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(&server->srv_lock);
123 rc = cifs_convert_address((struct sockaddr *)&server->dstaddr, ipaddr,
125 spin_unlock(&server->srv_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(&pserver->srv_lock);
210 pserver->tcpStatus = CifsNeedReconnect;
211 spin_unlock(&pserver->srv_lock);
214 spin_unlock(&pserver->srv_lock);
216 spin_lock(&cifs_tcp_ses_lock);
217 list_for_each_entry(ses, &pserver->smb_ses_list, smb_ses_list) {
218 spin_lock(&ses->chan_lock);
219 for (i = 0; i < ses->chan_count; i++) {
220 spin_lock(&ses->chans[i].server->srv_lock);
221 ses->chans[i].server->tcpStatus = CifsNeedReconnect;
222 spin_unlock(&ses->chans[i].server->srv_lock);
224 spin_unlock(&ses->chan_lock);
226 spin_unlock(&cifs_tcp_ses_lock);
230 * Mark all sessions and tcons for reconnect.
231 * IMPORTANT: make sure that this gets called only from
232 * cifsd thread. For any other thread, use
233 * cifs_signal_cifsd_for_reconnect
235 * @server: the tcp ses for which reconnect is needed
236 * @server needs to be previously set to CifsNeedReconnect.
237 * @mark_smb_session: whether even sessions need to be marked
240 cifs_mark_tcp_ses_conns_for_reconnect(struct TCP_Server_Info *server,
241 bool mark_smb_session)
243 struct TCP_Server_Info *pserver;
244 struct cifs_ses *ses, *nses;
245 struct cifs_tcon *tcon;
248 * before reconnecting the tcp session, mark the smb session (uid) and the tid bad so they
249 * are not used until reconnected.
251 cifs_dbg(FYI, "%s: marking necessary sessions and tcons for reconnect\n", __func__);
253 /* If server is a channel, select the primary channel */
254 pserver = CIFS_SERVER_IS_CHAN(server) ? server->primary_server : server;
257 spin_lock(&cifs_tcp_ses_lock);
258 list_for_each_entry_safe(ses, nses, &pserver->smb_ses_list, smb_ses_list) {
259 /* check if iface is still active */
260 if (!cifs_chan_is_iface_active(ses, server))
261 cifs_chan_update_iface(ses, server);
263 spin_lock(&ses->chan_lock);
264 if (!mark_smb_session && cifs_chan_needs_reconnect(ses, server))
267 if (mark_smb_session)
268 CIFS_SET_ALL_CHANS_NEED_RECONNECT(ses);
270 cifs_chan_set_need_reconnect(ses, server);
272 /* If all channels need reconnect, then tcon needs reconnect */
273 if (!mark_smb_session && !CIFS_ALL_CHANS_NEED_RECONNECT(ses))
276 ses->ses_status = SES_NEED_RECON;
278 list_for_each_entry(tcon, &ses->tcon_list, tcon_list) {
279 tcon->need_reconnect = true;
280 tcon->status = TID_NEED_RECON;
283 ses->tcon_ipc->need_reconnect = true;
286 spin_unlock(&ses->chan_lock);
288 spin_unlock(&cifs_tcp_ses_lock);
292 cifs_abort_connection(struct TCP_Server_Info *server)
294 struct mid_q_entry *mid, *nmid;
295 struct list_head retry_list;
298 server->max_read = 0;
300 /* do not want to be sending data on a socket we are freeing */
301 cifs_dbg(FYI, "%s: tearing down socket\n", __func__);
302 cifs_server_lock(server);
303 if (server->ssocket) {
304 cifs_dbg(FYI, "State: 0x%x Flags: 0x%lx\n", server->ssocket->state,
305 server->ssocket->flags);
306 kernel_sock_shutdown(server->ssocket, SHUT_WR);
307 cifs_dbg(FYI, "Post shutdown state: 0x%x Flags: 0x%lx\n", server->ssocket->state,
308 server->ssocket->flags);
309 sock_release(server->ssocket);
310 server->ssocket = NULL;
312 server->sequence_number = 0;
313 server->session_estab = false;
314 kfree(server->session_key.response);
315 server->session_key.response = NULL;
316 server->session_key.len = 0;
317 server->lstrp = jiffies;
319 /* mark submitted MIDs for retry and issue callback */
320 INIT_LIST_HEAD(&retry_list);
321 cifs_dbg(FYI, "%s: moving mids to private list\n", __func__);
322 spin_lock(&server->mid_lock);
323 list_for_each_entry_safe(mid, nmid, &server->pending_mid_q, qhead) {
324 kref_get(&mid->refcount);
325 if (mid->mid_state == MID_REQUEST_SUBMITTED)
326 mid->mid_state = MID_RETRY_NEEDED;
327 list_move(&mid->qhead, &retry_list);
328 mid->mid_flags |= MID_DELETED;
330 spin_unlock(&server->mid_lock);
331 cifs_server_unlock(server);
333 cifs_dbg(FYI, "%s: issuing mid callbacks\n", __func__);
334 list_for_each_entry_safe(mid, nmid, &retry_list, qhead) {
335 list_del_init(&mid->qhead);
340 if (cifs_rdma_enabled(server)) {
341 cifs_server_lock(server);
342 smbd_destroy(server);
343 cifs_server_unlock(server);
347 static bool cifs_tcp_ses_needs_reconnect(struct TCP_Server_Info *server, int num_targets)
349 spin_lock(&server->srv_lock);
350 server->nr_targets = num_targets;
351 if (server->tcpStatus == CifsExiting) {
352 /* the demux thread will exit normally next time through the loop */
353 spin_unlock(&server->srv_lock);
354 wake_up(&server->response_q);
358 cifs_dbg(FYI, "Mark tcp session as need reconnect\n");
359 trace_smb3_reconnect(server->CurrentMid, server->conn_id,
361 server->tcpStatus = CifsNeedReconnect;
363 spin_unlock(&server->srv_lock);
368 * cifs tcp session reconnection
370 * mark tcp session as reconnecting so temporarily locked
371 * mark all smb sessions as reconnecting for tcp session
372 * reconnect tcp session
373 * wake up waiters on reconnection? - (not needed currently)
375 * if mark_smb_session is passed as true, unconditionally mark
376 * the smb session (and tcon) for reconnect as well. This value
377 * doesn't really matter for non-multichannel scenario.
380 static int __cifs_reconnect(struct TCP_Server_Info *server,
381 bool mark_smb_session)
385 if (!cifs_tcp_ses_needs_reconnect(server, 1))
388 cifs_mark_tcp_ses_conns_for_reconnect(server, mark_smb_session);
390 cifs_abort_connection(server);
394 cifs_server_lock(server);
396 if (!cifs_swn_set_server_dstaddr(server)) {
397 /* resolve the hostname again to make sure that IP address is up-to-date */
398 rc = reconn_set_ipaddr_from_hostname(server);
399 cifs_dbg(FYI, "%s: reconn_set_ipaddr_from_hostname: rc=%d\n", __func__, rc);
402 if (cifs_rdma_enabled(server))
403 rc = smbd_reconnect(server);
405 rc = generic_ip_connect(server);
407 cifs_server_unlock(server);
408 cifs_dbg(FYI, "%s: reconnect error %d\n", __func__, rc);
411 atomic_inc(&tcpSesReconnectCount);
412 set_credits(server, 1);
413 spin_lock(&server->srv_lock);
414 if (server->tcpStatus != CifsExiting)
415 server->tcpStatus = CifsNeedNegotiate;
416 spin_unlock(&server->srv_lock);
417 cifs_swn_reset_server_dstaddr(server);
418 cifs_server_unlock(server);
419 mod_delayed_work(cifsiod_wq, &server->reconnect, 0);
421 } while (server->tcpStatus == CifsNeedReconnect);
423 spin_lock(&server->srv_lock);
424 if (server->tcpStatus == CifsNeedNegotiate)
425 mod_delayed_work(cifsiod_wq, &server->echo, 0);
426 spin_unlock(&server->srv_lock);
428 wake_up(&server->response_q);
432 #ifdef CONFIG_CIFS_DFS_UPCALL
433 static int __reconnect_target_unlocked(struct TCP_Server_Info *server, const char *target)
438 if (!cifs_swn_set_server_dstaddr(server)) {
439 if (server->hostname != target) {
440 hostname = extract_hostname(target);
441 if (!IS_ERR(hostname)) {
442 kfree(server->hostname);
443 server->hostname = hostname;
445 cifs_dbg(FYI, "%s: couldn't extract hostname or address from dfs target: %ld\n",
446 __func__, PTR_ERR(hostname));
447 cifs_dbg(FYI, "%s: default to last target server: %s\n", __func__,
451 /* resolve the hostname again to make sure that IP address is up-to-date. */
452 rc = reconn_set_ipaddr_from_hostname(server);
453 cifs_dbg(FYI, "%s: reconn_set_ipaddr_from_hostname: rc=%d\n", __func__, rc);
455 /* Reconnect the socket */
456 if (cifs_rdma_enabled(server))
457 rc = smbd_reconnect(server);
459 rc = generic_ip_connect(server);
464 static int reconnect_target_unlocked(struct TCP_Server_Info *server, struct dfs_cache_tgt_list *tl,
465 struct dfs_cache_tgt_iterator **target_hint)
468 struct dfs_cache_tgt_iterator *tit;
472 /* If dfs target list is empty, then reconnect to last server */
473 tit = dfs_cache_get_tgt_iterator(tl);
475 return __reconnect_target_unlocked(server, server->hostname);
477 /* Otherwise, try every dfs target in @tl */
478 for (; tit; tit = dfs_cache_get_next_tgt(tl, tit)) {
479 rc = __reconnect_target_unlocked(server, dfs_cache_get_tgt_name(tit));
488 static int reconnect_dfs_server(struct TCP_Server_Info *server)
491 const char *refpath = server->current_fullpath + 1;
492 struct dfs_cache_tgt_list tl = DFS_CACHE_TGT_LIST_INIT(tl);
493 struct dfs_cache_tgt_iterator *target_hint = NULL;
497 * Determine the number of dfs targets the referral path in @cifs_sb resolves to.
