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
65 struct cifs_sb_info *cifs_sb;
66 struct smb3_fs_context *fs_ctx;
68 struct TCP_Server_Info *server;
70 struct cifs_tcon *tcon;
71 #ifdef CONFIG_CIFS_DFS_UPCALL
72 struct cifs_ses *root_ses;
74 char *origin_fullpath, *leaf_fullpath;
78 static int ip_connect(struct TCP_Server_Info *server);
79 static int generic_ip_connect(struct TCP_Server_Info *server);
80 static void tlink_rb_insert(struct rb_root *root, struct tcon_link *new_tlink);
81 static void cifs_prune_tlinks(struct work_struct *work);
84 * Resolve hostname and set ip addr in tcp ses. Useful for hostnames that may
85 * get their ip addresses changed at some point.
87 * This should be called with server->srv_mutex held.
89 static int reconn_set_ipaddr_from_hostname(struct TCP_Server_Info *server)
93 char *unc, *ipaddr = NULL;
95 unsigned long ttl = SMB_DNS_RESOLVE_INTERVAL_DEFAULT;
97 if (!server->hostname)
100 /* if server hostname isn't populated, there's nothing to do here */
101 if (server->hostname[0] == '\0')
104 len = strlen(server->hostname) + 3;
106 unc = kmalloc(len, GFP_KERNEL);
108 cifs_dbg(FYI, "%s: failed to create UNC path\n", __func__);
111 scnprintf(unc, len, "\\\\%s", server->hostname);
113 rc = dns_resolve_server_name_to_ip(unc, &ipaddr, &expiry);
117 cifs_dbg(FYI, "%s: failed to resolve server part of %s to IP: %d\n",
118 __func__, server->hostname, rc);
119 goto requeue_resolve;
122 spin_lock(&cifs_tcp_ses_lock);
123 rc = cifs_convert_address((struct sockaddr *)&server->dstaddr, ipaddr,
125 spin_unlock(&cifs_tcp_ses_lock);
128 /* rc == 1 means success here */
130 now = ktime_get_real_seconds();
131 if (expiry && expiry > now)
133 * To make sure we don't use the cached entry, retry 1s
136 ttl = max_t(unsigned long, expiry - now, SMB_DNS_RESOLVE_INTERVAL_MIN) + 1;
141 cifs_dbg(FYI, "%s: next dns resolution scheduled for %lu seconds in the future\n",
143 mod_delayed_work(cifsiod_wq, &server->resolve, (ttl * HZ));
148 static void smb2_query_server_interfaces(struct work_struct *work)
151 struct cifs_tcon *tcon = container_of(work,
153 query_interfaces.work);
156 * query server network interfaces, in case they change
158 rc = SMB3_request_interfaces(0, tcon);
160 cifs_dbg(FYI, "%s: failed to query server interfaces: %d\n",
164 queue_delayed_work(cifsiod_wq, &tcon->query_interfaces,
165 (SMB_INTERFACE_POLL_INTERVAL * HZ));
168 static void cifs_resolve_server(struct work_struct *work)
171 struct TCP_Server_Info *server = container_of(work,
172 struct TCP_Server_Info, resolve.work);
174 cifs_server_lock(server);
177 * Resolve the hostname again to make sure that IP address is up-to-date.
179 rc = reconn_set_ipaddr_from_hostname(server);
181 cifs_dbg(FYI, "%s: failed to resolve hostname: %d\n",
185 cifs_server_unlock(server);
189 * Update the tcpStatus for the server.
190 * This is used to signal the cifsd thread to call cifs_reconnect
191 * ONLY cifsd thread should call cifs_reconnect. For any other
192 * thread, use this function
194 * @server: the tcp ses for which reconnect is needed
195 * @all_channels: if this needs to be done for all channels
198 cifs_signal_cifsd_for_reconnect(struct TCP_Server_Info *server,
201 struct TCP_Server_Info *pserver;
202 struct cifs_ses *ses;
205 /* If server is a channel, select the primary channel */
206 pserver = CIFS_SERVER_IS_CHAN(server) ? server->primary_server : server;
208 spin_lock(&cifs_tcp_ses_lock);
210 pserver->tcpStatus = CifsNeedReconnect;
211 spin_unlock(&cifs_tcp_ses_lock);
215 list_for_each_entry(ses, &pserver->smb_ses_list, smb_ses_list) {
216 spin_lock(&ses->chan_lock);
217 for (i = 0; i < ses->chan_count; i++)
218 ses->chans[i].server->tcpStatus = CifsNeedReconnect;
219 spin_unlock(&ses->chan_lock);
221 spin_unlock(&cifs_tcp_ses_lock);
225 * Mark all sessions and tcons for reconnect.
226 * IMPORTANT: make sure that this gets called only from
227 * cifsd thread. For any other thread, use
228 * cifs_signal_cifsd_for_reconnect
230 * @server: the tcp ses for which reconnect is needed
231 * @server needs to be previously set to CifsNeedReconnect.
232 * @mark_smb_session: whether even sessions need to be marked
235 cifs_mark_tcp_ses_conns_for_reconnect(struct TCP_Server_Info *server,
236 bool mark_smb_session)
238 struct TCP_Server_Info *pserver;
239 struct cifs_ses *ses, *nses;
240 struct cifs_tcon *tcon;
243 * before reconnecting the tcp session, mark the smb session (uid) and the tid bad so they
244 * are not used until reconnected.
246 cifs_dbg(FYI, "%s: marking necessary sessions and tcons for reconnect\n", __func__);
248 /* If server is a channel, select the primary channel */
249 pserver = CIFS_SERVER_IS_CHAN(server) ? server->primary_server : server;
252 spin_lock(&cifs_tcp_ses_lock);
253 list_for_each_entry_safe(ses, nses, &pserver->smb_ses_list, smb_ses_list) {
254 /* check if iface is still active */
255 if (!cifs_chan_is_iface_active(ses, server)) {
257 * HACK: drop the lock before calling
258 * cifs_chan_update_iface to avoid deadlock
261 spin_unlock(&cifs_tcp_ses_lock);
262 cifs_chan_update_iface(ses, server);
263 spin_lock(&cifs_tcp_ses_lock);
267 spin_lock(&ses->chan_lock);
268 if (!mark_smb_session && cifs_chan_needs_reconnect(ses, server))
271 if (mark_smb_session)
272 CIFS_SET_ALL_CHANS_NEED_RECONNECT(ses);
274 cifs_chan_set_need_reconnect(ses, server);
276 /* If all channels need reconnect, then tcon needs reconnect */
277 if (!mark_smb_session && !CIFS_ALL_CHANS_NEED_RECONNECT(ses))
280 ses->ses_status = SES_NEED_RECON;
282 list_for_each_entry(tcon, &ses->tcon_list, tcon_list) {
283 tcon->need_reconnect = true;
284 tcon->status = TID_NEED_RECON;
287 ses->tcon_ipc->need_reconnect = true;
290 spin_unlock(&ses->chan_lock);
292 spin_unlock(&cifs_tcp_ses_lock);
296 cifs_abort_connection(struct TCP_Server_Info *server)
298 struct mid_q_entry *mid, *nmid;
299 struct list_head retry_list;
302 server->max_read = 0;
304 /* do not want to be sending data on a socket we are freeing */
305 cifs_dbg(FYI, "%s: tearing down socket\n", __func__);
306 cifs_server_lock(server);
307 if (server->ssocket) {
308 cifs_dbg(FYI, "State: 0x%x Flags: 0x%lx\n", server->ssocket->state,
309 server->ssocket->flags);
310 kernel_sock_shutdown(server->ssocket, SHUT_WR);
311 cifs_dbg(FYI, "Post shutdown state: 0x%x Flags: 0x%lx\n", server->ssocket->state,
312 server->ssocket->flags);
313 sock_release(server->ssocket);
314 server->ssocket = NULL;
316 server->sequence_number = 0;
317 server->session_estab = false;
318 kfree(server->session_key.response);
319 server->session_key.response = NULL;
320 server->session_key.len = 0;
321 server->lstrp = jiffies;
323 /* mark submitted MIDs for retry and issue callback */
324 INIT_LIST_HEAD(&retry_list);
325 cifs_dbg(FYI, "%s: moving mids to private list\n", __func__);
326 spin_lock(&GlobalMid_Lock);
327 list_for_each_entry_safe(mid, nmid, &server->pending_mid_q, qhead) {
328 kref_get(&mid->refcount);
329 if (mid->mid_state == MID_REQUEST_SUBMITTED)
330 mid->mid_state = MID_RETRY_NEEDED;
331 list_move(&mid->qhead, &retry_list);
332 mid->mid_flags |= MID_DELETED;
334 spin_unlock(&GlobalMid_Lock);
335 cifs_server_unlock(server);
337 cifs_dbg(FYI, "%s: issuing mid callbacks\n", __func__);
338 list_for_each_entry_safe(mid, nmid, &retry_list, qhead) {
339 list_del_init(&mid->qhead);
341 cifs_mid_q_entry_release(mid);
344 if (cifs_rdma_enabled(server)) {
345 cifs_server_lock(server);
346 smbd_destroy(server);
347 cifs_server_unlock(server);
351 static bool cifs_tcp_ses_needs_reconnect(struct TCP_Server_Info *server, int num_targets)
353 spin_lock(&cifs_tcp_ses_lock);
354 server->nr_targets = num_targets;
355 if (server->tcpStatus == CifsExiting) {
356 /* the demux thread will exit normally next time through the loop */
357 spin_unlock(&cifs_tcp_ses_lock);
358 wake_up(&server->response_q);
362 cifs_dbg(FYI, "Mark tcp session as need reconnect\n");
363 trace_smb3_reconnect(server->CurrentMid, server->conn_id,
365 server->tcpStatus = CifsNeedReconnect;
367 spin_unlock(&cifs_tcp_ses_lock);
372 * cifs tcp session reconnection
374 * mark tcp session as reconnecting so temporarily locked
375 * mark all smb sessions as reconnecting for tcp session
376 * reconnect tcp session
377 * wake up waiters on reconnection? - (not needed currently)
379 * if mark_smb_session is passed as true, unconditionally mark
380 * the smb session (and tcon) for reconnect as well. This value
381 * doesn't really matter for non-multichannel scenario.
384 static int __cifs_reconnect(struct TCP_Server_Info *server,
385 bool mark_smb_session)
389 if (!cifs_tcp_ses_needs_reconnect(server, 1))
392 cifs_mark_tcp_ses_conns_for_reconnect(server, mark_smb_session);
394 cifs_abort_connection(server);
398 cifs_server_lock(server);
400 if (!cifs_swn_set_server_dstaddr(server)) {
401 /* resolve the hostname again to make sure that IP address is up-to-date */
402 rc = reconn_set_ipaddr_from_hostname(server);
403 cifs_dbg(FYI, "%s: reconn_set_ipaddr_from_hostname: rc=%d\n", __func__, rc);
406 if (cifs_rdma_enabled(server))
407 rc = smbd_reconnect(server);
409 rc = generic_ip_connect(server);
411 cifs_server_unlock(server);
412 cifs_dbg(FYI, "%s: reconnect error %d\n", __func__, rc);
415 atomic_inc(&tcpSesReconnectCount);
416 set_credits(server, 1);
417 spin_lock(&cifs_tcp_ses_lock);
418 if (server->tcpStatus != CifsExiting)
419 server->tcpStatus = CifsNeedNegotiate;
420 spin_unlock(&cifs_tcp_ses_lock);
421 cifs_swn_reset_server_dstaddr(server);
422 cifs_server_unlock(server);
423 mod_delayed_work(cifsiod_wq, &server->reconnect, 0);
425 } while (server->tcpStatus == CifsNeedReconnect);
427 spin_lock(&cifs_tcp_ses_lock);
428 if (server->tcpStatus == CifsNeedNegotiate)
429 mod_delayed_work(cifsiod_wq, &server->echo, 0);
430 spin_unlock(&cifs_tcp_ses_lock);
432 wake_up(&server->response_q);
436 #ifdef CONFIG_CIFS_DFS_UPCALL
437 static int __reconnect_target_unlocked(struct TCP_Server_Info *server, const char *target)
442 if (!cifs_swn_set_server_dstaddr(server)) {
443 if (server->hostname != target) {
444 hostname = extract_hostname(target);
445 if (!IS_ERR(hostname)) {
446 kfree(server->hostname);
447 server->hostname = hostname;
449 cifs_dbg(FYI, "%s: couldn't extract hostname or address from dfs target: %ld\n",
450 __func__, PTR_ERR(hostname));
451 cifs_dbg(FYI, "%s: default to last target server: %s\n", __func__,
455 /* resolve the hostname again to make sure that IP address is up-to-date. */
456 rc = reconn_set_ipaddr_from_hostname(server);
457 cifs_dbg(FYI, "%s: reconn_set_ipaddr_from_hostname: rc=%d\n", __func__, rc);
459 /* Reconnect the socket */
460 if (cifs_rdma_enabled(server))
461 rc = smbd_reconnect(server);
463 rc = generic_ip_connect(server);
468 static int reconnect_target_unlocked(struct TCP_Server_Info *server, struct dfs_cache_tgt_list *tl,
469 struct dfs_cache_tgt_iterator **target_hint)
472 struct dfs_cache_tgt_iterator *tit;
476 /* If dfs target list is empty, then reconnect to last server */
477 tit = dfs_cache_get_tgt_iterator(tl);
479 return __reconnect_target_unlocked(server, server->hostname);
481 /* Otherwise, try every dfs target in @tl */
482 for (; tit; tit = dfs_cache_get_next_tgt(tl, tit)) {
483 rc = __reconnect_target_unlocked(server, dfs_cache_get_tgt_name(tit));
492 static int reconnect_dfs_server(struct TCP_Server_Info *server)
495 const char *refpath = server->current_fullpath + 1;
496 struct dfs_cache_tgt_list tl = DFS_CACHE_TGT_LIST_INIT(tl);
497 struct dfs_cache_tgt_iterator *target_hint = NULL;
501 * Determine the number of dfs targets the referral path in @cifs_sb resolves to.
503 * smb2_reconnect() needs to know how long it should wait based upon the number of dfs
504 * targets (server->nr_targets). It's also possible that the cached referral was cleared
505 * through /proc/fs/cifs/dfscache or the target list is empty due to server settings after
506 * refreshing the referral, so, in this case, default it to 1.
508 if (!dfs_cache_noreq_find(refpath, NULL, &tl))
509 num_targets = dfs_cache_get_nr_tgts(&tl);
513 if (!cifs_tcp_ses_needs_reconnect(server, num_targets))
517 * Unconditionally mark all sessions & tcons for reconnect as we might be connecting to a
518 * different server or share during failover. It could be improved by adding some logic to
519 * only do that in case it connects to a different server or share, though.
521 cifs_mark_tcp_ses_conns_for_reconnect(server, true);
523 cifs_abort_connection(server);
527 cifs_server_lock(server);
529 rc = reconnect_target_unlocked(server, &tl, &target_hint);
531 /* Failed to reconnect socket */
532 cifs_server_unlock(server);
533 cifs_dbg(FYI, "%s: reconnect error %d\n", __func__, rc);
538 * Socket was created. Update tcp session status to CifsNeedNegotiate so that a
539 * process waiting for reconnect will know it needs to re-establish session and tcon
540 * through the reconnected target server.
542 atomic_inc(&tcpSesReconnectCount);
543 set_credits(server, 1);
544 spin_lock(&cifs_tcp_ses_lock);
545 if (server->tcpStatus != CifsExiting)
546 server->tcpStatus = CifsNeedNegotiate;
547 spin_unlock(&cifs_tcp_ses_lock);
548 cifs_swn_reset_server_dstaddr(server);
549 cifs_server_unlock(server);
550 mod_delayed_work(cifsiod_wq, &server->reconnect, 0);
551 } while (server->tcpStatus == CifsNeedReconnect);
554 dfs_cache_noreq_update_tgthint(refpath, target_hint);
556 dfs_cache_free_tgts(&tl);
558 /* Need to set up echo worker again once connection has been established */
559 spin_lock(&cifs_tcp_ses_lock);
560 if (server->tcpStatus == CifsNeedNegotiate)
561 mod_delayed_work(cifsiod_wq, &server->echo, 0);
563 spin_unlock(&cifs_tcp_ses_lock);
565 wake_up(&server->response_q);
569 int cifs_reconnect(struct TCP_Server_Info *server, bool mark_smb_session)
571 /* If tcp session is not an dfs connection, then reconnect to last target server */
572 spin_lock(&cifs_tcp_ses_lock);
573 if (!server->is_dfs_conn) {
574 spin_unlock(&cifs_tcp_ses_lock);
575 return __cifs_reconnect(server, mark_smb_session);
577 spin_unlock(&cifs_tcp_ses_lock);
579 mutex_lock(&server->refpath_lock);
580 if (!server->origin_fullpath || !server->leaf_fullpath) {
581 mutex_unlock(&server->refpath_lock);
582 return __cifs_reconnect(server, mark_smb_session);
584 mutex_unlock(&server->refpath_lock);
586 return reconnect_dfs_server(server);
589 int cifs_reconnect(struct TCP_Server_Info *server, bool mark_smb_session)
591 return __cifs_reconnect(server, mark_smb_session);
596 cifs_echo_request(struct work_struct *work)
599 struct TCP_Server_Info *server = container_of(work,
600 struct TCP_Server_Info, echo.work);
603 * We cannot send an echo if it is disabled.
604 * Also, no need to ping if we got a response recently.
607 if (server->tcpStatus == CifsNeedReconnect ||
608 server->tcpStatus == CifsExiting ||
609 server->tcpStatus == CifsNew ||
610 (server->ops->can_echo && !server->ops->can_echo(server)) ||
611 time_before(jiffies, server->lstrp + server->echo_interval - HZ))
614 rc = server->ops->echo ? server->ops->echo(server) : -ENOSYS;
616 cifs_dbg(FYI, "Unable to send echo request to server: %s\n",
619 /* Check witness registrations */
623 queue_delayed_work(cifsiod_wq, &server->echo, server->echo_interval);
627 allocate_buffers(struct TCP_Server_Info *server)
629 if (!server->bigbuf) {
630 server->bigbuf = (char *)cifs_buf_get();
631 if (!server->bigbuf) {
632 cifs_server_dbg(VFS, "No memory for large SMB response\n");
634 /* retry will check if exiting */
637 } else if (server->large_buf) {
638 /* we are reusing a dirty large buf, clear its start */
639 memset(server->bigbuf, 0, HEADER_SIZE(server));
642 if (!server->smallbuf) {
643 server->smallbuf = (char *)cifs_small_buf_get();
644 if (!server->smallbuf) {
645 cifs_server_dbg(VFS, "No memory for SMB response\n");
647 /* retry will check if exiting */
650 /* beginning of smb buffer is cleared in our buf_get */
652 /* if existing small buf clear beginning */
653 memset(server->smallbuf, 0, HEADER_SIZE(server));
660 server_unresponsive(struct TCP_Server_Info *server)
663 * We need to wait 3 echo intervals to make sure we handle such
665 * 1s client sends a normal SMB request
666 * 2s client gets a response
667 * 30s echo workqueue job pops, and decides we got a response recently
668 * and don't need to send another
670 * 65s kernel_recvmsg times out, and we see that we haven't gotten
671 * a response in >60s.
