1 // SPDX-License-Identifier: LGPL-2.1
4 * Copyright (C) International Business Machines Corp., 2002,2011
5 * Author(s): Steve French (sfrench@us.ibm.com)
10 #include <linux/string.h>
11 #include <linux/sched/mm.h>
12 #include <linux/sched/signal.h>
13 #include <linux/list.h>
14 #include <linux/wait.h>
15 #include <linux/slab.h>
16 #include <linux/pagemap.h>
17 #include <linux/ctype.h>
18 #include <linux/utsname.h>
19 #include <linux/mempool.h>
20 #include <linux/delay.h>
21 #include <linux/completion.h>
22 #include <linux/kthread.h>
23 #include <linux/pagevec.h>
24 #include <linux/freezer.h>
25 #include <linux/namei.h>
26 #include <linux/uuid.h>
27 #include <linux/uaccess.h>
28 #include <asm/processor.h>
29 #include <linux/inet.h>
30 #include <linux/module.h>
31 #include <keys/user-type.h>
33 #include <linux/parser.h>
34 #include <linux/bvec.h>
37 #include "cifsproto.h"
38 #include "cifs_unicode.h"
39 #include "cifs_debug.h"
40 #include "cifs_fs_sb.h"
43 #include "rfc1002pdu.h"
45 #include "smb2proto.h"
46 #include "smbdirect.h"
47 #include "dns_resolve.h"
48 #ifdef CONFIG_CIFS_DFS_UPCALL
49 #include "dfs_cache.h"
51 #include "fs_context.h"
54 extern mempool_t
*cifs_req_poolp
;
55 extern bool disable_legacy_dialects
;
57 /* FIXME: should these be tunable? */
58 #define TLINK_ERROR_EXPIRE (1 * HZ)
59 #define TLINK_IDLE_EXPIRE (600 * HZ)
61 /* Drop the connection to not overload the server */
62 #define NUM_STATUS_IO_TIMEOUT 5
64 static int ip_connect(struct TCP_Server_Info
*server
);
65 static int generic_ip_connect(struct TCP_Server_Info
*server
);
66 static void tlink_rb_insert(struct rb_root
*root
, struct tcon_link
*new_tlink
);
67 static void cifs_prune_tlinks(struct work_struct
*work
);
70 * Resolve hostname and set ip addr in tcp ses. Useful for hostnames that may
71 * get their ip addresses changed at some point.
73 * This should be called with server->srv_mutex held.
75 static int reconn_set_ipaddr_from_hostname(struct TCP_Server_Info
*server
)
79 char *unc
, *ipaddr
= NULL
;
81 unsigned long ttl
= SMB_DNS_RESOLVE_INTERVAL_DEFAULT
;
83 if (!server
->hostname
)
86 len
= strlen(server
->hostname
) + 3;
88 unc
= kmalloc(len
, GFP_KERNEL
);
90 cifs_dbg(FYI
, "%s: failed to create UNC path\n", __func__
);
93 scnprintf(unc
, len
, "\\\\%s", server
->hostname
);
95 rc
= dns_resolve_server_name_to_ip(unc
, &ipaddr
, &expiry
);
99 cifs_dbg(FYI
, "%s: failed to resolve server part of %s to IP: %d\n",
100 __func__
, server
->hostname
, rc
);
101 goto requeue_resolve
;
104 spin_lock(&cifs_tcp_ses_lock
);
105 rc
= cifs_convert_address((struct sockaddr
*)&server
->dstaddr
, ipaddr
,
107 spin_unlock(&cifs_tcp_ses_lock
);
110 /* rc == 1 means success here */
112 now
= ktime_get_real_seconds();
113 if (expiry
&& expiry
> now
)
115 * To make sure we don't use the cached entry, retry 1s
118 ttl
= max_t(unsigned long, expiry
- now
, SMB_DNS_RESOLVE_INTERVAL_MIN
) + 1;
123 cifs_dbg(FYI
, "%s: next dns resolution scheduled for %lu seconds in the future\n",
125 mod_delayed_work(cifsiod_wq
, &server
->resolve
, (ttl
* HZ
));
131 static void cifs_resolve_server(struct work_struct
*work
)
134 struct TCP_Server_Info
*server
= container_of(work
,
135 struct TCP_Server_Info
, resolve
.work
);
137 mutex_lock(&server
->srv_mutex
);
140 * Resolve the hostname again to make sure that IP address is up-to-date.
142 rc
= reconn_set_ipaddr_from_hostname(server
);
144 cifs_dbg(FYI
, "%s: failed to resolve hostname: %d\n",
148 mutex_unlock(&server
->srv_mutex
);
151 #ifdef CONFIG_CIFS_DFS_UPCALL
152 /* These functions must be called with server->srv_mutex held */
153 static void reconn_set_next_dfs_target(struct TCP_Server_Info
*server
,
154 struct cifs_sb_info
*cifs_sb
,
155 struct dfs_cache_tgt_list
*tgt_list
,
156 struct dfs_cache_tgt_iterator
**tgt_it
)
161 if (!cifs_sb
|| !cifs_sb
->origin_fullpath
)
165 *tgt_it
= dfs_cache_get_tgt_iterator(tgt_list
);
167 *tgt_it
= dfs_cache_get_next_tgt(tgt_list
, *tgt_it
);
169 *tgt_it
= dfs_cache_get_tgt_iterator(tgt_list
);
172 cifs_dbg(FYI
, "%s: UNC: %s\n", __func__
, cifs_sb
->origin_fullpath
);
174 name
= dfs_cache_get_tgt_name(*tgt_it
);
176 kfree(server
->hostname
);
178 server
->hostname
= extract_hostname(name
);
179 if (IS_ERR(server
->hostname
)) {
181 "%s: failed to extract hostname from target: %ld\n",
182 __func__
, PTR_ERR(server
->hostname
));
186 rc
= reconn_set_ipaddr_from_hostname(server
);
188 cifs_dbg(FYI
, "%s: failed to resolve hostname: %d\n",
193 static inline int reconn_setup_dfs_targets(struct cifs_sb_info
*cifs_sb
,
194 struct dfs_cache_tgt_list
*tl
)
196 if (!cifs_sb
->origin_fullpath
)
198 return dfs_cache_noreq_find(cifs_sb
->origin_fullpath
+ 1, NULL
, tl
);
203 * cifs tcp session reconnection
205 * mark tcp session as reconnecting so temporarily locked
206 * mark all smb sessions as reconnecting for tcp session
207 * reconnect tcp session
208 * wake up waiters on reconnection? - (not needed currently)
211 cifs_reconnect(struct TCP_Server_Info
*server
)
214 struct list_head
*tmp
, *tmp2
;
215 struct cifs_ses
*ses
;
216 struct cifs_tcon
*tcon
;
217 struct mid_q_entry
*mid_entry
;
218 struct list_head retry_list
;
219 #ifdef CONFIG_CIFS_DFS_UPCALL
220 struct super_block
*sb
= NULL
;
221 struct cifs_sb_info
*cifs_sb
= NULL
;
222 struct dfs_cache_tgt_list tgt_list
= DFS_CACHE_TGT_LIST_INIT(tgt_list
);
223 struct dfs_cache_tgt_iterator
*tgt_it
= NULL
;
226 spin_lock(&GlobalMid_Lock
);
227 server
->nr_targets
= 1;
228 #ifdef CONFIG_CIFS_DFS_UPCALL
229 spin_unlock(&GlobalMid_Lock
);
230 sb
= cifs_get_tcp_super(server
);
233 cifs_dbg(FYI
, "%s: will not do DFS failover: rc = %d\n",
237 cifs_sb
= CIFS_SB(sb
);
238 rc
= reconn_setup_dfs_targets(cifs_sb
, &tgt_list
);
241 if (rc
!= -EOPNOTSUPP
) {
242 cifs_server_dbg(VFS
, "%s: no target servers for DFS failover\n",
246 server
->nr_targets
= dfs_cache_get_nr_tgts(&tgt_list
);
249 cifs_dbg(FYI
, "%s: will retry %d target(s)\n", __func__
,
251 spin_lock(&GlobalMid_Lock
);
253 if (server
->tcpStatus
== CifsExiting
) {
254 /* the demux thread will exit normally
255 next time through the loop */
256 spin_unlock(&GlobalMid_Lock
);
257 #ifdef CONFIG_CIFS_DFS_UPCALL
258 dfs_cache_free_tgts(&tgt_list
);
259 cifs_put_tcp_super(sb
);
261 wake_up(&server
->response_q
);
264 server
->tcpStatus
= CifsNeedReconnect
;
265 spin_unlock(&GlobalMid_Lock
);
267 server
->max_read
= 0;
269 cifs_dbg(FYI
, "Mark tcp session as need reconnect\n");
270 trace_smb3_reconnect(server
->CurrentMid
, server
->conn_id
, server
->hostname
);
272 /* before reconnecting the tcp session, mark the smb session (uid)
273 and the tid bad so they are not used until reconnected */
274 cifs_dbg(FYI
, "%s: marking sessions and tcons for reconnect\n",
276 spin_lock(&cifs_tcp_ses_lock
);
277 list_for_each(tmp
, &server
->smb_ses_list
) {
278 ses
= list_entry(tmp
, struct cifs_ses
, smb_ses_list
);
279 ses
->need_reconnect
= true;
280 list_for_each(tmp2
, &ses
->tcon_list
) {
281 tcon
= list_entry(tmp2
, struct cifs_tcon
, tcon_list
);
282 tcon
->need_reconnect
= true;
285 ses
->tcon_ipc
->need_reconnect
= true;
287 spin_unlock(&cifs_tcp_ses_lock
);
289 /* do not want to be sending data on a socket we are freeing */
290 cifs_dbg(FYI
, "%s: tearing down socket\n", __func__
);
291 mutex_lock(&server
->srv_mutex
);
292 if (server
->ssocket
) {
293 cifs_dbg(FYI
, "State: 0x%x Flags: 0x%lx\n",
294 server
->ssocket
->state
, server
->ssocket
->flags
);
295 kernel_sock_shutdown(server
->ssocket
, SHUT_WR
);
296 cifs_dbg(FYI
, "Post shutdown state: 0x%x Flags: 0x%lx\n",
297 server
->ssocket
->state
, server
->ssocket
->flags
);
298 sock_release(server
->ssocket
);
299 server
->ssocket
= NULL
;
301 server
->sequence_number
= 0;
302 server
->session_estab
= false;
303 kfree(server
->session_key
.response
);
304 server
->session_key
.response
= NULL
;
305 server
->session_key
.len
= 0;
306 server
->lstrp
= jiffies
;
308 /* mark submitted MIDs for retry and issue callback */
309 INIT_LIST_HEAD(&retry_list
);
310 cifs_dbg(FYI
, "%s: moving mids to private list\n", __func__
);
311 spin_lock(&GlobalMid_Lock
);
312 list_for_each_safe(tmp
, tmp2
, &server
->pending_mid_q
) {
313 mid_entry
= list_entry(tmp
, struct mid_q_entry
, qhead
);
314 kref_get(&mid_entry
->refcount
);
315 if (mid_entry
->mid_state
== MID_REQUEST_SUBMITTED
)
316 mid_entry
->mid_state
= MID_RETRY_NEEDED
;
317 list_move(&mid_entry
->qhead
, &retry_list
);
318 mid_entry
->mid_flags
|= MID_DELETED
;
320 spin_unlock(&GlobalMid_Lock
);
321 mutex_unlock(&server
->srv_mutex
);
323 cifs_dbg(FYI
, "%s: issuing mid callbacks\n", __func__
);
324 list_for_each_safe(tmp
, tmp2
, &retry_list
) {
325 mid_entry
= list_entry(tmp
, struct mid_q_entry
, qhead
);
326 list_del_init(&mid_entry
->qhead
);
327 mid_entry
->callback(mid_entry
);
328 cifs_mid_q_entry_release(mid_entry
);
331 if (cifs_rdma_enabled(server
)) {
332 mutex_lock(&server
->srv_mutex
);
333 smbd_destroy(server
);
334 mutex_unlock(&server
->srv_mutex
);
340 mutex_lock(&server
->srv_mutex
);
343 if (!cifs_swn_set_server_dstaddr(server
)) {
344 #ifdef CONFIG_CIFS_DFS_UPCALL
345 if (cifs_sb
&& cifs_sb
->origin_fullpath
)
347 * Set up next DFS target server (if any) for reconnect. If DFS
348 * feature is disabled, then we will retry last server we
349 * connected to before.
351 reconn_set_next_dfs_target(server
, cifs_sb
, &tgt_list
, &tgt_it
);
355 * Resolve the hostname again to make sure that IP address is up-to-date.
357 rc
= reconn_set_ipaddr_from_hostname(server
);
359 cifs_dbg(FYI
, "%s: failed to resolve hostname: %d\n",
363 #ifdef CONFIG_CIFS_DFS_UPCALL
370 if (cifs_rdma_enabled(server
))
371 rc
= smbd_reconnect(server
);
373 rc
= generic_ip_connect(server
);
375 cifs_dbg(FYI
, "reconnect error %d\n", rc
);
376 mutex_unlock(&server
->srv_mutex
);
379 atomic_inc(&tcpSesReconnectCount
);
380 set_credits(server
, 1);
381 spin_lock(&GlobalMid_Lock
);
382 if (server
->tcpStatus
!= CifsExiting
)
383 server
->tcpStatus
= CifsNeedNegotiate
;
384 spin_unlock(&GlobalMid_Lock
);
385 cifs_swn_reset_server_dstaddr(server
);
386 mutex_unlock(&server
->srv_mutex
);
388 } while (server
->tcpStatus
== CifsNeedReconnect
);
390 #ifdef CONFIG_CIFS_DFS_UPCALL
392 rc
= dfs_cache_noreq_update_tgthint(cifs_sb
->origin_fullpath
+ 1,
395 cifs_server_dbg(VFS
, "%s: failed to update DFS target hint: rc = %d\n",
398 dfs_cache_free_tgts(&tgt_list
);
401 cifs_put_tcp_super(sb
);
403 if (server
->tcpStatus
== CifsNeedNegotiate
)
404 mod_delayed_work(cifsiod_wq
, &server
->echo
, 0);
406 wake_up(&server
->response_q
);
411 cifs_echo_request(struct work_struct
*work
)
414 struct TCP_Server_Info
*server
= container_of(work
,
415 struct TCP_Server_Info
, echo
.work
);
418 * We cannot send an echo if it is disabled.
419 * Also, no need to ping if we got a response recently.
422 if (server
->tcpStatus
== CifsNeedReconnect
||
423 server
->tcpStatus
== CifsExiting
||
424 server
->tcpStatus
== CifsNew
||
425 (server
->ops
->can_echo
&& !server
->ops
->can_echo(server
)) ||
426 time_before(jiffies
, server
->lstrp
+ server
->echo_interval
- HZ
))
429 rc
= server
->ops
->echo
? server
->ops
->echo(server
) : -ENOSYS
;
431 cifs_dbg(FYI
, "Unable to send echo request to server: %s\n",
434 /* Check witness registrations */
438 queue_delayed_work(cifsiod_wq
, &server
->echo
, server
->echo_interval
);
442 allocate_buffers(struct TCP_Server_Info
*server
)
444 if (!server
->bigbuf
) {
445 server
->bigbuf
= (char *)cifs_buf_get();
446 if (!server
->bigbuf
) {
447 cifs_server_dbg(VFS
, "No memory for large SMB response\n");
449 /* retry will check if exiting */
452 } else if (server
->large_buf
) {
453 /* we are reusing a dirty large buf, clear its start */
454 memset(server
->bigbuf
, 0, HEADER_SIZE(server
));
457 if (!server
->smallbuf
) {
458 server
->smallbuf
= (char *)cifs_small_buf_get();
459 if (!server
->smallbuf
) {
460 cifs_server_dbg(VFS
, "No memory for SMB response\n");
462 /* retry will check if exiting */
465 /* beginning of smb buffer is cleared in our buf_get */
467 /* if existing small buf clear beginning */
468 memset(server
->smallbuf
, 0, HEADER_SIZE(server
));
475 server_unresponsive(struct TCP_Server_Info
*server
)
478 * We need to wait 3 echo intervals to make sure we handle such
480 * 1s client sends a normal SMB request
481 * 2s client gets a response
482 * 30s echo workqueue job pops, and decides we got a response recently
483 * and don't need to send another
485 * 65s kernel_recvmsg times out, and we see that we haven't gotten
486 * a response in >60s.
488 if ((server
->tcpStatus
== CifsGood
||
489 server
->tcpStatus
== CifsNeedNegotiate
) &&
490 (!server
->ops
->can_echo
|| server
->ops
->can_echo(server
)) &&
491 time_after(jiffies
, server
->lstrp
+ 3 * server
->echo_interval
)) {
492 cifs_server_dbg(VFS
, "has not responded in %lu seconds. Reconnecting...\n",
493 (3 * server
->echo_interval
) / HZ
);
494 cifs_reconnect(server
);
502 zero_credits(struct TCP_Server_Info
*server
)
506 spin_lock(&server
->req_lock
);
507 val
= server
->credits
+ server
->echo_credits
+ server
->oplock_credits
;
508 if (server
->in_flight
== 0 && val
== 0) {
509 spin_unlock(&server
->req_lock
);
512 spin_unlock(&server
->req_lock
);
517 cifs_readv_from_socket(struct TCP_Server_Info
*server
, struct msghdr
*smb_msg
)
522 smb_msg
->msg_control
= NULL
;
523 smb_msg
->msg_controllen
= 0;
525 for (total_read
= 0; msg_data_left(smb_msg
); total_read
+= length
) {
528 /* reconnect if no credits and no requests in flight */
529 if (zero_credits(server
)) {
530 cifs_reconnect(server
);
531 return -ECONNABORTED
;
534 if (server_unresponsive(server
))
535 return -ECONNABORTED
;
536 if (cifs_rdma_enabled(server
) && server
->smbd_conn
)
537 length
= smbd_recv(server
->smbd_conn
, smb_msg
);
539 length
= sock_recvmsg(server
->ssocket
, smb_msg
, 0);
541 if (server
->tcpStatus
== CifsExiting
)
544 if (server
->tcpStatus
== CifsNeedReconnect
) {
545 cifs_reconnect(server
);
546 return -ECONNABORTED
;
549 if (length
== -ERESTARTSYS
||
553 * Minimum sleep to prevent looping, allowing socket
554 * to clear and app threads to set tcpStatus
555 * CifsNeedReconnect if server hung.