499 * smb2_reconnect() needs to know how long it should wait based upon the number of dfs
500 * targets (server->nr_targets). It's also possible that the cached referral was cleared
501 * through /proc/fs/cifs/dfscache or the target list is empty due to server settings after
502 * refreshing the referral, so, in this case, default it to 1.
504 if (!dfs_cache_noreq_find(refpath, NULL, &tl))
505 num_targets = dfs_cache_get_nr_tgts(&tl);
509 if (!cifs_tcp_ses_needs_reconnect(server, num_targets))
513 * Unconditionally mark all sessions & tcons for reconnect as we might be connecting to a
514 * different server or share during failover. It could be improved by adding some logic to
515 * only do that in case it connects to a different server or share, though.
517 cifs_mark_tcp_ses_conns_for_reconnect(server, true);
519 cifs_abort_connection(server);
523 cifs_server_lock(server);
525 rc = reconnect_target_unlocked(server, &tl, &target_hint);
527 /* Failed to reconnect socket */
528 cifs_server_unlock(server);
529 cifs_dbg(FYI, "%s: reconnect error %d\n", __func__, rc);
534 * Socket was created. Update tcp session status to CifsNeedNegotiate so that a
535 * process waiting for reconnect will know it needs to re-establish session and tcon
536 * through the reconnected target server.
538 atomic_inc(&tcpSesReconnectCount);
539 set_credits(server, 1);
540 spin_lock(&server->srv_lock);
541 if (server->tcpStatus != CifsExiting)
542 server->tcpStatus = CifsNeedNegotiate;
543 spin_unlock(&server->srv_lock);
544 cifs_swn_reset_server_dstaddr(server);
545 cifs_server_unlock(server);
546 mod_delayed_work(cifsiod_wq, &server->reconnect, 0);
547 } while (server->tcpStatus == CifsNeedReconnect);
550 dfs_cache_noreq_update_tgthint(refpath, target_hint);
552 dfs_cache_free_tgts(&tl);
554 /* Need to set up echo worker again once connection has been established */
555 spin_lock(&server->srv_lock);
556 if (server->tcpStatus == CifsNeedNegotiate)
557 mod_delayed_work(cifsiod_wq, &server->echo, 0);
558 spin_unlock(&server->srv_lock);
560 wake_up(&server->response_q);
564 int cifs_reconnect(struct TCP_Server_Info *server, bool mark_smb_session)
566 /* If tcp session is not an dfs connection, then reconnect to last target server */
567 spin_lock(&server->srv_lock);
568 if (!server->is_dfs_conn) {
569 spin_unlock(&server->srv_lock);
570 return __cifs_reconnect(server, mark_smb_session);
572 spin_unlock(&server->srv_lock);
574 mutex_lock(&server->refpath_lock);
575 if (!server->origin_fullpath || !server->leaf_fullpath) {
576 mutex_unlock(&server->refpath_lock);
577 return __cifs_reconnect(server, mark_smb_session);
579 mutex_unlock(&server->refpath_lock);
581 return reconnect_dfs_server(server);
584 int cifs_reconnect(struct TCP_Server_Info *server, bool mark_smb_session)
586 return __cifs_reconnect(server, mark_smb_session);
591 cifs_echo_request(struct work_struct *work)
594 struct TCP_Server_Info *server = container_of(work,
595 struct TCP_Server_Info, echo.work);
598 * We cannot send an echo if it is disabled.
599 * Also, no need to ping if we got a response recently.
602 if (server->tcpStatus == CifsNeedReconnect ||
603 server->tcpStatus == CifsExiting ||
604 server->tcpStatus == CifsNew ||
605 (server->ops->can_echo && !server->ops->can_echo(server)) ||
606 time_before(jiffies, server->lstrp + server->echo_interval - HZ))
609 rc = server->ops->echo ? server->ops->echo(server) : -ENOSYS;
611 cifs_dbg(FYI, "Unable to send echo request to server: %s\n",
614 /* Check witness registrations */
618 queue_delayed_work(cifsiod_wq, &server->echo, server->echo_interval);
622 allocate_buffers(struct TCP_Server_Info *server)
624 if (!server->bigbuf) {
625 server->bigbuf = (char *)cifs_buf_get();
626 if (!server->bigbuf) {
627 cifs_server_dbg(VFS, "No memory for large SMB response\n");
629 /* retry will check if exiting */
632 } else if (server->large_buf) {
633 /* we are reusing a dirty large buf, clear its start */
634 memset(server->bigbuf, 0, HEADER_SIZE(server));
637 if (!server->smallbuf) {
638 server->smallbuf = (char *)cifs_small_buf_get();
639 if (!server->smallbuf) {
640 cifs_server_dbg(VFS, "No memory for SMB response\n");
642 /* retry will check if exiting */
645 /* beginning of smb buffer is cleared in our buf_get */
647 /* if existing small buf clear beginning */
648 memset(server->smallbuf, 0, HEADER_SIZE(server));
655 server_unresponsive(struct TCP_Server_Info *server)
658 * We need to wait 3 echo intervals to make sure we handle such
660 * 1s client sends a normal SMB request
661 * 2s client gets a response
662 * 30s echo workqueue job pops, and decides we got a response recently
663 * and don't need to send another
665 * 65s kernel_recvmsg times out, and we see that we haven't gotten
666 * a response in >60s.
668 spin_lock(&server->srv_lock);
669 if ((server->tcpStatus == CifsGood ||
670 server->tcpStatus == CifsNeedNegotiate) &&
671 (!server->ops->can_echo || server->ops->can_echo(server)) &&
672 time_after(jiffies, server->lstrp + 3 * server->echo_interval)) {
673 spin_unlock(&server->srv_lock);
674 cifs_server_dbg(VFS, "has not responded in %lu seconds. Reconnecting...\n",
675 (3 * server->echo_interval) / HZ);
676 cifs_reconnect(server, false);
679 spin_unlock(&server->srv_lock);
685 zero_credits(struct TCP_Server_Info *server)
689 spin_lock(&server->req_lock);
690 val = server->credits + server->echo_credits + server->oplock_credits;
691 if (server->in_flight == 0 && val == 0) {
692 spin_unlock(&server->req_lock);
695 spin_unlock(&server->req_lock);
700 cifs_readv_from_socket(struct TCP_Server_Info *server, struct msghdr *smb_msg)
705 smb_msg->msg_control = NULL;
706 smb_msg->msg_controllen = 0;
708 for (total_read = 0; msg_data_left(smb_msg); total_read += length) {
711 /* reconnect if no credits and no requests in flight */
712 if (zero_credits(server)) {
713 cifs_reconnect(server, false);
714 return -ECONNABORTED;
717 if (server_unresponsive(server))
718 return -ECONNABORTED;
719 if (cifs_rdma_enabled(server) && server->smbd_conn)
720 length = smbd_recv(server->smbd_conn, smb_msg);
722 length = sock_recvmsg(server->ssocket, smb_msg, 0);
724 spin_lock(&server->srv_lock);
725 if (server->tcpStatus == CifsExiting) {
726 spin_unlock(&server->srv_lock);
730 if (server->tcpStatus == CifsNeedReconnect) {
731 spin_unlock(&server->srv_lock);
732 cifs_reconnect(server, false);
733 return -ECONNABORTED;
735 spin_unlock(&server->srv_lock);
737 if (length == -ERESTARTSYS ||
741 * Minimum sleep to prevent looping, allowing socket
742 * to clear and app threads to set tcpStatus
743 * CifsNeedReconnect if server hung.
745 usleep_range(1000, 2000);
751 cifs_dbg(FYI, "Received no data or error: %d\n", length);
752 cifs_reconnect(server, false);
753 return -ECONNABORTED;
760 cifs_read_from_socket(struct TCP_Server_Info *server, char *buf,
761 unsigned int to_read)
763 struct msghdr smb_msg;
764 struct kvec iov = {.iov_base = buf, .iov_len = to_read};
765 iov_iter_kvec(&smb_msg.msg_iter, READ, &iov, 1, to_read);
767 return cifs_readv_from_socket(server, &smb_msg);
771 cifs_discard_from_socket(struct TCP_Server_Info *server, size_t to_read)
773 struct msghdr smb_msg;
776 * iov_iter_discard already sets smb_msg.type and count and iov_offset
777 * and cifs_readv_from_socket sets msg_control and msg_controllen
778 * so little to initialize in struct msghdr
780 smb_msg.msg_name = NULL;
781 smb_msg.msg_namelen = 0;
782 iov_iter_discard(&smb_msg.msg_iter, READ, to_read);
784 return cifs_readv_from_socket(server, &smb_msg);
788 cifs_read_page_from_socket(struct TCP_Server_Info *server, struct page *page,
789 unsigned int page_offset, unsigned int to_read)
791 struct msghdr smb_msg;
792 struct bio_vec bv = {
793 .bv_page = page, .bv_len = to_read, .bv_offset = page_offset};
794 iov_iter_bvec(&smb_msg.msg_iter, READ, &bv, 1, to_read);
795 return cifs_readv_from_socket(server, &smb_msg);
799 is_smb_response(struct TCP_Server_Info *server, unsigned char type)
802 * The first byte big endian of the length field,
803 * is actually not part of the length but the type
804 * with the most common, zero, as regular data.