673 spin_lock(&cifs_tcp_ses_lock);
674 if ((server->tcpStatus == CifsGood ||
675 server->tcpStatus == CifsNeedNegotiate) &&
676 (!server->ops->can_echo || server->ops->can_echo(server)) &&
677 time_after(jiffies, server->lstrp + 3 * server->echo_interval)) {
678 spin_unlock(&cifs_tcp_ses_lock);
679 cifs_server_dbg(VFS, "has not responded in %lu seconds. Reconnecting...\n",
680 (3 * server->echo_interval) / HZ);
681 cifs_reconnect(server, false);
684 spin_unlock(&cifs_tcp_ses_lock);
690 zero_credits(struct TCP_Server_Info *server)
694 spin_lock(&server->req_lock);
695 val = server->credits + server->echo_credits + server->oplock_credits;
696 if (server->in_flight == 0 && val == 0) {
697 spin_unlock(&server->req_lock);
700 spin_unlock(&server->req_lock);
705 cifs_readv_from_socket(struct TCP_Server_Info *server, struct msghdr *smb_msg)
710 smb_msg->msg_control = NULL;
711 smb_msg->msg_controllen = 0;
713 for (total_read = 0; msg_data_left(smb_msg); total_read += length) {
716 /* reconnect if no credits and no requests in flight */
717 if (zero_credits(server)) {
718 cifs_reconnect(server, false);
719 return -ECONNABORTED;
722 if (server_unresponsive(server))
723 return -ECONNABORTED;
724 if (cifs_rdma_enabled(server) && server->smbd_conn)
725 length = smbd_recv(server->smbd_conn, smb_msg);
727 length = sock_recvmsg(server->ssocket, smb_msg, 0);
729 spin_lock(&cifs_tcp_ses_lock);
730 if (server->tcpStatus == CifsExiting) {
731 spin_unlock(&cifs_tcp_ses_lock);
735 if (server->tcpStatus == CifsNeedReconnect) {
736 spin_unlock(&cifs_tcp_ses_lock);
737 cifs_reconnect(server, false);
738 return -ECONNABORTED;
740 spin_unlock(&cifs_tcp_ses_lock);
742 if (length == -ERESTARTSYS ||
746 * Minimum sleep to prevent looping, allowing socket
747 * to clear and app threads to set tcpStatus
748 * CifsNeedReconnect if server hung.
750 usleep_range(1000, 2000);
756 cifs_dbg(FYI, "Received no data or error: %d\n", length);
757 cifs_reconnect(server, false);
758 return -ECONNABORTED;
765 cifs_read_from_socket(struct TCP_Server_Info *server, char *buf,
766 unsigned int to_read)
768 struct msghdr smb_msg;
769 struct kvec iov = {.iov_base = buf, .iov_len = to_read};
770 iov_iter_kvec(&smb_msg.msg_iter, READ, &iov, 1, to_read);
772 return cifs_readv_from_socket(server, &smb_msg);
776 cifs_discard_from_socket(struct TCP_Server_Info *server, size_t to_read)
778 struct msghdr smb_msg;
781 * iov_iter_discard already sets smb_msg.type and count and iov_offset
782 * and cifs_readv_from_socket sets msg_control and msg_controllen
783 * so little to initialize in struct msghdr
785 smb_msg.msg_name = NULL;
786 smb_msg.msg_namelen = 0;
787 iov_iter_discard(&smb_msg.msg_iter, READ, to_read);
789 return cifs_readv_from_socket(server, &smb_msg);
793 cifs_read_page_from_socket(struct TCP_Server_Info *server, struct page *page,
794 unsigned int page_offset, unsigned int to_read)
796 struct msghdr smb_msg;
797 struct bio_vec bv = {
798 .bv_page = page, .bv_len = to_read, .bv_offset = page_offset};
799 iov_iter_bvec(&smb_msg.msg_iter, READ, &bv, 1, to_read);
800 return cifs_readv_from_socket(server, &smb_msg);
804 is_smb_response(struct TCP_Server_Info *server, unsigned char type)
807 * The first byte big endian of the length field,
808 * is actually not part of the length but the type
809 * with the most common, zero, as regular data.
812 case RFC1002_SESSION_MESSAGE:
813 /* Regular SMB response */
815 case RFC1002_SESSION_KEEP_ALIVE:
816 cifs_dbg(FYI, "RFC 1002 session keep alive\n");
818 case RFC1002_POSITIVE_SESSION_RESPONSE:
819 cifs_dbg(FYI, "RFC 1002 positive session response\n");
821 case RFC1002_NEGATIVE_SESSION_RESPONSE:
823 * We get this from Windows 98 instead of an error on
824 * SMB negprot response.
826 cifs_dbg(FYI, "RFC 1002 negative session response\n");
827 /* give server a second to clean up */
830 * Always try 445 first on reconnect since we get NACK
831 * on some if we ever connected to port 139 (the NACK
832 * is since we do not begin with RFC1001 session
835 cifs_set_port((struct sockaddr *)&server->dstaddr, CIFS_PORT);
836 cifs_reconnect(server, true);
839 cifs_server_dbg(VFS, "RFC 1002 unknown response type 0x%x\n", type);
840 cifs_reconnect(server, true);
847 dequeue_mid(struct mid_q_entry *mid, bool malformed)
849 #ifdef CONFIG_CIFS_STATS2
850 mid->when_received = jiffies;
852 spin_lock(&GlobalMid_Lock);
854 mid->mid_state = MID_RESPONSE_RECEIVED;
856 mid->mid_state = MID_RESPONSE_MALFORMED;
858 * Trying to handle/dequeue a mid after the send_recv()
859 * function has finished processing it is a bug.
861 if (mid->mid_flags & MID_DELETED) {
862 spin_unlock(&GlobalMid_Lock);
863 pr_warn_once("trying to dequeue a deleted mid\n");
865 list_del_init(&mid->qhead);
866 mid->mid_flags |= MID_DELETED;
867 spin_unlock(&GlobalMid_Lock);
872 smb2_get_credits_from_hdr(char *buffer, struct TCP_Server_Info *server)
874 struct smb2_hdr *shdr = (struct smb2_hdr *)buffer;
877 * SMB1 does not use credits.
879 if (server->vals->header_preamble_size)
882 return le16_to_cpu(shdr->CreditRequest);
886 handle_mid(struct mid_q_entry *mid, struct TCP_Server_Info *server,
887 char *buf, int malformed)
889 if (server->ops->check_trans2 &&
890 server->ops->check_trans2(mid, server, buf, malformed))
892 mid->credits_received = smb2_get_credits_from_hdr(buf, server);
894 mid->large_buf = server->large_buf;
895 /* Was previous buf put in mpx struct for multi-rsp? */
896 if (!mid->multiRsp) {
897 /* smb buffer will be freed by user thread */
898 if (server->large_buf)
899 server->bigbuf = NULL;
901 server->smallbuf = NULL;
903 dequeue_mid(mid, malformed);
906 static void clean_demultiplex_info(struct TCP_Server_Info *server)
910 /* take it off the list, if it's not already */
911 spin_lock(&cifs_tcp_ses_lock);
912 list_del_init(&server->tcp_ses_list);
913 spin_unlock(&cifs_tcp_ses_lock);
915 cancel_delayed_work_sync(&server->echo);
916 cancel_delayed_work_sync(&server->resolve);
918 spin_lock(&cifs_tcp_ses_lock);
919 server->tcpStatus = CifsExiting;
920 spin_unlock(&cifs_tcp_ses_lock);
921 wake_up_all(&server->response_q);
923 /* check if we have blocked requests that need to free */
924 spin_lock(&server->req_lock);
925 if (server->credits <= 0)
927 spin_unlock(&server->req_lock);
929 * Although there should not be any requests blocked on this queue it
930 * can not hurt to be paranoid and try to wake up requests that may
931 * haven been blocked when more than 50 at time were on the wire to the
932 * same server - they now will see the session is in exit state and get
933 * out of SendReceive.
935 wake_up_all(&server->request_q);
936 /* give those requests time to exit */
938 if (cifs_rdma_enabled(server))
939 smbd_destroy(server);
940 if (server->ssocket) {
941 sock_release(server->ssocket);
942 server->ssocket = NULL;
945 if (!list_empty(&server->pending_mid_q)) {
946 struct list_head dispose_list;
947 struct mid_q_entry *mid_entry;
948 struct list_head *tmp, *tmp2;
950 INIT_LIST_HEAD(&dispose_list);
951 spin_lock(&GlobalMid_Lock);
952 list_for_each_safe(tmp, tmp2, &server->pending_mid_q) {
953 mid_entry = list_entry(tmp, struct mid_q_entry, qhead);
954 cifs_dbg(FYI, "Clearing mid %llu\n", mid_entry->mid);
955 kref_get(&mid_entry->refcount);
956 mid_entry->mid_state = MID_SHUTDOWN;
957 list_move(&mid_entry->qhead, &dispose_list);
958 mid_entry->mid_flags |= MID_DELETED;
960 spin_unlock(&GlobalMid_Lock);
962 /* now walk dispose list and issue callbacks */
963 list_for_each_safe(tmp, tmp2, &dispose_list) {
964 mid_entry = list_entry(tmp, struct mid_q_entry, qhead);
965 cifs_dbg(FYI, "Callback mid %llu\n", mid_entry->mid);
966 list_del_init(&mid_entry->qhead);
967 mid_entry->callback(mid_entry);
968 cifs_mid_q_entry_release(mid_entry);
970 /* 1/8th of sec is more than enough time for them to exit */
974 if (!list_empty(&server->pending_mid_q)) {
976 * mpx threads have not exited yet give them at least the smb
977 * send timeout time for long ops.
979 * Due to delays on oplock break requests, we need to wait at
980 * least 45 seconds before giving up on a request getting a
981 * response and going ahead and killing cifsd.
983 cifs_dbg(FYI, "Wait for exit from demultiplex thread\n");
986 * If threads still have not exited they are probably never
987 * coming home not much else we can do but free the memory.
991 #ifdef CONFIG_CIFS_DFS_UPCALL
992 kfree(server->origin_fullpath);
993 kfree(server->leaf_fullpath);
997 length = atomic_dec_return(&tcpSesAllocCount);
999 mempool_resize(cifs_req_poolp, length + cifs_min_rcv);
1003 standard_receive3(struct TCP_Server_Info *server, struct mid_q_entry *mid)
1006 char *buf = server->smallbuf;
1007 unsigned int pdu_length = server->pdu_size;
1009 /* make sure this will fit in a large buffer */
1010 if (pdu_length > CIFSMaxBufSize + MAX_HEADER_SIZE(server) -
1011 server->vals->header_preamble_size) {
1012 cifs_server_dbg(VFS, "SMB response too long (%u bytes)\n", pdu_length);
1013 cifs_reconnect(server, true);
1014 return -ECONNABORTED;
1017 /* switch to large buffer if too big for a small one */
1018 if (pdu_length > MAX_CIFS_SMALL_BUFFER_SIZE - 4) {
1019 server->large_buf = true;
1020 memcpy(server->bigbuf, buf, server->total_read);
1021 buf = server->bigbuf;
1024 /* now read the rest */
1025 length = cifs_read_from_socket(server, buf + HEADER_SIZE(server) - 1,
1026 pdu_length - HEADER_SIZE(server) + 1
1027 + server->vals->header_preamble_size);
1031 server->total_read += length;
1033 dump_smb(buf, server->total_read);
1035 return cifs_handle_standard(server, mid);
1039 cifs_handle_standard(struct TCP_Server_Info *server, struct mid_q_entry *mid)
1041 char *buf = server->large_buf ? server->bigbuf : server->smallbuf;
1045 * We know that we received enough to get to the MID as we
1046 * checked the pdu_length earlier. Now check to see
1047 * if the rest of the header is OK. We borrow the length
1048 * var for the rest of the loop to avoid a new stack var.
1050 * 48 bytes is enough to display the header and a little bit
1051 * into the payload for debugging purposes.
1053 length = server->ops->check_message(buf, server->total_read, server);
1055 cifs_dump_mem("Bad SMB: ", buf,
1056 min_t(unsigned int, server->total_read, 48));
1058 if (server->ops->is_session_expired &&
1059 server->ops->is_session_expired(buf)) {
1060 cifs_reconnect(server, true);
1064 if (server->ops->is_status_pending &&
1065 server->ops->is_status_pending(buf, server))
1071 handle_mid(mid, server, buf, length);
1076 smb2_add_credits_from_hdr(char *buffer, struct TCP_Server_Info *server)
1078 struct smb2_hdr *shdr = (struct smb2_hdr *)buffer;
1079 int scredits, in_flight;
1082 * SMB1 does not use credits.
1084 if (server->vals->header_preamble_size)
1087 if (shdr->CreditRequest) {
1088 spin_lock(&server->req_lock);
1089 server->credits += le16_to_cpu(shdr->CreditRequest);
1090 scredits = server->credits;
1091 in_flight = server->in_flight;
1092 spin_unlock(&server->req_lock);
1093 wake_up(&server->request_q);
1095 trace_smb3_hdr_credits(server->CurrentMid,
1096 server->conn_id, server->hostname, scredits,
1097 le16_to_cpu(shdr->CreditRequest), in_flight);
1098 cifs_server_dbg(FYI, "%s: added %u credits total=%d\n",
1099 __func__, le16_to_cpu(shdr->CreditRequest),
1106 cifs_demultiplex_thread(void *p)
1108 int i, num_mids, length;
1109 struct TCP_Server_Info *server = p;
1110 unsigned int pdu_length;
1111 unsigned int next_offset;
1113 struct task_struct *task_to_wake = NULL;
1114 struct mid_q_entry *mids[MAX_COMPOUND];
1115 char *bufs[MAX_COMPOUND];
1116 unsigned int noreclaim_flag, num_io_timeout = 0;
1118 noreclaim_flag = memalloc_noreclaim_save();
1119 cifs_dbg(FYI, "Demultiplex PID: %d\n", task_pid_nr(current));
1121 length = atomic_inc_return(&tcpSesAllocCount);
1123 mempool_resize(cifs_req_poolp, length + cifs_min_rcv);
1126 allow_kernel_signal(SIGKILL);
1127 while (server->tcpStatus != CifsExiting) {
1128 if (try_to_freeze())
1131 if (!allocate_buffers(server))
1134 server->large_buf = false;
1135 buf = server->smallbuf;
1136 pdu_length = 4; /* enough to get RFC1001 header */
1138 length = cifs_read_from_socket(server, buf, pdu_length);
1142 if (server->vals->header_preamble_size == 0)
1143 server->total_read = 0;
1145 server->total_read = length;
1148 * The right amount was read from socket - 4 bytes,
1149 * so we can now interpret the length field.
1151 pdu_length = get_rfc1002_length(buf);
1153 cifs_dbg(FYI, "RFC1002 header 0x%x\n", pdu_length);
1154 if (!is_smb_response(server, buf[0]))
1157 server->pdu_size = pdu_length;
1159 /* make sure we have enough to get to the MID */
1160 if (server->pdu_size < HEADER_SIZE(server) - 1 -
1161 server->vals->header_preamble_size) {
1162 cifs_server_dbg(VFS, "SMB response too short (%u bytes)\n",
1164 cifs_reconnect(server, true);
1168 /* read down to the MID */
1169 length = cifs_read_from_socket(server,
1170 buf + server->vals->header_preamble_size,
1171 HEADER_SIZE(server) - 1
1172 - server->vals->header_preamble_size);
1175 server->total_read += length;
1177 if (server->ops->next_header) {
1178 next_offset = server->ops->next_header(buf);
1180 server->pdu_size = next_offset;
1183 memset(mids, 0, sizeof(mids));
1184 memset(bufs, 0, sizeof(bufs));
1187 if (server->ops->is_transform_hdr &&
1188 server->ops->receive_transform &&
1189 server->ops->is_transform_hdr(buf)) {
1190 length = server->ops->receive_transform(server,
1195 mids[0] = server->ops->find_mid(server, buf);
1199 if (!mids[0] || !mids[0]->receive)
1200 length = standard_receive3(server, mids[0]);
1202 length = mids[0]->receive(server, mids[0]);
1206 for (i = 0; i < num_mids; i++)
1208 cifs_mid_q_entry_release(mids[i]);
1212 if (server->ops->is_status_io_timeout &&
1213 server->ops->is_status_io_timeout(buf)) {
1215 if (num_io_timeout > NUM_STATUS_IO_TIMEOUT) {
1216 cifs_reconnect(server, false);
1222 server->lstrp = jiffies;
1224 for (i = 0; i < num_mids; i++) {
1225 if (mids[i] != NULL) {
1226 mids[i]->resp_buf_size = server->pdu_size;
1228 if (bufs[i] && server->ops->is_network_name_deleted)
1229 server->ops->is_network_name_deleted(bufs[i],
1232 if (!mids[i]->multiRsp || mids[i]->multiEnd)
1233 mids[i]->callback(mids[i]);
1235 cifs_mid_q_entry_release(mids[i]);
1236 } else if (server->ops->is_oplock_break &&
1237 server->ops->is_oplock_break(bufs[i],
1239 smb2_add_credits_from_hdr(bufs[i], server);
1240 cifs_dbg(FYI, "Received oplock break\n");
1242 cifs_server_dbg(VFS, "No task to wake, unknown frame received! NumMids %d\n",
1243 atomic_read(&midCount));
1244 cifs_dump_mem("Received Data is: ", bufs[i],
1245 HEADER_SIZE(server));
1246 smb2_add_credits_from_hdr(bufs[i], server);
1247 #ifdef CONFIG_CIFS_DEBUG2
1248 if (server->ops->dump_detail)
1249 server->ops->dump_detail(bufs[i],
1251 cifs_dump_mids(server);
1252 #endif /* CIFS_DEBUG2 */
1256 if (pdu_length > server->pdu_size) {
1257 if (!allocate_buffers(server))
1259 pdu_length -= server->pdu_size;
1260 server->total_read = 0;
1261 server->large_buf = false;
1262 buf = server->smallbuf;
1265 } /* end while !EXITING */
1267 /* buffer usually freed in free_mid - need to free it here on exit */
1268 cifs_buf_release(server->bigbuf);
1269 if (server->smallbuf) /* no sense logging a debug message if NULL */
1270 cifs_small_buf_release(server->smallbuf);
1272 task_to_wake = xchg(&server->tsk, NULL);
1273 clean_demultiplex_info(server);
1275 /* if server->tsk was NULL then wait for a signal before exiting */
1276 if (!task_to_wake) {
1277 set_current_state(TASK_INTERRUPTIBLE);
1278 while (!signal_pending(current)) {
1280 set_current_state(TASK_INTERRUPTIBLE);
1282 set_current_state(TASK_RUNNING);
1285 memalloc_noreclaim_restore(noreclaim_flag);
1286 module_put_and_kthread_exit(0);
1290 * Returns true if srcaddr isn't specified and rhs isn't specified, or
1291 * if srcaddr is specified and matches the IP address of the rhs argument
1294 cifs_match_ipaddr(struct sockaddr *srcaddr, struct sockaddr *rhs)
1296 switch (srcaddr->sa_family) {
1298 return (rhs->sa_family == AF_UNSPEC);
1300 struct sockaddr_in *saddr4 = (struct sockaddr_in *)srcaddr;
1301 struct sockaddr_in *vaddr4 = (struct sockaddr_in *)rhs;
1302 return (saddr4->sin_addr.s_addr == vaddr4->sin_addr.s_addr);
1305 struct sockaddr_in6 *saddr6 = (struct sockaddr_in6 *)srcaddr;
1306 struct sockaddr_in6 *vaddr6 = (struct sockaddr_in6 *)rhs;
1307 return ipv6_addr_equal(&saddr6->sin6_addr, &vaddr6->sin6_addr);
1311 return false; /* don't expect to be here */
1316 * If no port is specified in addr structure, we try to match with 445 port
1317 * and if it fails - with 139 ports. It should be called only if address
1318 * families of server and addr are equal.