557 usleep_range(1000, 2000);
563 cifs_dbg(FYI
, "Received no data or error: %d\n", length
);
564 cifs_reconnect(server
);
565 return -ECONNABORTED
;
572 cifs_read_from_socket(struct TCP_Server_Info
*server
, char *buf
,
573 unsigned int to_read
)
575 struct msghdr smb_msg
;
576 struct kvec iov
= {.iov_base
= buf
, .iov_len
= to_read
};
577 iov_iter_kvec(&smb_msg
.msg_iter
, READ
, &iov
, 1, to_read
);
579 return cifs_readv_from_socket(server
, &smb_msg
);
583 cifs_discard_from_socket(struct TCP_Server_Info
*server
, size_t to_read
)
585 struct msghdr smb_msg
;
588 * iov_iter_discard already sets smb_msg.type and count and iov_offset
589 * and cifs_readv_from_socket sets msg_control and msg_controllen
590 * so little to initialize in struct msghdr
592 smb_msg
.msg_name
= NULL
;
593 smb_msg
.msg_namelen
= 0;
594 iov_iter_discard(&smb_msg
.msg_iter
, READ
, to_read
);
596 return cifs_readv_from_socket(server
, &smb_msg
);
600 cifs_read_page_from_socket(struct TCP_Server_Info
*server
, struct page
*page
,
601 unsigned int page_offset
, unsigned int to_read
)
603 struct msghdr smb_msg
;
604 struct bio_vec bv
= {
605 .bv_page
= page
, .bv_len
= to_read
, .bv_offset
= page_offset
};
606 iov_iter_bvec(&smb_msg
.msg_iter
, READ
, &bv
, 1, to_read
);
607 return cifs_readv_from_socket(server
, &smb_msg
);
611 is_smb_response(struct TCP_Server_Info
*server
, unsigned char type
)
614 * The first byte big endian of the length field,
615 * is actually not part of the length but the type
616 * with the most common, zero, as regular data.
619 case RFC1002_SESSION_MESSAGE
:
620 /* Regular SMB response */
622 case RFC1002_SESSION_KEEP_ALIVE
:
623 cifs_dbg(FYI
, "RFC 1002 session keep alive\n");
625 case RFC1002_POSITIVE_SESSION_RESPONSE
:
626 cifs_dbg(FYI
, "RFC 1002 positive session response\n");
628 case RFC1002_NEGATIVE_SESSION_RESPONSE
:
630 * We get this from Windows 98 instead of an error on
631 * SMB negprot response.
633 cifs_dbg(FYI
, "RFC 1002 negative session response\n");
634 /* give server a second to clean up */
637 * Always try 445 first on reconnect since we get NACK
638 * on some if we ever connected to port 139 (the NACK
639 * is since we do not begin with RFC1001 session
642 cifs_set_port((struct sockaddr
*)&server
->dstaddr
, CIFS_PORT
);
643 cifs_reconnect(server
);
646 cifs_server_dbg(VFS
, "RFC 1002 unknown response type 0x%x\n", type
);
647 cifs_reconnect(server
);
654 dequeue_mid(struct mid_q_entry
*mid
, bool malformed
)
656 #ifdef CONFIG_CIFS_STATS2
657 mid
->when_received
= jiffies
;
659 spin_lock(&GlobalMid_Lock
);
661 mid
->mid_state
= MID_RESPONSE_RECEIVED
;
663 mid
->mid_state
= MID_RESPONSE_MALFORMED
;
665 * Trying to handle/dequeue a mid after the send_recv()
666 * function has finished processing it is a bug.
668 if (mid
->mid_flags
& MID_DELETED
)
669 pr_warn_once("trying to dequeue a deleted mid\n");
671 list_del_init(&mid
->qhead
);
672 mid
->mid_flags
|= MID_DELETED
;
674 spin_unlock(&GlobalMid_Lock
);
678 smb2_get_credits_from_hdr(char *buffer
, struct TCP_Server_Info
*server
)
680 struct smb2_sync_hdr
*shdr
= (struct smb2_sync_hdr
*)buffer
;
683 * SMB1 does not use credits.
685 if (server
->vals
->header_preamble_size
)
688 return le16_to_cpu(shdr
->CreditRequest
);
692 handle_mid(struct mid_q_entry
*mid
, struct TCP_Server_Info
*server
,
693 char *buf
, int malformed
)
695 if (server
->ops
->check_trans2
&&
696 server
->ops
->check_trans2(mid
, server
, buf
, malformed
))
698 mid
->credits_received
= smb2_get_credits_from_hdr(buf
, server
);
700 mid
->large_buf
= server
->large_buf
;
701 /* Was previous buf put in mpx struct for multi-rsp? */
702 if (!mid
->multiRsp
) {
703 /* smb buffer will be freed by user thread */
704 if (server
->large_buf
)
705 server
->bigbuf
= NULL
;
707 server
->smallbuf
= NULL
;
709 dequeue_mid(mid
, malformed
);
712 static void clean_demultiplex_info(struct TCP_Server_Info
*server
)
716 /* take it off the list, if it's not already */
717 spin_lock(&cifs_tcp_ses_lock
);
718 list_del_init(&server
->tcp_ses_list
);
719 spin_unlock(&cifs_tcp_ses_lock
);
721 cancel_delayed_work_sync(&server
->echo
);
722 cancel_delayed_work_sync(&server
->resolve
);
724 spin_lock(&GlobalMid_Lock
);
725 server
->tcpStatus
= CifsExiting
;
726 spin_unlock(&GlobalMid_Lock
);
727 wake_up_all(&server
->response_q
);
729 /* check if we have blocked requests that need to free */
730 spin_lock(&server
->req_lock
);
731 if (server
->credits
<= 0)
733 spin_unlock(&server
->req_lock
);
735 * Although there should not be any requests blocked on this queue it
736 * can not hurt to be paranoid and try to wake up requests that may
737 * haven been blocked when more than 50 at time were on the wire to the
738 * same server - they now will see the session is in exit state and get
739 * out of SendReceive.
741 wake_up_all(&server
->request_q
);
742 /* give those requests time to exit */
744 if (cifs_rdma_enabled(server
))
745 smbd_destroy(server
);
746 if (server
->ssocket
) {
747 sock_release(server
->ssocket
);
748 server
->ssocket
= NULL
;
751 if (!list_empty(&server
->pending_mid_q
)) {
752 struct list_head dispose_list
;
753 struct mid_q_entry
*mid_entry
;
754 struct list_head
*tmp
, *tmp2
;
756 INIT_LIST_HEAD(&dispose_list
);
757 spin_lock(&GlobalMid_Lock
);
758 list_for_each_safe(tmp
, tmp2
, &server
->pending_mid_q
) {
759 mid_entry
= list_entry(tmp
, struct mid_q_entry
, qhead
);
760 cifs_dbg(FYI
, "Clearing mid %llu\n", mid_entry
->mid
);
761 kref_get(&mid_entry
->refcount
);
762 mid_entry
->mid_state
= MID_SHUTDOWN
;
763 list_move(&mid_entry
->qhead
, &dispose_list
);
764 mid_entry
->mid_flags
|= MID_DELETED
;
766 spin_unlock(&GlobalMid_Lock
);
768 /* now walk dispose list and issue callbacks */
769 list_for_each_safe(tmp
, tmp2
, &dispose_list
) {
770 mid_entry
= list_entry(tmp
, struct mid_q_entry
, qhead
);
771 cifs_dbg(FYI
, "Callback mid %llu\n", mid_entry
->mid
);
772 list_del_init(&mid_entry
->qhead
);
773 mid_entry
->callback(mid_entry
);
774 cifs_mid_q_entry_release(mid_entry
);
776 /* 1/8th of sec is more than enough time for them to exit */
780 if (!list_empty(&server
->pending_mid_q
)) {
782 * mpx threads have not exited yet give them at least the smb
783 * send timeout time for long ops.
785 * Due to delays on oplock break requests, we need to wait at
786 * least 45 seconds before giving up on a request getting a
787 * response and going ahead and killing cifsd.
789 cifs_dbg(FYI
, "Wait for exit from demultiplex thread\n");
792 * If threads still have not exited they are probably never
793 * coming home not much else we can do but free the memory.
799 length
= atomic_dec_return(&tcpSesAllocCount
);
801 mempool_resize(cifs_req_poolp
, length
+ cifs_min_rcv
);
805 standard_receive3(struct TCP_Server_Info
*server
, struct mid_q_entry
*mid
)
808 char *buf
= server
->smallbuf
;
809 unsigned int pdu_length
= server
->pdu_size
;
811 /* make sure this will fit in a large buffer */
812 if (pdu_length
> CIFSMaxBufSize
+ MAX_HEADER_SIZE(server
) -
813 server
->vals
->header_preamble_size
) {
814 cifs_server_dbg(VFS
, "SMB response too long (%u bytes)\n", pdu_length
);
815 cifs_reconnect(server
);
816 return -ECONNABORTED
;
819 /* switch to large buffer if too big for a small one */
820 if (pdu_length
> MAX_CIFS_SMALL_BUFFER_SIZE
- 4) {
821 server
->large_buf
= true;
822 memcpy(server
->bigbuf
, buf
, server
->total_read
);
823 buf
= server
->bigbuf
;
826 /* now read the rest */
827 length
= cifs_read_from_socket(server
, buf
+ HEADER_SIZE(server
) - 1,
828 pdu_length
- HEADER_SIZE(server
) + 1
829 + server
->vals
->header_preamble_size
);
833 server
->total_read
+= length
;
835 dump_smb(buf
, server
->total_read
);
837 return cifs_handle_standard(server
, mid
);
841 cifs_handle_standard(struct TCP_Server_Info
*server
, struct mid_q_entry
*mid
)
843 char *buf
= server
->large_buf
? server
->bigbuf
: server
->smallbuf
;
847 * We know that we received enough to get to the MID as we
848 * checked the pdu_length earlier. Now check to see
849 * if the rest of the header is OK. We borrow the length
850 * var for the rest of the loop to avoid a new stack var.
852 * 48 bytes is enough to display the header and a little bit
853 * into the payload for debugging purposes.
855 length
= server
->ops
->check_message(buf
, server
->total_read
, server
);
857 cifs_dump_mem("Bad SMB: ", buf
,
858 min_t(unsigned int, server
->total_read
, 48));
860 if (server
->ops
->is_session_expired
&&
861 server
->ops
->is_session_expired(buf
)) {
862 cifs_reconnect(server
);
866 if (server
->ops
->is_status_pending
&&
867 server
->ops
->is_status_pending(buf
, server
))
873 handle_mid(mid
, server
, buf
, length
);
878 smb2_add_credits_from_hdr(char *buffer
, struct TCP_Server_Info
*server
)
880 struct smb2_sync_hdr
*shdr
= (struct smb2_sync_hdr
*)buffer
;
881 int scredits
, in_flight
;
884 * SMB1 does not use credits.
886 if (server
->vals
->header_preamble_size
)
889 if (shdr
->CreditRequest
) {
890 spin_lock(&server
->req_lock
);
891 server
->credits
+= le16_to_cpu(shdr
->CreditRequest
);
892 scredits
= server
->credits
;
893 in_flight
= server
->in_flight
;
894 spin_unlock(&server
->req_lock
);
895 wake_up(&server
->request_q
);
897 trace_smb3_add_credits(server
->CurrentMid
,
898 server
->conn_id
, server
->hostname
, scredits
,
899 le16_to_cpu(shdr
->CreditRequest
), in_flight
);
900 cifs_server_dbg(FYI
, "%s: added %u credits total=%d\n",
901 __func__
, le16_to_cpu(shdr
->CreditRequest
),
908 cifs_demultiplex_thread(void *p
)
910 int i
, num_mids
, length
;
911 struct TCP_Server_Info
*server
= p
;
912 unsigned int pdu_length
;
913 unsigned int next_offset
;
915 struct task_struct
*task_to_wake
= NULL
;
916 struct mid_q_entry
*mids
[MAX_COMPOUND
];
917 char *bufs
[MAX_COMPOUND
];
918 unsigned int noreclaim_flag
, num_io_timeout
= 0;
920 noreclaim_flag
= memalloc_noreclaim_save();
921 cifs_dbg(FYI
, "Demultiplex PID: %d\n", task_pid_nr(current
));
923 length
= atomic_inc_return(&tcpSesAllocCount
);
925 mempool_resize(cifs_req_poolp
, length
+ cifs_min_rcv
);
928 allow_kernel_signal(SIGKILL
);
929 while (server
->tcpStatus
!= CifsExiting
) {
933 if (!allocate_buffers(server
))
936 server
->large_buf
= false;
937 buf
= server
->smallbuf
;
938 pdu_length
= 4; /* enough to get RFC1001 header */
940 length
= cifs_read_from_socket(server
, buf
, pdu_length
);
944 if (server
->vals
->header_preamble_size
== 0)
945 server
->total_read
= 0;
947 server
->total_read
= length
;
950 * The right amount was read from socket - 4 bytes,
951 * so we can now interpret the length field.
953 pdu_length
= get_rfc1002_length(buf
);
955 cifs_dbg(FYI
, "RFC1002 header 0x%x\n", pdu_length
);
956 if (!is_smb_response(server
, buf
[0]))
959 server
->pdu_size
= pdu_length
;
961 /* make sure we have enough to get to the MID */
962 if (server
->pdu_size
< HEADER_SIZE(server
) - 1 -
963 server
->vals
->header_preamble_size
) {
964 cifs_server_dbg(VFS
, "SMB response too short (%u bytes)\n",
966 cifs_reconnect(server
);
970 /* read down to the MID */
971 length
= cifs_read_from_socket(server
,
972 buf
+ server
->vals
->header_preamble_size
,
973 HEADER_SIZE(server
) - 1
974 - server
->vals
->header_preamble_size
);
977 server
->total_read
+= length
;
979 if (server
->ops
->next_header
) {
980 next_offset
= server
->ops
->next_header(buf
);
982 server
->pdu_size
= next_offset
;
985 memset(mids
, 0, sizeof(mids
));
986 memset(bufs
, 0, sizeof(bufs
));
989 if (server
->ops
->is_transform_hdr
&&
990 server
->ops
->receive_transform
&&
991 server
->ops
->is_transform_hdr(buf
)) {
992 length
= server
->ops
->receive_transform(server
,
997 mids
[0] = server
->ops
->find_mid(server
, buf
);
1001 if (!mids
[0] || !mids
[0]->receive
)
1002 length
= standard_receive3(server
, mids
[0]);
1004 length
= mids
[0]->receive(server
, mids
[0]);
1008 for (i
= 0; i
< num_mids
; i
++)
1010 cifs_mid_q_entry_release(mids
[i
]);
1014 if (server
->ops
->is_status_io_timeout
&&
1015 server
->ops
->is_status_io_timeout(buf
)) {
1017 if (num_io_timeout
> NUM_STATUS_IO_TIMEOUT
) {
1018 cifs_reconnect(server
);
1024 server
->lstrp
= jiffies
;
1026 for (i
= 0; i
< num_mids
; i
++) {
1027 if (mids
[i
] != NULL
) {
1028 mids
[i
]->resp_buf_size
= server
->pdu_size
;
1030 if (bufs
[i
] && server
->ops
->is_network_name_deleted
)
1031 server
->ops
->is_network_name_deleted(bufs
[i
],
1034 if (!mids
[i
]->multiRsp
|| mids
[i
]->multiEnd
)
1035 mids
[i
]->callback(mids
[i
]);
1037 cifs_mid_q_entry_release(mids
[i
]);
1038 } else if (server
->ops
->is_oplock_break
&&
1039 server
->ops
->is_oplock_break(bufs
[i
],
1041 smb2_add_credits_from_hdr(bufs
[i
], server
);
1042 cifs_dbg(FYI
, "Received oplock break\n");
1044 cifs_server_dbg(VFS
, "No task to wake, unknown frame received! NumMids %d\n",
1045 atomic_read(&midCount
));
1046 cifs_dump_mem("Received Data is: ", bufs
[i
],
1047 HEADER_SIZE(server
));
1048 smb2_add_credits_from_hdr(bufs
[i
], server
);
1049 #ifdef CONFIG_CIFS_DEBUG2
1050 if (server
->ops
->dump_detail
)
1051 server
->ops
->dump_detail(bufs
[i
],
1053 cifs_dump_mids(server
);
1054 #endif /* CIFS_DEBUG2 */
1058 if (pdu_length
> server
->pdu_size
) {
1059 if (!allocate_buffers(server
))
1061 pdu_length
-= server
->pdu_size
;
1062 server
->total_read
= 0;
1063 server
->large_buf
= false;
1064 buf
= server
->smallbuf
;
1067 } /* end while !EXITING */
1069 /* buffer usually freed in free_mid - need to free it here on exit */
1070 cifs_buf_release(server
->bigbuf
);
1071 if (server
->smallbuf
) /* no sense logging a debug message if NULL */
1072 cifs_small_buf_release(server
->smallbuf
);
1074 task_to_wake
= xchg(&server
->tsk
, NULL
);
1075 clean_demultiplex_info(server
);
1077 /* if server->tsk was NULL then wait for a signal before exiting */
1078 if (!task_to_wake
) {
1079 set_current_state(TASK_INTERRUPTIBLE
);
1080 while (!signal_pending(current
)) {
1082 set_current_state(TASK_INTERRUPTIBLE
);
1084 set_current_state(TASK_RUNNING
);
1087 memalloc_noreclaim_restore(noreclaim_flag
);
1088 module_put_and_exit(0);
1092 * Returns true if srcaddr isn't specified and rhs isn't specified, or
1093 * if srcaddr is specified and matches the IP address of the rhs argument
1096 cifs_match_ipaddr(struct sockaddr
*srcaddr
, struct sockaddr
*rhs
)
1098 switch (srcaddr
->sa_family
) {
1100 return (rhs
->sa_family
== AF_UNSPEC
);
1102 struct sockaddr_in
*saddr4
= (struct sockaddr_in
*)srcaddr
;
1103 struct sockaddr_in
*vaddr4
= (struct sockaddr_in
*)rhs
;
1104 return (saddr4
->sin_addr
.s_addr
== vaddr4
->sin_addr
.s_addr
);
1107 struct sockaddr_in6
*saddr6
= (struct sockaddr_in6
*)srcaddr
;
1108 struct sockaddr_in6
*vaddr6
= (struct sockaddr_in6
*)rhs
;
1109 return ipv6_addr_equal(&saddr6
->sin6_addr
, &vaddr6
->sin6_addr
);
1113 return false; /* don't expect to be here */
1118 * If no port is specified in addr structure, we try to match with 445 port
1119 * and if it fails - with 139 ports. It should be called only if address
1120 * families of server and addr are equal.