807 case RFC1002_SESSION_MESSAGE:
808 /* Regular SMB response */
810 case RFC1002_SESSION_KEEP_ALIVE:
811 cifs_dbg(FYI, "RFC 1002 session keep alive\n");
813 case RFC1002_POSITIVE_SESSION_RESPONSE:
814 cifs_dbg(FYI, "RFC 1002 positive session response\n");
816 case RFC1002_NEGATIVE_SESSION_RESPONSE:
818 * We get this from Windows 98 instead of an error on
819 * SMB negprot response.
821 cifs_dbg(FYI, "RFC 1002 negative session response\n");
822 /* give server a second to clean up */
825 * Always try 445 first on reconnect since we get NACK
826 * on some if we ever connected to port 139 (the NACK
827 * is since we do not begin with RFC1001 session
830 cifs_set_port((struct sockaddr *)&server->dstaddr, CIFS_PORT);
831 cifs_reconnect(server, true);
834 cifs_server_dbg(VFS, "RFC 1002 unknown response type 0x%x\n", type);
835 cifs_reconnect(server, true);
842 dequeue_mid(struct mid_q_entry *mid, bool malformed)
844 #ifdef CONFIG_CIFS_STATS2
845 mid->when_received = jiffies;
847 spin_lock(&mid->server->mid_lock);
849 mid->mid_state = MID_RESPONSE_RECEIVED;
851 mid->mid_state = MID_RESPONSE_MALFORMED;
853 * Trying to handle/dequeue a mid after the send_recv()
854 * function has finished processing it is a bug.
856 if (mid->mid_flags & MID_DELETED) {
857 spin_unlock(&mid->server->mid_lock);
858 pr_warn_once("trying to dequeue a deleted mid\n");
860 list_del_init(&mid->qhead);
861 mid->mid_flags |= MID_DELETED;
862 spin_unlock(&mid->server->mid_lock);
867 smb2_get_credits_from_hdr(char *buffer, struct TCP_Server_Info *server)
869 struct smb2_hdr *shdr = (struct smb2_hdr *)buffer;
872 * SMB1 does not use credits.
874 if (server->vals->header_preamble_size)
877 return le16_to_cpu(shdr->CreditRequest);
881 handle_mid(struct mid_q_entry *mid, struct TCP_Server_Info *server,
882 char *buf, int malformed)
884 if (server->ops->check_trans2 &&
885 server->ops->check_trans2(mid, server, buf, malformed))
887 mid->credits_received = smb2_get_credits_from_hdr(buf, server);
889 mid->large_buf = server->large_buf;
890 /* Was previous buf put in mpx struct for multi-rsp? */
891 if (!mid->multiRsp) {
892 /* smb buffer will be freed by user thread */
893 if (server->large_buf)
894 server->bigbuf = NULL;
896 server->smallbuf = NULL;
898 dequeue_mid(mid, malformed);
902 cifs_enable_signing(struct TCP_Server_Info *server, bool mnt_sign_required)
904 bool srv_sign_required = server->sec_mode & server->vals->signing_required;
905 bool srv_sign_enabled = server->sec_mode & server->vals->signing_enabled;
906 bool mnt_sign_enabled;
909 * Is signing required by mnt options? If not then check
910 * global_secflags to see if it is there.
912 if (!mnt_sign_required)
913 mnt_sign_required = ((global_secflags & CIFSSEC_MUST_SIGN) ==
917 * If signing is required then it's automatically enabled too,
918 * otherwise, check to see if the secflags allow it.
920 mnt_sign_enabled = mnt_sign_required ? mnt_sign_required :
921 (global_secflags & CIFSSEC_MAY_SIGN);
923 /* If server requires signing, does client allow it? */
924 if (srv_sign_required) {
925 if (!mnt_sign_enabled) {
926 cifs_dbg(VFS, "Server requires signing, but it's disabled in SecurityFlags!\n");
932 /* If client requires signing, does server allow it? */
933 if (mnt_sign_required) {
934 if (!srv_sign_enabled) {
935 cifs_dbg(VFS, "Server does not support signing!\n");
941 if (cifs_rdma_enabled(server) && server->sign)
942 cifs_dbg(VFS, "Signing is enabled, and RDMA read/write will be disabled\n");
948 static void clean_demultiplex_info(struct TCP_Server_Info *server)
952 /* take it off the list, if it's not already */
953 spin_lock(&server->srv_lock);
954 list_del_init(&server->tcp_ses_list);
955 spin_unlock(&server->srv_lock);
957 cancel_delayed_work_sync(&server->echo);
958 cancel_delayed_work_sync(&server->resolve);
960 spin_lock(&server->srv_lock);
961 server->tcpStatus = CifsExiting;
962 spin_unlock(&server->srv_lock);
963 wake_up_all(&server->response_q);
965 /* check if we have blocked requests that need to free */
966 spin_lock(&server->req_lock);
967 if (server->credits <= 0)
969 spin_unlock(&server->req_lock);
971 * Although there should not be any requests blocked on this queue it
972 * can not hurt to be paranoid and try to wake up requests that may
973 * haven been blocked when more than 50 at time were on the wire to the
974 * same server - they now will see the session is in exit state and get
975 * out of SendReceive.
977 wake_up_all(&server->request_q);
978 /* give those requests time to exit */
980 if (cifs_rdma_enabled(server))
981 smbd_destroy(server);
982 if (server->ssocket) {
983 sock_release(server->ssocket);
984 server->ssocket = NULL;
987 if (!list_empty(&server->pending_mid_q)) {
988 struct list_head dispose_list;
989 struct mid_q_entry *mid_entry;
990 struct list_head *tmp, *tmp2;
992 INIT_LIST_HEAD(&dispose_list);
993 spin_lock(&server->mid_lock);
994 list_for_each_safe(tmp, tmp2, &server->pending_mid_q) {
995 mid_entry = list_entry(tmp, struct mid_q_entry, qhead);
996 cifs_dbg(FYI, "Clearing mid %llu\n", mid_entry->mid);
997 kref_get(&mid_entry->refcount);
998 mid_entry->mid_state = MID_SHUTDOWN;
999 list_move(&mid_entry->qhead, &dispose_list);
1000 mid_entry->mid_flags |= MID_DELETED;
1002 spin_unlock(&server->mid_lock);
1004 /* now walk dispose list and issue callbacks */
1005 list_for_each_safe(tmp, tmp2, &dispose_list) {
1006 mid_entry = list_entry(tmp, struct mid_q_entry, qhead);
1007 cifs_dbg(FYI, "Callback mid %llu\n", mid_entry->mid);
1008 list_del_init(&mid_entry->qhead);
1009 mid_entry->callback(mid_entry);
1010 release_mid(mid_entry);
1012 /* 1/8th of sec is more than enough time for them to exit */
1016 if (!list_empty(&server->pending_mid_q)) {
1018 * mpx threads have not exited yet give them at least the smb
1019 * send timeout time for long ops.
1021 * Due to delays on oplock break requests, we need to wait at
1022 * least 45 seconds before giving up on a request getting a
1023 * response and going ahead and killing cifsd.
1025 cifs_dbg(FYI, "Wait for exit from demultiplex thread\n");
1028 * If threads still have not exited they are probably never
1029 * coming home not much else we can do but free the memory.
1033 #ifdef CONFIG_CIFS_DFS_UPCALL
1034 kfree(server->origin_fullpath);
1035 kfree(server->leaf_fullpath);
1039 length = atomic_dec_return(&tcpSesAllocCount);
1041 mempool_resize(cifs_req_poolp, length + cifs_min_rcv);
1045 standard_receive3(struct TCP_Server_Info *server, struct mid_q_entry *mid)
1048 char *buf = server->smallbuf;
1049 unsigned int pdu_length = server->pdu_size;
1051 /* make sure this will fit in a large buffer */
1052 if (pdu_length > CIFSMaxBufSize + MAX_HEADER_SIZE(server) -
1053 server->vals->header_preamble_size) {
1054 cifs_server_dbg(VFS, "SMB response too long (%u bytes)\n", pdu_length);
1055 cifs_reconnect(server, true);
1056 return -ECONNABORTED;
1059 /* switch to large buffer if too big for a small one */
1060 if (pdu_length > MAX_CIFS_SMALL_BUFFER_SIZE - 4) {
1061 server->large_buf = true;
1062 memcpy(server->bigbuf, buf, server->total_read);
1063 buf = server->bigbuf;
1066 /* now read the rest */
1067 length = cifs_read_from_socket(server, buf + HEADER_SIZE(server) - 1,
1068 pdu_length - HEADER_SIZE(server) + 1
1069 + server->vals->header_preamble_size);
1073 server->total_read += length;
1075 dump_smb(buf, server->total_read);
1077 return cifs_handle_standard(server, mid);
1081 cifs_handle_standard(struct TCP_Server_Info *server, struct mid_q_entry *mid)
1083 char *buf = server->large_buf ? server->bigbuf : server->smallbuf;
1087 * We know that we received enough to get to the MID as we
1088 * checked the pdu_length earlier. Now check to see
1089 * if the rest of the header is OK.
1091 * 48 bytes is enough to display the header and a little bit
1092 * into the payload for debugging purposes.
1094 rc = server->ops->check_message(buf, server->total_read, server);
1096 cifs_dump_mem("Bad SMB: ", buf,
1097 min_t(unsigned int, server->total_read, 48));
1099 if (server->ops->is_session_expired &&
1100 server->ops->is_session_expired(buf)) {
1101 cifs_reconnect(server, true);
1105 if (server->ops->is_status_pending &&
1106 server->ops->is_status_pending(buf, server))
1112 handle_mid(mid, server, buf, rc);
1117 smb2_add_credits_from_hdr(char *buffer, struct TCP_Server_Info *server)
1119 struct smb2_hdr *shdr = (struct smb2_hdr *)buffer;
1120 int scredits, in_flight;
1123 * SMB1 does not use credits.