1321 match_port(struct TCP_Server_Info *server, struct sockaddr *addr)
1323 __be16 port, *sport;
1325 /* SMBDirect manages its own ports, don't match it here */
1329 switch (addr->sa_family) {
1331 sport = &((struct sockaddr_in *) &server->dstaddr)->sin_port;
1332 port = ((struct sockaddr_in *) addr)->sin_port;
1335 sport = &((struct sockaddr_in6 *) &server->dstaddr)->sin6_port;
1336 port = ((struct sockaddr_in6 *) addr)->sin6_port;
1344 port = htons(CIFS_PORT);
1348 port = htons(RFC1001_PORT);
1351 return port == *sport;
1355 match_address(struct TCP_Server_Info *server, struct sockaddr *addr,
1356 struct sockaddr *srcaddr)
1358 switch (addr->sa_family) {
1360 struct sockaddr_in *addr4 = (struct sockaddr_in *)addr;
1361 struct sockaddr_in *srv_addr4 =
1362 (struct sockaddr_in *)&server->dstaddr;
1364 if (addr4->sin_addr.s_addr != srv_addr4->sin_addr.s_addr)
1369 struct sockaddr_in6 *addr6 = (struct sockaddr_in6 *)addr;
1370 struct sockaddr_in6 *srv_addr6 =
1371 (struct sockaddr_in6 *)&server->dstaddr;
1373 if (!ipv6_addr_equal(&addr6->sin6_addr,
1374 &srv_addr6->sin6_addr))
1376 if (addr6->sin6_scope_id != srv_addr6->sin6_scope_id)
1382 return false; /* don't expect to be here */
1385 if (!cifs_match_ipaddr(srcaddr, (struct sockaddr *)&server->srcaddr))
1392 match_security(struct TCP_Server_Info *server, struct smb3_fs_context *ctx)
1395 * The select_sectype function should either return the ctx->sectype
1396 * that was specified, or "Unspecified" if that sectype was not
1397 * compatible with the given NEGOTIATE request.
1399 if (server->ops->select_sectype(server, ctx->sectype)
1404 * Now check if signing mode is acceptable. No need to check
1405 * global_secflags at this point since if MUST_SIGN is set then
1406 * the server->sign had better be too.
1408 if (ctx->sign && !server->sign)
1414 static int match_server(struct TCP_Server_Info *server, struct smb3_fs_context *ctx)
1416 struct sockaddr *addr = (struct sockaddr *)&ctx->dstaddr;
1418 if (ctx->nosharesock)
1421 /* this server does not share socket */
1422 if (server->nosharesock)
1425 /* If multidialect negotiation see if existing sessions match one */
1426 if (strcmp(ctx->vals->version_string, SMB3ANY_VERSION_STRING) == 0) {
1427 if (server->vals->protocol_id < SMB30_PROT_ID)
1429 } else if (strcmp(ctx->vals->version_string,
1430 SMBDEFAULT_VERSION_STRING) == 0) {
1431 if (server->vals->protocol_id < SMB21_PROT_ID)
1433 } else if ((server->vals != ctx->vals) || (server->ops != ctx->ops))
1436 if (!net_eq(cifs_net_ns(server), current->nsproxy->net_ns))
1439 if (strcasecmp(server->hostname, ctx->server_hostname))
1442 if (!match_address(server, addr,
1443 (struct sockaddr *)&ctx->srcaddr))
1446 if (!match_port(server, addr))
1449 if (!match_security(server, ctx))
1452 if (server->echo_interval != ctx->echo_interval * HZ)
1455 if (server->rdma != ctx->rdma)
1458 if (server->ignore_signature != ctx->ignore_signature)
1461 if (server->min_offload != ctx->min_offload)
1467 struct TCP_Server_Info *
1468 cifs_find_tcp_session(struct smb3_fs_context *ctx)
1470 struct TCP_Server_Info *server;
1472 spin_lock(&cifs_tcp_ses_lock);
1473 list_for_each_entry(server, &cifs_tcp_ses_list, tcp_ses_list) {
1474 #ifdef CONFIG_CIFS_DFS_UPCALL
1476 * DFS failover implementation in cifs_reconnect() requires unique tcp sessions for
1477 * DFS connections to do failover properly, so avoid sharing them with regular
1478 * shares or even links that may connect to same server but having completely
1479 * different failover targets.
1481 if (server->is_dfs_conn)
1485 * Skip ses channels since they're only handled in lower layers
1486 * (e.g. cifs_send_recv).
1488 if (CIFS_SERVER_IS_CHAN(server) || !match_server(server, ctx))
1491 ++server->srv_count;
1492 spin_unlock(&cifs_tcp_ses_lock);
1493 cifs_dbg(FYI, "Existing tcp session with server found\n");
1496 spin_unlock(&cifs_tcp_ses_lock);
1501 cifs_put_tcp_session(struct TCP_Server_Info *server, int from_reconnect)
1503 struct task_struct *task;
1505 spin_lock(&cifs_tcp_ses_lock);
1506 if (--server->srv_count > 0) {
1507 spin_unlock(&cifs_tcp_ses_lock);
1511 /* srv_count can never go negative */
1512 WARN_ON(server->srv_count < 0);
1514 put_net(cifs_net_ns(server));
1516 list_del_init(&server->tcp_ses_list);
1517 spin_unlock(&cifs_tcp_ses_lock);
1519 /* For secondary channels, we pick up ref-count on the primary server */
1520 if (CIFS_SERVER_IS_CHAN(server))
1521 cifs_put_tcp_session(server->primary_server, from_reconnect);
1523 cancel_delayed_work_sync(&server->echo);
1524 cancel_delayed_work_sync(&server->resolve);
1528 * Avoid deadlock here: reconnect work calls
1529 * cifs_put_tcp_session() at its end. Need to be sure
1530 * that reconnect work does nothing with server pointer after
1533 cancel_delayed_work(&server->reconnect);
1535 cancel_delayed_work_sync(&server->reconnect);
1537 spin_lock(&cifs_tcp_ses_lock);
1538 server->tcpStatus = CifsExiting;
1539 spin_unlock(&cifs_tcp_ses_lock);
1541 cifs_crypto_secmech_release(server);
1543 kfree(server->session_key.response);
1544 server->session_key.response = NULL;
1545 server->session_key.len = 0;
1546 kfree(server->hostname);
1548 task = xchg(&server->tsk, NULL);
1550 send_sig(SIGKILL, task, 1);
1553 struct TCP_Server_Info *
1554 cifs_get_tcp_session(struct smb3_fs_context *ctx,
1555 struct TCP_Server_Info *primary_server)
1557 struct TCP_Server_Info *tcp_ses = NULL;
1560 cifs_dbg(FYI, "UNC: %s\n", ctx->UNC);
1562 /* see if we already have a matching tcp_ses */
1563 tcp_ses = cifs_find_tcp_session(ctx);
1567 tcp_ses = kzalloc(sizeof(struct TCP_Server_Info), GFP_KERNEL);
1573 tcp_ses->hostname = kstrdup(ctx->server_hostname, GFP_KERNEL);
1574 if (!tcp_ses->hostname) {
1579 if (ctx->nosharesock)
1580 tcp_ses->nosharesock = true;
1582 tcp_ses->ops = ctx->ops;
1583 tcp_ses->vals = ctx->vals;
1584 cifs_set_net_ns(tcp_ses, get_net(current->nsproxy->net_ns));
1586 tcp_ses->conn_id = atomic_inc_return(&tcpSesNextId);
1587 tcp_ses->noblockcnt = ctx->rootfs;
1588 tcp_ses->noblocksnd = ctx->noblocksnd || ctx->rootfs;
1589 tcp_ses->noautotune = ctx->noautotune;
1590 tcp_ses->tcp_nodelay = ctx->sockopt_tcp_nodelay;
1591 tcp_ses->rdma = ctx->rdma;
1592 tcp_ses->in_flight = 0;
1593 tcp_ses->max_in_flight = 0;
1594 tcp_ses->credits = 1;
1595 if (primary_server) {
1596 spin_lock(&cifs_tcp_ses_lock);
1597 ++primary_server->srv_count;
1598 tcp_ses->primary_server = primary_server;
1599 spin_unlock(&cifs_tcp_ses_lock);
1601 init_waitqueue_head(&tcp_ses->response_q);
1602 init_waitqueue_head(&tcp_ses->request_q);
1603 INIT_LIST_HEAD(&tcp_ses->pending_mid_q);
1604 mutex_init(&tcp_ses->_srv_mutex);
1605 memcpy(tcp_ses->workstation_RFC1001_name,
1606 ctx->source_rfc1001_name, RFC1001_NAME_LEN_WITH_NULL);
1607 memcpy(tcp_ses->server_RFC1001_name,
1608 ctx->target_rfc1001_name, RFC1001_NAME_LEN_WITH_NULL);
1609 tcp_ses->session_estab = false;
1610 tcp_ses->sequence_number = 0;
1611 tcp_ses->reconnect_instance = 1;
1612 tcp_ses->lstrp = jiffies;
1613 tcp_ses->compress_algorithm = cpu_to_le16(ctx->compression);
1614 spin_lock_init(&tcp_ses->req_lock);
1615 INIT_LIST_HEAD(&tcp_ses->tcp_ses_list);
1616 INIT_LIST_HEAD(&tcp_ses->smb_ses_list);
1617 INIT_DELAYED_WORK(&tcp_ses->echo, cifs_echo_request);
1618 INIT_DELAYED_WORK(&tcp_ses->resolve, cifs_resolve_server);
1619 INIT_DELAYED_WORK(&tcp_ses->reconnect, smb2_reconnect_server);
1620 mutex_init(&tcp_ses->reconnect_mutex);
1621 #ifdef CONFIG_CIFS_DFS_UPCALL
1622 mutex_init(&tcp_ses->refpath_lock);
1624 memcpy(&tcp_ses->srcaddr, &ctx->srcaddr,
1625 sizeof(tcp_ses->srcaddr));
1626 memcpy(&tcp_ses->dstaddr, &ctx->dstaddr,
1627 sizeof(tcp_ses->dstaddr));
1628 if (ctx->use_client_guid)
1629 memcpy(tcp_ses->client_guid, ctx->client_guid,
1630 SMB2_CLIENT_GUID_SIZE);
1632 generate_random_uuid(tcp_ses->client_guid);
1634 * at this point we are the only ones with the pointer
1635 * to the struct since the kernel thread not created yet
1636 * no need to spinlock this init of tcpStatus or srv_count
1638 tcp_ses->tcpStatus = CifsNew;
1639 ++tcp_ses->srv_count;
1641 if (ctx->echo_interval >= SMB_ECHO_INTERVAL_MIN &&
1642 ctx->echo_interval <= SMB_ECHO_INTERVAL_MAX)
1643 tcp_ses->echo_interval = ctx->echo_interval * HZ;
1645 tcp_ses->echo_interval = SMB_ECHO_INTERVAL_DEFAULT * HZ;
1646 if (tcp_ses->rdma) {
1647 #ifndef CONFIG_CIFS_SMB_DIRECT
1648 cifs_dbg(VFS, "CONFIG_CIFS_SMB_DIRECT is not enabled\n");
1650 goto out_err_crypto_release;
1652 tcp_ses->smbd_conn = smbd_get_connection(
1653 tcp_ses, (struct sockaddr *)&ctx->dstaddr);
1654 if (tcp_ses->smbd_conn) {
1655 cifs_dbg(VFS, "RDMA transport established\n");
1657 goto smbd_connected;
1660 goto out_err_crypto_release;
1663 rc = ip_connect(tcp_ses);
1665 cifs_dbg(VFS, "Error connecting to socket. Aborting operation.\n");
1666 goto out_err_crypto_release;
1670 * since we're in a cifs function already, we know that
1671 * this will succeed. No need for try_module_get().
1673 __module_get(THIS_MODULE);
1674 tcp_ses->tsk = kthread_run(cifs_demultiplex_thread,
1676 if (IS_ERR(tcp_ses->tsk)) {
1677 rc = PTR_ERR(tcp_ses->tsk);
1678 cifs_dbg(VFS, "error %d create cifsd thread\n", rc);
1679 module_put(THIS_MODULE);
1680 goto out_err_crypto_release;
1682 tcp_ses->min_offload = ctx->min_offload;
1684 * at this point we are the only ones with the pointer
1685 * to the struct since the kernel thread not created yet
1686 * no need to spinlock this update of tcpStatus
1688 spin_lock(&cifs_tcp_ses_lock);
1689 tcp_ses->tcpStatus = CifsNeedNegotiate;
1690 spin_unlock(&cifs_tcp_ses_lock);
1692 if ((ctx->max_credits < 20) || (ctx->max_credits > 60000))
1693 tcp_ses->max_credits = SMB2_MAX_CREDITS_AVAILABLE;
1695 tcp_ses->max_credits = ctx->max_credits;
1697 tcp_ses->nr_targets = 1;
1698 tcp_ses->ignore_signature = ctx->ignore_signature;
1699 /* thread spawned, put it on the list */
1700 spin_lock(&cifs_tcp_ses_lock);
1701 list_add(&tcp_ses->tcp_ses_list, &cifs_tcp_ses_list);
1702 spin_unlock(&cifs_tcp_ses_lock);
1704 /* queue echo request delayed work */
1705 queue_delayed_work(cifsiod_wq, &tcp_ses->echo, tcp_ses->echo_interval);
1707 /* queue dns resolution delayed work */
1708 cifs_dbg(FYI, "%s: next dns resolution scheduled for %d seconds in the future\n",
1709 __func__, SMB_DNS_RESOLVE_INTERVAL_DEFAULT);
1711 queue_delayed_work(cifsiod_wq, &tcp_ses->resolve, (SMB_DNS_RESOLVE_INTERVAL_DEFAULT * HZ));
1715 out_err_crypto_release:
1716 cifs_crypto_secmech_release(tcp_ses);
1718 put_net(cifs_net_ns(tcp_ses));
1722 if (CIFS_SERVER_IS_CHAN(tcp_ses))
1723 cifs_put_tcp_session(tcp_ses->primary_server, false);
1724 kfree(tcp_ses->hostname);
1725 if (tcp_ses->ssocket)
1726 sock_release(tcp_ses->ssocket);
1732 static int match_session(struct cifs_ses *ses, struct smb3_fs_context *ctx)
1734 if (ctx->sectype != Unspecified &&
1735 ctx->sectype != ses->sectype)
1739 * If an existing session is limited to less channels than
1740 * requested, it should not be reused
1742 spin_lock(&ses->chan_lock);
1743 if (ses->chan_max < ctx->max_channels) {
1744 spin_unlock(&ses->chan_lock);
1747 spin_unlock(&ses->chan_lock);
1749 switch (ses->sectype) {
1751 if (!uid_eq(ctx->cred_uid, ses->cred_uid))
1755 /* NULL username means anonymous session */
1756 if (ses->user_name == NULL) {
1762 /* anything else takes username/password */
1763 if (strncmp(ses->user_name,
1764 ctx->username ? ctx->username : "",
1765 CIFS_MAX_USERNAME_LEN))
1767 if ((ctx->username && strlen(ctx->username) != 0) &&
1768 ses->password != NULL &&
1769 strncmp(ses->password,
1770 ctx->password ? ctx->password : "",
1771 CIFS_MAX_PASSWORD_LEN))
1778 * cifs_setup_ipc - helper to setup the IPC tcon for the session
1779 * @ses: smb session to issue the request on
1780 * @ctx: the superblock configuration context to use for building the
1781 * new tree connection for the IPC (interprocess communication RPC)
1783 * A new IPC connection is made and stored in the session
1784 * tcon_ipc. The IPC tcon has the same lifetime as the session.
1787 cifs_setup_ipc(struct cifs_ses *ses, struct smb3_fs_context *ctx)
1790 struct cifs_tcon *tcon;
1791 char unc[SERVER_NAME_LENGTH + sizeof("//x/IPC$")] = {0};
1793 struct TCP_Server_Info *server = ses->server;
1796 * If the mount request that resulted in the creation of the
1797 * session requires encryption, force IPC to be encrypted too.
1800 if (server->capabilities & SMB2_GLOBAL_CAP_ENCRYPTION)
1803 cifs_server_dbg(VFS,
1804 "IPC: server doesn't support encryption\n");
1809 tcon = tconInfoAlloc();
1813 scnprintf(unc, sizeof(unc), "\\\\%s\\IPC$", server->hostname);
1819 rc = server->ops->tree_connect(xid, ses, unc, tcon, ctx->local_nls);
1823 cifs_server_dbg(VFS, "failed to connect to IPC (rc=%d)\n", rc);
1828 cifs_dbg(FYI, "IPC tcon rc=%d ipc tid=0x%x\n", rc, tcon->tid);
1830 ses->tcon_ipc = tcon;
1836 * cifs_free_ipc - helper to release the session IPC tcon
1837 * @ses: smb session to unmount the IPC from
1839 * Needs to be called everytime a session is destroyed.
1841 * On session close, the IPC is closed and the server must release all tcons of the session.