1123 match_port(struct TCP_Server_Info
*server
, struct sockaddr
*addr
)
1125 __be16 port
, *sport
;
1127 /* SMBDirect manages its own ports, don't match it here */
1131 switch (addr
->sa_family
) {
1133 sport
= &((struct sockaddr_in
*) &server
->dstaddr
)->sin_port
;
1134 port
= ((struct sockaddr_in
*) addr
)->sin_port
;
1137 sport
= &((struct sockaddr_in6
*) &server
->dstaddr
)->sin6_port
;
1138 port
= ((struct sockaddr_in6
*) addr
)->sin6_port
;
1146 port
= htons(CIFS_PORT
);
1150 port
= htons(RFC1001_PORT
);
1153 return port
== *sport
;
1157 match_address(struct TCP_Server_Info
*server
, struct sockaddr
*addr
,
1158 struct sockaddr
*srcaddr
)
1160 switch (addr
->sa_family
) {
1162 struct sockaddr_in
*addr4
= (struct sockaddr_in
*)addr
;
1163 struct sockaddr_in
*srv_addr4
=
1164 (struct sockaddr_in
*)&server
->dstaddr
;
1166 if (addr4
->sin_addr
.s_addr
!= srv_addr4
->sin_addr
.s_addr
)
1171 struct sockaddr_in6
*addr6
= (struct sockaddr_in6
*)addr
;
1172 struct sockaddr_in6
*srv_addr6
=
1173 (struct sockaddr_in6
*)&server
->dstaddr
;
1175 if (!ipv6_addr_equal(&addr6
->sin6_addr
,
1176 &srv_addr6
->sin6_addr
))
1178 if (addr6
->sin6_scope_id
!= srv_addr6
->sin6_scope_id
)
1184 return false; /* don't expect to be here */
1187 if (!cifs_match_ipaddr(srcaddr
, (struct sockaddr
*)&server
->srcaddr
))
1194 match_security(struct TCP_Server_Info
*server
, struct smb3_fs_context
*ctx
)
1197 * The select_sectype function should either return the ctx->sectype
1198 * that was specified, or "Unspecified" if that sectype was not
1199 * compatible with the given NEGOTIATE request.
1201 if (server
->ops
->select_sectype(server
, ctx
->sectype
)
1206 * Now check if signing mode is acceptable. No need to check
1207 * global_secflags at this point since if MUST_SIGN is set then
1208 * the server->sign had better be too.
1210 if (ctx
->sign
&& !server
->sign
)
1216 static int match_server(struct TCP_Server_Info
*server
, struct smb3_fs_context
*ctx
)
1218 struct sockaddr
*addr
= (struct sockaddr
*)&ctx
->dstaddr
;
1220 if (ctx
->nosharesock
)
1223 /* this server does not share socket */
1224 if (server
->nosharesock
)
1227 /* If multidialect negotiation see if existing sessions match one */
1228 if (strcmp(ctx
->vals
->version_string
, SMB3ANY_VERSION_STRING
) == 0) {
1229 if (server
->vals
->protocol_id
< SMB30_PROT_ID
)
1231 } else if (strcmp(ctx
->vals
->version_string
,
1232 SMBDEFAULT_VERSION_STRING
) == 0) {
1233 if (server
->vals
->protocol_id
< SMB21_PROT_ID
)
1235 } else if ((server
->vals
!= ctx
->vals
) || (server
->ops
!= ctx
->ops
))
1238 if (!net_eq(cifs_net_ns(server
), current
->nsproxy
->net_ns
))
1241 if (strcasecmp(server
->hostname
, ctx
->server_hostname
))
1244 if (!match_address(server
, addr
,
1245 (struct sockaddr
*)&ctx
->srcaddr
))
1248 if (!match_port(server
, addr
))
1251 if (!match_security(server
, ctx
))
1254 if (server
->echo_interval
!= ctx
->echo_interval
* HZ
)
1257 if (server
->rdma
!= ctx
->rdma
)
1260 if (server
->ignore_signature
!= ctx
->ignore_signature
)
1263 if (server
->min_offload
!= ctx
->min_offload
)
1269 struct TCP_Server_Info
*
1270 cifs_find_tcp_session(struct smb3_fs_context
*ctx
)
1272 struct TCP_Server_Info
*server
;
1274 spin_lock(&cifs_tcp_ses_lock
);
1275 list_for_each_entry(server
, &cifs_tcp_ses_list
, tcp_ses_list
) {
1276 #ifdef CONFIG_CIFS_DFS_UPCALL
1278 * DFS failover implementation in cifs_reconnect() requires unique tcp sessions for
1279 * DFS connections to do failover properly, so avoid sharing them with regular
1280 * shares or even links that may connect to same server but having completely
1281 * different failover targets.
1283 if (server
->is_dfs_conn
)
1287 * Skip ses channels since they're only handled in lower layers
1288 * (e.g. cifs_send_recv).
1290 if (server
->is_channel
|| !match_server(server
, ctx
))
1293 ++server
->srv_count
;
1294 spin_unlock(&cifs_tcp_ses_lock
);
1295 cifs_dbg(FYI
, "Existing tcp session with server found\n");
1298 spin_unlock(&cifs_tcp_ses_lock
);
1303 cifs_put_tcp_session(struct TCP_Server_Info
*server
, int from_reconnect
)
1305 struct task_struct
*task
;
1307 spin_lock(&cifs_tcp_ses_lock
);
1308 if (--server
->srv_count
> 0) {
1309 spin_unlock(&cifs_tcp_ses_lock
);
1313 /* srv_count can never go negative */
1314 WARN_ON(server
->srv_count
< 0);
1316 put_net(cifs_net_ns(server
));
1318 list_del_init(&server
->tcp_ses_list
);
1319 spin_unlock(&cifs_tcp_ses_lock
);
1321 cancel_delayed_work_sync(&server
->echo
);
1322 cancel_delayed_work_sync(&server
->resolve
);
1326 * Avoid deadlock here: reconnect work calls
1327 * cifs_put_tcp_session() at its end. Need to be sure
1328 * that reconnect work does nothing with server pointer after
1331 cancel_delayed_work(&server
->reconnect
);
1333 cancel_delayed_work_sync(&server
->reconnect
);
1335 spin_lock(&GlobalMid_Lock
);
1336 server
->tcpStatus
= CifsExiting
;
1337 spin_unlock(&GlobalMid_Lock
);
1339 cifs_crypto_secmech_release(server
);
1340 cifs_fscache_release_client_cookie(server
);
1342 kfree(server
->session_key
.response
);
1343 server
->session_key
.response
= NULL
;
1344 server
->session_key
.len
= 0;
1345 kfree(server
->hostname
);
1347 task
= xchg(&server
->tsk
, NULL
);
1349 send_sig(SIGKILL
, task
, 1);
1352 struct TCP_Server_Info
*
1353 cifs_get_tcp_session(struct smb3_fs_context
*ctx
)
1355 struct TCP_Server_Info
*tcp_ses
= NULL
;
1358 cifs_dbg(FYI
, "UNC: %s\n", ctx
->UNC
);
1360 /* see if we already have a matching tcp_ses */
1361 tcp_ses
= cifs_find_tcp_session(ctx
);
1365 tcp_ses
= kzalloc(sizeof(struct TCP_Server_Info
), GFP_KERNEL
);
1371 tcp_ses
->hostname
= kstrdup(ctx
->server_hostname
, GFP_KERNEL
);
1372 if (!tcp_ses
->hostname
) {
1377 if (ctx
->nosharesock
)
1378 tcp_ses
->nosharesock
= true;
1380 tcp_ses
->ops
= ctx
->ops
;
1381 tcp_ses
->vals
= ctx
->vals
;
1382 cifs_set_net_ns(tcp_ses
, get_net(current
->nsproxy
->net_ns
));
1384 tcp_ses
->conn_id
= atomic_inc_return(&tcpSesNextId
);
1385 tcp_ses
->noblockcnt
= ctx
->rootfs
;
1386 tcp_ses
->noblocksnd
= ctx
->noblocksnd
|| ctx
->rootfs
;
1387 tcp_ses
->noautotune
= ctx
->noautotune
;
1388 tcp_ses
->tcp_nodelay
= ctx
->sockopt_tcp_nodelay
;
1389 tcp_ses
->rdma
= ctx
->rdma
;
1390 tcp_ses
->in_flight
= 0;
1391 tcp_ses
->max_in_flight
= 0;
1392 tcp_ses
->credits
= 1;
1393 init_waitqueue_head(&tcp_ses
->response_q
);
1394 init_waitqueue_head(&tcp_ses
->request_q
);
1395 INIT_LIST_HEAD(&tcp_ses
->pending_mid_q
);
1396 mutex_init(&tcp_ses
->srv_mutex
);
1397 memcpy(tcp_ses
->workstation_RFC1001_name
,
1398 ctx
->source_rfc1001_name
, RFC1001_NAME_LEN_WITH_NULL
);
1399 memcpy(tcp_ses
->server_RFC1001_name
,
1400 ctx
->target_rfc1001_name
, RFC1001_NAME_LEN_WITH_NULL
);
1401 tcp_ses
->session_estab
= false;
1402 tcp_ses
->sequence_number
= 0;
1403 tcp_ses
->reconnect_instance
= 1;
1404 tcp_ses
->lstrp
= jiffies
;
1405 tcp_ses
->compress_algorithm
= cpu_to_le16(ctx
->compression
);
1406 spin_lock_init(&tcp_ses
->req_lock
);
1407 INIT_LIST_HEAD(&tcp_ses
->tcp_ses_list
);
1408 INIT_LIST_HEAD(&tcp_ses
->smb_ses_list
);
1409 INIT_DELAYED_WORK(&tcp_ses
->echo
, cifs_echo_request
);
1410 INIT_DELAYED_WORK(&tcp_ses
->resolve
, cifs_resolve_server
);
1411 INIT_DELAYED_WORK(&tcp_ses
->reconnect
, smb2_reconnect_server
);
1412 mutex_init(&tcp_ses
->reconnect_mutex
);
1413 memcpy(&tcp_ses
->srcaddr
, &ctx
->srcaddr
,
1414 sizeof(tcp_ses
->srcaddr
));
1415 memcpy(&tcp_ses
->dstaddr
, &ctx
->dstaddr
,
1416 sizeof(tcp_ses
->dstaddr
));
1417 if (ctx
->use_client_guid
)
1418 memcpy(tcp_ses
->client_guid
, ctx
->client_guid
,
1419 SMB2_CLIENT_GUID_SIZE
);
1421 generate_random_uuid(tcp_ses
->client_guid
);
1423 * at this point we are the only ones with the pointer
1424 * to the struct since the kernel thread not created yet
1425 * no need to spinlock this init of tcpStatus or srv_count
1427 tcp_ses
->tcpStatus
= CifsNew
;
1428 ++tcp_ses
->srv_count
;
1430 if (ctx
->echo_interval
>= SMB_ECHO_INTERVAL_MIN
&&
1431 ctx
->echo_interval
<= SMB_ECHO_INTERVAL_MAX
)
1432 tcp_ses
->echo_interval
= ctx
->echo_interval
* HZ
;
1434 tcp_ses
->echo_interval
= SMB_ECHO_INTERVAL_DEFAULT
* HZ
;
1435 if (tcp_ses
->rdma
) {
1436 #ifndef CONFIG_CIFS_SMB_DIRECT
1437 cifs_dbg(VFS
, "CONFIG_CIFS_SMB_DIRECT is not enabled\n");
1439 goto out_err_crypto_release
;
1441 tcp_ses
->smbd_conn
= smbd_get_connection(
1442 tcp_ses
, (struct sockaddr
*)&ctx
->dstaddr
);
1443 if (tcp_ses
->smbd_conn
) {
1444 cifs_dbg(VFS
, "RDMA transport established\n");
1446 goto smbd_connected
;
1449 goto out_err_crypto_release
;
1452 rc
= ip_connect(tcp_ses
);
1454 cifs_dbg(VFS
, "Error connecting to socket. Aborting operation.\n");
1455 goto out_err_crypto_release
;
1459 * since we're in a cifs function already, we know that
1460 * this will succeed. No need for try_module_get().
1462 __module_get(THIS_MODULE
);
1463 tcp_ses
->tsk
= kthread_run(cifs_demultiplex_thread
,
1465 if (IS_ERR(tcp_ses
->tsk
)) {
1466 rc
= PTR_ERR(tcp_ses
->tsk
);
1467 cifs_dbg(VFS
, "error %d create cifsd thread\n", rc
);
1468 module_put(THIS_MODULE
);
1469 goto out_err_crypto_release
;
1471 tcp_ses
->min_offload
= ctx
->min_offload
;
1473 * at this point we are the only ones with the pointer
1474 * to the struct since the kernel thread not created yet
1475 * no need to spinlock this update of tcpStatus
1477 tcp_ses
->tcpStatus
= CifsNeedNegotiate
;
1479 if ((ctx
->max_credits
< 20) || (ctx
->max_credits
> 60000))
1480 tcp_ses
->max_credits
= SMB2_MAX_CREDITS_AVAILABLE
;
1482 tcp_ses
->max_credits
= ctx
->max_credits
;
1484 tcp_ses
->nr_targets
= 1;
1485 tcp_ses
->ignore_signature
= ctx
->ignore_signature
;
1486 /* thread spawned, put it on the list */
1487 spin_lock(&cifs_tcp_ses_lock
);
1488 list_add(&tcp_ses
->tcp_ses_list
, &cifs_tcp_ses_list
);
1489 spin_unlock(&cifs_tcp_ses_lock
);
1491 cifs_fscache_get_client_cookie(tcp_ses
);
1493 /* queue echo request delayed work */
1494 queue_delayed_work(cifsiod_wq
, &tcp_ses
->echo
, tcp_ses
->echo_interval
);
1496 /* queue dns resolution delayed work */
1497 cifs_dbg(FYI
, "%s: next dns resolution scheduled for %d seconds in the future\n",
1498 __func__
, SMB_DNS_RESOLVE_INTERVAL_DEFAULT
);
1500 queue_delayed_work(cifsiod_wq
, &tcp_ses
->resolve
, (SMB_DNS_RESOLVE_INTERVAL_DEFAULT
* HZ
));
1504 out_err_crypto_release
:
1505 cifs_crypto_secmech_release(tcp_ses
);
1507 put_net(cifs_net_ns(tcp_ses
));
1511 kfree(tcp_ses
->hostname
);
1512 if (tcp_ses
->ssocket
)
1513 sock_release(tcp_ses
->ssocket
);
1519 static int match_session(struct cifs_ses
*ses
, struct smb3_fs_context
*ctx
)
1521 if (ctx
->sectype
!= Unspecified
&&
1522 ctx
->sectype
!= ses
->sectype
)
1526 * If an existing session is limited to less channels than
1527 * requested, it should not be reused
1529 if (ses
->chan_max
< ctx
->max_channels
)
1532 switch (ses
->sectype
) {
1534 if (!uid_eq(ctx
->cred_uid
, ses
->cred_uid
))
1538 /* NULL username means anonymous session */
1539 if (ses
->user_name
== NULL
) {
1545 /* anything else takes username/password */
1546 if (strncmp(ses
->user_name
,
1547 ctx
->username
? ctx
->username
: "",
1548 CIFS_MAX_USERNAME_LEN
))
1550 if ((ctx
->username
&& strlen(ctx
->username
) != 0) &&
1551 ses
->password
!= NULL
&&
1552 strncmp(ses
->password
,
1553 ctx
->password
? ctx
->password
: "",
1554 CIFS_MAX_PASSWORD_LEN
))
1561 * cifs_setup_ipc - helper to setup the IPC tcon for the session
1562 * @ses: smb session to issue the request on
1563 * @ctx: the superblock configuration context to use for building the
1564 * new tree connection for the IPC (interprocess communication RPC)
1566 * A new IPC connection is made and stored in the session
1567 * tcon_ipc. The IPC tcon has the same lifetime as the session.
1570 cifs_setup_ipc(struct cifs_ses
*ses
, struct smb3_fs_context
*ctx
)
1573 struct cifs_tcon
*tcon
;
1574 char unc
[SERVER_NAME_LENGTH
+ sizeof("//x/IPC$")] = {0};
1576 struct TCP_Server_Info
*server
= ses
->server
;
1579 * If the mount request that resulted in the creation of the
1580 * session requires encryption, force IPC to be encrypted too.
1583 if (server
->capabilities
& SMB2_GLOBAL_CAP_ENCRYPTION
)
1586 cifs_server_dbg(VFS
,
1587 "IPC: server doesn't support encryption\n");
1592 tcon
= tconInfoAlloc();
1596 scnprintf(unc
, sizeof(unc
), "\\\\%s\\IPC$", server
->hostname
);
1602 rc
= server
->ops
->tree_connect(xid
, ses
, unc
, tcon
, ctx
->local_nls
);
1606 cifs_server_dbg(VFS
, "failed to connect to IPC (rc=%d)\n", rc
);
1611 cifs_dbg(FYI
, "IPC tcon rc = %d ipc tid = %d\n", rc
, tcon
->tid
);
1613 ses
->tcon_ipc
= tcon
;
1619 * cifs_free_ipc - helper to release the session IPC tcon
1620 * @ses: smb session to unmount the IPC from
1622 * Needs to be called everytime a session is destroyed.
1624 * On session close, the IPC is closed and the server must release all tcons of the session.
1625 * No need to send a tree disconnect here.
1627 * Besides, it will make the server to not close durable and resilient files on session close, as
1628 * specified in MS-SMB2 3.3.5.6 Receiving an SMB2 LOGOFF Request.
