcon_link *tlink;
5503 * Because we drop the spinlock in the loop in order to put the tlink
5504 * it's not guarded against removal of links from the tree. The only
5505 * places that remove entries from the tree are this function and
5506 * umounts. Because this function is non-reentrant and is canceled
5507 * before umount can proceed, this is safe.
5509 spin_lock(&cifs_sb->tlink_tree_lock);
5510 node = rb_first(root);
5511 while (node != NULL) {
5513 node = rb_next(tmp);
5514 tlink = rb_entry(tmp, struct tcon_link, tl_rbnode);
5516 if (test_bit(TCON_LINK_MASTER, &tlink->tl_flags) ||
5517 atomic_read(&tlink->tl_count) != 0 ||
5518 time_after(tlink->tl_time + TLINK_IDLE_EXPIRE, jiffies))
5521 cifs_get_tlink(tlink);
5522 clear_bit(TCON_LINK_IN_TREE, &tlink->tl_flags);
5523 rb_erase(tmp, root);
5525 spin_unlock(&cifs_sb->tlink_tree_lock);
5526 cifs_put_tlink(tlink);
5527 spin_lock(&cifs_sb->tlink_tree_lock);
5529 spin_unlock(&cifs_sb->tlink_tree_lock);
5531 queue_delayed_work(cifsiod_wq, &cifs_sb->prune_tlinks,