1842 * No need to send a tree disconnect here.
1844 * Besides, it will make the server to not close durable and resilient files on session close, as
1845 * specified in MS-SMB2 3.3.5.6 Receiving an SMB2 LOGOFF Request.
1848 cifs_free_ipc(struct cifs_ses *ses)
1850 struct cifs_tcon *tcon = ses->tcon_ipc;
1856 ses->tcon_ipc = NULL;
1860 static struct cifs_ses *
1861 cifs_find_smb_ses(struct TCP_Server_Info *server, struct smb3_fs_context *ctx)
1863 struct cifs_ses *ses;
1865 spin_lock(&cifs_tcp_ses_lock);
1866 list_for_each_entry(ses, &server->smb_ses_list, smb_ses_list) {
1867 if (ses->ses_status == SES_EXITING)
1869 if (!match_session(ses, ctx))
1872 spin_unlock(&cifs_tcp_ses_lock);
1875 spin_unlock(&cifs_tcp_ses_lock);
1879 void cifs_put_smb_ses(struct cifs_ses *ses)
1881 unsigned int rc, xid;
1882 unsigned int chan_count;
1883 struct TCP_Server_Info *server = ses->server;
1885 spin_lock(&cifs_tcp_ses_lock);
1886 if (ses->ses_status == SES_EXITING) {
1887 spin_unlock(&cifs_tcp_ses_lock);
1891 cifs_dbg(FYI, "%s: ses_count=%d\n", __func__, ses->ses_count);
1892 cifs_dbg(FYI, "%s: ses ipc: %s\n", __func__, ses->tcon_ipc ? ses->tcon_ipc->treeName : "NONE");
1894 if (--ses->ses_count > 0) {
1895 spin_unlock(&cifs_tcp_ses_lock);
1899 /* ses_count can never go negative */
1900 WARN_ON(ses->ses_count < 0);
1902 if (ses->ses_status == SES_GOOD)
1903 ses->ses_status = SES_EXITING;
1904 spin_unlock(&cifs_tcp_ses_lock);
1908 if (ses->ses_status == SES_EXITING && server->ops->logoff) {
1910 rc = server->ops->logoff(xid, ses);
1912 cifs_server_dbg(VFS, "%s: Session Logoff failure rc=%d\n",
1917 spin_lock(&cifs_tcp_ses_lock);
1918 list_del_init(&ses->smb_ses_list);
1919 spin_unlock(&cifs_tcp_ses_lock);
1921 chan_count = ses->chan_count;
1923 /* close any extra channels */
1924 if (chan_count > 1) {
1927 for (i = 1; i < chan_count; i++) {
1928 if (ses->chans[i].iface) {
1929 kref_put(&ses->chans[i].iface->refcount, release_iface);
1930 ses->chans[i].iface = NULL;
1932 cifs_put_tcp_session(ses->chans[i].server, 0);
1933 ses->chans[i].server = NULL;
1938 cifs_put_tcp_session(server, 0);
1943 /* strlen("cifs:a:") + CIFS_MAX_DOMAINNAME_LEN + 1 */
1944 #define CIFSCREDS_DESC_SIZE (7 + CIFS_MAX_DOMAINNAME_LEN + 1)
1946 /* Populate username and pw fields from keyring if possible */
1948 cifs_set_cifscreds(struct smb3_fs_context *ctx, struct cifs_ses *ses)
1952 const char *delim, *payload;
1956 struct TCP_Server_Info *server = ses->server;
1957 struct sockaddr_in *sa;
1958 struct sockaddr_in6 *sa6;
1959 const struct user_key_payload *upayload;
1961 desc = kmalloc(CIFSCREDS_DESC_SIZE, GFP_KERNEL);
1965 /* try to find an address key first */
1966 switch (server->dstaddr.ss_family) {
1968 sa = (struct sockaddr_in *)&server->dstaddr;
1969 sprintf(desc, "cifs:a:%pI4", &sa->sin_addr.s_addr);
1972 sa6 = (struct sockaddr_in6 *)&server->dstaddr;
1973 sprintf(desc, "cifs:a:%pI6c", &sa6->sin6_addr.s6_addr);
1976 cifs_dbg(FYI, "Bad ss_family (%hu)\n",
1977 server->dstaddr.ss_family);
1982 cifs_dbg(FYI, "%s: desc=%s\n", __func__, desc);
1983 key = request_key(&key_type_logon, desc, "");
1985 if (!ses->domainName) {
1986 cifs_dbg(FYI, "domainName is NULL\n");
1991 /* didn't work, try to find a domain key */
1992 sprintf(desc, "cifs:d:%s", ses->domainName);
1993 cifs_dbg(FYI, "%s: desc=%s\n", __func__, desc);
1994 key = request_key(&key_type_logon, desc, "");
2002 down_read(&key->sem);
2003 upayload = user_key_payload_locked(key);
2004 if (IS_ERR_OR_NULL(upayload)) {
2005 rc = upayload ? PTR_ERR(upayload) : -EINVAL;
2009 /* find first : in payload */
2010 payload = upayload->data;
2011 delim = strnchr(payload, upayload->datalen, ':');
2012 cifs_dbg(FYI, "payload=%s\n", payload);
2014 cifs_dbg(FYI, "Unable to find ':' in payload (datalen=%d)\n",
2020 len = delim - payload;
2021 if (len > CIFS_MAX_USERNAME_LEN || len <= 0) {
2022 cifs_dbg(FYI, "Bad value from username search (len=%zd)\n",
2028 ctx->username = kstrndup(payload, len, GFP_KERNEL);
2029 if (!ctx->username) {
2030 cifs_dbg(FYI, "Unable to allocate %zd bytes for username\n",
2035 cifs_dbg(FYI, "%s: username=%s\n", __func__, ctx->username);
2037 len = key->datalen - (len + 1);
2038 if (len > CIFS_MAX_PASSWORD_LEN || len <= 0) {
2039 cifs_dbg(FYI, "Bad len for password search (len=%zd)\n", len);
2041 kfree(ctx->username);
2042 ctx->username = NULL;
2047 ctx->password = kstrndup(delim, len, GFP_KERNEL);
2048 if (!ctx->password) {
2049 cifs_dbg(FYI, "Unable to allocate %zd bytes for password\n",
2052 kfree(ctx->username);
2053 ctx->username = NULL;
2058 * If we have a domain key then we must set the domainName in the
2061 if (is_domain && ses->domainName) {
2062 ctx->domainname = kstrdup(ses->domainName, GFP_KERNEL);
2063 if (!ctx->domainname) {
2064 cifs_dbg(FYI, "Unable to allocate %zd bytes for domain\n",
2067 kfree(ctx->username);
2068 ctx->username = NULL;
2069 kfree_sensitive(ctx->password);
2070 ctx->password = NULL;
2075 strscpy(ctx->workstation_name, ses->workstation_name, sizeof(ctx->workstation_name));
2082 cifs_dbg(FYI, "%s: returning %d\n", __func__, rc);
2085 #else /* ! CONFIG_KEYS */
2087 cifs_set_cifscreds(struct smb3_fs_context *ctx __attribute__((unused)),
2088 struct cifs_ses *ses __attribute__((unused)))
2092 #endif /* CONFIG_KEYS */
2095 * cifs_get_smb_ses - get a session matching @ctx data from @server
2096 * @server: server to setup the session to
2097 * @ctx: superblock configuration context to use to setup the session
2099 * This function assumes it is being called from cifs_mount() where we
2100 * already got a server reference (server refcount +1). See
2101 * cifs_get_tcon() for refcount explanations.
2104 cifs_get_smb_ses(struct TCP_Server_Info *server, struct smb3_fs_context *ctx)
2108 struct cifs_ses *ses;
2109 struct sockaddr_in *addr = (struct sockaddr_in *)&server->dstaddr;
2110 struct sockaddr_in6 *addr6 = (struct sockaddr_in6 *)&server->dstaddr;
2114 ses = cifs_find_smb_ses(server, ctx);
2116 cifs_dbg(FYI, "Existing smb sess found (status=%d)\n",
2119 spin_lock(&ses->chan_lock);
2120 if (cifs_chan_needs_reconnect(ses, server)) {
2121 spin_unlock(&ses->chan_lock);
2122 cifs_dbg(FYI, "Session needs reconnect\n");
2124 mutex_lock(&ses->session_mutex);
2125 rc = cifs_negotiate_protocol(xid, ses, server);
2127 mutex_unlock(&ses->session_mutex);
2128 /* problem -- put our ses reference */
2129 cifs_put_smb_ses(ses);
2134 rc = cifs_setup_session(xid, ses, server,
2137 mutex_unlock(&ses->session_mutex);
2138 /* problem -- put our reference */
2139 cifs_put_smb_ses(ses);
2143 mutex_unlock(&ses->session_mutex);
2145 spin_lock(&ses->chan_lock);
2147 spin_unlock(&ses->chan_lock);
2149 /* existing SMB ses has a server reference already */
2150 cifs_put_tcp_session(server, 0);
2155 cifs_dbg(FYI, "Existing smb sess not found\n");
2156 ses = sesInfoAlloc();
2160 /* new SMB session uses our server ref */
2161 ses->server = server;
2162 if (server->dstaddr.ss_family == AF_INET6)
2163 sprintf(ses->ip_addr, "%pI6", &addr6->sin6_addr);
2165 sprintf(ses->ip_addr, "%pI4", &addr->sin_addr);
2167 if (ctx->username) {
2168 ses->user_name = kstrdup(ctx->username, GFP_KERNEL);
2169 if (!ses->user_name)
2173 /* ctx->password freed at unmount */
2174 if (ctx->password) {
2175 ses->password = kstrdup(ctx->password, GFP_KERNEL);
2179 if (ctx->domainname) {
2180 ses->domainName = kstrdup(ctx->domainname, GFP_KERNEL);
2181 if (!ses->domainName)
2185 strscpy(ses->workstation_name, ctx->workstation_name, sizeof(ses->workstation_name));
2187 if (ctx->domainauto)
2188 ses->domainAuto = ctx->domainauto;
2189 ses->cred_uid = ctx->cred_uid;
2190 ses->linux_uid = ctx->linux_uid;
2192 ses->sectype = ctx->sectype;
2193 ses->sign = ctx->sign;
2195 /* add server as first channel */
2196 spin_lock(&ses->chan_lock);
2197 ses->chans[0].server = server;
2198 ses->chan_count = 1;
2199 ses->chan_max = ctx->multichannel ? ctx->max_channels:1;
2200 ses->chans_need_reconnect = 1;
2201 spin_unlock(&ses->chan_lock);
2203 mutex_lock(&ses->session_mutex);
2204 rc = cifs_negotiate_protocol(xid, ses, server);
2206 rc = cifs_setup_session(xid, ses, server, ctx->local_nls);
2207 mutex_unlock(&ses->session_mutex);
2209 /* each channel uses a different signing key */
2210 spin_lock(&ses->chan_lock);
2211 memcpy(ses->chans[0].signkey, ses->smb3signingkey,
2212 sizeof(ses->smb3signingkey));
2213 spin_unlock(&ses->chan_lock);
2219 * success, put it on the list and add it as first channel
2220 * note: the session becomes active soon after this. So you'll
2221 * need to lock before changing something in the session.
2223 spin_lock(&cifs_tcp_ses_lock);
2224 list_add(&ses->smb_ses_list, &server->smb_ses_list);
2225 spin_unlock(&cifs_tcp_ses_lock);
2229 cifs_setup_ipc(ses, ctx);
2239 static int match_tcon(struct cifs_tcon *tcon, struct smb3_fs_context *ctx)
2241 if (tcon->status == TID_EXITING)
2243 if (strncmp(tcon->treeName, ctx->UNC, MAX_TREE_SIZE))
2245 if (tcon->seal != ctx->seal)
2247 if (tcon->snapshot_time != ctx->snapshot_time)
2249 if (tcon->handle_timeout != ctx->handle_timeout)
2251 if (tcon->no_lease != ctx->no_lease)
2253 if (tcon->nodelete != ctx->nodelete)
2258 static struct cifs_tcon *
2259 cifs_find_tcon(struct cifs_ses *ses, struct smb3_fs_context *ctx)
2261 struct list_head *tmp;
2262 struct cifs_tcon *tcon;
2264 spin_lock(&cifs_tcp_ses_lock);
2265 list_for_each(tmp, &ses->tcon_list) {
2266 tcon = list_entry(tmp, struct cifs_tcon, tcon_list);
2268 if (!match_tcon(tcon, ctx))
2271 spin_unlock(&cifs_tcp_ses_lock);
2274 spin_unlock(&cifs_tcp_ses_lock);
2279 cifs_put_tcon(struct cifs_tcon *tcon)
2282 struct cifs_ses *ses;
2285 * IPC tcon share the lifetime of their session and are
2286 * destroyed in the session put function
2288 if (tcon == NULL || tcon->ipc)
2292 cifs_dbg(FYI, "%s: tc_count=%d\n", __func__, tcon->tc_count);
2293 spin_lock(&cifs_tcp_ses_lock);
2294 if (--tcon->tc_count > 0) {
2295 spin_unlock(&cifs_tcp_ses_lock);
2299 /* tc_count can never go negative */
2300 WARN_ON(tcon->tc_count < 0);
2302 list_del_init(&tcon->tcon_list);
2303 spin_unlock(&cifs_tcp_ses_lock);
2305 /* cancel polling of interfaces */
2306 cancel_delayed_work_sync(&tcon->query_interfaces);
2308 if (tcon->use_witness) {
2311 rc = cifs_swn_unregister(tcon);
2313 cifs_dbg(VFS, "%s: Failed to unregister for witness notifications: %d\n",
2319 if (ses->server->ops->tree_disconnect)
2320 ses->server->ops->tree_disconnect(xid, tcon);
2323 cifs_fscache_release_super_cookie(tcon);
2325 cifs_put_smb_ses(ses);
2329 * cifs_get_tcon - get a tcon matching @ctx data from @ses
2330 * @ses: smb session to issue the request on
2331 * @ctx: the superblock configuration context to use for building the
2333 * - tcon refcount is the number of mount points using the tcon.
2334 * - ses refcount is the number of tcon using the session.
2336 * 1. This function assumes it is being called from cifs_mount() where
2337 * we already got a session reference (ses refcount +1).
2339 * 2. Since we're in the context of adding a mount point, the end
2340 * result should be either:
2342 * a) a new tcon already allocated with refcount=1 (1 mount point) and
2343 * its session refcount incremented (1 new tcon). This +1 was
2344 * already done in (1).
2346 * b) an existing tcon with refcount+1 (add a mount point to it) and
2347 * identical ses refcount (no new tcon). Because of (1) we need to
2348 * decrement the ses refcount.
2350 static struct cifs_tcon *
2351 cifs_get_tcon(struct cifs_ses *ses, struct smb3_fs_context *ctx)
2354 struct cifs_tcon *tcon;
2356 tcon = cifs_find_tcon(ses, ctx);
2359 * tcon has refcount already incremented but we need to
2360 * decrement extra ses reference gotten by caller (case b)
2362 cifs_dbg(FYI, "Found match on UNC path\n");
2363 cifs_put_smb_ses(ses);
2367 if (!ses->server->ops->tree_connect) {
2372 tcon = tconInfoAlloc();
2378 if (ctx->snapshot_time) {
2379 if (ses->server->vals->protocol_id == 0) {
2381 "Use SMB2 or later for snapshot mount option\n");
2385 tcon->snapshot_time = ctx->snapshot_time;
2388 if (ctx->handle_timeout) {
2389 if (ses->server->vals->protocol_id == 0) {
2391 "Use SMB2.1 or later for handle timeout option\n");
2395 tcon->handle_timeout = ctx->handle_timeout;
2399 if (ctx->password) {
2400 tcon->password = kstrdup(ctx->password, GFP_KERNEL);
2401 if (!tcon->password) {
2408 if (ses->server->vals->protocol_id == 0) {
2410 "SMB3 or later required for encryption\n");
2413 } else if (tcon->ses->server->capabilities &
2414 SMB2_GLOBAL_CAP_ENCRYPTION)
2417 cifs_dbg(VFS, "Encryption is not supported on share\n");
2423 if (ctx->linux_ext) {
2424 if (ses->server->posix_ext_supported) {
2425 tcon->posix_extensions = true;
2426 pr_warn_once("SMB3.11 POSIX Extensions are experimental\n");
2427 } else if ((ses->server->vals->protocol_id == SMB311_PROT_ID) ||
2428 (strcmp(ses->server->vals->version_string,
2429 SMB3ANY_VERSION_STRING) == 0) ||
2430 (strcmp(ses->server->vals->version_string,
2431 SMBDEFAULT_VERSION_STRING) == 0)) {
2432 cifs_dbg(VFS, "Server does not support mounting with posix SMB3.11 extensions\n");
2436 cifs_dbg(VFS, "Check vers= mount option. SMB3.11 "
2437 "disabled but required for POSIX extensions\n");
2444 rc = ses->server->ops->tree_connect(xid, ses, ctx->UNC, tcon,
2447 cifs_dbg(FYI, "Tcon rc = %d\n", rc);
2451 tcon->use_persistent = false;
2452 /* check if SMB2 or later, CIFS does not support persistent handles */
2453 if (ctx->persistent) {
2454 if (ses->server->vals->protocol_id == 0) {
2456 "SMB3 or later required for persistent handles\n");
2459 } else if (ses->server->capabilities &
2460 SMB2_GLOBAL_CAP_PERSISTENT_HANDLES)
2461 tcon->use_persistent = true;
2462 else /* persistent handles requested but not supported */ {
2464 "Persistent handles not supported on share\n");
2468 } else if ((tcon->capabilities & SMB2_SHARE_CAP_CONTINUOUS_AVAILABILITY)
2469 && (ses->server->capabilities & SMB2_GLOBAL_CAP_PERSISTENT_HANDLES)
2470 && (ctx->nopersistent == false)) {
2471 cifs_dbg(FYI, "enabling persistent handles\n");
2472 tcon->use_persistent = true;
2473 } else if (ctx->resilient) {
2474 if (ses->server->vals->protocol_id == 0) {
2476 "SMB2.1 or later required for resilient handles\n");
2480 tcon->use_resilient = true;
2483 tcon->use_witness = false;
2484 if (IS_ENABLED(CONFIG_CIFS_SWN_UPCALL) && ctx->witness) {
2485 if (ses->server->vals->protocol_id >= SMB30_PROT_ID) {
2486 if (tcon->capabilities & SMB2_SHARE_CAP_CLUSTER) {
2488 * Set witness in use flag in first place
2489 * to retry registration in the echo task
2491 tcon->use_witness = true;
2492 /* And try to register immediately */
2493 rc = cifs_swn_register(tcon);
2495 cifs_dbg(VFS, "Failed to register for witness notifications: %d\n", rc);
2499 /* TODO: try to extend for non-cluster uses (eg multichannel) */
2500 cifs_dbg(VFS, "witness requested on mount but no CLUSTER capability on share\n");
2505 cifs_dbg(VFS, "SMB3 or later required for witness option\n");
2511 /* If the user really knows what they are doing they can override */
2512 if (tcon->share_flags & SMB2_SHAREFLAG_NO_CACHING) {
2514 cifs_dbg(VFS, "cache=ro requested on mount but NO_CACHING flag set on share\n");
2515 else if (ctx->cache_rw)
2516 cifs_dbg(VFS, "cache=singleclient requested on mount but NO_CACHING flag set on share\n");
2519 if (ctx->no_lease) {
2520 if (ses->server->vals->protocol_id == 0) {
2522 "SMB2 or later required for nolease option\n");
2526 tcon->no_lease = ctx->no_lease;
2530 * We can have only one retry value for a connection to a share so for
2531 * resources mounted more than once to the same server share the last
2532 * value passed in for the retry flag is used.