1631 cifs_free_ipc(struct cifs_ses
*ses
)
1633 struct cifs_tcon
*tcon
= ses
->tcon_ipc
;
1639 ses
->tcon_ipc
= NULL
;
1643 static struct cifs_ses
*
1644 cifs_find_smb_ses(struct TCP_Server_Info
*server
, struct smb3_fs_context
*ctx
)
1646 struct cifs_ses
*ses
;
1648 spin_lock(&cifs_tcp_ses_lock
);
1649 list_for_each_entry(ses
, &server
->smb_ses_list
, smb_ses_list
) {
1650 if (ses
->status
== CifsExiting
)
1652 if (!match_session(ses
, ctx
))
1655 spin_unlock(&cifs_tcp_ses_lock
);
1658 spin_unlock(&cifs_tcp_ses_lock
);
1662 void cifs_put_smb_ses(struct cifs_ses
*ses
)
1664 unsigned int rc
, xid
;
1665 struct TCP_Server_Info
*server
= ses
->server
;
1666 cifs_dbg(FYI
, "%s: ses_count=%d\n", __func__
, ses
->ses_count
);
1668 spin_lock(&cifs_tcp_ses_lock
);
1669 if (ses
->status
== CifsExiting
) {
1670 spin_unlock(&cifs_tcp_ses_lock
);
1674 cifs_dbg(FYI
, "%s: ses_count=%d\n", __func__
, ses
->ses_count
);
1675 cifs_dbg(FYI
, "%s: ses ipc: %s\n", __func__
, ses
->tcon_ipc
? ses
->tcon_ipc
->treeName
: "NONE");
1677 if (--ses
->ses_count
> 0) {
1678 spin_unlock(&cifs_tcp_ses_lock
);
1681 spin_unlock(&cifs_tcp_ses_lock
);
1683 /* ses_count can never go negative */
1684 WARN_ON(ses
->ses_count
< 0);
1686 spin_lock(&GlobalMid_Lock
);
1687 if (ses
->status
== CifsGood
)
1688 ses
->status
= CifsExiting
;
1689 spin_unlock(&GlobalMid_Lock
);
1693 if (ses
->status
== CifsExiting
&& server
->ops
->logoff
) {
1695 rc
= server
->ops
->logoff(xid
, ses
);
1697 cifs_server_dbg(VFS
, "%s: Session Logoff failure rc=%d\n",
1702 spin_lock(&cifs_tcp_ses_lock
);
1703 list_del_init(&ses
->smb_ses_list
);
1704 spin_unlock(&cifs_tcp_ses_lock
);
1706 /* close any extra channels */
1707 if (ses
->chan_count
> 1) {
1710 for (i
= 1; i
< ses
->chan_count
; i
++)
1711 cifs_put_tcp_session(ses
->chans
[i
].server
, 0);
1715 cifs_put_tcp_session(server
, 0);
1720 /* strlen("cifs:a:") + CIFS_MAX_DOMAINNAME_LEN + 1 */
1721 #define CIFSCREDS_DESC_SIZE (7 + CIFS_MAX_DOMAINNAME_LEN + 1)
1723 /* Populate username and pw fields from keyring if possible */
1725 cifs_set_cifscreds(struct smb3_fs_context
*ctx
, struct cifs_ses
*ses
)
1729 const char *delim
, *payload
;
1733 struct TCP_Server_Info
*server
= ses
->server
;
1734 struct sockaddr_in
*sa
;
1735 struct sockaddr_in6
*sa6
;
1736 const struct user_key_payload
*upayload
;
1738 desc
= kmalloc(CIFSCREDS_DESC_SIZE
, GFP_KERNEL
);
1742 /* try to find an address key first */
1743 switch (server
->dstaddr
.ss_family
) {
1745 sa
= (struct sockaddr_in
*)&server
->dstaddr
;
1746 sprintf(desc
, "cifs:a:%pI4", &sa
->sin_addr
.s_addr
);
1749 sa6
= (struct sockaddr_in6
*)&server
->dstaddr
;
1750 sprintf(desc
, "cifs:a:%pI6c", &sa6
->sin6_addr
.s6_addr
);
1753 cifs_dbg(FYI
, "Bad ss_family (%hu)\n",
1754 server
->dstaddr
.ss_family
);
1759 cifs_dbg(FYI
, "%s: desc=%s\n", __func__
, desc
);
1760 key
= request_key(&key_type_logon
, desc
, "");
1762 if (!ses
->domainName
) {
1763 cifs_dbg(FYI
, "domainName is NULL\n");
1768 /* didn't work, try to find a domain key */
1769 sprintf(desc
, "cifs:d:%s", ses
->domainName
);
1770 cifs_dbg(FYI
, "%s: desc=%s\n", __func__
, desc
);
1771 key
= request_key(&key_type_logon
, desc
, "");
1779 down_read(&key
->sem
);
1780 upayload
= user_key_payload_locked(key
);
1781 if (IS_ERR_OR_NULL(upayload
)) {
1782 rc
= upayload
? PTR_ERR(upayload
) : -EINVAL
;
1786 /* find first : in payload */
1787 payload
= upayload
->data
;
1788 delim
= strnchr(payload
, upayload
->datalen
, ':');
1789 cifs_dbg(FYI
, "payload=%s\n", payload
);
1791 cifs_dbg(FYI
, "Unable to find ':' in payload (datalen=%d)\n",
1797 len
= delim
- payload
;
1798 if (len
> CIFS_MAX_USERNAME_LEN
|| len
<= 0) {
1799 cifs_dbg(FYI
, "Bad value from username search (len=%zd)\n",
1805 ctx
->username
= kstrndup(payload
, len
, GFP_KERNEL
);
1806 if (!ctx
->username
) {
1807 cifs_dbg(FYI
, "Unable to allocate %zd bytes for username\n",
1812 cifs_dbg(FYI
, "%s: username=%s\n", __func__
, ctx
->username
);
1814 len
= key
->datalen
- (len
+ 1);
1815 if (len
> CIFS_MAX_PASSWORD_LEN
|| len
<= 0) {
1816 cifs_dbg(FYI
, "Bad len for password search (len=%zd)\n", len
);
1818 kfree(ctx
->username
);
1819 ctx
->username
= NULL
;
1824 ctx
->password
= kstrndup(delim
, len
, GFP_KERNEL
);
1825 if (!ctx
->password
) {
1826 cifs_dbg(FYI
, "Unable to allocate %zd bytes for password\n",
1829 kfree(ctx
->username
);
1830 ctx
->username
= NULL
;
1835 * If we have a domain key then we must set the domainName in the
1838 if (is_domain
&& ses
->domainName
) {
1839 ctx
->domainname
= kstrdup(ses
->domainName
, GFP_KERNEL
);
1840 if (!ctx
->domainname
) {
1841 cifs_dbg(FYI
, "Unable to allocate %zd bytes for domain\n",
1844 kfree(ctx
->username
);
1845 ctx
->username
= NULL
;
1846 kfree_sensitive(ctx
->password
);
1847 ctx
->password
= NULL
;
1857 cifs_dbg(FYI
, "%s: returning %d\n", __func__
, rc
);
1860 #else /* ! CONFIG_KEYS */
1862 cifs_set_cifscreds(struct smb3_fs_context
*ctx
__attribute__((unused
)),
1863 struct cifs_ses
*ses
__attribute__((unused
)))
1867 #endif /* CONFIG_KEYS */
1870 * cifs_get_smb_ses - get a session matching @ctx data from @server
1871 * @server: server to setup the session to
1872 * @ctx: superblock configuration context to use to setup the session
1874 * This function assumes it is being called from cifs_mount() where we
1875 * already got a server reference (server refcount +1). See
1876 * cifs_get_tcon() for refcount explanations.
1879 cifs_get_smb_ses(struct TCP_Server_Info
*server
, struct smb3_fs_context
*ctx
)
1883 struct cifs_ses
*ses
;
1884 struct sockaddr_in
*addr
= (struct sockaddr_in
*)&server
->dstaddr
;
1885 struct sockaddr_in6
*addr6
= (struct sockaddr_in6
*)&server
->dstaddr
;
1889 ses
= cifs_find_smb_ses(server
, ctx
);
1891 cifs_dbg(FYI
, "Existing smb sess found (status=%d)\n",
1894 mutex_lock(&ses
->session_mutex
);
1895 rc
= cifs_negotiate_protocol(xid
, ses
);
1897 mutex_unlock(&ses
->session_mutex
);
1898 /* problem -- put our ses reference */
1899 cifs_put_smb_ses(ses
);
1903 if (ses
->need_reconnect
) {
1904 cifs_dbg(FYI
, "Session needs reconnect\n");
1905 rc
= cifs_setup_session(xid
, ses
,
1908 mutex_unlock(&ses
->session_mutex
);
1909 /* problem -- put our reference */
1910 cifs_put_smb_ses(ses
);
1915 mutex_unlock(&ses
->session_mutex
);
1917 /* existing SMB ses has a server reference already */
1918 cifs_put_tcp_session(server
, 0);
1923 cifs_dbg(FYI
, "Existing smb sess not found\n");
1924 ses
= sesInfoAlloc();
1928 /* new SMB session uses our server ref */
1929 ses
->server
= server
;
1930 if (server
->dstaddr
.ss_family
== AF_INET6
)
1931 sprintf(ses
->ip_addr
, "%pI6", &addr6
->sin6_addr
);
1933 sprintf(ses
->ip_addr
, "%pI4", &addr
->sin_addr
);
1935 if (ctx
->username
) {
1936 ses
->user_name
= kstrdup(ctx
->username
, GFP_KERNEL
);
1937 if (!ses
->user_name
)
1941 /* ctx->password freed at unmount */
1942 if (ctx
->password
) {
1943 ses
->password
= kstrdup(ctx
->password
, GFP_KERNEL
);
1947 if (ctx
->domainname
) {
1948 ses
->domainName
= kstrdup(ctx
->domainname
, GFP_KERNEL
);
1949 if (!ses
->domainName
)
1952 if (ctx
->domainauto
)
1953 ses
->domainAuto
= ctx
->domainauto
;
1954 ses
->cred_uid
= ctx
->cred_uid
;
1955 ses
->linux_uid
= ctx
->linux_uid
;
1957 ses
->sectype
= ctx
->sectype
;
1958 ses
->sign
= ctx
->sign
;
1959 mutex_lock(&ses
->session_mutex
);
1961 /* add server as first channel */
1962 ses
->chans
[0].server
= server
;
1963 ses
->chan_count
= 1;
1964 ses
->chan_max
= ctx
->multichannel
? ctx
->max_channels
:1;
1966 rc
= cifs_negotiate_protocol(xid
, ses
);
1968 rc
= cifs_setup_session(xid
, ses
, ctx
->local_nls
);
1970 /* each channel uses a different signing key */
1971 memcpy(ses
->chans
[0].signkey
, ses
->smb3signingkey
,
1972 sizeof(ses
->smb3signingkey
));
1974 mutex_unlock(&ses
->session_mutex
);
1978 /* success, put it on the list and add it as first channel */
1979 spin_lock(&cifs_tcp_ses_lock
);
1980 list_add(&ses
->smb_ses_list
, &server
->smb_ses_list
);
1981 spin_unlock(&cifs_tcp_ses_lock
);
1985 cifs_setup_ipc(ses
, ctx
);
1995 static int match_tcon(struct cifs_tcon
*tcon
, struct smb3_fs_context
*ctx
)
1997 if (tcon
->tidStatus
== CifsExiting
)
1999 if (strncmp(tcon
->treeName
, ctx
->UNC
, MAX_TREE_SIZE
))
2001 if (tcon
->seal
!= ctx
->seal
)
2003 if (tcon
->snapshot_time
!= ctx
->snapshot_time
)
2005 if (tcon
->handle_timeout
!= ctx
->handle_timeout
)
2007 if (tcon
->no_lease
!= ctx
->no_lease
)
2009 if (tcon
->nodelete
!= ctx
->nodelete
)
2014 static struct cifs_tcon
*
2015 cifs_find_tcon(struct cifs_ses
*ses
, struct smb3_fs_context
*ctx
)
2017 struct list_head
*tmp
;
2018 struct cifs_tcon
*tcon
;
2020 spin_lock(&cifs_tcp_ses_lock
);
2021 list_for_each(tmp
, &ses
->tcon_list
) {
2022 tcon
= list_entry(tmp
, struct cifs_tcon
, tcon_list
);
2024 if (!match_tcon(tcon
, ctx
))
2027 spin_unlock(&cifs_tcp_ses_lock
);
2030 spin_unlock(&cifs_tcp_ses_lock
);
2035 cifs_put_tcon(struct cifs_tcon
*tcon
)
2038 struct cifs_ses
*ses
;
2041 * IPC tcon share the lifetime of their session and are
2042 * destroyed in the session put function
2044 if (tcon
== NULL
|| tcon
->ipc
)
2048 cifs_dbg(FYI
, "%s: tc_count=%d\n", __func__
, tcon
->tc_count
);
2049 spin_lock(&cifs_tcp_ses_lock
);
2050 if (--tcon
->tc_count
> 0) {
2051 spin_unlock(&cifs_tcp_ses_lock
);
2055 /* tc_count can never go negative */
2056 WARN_ON(tcon
->tc_count
< 0);
2058 if (tcon
->use_witness
) {
2061 rc
= cifs_swn_unregister(tcon
);
2063 cifs_dbg(VFS
, "%s: Failed to unregister for witness notifications: %d\n",
2068 list_del_init(&tcon
->tcon_list
);
2069 spin_unlock(&cifs_tcp_ses_lock
);
2072 if (ses
->server
->ops
->tree_disconnect
)
2073 ses
->server
->ops
->tree_disconnect(xid
, tcon
);
2076 cifs_fscache_release_super_cookie(tcon
);
2078 cifs_put_smb_ses(ses
);
2082 * cifs_get_tcon - get a tcon matching @ctx data from @ses
2083 * @ses: smb session to issue the request on
2084 * @ctx: the superblock configuration context to use for building the
2086 * - tcon refcount is the number of mount points using the tcon.
2087 * - ses refcount is the number of tcon using the session.
2089 * 1. This function assumes it is being called from cifs_mount() where
2090 * we already got a session reference (ses refcount +1).
2092 * 2. Since we're in the context of adding a mount point, the end
2093 * result should be either:
2095 * a) a new tcon already allocated with refcount=1 (1 mount point) and
2096 * its session refcount incremented (1 new tcon). This +1 was
2097 * already done in (1).
2099 * b) an existing tcon with refcount+1 (add a mount point to it) and
2100 * identical ses refcount (no new tcon). Because of (1) we need to
2101 * decrement the ses refcount.
2103 static struct cifs_tcon
*
2104 cifs_get_tcon(struct cifs_ses
*ses
, struct smb3_fs_context
*ctx
)
2107 struct cifs_tcon
*tcon
;
2109 tcon
= cifs_find_tcon(ses
, ctx
);
2112 * tcon has refcount already incremented but we need to
2113 * decrement extra ses reference gotten by caller (case b)
2115 cifs_dbg(FYI
, "Found match on UNC path\n");
2116 cifs_put_smb_ses(ses
);
2120 if (!ses
->server
->ops
->tree_connect
) {
2125 tcon
= tconInfoAlloc();
2131 if (ctx
->snapshot_time
) {
2132 if (ses
->server
->vals
->protocol_id
== 0) {
2134 "Use SMB2 or later for snapshot mount option\n");
2138 tcon
->snapshot_time
= ctx
->snapshot_time
;
2141 if (ctx
->handle_timeout
) {
2142 if (ses
->server
->vals
->protocol_id
== 0) {
2144 "Use SMB2.1 or later for handle timeout option\n");
2148 tcon
->handle_timeout
= ctx
->handle_timeout
;
2152 if (ctx
->password
) {
2153 tcon
->password
= kstrdup(ctx
->password
, GFP_KERNEL
);
2154 if (!tcon
->password
) {
2161 if (ses
->server
->vals
->protocol_id
== 0) {
2163 "SMB3 or later required for encryption\n");
2166 } else if (tcon
->ses
->server
->capabilities
&
2167 SMB2_GLOBAL_CAP_ENCRYPTION
)
2170 cifs_dbg(VFS
, "Encryption is not supported on share\n");
2176 if (ctx
->linux_ext
) {
2177 if (ses
->server
->posix_ext_supported
) {
2178 tcon
->posix_extensions
= true;
2179 pr_warn_once("SMB3.11 POSIX Extensions are experimental\n");
2181 cifs_dbg(VFS
, "Server does not support mounting with posix SMB3.11 extensions\n");
2188 * BB Do we need to wrap session_mutex around this TCon call and Unix
2189 * SetFS as we do on SessSetup and reconnect?
2192 rc
= ses
->server
->ops
->tree_connect(xid
, ses
, ctx
->UNC
, tcon
,
2195 cifs_dbg(FYI
, "Tcon rc = %d\n", rc
);
2199 tcon
->use_persistent
= false;
2200 /* check if SMB2 or later, CIFS does not support persistent handles */
2201 if (ctx
->persistent
) {
2202 if (ses
->server
->vals
->protocol_id
== 0) {
2204 "SMB3 or later required for persistent handles\n");
2207 } else if (ses
->server
->capabilities
&
2208 SMB2_GLOBAL_CAP_PERSISTENT_HANDLES
)
2209 tcon
->use_persistent
= true;
2210 else /* persistent handles requested but not supported */ {
2212 "Persistent handles not supported on share\n");
2216 } else if ((tcon
->capabilities
& SMB2_SHARE_CAP_CONTINUOUS_AVAILABILITY
)
2217 && (ses
->server
->capabilities
& SMB2_GLOBAL_CAP_PERSISTENT_HANDLES
)
2218 && (ctx
->nopersistent
== false)) {
2219 cifs_dbg(FYI
, "enabling persistent handles\n");
2220 tcon
->use_persistent
= true;
2221 } else if (ctx
->resilient
) {
2222 if (ses
->server
->vals
->protocol_id
== 0) {
2224 "SMB2.1 or later required for resilient handles\n");
2228 tcon
->use_resilient
= true;
2231 tcon
->use_witness
= false;
2232 if (IS_ENABLED(CONFIG_CIFS_SWN_UPCALL
) && ctx
->witness
) {
2233 if (ses
->server
->vals
->protocol_id
>= SMB30_PROT_ID
) {
2234 if (tcon
->capabilities
& SMB2_SHARE_CAP_CLUSTER
) {
2236 * Set witness in use flag in first place
2237 * to retry registration in the echo task
2239 tcon
->use_witness
= true;
2240 /* And try to register immediately */
2241 rc
= cifs_swn_register(tcon
);
2243 cifs_dbg(VFS
, "Failed to register for witness notifications: %d\n", rc
);
2247 /* TODO: try to extend for non-cluster uses (eg multichannel) */
2248 cifs_dbg(VFS
, "witness requested on mount but no CLUSTER capability on share\n");
2253 cifs_dbg(VFS
, "SMB3 or later required for witness option\n");
2259 /* If the user really knows what they are doing they can override */
2260 if (tcon
->share_flags
& SMB2_SHAREFLAG_NO_CACHING
) {
2262 cifs_dbg(VFS
, "cache=ro requested on mount but NO_CACHING flag set on share\n");
2263 else if (ctx
->cache_rw
)
2264 cifs_dbg(VFS
, "cache=singleclient requested on mount but NO_CACHING flag set on share\n");
2267 if (ctx
->no_lease
) {
2268 if (ses
->server
->vals
->protocol_id
== 0) {
2270 "SMB2 or later required for nolease option\n");
2274 tcon
->no_lease
= ctx
->no_lease
;
2278 * We can have only one retry value for a connection to a share so for
2279 * resources mounted more than once to the same server share the last
2280 * value passed in for the retry flag is used.