1125 if (server->vals->header_preamble_size)
1128 if (shdr->CreditRequest) {
1129 spin_lock(&server->req_lock);
1130 server->credits += le16_to_cpu(shdr->CreditRequest);
1131 scredits = server->credits;
1132 in_flight = server->in_flight;
1133 spin_unlock(&server->req_lock);
1134 wake_up(&server->request_q);
1136 trace_smb3_hdr_credits(server->CurrentMid,
1137 server->conn_id, server->hostname, scredits,
1138 le16_to_cpu(shdr->CreditRequest), in_flight);
1139 cifs_server_dbg(FYI, "%s: added %u credits total=%d\n",
1140 __func__, le16_to_cpu(shdr->CreditRequest),
1147 cifs_demultiplex_thread(void *p)
1149 int i, num_mids, length;
1150 struct TCP_Server_Info *server = p;
1151 unsigned int pdu_length;
1152 unsigned int next_offset;
1154 struct task_struct *task_to_wake = NULL;
1155 struct mid_q_entry *mids[MAX_COMPOUND];
1156 char *bufs[MAX_COMPOUND];
1157 unsigned int noreclaim_flag, num_io_timeout = 0;
1159 noreclaim_flag = memalloc_noreclaim_save();
1160 cifs_dbg(FYI, "Demultiplex PID: %d\n", task_pid_nr(current));
1162 length = atomic_inc_return(&tcpSesAllocCount);
1164 mempool_resize(cifs_req_poolp, length + cifs_min_rcv);
1167 allow_kernel_signal(SIGKILL);
1168 while (server->tcpStatus != CifsExiting) {
1169 if (try_to_freeze())
1172 if (!allocate_buffers(server))
1175 server->large_buf = false;
1176 buf = server->smallbuf;
1177 pdu_length = 4; /* enough to get RFC1001 header */
1179 length = cifs_read_from_socket(server, buf, pdu_length);
1183 if (server->vals->header_preamble_size == 0)
1184 server->total_read = 0;
1186 server->total_read = length;
1189 * The right amount was read from socket - 4 bytes,
1190 * so we can now interpret the length field.
1192 pdu_length = get_rfc1002_length(buf);
1194 cifs_dbg(FYI, "RFC1002 header 0x%x\n", pdu_length);
1195 if (!is_smb_response(server, buf[0]))
1198 server->pdu_size = pdu_length;
1200 /* make sure we have enough to get to the MID */
1201 if (server->pdu_size < HEADER_SIZE(server) - 1 -
1202 server->vals->header_preamble_size) {
1203 cifs_server_dbg(VFS, "SMB response too short (%u bytes)\n",
1205 cifs_reconnect(server, true);
1209 /* read down to the MID */
1210 length = cifs_read_from_socket(server,
1211 buf + server->vals->header_preamble_size,
1212 HEADER_SIZE(server) - 1
1213 - server->vals->header_preamble_size);
1216 server->total_read += length;
1218 if (server->ops->next_header) {
1219 next_offset = server->ops->next_header(buf);
1221 server->pdu_size = next_offset;
1224 memset(mids, 0, sizeof(mids));
1225 memset(bufs, 0, sizeof(bufs));
1228 if (server->ops->is_transform_hdr &&
1229 server->ops->receive_transform &&
1230 server->ops->is_transform_hdr(buf)) {
1231 length = server->ops->receive_transform(server,
1236 mids[0] = server->ops->find_mid(server, buf);
1240 if (!mids[0] || !mids[0]->receive)
1241 length = standard_receive3(server, mids[0]);
1243 length = mids[0]->receive(server, mids[0]);
1247 for (i = 0; i < num_mids; i++)
1249 release_mid(mids[i]);
1253 if (server->ops->is_status_io_timeout &&
1254 server->ops->is_status_io_timeout(buf)) {
1256 if (num_io_timeout > NUM_STATUS_IO_TIMEOUT) {
1257 cifs_reconnect(server, false);
1263 server->lstrp = jiffies;
1265 for (i = 0; i < num_mids; i++) {
1266 if (mids[i] != NULL) {
1267 mids[i]->resp_buf_size = server->pdu_size;
1269 if (bufs[i] && server->ops->is_network_name_deleted)
1270 server->ops->is_network_name_deleted(bufs[i],
1273 if (!mids[i]->multiRsp || mids[i]->multiEnd)
1274 mids[i]->callback(mids[i]);
1276 release_mid(mids[i]);
1277 } else if (server->ops->is_oplock_break &&
1278 server->ops->is_oplock_break(bufs[i],
1280 smb2_add_credits_from_hdr(bufs[i], server);
1281 cifs_dbg(FYI, "Received oplock break\n");
1283 cifs_server_dbg(VFS, "No task to wake, unknown frame received! NumMids %d\n",
1284 atomic_read(&mid_count));
1285 cifs_dump_mem("Received Data is: ", bufs[i],
1286 HEADER_SIZE(server));
1287 smb2_add_credits_from_hdr(bufs[i], server);
1288 #ifdef CONFIG_CIFS_DEBUG2
1289 if (server->ops->dump_detail)
1290 server->ops->dump_detail(bufs[i],
1292 cifs_dump_mids(server);
1293 #endif /* CIFS_DEBUG2 */
1297 if (pdu_length > server->pdu_size) {
1298 if (!allocate_buffers(server))
1300 pdu_length -= server->pdu_size;
1301 server->total_read = 0;
1302 server->large_buf = false;
1303 buf = server->smallbuf;
1306 } /* end while !EXITING */
1308 /* buffer usually freed in free_mid - need to free it here on exit */
1309 cifs_buf_release(server->bigbuf);
1310 if (server->smallbuf) /* no sense logging a debug message if NULL */
1311 cifs_small_buf_release(server->smallbuf);
1313 task_to_wake = xchg(&server->tsk, NULL);
1314 clean_demultiplex_info(server);
1316 /* if server->tsk was NULL then wait for a signal before exiting */
1317 if (!task_to_wake) {
1318 set_current_state(TASK_INTERRUPTIBLE);
1319 while (!signal_pending(current)) {
1321 set_current_state(TASK_INTERRUPTIBLE);
1323 set_current_state(TASK_RUNNING);
1326 memalloc_noreclaim_restore(noreclaim_flag);
1327 module_put_and_kthread_exit(0);
1331 * Returns true if srcaddr isn't specified and rhs isn't specified, or
1332 * if srcaddr is specified and matches the IP address of the rhs argument
1335 cifs_match_ipaddr(struct sockaddr *srcaddr, struct sockaddr *rhs)
1337 switch (srcaddr->sa_family) {
1339 return (rhs->sa_family == AF_UNSPEC);
1341 struct sockaddr_in *saddr4 = (struct sockaddr_in *)srcaddr;
1342 struct sockaddr_in *vaddr4 = (struct sockaddr_in *)rhs;
1343 return (saddr4->sin_addr.s_addr == vaddr4->sin_addr.s_addr);
1346 struct sockaddr_in6 *saddr6 = (struct sockaddr_in6 *)srcaddr;
1347 struct sockaddr_in6 *vaddr6 = (struct sockaddr_in6 *)rhs;
1348 return ipv6_addr_equal(&saddr6->sin6_addr, &vaddr6->sin6_addr);
1352 return false; /* don't expect to be here */
1357 * If no port is specified in addr structure, we try to match with 445 port
1358 * and if it fails - with 139 ports. It should be called only if address
1359 * families of server and addr are equal.
1362 match_port(struct TCP_Server_Info *server, struct sockaddr *addr)
1364 __be16 port, *sport;
1366 /* SMBDirect manages its own ports, don't match it here */
1370 switch (addr->sa_family) {
1372 sport = &((struct sockaddr_in *) &server->dstaddr)->sin_port;
1373 port = ((struct sockaddr_in *) addr)->sin_port;
1376 sport = &((struct sockaddr_in6 *) &server->dstaddr)->sin6_port;
1377 port = ((struct sockaddr_in6 *) addr)->sin6_port;
1385 port = htons(CIFS_PORT);
1389 port = htons(RFC1001_PORT);
1392 return port == *sport;
1396 match_address(struct TCP_Server_Info *server, struct sockaddr *addr,
1397 struct sockaddr *srcaddr)
1399 switch (addr->sa_family) {
1401 struct sockaddr_in *addr4 = (struct sockaddr_in *)addr;
1402 struct sockaddr_in *srv_addr4 =
1403 (struct sockaddr_in *)&server->dstaddr;
1405 if (addr4->sin_addr.s_addr != srv_addr4->sin_addr.s_addr)
1410 struct sockaddr_in6 *addr6 = (struct sockaddr_in6 *)addr;
1411 struct sockaddr_in6 *srv_addr6 =
1412 (struct sockaddr_in6 *)&server->dstaddr;
1414 if (!ipv6_addr_equal(&addr6->sin6_addr,
1415 &srv_addr6->sin6_addr))
1417 if (addr6->sin6_scope_id != srv_addr6->sin6_scope_id)
1423 return false; /* don't expect to be here */
1426 if (!cifs_match_ipaddr(srcaddr, (struct sockaddr *)&server->srcaddr))
1433 match_security(struct TCP_Server_Info *server, struct smb3_fs_context *ctx)
1436 * The select_sectype function should either return the ctx->sectype
1437 * that was specified, or "Unspecified" if that sectype was not
1438 * compatible with the given NEGOTIATE request.
1440 if (server->ops->select_sectype(server, ctx->sectype)
1445 * Now check if signing mode is acceptable. No need to check
1446 * global_secflags at this point since if MUST_SIGN is set then
1447 * the server->sign had better be too.