2534 tcon->retry = ctx->retry;
2535 tcon->nocase = ctx->nocase;
2536 tcon->broken_sparse_sup = ctx->no_sparse;
2537 if (ses->server->capabilities & SMB2_GLOBAL_CAP_DIRECTORY_LEASING)
2538 tcon->nohandlecache = ctx->nohandlecache;
2540 tcon->nohandlecache = true;
2541 tcon->nodelete = ctx->nodelete;
2542 tcon->local_lease = ctx->local_lease;
2543 INIT_LIST_HEAD(&tcon->pending_opens);
2545 /* schedule query interfaces poll */
2546 INIT_DELAYED_WORK(&tcon->query_interfaces,
2547 smb2_query_server_interfaces);
2548 queue_delayed_work(cifsiod_wq, &tcon->query_interfaces,
2549 (SMB_INTERFACE_POLL_INTERVAL * HZ));
2551 spin_lock(&cifs_tcp_ses_lock);
2552 list_add(&tcon->tcon_list, &ses->tcon_list);
2553 spin_unlock(&cifs_tcp_ses_lock);
2563 cifs_put_tlink(struct tcon_link *tlink)
2565 if (!tlink || IS_ERR(tlink))
2568 if (!atomic_dec_and_test(&tlink->tl_count) ||
2569 test_bit(TCON_LINK_IN_TREE, &tlink->tl_flags)) {
2570 tlink->tl_time = jiffies;
2574 if (!IS_ERR(tlink_tcon(tlink)))
2575 cifs_put_tcon(tlink_tcon(tlink));
2581 compare_mount_options(struct super_block *sb, struct cifs_mnt_data *mnt_data)
2583 struct cifs_sb_info *old = CIFS_SB(sb);
2584 struct cifs_sb_info *new = mnt_data->cifs_sb;
2585 unsigned int oldflags = old->mnt_cifs_flags & CIFS_MOUNT_MASK;
2586 unsigned int newflags = new->mnt_cifs_flags & CIFS_MOUNT_MASK;
2588 if ((sb->s_flags & CIFS_MS_MASK) != (mnt_data->flags & CIFS_MS_MASK))
2591 if (old->mnt_cifs_serverino_autodisabled)
2592 newflags &= ~CIFS_MOUNT_SERVER_INUM;
2594 if (oldflags != newflags)
2598 * We want to share sb only if we don't specify an r/wsize or
2599 * specified r/wsize is greater than or equal to existing one.
2601 if (new->ctx->wsize && new->ctx->wsize < old->ctx->wsize)
2604 if (new->ctx->rsize && new->ctx->rsize < old->ctx->rsize)
2607 if (!uid_eq(old->ctx->linux_uid, new->ctx->linux_uid) ||
2608 !gid_eq(old->ctx->linux_gid, new->ctx->linux_gid))
2611 if (old->ctx->file_mode != new->ctx->file_mode ||
2612 old->ctx->dir_mode != new->ctx->dir_mode)
2615 if (strcmp(old->local_nls->charset, new->local_nls->charset))
2618 if (old->ctx->acregmax != new->ctx->acregmax)
2620 if (old->ctx->acdirmax != new->ctx->acdirmax)
2627 match_prepath(struct super_block *sb, struct cifs_mnt_data *mnt_data)
2629 struct cifs_sb_info *old = CIFS_SB(sb);
2630 struct cifs_sb_info *new = mnt_data->cifs_sb;
2631 bool old_set = (old->mnt_cifs_flags & CIFS_MOUNT_USE_PREFIX_PATH) &&
2633 bool new_set = (new->mnt_cifs_flags & CIFS_MOUNT_USE_PREFIX_PATH) &&
2636 if (old_set && new_set && !strcmp(new->prepath, old->prepath))
2638 else if (!old_set && !new_set)
2645 cifs_match_super(struct super_block *sb, void *data)
2647 struct cifs_mnt_data *mnt_data = (struct cifs_mnt_data *)data;
2648 struct smb3_fs_context *ctx;
2649 struct cifs_sb_info *cifs_sb;
2650 struct TCP_Server_Info *tcp_srv;
2651 struct cifs_ses *ses;
2652 struct cifs_tcon *tcon;
2653 struct tcon_link *tlink;
2656 spin_lock(&cifs_tcp_ses_lock);
2657 cifs_sb = CIFS_SB(sb);
2658 tlink = cifs_get_tlink(cifs_sb_master_tlink(cifs_sb));
2659 if (tlink == NULL) {
2660 /* can not match superblock if tlink were ever null */
2661 spin_unlock(&cifs_tcp_ses_lock);
2664 tcon = tlink_tcon(tlink);
2666 tcp_srv = ses->server;
2668 ctx = mnt_data->ctx;
2670 if (!match_server(tcp_srv, ctx) ||
2671 !match_session(ses, ctx) ||
2672 !match_tcon(tcon, ctx) ||
2673 !match_prepath(sb, mnt_data)) {
2678 rc = compare_mount_options(sb, mnt_data);
2680 spin_unlock(&cifs_tcp_ses_lock);
2681 cifs_put_tlink(tlink);
2685 #ifdef CONFIG_DEBUG_LOCK_ALLOC
2686 static struct lock_class_key cifs_key[2];
2687 static struct lock_class_key cifs_slock_key[2];
2690 cifs_reclassify_socket4(struct socket *sock)
2692 struct sock *sk = sock->sk;
2693 BUG_ON(!sock_allow_reclassification(sk));
2694 sock_lock_init_class_and_name(sk, "slock-AF_INET-CIFS",
2695 &cifs_slock_key[0], "sk_lock-AF_INET-CIFS", &cifs_key[0]);
2699 cifs_reclassify_socket6(struct socket *sock)
2701 struct sock *sk = sock->sk;
2702 BUG_ON(!sock_allow_reclassification(sk));
2703 sock_lock_init_class_and_name(sk, "slock-AF_INET6-CIFS",
2704 &cifs_slock_key[1], "sk_lock-AF_INET6-CIFS", &cifs_key[1]);
2708 cifs_reclassify_socket4(struct socket *sock)
2713 cifs_reclassify_socket6(struct socket *sock)
2718 /* See RFC1001 section 14 on representation of Netbios names */
2719 static void rfc1002mangle(char *target, char *source, unsigned int length)
2723 for (i = 0, j = 0; i < (length); i++) {
2724 /* mask a nibble at a time and encode */
2725 target[j] = 'A' + (0x0F & (source[i] >> 4));
2726 target[j+1] = 'A' + (0x0F & source[i]);
2733 bind_socket(struct TCP_Server_Info *server)
2736 if (server->srcaddr.ss_family != AF_UNSPEC) {
2737 /* Bind to the specified local IP address */
2738 struct socket *socket = server->ssocket;
2739 rc = socket->ops->bind(socket,
2740 (struct sockaddr *) &server->srcaddr,
2741 sizeof(server->srcaddr));
2743 struct sockaddr_in *saddr4;
2744 struct sockaddr_in6 *saddr6;
2745 saddr4 = (struct sockaddr_in *)&server->srcaddr;
2746 saddr6 = (struct sockaddr_in6 *)&server->srcaddr;
2747 if (saddr6->sin6_family == AF_INET6)
2748 cifs_server_dbg(VFS, "Failed to bind to: %pI6c, error: %d\n",
2749 &saddr6->sin6_addr, rc);
2751 cifs_server_dbg(VFS, "Failed to bind to: %pI4, error: %d\n",
2752 &saddr4->sin_addr.s_addr, rc);
2759 ip_rfc1001_connect(struct TCP_Server_Info *server)
2763 * some servers require RFC1001 sessinit before sending
2764 * negprot - BB check reconnection in case where second
2765 * sessinit is sent but no second negprot
2767 struct rfc1002_session_packet *ses_init_buf;
2768 struct smb_hdr *smb_buf;
2769 ses_init_buf = kzalloc(sizeof(struct rfc1002_session_packet),
2772 ses_init_buf->trailer.session_req.called_len = 32;
2774 if (server->server_RFC1001_name[0] != 0)
2775 rfc1002mangle(ses_init_buf->trailer.
2776 session_req.called_name,
2777 server->server_RFC1001_name,
2778 RFC1001_NAME_LEN_WITH_NULL);
2780 rfc1002mangle(ses_init_buf->trailer.
2781 session_req.called_name,
2782 DEFAULT_CIFS_CALLED_NAME,
2783 RFC1001_NAME_LEN_WITH_NULL);
2785 ses_init_buf->trailer.session_req.calling_len = 32;
2788 * calling name ends in null (byte 16) from old smb
2791 if (server->workstation_RFC1001_name[0] != 0)
2792 rfc1002mangle(ses_init_buf->trailer.
2793 session_req.calling_name,
2794 server->workstation_RFC1001_name,
2795 RFC1001_NAME_LEN_WITH_NULL);
2797 rfc1002mangle(ses_init_buf->trailer.
2798 session_req.calling_name,
2800 RFC1001_NAME_LEN_WITH_NULL);
2802 ses_init_buf->trailer.session_req.scope1 = 0;
2803 ses_init_buf->trailer.session_req.scope2 = 0;
2804 smb_buf = (struct smb_hdr *)ses_init_buf;
2806 /* sizeof RFC1002_SESSION_REQUEST with no scope */
2807 smb_buf->smb_buf_length = cpu_to_be32(0x81000044);
2808 rc = smb_send(server, smb_buf, 0x44);
2809 kfree(ses_init_buf);
2811 * RFC1001 layer in at least one server
2812 * requires very short break before negprot
2813 * presumably because not expecting negprot
2814 * to follow so fast. This is a simple
2815 * solution that works without
2816 * complicating the code and causes no
2817 * significant slowing down on mount
2820 usleep_range(1000, 2000);
2823 * else the negprot may still work without this
2824 * even though malloc failed
2831 generic_ip_connect(struct TCP_Server_Info *server)
2836 struct socket *socket = server->ssocket;
2837 struct sockaddr *saddr;
2839 saddr = (struct sockaddr *) &server->dstaddr;
2841 if (server->dstaddr.ss_family == AF_INET6) {
2842 struct sockaddr_in6 *ipv6 = (struct sockaddr_in6 *)&server->dstaddr;
2844 sport = ipv6->sin6_port;
2845 slen = sizeof(struct sockaddr_in6);
2847 cifs_dbg(FYI, "%s: connecting to [%pI6]:%d\n", __func__, &ipv6->sin6_addr,
2850 struct sockaddr_in *ipv4 = (struct sockaddr_in *)&server->dstaddr;
2852 sport = ipv4->sin_port;
2853 slen = sizeof(struct sockaddr_in);
2855 cifs_dbg(FYI, "%s: connecting to %pI4:%d\n", __func__, &ipv4->sin_addr,
2859 if (socket == NULL) {
2860 rc = __sock_create(cifs_net_ns(server), sfamily, SOCK_STREAM,
2861 IPPROTO_TCP, &socket, 1);
2863 cifs_server_dbg(VFS, "Error %d creating socket\n", rc);
2864 server->ssocket = NULL;
2868 /* BB other socket options to set KEEPALIVE, NODELAY? */
2869 cifs_dbg(FYI, "Socket created\n");
2870 server->ssocket = socket;
2871 socket->sk->sk_allocation = GFP_NOFS;
2872 if (sfamily == AF_INET6)
2873 cifs_reclassify_socket6(socket);
2875 cifs_reclassify_socket4(socket);
2878 rc = bind_socket(server);
2883 * Eventually check for other socket options to change from
2884 * the default. sock_setsockopt not used because it expects
2887 socket->sk->sk_rcvtimeo = 7 * HZ;
2888 socket->sk->sk_sndtimeo = 5 * HZ;
2890 /* make the bufsizes depend on wsize/rsize and max requests */
2891 if (server->noautotune) {
2892 if (socket->sk->sk_sndbuf < (200 * 1024))
2893 socket->sk->sk_sndbuf = 200 * 1024;
2894 if (socket->sk->sk_rcvbuf < (140 * 1024))
2895 socket->sk->sk_rcvbuf = 140 * 1024;
2898 if (server->tcp_nodelay)
2899 tcp_sock_set_nodelay(socket->sk);
2901 cifs_dbg(FYI, "sndbuf %d rcvbuf %d rcvtimeo 0x%lx\n",
2902 socket->sk->sk_sndbuf,
2903 socket->sk->sk_rcvbuf, socket->sk->sk_rcvtimeo);
2905 rc = socket->ops->connect(socket, saddr, slen,
2906 server->noblockcnt ? O_NONBLOCK : 0);
2908 * When mounting SMB root file systems, we do not want to block in
2909 * connect. Otherwise bail out and then let cifs_reconnect() perform
2910 * reconnect failover - if possible.
2912 if (server->noblockcnt && rc == -EINPROGRESS)
2915 cifs_dbg(FYI, "Error %d connecting to server\n", rc);
2916 trace_smb3_connect_err(server->hostname, server->conn_id, &server->dstaddr, rc);
2917 sock_release(socket);
2918 server->ssocket = NULL;
2921 trace_smb3_connect_done(server->hostname, server->conn_id, &server->dstaddr);
2922 if (sport == htons(RFC1001_PORT))
2923 rc = ip_rfc1001_connect(server);
2929 ip_connect(struct TCP_Server_Info *server)
2932 struct sockaddr_in6 *addr6 = (struct sockaddr_in6 *)&server->dstaddr;
2933 struct sockaddr_in *addr = (struct sockaddr_in *)&server->dstaddr;
2935 if (server->dstaddr.ss_family == AF_INET6)
2936 sport = &addr6->sin6_port;
2938 sport = &addr->sin_port;
2943 /* try with 445 port at first */
2944 *sport = htons(CIFS_PORT);
2946 rc = generic_ip_connect(server);
2950 /* if it failed, try with 139 port */
2951 *sport = htons(RFC1001_PORT);
2954 return generic_ip_connect(server);
2957 void reset_cifs_unix_caps(unsigned int xid, struct cifs_tcon *tcon,
2958 struct cifs_sb_info *cifs_sb, struct smb3_fs_context *ctx)
2961 * If we are reconnecting then should we check to see if
2962 * any requested capabilities changed locally e.g. via
2963 * remount but we can not do much about it here
2964 * if they have (even if we could detect it by the following)
2965 * Perhaps we could add a backpointer to array of sb from tcon
2966 * or if we change to make all sb to same share the same
2967 * sb as NFS - then we only have one backpointer to sb.
2968 * What if we wanted to mount the server share twice once with
2969 * and once without posixacls or posix paths?