2282 tcon
->retry
= ctx
->retry
;
2283 tcon
->nocase
= ctx
->nocase
;
2284 if (ses
->server
->capabilities
& SMB2_GLOBAL_CAP_DIRECTORY_LEASING
)
2285 tcon
->nohandlecache
= ctx
->nohandlecache
;
2287 tcon
->nohandlecache
= true;
2288 tcon
->nodelete
= ctx
->nodelete
;
2289 tcon
->local_lease
= ctx
->local_lease
;
2290 INIT_LIST_HEAD(&tcon
->pending_opens
);
2292 spin_lock(&cifs_tcp_ses_lock
);
2293 list_add(&tcon
->tcon_list
, &ses
->tcon_list
);
2294 spin_unlock(&cifs_tcp_ses_lock
);
2296 cifs_fscache_get_super_cookie(tcon
);
2306 cifs_put_tlink(struct tcon_link
*tlink
)
2308 if (!tlink
|| IS_ERR(tlink
))
2311 if (!atomic_dec_and_test(&tlink
->tl_count
) ||
2312 test_bit(TCON_LINK_IN_TREE
, &tlink
->tl_flags
)) {
2313 tlink
->tl_time
= jiffies
;
2317 if (!IS_ERR(tlink_tcon(tlink
)))
2318 cifs_put_tcon(tlink_tcon(tlink
));
2324 compare_mount_options(struct super_block
*sb
, struct cifs_mnt_data
*mnt_data
)
2326 struct cifs_sb_info
*old
= CIFS_SB(sb
);
2327 struct cifs_sb_info
*new = mnt_data
->cifs_sb
;
2328 unsigned int oldflags
= old
->mnt_cifs_flags
& CIFS_MOUNT_MASK
;
2329 unsigned int newflags
= new->mnt_cifs_flags
& CIFS_MOUNT_MASK
;
2331 if ((sb
->s_flags
& CIFS_MS_MASK
) != (mnt_data
->flags
& CIFS_MS_MASK
))
2334 if (old
->mnt_cifs_serverino_autodisabled
)
2335 newflags
&= ~CIFS_MOUNT_SERVER_INUM
;
2337 if (oldflags
!= newflags
)
2341 * We want to share sb only if we don't specify an r/wsize or
2342 * specified r/wsize is greater than or equal to existing one.
2344 if (new->ctx
->wsize
&& new->ctx
->wsize
< old
->ctx
->wsize
)
2347 if (new->ctx
->rsize
&& new->ctx
->rsize
< old
->ctx
->rsize
)
2350 if (!uid_eq(old
->ctx
->linux_uid
, new->ctx
->linux_uid
) ||
2351 !gid_eq(old
->ctx
->linux_gid
, new->ctx
->linux_gid
))
2354 if (old
->ctx
->file_mode
!= new->ctx
->file_mode
||
2355 old
->ctx
->dir_mode
!= new->ctx
->dir_mode
)
2358 if (strcmp(old
->local_nls
->charset
, new->local_nls
->charset
))
2361 if (old
->ctx
->acregmax
!= new->ctx
->acregmax
)
2363 if (old
->ctx
->acdirmax
!= new->ctx
->acdirmax
)
2370 match_prepath(struct super_block
*sb
, struct cifs_mnt_data
*mnt_data
)
2372 struct cifs_sb_info
*old
= CIFS_SB(sb
);
2373 struct cifs_sb_info
*new = mnt_data
->cifs_sb
;
2374 bool old_set
= (old
->mnt_cifs_flags
& CIFS_MOUNT_USE_PREFIX_PATH
) &&
2376 bool new_set
= (new->mnt_cifs_flags
& CIFS_MOUNT_USE_PREFIX_PATH
) &&
2379 if (old_set
&& new_set
&& !strcmp(new->prepath
, old
->prepath
))
2381 else if (!old_set
&& !new_set
)
2388 cifs_match_super(struct super_block
*sb
, void *data
)
2390 struct cifs_mnt_data
*mnt_data
= (struct cifs_mnt_data
*)data
;
2391 struct smb3_fs_context
*ctx
;
2392 struct cifs_sb_info
*cifs_sb
;
2393 struct TCP_Server_Info
*tcp_srv
;
2394 struct cifs_ses
*ses
;
2395 struct cifs_tcon
*tcon
;
2396 struct tcon_link
*tlink
;
2399 spin_lock(&cifs_tcp_ses_lock
);
2400 cifs_sb
= CIFS_SB(sb
);
2401 tlink
= cifs_get_tlink(cifs_sb_master_tlink(cifs_sb
));
2402 if (tlink
== NULL
) {
2403 /* can not match superblock if tlink were ever null */
2404 spin_unlock(&cifs_tcp_ses_lock
);
2407 tcon
= tlink_tcon(tlink
);
2409 tcp_srv
= ses
->server
;
2411 ctx
= mnt_data
->ctx
;
2413 if (!match_server(tcp_srv
, ctx
) ||
2414 !match_session(ses
, ctx
) ||
2415 !match_tcon(tcon
, ctx
) ||
2416 !match_prepath(sb
, mnt_data
)) {
2421 rc
= compare_mount_options(sb
, mnt_data
);
2423 spin_unlock(&cifs_tcp_ses_lock
);
2424 cifs_put_tlink(tlink
);
2428 #ifdef CONFIG_DEBUG_LOCK_ALLOC
2429 static struct lock_class_key cifs_key
[2];
2430 static struct lock_class_key cifs_slock_key
[2];
2433 cifs_reclassify_socket4(struct socket
*sock
)
2435 struct sock
*sk
= sock
->sk
;
2436 BUG_ON(!sock_allow_reclassification(sk
));
2437 sock_lock_init_class_and_name(sk
, "slock-AF_INET-CIFS",
2438 &cifs_slock_key
[0], "sk_lock-AF_INET-CIFS", &cifs_key
[0]);
2442 cifs_reclassify_socket6(struct socket
*sock
)
2444 struct sock
*sk
= sock
->sk
;
2445 BUG_ON(!sock_allow_reclassification(sk
));
2446 sock_lock_init_class_and_name(sk
, "slock-AF_INET6-CIFS",
2447 &cifs_slock_key
[1], "sk_lock-AF_INET6-CIFS", &cifs_key
[1]);
2451 cifs_reclassify_socket4(struct socket
*sock
)
2456 cifs_reclassify_socket6(struct socket
*sock
)
2461 /* See RFC1001 section 14 on representation of Netbios names */
2462 static void rfc1002mangle(char *target
, char *source
, unsigned int length
)
2466 for (i
= 0, j
= 0; i
< (length
); i
++) {
2467 /* mask a nibble at a time and encode */
2468 target
[j
] = 'A' + (0x0F & (source
[i
] >> 4));
2469 target
[j
+1] = 'A' + (0x0F & source
[i
]);
2476 bind_socket(struct TCP_Server_Info
*server
)
2479 if (server
->srcaddr
.ss_family
!= AF_UNSPEC
) {
2480 /* Bind to the specified local IP address */
2481 struct socket
*socket
= server
->ssocket
;
2482 rc
= socket
->ops
->bind(socket
,
2483 (struct sockaddr
*) &server
->srcaddr
,
2484 sizeof(server
->srcaddr
));
2486 struct sockaddr_in
*saddr4
;
2487 struct sockaddr_in6
*saddr6
;
2488 saddr4
= (struct sockaddr_in
*)&server
->srcaddr
;
2489 saddr6
= (struct sockaddr_in6
*)&server
->srcaddr
;
2490 if (saddr6
->sin6_family
== AF_INET6
)
2491 cifs_server_dbg(VFS
, "Failed to bind to: %pI6c, error: %d\n",
2492 &saddr6
->sin6_addr
, rc
);
2494 cifs_server_dbg(VFS
, "Failed to bind to: %pI4, error: %d\n",
2495 &saddr4
->sin_addr
.s_addr
, rc
);
2502 ip_rfc1001_connect(struct TCP_Server_Info
*server
)
2506 * some servers require RFC1001 sessinit before sending
2507 * negprot - BB check reconnection in case where second
2508 * sessinit is sent but no second negprot
2510 struct rfc1002_session_packet
*ses_init_buf
;
2511 struct smb_hdr
*smb_buf
;
2512 ses_init_buf
= kzalloc(sizeof(struct rfc1002_session_packet
),
2515 ses_init_buf
->trailer
.session_req
.called_len
= 32;
2517 if (server
->server_RFC1001_name
[0] != 0)
2518 rfc1002mangle(ses_init_buf
->trailer
.
2519 session_req
.called_name
,
2520 server
->server_RFC1001_name
,
2521 RFC1001_NAME_LEN_WITH_NULL
);
2523 rfc1002mangle(ses_init_buf
->trailer
.
2524 session_req
.called_name
,
2525 DEFAULT_CIFS_CALLED_NAME
,
2526 RFC1001_NAME_LEN_WITH_NULL
);
2528 ses_init_buf
->trailer
.session_req
.calling_len
= 32;
2531 * calling name ends in null (byte 16) from old smb
2534 if (server
->workstation_RFC1001_name
[0] != 0)
2535 rfc1002mangle(ses_init_buf
->trailer
.
2536 session_req
.calling_name
,
2537 server
->workstation_RFC1001_name
,
2538 RFC1001_NAME_LEN_WITH_NULL
);
2540 rfc1002mangle(ses_init_buf
->trailer
.
2541 session_req
.calling_name
,
2543 RFC1001_NAME_LEN_WITH_NULL
);
2545 ses_init_buf
->trailer
.session_req
.scope1
= 0;
2546 ses_init_buf
->trailer
.session_req
.scope2
= 0;
2547 smb_buf
= (struct smb_hdr
*)ses_init_buf
;
2549 /* sizeof RFC1002_SESSION_REQUEST with no scope */
2550 smb_buf
->smb_buf_length
= cpu_to_be32(0x81000044);
2551 rc
= smb_send(server
, smb_buf
, 0x44);
2552 kfree(ses_init_buf
);
2554 * RFC1001 layer in at least one server
2555 * requires very short break before negprot
2556 * presumably because not expecting negprot
2557 * to follow so fast. This is a simple
2558 * solution that works without
2559 * complicating the code and causes no
2560 * significant slowing down on mount
2563 usleep_range(1000, 2000);
2566 * else the negprot may still work without this
2567 * even though malloc failed
2574 generic_ip_connect(struct TCP_Server_Info
*server
)
2579 struct socket
*socket
= server
->ssocket
;
2580 struct sockaddr
*saddr
;
2582 saddr
= (struct sockaddr
*) &server
->dstaddr
;
2584 if (server
->dstaddr
.ss_family
== AF_INET6
) {
2585 struct sockaddr_in6
*ipv6
= (struct sockaddr_in6
*)&server
->dstaddr
;
2587 sport
= ipv6
->sin6_port
;
2588 slen
= sizeof(struct sockaddr_in6
);
2590 cifs_dbg(FYI
, "%s: connecting to [%pI6]:%d\n", __func__
, &ipv6
->sin6_addr
,
2593 struct sockaddr_in
*ipv4
= (struct sockaddr_in
*)&server
->dstaddr
;
2595 sport
= ipv4
->sin_port
;
2596 slen
= sizeof(struct sockaddr_in
);
2598 cifs_dbg(FYI
, "%s: connecting to %pI4:%d\n", __func__
, &ipv4
->sin_addr
,
2602 if (socket
== NULL
) {
2603 rc
= __sock_create(cifs_net_ns(server
), sfamily
, SOCK_STREAM
,
2604 IPPROTO_TCP
, &socket
, 1);
2606 cifs_server_dbg(VFS
, "Error %d creating socket\n", rc
);
2607 server
->ssocket
= NULL
;
2611 /* BB other socket options to set KEEPALIVE, NODELAY? */
2612 cifs_dbg(FYI
, "Socket created\n");
2613 server
->ssocket
= socket
;
2614 socket
->sk
->sk_allocation
= GFP_NOFS
;
2615 if (sfamily
== AF_INET6
)
2616 cifs_reclassify_socket6(socket
);
2618 cifs_reclassify_socket4(socket
);
2621 rc
= bind_socket(server
);
2626 * Eventually check for other socket options to change from
2627 * the default. sock_setsockopt not used because it expects
2630 socket
->sk
->sk_rcvtimeo
= 7 * HZ
;
2631 socket
->sk
->sk_sndtimeo
= 5 * HZ
;
2633 /* make the bufsizes depend on wsize/rsize and max requests */
2634 if (server
->noautotune
) {
2635 if (socket
->sk
->sk_sndbuf
< (200 * 1024))
2636 socket
->sk
->sk_sndbuf
= 200 * 1024;
2637 if (socket
->sk
->sk_rcvbuf
< (140 * 1024))
2638 socket
->sk
->sk_rcvbuf
= 140 * 1024;
2641 if (server
->tcp_nodelay
)
2642 tcp_sock_set_nodelay(socket
->sk
);
2644 cifs_dbg(FYI
, "sndbuf %d rcvbuf %d rcvtimeo 0x%lx\n",
2645 socket
->sk
->sk_sndbuf
,
2646 socket
->sk
->sk_rcvbuf
, socket
->sk
->sk_rcvtimeo
);
2648 rc
= socket
->ops
->connect(socket
, saddr
, slen
,
2649 server
->noblockcnt
? O_NONBLOCK
: 0);
2651 * When mounting SMB root file systems, we do not want to block in
2652 * connect. Otherwise bail out and then let cifs_reconnect() perform
2653 * reconnect failover - if possible.
2655 if (server
->noblockcnt
&& rc
== -EINPROGRESS
)
2658 cifs_dbg(FYI
, "Error %d connecting to server\n", rc
);
2659 sock_release(socket
);
2660 server
->ssocket
= NULL
;
2664 if (sport
== htons(RFC1001_PORT
))
2665 rc
= ip_rfc1001_connect(server
);
2671 ip_connect(struct TCP_Server_Info
*server
)
2674 struct sockaddr_in6
*addr6
= (struct sockaddr_in6
*)&server
->dstaddr
;
2675 struct sockaddr_in
*addr
= (struct sockaddr_in
*)&server
->dstaddr
;
2677 if (server
->dstaddr
.ss_family
== AF_INET6
)
2678 sport
= &addr6
->sin6_port
;
2680 sport
= &addr
->sin_port
;
2685 /* try with 445 port at first */
2686 *sport
= htons(CIFS_PORT
);
2688 rc
= generic_ip_connect(server
);
2692 /* if it failed, try with 139 port */
2693 *sport
= htons(RFC1001_PORT
);
2696 return generic_ip_connect(server
);
2699 void reset_cifs_unix_caps(unsigned int xid
, struct cifs_tcon
*tcon
,
2700 struct cifs_sb_info
*cifs_sb
, struct smb3_fs_context
*ctx
)
2703 * If we are reconnecting then should we check to see if
2704 * any requested capabilities changed locally e.g. via
2705 * remount but we can not do much about it here
2706 * if they have (even if we could detect it by the following)
2707 * Perhaps we could add a backpointer to array of sb from tcon
2708 * or if we change to make all sb to same share the same
2709 * sb as NFS - then we only have one backpointer to sb.
2710 * What if we wanted to mount the server share twice once with
2711 * and once without posixacls or posix paths?