1449 if (ctx->sign && !server->sign)
1455 /* this function must be called with srv_lock held */
1456 static int match_server(struct TCP_Server_Info *server, struct smb3_fs_context *ctx)
1458 struct sockaddr *addr = (struct sockaddr *)&ctx->dstaddr;
1460 if (ctx->nosharesock)
1463 /* this server does not share socket */
1464 if (server->nosharesock)
1467 /* If multidialect negotiation see if existing sessions match one */
1468 if (strcmp(ctx->vals->version_string, SMB3ANY_VERSION_STRING) == 0) {
1469 if (server->vals->protocol_id < SMB30_PROT_ID)
1471 } else if (strcmp(ctx->vals->version_string,
1472 SMBDEFAULT_VERSION_STRING) == 0) {
1473 if (server->vals->protocol_id < SMB21_PROT_ID)
1475 } else if ((server->vals != ctx->vals) || (server->ops != ctx->ops))
1478 if (!net_eq(cifs_net_ns(server), current->nsproxy->net_ns))
1481 if (strcasecmp(server->hostname, ctx->server_hostname))
1484 if (!match_address(server, addr,
1485 (struct sockaddr *)&ctx->srcaddr))
1488 if (!match_port(server, addr))
1491 if (!match_security(server, ctx))
1494 if (server->echo_interval != ctx->echo_interval * HZ)
1497 if (server->rdma != ctx->rdma)
1500 if (server->ignore_signature != ctx->ignore_signature)
1503 if (server->min_offload != ctx->min_offload)
1509 struct TCP_Server_Info *
1510 cifs_find_tcp_session(struct smb3_fs_context *ctx)
1512 struct TCP_Server_Info *server;
1514 spin_lock(&cifs_tcp_ses_lock);
1515 list_for_each_entry(server, &cifs_tcp_ses_list, tcp_ses_list) {
1516 spin_lock(&server->srv_lock);
1517 #ifdef CONFIG_CIFS_DFS_UPCALL
1519 * DFS failover implementation in cifs_reconnect() requires unique tcp sessions for
1520 * DFS connections to do failover properly, so avoid sharing them with regular
1521 * shares or even links that may connect to same server but having completely
1522 * different failover targets.
1524 if (server->is_dfs_conn) {
1525 spin_unlock(&server->srv_lock);
1530 * Skip ses channels since they're only handled in lower layers
1531 * (e.g. cifs_send_recv).
1533 if (CIFS_SERVER_IS_CHAN(server) || !match_server(server, ctx)) {
1534 spin_unlock(&server->srv_lock);
1537 spin_unlock(&server->srv_lock);
1539 ++server->srv_count;
1540 spin_unlock(&cifs_tcp_ses_lock);
1541 cifs_dbg(FYI, "Existing tcp session with server found\n");
1544 spin_unlock(&cifs_tcp_ses_lock);
1549 cifs_put_tcp_session(struct TCP_Server_Info *server, int from_reconnect)
1551 struct task_struct *task;
1553 spin_lock(&cifs_tcp_ses_lock);
1554 if (--server->srv_count > 0) {
1555 spin_unlock(&cifs_tcp_ses_lock);
1559 /* srv_count can never go negative */
1560 WARN_ON(server->srv_count < 0);
1562 put_net(cifs_net_ns(server));
1564 list_del_init(&server->tcp_ses_list);
1565 spin_unlock(&cifs_tcp_ses_lock);
1567 /* For secondary channels, we pick up ref-count on the primary server */
1568 if (CIFS_SERVER_IS_CHAN(server))
1569 cifs_put_tcp_session(server->primary_server, from_reconnect);
1571 cancel_delayed_work_sync(&server->echo);
1572 cancel_delayed_work_sync(&server->resolve);
1576 * Avoid deadlock here: reconnect work calls
1577 * cifs_put_tcp_session() at its end. Need to be sure
1578 * that reconnect work does nothing with server pointer after
1581 cancel_delayed_work(&server->reconnect);
1583 cancel_delayed_work_sync(&server->reconnect);
1585 spin_lock(&server->srv_lock);
1586 server->tcpStatus = CifsExiting;
1587 spin_unlock(&server->srv_lock);
1589 cifs_crypto_secmech_release(server);
1591 kfree(server->session_key.response);
1592 server->session_key.response = NULL;
1593 server->session_key.len = 0;
1594 kfree(server->hostname);
1596 task = xchg(&server->tsk, NULL);
1598 send_sig(SIGKILL, task, 1);
1601 struct TCP_Server_Info *
1602 cifs_get_tcp_session(struct smb3_fs_context *ctx,
1603 struct TCP_Server_Info *primary_server)
1605 struct TCP_Server_Info *tcp_ses = NULL;
1608 cifs_dbg(FYI, "UNC: %s\n", ctx->UNC);
1610 /* see if we already have a matching tcp_ses */
1611 tcp_ses = cifs_find_tcp_session(ctx);
1615 tcp_ses = kzalloc(sizeof(struct TCP_Server_Info), GFP_KERNEL);
1621 tcp_ses->hostname = kstrdup(ctx->server_hostname, GFP_KERNEL);
1622 if (!tcp_ses->hostname) {
1627 if (ctx->nosharesock)
1628 tcp_ses->nosharesock = true;
1630 tcp_ses->ops = ctx->ops;
1631 tcp_ses->vals = ctx->vals;
1632 cifs_set_net_ns(tcp_ses, get_net(current->nsproxy->net_ns));
1634 tcp_ses->conn_id = atomic_inc_return(&tcpSesNextId);
1635 tcp_ses->noblockcnt = ctx->rootfs;
1636 tcp_ses->noblocksnd = ctx->noblocksnd || ctx->rootfs;
1637 tcp_ses->noautotune = ctx->noautotune;
1638 tcp_ses->tcp_nodelay = ctx->sockopt_tcp_nodelay;
1639 tcp_ses->rdma = ctx->rdma;
1640 tcp_ses->in_flight = 0;
1641 tcp_ses->max_in_flight = 0;
1642 tcp_ses->credits = 1;
1643 if (primary_server) {
1644 spin_lock(&cifs_tcp_ses_lock);
1645 ++primary_server->srv_count;
1646 spin_unlock(&cifs_tcp_ses_lock);
1647 tcp_ses->primary_server = primary_server;
1649 init_waitqueue_head(&tcp_ses->response_q);
1650 init_waitqueue_head(&tcp_ses->request_q);
1651 INIT_LIST_HEAD(&tcp_ses->pending_mid_q);
1652 mutex_init(&tcp_ses->_srv_mutex);
1653 memcpy(tcp_ses->workstation_RFC1001_name,
1654 ctx->source_rfc1001_name, RFC1001_NAME_LEN_WITH_NULL);
1655 memcpy(tcp_ses->server_RFC1001_name,
1656 ctx->target_rfc1001_name, RFC1001_NAME_LEN_WITH_NULL);
1657 tcp_ses->session_estab = false;
1658 tcp_ses->sequence_number = 0;
1659 tcp_ses->reconnect_instance = 1;
1660 tcp_ses->lstrp = jiffies;
1661 tcp_ses->compress_algorithm = cpu_to_le16(ctx->compression);
1662 spin_lock_init(&tcp_ses->req_lock);
1663 spin_lock_init(&tcp_ses->srv_lock);
1664 spin_lock_init(&tcp_ses->mid_lock);
1665 INIT_LIST_HEAD(&tcp_ses->tcp_ses_list);
1666 INIT_LIST_HEAD(&tcp_ses->smb_ses_list);
1667 INIT_DELAYED_WORK(&tcp_ses->echo, cifs_echo_request);
1668 INIT_DELAYED_WORK(&tcp_ses->resolve, cifs_resolve_server);
1669 INIT_DELAYED_WORK(&tcp_ses->reconnect, smb2_reconnect_server);
1670 mutex_init(&tcp_ses->reconnect_mutex);
1671 #ifdef CONFIG_CIFS_DFS_UPCALL
1672 mutex_init(&tcp_ses->refpath_lock);
1674 memcpy(&tcp_ses->srcaddr, &ctx->srcaddr,
1675 sizeof(tcp_ses->srcaddr));
1676 memcpy(&tcp_ses->dstaddr, &ctx->dstaddr,
1677 sizeof(tcp_ses->dstaddr));
1678 if (ctx->use_client_guid)
1679 memcpy(tcp_ses->client_guid, ctx->client_guid,
1680 SMB2_CLIENT_GUID_SIZE);
1682 generate_random_uuid(tcp_ses->client_guid);
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 init of tcpStatus or srv_count
1688 tcp_ses->tcpStatus = CifsNew;
1689 ++tcp_ses->srv_count;
1691 if (ctx->echo_interval >= SMB_ECHO_INTERVAL_MIN &&
1692 ctx->echo_interval <= SMB_ECHO_INTERVAL_MAX)
1693 tcp_ses->echo_interval = ctx->echo_interval * HZ;
1695 tcp_ses->echo_interval = SMB_ECHO_INTERVAL_DEFAULT * HZ;
1696 if (tcp_ses->rdma) {
1697 #ifndef CONFIG_CIFS_SMB_DIRECT
1698 cifs_dbg(VFS, "CONFIG_CIFS_SMB_DIRECT is not enabled\n");
1700 goto out_err_crypto_release;
1702 tcp_ses->smbd_conn = smbd_get_connection(
1703 tcp_ses, (struct sockaddr *)&ctx->dstaddr);
1704 if (tcp_ses->smbd_conn) {
1705 cifs_dbg(VFS, "RDMA transport established\n");
1707 goto smbd_connected;
1710 goto out_err_crypto_release;
1713 rc = ip_connect(tcp_ses);
1715 cifs_dbg(VFS, "Error connecting to socket. Aborting operation.\n");
1716 goto out_err_crypto_release;
1720 * since we're in a cifs function already, we know that
1721 * this will succeed. No need for try_module_get().