2971 __u64 saved_cap = le64_to_cpu(tcon->fsUnixInfo.Capability);
2973 if (ctx && ctx->no_linux_ext) {
2974 tcon->fsUnixInfo.Capability = 0;
2975 tcon->unix_ext = 0; /* Unix Extensions disabled */
2976 cifs_dbg(FYI, "Linux protocol extensions disabled\n");
2979 tcon->unix_ext = 1; /* Unix Extensions supported */
2981 if (!tcon->unix_ext) {
2982 cifs_dbg(FYI, "Unix extensions disabled so not set on reconnect\n");
2986 if (!CIFSSMBQFSUnixInfo(xid, tcon)) {
2987 __u64 cap = le64_to_cpu(tcon->fsUnixInfo.Capability);
2988 cifs_dbg(FYI, "unix caps which server supports %lld\n", cap);
2990 * check for reconnect case in which we do not
2991 * want to change the mount behavior if we can avoid it
2995 * turn off POSIX ACL and PATHNAMES if not set
2996 * originally at mount time
2998 if ((saved_cap & CIFS_UNIX_POSIX_ACL_CAP) == 0)
2999 cap &= ~CIFS_UNIX_POSIX_ACL_CAP;
3000 if ((saved_cap & CIFS_UNIX_POSIX_PATHNAMES_CAP) == 0) {
3001 if (cap & CIFS_UNIX_POSIX_PATHNAMES_CAP)
3002 cifs_dbg(VFS, "POSIXPATH support change\n");
3003 cap &= ~CIFS_UNIX_POSIX_PATHNAMES_CAP;
3004 } else if ((cap & CIFS_UNIX_POSIX_PATHNAMES_CAP) == 0) {
3005 cifs_dbg(VFS, "possible reconnect error\n");
3006 cifs_dbg(VFS, "server disabled POSIX path support\n");
3010 if (cap & CIFS_UNIX_TRANSPORT_ENCRYPTION_MANDATORY_CAP)
3011 cifs_dbg(VFS, "per-share encryption not supported yet\n");
3013 cap &= CIFS_UNIX_CAP_MASK;
3014 if (ctx && ctx->no_psx_acl)
3015 cap &= ~CIFS_UNIX_POSIX_ACL_CAP;
3016 else if (CIFS_UNIX_POSIX_ACL_CAP & cap) {
3017 cifs_dbg(FYI, "negotiated posix acl support\n");
3019 cifs_sb->mnt_cifs_flags |=
3020 CIFS_MOUNT_POSIXACL;
3023 if (ctx && ctx->posix_paths == 0)
3024 cap &= ~CIFS_UNIX_POSIX_PATHNAMES_CAP;
3025 else if (cap & CIFS_UNIX_POSIX_PATHNAMES_CAP) {
3026 cifs_dbg(FYI, "negotiate posix pathnames\n");
3028 cifs_sb->mnt_cifs_flags |=
3029 CIFS_MOUNT_POSIX_PATHS;
3032 cifs_dbg(FYI, "Negotiate caps 0x%x\n", (int)cap);
3033 #ifdef CONFIG_CIFS_DEBUG2
3034 if (cap & CIFS_UNIX_FCNTL_CAP)
3035 cifs_dbg(FYI, "FCNTL cap\n");
3036 if (cap & CIFS_UNIX_EXTATTR_CAP)
3037 cifs_dbg(FYI, "EXTATTR cap\n");
3038 if (cap & CIFS_UNIX_POSIX_PATHNAMES_CAP)
3039 cifs_dbg(FYI, "POSIX path cap\n");
3040 if (cap & CIFS_UNIX_XATTR_CAP)
3041 cifs_dbg(FYI, "XATTR cap\n");
3042 if (cap & CIFS_UNIX_POSIX_ACL_CAP)
3043 cifs_dbg(FYI, "POSIX ACL cap\n");
3044 if (cap & CIFS_UNIX_LARGE_READ_CAP)
3045 cifs_dbg(FYI, "very large read cap\n");
3046 if (cap & CIFS_UNIX_LARGE_WRITE_CAP)
3047 cifs_dbg(FYI, "very large write cap\n");
3048 if (cap & CIFS_UNIX_TRANSPORT_ENCRYPTION_CAP)
3049 cifs_dbg(FYI, "transport encryption cap\n");
3050 if (cap & CIFS_UNIX_TRANSPORT_ENCRYPTION_MANDATORY_CAP)
3051 cifs_dbg(FYI, "mandatory transport encryption cap\n");
3052 #endif /* CIFS_DEBUG2 */
3053 if (CIFSSMBSetFSUnixInfo(xid, tcon, cap)) {
3055 cifs_dbg(FYI, "resetting capabilities failed\n");
3057 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");
3063 int cifs_setup_cifs_sb(struct cifs_sb_info *cifs_sb)
3065 struct smb3_fs_context *ctx = cifs_sb->ctx;
3067 INIT_DELAYED_WORK(&cifs_sb->prune_tlinks, cifs_prune_tlinks);
3069 spin_lock_init(&cifs_sb->tlink_tree_lock);
3070 cifs_sb->tlink_tree = RB_ROOT;
3072 cifs_dbg(FYI, "file mode: %04ho dir mode: %04ho\n",
3073 ctx->file_mode, ctx->dir_mode);
3075 /* this is needed for ASCII cp to Unicode converts */
3076 if (ctx->iocharset == NULL) {
3077 /* load_nls_default cannot return null */
3078 cifs_sb->local_nls = load_nls_default();
3080 cifs_sb->local_nls = load_nls(ctx->iocharset);
3081 if (cifs_sb->local_nls == NULL) {
3082 cifs_dbg(VFS, "CIFS mount error: iocharset %s not found\n",
3087 ctx->local_nls = cifs_sb->local_nls;
3089 smb3_update_mnt_flags(cifs_sb);
3092 cifs_dbg(FYI, "mounting share using direct i/o\n");
3093 if (ctx->cache_ro) {
3094 cifs_dbg(VFS, "mounting share with read only caching. Ensure that the share will not be modified while in use.\n");
3095 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_RO_CACHE;
3096 } else if (ctx->cache_rw) {
3097 cifs_dbg(VFS, "mounting share in single client RW caching mode. Ensure that no other systems will be accessing the share.\n");
3098 cifs_sb->mnt_cifs_flags |= (CIFS_MOUNT_RO_CACHE |
3099 CIFS_MOUNT_RW_CACHE);
3102 if ((ctx->cifs_acl) && (ctx->dynperm))
3103 cifs_dbg(VFS, "mount option dynperm ignored if cifsacl mount option supported\n");
3106 cifs_sb->prepath = kstrdup(ctx->prepath, GFP_KERNEL);
3107 if (cifs_sb->prepath == NULL)
3109 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_USE_PREFIX_PATH;
3115 /* Release all succeed connections */
3116 static inline void mount_put_conns(struct mount_ctx *mnt_ctx)
3121 cifs_put_tcon(mnt_ctx->tcon);
3122 else if (mnt_ctx->ses)
3123 cifs_put_smb_ses(mnt_ctx->ses);
3124 else if (mnt_ctx->server)
3125 cifs_put_tcp_session(mnt_ctx->server, 0);
3126 mnt_ctx->cifs_sb->mnt_cifs_flags &= ~CIFS_MOUNT_POSIX_PATHS;
3127 free_xid(mnt_ctx->xid);
3130 /* Get connections for tcp, ses and tcon */
3131 static int mount_get_conns(struct mount_ctx *mnt_ctx)
3134 struct TCP_Server_Info *server = NULL;
3135 struct cifs_ses *ses = NULL;
3136 struct cifs_tcon *tcon = NULL;
3137 struct smb3_fs_context *ctx = mnt_ctx->fs_ctx;
3138 struct cifs_sb_info *cifs_sb = mnt_ctx->cifs_sb;
3143 /* get a reference to a tcp session */
3144 server = cifs_get_tcp_session(ctx, NULL);
3145 if (IS_ERR(server)) {
3146 rc = PTR_ERR(server);
3151 /* get a reference to a SMB session */
3152 ses = cifs_get_smb_ses(server, ctx);
3159 if ((ctx->persistent == true) && (!(ses->server->capabilities &
3160 SMB2_GLOBAL_CAP_PERSISTENT_HANDLES))) {
3161 cifs_server_dbg(VFS, "persistent handles not supported by server\n");
3166 /* search for existing tcon to this server share */
3167 tcon = cifs_get_tcon(ses, ctx);
3174 /* if new SMB3.11 POSIX extensions are supported do not remap / and \ */
3175 if (tcon->posix_extensions)
3176 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_POSIX_PATHS;
3178 /* tell server which Unix caps we support */
3179 if (cap_unix(tcon->ses)) {
3181 * reset of caps checks mount to see if unix extensions disabled
3182 * for just this mount.
3184 reset_cifs_unix_caps(xid, tcon, cifs_sb, ctx);
3185 spin_lock(&cifs_tcp_ses_lock);
3186 if ((tcon->ses->server->tcpStatus == CifsNeedReconnect) &&
3187 (le64_to_cpu(tcon->fsUnixInfo.Capability) &
3188 CIFS_UNIX_TRANSPORT_ENCRYPTION_MANDATORY_CAP)) {
3189 spin_unlock(&cifs_tcp_ses_lock);
3193 spin_unlock(&cifs_tcp_ses_lock);
3195 tcon->unix_ext = 0; /* server does not support them */
3197 /* do not care if a following call succeed - informational */
3198 if (!tcon->pipe && server->ops->qfs_tcon) {
3199 server->ops->qfs_tcon(xid, tcon, cifs_sb);
3200 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_RO_CACHE) {
3201 if (tcon->fsDevInfo.DeviceCharacteristics &
3202 cpu_to_le32(FILE_READ_ONLY_DEVICE))
3203 cifs_dbg(VFS, "mounted to read only share\n");
3204 else if ((cifs_sb->mnt_cifs_flags &
3205 CIFS_MOUNT_RW_CACHE) == 0)
3206 cifs_dbg(VFS, "read only mount of RW share\n");
3207 /* no need to log a RW mount of a typical RW share */
3212 * Clamp the rsize/wsize mount arguments if they are too big for the server
3213 * and set the rsize/wsize to the negotiated values if not passed in by
3216 if ((cifs_sb->ctx->wsize == 0) ||
3217 (cifs_sb->ctx->wsize > server->ops->negotiate_wsize(tcon, ctx)))
3218 cifs_sb->ctx->wsize = server->ops->negotiate_wsize(tcon, ctx);
3219 if ((cifs_sb->ctx->rsize == 0) ||
3220 (cifs_sb->ctx->rsize > server->ops->negotiate_rsize(tcon, ctx)))
3221 cifs_sb->ctx->rsize = server->ops->negotiate_rsize(tcon, ctx);
3224 * The cookie is initialized from volume info returned above.
3225 * Inside cifs_fscache_get_super_cookie it checks
3226 * that we do not get super cookie twice.
3228 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_FSCACHE)
3229 cifs_fscache_get_super_cookie(tcon);
3232 mnt_ctx->server = server;
3234 mnt_ctx->tcon = tcon;
3240 static int mount_setup_tlink(struct cifs_sb_info *cifs_sb, struct cifs_ses *ses,
3241 struct cifs_tcon *tcon)
3243 struct tcon_link *tlink;
3245 /* hang the tcon off of the superblock */
3246 tlink = kzalloc(sizeof(*tlink), GFP_KERNEL);
3250 tlink->tl_uid = ses->linux_uid;
3251 tlink->tl_tcon = tcon;
3252 tlink->tl_time = jiffies;
3253 set_bit(TCON_LINK_MASTER, &tlink->tl_flags);
3254 set_bit(TCON_LINK_IN_TREE, &tlink->tl_flags);
3256 cifs_sb->master_tlink = tlink;
3257 spin_lock(&cifs_sb->tlink_tree_lock);
3258 tlink_rb_insert(&cifs_sb->tlink_tree, tlink);
3259 spin_unlock(&cifs_sb->tlink_tree_lock);
3261 queue_delayed_work(cifsiod_wq, &cifs_sb->prune_tlinks,
3266 #ifdef CONFIG_CIFS_DFS_UPCALL
3267 /* Get unique dfs connections */
3268 static int mount_get_dfs_conns(struct mount_ctx *mnt_ctx)
3272 mnt_ctx->fs_ctx->nosharesock = true;
3273 rc = mount_get_conns(mnt_ctx);
3274 if (mnt_ctx->server) {
3275 cifs_dbg(FYI, "%s: marking tcp session as a dfs connection\n", __func__);
3276 spin_lock(&cifs_tcp_ses_lock);
3277 mnt_ctx->server->is_dfs_conn = true;
3278 spin_unlock(&cifs_tcp_ses_lock);
3284 * cifs_build_path_to_root returns full path to root when we do not have an
3285 * existing connection (tcon)
3288 build_unc_path_to_root(const struct smb3_fs_context *ctx,
3289 const struct cifs_sb_info *cifs_sb, bool useppath)
3291 char *full_path, *pos;
3292 unsigned int pplen = useppath && ctx->prepath ?
3293 strlen(ctx->prepath) + 1 : 0;
3294 unsigned int unc_len = strnlen(ctx->UNC, MAX_TREE_SIZE + 1);
3296 if (unc_len > MAX_TREE_SIZE)
3297 return ERR_PTR(-EINVAL);
3299 full_path = kmalloc(unc_len + pplen + 1, GFP_KERNEL);
3300 if (full_path == NULL)
3301 return ERR_PTR(-ENOMEM);
3303 memcpy(full_path, ctx->UNC, unc_len);
3304 pos = full_path + unc_len;
3307 *pos = CIFS_DIR_SEP(cifs_sb);
3308 memcpy(pos + 1, ctx->prepath, pplen);
3312 *pos = '\0'; /* add trailing null */
3313 convert_delimiter(full_path, CIFS_DIR_SEP(cifs_sb));
3314 cifs_dbg(FYI, "%s: full_path=%s\n", __func__, full_path);
3319 * expand_dfs_referral - Update cifs_sb from dfs referral path
3321 * cifs_sb->ctx->mount_options will be (re-)allocated to a string containing updated options for the
3322 * submount. Otherwise it will be left untouched.
3324 static int expand_dfs_referral(struct mount_ctx *mnt_ctx, const char *full_path,
3325 struct dfs_info3_param *referral)
3328 struct cifs_sb_info *cifs_sb = mnt_ctx->cifs_sb;
3329 struct smb3_fs_context *ctx = mnt_ctx->fs_ctx;
3330 char *fake_devname = NULL, *mdata = NULL;
3332 mdata = cifs_compose_mount_options(cifs_sb->ctx->mount_options, full_path + 1, referral,
3334 if (IS_ERR(mdata)) {
3335 rc = PTR_ERR(mdata);
3339 * We can not clear out the whole structure since we no longer have an explicit
3340 * function to parse a mount-string. Instead we need to clear out the individual
3341 * fields that are no longer valid.
3343 kfree(ctx->prepath);
3344 ctx->prepath = NULL;
3345 rc = cifs_setup_volume_info(ctx, mdata, fake_devname);
3347 kfree(fake_devname);
3348 kfree(cifs_sb->ctx->mount_options);
3349 cifs_sb->ctx->mount_options = mdata;
3355 /* TODO: all callers to this are broken. We are not parsing mount_options here
3356 * we should pass a clone of the original context?
3359 cifs_setup_volume_info(struct smb3_fs_context *ctx, const char *mntopts, const char *devname)
3364 cifs_dbg(FYI, "%s: devname=%s\n", __func__, devname);
3365 rc = smb3_parse_devname(devname, ctx);
3367 cifs_dbg(VFS, "%s: failed to parse %s: %d\n", __func__, devname, rc);
3375 rc = smb3_parse_opt(mntopts, "ip", &ip);
3377 cifs_dbg(VFS, "%s: failed to parse ip options: %d\n", __func__, rc);
3381 rc = cifs_convert_address((struct sockaddr *)&ctx->dstaddr, ip, strlen(ip));
3384 cifs_dbg(VFS, "%s: failed to convert ip address\n", __func__);
3389 if (ctx->nullauth) {
3390 cifs_dbg(FYI, "Anonymous login\n");
3391 kfree(ctx->username);
3392 ctx->username = NULL;
3393 } else if (ctx->username) {
3394 /* BB fixme parse for domain name here */
3395 cifs_dbg(FYI, "Username: %s\n", ctx->username);
3397 cifs_dbg(VFS, "No username specified\n");
3398 /* In userspace mount helper we can get user name from alternate
3399 locations such as env variables and files on disk */
3407 cifs_are_all_path_components_accessible(struct TCP_Server_Info *server,
3409 struct cifs_tcon *tcon,
3410 struct cifs_sb_info *cifs_sb,
3417 int skip = added_treename ? 1 : 0;
3419 sep = CIFS_DIR_SEP(cifs_sb);
3422 rc = server->ops->is_path_accessible(xid, tcon, cifs_sb, "");
3424 /* skip separators */
3429 /* next separator */
3430 while (*s && *s != sep)
3433 * if the treename is added, we then have to skip the first
3434 * part within the separators
3441 * temporarily null-terminate the path at the end of
3442 * the current component
3446 rc = server->ops->is_path_accessible(xid, tcon, cifs_sb,
3454 * Check if path is remote (i.e. a DFS share).
3456 * Return -EREMOTE if it is, otherwise 0 or -errno.
3458 static int is_path_remote(struct mount_ctx *mnt_ctx)
3461 struct cifs_sb_info *cifs_sb = mnt_ctx->cifs_sb;
3462 struct TCP_Server_Info *server = mnt_ctx->server;
3463 unsigned int xid = mnt_ctx->xid;
3464 struct cifs_tcon *tcon = mnt_ctx->tcon;
3465 struct smb3_fs_context *ctx = mnt_ctx->fs_ctx;
3467 #ifdef CONFIG_CIFS_DFS_UPCALL
3468 bool nodfs = cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_DFS;
3471 if (!server->ops->is_path_accessible)
3475 * cifs_build_path_to_root works only when we have a valid tcon
3477 full_path = cifs_build_path_to_root(ctx, cifs_sb, tcon,
3478 tcon->Flags & SMB_SHARE_IS_IN_DFS);
3479 if (full_path == NULL)
3482 cifs_dbg(FYI, "%s: full_path: %s\n", __func__, full_path);
3484 rc = server->ops->is_path_accessible(xid, tcon, cifs_sb,
3486 #ifdef CONFIG_CIFS_DFS_UPCALL
3493 /* path *might* exist with non-ASCII characters in DFS root
3494 * try again with full path (only if nodfs is not set) */
3495 if (rc == -ENOENT && is_tcon_dfs(tcon))
3496 rc = cifs_dfs_query_info_nonascii_quirk(xid, tcon, cifs_sb,
3499 if (rc != 0 && rc != -EREMOTE)
3502 if (rc != -EREMOTE) {
3503 rc = cifs_are_all_path_components_accessible(server, xid, tcon,
3504 cifs_sb, full_path, tcon->Flags & SMB_SHARE_IS_IN_DFS);
3506 cifs_server_dbg(VFS, "cannot query dirs between root and final path, enabling CIFS_MOUNT_USE_PREFIX_PATH\n");
3507 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_USE_PREFIX_PATH;
3517 #ifdef CONFIG_CIFS_DFS_UPCALL
3518 static void set_root_ses(struct mount_ctx *mnt_ctx)
3521 spin_lock(&cifs_tcp_ses_lock);
3522 mnt_ctx->ses->ses_count++;
3523 spin_unlock(&cifs_tcp_ses_lock);
3524 dfs_cache_add_refsrv_session(&mnt_ctx->mount_id, mnt_ctx->ses);
3526 mnt_ctx->root_ses = mnt_ctx->ses;
3529 static int is_dfs_mount(struct mount_ctx *mnt_ctx, bool *isdfs, struct dfs_cache_tgt_list *root_tl)
3532 struct cifs_sb_info *cifs_sb = mnt_ctx->cifs_sb;
3533 struct smb3_fs_context *ctx = mnt_ctx->fs_ctx;
3537 rc = mount_get_conns(mnt_ctx);
3539 * If called with 'nodfs' mount option, then skip DFS resolving. Otherwise unconditionally
3540 * try to get an DFS referral (even cached) to determine whether it is an DFS mount.
3542 * Skip prefix path to provide support for DFS referrals from w2k8 servers which don't seem
3543 * to respond with PATH_NOT_COVERED to requests that include the prefix.