2713 __u64 saved_cap
= le64_to_cpu(tcon
->fsUnixInfo
.Capability
);
2715 if (ctx
&& ctx
->no_linux_ext
) {
2716 tcon
->fsUnixInfo
.Capability
= 0;
2717 tcon
->unix_ext
= 0; /* Unix Extensions disabled */
2718 cifs_dbg(FYI
, "Linux protocol extensions disabled\n");
2721 tcon
->unix_ext
= 1; /* Unix Extensions supported */
2723 if (!tcon
->unix_ext
) {
2724 cifs_dbg(FYI
, "Unix extensions disabled so not set on reconnect\n");
2728 if (!CIFSSMBQFSUnixInfo(xid
, tcon
)) {
2729 __u64 cap
= le64_to_cpu(tcon
->fsUnixInfo
.Capability
);
2730 cifs_dbg(FYI
, "unix caps which server supports %lld\n", cap
);
2732 * check for reconnect case in which we do not
2733 * want to change the mount behavior if we can avoid it
2737 * turn off POSIX ACL and PATHNAMES if not set
2738 * originally at mount time
2740 if ((saved_cap
& CIFS_UNIX_POSIX_ACL_CAP
) == 0)
2741 cap
&= ~CIFS_UNIX_POSIX_ACL_CAP
;
2742 if ((saved_cap
& CIFS_UNIX_POSIX_PATHNAMES_CAP
) == 0) {
2743 if (cap
& CIFS_UNIX_POSIX_PATHNAMES_CAP
)
2744 cifs_dbg(VFS
, "POSIXPATH support change\n");
2745 cap
&= ~CIFS_UNIX_POSIX_PATHNAMES_CAP
;
2746 } else if ((cap
& CIFS_UNIX_POSIX_PATHNAMES_CAP
) == 0) {
2747 cifs_dbg(VFS
, "possible reconnect error\n");
2748 cifs_dbg(VFS
, "server disabled POSIX path support\n");
2752 if (cap
& CIFS_UNIX_TRANSPORT_ENCRYPTION_MANDATORY_CAP
)
2753 cifs_dbg(VFS
, "per-share encryption not supported yet\n");
2755 cap
&= CIFS_UNIX_CAP_MASK
;
2756 if (ctx
&& ctx
->no_psx_acl
)
2757 cap
&= ~CIFS_UNIX_POSIX_ACL_CAP
;
2758 else if (CIFS_UNIX_POSIX_ACL_CAP
& cap
) {
2759 cifs_dbg(FYI
, "negotiated posix acl support\n");
2761 cifs_sb
->mnt_cifs_flags
|=
2762 CIFS_MOUNT_POSIXACL
;
2765 if (ctx
&& ctx
->posix_paths
== 0)
2766 cap
&= ~CIFS_UNIX_POSIX_PATHNAMES_CAP
;
2767 else if (cap
& CIFS_UNIX_POSIX_PATHNAMES_CAP
) {
2768 cifs_dbg(FYI
, "negotiate posix pathnames\n");
2770 cifs_sb
->mnt_cifs_flags
|=
2771 CIFS_MOUNT_POSIX_PATHS
;
2774 cifs_dbg(FYI
, "Negotiate caps 0x%x\n", (int)cap
);
2775 #ifdef CONFIG_CIFS_DEBUG2
2776 if (cap
& CIFS_UNIX_FCNTL_CAP
)
2777 cifs_dbg(FYI
, "FCNTL cap\n");
2778 if (cap
& CIFS_UNIX_EXTATTR_CAP
)
2779 cifs_dbg(FYI
, "EXTATTR cap\n");
2780 if (cap
& CIFS_UNIX_POSIX_PATHNAMES_CAP
)
2781 cifs_dbg(FYI
, "POSIX path cap\n");
2782 if (cap
& CIFS_UNIX_XATTR_CAP
)
2783 cifs_dbg(FYI
, "XATTR cap\n");
2784 if (cap
& CIFS_UNIX_POSIX_ACL_CAP
)
2785 cifs_dbg(FYI
, "POSIX ACL cap\n");
2786 if (cap
& CIFS_UNIX_LARGE_READ_CAP
)
2787 cifs_dbg(FYI
, "very large read cap\n");
2788 if (cap
& CIFS_UNIX_LARGE_WRITE_CAP
)
2789 cifs_dbg(FYI
, "very large write cap\n");
2790 if (cap
& CIFS_UNIX_TRANSPORT_ENCRYPTION_CAP
)
2791 cifs_dbg(FYI
, "transport encryption cap\n");
2792 if (cap
& CIFS_UNIX_TRANSPORT_ENCRYPTION_MANDATORY_CAP
)
2793 cifs_dbg(FYI
, "mandatory transport encryption cap\n");
2794 #endif /* CIFS_DEBUG2 */
2795 if (CIFSSMBSetFSUnixInfo(xid
, tcon
, cap
)) {
2797 cifs_dbg(FYI
, "resetting capabilities failed\n");
2799 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");
2805 int cifs_setup_cifs_sb(struct cifs_sb_info
*cifs_sb
)
2807 struct smb3_fs_context
*ctx
= cifs_sb
->ctx
;
2809 INIT_DELAYED_WORK(&cifs_sb
->prune_tlinks
, cifs_prune_tlinks
);
2811 spin_lock_init(&cifs_sb
->tlink_tree_lock
);
2812 cifs_sb
->tlink_tree
= RB_ROOT
;
2814 cifs_dbg(FYI
, "file mode: %04ho dir mode: %04ho\n",
2815 ctx
->file_mode
, ctx
->dir_mode
);
2817 /* this is needed for ASCII cp to Unicode converts */
2818 if (ctx
->iocharset
== NULL
) {
2819 /* load_nls_default cannot return null */
2820 cifs_sb
->local_nls
= load_nls_default();
2822 cifs_sb
->local_nls
= load_nls(ctx
->iocharset
);
2823 if (cifs_sb
->local_nls
== NULL
) {
2824 cifs_dbg(VFS
, "CIFS mount error: iocharset %s not found\n",
2829 ctx
->local_nls
= cifs_sb
->local_nls
;
2831 smb3_update_mnt_flags(cifs_sb
);
2834 cifs_dbg(FYI
, "mounting share using direct i/o\n");
2835 if (ctx
->cache_ro
) {
2836 cifs_dbg(VFS
, "mounting share with read only caching. Ensure that the share will not be modified while in use.\n");
2837 cifs_sb
->mnt_cifs_flags
|= CIFS_MOUNT_RO_CACHE
;
2838 } else if (ctx
->cache_rw
) {
2839 cifs_dbg(VFS
, "mounting share in single client RW caching mode. Ensure that no other systems will be accessing the share.\n");
2840 cifs_sb
->mnt_cifs_flags
|= (CIFS_MOUNT_RO_CACHE
|
2841 CIFS_MOUNT_RW_CACHE
);
2844 if ((ctx
->cifs_acl
) && (ctx
->dynperm
))
2845 cifs_dbg(VFS
, "mount option dynperm ignored if cifsacl mount option supported\n");
2848 cifs_sb
->prepath
= kstrdup(ctx
->prepath
, GFP_KERNEL
);
2849 if (cifs_sb
->prepath
== NULL
)
2851 cifs_sb
->mnt_cifs_flags
|= CIFS_MOUNT_USE_PREFIX_PATH
;
2857 /* Release all succeed connections */
2858 static inline void mount_put_conns(struct cifs_sb_info
*cifs_sb
,
2860 struct TCP_Server_Info
*server
,
2861 struct cifs_ses
*ses
, struct cifs_tcon
*tcon
)
2866 cifs_put_tcon(tcon
);
2868 cifs_put_smb_ses(ses
);
2870 cifs_put_tcp_session(server
, 0);
2871 cifs_sb
->mnt_cifs_flags
&= ~CIFS_MOUNT_POSIX_PATHS
;
2875 /* Get connections for tcp, ses and tcon */
2876 static int mount_get_conns(struct smb3_fs_context
*ctx
, struct cifs_sb_info
*cifs_sb
,
2878 struct TCP_Server_Info
**nserver
,
2879 struct cifs_ses
**nses
, struct cifs_tcon
**ntcon
)
2882 struct TCP_Server_Info
*server
;
2883 struct cifs_ses
*ses
;
2884 struct cifs_tcon
*tcon
;
2892 /* get a reference to a tcp session */
2893 server
= cifs_get_tcp_session(ctx
);
2894 if (IS_ERR(server
)) {
2895 rc
= PTR_ERR(server
);
2901 /* get a reference to a SMB session */
2902 ses
= cifs_get_smb_ses(server
, ctx
);
2910 if ((ctx
->persistent
== true) && (!(ses
->server
->capabilities
&
2911 SMB2_GLOBAL_CAP_PERSISTENT_HANDLES
))) {
2912 cifs_server_dbg(VFS
, "persistent handles not supported by server\n");
2916 /* search for existing tcon to this server share */
2917 tcon
= cifs_get_tcon(ses
, ctx
);
2925 /* if new SMB3.11 POSIX extensions are supported do not remap / and \ */
2926 if (tcon
->posix_extensions
)
2927 cifs_sb
->mnt_cifs_flags
|= CIFS_MOUNT_POSIX_PATHS
;
2929 /* tell server which Unix caps we support */
2930 if (cap_unix(tcon
->ses
)) {
2932 * reset of caps checks mount to see if unix extensions disabled
2933 * for just this mount.
2935 reset_cifs_unix_caps(*xid
, tcon
, cifs_sb
, ctx
);
2936 if ((tcon
->ses
->server
->tcpStatus
== CifsNeedReconnect
) &&
2937 (le64_to_cpu(tcon
->fsUnixInfo
.Capability
) &
2938 CIFS_UNIX_TRANSPORT_ENCRYPTION_MANDATORY_CAP
))
2941 tcon
->unix_ext
= 0; /* server does not support them */
2943 /* do not care if a following call succeed - informational */
2944 if (!tcon
->pipe
&& server
->ops
->qfs_tcon
) {
2945 server
->ops
->qfs_tcon(*xid
, tcon
, cifs_sb
);
2946 if (cifs_sb
->mnt_cifs_flags
& CIFS_MOUNT_RO_CACHE
) {
2947 if (tcon
->fsDevInfo
.DeviceCharacteristics
&
2948 cpu_to_le32(FILE_READ_ONLY_DEVICE
))
2949 cifs_dbg(VFS
, "mounted to read only share\n");
2950 else if ((cifs_sb
->mnt_cifs_flags
&
2951 CIFS_MOUNT_RW_CACHE
) == 0)
2952 cifs_dbg(VFS
, "read only mount of RW share\n");
2953 /* no need to log a RW mount of a typical RW share */
2958 * Clamp the rsize/wsize mount arguments if they are too big for the server
2959 * and set the rsize/wsize to the negotiated values if not passed in by
2962 if ((cifs_sb
->ctx
->wsize
== 0) ||
2963 (cifs_sb
->ctx
->wsize
> server
->ops
->negotiate_wsize(tcon
, ctx
)))
2964 cifs_sb
->ctx
->wsize
= server
->ops
->negotiate_wsize(tcon
, ctx
);
2965 if ((cifs_sb
->ctx
->rsize
== 0) ||
2966 (cifs_sb
->ctx
->rsize
> server
->ops
->negotiate_rsize(tcon
, ctx
)))
2967 cifs_sb
->ctx
->rsize
= server
->ops
->negotiate_rsize(tcon
, ctx
);
2972 static int mount_setup_tlink(struct cifs_sb_info
*cifs_sb
, struct cifs_ses
*ses
,
2973 struct cifs_tcon
*tcon
)
2975 struct tcon_link
*tlink
;
2977 /* hang the tcon off of the superblock */
2978 tlink
= kzalloc(sizeof(*tlink
), GFP_KERNEL
);
2982 tlink
->tl_uid
= ses
->linux_uid
;
2983 tlink
->tl_tcon
= tcon
;
2984 tlink
->tl_time
= jiffies
;
2985 set_bit(TCON_LINK_MASTER
, &tlink
->tl_flags
);
2986 set_bit(TCON_LINK_IN_TREE
, &tlink
->tl_flags
);
2988 cifs_sb
->master_tlink
= tlink
;
2989 spin_lock(&cifs_sb
->tlink_tree_lock
);
2990 tlink_rb_insert(&cifs_sb
->tlink_tree
, tlink
);
2991 spin_unlock(&cifs_sb
->tlink_tree_lock
);
2993 queue_delayed_work(cifsiod_wq
, &cifs_sb
->prune_tlinks
,
2998 #ifdef CONFIG_CIFS_DFS_UPCALL
2999 static int mount_get_dfs_conns(struct smb3_fs_context
*ctx
, struct cifs_sb_info
*cifs_sb
,
3000 unsigned int *xid
, struct TCP_Server_Info
**nserver
,
3001 struct cifs_ses
**nses
, struct cifs_tcon
**ntcon
)
3005 ctx
->nosharesock
= true;
3006 rc
= mount_get_conns(ctx
, cifs_sb
, xid
, nserver
, nses
, ntcon
);
3008 cifs_dbg(FYI
, "%s: marking tcp session as a dfs connection\n", __func__
);
3009 spin_lock(&cifs_tcp_ses_lock
);
3010 (*nserver
)->is_dfs_conn
= true;
3011 spin_unlock(&cifs_tcp_ses_lock
);
3017 * cifs_build_path_to_root returns full path to root when we do not have an
3018 * existing connection (tcon)
3021 build_unc_path_to_root(const struct smb3_fs_context
*ctx
,
3022 const struct cifs_sb_info
*cifs_sb
, bool useppath
)
3024 char *full_path
, *pos
;
3025 unsigned int pplen
= useppath
&& ctx
->prepath
?
3026 strlen(ctx
->prepath
) + 1 : 0;
3027 unsigned int unc_len
= strnlen(ctx
->UNC
, MAX_TREE_SIZE
+ 1);
3029 if (unc_len
> MAX_TREE_SIZE
)
3030 return ERR_PTR(-EINVAL
);
3032 full_path
= kmalloc(unc_len
+ pplen
+ 1, GFP_KERNEL
);
3033 if (full_path
== NULL
)
3034 return ERR_PTR(-ENOMEM
);
3036 memcpy(full_path
, ctx
->UNC
, unc_len
);
3037 pos
= full_path
+ unc_len
;
3040 *pos
= CIFS_DIR_SEP(cifs_sb
);
3041 memcpy(pos
+ 1, ctx
->prepath
, pplen
);
3045 *pos
= '\0'; /* add trailing null */
3046 convert_delimiter(full_path
, CIFS_DIR_SEP(cifs_sb
));
3047 cifs_dbg(FYI
, "%s: full_path=%s\n", __func__
, full_path
);
3052 * expand_dfs_referral - Perform a dfs referral query and update the cifs_sb
3054 * If a referral is found, cifs_sb->ctx->mount_options will be (re-)allocated
3055 * to a string containing updated options for the submount. Otherwise it
3056 * will be left untouched.
3058 * Returns the rc from get_dfs_path to the caller, which can be used to
3059 * determine whether there were referrals.
3062 expand_dfs_referral(const unsigned int xid
, struct cifs_ses
*ses
,
3063 struct smb3_fs_context
*ctx
, struct cifs_sb_info
*cifs_sb
,
3067 struct dfs_info3_param referral
= {0};
3068 char *full_path
= NULL
, *mdata
= NULL
;
3070 if (cifs_sb
->mnt_cifs_flags
& CIFS_MOUNT_NO_DFS
)
3073 full_path
= build_unc_path_to_root(ctx
, cifs_sb
, true);
3074 if (IS_ERR(full_path
))
3075 return PTR_ERR(full_path
);
3077 rc
= dfs_cache_find(xid
, ses
, cifs_sb
->local_nls
, cifs_remap(cifs_sb
),
3078 ref_path
, &referral
, NULL
);
3080 char *fake_devname
= NULL
;
3082 mdata
= cifs_compose_mount_options(cifs_sb
->ctx
->mount_options
,
3083 full_path
+ 1, &referral
,
3085 free_dfs_info_param(&referral
);
3087 if (IS_ERR(mdata
)) {
3088 rc
= PTR_ERR(mdata
);
3092 * We can not clear out the whole structure since we
3093 * no longer have an explicit function to parse
3094 * a mount-string. Instead we need to clear out the
3095 * individual fields that are no longer valid.
3097 kfree(ctx
->prepath
);
3098 ctx
->prepath
= NULL
;
3099 rc
= cifs_setup_volume_info(ctx
, mdata
, fake_devname
);
3101 kfree(fake_devname
);
3102 kfree(cifs_sb
->ctx
->mount_options
);
3103 cifs_sb
->ctx
->mount_options
= mdata
;
3109 static int get_next_dfs_tgt(struct dfs_cache_tgt_list
*tgt_list
,
3110 struct dfs_cache_tgt_iterator
**tgt_it
)
3113 *tgt_it
= dfs_cache_get_tgt_iterator(tgt_list
);
3115 *tgt_it
= dfs_cache_get_next_tgt(tgt_list
, *tgt_it
);
3116 return !*tgt_it
? -EHOSTDOWN
: 0;
3119 static int update_vol_info(const struct dfs_cache_tgt_iterator
*tgt_it
,
3120 struct smb3_fs_context
*fake_ctx
, struct smb3_fs_context
*ctx
)
3122 const char *tgt
= dfs_cache_get_tgt_name(tgt_it
);
3123 int len
= strlen(tgt
) + 2;
3126 new_unc
= kmalloc(len
, GFP_KERNEL
);
3129 scnprintf(new_unc
, len
, "\\%s", tgt
);
3134 if (fake_ctx
->prepath
) {
3135 kfree(ctx
->prepath
);
3136 ctx
->prepath
= fake_ctx
->prepath
;
3137 fake_ctx
->prepath
= NULL
;
3139 memcpy(&ctx
->dstaddr
, &fake_ctx
->dstaddr
, sizeof(ctx
->dstaddr
));
3144 static int do_dfs_failover(const char *path
, const char *full_path
, struct cifs_sb_info
*cifs_sb
,
3145 struct smb3_fs_context
*ctx
, struct cifs_ses
*root_ses
,
3146 unsigned int *xid
, struct TCP_Server_Info
**server
,
3147 struct cifs_ses
**ses
, struct cifs_tcon
**tcon
)
3151 struct dfs_cache_tgt_list tgt_list
= DFS_CACHE_TGT_LIST_INIT(tgt_list
);
3152 struct dfs_cache_tgt_iterator
*tgt_it
= NULL
;
3153 struct smb3_fs_context tmp_ctx
= {NULL
};
3155 if (cifs_sb
->mnt_cifs_flags
& CIFS_MOUNT_NO_DFS
)
3158 npath
= dfs_cache_canonical_path(path
, cifs_sb
->local_nls
, cifs_remap(cifs_sb
));
3160 return PTR_ERR(npath
);
3162 cifs_dbg(FYI
, "%s: path=%s full_path=%s\n", __func__
, npath
, full_path
);
3164 rc
= dfs_cache_noreq_find(npath
, NULL
, &tgt_list
);
3168 * We use a 'tmp_ctx' here because we need pass it down to the mount_{get,put} functions to
3169 * test connection against new DFS targets.
3171 rc
= smb3_fs_context_dup(&tmp_ctx
, ctx
);
3176 struct dfs_info3_param ref
= {0};
3177 char *fake_devname
= NULL
, *mdata
= NULL
;
3179 /* Get next DFS target server - if any */
3180 rc
= get_next_dfs_tgt(&tgt_list
, &tgt_it
);
3184 rc
= dfs_cache_get_tgt_referral(npath
, tgt_it
, &ref
);
3188 cifs_dbg(FYI
, "%s: old ctx: UNC=%s prepath=%s\n", __func__
, tmp_ctx
.UNC
,
3191 mdata
= cifs_compose_mount_options(cifs_sb
->ctx
->mount_options
, full_path
+ 1, &ref
,
3193 free_dfs_info_param(&ref
);
3195 if (IS_ERR(mdata
)) {
3196 rc
= PTR_ERR(mdata
);
3199 rc
= cifs_setup_volume_info(&tmp_ctx
, mdata
, fake_devname
);
3202 kfree(fake_devname
);
3207 cifs_dbg(FYI
, "%s: new ctx: UNC=%s prepath=%s\n", __func__
, tmp_ctx
.UNC
,
3210 mount_put_conns(cifs_sb
, *xid
, *server
, *ses
, *tcon
);
3211 rc
= mount_get_dfs_conns(&tmp_ctx
, cifs_sb
, xid
, server
, ses
, tcon
);
3212 if (!rc
|| (*server
&& *ses
)) {
3214 * We were able to connect to new target server. Update current context with
3215 * new target server.