1723 __module_get(THIS_MODULE);
1724 tcp_ses->tsk = kthread_run(cifs_demultiplex_thread,
1726 if (IS_ERR(tcp_ses->tsk)) {
1727 rc = PTR_ERR(tcp_ses->tsk);
1728 cifs_dbg(VFS, "error %d create cifsd thread\n", rc);
1729 module_put(THIS_MODULE);
1730 goto out_err_crypto_release;
1732 tcp_ses->min_offload = ctx->min_offload;
1734 * at this point we are the only ones with the pointer
1735 * to the struct since the kernel thread not created yet
1736 * no need to spinlock this update of tcpStatus
1738 spin_lock(&tcp_ses->srv_lock);
1739 tcp_ses->tcpStatus = CifsNeedNegotiate;
1740 spin_unlock(&tcp_ses->srv_lock);
1742 if ((ctx->max_credits < 20) || (ctx->max_credits > 60000))
1743 tcp_ses->max_credits = SMB2_MAX_CREDITS_AVAILABLE;
1745 tcp_ses->max_credits = ctx->max_credits;
1747 tcp_ses->nr_targets = 1;
1748 tcp_ses->ignore_signature = ctx->ignore_signature;
1749 /* thread spawned, put it on the list */
1750 spin_lock(&cifs_tcp_ses_lock);
1751 list_add(&tcp_ses->tcp_ses_list, &cifs_tcp_ses_list);
1752 spin_unlock(&cifs_tcp_ses_lock);
1754 /* queue echo request delayed work */
1755 queue_delayed_work(cifsiod_wq, &tcp_ses->echo, tcp_ses->echo_interval);
1757 /* queue dns resolution delayed work */
1758 cifs_dbg(FYI, "%s: next dns resolution scheduled for %d seconds in the future\n",
1759 __func__, SMB_DNS_RESOLVE_INTERVAL_DEFAULT);
1761 queue_delayed_work(cifsiod_wq, &tcp_ses->resolve, (SMB_DNS_RESOLVE_INTERVAL_DEFAULT * HZ));
1765 out_err_crypto_release:
1766 cifs_crypto_secmech_release(tcp_ses);
1768 put_net(cifs_net_ns(tcp_ses));
1772 if (CIFS_SERVER_IS_CHAN(tcp_ses))
1773 cifs_put_tcp_session(tcp_ses->primary_server, false);
1774 kfree(tcp_ses->hostname);
1775 if (tcp_ses->ssocket)
1776 sock_release(tcp_ses->ssocket);
1782 /* this function must be called with ses_lock held */
1783 static int match_session(struct cifs_ses *ses, struct smb3_fs_context *ctx)
1785 if (ctx->sectype != Unspecified &&
1786 ctx->sectype != ses->sectype)
1790 * If an existing session is limited to less channels than
1791 * requested, it should not be reused
1793 spin_lock(&ses->chan_lock);
1794 if (ses->chan_max < ctx->max_channels) {
1795 spin_unlock(&ses->chan_lock);
1798 spin_unlock(&ses->chan_lock);
1800 switch (ses->sectype) {
1802 if (!uid_eq(ctx->cred_uid, ses->cred_uid))
1806 /* NULL username means anonymous session */
1807 if (ses->user_name == NULL) {
1813 /* anything else takes username/password */
1814 if (strncmp(ses->user_name,
1815 ctx->username ? ctx->username : "",
1816 CIFS_MAX_USERNAME_LEN))
1818 if ((ctx->username && strlen(ctx->username) != 0) &&
1819 ses->password != NULL &&
1820 strncmp(ses->password,
1821 ctx->password ? ctx->password : "",
1822 CIFS_MAX_PASSWORD_LEN))
1829 * cifs_setup_ipc - helper to setup the IPC tcon for the session
1830 * @ses: smb session to issue the request on
1831 * @ctx: the superblock configuration context to use for building the
1832 * new tree connection for the IPC (interprocess communication RPC)
1834 * A new IPC connection is made and stored in the session
1835 * tcon_ipc. The IPC tcon has the same lifetime as the session.
1838 cifs_setup_ipc(struct cifs_ses *ses, struct smb3_fs_context *ctx)
1841 struct cifs_tcon *tcon;
1842 char unc[SERVER_NAME_LENGTH + sizeof("//x/IPC$")] = {0};
1844 struct TCP_Server_Info *server = ses->server;
1847 * If the mount request that resulted in the creation of the
1848 * session requires encryption, force IPC to be encrypted too.
1851 if (server->capabilities & SMB2_GLOBAL_CAP_ENCRYPTION)
1854 cifs_server_dbg(VFS,
1855 "IPC: server doesn't support encryption\n");
1860 tcon = tconInfoAlloc();
1864 scnprintf(unc, sizeof(unc), "\\\\%s\\IPC$", server->hostname);
1870 rc = server->ops->tree_connect(xid, ses, unc, tcon, ctx->local_nls);
1874 cifs_server_dbg(VFS, "failed to connect to IPC (rc=%d)\n", rc);
1879 cifs_dbg(FYI, "IPC tcon rc=%d ipc tid=0x%x\n", rc, tcon->tid);
1881 ses->tcon_ipc = tcon;
1887 * cifs_free_ipc - helper to release the session IPC tcon
1888 * @ses: smb session to unmount the IPC from
1890 * Needs to be called everytime a session is destroyed.
1892 * On session close, the IPC is closed and the server must release all tcons of the session.
1893 * No need to send a tree disconnect here.
1895 * Besides, it will make the server to not close durable and resilient files on session close, as
1896 * specified in MS-SMB2 3.3.5.6 Receiving an SMB2 LOGOFF Request.
1899 cifs_free_ipc(struct cifs_ses *ses)
1901 struct cifs_tcon *tcon = ses->tcon_ipc;
1907 ses->tcon_ipc = NULL;
1911 static struct cifs_ses *
1912 cifs_find_smb_ses(struct TCP_Server_Info *server, struct smb3_fs_context *ctx)
1914 struct cifs_ses *ses;
1916 spin_lock(&cifs_tcp_ses_lock);
1917 list_for_each_entry(ses, &server->smb_ses_list, smb_ses_list) {
1918 spin_lock(&ses->ses_lock);
1919 if (ses->ses_status == SES_EXITING) {
1920 spin_unlock(&ses->ses_lock);
1923 if (!match_session(ses, ctx)) {
1924 spin_unlock(&ses->ses_lock);
1927 spin_unlock(&ses->ses_lock);
1930 spin_unlock(&cifs_tcp_ses_lock);
1933 spin_unlock(&cifs_tcp_ses_lock);
1937 void cifs_put_smb_ses(struct cifs_ses *ses)
1939 unsigned int rc, xid;
1940 unsigned int chan_count;
1941 struct TCP_Server_Info *server = ses->server;
1943 spin_lock(&ses->ses_lock);
1944 if (ses->ses_status == SES_EXITING) {
1945 spin_unlock(&ses->ses_lock);
1948 spin_unlock(&ses->ses_lock);
1950 cifs_dbg(FYI, "%s: ses_count=%d\n", __func__, ses->ses_count);
1951 cifs_dbg(FYI, "%s: ses ipc: %s\n", __func__, ses->tcon_ipc ? ses->tcon_ipc->treeName : "NONE");
1953 spin_lock(&cifs_tcp_ses_lock);
1954 if (--ses->ses_count > 0) {
1955 spin_unlock(&cifs_tcp_ses_lock);
1958 spin_unlock(&cifs_tcp_ses_lock);
1960 /* ses_count can never go negative */
1961 WARN_ON(ses->ses_count < 0);
1963 if (ses->ses_status == SES_GOOD)
1964 ses->ses_status = SES_EXITING;
1968 if (ses->ses_status == SES_EXITING && server->ops->logoff) {
1970 rc = server->ops->logoff(xid, ses);
1972 cifs_server_dbg(VFS, "%s: Session Logoff failure rc=%d\n",
1977 spin_lock(&cifs_tcp_ses_lock);
1978 list_del_init(&ses->smb_ses_list);
1979 spin_unlock(&cifs_tcp_ses_lock);
1981 chan_count = ses->chan_count;
1983 /* close any extra channels */
1984 if (chan_count > 1) {
1987 for (i = 1; i < chan_count; i++) {
1988 if (ses->chans[i].iface) {
1989 kref_put(&ses->chans[i].iface->refcount, release_iface);
1990 ses->chans[i].iface = NULL;
1992 cifs_put_tcp_session(ses->chans[i].server, 0);
1993 ses->chans[i].server = NULL;
1998 cifs_put_tcp_session(server, 0);
2003 /* strlen("cifs:a:") + CIFS_MAX_DOMAINNAME_LEN + 1 */
2004 #define CIFSCREDS_DESC_SIZE (7 + CIFS_MAX_DOMAINNAME_LEN + 1)
2006 /* Populate username and pw fields from keyring if possible */
2008 cifs_set_cifscreds(struct smb3_fs_context *ctx, struct cifs_ses *ses)
2012 const char *delim, *payload;
2016 struct TCP_Server_Info *server = ses->server;
2017 struct sockaddr_in *sa;
2018 struct sockaddr_in6 *sa6;
2019 const struct user_key_payload *upayload;
2021 desc = kmalloc(CIFSCREDS_DESC_SIZE, GFP_KERNEL);
2025 /* try to find an address key first */
2026 switch (server->dstaddr.ss_family) {
2028 sa = (struct sockaddr_in *)&server->dstaddr;
2029 sprintf(desc, "cifs:a:%pI4", &sa->sin_addr.s_addr);
2032 sa6 = (struct sockaddr_in6 *)&server->dstaddr;
2033 sprintf(desc, "cifs:a:%pI6c", &sa6->sin6_addr.s6_addr);
2036 cifs_dbg(FYI, "Bad ss_family (%hu)\n",
2037 server->dstaddr.ss_family);
2042 cifs_dbg(FYI, "%s: desc=%s\n", __func__, desc);
2043 key = request_key(&key_type_logon, desc, "");
2045 if (!ses->domainName) {
2046 cifs_dbg(FYI, "domainName is NULL\n");
2051 /* didn't work, try to find a domain key */