3545 if ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_DFS) ||
3546 dfs_cache_find(mnt_ctx->xid, mnt_ctx->ses, cifs_sb->local_nls, cifs_remap(cifs_sb),
3547 ctx->UNC + 1, NULL, root_tl)) {
3550 /* Check if it is fully accessible and then mount it */
3551 rc = is_path_remote(mnt_ctx);
3554 else if (rc != -EREMOTE)
3560 static int connect_dfs_target(struct mount_ctx *mnt_ctx, const char *full_path,
3561 const char *ref_path, struct dfs_cache_tgt_iterator *tit)
3564 struct dfs_info3_param ref = {};
3565 struct cifs_sb_info *cifs_sb = mnt_ctx->cifs_sb;
3566 char *oldmnt = cifs_sb->ctx->mount_options;
3568 cifs_dbg(FYI, "%s: full_path=%s ref_path=%s target=%s\n", __func__, full_path, ref_path,
3569 dfs_cache_get_tgt_name(tit));
3571 rc = dfs_cache_get_tgt_referral(ref_path, tit, &ref);
3575 rc = expand_dfs_referral(mnt_ctx, full_path, &ref);
3579 /* Connect to new target only if we were redirected (e.g. mount options changed) */
3580 if (oldmnt != cifs_sb->ctx->mount_options) {
3581 mount_put_conns(mnt_ctx);
3582 rc = mount_get_dfs_conns(mnt_ctx);
3585 if (cifs_is_referral_server(mnt_ctx->tcon, &ref))
3586 set_root_ses(mnt_ctx);
3587 rc = dfs_cache_update_tgthint(mnt_ctx->xid, mnt_ctx->root_ses, cifs_sb->local_nls,
3588 cifs_remap(cifs_sb), ref_path, tit);
3592 free_dfs_info_param(&ref);
3596 static int connect_dfs_root(struct mount_ctx *mnt_ctx, struct dfs_cache_tgt_list *root_tl)
3600 struct cifs_sb_info *cifs_sb = mnt_ctx->cifs_sb;
3601 struct smb3_fs_context *ctx = mnt_ctx->fs_ctx;
3602 struct dfs_cache_tgt_iterator *tit;
3604 /* Put initial connections as they might be shared with other mounts. We need unique dfs
3605 * connections per mount to properly failover, so mount_get_dfs_conns() must be used from
3608 mount_put_conns(mnt_ctx);
3609 mount_get_dfs_conns(mnt_ctx);
3610 set_root_ses(mnt_ctx);
3612 full_path = build_unc_path_to_root(ctx, cifs_sb, true);
3613 if (IS_ERR(full_path))
3614 return PTR_ERR(full_path);
3616 mnt_ctx->origin_fullpath = dfs_cache_canonical_path(ctx->UNC, cifs_sb->local_nls,
3617 cifs_remap(cifs_sb));
3618 if (IS_ERR(mnt_ctx->origin_fullpath)) {
3619 rc = PTR_ERR(mnt_ctx->origin_fullpath);
3620 mnt_ctx->origin_fullpath = NULL;
3624 /* Try all dfs root targets */
3625 for (rc = -ENOENT, tit = dfs_cache_get_tgt_iterator(root_tl);
3626 tit; tit = dfs_cache_get_next_tgt(root_tl, tit)) {
3627 rc = connect_dfs_target(mnt_ctx, full_path, mnt_ctx->origin_fullpath + 1, tit);
3629 mnt_ctx->leaf_fullpath = kstrdup(mnt_ctx->origin_fullpath, GFP_KERNEL);
3630 if (!mnt_ctx->leaf_fullpath)
3641 static int __follow_dfs_link(struct mount_ctx *mnt_ctx)
3644 struct cifs_sb_info *cifs_sb = mnt_ctx->cifs_sb;
3645 struct smb3_fs_context *ctx = mnt_ctx->fs_ctx;
3647 struct dfs_cache_tgt_list tl = DFS_CACHE_TGT_LIST_INIT(tl);
3648 struct dfs_cache_tgt_iterator *tit;
3650 full_path = build_unc_path_to_root(ctx, cifs_sb, true);
3651 if (IS_ERR(full_path))
3652 return PTR_ERR(full_path);
3654 kfree(mnt_ctx->leaf_fullpath);
3655 mnt_ctx->leaf_fullpath = dfs_cache_canonical_path(full_path, cifs_sb->local_nls,
3656 cifs_remap(cifs_sb));
3657 if (IS_ERR(mnt_ctx->leaf_fullpath)) {
3658 rc = PTR_ERR(mnt_ctx->leaf_fullpath);
3659 mnt_ctx->leaf_fullpath = NULL;
3663 /* Get referral from dfs link */
3664 rc = dfs_cache_find(mnt_ctx->xid, mnt_ctx->root_ses, cifs_sb->local_nls,
3665 cifs_remap(cifs_sb), mnt_ctx->leaf_fullpath + 1, NULL, &tl);
3669 /* Try all dfs link targets. If an I/O fails from currently connected DFS target with an
3670 * error other than STATUS_PATH_NOT_COVERED (-EREMOTE), then retry it from other targets as
3671 * specified in MS-DFSC "3.1.5.2 I/O Operation to Target Fails with an Error Other Than
3672 * STATUS_PATH_NOT_COVERED."
3674 for (rc = -ENOENT, tit = dfs_cache_get_tgt_iterator(&tl);
3675 tit; tit = dfs_cache_get_next_tgt(&tl, tit)) {
3676 rc = connect_dfs_target(mnt_ctx, full_path, mnt_ctx->leaf_fullpath + 1, tit);
3678 rc = is_path_remote(mnt_ctx);
3679 if (!rc || rc == -EREMOTE)
3686 dfs_cache_free_tgts(&tl);
3690 static int follow_dfs_link(struct mount_ctx *mnt_ctx)
3693 struct cifs_sb_info *cifs_sb = mnt_ctx->cifs_sb;
3694 struct smb3_fs_context *ctx = mnt_ctx->fs_ctx;
3698 full_path = build_unc_path_to_root(ctx, cifs_sb, true);
3699 if (IS_ERR(full_path))
3700 return PTR_ERR(full_path);
3702 kfree(mnt_ctx->origin_fullpath);
3703 mnt_ctx->origin_fullpath = dfs_cache_canonical_path(full_path, cifs_sb->local_nls,
3704 cifs_remap(cifs_sb));
3707 if (IS_ERR(mnt_ctx->origin_fullpath)) {
3708 rc = PTR_ERR(mnt_ctx->origin_fullpath);
3709 mnt_ctx->origin_fullpath = NULL;
3714 rc = __follow_dfs_link(mnt_ctx);
3715 if (!rc || rc != -EREMOTE)
3717 } while (rc = -ELOOP, ++num_links < MAX_NESTED_LINKS);
3722 /* Set up DFS referral paths for failover */
3723 static void setup_server_referral_paths(struct mount_ctx *mnt_ctx)
3725 struct TCP_Server_Info *server = mnt_ctx->server;
3727 mutex_lock(&server->refpath_lock);
3728 server->origin_fullpath = mnt_ctx->origin_fullpath;
3729 server->leaf_fullpath = mnt_ctx->leaf_fullpath;
3730 server->current_fullpath = mnt_ctx->leaf_fullpath;
3731 mutex_unlock(&server->refpath_lock);
3732 mnt_ctx->origin_fullpath = mnt_ctx->leaf_fullpath = NULL;
3735 int cifs_mount(struct cifs_sb_info *cifs_sb, struct smb3_fs_context *ctx)
3738 struct mount_ctx mnt_ctx = { .cifs_sb = cifs_sb, .fs_ctx = ctx, };
3739 struct dfs_cache_tgt_list tl = DFS_CACHE_TGT_LIST_INIT(tl);
3742 rc = is_dfs_mount(&mnt_ctx, &isdfs, &tl);
3748 /* proceed as DFS mount */
3749 uuid_gen(&mnt_ctx.mount_id);
3750 rc = connect_dfs_root(&mnt_ctx, &tl);
3751 dfs_cache_free_tgts(&tl);
3756 rc = is_path_remote(&mnt_ctx);
3758 rc = follow_dfs_link(&mnt_ctx);
3762 setup_server_referral_paths(&mnt_ctx);
3764 * After reconnecting to a different server, unique ids won't match anymore, so we disable
3765 * serverino. This prevents dentry revalidation to think the dentry are stale (ESTALE).
3767 cifs_autodisable_serverino(cifs_sb);
3769 * Force the use of prefix path to support failover on DFS paths that resolve to targets
3770 * that have different prefix paths.
3772 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_USE_PREFIX_PATH;
3773 kfree(cifs_sb->prepath);
3774 cifs_sb->prepath = ctx->prepath;
3775 ctx->prepath = NULL;
3776 uuid_copy(&cifs_sb->dfs_mount_id, &mnt_ctx.mount_id);
3779 free_xid(mnt_ctx.xid);
3780 cifs_try_adding_channels(cifs_sb, mnt_ctx.ses);
3781 return mount_setup_tlink(cifs_sb, mnt_ctx.ses, mnt_ctx.tcon);
3784 dfs_cache_put_refsrv_sessions(&mnt_ctx.mount_id);
3785 kfree(mnt_ctx.origin_fullpath);
3786 kfree(mnt_ctx.leaf_fullpath);
3787 mount_put_conns(&mnt_ctx);
3791 int cifs_mount(struct cifs_sb_info *cifs_sb, struct smb3_fs_context *ctx)
3794 struct mount_ctx mnt_ctx = { .cifs_sb = cifs_sb, .fs_ctx = ctx, };
3796 rc = mount_get_conns(&mnt_ctx);
3801 rc = is_path_remote(&mnt_ctx);
3808 free_xid(mnt_ctx.xid);
3809 return mount_setup_tlink(cifs_sb, mnt_ctx.ses, mnt_ctx.tcon);
3812 mount_put_conns(&mnt_ctx);
3818 * Issue a TREE_CONNECT request.
3821 CIFSTCon(const unsigned int xid, struct cifs_ses *ses,
3822 const char *tree, struct cifs_tcon *tcon,
3823 const struct nls_table *nls_codepage)
3825 struct smb_hdr *smb_buffer;
3826 struct smb_hdr *smb_buffer_response;
3829 unsigned char *bcc_ptr;
3832 __u16 bytes_left, count;
3837 smb_buffer = cifs_buf_get();
3838 if (smb_buffer == NULL)
3841 smb_buffer_response = smb_buffer;
3843 header_assemble(smb_buffer, SMB_COM_TREE_CONNECT_ANDX,
3844 NULL /*no tid */ , 4 /*wct */ );
3846 smb_buffer->Mid = get_next_mid(ses->server);
3847 smb_buffer->Uid = ses->Suid;
3848 pSMB = (TCONX_REQ *) smb_buffer;
3849 pSMBr = (TCONX_RSP *) smb_buffer_response;
3851 pSMB->AndXCommand = 0xFF;
3852 pSMB->Flags = cpu_to_le16(TCON_EXTENDED_SECINFO);
3853 bcc_ptr = &pSMB->Password[0];
3854 if (tcon->pipe || (ses->server->sec_mode & SECMODE_USER)) {
3855 pSMB->PasswordLength = cpu_to_le16(1); /* minimum */
3856 *bcc_ptr = 0; /* password is null byte */
3857 bcc_ptr++; /* skip password */
3858 /* already aligned so no need to do it below */
3861 if (ses->server->sign)
3862 smb_buffer->Flags2 |= SMBFLG2_SECURITY_SIGNATURE;
3864 if (ses->capabilities & CAP_STATUS32) {
3865 smb_buffer->Flags2 |= SMBFLG2_ERR_STATUS;
3867 if (ses->capabilities & CAP_DFS) {
3868 smb_buffer->Flags2 |= SMBFLG2_DFS;
3870 if (ses->capabilities & CAP_UNICODE) {
3871 smb_buffer->Flags2 |= SMBFLG2_UNICODE;
3873 cifs_strtoUTF16((__le16 *) bcc_ptr, tree,
3874 6 /* max utf8 char length in bytes */ *
3875 (/* server len*/ + 256 /* share len */), nls_codepage);
3876 bcc_ptr += 2 * length; /* convert num 16 bit words to bytes */
3877 bcc_ptr += 2; /* skip trailing null */
3878 } else { /* ASCII */
3879 strcpy(bcc_ptr, tree);
3880 bcc_ptr += strlen(tree) + 1;
3882 strcpy(bcc_ptr, "?????");
3883 bcc_ptr += strlen("?????");
3885 count = bcc_ptr - &pSMB->Password[0];
3886 be32_add_cpu(&pSMB->hdr.smb_buf_length, count);
3887 pSMB->ByteCount = cpu_to_le16(count);
3889 rc = SendReceive(xid, ses, smb_buffer, smb_buffer_response, &length,
3892 /* above now done in SendReceive */
3896 tcon->tid = smb_buffer_response->Tid;
3897 bcc_ptr = pByteArea(smb_buffer_response);
3898 bytes_left = get_bcc(smb_buffer_response);
3899 length = strnlen(bcc_ptr, bytes_left - 2);
3900 if (smb_buffer->Flags2 & SMBFLG2_UNICODE)
3906 /* skip service field (NB: this field is always ASCII) */
3908 if ((bcc_ptr[0] == 'I') && (bcc_ptr[1] == 'P') &&
3909 (bcc_ptr[2] == 'C')) {
3910 cifs_dbg(FYI, "IPC connection\n");
3914 } else if (length == 2) {
3915 if ((bcc_ptr[0] == 'A') && (bcc_ptr[1] == ':')) {
3916 /* the most common case */
3917 cifs_dbg(FYI, "disk share connection\n");
3920 bcc_ptr += length + 1;
3921 bytes_left -= (length + 1);
3922 strlcpy(tcon->treeName, tree, sizeof(tcon->treeName));
3924 /* mostly informational -- no need to fail on error here */
3925 kfree(tcon->nativeFileSystem);
3926 tcon->nativeFileSystem = cifs_strndup_from_utf16(bcc_ptr,
3927 bytes_left, is_unicode,
3930 cifs_dbg(FYI, "nativeFileSystem=%s\n", tcon->nativeFileSystem);
3932 if ((smb_buffer_response->WordCount == 3) ||
3933 (smb_buffer_response->WordCount == 7))
3934 /* field is in same location */
3935 tcon->Flags = le16_to_cpu(pSMBr->OptionalSupport);
3938 cifs_dbg(FYI, "Tcon flags: 0x%x\n", tcon->Flags);
3941 cifs_buf_release(smb_buffer);
3945 static void delayed_free(struct rcu_head *p)
3947 struct cifs_sb_info *cifs_sb = container_of(p, struct cifs_sb_info, rcu);
3949 unload_nls(cifs_sb->local_nls);
3950 smb3_cleanup_fs_context(cifs_sb->ctx);
3955 cifs_umount(struct cifs_sb_info *cifs_sb)
3957 struct rb_root *root = &cifs_sb->tlink_tree;
3958 struct rb_node *node;
3959 struct tcon_link *tlink;
3961 cancel_delayed_work_sync(&cifs_sb->prune_tlinks);
3963 spin_lock(&cifs_sb->tlink_tree_lock);
3964 while ((node = rb_first(root))) {
3965 tlink = rb_entry(node, struct tcon_link, tl_rbnode);
3966 cifs_get_tlink(tlink);
3967 clear_bit(TCON_LINK_IN_TREE, &tlink->tl_flags);
3968 rb_erase(node, root);
3970 spin_unlock(&cifs_sb->tlink_tree_lock);
3971 cifs_put_tlink(tlink);
3972 spin_lock(&cifs_sb->tlink_tree_lock);
3974 spin_unlock(&cifs_sb->tlink_tree_lock);
3976 kfree(cifs_sb->prepath);
3977 #ifdef CONFIG_CIFS_DFS_UPCALL
3978 dfs_cache_put_refsrv_sessions(&cifs_sb->dfs_mount_id);
3980 call_rcu(&cifs_sb->rcu, delayed_free);
3984 cifs_negotiate_protocol(const unsigned int xid, struct cifs_ses *ses,
3985 struct TCP_Server_Info *server)
3989 if (!server->ops->need_neg || !server->ops->negotiate)
3992 /* only send once per connect */
3993 spin_lock(&cifs_tcp_ses_lock);
3994 if (!server->ops->need_neg(server) ||
3995 server->tcpStatus != CifsNeedNegotiate) {
3996 spin_unlock(&cifs_tcp_ses_lock);
3999 server->tcpStatus = CifsInNegotiate;
4000 spin_unlock(&cifs_tcp_ses_lock);
4002 rc = server->ops->negotiate(xid, ses, server);
4004 spin_lock(&cifs_tcp_ses_lock);
4005 if (server->tcpStatus == CifsInNegotiate)
4006 server->tcpStatus = CifsGood;
4009 spin_unlock(&cifs_tcp_ses_lock);
4011 spin_lock(&cifs_tcp_ses_lock);
4012 if (server->tcpStatus == CifsInNegotiate)
4013 server->tcpStatus = CifsNeedNegotiate;
4014 spin_unlock(&cifs_tcp_ses_lock);
4021 cifs_setup_session(const unsigned int xid, struct cifs_ses *ses,
4022 struct TCP_Server_Info *server,
4023 struct nls_table *nls_info)
4026 struct sockaddr_in6 *addr6 = (struct sockaddr_in6 *)&server->dstaddr;
4027 struct sockaddr_in *addr = (struct sockaddr_in *)&server->dstaddr;
4028 bool is_binding = false;
4030 spin_lock(&cifs_tcp_ses_lock);
4031 if (server->dstaddr.ss_family == AF_INET6)
4032 scnprintf(ses->ip_addr, sizeof(ses->ip_addr), "%pI6", &addr6->sin6_addr);
4034 scnprintf(ses->ip_addr, sizeof(ses->ip_addr), "%pI4", &addr->sin_addr);
4036 if (ses->ses_status != SES_GOOD &&
4037 ses->ses_status != SES_NEW &&
4038 ses->ses_status != SES_NEED_RECON) {
4039 spin_unlock(&cifs_tcp_ses_lock);
4043 /* only send once per connect */
4044 spin_lock(&ses->chan_lock);
4045 if (CIFS_ALL_CHANS_GOOD(ses) ||
4046 cifs_chan_in_reconnect(ses, server)) {
4047 spin_unlock(&ses->chan_lock);
4048 spin_unlock(&cifs_tcp_ses_lock);
4051 is_binding = !CIFS_ALL_CHANS_NEED_RECONNECT(ses);
4052 cifs_chan_set_in_reconnect(ses, server);
4053 spin_unlock(&ses->chan_lock);
4056 ses->ses_status = SES_IN_SETUP;
4057 spin_unlock(&cifs_tcp_ses_lock);
4060 ses->capabilities = server->capabilities;
4061 if (!linuxExtEnabled)
4062 ses->capabilities &= (~server->vals->cap_unix);
4064 if (ses->auth_key.response) {
4065 cifs_dbg(FYI, "Free previous auth_key.response = %p\n",
4066 ses->auth_key.response);
4067 kfree(ses->auth_key.response);
4068 ses->auth_key.response = NULL;
4069 ses->auth_key.len = 0;
4073 cifs_dbg(FYI, "Security Mode: 0x%x Capabilities: 0x%x TimeAdjust: %d\n",
4074 server->sec_mode, server->capabilities, server->timeAdj);
4076 if (server->ops->sess_setup)
4077 rc = server->ops->sess_setup(xid, ses, server, nls_info);
4080 cifs_server_dbg(VFS, "Send error in SessSetup = %d\n", rc);
4081 spin_lock(&cifs_tcp_ses_lock);
4082 if (ses->ses_status == SES_IN_SETUP)
4083 ses->ses_status = SES_NEED_RECON;
4084 spin_lock(&ses->chan_lock);
4085 cifs_chan_clear_in_reconnect(ses, server);
4086 spin_unlock(&ses->chan_lock);
4087 spin_unlock(&cifs_tcp_ses_lock);
4089 spin_lock(&cifs_tcp_ses_lock);
4090 if (ses->ses_status == SES_IN_SETUP)
4091 ses->ses_status = SES_GOOD;
4092 spin_lock(&ses->chan_lock);
4093 cifs_chan_clear_in_reconnect(ses, server);
4094 cifs_chan_clear_need_reconnect(ses, server);
4095 spin_unlock(&ses->chan_lock);
4096 spin_unlock(&cifs_tcp_ses_lock);
4103 cifs_set_vol_auth(struct smb3_fs_context *ctx, struct cifs_ses *ses)
4105 ctx->sectype = ses->sectype;
4107 /* krb5 is special, since we don't need username or pw */
4108 if (ctx->sectype == Kerberos)
4111 return cifs_set_cifscreds(ctx, ses);
4114 static struct cifs_tcon *
4115 cifs_construct_tcon(struct cifs_sb_info *cifs_sb, kuid_t fsuid)
4118 struct cifs_tcon *master_tcon = cifs_sb_master_tcon(cifs_sb);
4119 struct cifs_ses *ses;
4120 struct cifs_tcon *tcon = NULL;
4121 struct smb3_fs_context *ctx;
4123 ctx = kzalloc(sizeof(*ctx), GFP_KERNEL);
4125 return ERR_PTR(-ENOMEM);
4127 ctx->local_nls = cifs_sb->local_nls;
4128 ctx->linux_uid = fsuid;
4129 ctx->cred_uid = fsuid;
4130 ctx->UNC = master_tcon->treeName;
4131 ctx->retry = master_tcon->retry;
4132 ctx->nocase = master_tcon->nocase;
4133 ctx->nohandlecache = master_tcon->nohandlecache;
4134 ctx->local_lease = master_tcon->local_lease;
4135 ctx->no_lease = master_tcon->no_lease;
4136 ctx->resilient = master_tcon->use_resilient;
4137 ctx->persistent = master_tcon->use_persistent;
4138 ctx->handle_timeout = master_tcon->handle_timeout;
4139 ctx->no_linux_ext = !master_tcon->unix_ext;
4140 ctx->linux_ext = master_tcon->posix_extensions;
4141 ctx->sectype = master_tcon->ses->sectype;
4142 ctx->sign = master_tcon->ses->sign;
4143 ctx->seal = master_tcon->seal;
4144 ctx->witness = master_tcon->use_witness;
4146 rc = cifs_set_vol_auth(ctx, master_tcon->ses);
4152 /* get a reference for the same TCP session */
4153 spin_lock(&cifs_tcp_ses_lock);
4154 ++master_tcon->ses->server->srv_count;
4155 spin_unlock(&cifs_tcp_ses_lock);
4157 ses = cifs_get_smb_ses(master_tcon->ses->server, ctx);
4159 tcon = (struct cifs_tcon *)ses;
4160 cifs_put_tcp_session(master_tcon->ses->server, 0);
4164 tcon = cifs_get_tcon(ses, ctx);
4166 cifs_put_smb_ses(ses);
4171 reset_cifs_unix_caps(0, tcon, NULL, ctx);
4174 kfree(ctx->username);
4175 kfree_sensitive(ctx->password);
4182 cifs_sb_master_tcon(struct cifs_sb_info *cifs_sb)
4184 return tlink_tcon(cifs_sb_master_tlink(cifs_sb));
4187 /* find and return a tlink with given uid */
4188 static struct tcon_link *
4189 tlink_rb_search(struct rb_root *root, kuid_t uid)
4191 struct rb_node *node = root->rb_node;
4192 struct tcon_link *tlink;
4195 tlink = rb_entry(node, struct tcon_link, tl_rbnode);
4197 if (uid_gt(tlink->tl_uid, uid))
4198 node = node->rb_left;
4199 else if (uid_lt(tlink->tl_uid, uid))
4200 node = node->rb_right;
4207 /* insert a tcon_link into the tree */
4209 tlink_rb_insert(struct rb_root *root, struct tcon_link *new_tlink)
4211 struct rb_node **new = &(root->rb_node), *parent = NULL;
4212 struct tcon_link *tlink;
4215 tlink = rb_entry(*new, struct tcon_link, tl_rbnode);
4218 if (uid_gt(tlink->tl_uid, new_tlink->tl_uid))
4219 new = &((*new)->rb_left);
4221 new = &((*new)->rb_right);
4224 rb_link_node(&new_tlink->tl_rbnode, parent, new);
4225 rb_insert_color(&new_tlink->tl_rbnode, root);
4229 * Find or construct an appropriate tcon given a cifs_sb and the fsuid of the
4232 * If the superblock doesn't refer to a multiuser mount, then just return
4233 * the master tcon for the mount.