3217 rc
= update_vol_info(tgt_it
, &tmp_ctx
, ctx
);
3222 cifs_dbg(FYI
, "%s: final ctx: UNC=%s prepath=%s\n", __func__
, tmp_ctx
.UNC
,
3225 * Update DFS target hint in DFS referral cache with the target server we
3226 * successfully reconnected to.
3228 rc
= dfs_cache_update_tgthint(*xid
, root_ses
? root_ses
: *ses
, cifs_sb
->local_nls
,
3229 cifs_remap(cifs_sb
), path
, tgt_it
);
3234 smb3_cleanup_fs_context_contents(&tmp_ctx
);
3235 dfs_cache_free_tgts(&tgt_list
);
3240 /* TODO: all callers to this are broken. We are not parsing mount_options here
3241 * we should pass a clone of the original context?
3244 cifs_setup_volume_info(struct smb3_fs_context
*ctx
, const char *mntopts
, const char *devname
)
3249 cifs_dbg(FYI
, "%s: devname=%s\n", __func__
, devname
);
3250 rc
= smb3_parse_devname(devname
, ctx
);
3252 cifs_dbg(VFS
, "%s: failed to parse %s: %d\n", __func__
, devname
, rc
);
3260 rc
= smb3_parse_opt(mntopts
, "ip", &ip
);
3262 cifs_dbg(VFS
, "%s: failed to parse ip options: %d\n", __func__
, rc
);
3266 rc
= cifs_convert_address((struct sockaddr
*)&ctx
->dstaddr
, ip
, strlen(ip
));
3269 cifs_dbg(VFS
, "%s: failed to convert ip address\n", __func__
);
3274 if (ctx
->nullauth
) {
3275 cifs_dbg(FYI
, "Anonymous login\n");
3276 kfree(ctx
->username
);
3277 ctx
->username
= NULL
;
3278 } else if (ctx
->username
) {
3279 /* BB fixme parse for domain name here */
3280 cifs_dbg(FYI
, "Username: %s\n", ctx
->username
);
3282 cifs_dbg(VFS
, "No username specified\n");
3283 /* In userspace mount helper we can get user name from alternate
3284 locations such as env variables and files on disk */
3292 cifs_are_all_path_components_accessible(struct TCP_Server_Info
*server
,
3294 struct cifs_tcon
*tcon
,
3295 struct cifs_sb_info
*cifs_sb
,
3302 int skip
= added_treename
? 1 : 0;
3304 sep
= CIFS_DIR_SEP(cifs_sb
);
3307 rc
= server
->ops
->is_path_accessible(xid
, tcon
, cifs_sb
, "");
3309 /* skip separators */
3314 /* next separator */
3315 while (*s
&& *s
!= sep
)
3318 * if the treename is added, we then have to skip the first
3319 * part within the separators
3326 * temporarily null-terminate the path at the end of
3327 * the current component
3331 rc
= server
->ops
->is_path_accessible(xid
, tcon
, cifs_sb
,
3339 * Check if path is remote (e.g. a DFS share). Return -EREMOTE if it is,
3342 static int is_path_remote(struct cifs_sb_info
*cifs_sb
, struct smb3_fs_context
*ctx
,
3343 const unsigned int xid
,
3344 struct TCP_Server_Info
*server
,
3345 struct cifs_tcon
*tcon
)
3350 if (!server
->ops
->is_path_accessible
)
3354 * cifs_build_path_to_root works only when we have a valid tcon
3356 full_path
= cifs_build_path_to_root(ctx
, cifs_sb
, tcon
,
3357 tcon
->Flags
& SMB_SHARE_IS_IN_DFS
);
3358 if (full_path
== NULL
)
3361 cifs_dbg(FYI
, "%s: full_path: %s\n", __func__
, full_path
);
3363 rc
= server
->ops
->is_path_accessible(xid
, tcon
, cifs_sb
,
3365 if (rc
!= 0 && rc
!= -EREMOTE
) {
3370 if (rc
!= -EREMOTE
) {
3371 rc
= cifs_are_all_path_components_accessible(server
, xid
, tcon
,
3372 cifs_sb
, full_path
, tcon
->Flags
& SMB_SHARE_IS_IN_DFS
);
3374 cifs_server_dbg(VFS
, "cannot query dirs between root and final path, enabling CIFS_MOUNT_USE_PREFIX_PATH\n");
3375 cifs_sb
->mnt_cifs_flags
|= CIFS_MOUNT_USE_PREFIX_PATH
;
3384 #ifdef CONFIG_CIFS_DFS_UPCALL
3385 static void set_root_ses(struct cifs_sb_info
*cifs_sb
, const uuid_t
*mount_id
, struct cifs_ses
*ses
,
3386 struct cifs_ses
**root_ses
)
3389 spin_lock(&cifs_tcp_ses_lock
);
3391 spin_unlock(&cifs_tcp_ses_lock
);
3392 dfs_cache_add_refsrv_session(mount_id
, ses
);
3397 /* Set up next dfs prefix path in @dfs_path */
3398 static int next_dfs_prepath(struct cifs_sb_info
*cifs_sb
, struct smb3_fs_context
*ctx
,
3399 const unsigned int xid
, struct TCP_Server_Info
*server
,
3400 struct cifs_tcon
*tcon
, char **dfs_path
)
3403 int added_treename
= is_tcon_dfs(tcon
);
3406 path
= cifs_build_path_to_root(ctx
, cifs_sb
, tcon
, added_treename
);
3410 rc
= is_path_remote(cifs_sb
, ctx
, xid
, server
, tcon
);
3411 if (rc
== -EREMOTE
) {
3412 struct smb3_fs_context v
= {NULL
};
3413 /* if @path contains a tree name, skip it in the prefix path */
3414 if (added_treename
) {
3415 rc
= smb3_parse_devname(path
, &v
);
3418 npath
= build_unc_path_to_root(&v
, cifs_sb
, true);
3419 smb3_cleanup_fs_context_contents(&v
);
3422 v
.prepath
= path
+ 1;
3423 npath
= build_unc_path_to_root(&v
, cifs_sb
, true);
3426 if (IS_ERR(npath
)) {
3427 rc
= PTR_ERR(npath
);
3441 /* Check if resolved targets can handle any DFS referrals */
3442 static int is_referral_server(const char *ref_path
, struct cifs_sb_info
*cifs_sb
,
3443 struct cifs_tcon
*tcon
, bool *ref_server
)
3446 struct dfs_info3_param ref
= {0};
3448 cifs_dbg(FYI
, "%s: ref_path=%s\n", __func__
, ref_path
);
3450 if (is_tcon_dfs(tcon
)) {
3455 npath
= dfs_cache_canonical_path(ref_path
, cifs_sb
->local_nls
, cifs_remap(cifs_sb
));
3457 return PTR_ERR(npath
);
3459 rc
= dfs_cache_noreq_find(npath
, &ref
, NULL
);
3462 cifs_dbg(VFS
, "%s: dfs_cache_noreq_find: failed (rc=%d)\n", __func__
, rc
);
3465 cifs_dbg(FYI
, "%s: ref.flags=0x%x\n", __func__
, ref
.flags
);
3467 * Check if all targets are capable of handling DFS referrals as per
3468 * MS-DFSC 2.2.4 RESP_GET_DFS_REFERRAL.
3470 *ref_server
= !!(ref
.flags
& DFSREF_REFERRAL_SERVER
);
3471 free_dfs_info_param(&ref
);
3476 int cifs_mount(struct cifs_sb_info
*cifs_sb
, struct smb3_fs_context
*ctx
)
3480 struct TCP_Server_Info
*server
= NULL
;
3481 struct cifs_ses
*ses
= NULL
, *root_ses
= NULL
;
3482 struct cifs_tcon
*tcon
= NULL
;
3484 uuid_t mount_id
= {0};
3485 char *ref_path
= NULL
, *full_path
= NULL
;
3486 char *oldmnt
= NULL
;
3487 bool ref_server
= false;
3489 rc
= mount_get_conns(ctx
, cifs_sb
, &xid
, &server
, &ses
, &tcon
);
3491 * If called with 'nodfs' mount option, then skip DFS resolving. Otherwise unconditionally
3492 * try to get an DFS referral (even cached) to determine whether it is an DFS mount.
3494 * Skip prefix path to provide support for DFS referrals from w2k8 servers which don't seem
3495 * to respond with PATH_NOT_COVERED to requests that include the prefix.
3497 if ((cifs_sb
->mnt_cifs_flags
& CIFS_MOUNT_NO_DFS
) ||
3498 dfs_cache_find(xid
, ses
, cifs_sb
->local_nls
, cifs_remap(cifs_sb
), ctx
->UNC
+ 1, NULL
,
3502 /* Check if it is fully accessible and then mount it */
3503 rc
= is_path_remote(cifs_sb
, ctx
, xid
, server
, tcon
);
3510 mount_put_conns(cifs_sb
, xid
, server
, ses
, tcon
);
3512 * Ignore error check here because we may failover to other targets from cached a
3515 (void)mount_get_dfs_conns(ctx
, cifs_sb
, &xid
, &server
, &ses
, &tcon
);
3517 /* Get path of DFS root */
3518 ref_path
= build_unc_path_to_root(ctx
, cifs_sb
, false);
3519 if (IS_ERR(ref_path
)) {
3520 rc
= PTR_ERR(ref_path
);
3525 uuid_gen(&mount_id
);
3526 set_root_ses(cifs_sb
, &mount_id
, ses
, &root_ses
);
3528 /* Save full path of last DFS path we used to resolve final target server */
3530 full_path
= build_unc_path_to_root(ctx
, cifs_sb
, !!count
);
3531 if (IS_ERR(full_path
)) {
3532 rc
= PTR_ERR(full_path
);
3536 /* Chase referral */
3537 oldmnt
= cifs_sb
->ctx
->mount_options
;
3538 rc
= expand_dfs_referral(xid
, root_ses
, ctx
, cifs_sb
, ref_path
+ 1);
3541 /* Connect to new DFS target only if we were redirected */
3542 if (oldmnt
!= cifs_sb
->ctx
->mount_options
) {
3543 mount_put_conns(cifs_sb
, xid
, server
, ses
, tcon
);
3544 rc
= mount_get_dfs_conns(ctx
, cifs_sb
, &xid
, &server
, &ses
, &tcon
);
3546 if (rc
&& !server
&& !ses
) {
3547 /* Failed to connect. Try to connect to other targets in the referral. */
3548 rc
= do_dfs_failover(ref_path
+ 1, full_path
, cifs_sb
, ctx
, root_ses
, &xid
,
3549 &server
, &ses
, &tcon
);
3551 if (rc
== -EACCES
|| rc
== -EOPNOTSUPP
|| !server
|| !ses
)
3556 /* Make sure that requests go through new root servers */
3557 rc
= is_referral_server(ref_path
+ 1, cifs_sb
, tcon
, &ref_server
);
3561 set_root_ses(cifs_sb
, &mount_id
, ses
, &root_ses
);
3563 /* Get next dfs path and then continue chasing them if -EREMOTE */
3564 rc
= next_dfs_prepath(cifs_sb
, ctx
, xid
, server
, tcon
, &ref_path
);
3565 /* Prevent recursion on broken link referrals */
3566 if (rc
== -EREMOTE
&& ++count
> MAX_NESTED_LINKS
)
3568 } while (rc
== -EREMOTE
);
3570 if (rc
|| !tcon
|| !ses
)
3575 * Store DFS full path in both superblock and tree connect structures.
3577 * For DFS root mounts, the prefix path (cifs_sb->prepath) is preserved during reconnect so
3578 * only the root path is set in cifs_sb->origin_fullpath and tcon->dfs_path. And for DFS
3579 * links, the prefix path is included in both and may be changed during reconnect. See
3580 * cifs_tree_connect().
3582 ref_path
= dfs_cache_canonical_path(full_path
, cifs_sb
->local_nls
, cifs_remap(cifs_sb
));
3586 if (IS_ERR(ref_path
)) {
3587 rc
= PTR_ERR(ref_path
);
3591 cifs_sb
->origin_fullpath
= ref_path
;
3593 ref_path
= kstrdup(cifs_sb
->origin_fullpath
, GFP_KERNEL
);
3598 spin_lock(&cifs_tcp_ses_lock
);
3599 tcon
->dfs_path
= ref_path
;
3601 spin_unlock(&cifs_tcp_ses_lock
);
3604 * After reconnecting to a different server, unique ids won't
3605 * match anymore, so we disable serverino. This prevents
3606 * dentry revalidation to think the dentry are stale (ESTALE).
3608 cifs_autodisable_serverino(cifs_sb
);
3610 * Force the use of prefix path to support failover on DFS paths that
3611 * resolve to targets that have different prefix paths.
3613 cifs_sb
->mnt_cifs_flags
|= CIFS_MOUNT_USE_PREFIX_PATH
;
3614 kfree(cifs_sb
->prepath
);
3615 cifs_sb
->prepath
= ctx
->prepath
;
3616 ctx
->prepath
= NULL
;
3617 uuid_copy(&cifs_sb
->dfs_mount_id
, &mount_id
);
3621 cifs_try_adding_channels(cifs_sb
, ses
);
3622 return mount_setup_tlink(cifs_sb
, ses
, tcon
);
3627 kfree(cifs_sb
->origin_fullpath
);
3628 dfs_cache_put_refsrv_sessions(&mount_id
);
3629 mount_put_conns(cifs_sb
, xid
, server
, ses
, tcon
);
3633 int cifs_mount(struct cifs_sb_info
*cifs_sb
, struct smb3_fs_context
*ctx
)
3637 struct cifs_ses
*ses
;
3638 struct cifs_tcon
*tcon
;
3639 struct TCP_Server_Info
*server
;
3641 rc
= mount_get_conns(ctx
, cifs_sb
, &xid
, &server
, &ses
, &tcon
);
3646 rc
= is_path_remote(cifs_sb
, ctx
, xid
, server
, tcon
);
3655 return mount_setup_tlink(cifs_sb
, ses
, tcon
);
3658 mount_put_conns(cifs_sb
, xid
, server
, ses
, tcon
);
3664 * Issue a TREE_CONNECT request.