2052 sprintf(desc, "cifs:d:%s", ses->domainName);
2053 cifs_dbg(FYI, "%s: desc=%s\n", __func__, desc);
2054 key = request_key(&key_type_logon, desc, "");
2062 down_read(&key->sem);
2063 upayload = user_key_payload_locked(key);
2064 if (IS_ERR_OR_NULL(upayload)) {
2065 rc = upayload ? PTR_ERR(upayload) : -EINVAL;
2069 /* find first : in payload */
2070 payload = upayload->data;
2071 delim = strnchr(payload, upayload->datalen, ':');
2072 cifs_dbg(FYI, "payload=%s\n", payload);
2074 cifs_dbg(FYI, "Unable to find ':' in payload (datalen=%d)\n",
2080 len = delim - payload;
2081 if (len > CIFS_MAX_USERNAME_LEN || len <= 0) {
2082 cifs_dbg(FYI, "Bad value from username search (len=%zd)\n",
2088 ctx->username = kstrndup(payload, len, GFP_KERNEL);
2089 if (!ctx->username) {
2090 cifs_dbg(FYI, "Unable to allocate %zd bytes for username\n",
2095 cifs_dbg(FYI, "%s: username=%s\n", __func__, ctx->username);
2097 len = key->datalen - (len + 1);
2098 if (len > CIFS_MAX_PASSWORD_LEN || len <= 0) {
2099 cifs_dbg(FYI, "Bad len for password search (len=%zd)\n", len);
2101 kfree(ctx->username);
2102 ctx->username = NULL;
2107 ctx->password = kstrndup(delim, len, GFP_KERNEL);
2108 if (!ctx->password) {
2109 cifs_dbg(FYI, "Unable to allocate %zd bytes for password\n",
2112 kfree(ctx->username);
2113 ctx->username = NULL;
2118 * If we have a domain key then we must set the domainName in the
2121 if (is_domain && ses->domainName) {
2122 ctx->domainname = kstrdup(ses->domainName, GFP_KERNEL);
2123 if (!ctx->domainname) {
2124 cifs_dbg(FYI, "Unable to allocate %zd bytes for domain\n",
2127 kfree(ctx->username);
2128 ctx->username = NULL;
2129 kfree_sensitive(ctx->password);
2130 ctx->password = NULL;
2135 strscpy(ctx->workstation_name, ses->workstation_name, sizeof(ctx->workstation_name));
2142 cifs_dbg(FYI, "%s: returning %d\n", __func__, rc);
2145 #else /* ! CONFIG_KEYS */
2147 cifs_set_cifscreds(struct smb3_fs_context *ctx __attribute__((unused)),
2148 struct cifs_ses *ses __attribute__((unused)))
2152 #endif /* CONFIG_KEYS */
2155 * cifs_get_smb_ses - get a session matching @ctx data from @server
2156 * @server: server to setup the session to
2157 * @ctx: superblock configuration context to use to setup the session
2159 * This function assumes it is being called from cifs_mount() where we
2160 * already got a server reference (server refcount +1). See
2161 * cifs_get_tcon() for refcount explanations.
2164 cifs_get_smb_ses(struct TCP_Server_Info *server, struct smb3_fs_context *ctx)
2168 struct cifs_ses *ses;
2169 struct sockaddr_in *addr = (struct sockaddr_in *)&server->dstaddr;
2170 struct sockaddr_in6 *addr6 = (struct sockaddr_in6 *)&server->dstaddr;
2174 ses = cifs_find_smb_ses(server, ctx);
2176 cifs_dbg(FYI, "Existing smb sess found (status=%d)\n",
2179 spin_lock(&ses->chan_lock);
2180 if (cifs_chan_needs_reconnect(ses, server)) {
2181 spin_unlock(&ses->chan_lock);
2182 cifs_dbg(FYI, "Session needs reconnect\n");
2184 mutex_lock(&ses->session_mutex);
2185 rc = cifs_negotiate_protocol(xid, ses, server);
2187 mutex_unlock(&ses->session_mutex);
2188 /* problem -- put our ses reference */
2189 cifs_put_smb_ses(ses);
2194 rc = cifs_setup_session(xid, ses, server,
2197 mutex_unlock(&ses->session_mutex);
2198 /* problem -- put our reference */
2199 cifs_put_smb_ses(ses);
2203 mutex_unlock(&ses->session_mutex);
2205 spin_lock(&ses->chan_lock);
2207 spin_unlock(&ses->chan_lock);
2209 /* existing SMB ses has a server reference already */
2210 cifs_put_tcp_session(server, 0);
2215 cifs_dbg(FYI, "Existing smb sess not found\n");
2216 ses = sesInfoAlloc();
2220 /* new SMB session uses our server ref */
2221 ses->server = server;
2222 if (server->dstaddr.ss_family == AF_INET6)
2223 sprintf(ses->ip_addr, "%pI6", &addr6->sin6_addr);
2225 sprintf(ses->ip_addr, "%pI4", &addr->sin_addr);
2227 if (ctx->username) {
2228 ses->user_name = kstrdup(ctx->username, GFP_KERNEL);
2229 if (!ses->user_name)
2233 /* ctx->password freed at unmount */
2234 if (ctx->password) {
2235 ses->password = kstrdup(ctx->password, GFP_KERNEL);
2239 if (ctx->domainname) {
2240 ses->domainName = kstrdup(ctx->domainname, GFP_KERNEL);
2241 if (!ses->domainName)
2245 strscpy(ses->workstation_name, ctx->workstation_name, sizeof(ses->workstation_name));
2247 if (ctx->domainauto)
2248 ses->domainAuto = ctx->domainauto;
2249 ses->cred_uid = ctx->cred_uid;
2250 ses->linux_uid = ctx->linux_uid;
2252 ses->sectype = ctx->sectype;
2253 ses->sign = ctx->sign;
2255 /* add server as first channel */
2256 spin_lock(&ses->chan_lock);
2257 ses->chans[0].server = server;
2258 ses->chan_count = 1;
2259 ses->chan_max = ctx->multichannel ? ctx->max_channels:1;
2260 ses->chans_need_reconnect = 1;
2261 spin_unlock(&ses->chan_lock);
2263 mutex_lock(&ses->session_mutex);
2264 rc = cifs_negotiate_protocol(xid, ses, server);
2266 rc = cifs_setup_session(xid, ses, server, ctx->local_nls);
2267 mutex_unlock(&ses->session_mutex);
2269 /* each channel uses a different signing key */
2270 spin_lock(&ses->chan_lock);
2271 memcpy(ses->chans[0].signkey, ses->smb3signingkey,
2272 sizeof(ses->smb3signingkey));
2273 spin_unlock(&ses->chan_lock);
2279 * success, put it on the list and add it as first channel
2280 * note: the session becomes active soon after this. So you'll
2281 * need to lock before changing something in the session.
2283 spin_lock(&cifs_tcp_ses_lock);
2284 list_add(&ses->smb_ses_list, &server->smb_ses_list);
2285 spin_unlock(&cifs_tcp_ses_lock);
2289 cifs_setup_ipc(ses, ctx);
2299 /* this function must be called with tc_lock held */
2300 static int match_tcon(struct cifs_tcon *tcon, struct smb3_fs_context *ctx)
2302 if (tcon->status == TID_EXITING)
2304 if (strncmp(tcon->treeName, ctx->UNC, MAX_TREE_SIZE))
2306 if (tcon->seal != ctx->seal)
2308 if (tcon->snapshot_time != ctx->snapshot_time)
2310 if (tcon->handle_timeout != ctx->handle_timeout)
2312 if (tcon->no_lease != ctx->no_lease)
2314 if (tcon->nodelete != ctx->nodelete)
2319 static struct cifs_tcon *
2320 cifs_find_tcon(struct cifs_ses *ses, struct smb3_fs_context *ctx)
2322 struct cifs_tcon *tcon;
2324 spin_lock(&cifs_tcp_ses_lock);
2325 list_for_each_entry(tcon, &ses->tcon_list, tcon_list) {
2326 spin_lock(&tcon->tc_lock);
2327 if (!match_tcon(tcon, ctx)) {
2328 spin_unlock(&tcon->tc_lock);
2332 spin_unlock(&tcon->tc_lock);
2333 spin_unlock(&cifs_tcp_ses_lock);
2336 spin_unlock(&cifs_tcp_ses_lock);
2341 cifs_put_tcon(struct cifs_tcon *tcon)
2344 struct cifs_ses *ses;
2347 * IPC tcon share the lifetime of their session and are
2348 * destroyed in the session put function
2350 if (tcon == NULL || tcon->ipc)
2354 cifs_dbg(FYI, "%s: tc_count=%d\n", __func__, tcon->tc_count);
2355 spin_lock(&cifs_tcp_ses_lock);
2356 if (--tcon->tc_count > 0) {
2357 spin_unlock(&cifs_tcp_ses_lock);
2361 /* tc_count can never go negative */
2362 WARN_ON(tcon->tc_count < 0);
2364 list_del_init(&tcon->tcon_list);
2365 spin_unlock(&cifs_tcp_ses_lock);
2367 /* cancel polling of interfaces */
2368 cancel_delayed_work_sync(&tcon->query_interfaces);
2370 if (tcon->use_witness) {
2373 rc = cifs_swn_unregister(tcon);
2375 cifs_dbg(VFS, "%s: Failed to unregister for witness notifications: %d\n",
2381 if (ses->server->ops->tree_disconnect)
2382 ses->server->ops->tree_disconnect(xid, tcon);
2385 cifs_fscache_release_super_cookie(tcon);
2387 cifs_put_smb_ses(ses);
2391 * cifs_get_tcon - get a tcon matching @ctx data from @ses
2392 * @ses: smb session to issue the request on
2393 * @ctx: the superblock configuration context to use for building the
2395 * - tcon refcount is the number of mount points using the tcon.