4235 * First, search the rbtree for an existing tcon for this fsuid. If one
4236 * exists, then check to see if it's pending construction. If it is then wait
4237 * for construction to complete. Once it's no longer pending, check to see if
4238 * it failed and either return an error or retry construction, depending on
4241 * If one doesn't exist then insert a new tcon_link struct into the tree and
4242 * try to construct a new one.
4245 cifs_sb_tlink(struct cifs_sb_info *cifs_sb)
4248 kuid_t fsuid = current_fsuid();
4249 struct tcon_link *tlink, *newtlink;
4251 if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MULTIUSER))
4252 return cifs_get_tlink(cifs_sb_master_tlink(cifs_sb));
4254 spin_lock(&cifs_sb->tlink_tree_lock);
4255 tlink = tlink_rb_search(&cifs_sb->tlink_tree, fsuid);
4257 cifs_get_tlink(tlink);
4258 spin_unlock(&cifs_sb->tlink_tree_lock);
4260 if (tlink == NULL) {
4261 newtlink = kzalloc(sizeof(*tlink), GFP_KERNEL);
4262 if (newtlink == NULL)
4263 return ERR_PTR(-ENOMEM);
4264 newtlink->tl_uid = fsuid;
4265 newtlink->tl_tcon = ERR_PTR(-EACCES);
4266 set_bit(TCON_LINK_PENDING, &newtlink->tl_flags);
4267 set_bit(TCON_LINK_IN_TREE, &newtlink->tl_flags);
4268 cifs_get_tlink(newtlink);
4270 spin_lock(&cifs_sb->tlink_tree_lock);
4271 /* was one inserted after previous search? */
4272 tlink = tlink_rb_search(&cifs_sb->tlink_tree, fsuid);
4274 cifs_get_tlink(tlink);
4275 spin_unlock(&cifs_sb->tlink_tree_lock);
4277 goto wait_for_construction;
4280 tlink_rb_insert(&cifs_sb->tlink_tree, tlink);
4281 spin_unlock(&cifs_sb->tlink_tree_lock);
4283 wait_for_construction:
4284 ret = wait_on_bit(&tlink->tl_flags, TCON_LINK_PENDING,
4285 TASK_INTERRUPTIBLE);
4287 cifs_put_tlink(tlink);
4288 return ERR_PTR(-ERESTARTSYS);
4291 /* if it's good, return it */
4292 if (!IS_ERR(tlink->tl_tcon))
4295 /* return error if we tried this already recently */
4296 if (time_before(jiffies, tlink->tl_time + TLINK_ERROR_EXPIRE)) {
4297 cifs_put_tlink(tlink);
4298 return ERR_PTR(-EACCES);
4301 if (test_and_set_bit(TCON_LINK_PENDING, &tlink->tl_flags))
4302 goto wait_for_construction;
4305 tlink->tl_tcon = cifs_construct_tcon(cifs_sb, fsuid);
4306 clear_bit(TCON_LINK_PENDING, &tlink->tl_flags);
4307 wake_up_bit(&tlink->tl_flags, TCON_LINK_PENDING);
4309 if (IS_ERR(tlink->tl_tcon)) {
4310 cifs_put_tlink(tlink);
4311 return ERR_PTR(-EACCES);
4318 * periodic workqueue job that scans tcon_tree for a superblock and closes
4322 cifs_prune_tlinks(struct work_struct *work)
4324 struct cifs_sb_info *cifs_sb = container_of(work, struct cifs_sb_info,
4326 struct rb_root *root = &cifs_sb->tlink_tree;
4327 struct rb_node *node;
4328 struct rb_node *tmp;
4329 struct tcon_link *tlink;
4332 * Because we drop the spinlock in the loop in order to put the tlink
4333 * it's not guarded against removal of links from the tree. The only
4334 * places that remove entries from the tree are this function and
4335 * umounts. Because this function is non-reentrant and is canceled
4336 * before umount can proceed, this is safe.
4338 spin_lock(&cifs_sb->tlink_tree_lock);
4339 node = rb_first(root);
4340 while (node != NULL) {
4342 node = rb_next(tmp);
4343 tlink = rb_entry(tmp, struct tcon_link, tl_rbnode);
4345 if (test_bit(TCON_LINK_MASTER, &tlink->tl_flags) ||
4346 atomic_read(&tlink->tl_count) != 0 ||
4347 time_after(tlink->tl_time + TLINK_IDLE_EXPIRE, jiffies))
4350 cifs_get_tlink(tlink);
4351 clear_bit(TCON_LINK_IN_TREE, &tlink->tl_flags);
4352 rb_erase(tmp, root);
4354 spin_unlock(&cifs_sb->tlink_tree_lock);
4355 cifs_put_tlink(tlink);
4356 spin_lock(&cifs_sb->tlink_tree_lock);
4358 spin_unlock(&cifs_sb->tlink_tree_lock);
4360 queue_delayed_work(cifsiod_wq, &cifs_sb->prune_tlinks,
4364 #ifdef CONFIG_CIFS_DFS_UPCALL
4365 /* Update dfs referral path of superblock */
4366 static int update_server_fullpath(struct TCP_Server_Info *server, struct cifs_sb_info *cifs_sb,
4370 size_t len = strlen(target);
4371 char *refpath, *npath;
4373 if (unlikely(len < 2 || *target != '\\'))
4376 if (target[1] == '\\') {
4378 refpath = kmalloc(len, GFP_KERNEL);
4382 scnprintf(refpath, len, "%s", target);
4384 len += sizeof("\\");
4385 refpath = kmalloc(len, GFP_KERNEL);
4389 scnprintf(refpath, len, "\\%s", target);
4392 npath = dfs_cache_canonical_path(refpath, cifs_sb->local_nls, cifs_remap(cifs_sb));
4395 if (IS_ERR(npath)) {
4396 rc = PTR_ERR(npath);
4398 mutex_lock(&server->refpath_lock);
4399 kfree(server->leaf_fullpath);
4400 server->leaf_fullpath = npath;
4401 mutex_unlock(&server->refpath_lock);
4402 server->current_fullpath = server->leaf_fullpath;
4407 static int target_share_matches_server(struct TCP_Server_Info *server, const char *tcp_host,
4408 size_t tcp_host_len, char *share, bool *target_match)
4411 const char *dfs_host;
4412 size_t dfs_host_len;
4414 *target_match = true;
4415 extract_unc_hostname(share, &dfs_host, &dfs_host_len);
4417 /* Check if hostnames or addresses match */
4418 if (dfs_host_len != tcp_host_len || strncasecmp(dfs_host, tcp_host, dfs_host_len) != 0) {
4419 cifs_dbg(FYI, "%s: %.*s doesn't match %.*s\n", __func__, (int)dfs_host_len,
4420 dfs_host, (int)tcp_host_len, tcp_host);
4421 rc = match_target_ip(server, dfs_host, dfs_host_len, target_match);
4423 cifs_dbg(VFS, "%s: failed to match target ip: %d\n", __func__, rc);
4428 static int __tree_connect_dfs_target(const unsigned int xid, struct cifs_tcon *tcon,
4429 struct cifs_sb_info *cifs_sb, char *tree, bool islink,
4430 struct dfs_cache_tgt_list *tl)
4433 struct TCP_Server_Info *server = tcon->ses->server;
4434 const struct smb_version_operations *ops = server->ops;
4435 struct cifs_tcon *ipc = tcon->ses->tcon_ipc;
4436 char *share = NULL, *prefix = NULL;
4437 const char *tcp_host;
4438 size_t tcp_host_len;
4439 struct dfs_cache_tgt_iterator *tit;
4442 extract_unc_hostname(server->hostname, &tcp_host, &tcp_host_len);
4444 tit = dfs_cache_get_tgt_iterator(tl);
4450 /* Try to tree connect to all dfs targets */
4451 for (; tit; tit = dfs_cache_get_next_tgt(tl, tit)) {
4452 const char *target = dfs_cache_get_tgt_name(tit);
4453 struct dfs_cache_tgt_list ntl = DFS_CACHE_TGT_LIST_INIT(ntl);
4457 share = prefix = NULL;
4459 /* Check if share matches with tcp ses */
4460 rc = dfs_cache_get_tgt_share(server->current_fullpath + 1, tit, &share, &prefix);
4462 cifs_dbg(VFS, "%s: failed to parse target share: %d\n", __func__, rc);
4466 rc = target_share_matches_server(server, tcp_host, tcp_host_len, share,
4470 if (!target_match) {
4475 if (ipc->need_reconnect) {
4476 scnprintf(tree, MAX_TREE_SIZE, "\\\\%s\\IPC$", server->hostname);
4477 rc = ops->tree_connect(xid, ipc->ses, tree, ipc, cifs_sb->local_nls);
4482 scnprintf(tree, MAX_TREE_SIZE, "\\%s", share);
4484 rc = ops->tree_connect(xid, tcon->ses, tree, tcon, cifs_sb->local_nls);
4488 * If no dfs referrals were returned from link target, then just do a TREE_CONNECT
4489 * to it. Otherwise, cache the dfs referral and then mark current tcp ses for
4490 * reconnect so either the demultiplex thread or the echo worker will reconnect to
4491 * newly resolved target.
4493 if (dfs_cache_find(xid, tcon->ses, cifs_sb->local_nls, cifs_remap(cifs_sb), target,
4495 rc = ops->tree_connect(xid, tcon->ses, tree, tcon, cifs_sb->local_nls);
4498 rc = dfs_cache_noreq_update_tgthint(server->current_fullpath + 1, tit);
4500 rc = cifs_update_super_prepath(cifs_sb, prefix);
4502 /* Target is another dfs share */
4503 rc = update_server_fullpath(server, cifs_sb, target);
4504 dfs_cache_free_tgts(tl);
4508 list_replace_init(&ntl.tl_list, &tl->tl_list);
4510 dfs_cache_free_tgts(&ntl);
4522 static int tree_connect_dfs_target(const unsigned int xid, struct cifs_tcon *tcon,
4523 struct cifs_sb_info *cifs_sb, char *tree, bool islink,
4524 struct dfs_cache_tgt_list *tl)
4528 struct TCP_Server_Info *server = tcon->ses->server;
4531 rc = __tree_connect_dfs_target(xid, tcon, cifs_sb, tree, islink, tl);
4532 if (!rc || rc != -EREMOTE)
4534 } while (rc = -ELOOP, ++num_links < MAX_NESTED_LINKS);
4536 * If we couldn't tree connect to any targets from last referral path, then retry from
4537 * original referral path.
4539 if (rc && server->current_fullpath != server->origin_fullpath) {
4540 server->current_fullpath = server->origin_fullpath;
4541 cifs_signal_cifsd_for_reconnect(server, true);
4544 dfs_cache_free_tgts(tl);
4548 int cifs_tree_connect(const unsigned int xid, struct cifs_tcon *tcon, const struct nls_table *nlsc)
4551 struct TCP_Server_Info *server = tcon->ses->server;
4552 const struct smb_version_operations *ops = server->ops;
4553 struct super_block *sb = NULL;
4554 struct cifs_sb_info *cifs_sb;
4555 struct dfs_cache_tgt_list tl = DFS_CACHE_TGT_LIST_INIT(tl);
4557 struct dfs_info3_param ref = {0};
4559 /* only send once per connect */
4560 spin_lock(&cifs_tcp_ses_lock);
4561 if (tcon->ses->ses_status != SES_GOOD ||
4562 (tcon->status != TID_NEW &&
4563 tcon->status != TID_NEED_TCON)) {
4564 spin_unlock(&cifs_tcp_ses_lock);
4567 tcon->status = TID_IN_TCON;
4568 spin_unlock(&cifs_tcp_ses_lock);
4570 tree = kzalloc(MAX_TREE_SIZE, GFP_KERNEL);
4577 scnprintf(tree, MAX_TREE_SIZE, "\\\\%s\\IPC$", server->hostname);
4578 rc = ops->tree_connect(xid, tcon->ses, tree, tcon, nlsc);
4582 sb = cifs_get_tcp_super(server);
4585 cifs_dbg(VFS, "%s: could not find superblock: %d\n", __func__, rc);
4589 cifs_sb = CIFS_SB(sb);
4591 /* If it is not dfs or there was no cached dfs referral, then reconnect to same share */
4592 if (!server->current_fullpath ||
4593 dfs_cache_noreq_find(server->current_fullpath + 1, &ref, &tl)) {
4594 rc = ops->tree_connect(xid, tcon->ses, tcon->treeName, tcon, cifs_sb->local_nls);
4598 rc = tree_connect_dfs_target(xid, tcon, cifs_sb, tree, ref.server_type == DFS_TYPE_LINK,
4600 free_dfs_info_param(&ref);
4604 cifs_put_tcp_super(sb);
4607 spin_lock(&cifs_tcp_ses_lock);
4608 if (tcon->status == TID_IN_TCON)
4609 tcon->status = TID_NEED_TCON;
4610 spin_unlock(&cifs_tcp_ses_lock);
4612 spin_lock(&cifs_tcp_ses_lock);
4613 if (tcon->status == TID_IN_TCON)
4614 tcon->status = TID_GOOD;
4615 spin_unlock(&cifs_tcp_ses_lock);
4616 tcon->need_reconnect = false;
4622 int cifs_tree_connect(const unsigned int xid, struct cifs_tcon *tcon, const struct nls_table *nlsc)
4625 const struct smb_version_operations *ops = tcon->ses->server->ops;
4627 /* only send once per connect */
4628 spin_lock(&cifs_tcp_ses_lock);
4629 if (tcon->ses->ses_status != SES_GOOD ||
4630 (tcon->status != TID_NEW &&
4631 tcon->status != TID_NEED_TCON)) {
4632 spin_unlock(&cifs_tcp_ses_lock);
4635 tcon->status = TID_IN_TCON;
4636 spin_unlock(&cifs_tcp_ses_lock);
4638 rc = ops->tree_connect(xid, tcon->ses, tcon->treeName, tcon, nlsc);
4640 spin_lock(&cifs_tcp_ses_lock);
4641 if (tcon->status == TID_IN_TCON)
4642 tcon->status = TID_NEED_TCON;
4643 spin_unlock(&cifs_tcp_ses_lock);
4645 spin_lock(&cifs_tcp_ses_lock);
4646 if (tcon->status == TID_IN_TCON)
4647 tcon->status = TID_GOOD;
4648 spin_unlock(&cifs_tcp_ses_lock);
4649 tcon->need_reconnect = false;