3667 CIFSTCon(const unsigned int xid
, struct cifs_ses
*ses
,
3668 const char *tree
, struct cifs_tcon
*tcon
,
3669 const struct nls_table
*nls_codepage
)
3671 struct smb_hdr
*smb_buffer
;
3672 struct smb_hdr
*smb_buffer_response
;
3675 unsigned char *bcc_ptr
;
3678 __u16 bytes_left
, count
;
3683 smb_buffer
= cifs_buf_get();
3684 if (smb_buffer
== NULL
)
3687 smb_buffer_response
= smb_buffer
;
3689 header_assemble(smb_buffer
, SMB_COM_TREE_CONNECT_ANDX
,
3690 NULL
/*no tid */ , 4 /*wct */ );
3692 smb_buffer
->Mid
= get_next_mid(ses
->server
);
3693 smb_buffer
->Uid
= ses
->Suid
;
3694 pSMB
= (TCONX_REQ
*) smb_buffer
;
3695 pSMBr
= (TCONX_RSP
*) smb_buffer_response
;
3697 pSMB
->AndXCommand
= 0xFF;
3698 pSMB
->Flags
= cpu_to_le16(TCON_EXTENDED_SECINFO
);
3699 bcc_ptr
= &pSMB
->Password
[0];
3700 if (tcon
->pipe
|| (ses
->server
->sec_mode
& SECMODE_USER
)) {
3701 pSMB
->PasswordLength
= cpu_to_le16(1); /* minimum */
3702 *bcc_ptr
= 0; /* password is null byte */
3703 bcc_ptr
++; /* skip password */
3704 /* already aligned so no need to do it below */
3707 if (ses
->server
->sign
)
3708 smb_buffer
->Flags2
|= SMBFLG2_SECURITY_SIGNATURE
;
3710 if (ses
->capabilities
& CAP_STATUS32
) {
3711 smb_buffer
->Flags2
|= SMBFLG2_ERR_STATUS
;
3713 if (ses
->capabilities
& CAP_DFS
) {
3714 smb_buffer
->Flags2
|= SMBFLG2_DFS
;
3716 if (ses
->capabilities
& CAP_UNICODE
) {
3717 smb_buffer
->Flags2
|= SMBFLG2_UNICODE
;
3719 cifs_strtoUTF16((__le16
*) bcc_ptr
, tree
,
3720 6 /* max utf8 char length in bytes */ *
3721 (/* server len*/ + 256 /* share len */), nls_codepage
);
3722 bcc_ptr
+= 2 * length
; /* convert num 16 bit words to bytes */
3723 bcc_ptr
+= 2; /* skip trailing null */
3724 } else { /* ASCII */
3725 strcpy(bcc_ptr
, tree
);
3726 bcc_ptr
+= strlen(tree
) + 1;
3728 strcpy(bcc_ptr
, "?????");
3729 bcc_ptr
+= strlen("?????");
3731 count
= bcc_ptr
- &pSMB
->Password
[0];
3732 be32_add_cpu(&pSMB
->hdr
.smb_buf_length
, count
);
3733 pSMB
->ByteCount
= cpu_to_le16(count
);
3735 rc
= SendReceive(xid
, ses
, smb_buffer
, smb_buffer_response
, &length
,
3738 /* above now done in SendReceive */
3742 tcon
->tidStatus
= CifsGood
;
3743 tcon
->need_reconnect
= false;
3744 tcon
->tid
= smb_buffer_response
->Tid
;
3745 bcc_ptr
= pByteArea(smb_buffer_response
);
3746 bytes_left
= get_bcc(smb_buffer_response
);
3747 length
= strnlen(bcc_ptr
, bytes_left
- 2);
3748 if (smb_buffer
->Flags2
& SMBFLG2_UNICODE
)
3754 /* skip service field (NB: this field is always ASCII) */
3756 if ((bcc_ptr
[0] == 'I') && (bcc_ptr
[1] == 'P') &&
3757 (bcc_ptr
[2] == 'C')) {
3758 cifs_dbg(FYI
, "IPC connection\n");
3762 } else if (length
== 2) {
3763 if ((bcc_ptr
[0] == 'A') && (bcc_ptr
[1] == ':')) {
3764 /* the most common case */
3765 cifs_dbg(FYI
, "disk share connection\n");
3768 bcc_ptr
+= length
+ 1;
3769 bytes_left
-= (length
+ 1);
3770 strlcpy(tcon
->treeName
, tree
, sizeof(tcon
->treeName
));
3772 /* mostly informational -- no need to fail on error here */
3773 kfree(tcon
->nativeFileSystem
);
3774 tcon
->nativeFileSystem
= cifs_strndup_from_utf16(bcc_ptr
,
3775 bytes_left
, is_unicode
,
3778 cifs_dbg(FYI
, "nativeFileSystem=%s\n", tcon
->nativeFileSystem
);
3780 if ((smb_buffer_response
->WordCount
== 3) ||
3781 (smb_buffer_response
->WordCount
== 7))
3782 /* field is in same location */
3783 tcon
->Flags
= le16_to_cpu(pSMBr
->OptionalSupport
);
3786 cifs_dbg(FYI
, "Tcon flags: 0x%x\n", tcon
->Flags
);
3789 cifs_buf_release(smb_buffer
);
3793 static void delayed_free(struct rcu_head
*p
)
3795 struct cifs_sb_info
*cifs_sb
= container_of(p
, struct cifs_sb_info
, rcu
);
3797 unload_nls(cifs_sb
->local_nls
);
3798 smb3_cleanup_fs_context(cifs_sb
->ctx
);
3803 cifs_umount(struct cifs_sb_info
*cifs_sb
)
3805 struct rb_root
*root
= &cifs_sb
->tlink_tree
;
3806 struct rb_node
*node
;
3807 struct tcon_link
*tlink
;
3809 cancel_delayed_work_sync(&cifs_sb
->prune_tlinks
);
3811 spin_lock(&cifs_sb
->tlink_tree_lock
);
3812 while ((node
= rb_first(root
))) {
3813 tlink
= rb_entry(node
, struct tcon_link
, tl_rbnode
);
3814 cifs_get_tlink(tlink
);
3815 clear_bit(TCON_LINK_IN_TREE
, &tlink
->tl_flags
);
3816 rb_erase(node
, root
);
3818 spin_unlock(&cifs_sb
->tlink_tree_lock
);
3819 cifs_put_tlink(tlink
);
3820 spin_lock(&cifs_sb
->tlink_tree_lock
);
3822 spin_unlock(&cifs_sb
->tlink_tree_lock
);
3824 kfree(cifs_sb
->prepath
);
3825 #ifdef CONFIG_CIFS_DFS_UPCALL
3826 dfs_cache_put_refsrv_sessions(&cifs_sb
->dfs_mount_id
);
3827 kfree(cifs_sb
->origin_fullpath
);
3829 call_rcu(&cifs_sb
->rcu
, delayed_free
);
3833 cifs_negotiate_protocol(const unsigned int xid
, struct cifs_ses
*ses
)
3836 struct TCP_Server_Info
*server
= cifs_ses_server(ses
);
3838 if (!server
->ops
->need_neg
|| !server
->ops
->negotiate
)
3841 /* only send once per connect */
3842 if (!server
->ops
->need_neg(server
))
3845 rc
= server
->ops
->negotiate(xid
, ses
);
3847 spin_lock(&GlobalMid_Lock
);
3848 if (server
->tcpStatus
== CifsNeedNegotiate
)
3849 server
->tcpStatus
= CifsGood
;
3852 spin_unlock(&GlobalMid_Lock
);
3859 cifs_setup_session(const unsigned int xid
, struct cifs_ses
*ses
,
3860 struct nls_table
*nls_info
)
3863 struct TCP_Server_Info
*server
= cifs_ses_server(ses
);
3865 if (!ses
->binding
) {
3866 ses
->capabilities
= server
->capabilities
;
3867 if (!linuxExtEnabled
)
3868 ses
->capabilities
&= (~server
->vals
->cap_unix
);
3870 if (ses
->auth_key
.response
) {
3871 cifs_dbg(FYI
, "Free previous auth_key.response = %p\n",
3872 ses
->auth_key
.response
);
3873 kfree(ses
->auth_key
.response
);
3874 ses
->auth_key
.response
= NULL
;
3875 ses
->auth_key
.len
= 0;
3879 cifs_dbg(FYI
, "Security Mode: 0x%x Capabilities: 0x%x TimeAdjust: %d\n",
3880 server
->sec_mode
, server
->capabilities
, server
->timeAdj
);
3882 if (server
->ops
->sess_setup
)
3883 rc
= server
->ops
->sess_setup(xid
, ses
, nls_info
);
3886 cifs_server_dbg(VFS
, "Send error in SessSetup = %d\n", rc
);
3892 cifs_set_vol_auth(struct smb3_fs_context
*ctx
, struct cifs_ses
*ses
)
3894 ctx
->sectype
= ses
->sectype
;
3896 /* krb5 is special, since we don't need username or pw */
3897 if (ctx
->sectype
== Kerberos
)
3900 return cifs_set_cifscreds(ctx
, ses
);
3903 static struct cifs_tcon
*
3904 cifs_construct_tcon(struct cifs_sb_info
*cifs_sb
, kuid_t fsuid
)
3907 struct cifs_tcon
*master_tcon
= cifs_sb_master_tcon(cifs_sb
);
3908 struct cifs_ses
*ses
;
3909 struct cifs_tcon
*tcon
= NULL
;
3910 struct smb3_fs_context
*ctx
;
3912 ctx
= kzalloc(sizeof(*ctx
), GFP_KERNEL
);
3914 return ERR_PTR(-ENOMEM
);
3916 ctx
->local_nls
= cifs_sb
->local_nls
;
3917 ctx
->linux_uid
= fsuid
;
3918 ctx
->cred_uid
= fsuid
;
3919 ctx
->UNC
= master_tcon
->treeName
;
3920 ctx
->retry
= master_tcon
->retry
;
3921 ctx
->nocase
= master_tcon
->nocase
;
3922 ctx
->nohandlecache
= master_tcon
->nohandlecache
;
3923 ctx
->local_lease
= master_tcon
->local_lease
;
3924 ctx
->no_lease
= master_tcon
->no_lease
;
3925 ctx
->resilient
= master_tcon
->use_resilient
;
3926 ctx
->persistent
= master_tcon
->use_persistent
;
3927 ctx
->handle_timeout
= master_tcon
->handle_timeout
;
3928 ctx
->no_linux_ext
= !master_tcon
->unix_ext
;
3929 ctx
->linux_ext
= master_tcon
->posix_extensions
;
3930 ctx
->sectype
= master_tcon
->ses
->sectype
;
3931 ctx
->sign
= master_tcon
->ses
->sign
;
3932 ctx
->seal
= master_tcon
->seal
;
3933 ctx
->witness
= master_tcon
->use_witness
;
3935 rc
= cifs_set_vol_auth(ctx
, master_tcon
->ses
);
3941 /* get a reference for the same TCP session */
3942 spin_lock(&cifs_tcp_ses_lock
);
3943 ++master_tcon
->ses
->server
->srv_count
;
3944 spin_unlock(&cifs_tcp_ses_lock
);
3946 ses
= cifs_get_smb_ses(master_tcon
->ses
->server
, ctx
);
3948 tcon
= (struct cifs_tcon
*)ses
;
3949 cifs_put_tcp_session(master_tcon
->ses
->server
, 0);
3953 tcon
= cifs_get_tcon(ses
, ctx
);
3955 cifs_put_smb_ses(ses
);
3960 reset_cifs_unix_caps(0, tcon
, NULL
, ctx
);
3963 kfree(ctx
->username
);
3964 kfree_sensitive(ctx
->password
);
3971 cifs_sb_master_tcon(struct cifs_sb_info
*cifs_sb
)
3973 return tlink_tcon(cifs_sb_master_tlink(cifs_sb
));
3976 /* find and return a tlink with given uid */
3977 static struct tcon_link
*
3978 tlink_rb_search(struct rb_root
*root
, kuid_t uid
)
3980 struct rb_node
*node
= root
->rb_node
;
3981 struct tcon_link
*tlink
;
3984 tlink
= rb_entry(node
, struct tcon_link
, tl_rbnode
);
3986 if (uid_gt(tlink
->tl_uid
, uid
))
3987 node
= node
->rb_left
;
3988 else if (uid_lt(tlink
->tl_uid
, uid
))
3989 node
= node
->rb_right
;
3996 /* insert a tcon_link into the tree */
3998 tlink_rb_insert(struct rb_root
*root
, struct tcon_link
*new_tlink
)
4000 struct rb_node
**new = &(root
->rb_node
), *parent
= NULL
;
4001 struct tcon_link
*tlink
;
4004 tlink
= rb_entry(*new, struct tcon_link
, tl_rbnode
);
4007 if (uid_gt(tlink
->tl_uid
, new_tlink
->tl_uid
))
4008 new = &((*new)->rb_left
);
4010 new = &((*new)->rb_right
);
4013 rb_link_node(&new_tlink
->tl_rbnode
, parent
, new);
4014 rb_insert_color(&new_tlink
->tl_rbnode
, root
);
4018 * Find or construct an appropriate tcon given a cifs_sb and the fsuid of the
4021 * If the superblock doesn't refer to a multiuser mount, then just return
4022 * the master tcon for the mount.
4024 * First, search the rbtree for an existing tcon for this fsuid. If one
4025 * exists, then check to see if it's pending construction. If it is then wait
4026 * for construction to complete. Once it's no longer pending, check to see if
4027 * it failed and either return an error or retry construction, depending on
4030 * If one doesn't exist then insert a new tcon_link struct into the tree and
4031 * try to construct a new one.
4034 cifs_sb_tlink(struct cifs_sb_info
*cifs_sb
)
4037 kuid_t fsuid
= current_fsuid();
4038 struct tcon_link
*tlink
, *newtlink
;
4040 if (!(cifs_sb
->mnt_cifs_flags
& CIFS_MOUNT_MULTIUSER
))
4041 return cifs_get_tlink(cifs_sb_master_tlink(cifs_sb
));
4043 spin_lock(&cifs_sb
->tlink_tree_lock
);
4044 tlink
= tlink_rb_search(&cifs_sb
->tlink_tree
, fsuid
);
4046 cifs_get_tlink(tlink
);
4047 spin_unlock(&cifs_sb
->tlink_tree_lock
);
4049 if (tlink
== NULL
) {
4050 newtlink
= kzalloc(sizeof(*tlink
), GFP_KERNEL
);
4051 if (newtlink
== NULL
)
4052 return ERR_PTR(-ENOMEM
);
4053 newtlink
->tl_uid
= fsuid
;
4054 newtlink
->tl_tcon
= ERR_PTR(-EACCES
);
4055 set_bit(TCON_LINK_PENDING
, &newtlink
->tl_flags
);
4056 set_bit(TCON_LINK_IN_TREE
, &newtlink
->tl_flags
);
4057 cifs_get_tlink(newtlink
);
4059 spin_lock(&cifs_sb
->tlink_tree_lock
);
4060 /* was one inserted after previous search? */
4061 tlink
= tlink_rb_search(&cifs_sb
->tlink_tree
, fsuid
);
4063 cifs_get_tlink(tlink
);
4064 spin_unlock(&cifs_sb
->tlink_tree_lock
);
4066 goto wait_for_construction
;
4069 tlink_rb_insert(&cifs_sb
->tlink_tree
, tlink
);
4070 spin_unlock(&cifs_sb
->tlink_tree_lock
);
4072 wait_for_construction
:
4073 ret
= wait_on_bit(&tlink
->tl_flags
, TCON_LINK_PENDING
,
4074 TASK_INTERRUPTIBLE
);
4076 cifs_put_tlink(tlink
);
4077 return ERR_PTR(-ERESTARTSYS
);
4080 /* if it's good, return it */
4081 if (!IS_ERR(tlink
->tl_tcon
))
4084 /* return error if we tried this already recently */
4085 if (time_before(jiffies
, tlink
->tl_time
+ TLINK_ERROR_EXPIRE
)) {
4086 cifs_put_tlink(tlink
);
4087 return ERR_PTR(-EACCES
);
4090 if (test_and_set_bit(TCON_LINK_PENDING
, &tlink
->tl_flags
))
4091 goto wait_for_construction
;
4094 tlink
->tl_tcon
= cifs_construct_tcon(cifs_sb
, fsuid
);
4095 clear_bit(TCON_LINK_PENDING
, &tlink
->tl_flags
);
4096 wake_up_bit(&tlink
->tl_flags
, TCON_LINK_PENDING
);
4098 if (IS_ERR(tlink
->tl_tcon
)) {
4099 cifs_put_tlink(tlink
);
4100 return ERR_PTR(-EACCES
);
4107 * periodic workqueue job that scans tcon_tree for a superblock and closes
4111 cifs_prune_tlinks(struct work_struct
*work
)
4113 struct cifs_sb_info
*cifs_sb
= container_of(work
, struct cifs_sb_info
,
4115 struct rb_root
*root
= &cifs_sb
->tlink_tree
;
4116 struct rb_node
*node
;
4117 struct rb_node
*tmp
;
4118 struct tcon_link
*tlink
;
4121 * Because we drop the spinlock in the loop in order to put the tlink
4122 * it's not guarded against removal of links from the tree. The only
4123 * places that remove entries from the tree are this function and
4124 * umounts. Because this function is non-reentrant and is canceled
4125 * before umount can proceed, this is safe.
4127 spin_lock(&cifs_sb
->tlink_tree_lock
);
4128 node
= rb_first(root
);
4129 while (node
!= NULL
) {
4131 node
= rb_next(tmp
);
4132 tlink
= rb_entry(tmp
, struct tcon_link
, tl_rbnode
);
4134 if (test_bit(TCON_LINK_MASTER
, &tlink
->tl_flags
) ||
4135 atomic_read(&tlink
->tl_count
) != 0 ||
4136 time_after(tlink
->tl_time
+ TLINK_IDLE_EXPIRE
, jiffies
))
4139 cifs_get_tlink(tlink
);
4140 clear_bit(TCON_LINK_IN_TREE
, &tlink
->tl_flags
);
4141 rb_erase(tmp
, root
);
4143 spin_unlock(&cifs_sb
->tlink_tree_lock
);
4144 cifs_put_tlink(tlink
);
4145 spin_lock(&cifs_sb
->tlink_tree_lock
);
4147 spin_unlock(&cifs_sb
->tlink_tree_lock
);
4149 queue_delayed_work(cifsiod_wq
, &cifs_sb
->prune_tlinks
,
4153 #ifdef CONFIG_CIFS_DFS_UPCALL
4154 int cifs_tree_connect(const unsigned int xid
, struct cifs_tcon
*tcon
, const struct nls_table
*nlsc
)
4157 struct TCP_Server_Info
*server
= tcon
->ses
->server
;
4158 const struct smb_version_operations
*ops
= server
->ops
;
4159 struct dfs_cache_tgt_list tl
;
4160 struct dfs_cache_tgt_iterator
*it
= NULL
;
4162 const char *tcp_host
;
4163 size_t tcp_host_len
;
4164 const char *dfs_host
;
4165 size_t dfs_host_len
;
4166 char *share
= NULL
, *prefix
= NULL
;
4167 struct dfs_info3_param ref
= {0};
4170 tree
= kzalloc(MAX_TREE_SIZE
, GFP_KERNEL
);
4174 /* If it is not dfs or there was no cached dfs referral, then reconnect to same share */
4175 if (!tcon
->dfs_path
|| dfs_cache_noreq_find(tcon
->dfs_path
+ 1, &ref
, &tl
)) {
4177 scnprintf(tree
, MAX_TREE_SIZE
, "\\\\%s\\IPC$", server
->hostname
);
4178 rc
= ops
->tree_connect(xid
, tcon
->ses
, tree
, tcon
, nlsc
);
4180 rc
= ops
->tree_connect(xid
, tcon
->ses
, tcon
->treeName
, tcon
, nlsc
);
4185 isroot
= ref
.server_type
== DFS_TYPE_ROOT
;
4186 free_dfs_info_param(&ref
);
4188 extract_unc_hostname(server
->hostname
, &tcp_host
, &tcp_host_len
);
4190 for (it
= dfs_cache_get_tgt_iterator(&tl
); it
; it
= dfs_cache_get_next_tgt(&tl
, it
)) {
4198 rc
= dfs_cache_get_tgt_share(tcon
->dfs_path
+ 1, it
, &share
, &prefix
);
4200 cifs_dbg(VFS
, "%s: failed to parse target share %d\n",
4205 extract_unc_hostname(share
, &dfs_host
, &dfs_host_len
);
4207 if (dfs_host_len
!= tcp_host_len
4208 || strncasecmp(dfs_host
, tcp_host
, dfs_host_len
) != 0) {
4209 cifs_dbg(FYI
, "%s: %.*s doesn't match %.*s\n", __func__
, (int)dfs_host_len
,
4210 dfs_host
, (int)tcp_host_len
, tcp_host
);
4212 rc
= match_target_ip(server
, dfs_host
, dfs_host_len
, &target_match
);
4214 cifs_dbg(VFS
, "%s: failed to match target ip: %d\n", __func__
, rc
);
4218 if (!target_match
) {
4219 cifs_dbg(FYI
, "%s: skipping target\n", __func__
);
4225 scnprintf(tree
, MAX_TREE_SIZE
, "\\\\%s\\IPC$", share
);
4226 rc
= ops
->tree_connect(xid
, tcon
->ses
, tree
, tcon
, nlsc
);
4228 scnprintf(tree
, MAX_TREE_SIZE
, "\\%s", share
);
4229 rc
= ops
->tree_connect(xid
, tcon
->ses
, tree
, tcon
, nlsc
);
4230 /* Only handle prefix paths of DFS link targets */
4231 if (!rc
&& !isroot
) {
4232 rc
= update_super_prepath(tcon
, prefix
);
4245 rc
= dfs_cache_noreq_update_tgthint(tcon
->dfs_path
+ 1, it
);
4249 dfs_cache_free_tgts(&tl
);
4255 int cifs_tree_connect(const unsigned int xid
, struct cifs_tcon
*tcon
, const struct nls_table
*nlsc
)
4257 const struct smb_version_operations
*ops
= tcon
->ses
->server
->ops
;
4259 return ops
->tree_connect(xid
, tcon
->ses
, tcon
->treeName
, tcon
, nlsc
);