2396 * - ses refcount is the number of tcon using the session.
2398 * 1. This function assumes it is being called from cifs_mount() where
2399 * we already got a session reference (ses refcount +1).
2401 * 2. Since we're in the context of adding a mount point, the end
2402 * result should be either:
2404 * a) a new tcon already allocated with refcount=1 (1 mount point) and
2405 * its session refcount incremented (1 new tcon). This +1 was
2406 * already done in (1).
2408 * b) an existing tcon with refcount+1 (add a mount point to it) and
2409 * identical ses refcount (no new tcon). Because of (1) we need to
2410 * decrement the ses refcount.
2412 static struct cifs_tcon *
2413 cifs_get_tcon(struct cifs_ses *ses, struct smb3_fs_context *ctx)
2416 struct cifs_tcon *tcon;
2418 tcon = cifs_find_tcon(ses, ctx);
2421 * tcon has refcount already incremented but we need to
2422 * decrement extra ses reference gotten by caller (case b)
2424 cifs_dbg(FYI, "Found match on UNC path\n");
2425 cifs_put_smb_ses(ses);
2429 if (!ses->server->ops->tree_connect) {
2434 tcon = tconInfoAlloc();
2440 if (ctx->snapshot_time) {
2441 if (ses->server->vals->protocol_id == 0) {
2443 "Use SMB2 or later for snapshot mount option\n");
2447 tcon->snapshot_time = ctx->snapshot_time;
2450 if (ctx->handle_timeout) {
2451 if (ses->server->vals->protocol_id == 0) {
2453 "Use SMB2.1 or later for handle timeout option\n");
2457 tcon->handle_timeout = ctx->handle_timeout;
2461 if (ctx->password) {
2462 tcon->password = kstrdup(ctx->password, GFP_KERNEL);
2463 if (!tcon->password) {
2470 if (ses->server->vals->protocol_id == 0) {
2472 "SMB3 or later required for encryption\n");
2475 } else if (tcon->ses->server->capabilities &
2476 SMB2_GLOBAL_CAP_ENCRYPTION)
2479 cifs_dbg(VFS, "Encryption is not supported on share\n");
2485 if (ctx->linux_ext) {
2486 if (ses->server->posix_ext_supported) {
2487 tcon->posix_extensions = true;
2488 pr_warn_once("SMB3.11 POSIX Extensions are experimental\n");
2489 } else if ((ses->server->vals->protocol_id == SMB311_PROT_ID) ||
2490 (strcmp(ses->server->vals->version_string,
2491 SMB3ANY_VERSION_STRING) == 0) ||
2492 (strcmp(ses->server->vals->version_string,
2493 SMBDEFAULT_VERSION_STRING) == 0)) {
2494 cifs_dbg(VFS, "Server does not support mounting with posix SMB3.11 extensions\n");
2498 cifs_dbg(VFS, "Check vers= mount option. SMB3.11 "
2499 "disabled but required for POSIX extensions\n");
2506 rc = ses->server->ops->tree_connect(xid, ses, ctx->UNC, tcon,
2509 cifs_dbg(FYI, "Tcon rc = %d\n", rc);
2513 tcon->use_persistent = false;
2514 /* check if SMB2 or later, CIFS does not support persistent handles */
2515 if (ctx->persistent) {
2516 if (ses->server->vals->protocol_id == 0) {
2518 "SMB3 or later required for persistent handles\n");
2521 } else if (ses->server->capabilities &
2522 SMB2_GLOBAL_CAP_PERSISTENT_HANDLES)
2523 tcon->use_persistent = true;
2524 else /* persistent handles requested but not supported */ {
2526 "Persistent handles not supported on share\n");
2530 } else if ((tcon->capabilities & SMB2_SHARE_CAP_CONTINUOUS_AVAILABILITY)
2531 && (ses->server->capabilities & SMB2_GLOBAL_CAP_PERSISTENT_HANDLES)
2532 && (ctx->nopersistent == false)) {
2533 cifs_dbg(FYI, "enabling persistent handles\n");
2534 tcon->use_persistent = true;
2535 } else if (ctx->resilient) {
2536 if (ses->server->vals->protocol_id == 0) {
2538 "SMB2.1 or later required for resilient handles\n");
2542 tcon->use_resilient = true;
2545 tcon->use_witness = false;
2546 if (IS_ENABLED(CONFIG_CIFS_SWN_UPCALL) && ctx->witness) {
2547 if (ses->server->vals->protocol_id >= SMB30_PROT_ID) {
2548 if (tcon->capabilities & SMB2_SHARE_CAP_CLUSTER) {
2550 * Set witness in use flag in first place
2551 * to retry registration in the echo task
2553 tcon->use_witness = true;
2554 /* And try to register immediately */
2555 rc = cifs_swn_register(tcon);
2557 cifs_dbg(VFS, "Failed to register for witness notifications: %d\n", rc);
2561 /* TODO: try to extend for non-cluster uses (eg multichannel) */
2562 cifs_dbg(VFS, "witness requested on mount but no CLUSTER capability on share\n");
2567 cifs_dbg(VFS, "SMB3 or later required for witness option\n");
2573 /* If the user really knows what they are doing they can override */
2574 if (tcon->share_flags & SMB2_SHAREFLAG_NO_CACHING) {
2576 cifs_dbg(VFS, "cache=ro requested on mount but NO_CACHING flag set on share\n");
2577 else if (ctx->cache_rw)
2578 cifs_dbg(VFS, "cache=singleclient requested on mount but NO_CACHING flag set on share\n");
2581 if (ctx->no_lease) {
2582 if (ses->server->vals->protocol_id == 0) {
2584 "SMB2 or later required for nolease option\n");
2588 tcon->no_lease = ctx->no_lease;
2592 * We can have only one retry value for a connection to a share so for
2593 * resources mounted more than once to the same server share the last
2594 * value passed in for the retry flag is used.
2596 tcon->retry = ctx->retry;
2597 tcon->nocase = ctx->nocase;
2598 tcon->broken_sparse_sup = ctx->no_sparse;
2599 if (ses->server->capabilities & SMB2_GLOBAL_CAP_DIRECTORY_LEASING)
2600 tcon->nohandlecache = ctx->nohandlecache;
2602 tcon->nohandlecache = true;
2603 tcon->nodelete = ctx->nodelete;
2604 tcon->local_lease = ctx->local_lease;
2605 INIT_LIST_HEAD(&tcon->pending_opens);
2607 /* schedule query interfaces poll */
2608 INIT_DELAYED_WORK(&tcon->query_interfaces,
2609 smb2_query_server_interfaces);
2610 queue_delayed_work(cifsiod_wq, &tcon->query_interfaces,
2611 (SMB_INTERFACE_POLL_INTERVAL * HZ));
2613 spin_lock(&cifs_tcp_ses_lock);
2614 list_add(&tcon->tcon_list, &ses->tcon_list);
2615 spin_unlock(&cifs_tcp_ses_lock);
2625 cifs_put_tlink(struct tcon_link *tlink)
2627 if (!tlink || IS_ERR(tlink))
2630 if (!atomic_dec_and_test(&tlink->tl_count) ||
2631 test_bit(TCON_LINK_IN_TREE, &tlink->tl_flags)) {
2632 tlink->tl_time = jiffies;
2636 if (!IS_ERR(tlink_tcon(tlink)))
2637 cifs_put_tcon(tlink_tcon(tlink));
2643 compare_mount_options(struct super_block *sb, struct cifs_mnt_data *mnt_data)
2645 struct cifs_sb_info *old = CIFS_SB(sb);
2646 struct cifs_sb_info *new = mnt_data->cifs_sb;
2647 unsigned int oldflags = old->mnt_cifs_flags & CIFS_MOUNT_MASK;
2648 unsigned int newflags = new->mnt_cifs_flags & CIFS_MOUNT_MASK;
2650 if ((sb->s_flags & CIFS_MS_MASK) != (mnt_data->flags & CIFS_MS_MASK))
2653 if (old->mnt_cifs_serverino_autodisabled)
2654 newflags &= ~CIFS_MOUNT_SERVER_INUM;
2656 if (oldflags != newflags)
2660 * We want to share sb only if we don't specify an r/wsize or
2661 * specified r/wsize is greater than or equal to existing one.
2663 if (new->ctx->wsize && new->ctx->wsize < old->ctx->wsize)
2666 if (new->ctx->rsize && new->ctx->rsize < old->ctx->rsize)
2669 if (!uid_eq(old->ctx->linux_uid, new->ctx->linux_uid) ||
2670 !gid_eq(old->ctx->linux_gid, new->ctx->linux_gid))
2673 if (old->ctx->file_mode != new->ctx->file_mode ||
2674 old->ctx->dir_mode != new->ctx->dir_mode)
2677 if (strcmp(old->local_nls->charset, new->local_nls->charset))
2680 if (old->ctx->acregmax != new->ctx->acregmax)
2682 if (old->ctx->acdirmax != new->ctx->acdirmax)
2684 if (old->ctx->closetimeo != new->ctx->closetimeo)
2691 match_prepath(struct super_block *sb, struct cifs_mnt_data *mnt_data)
2693 struct cifs_sb_info *old = CIFS_SB(sb);
2694 struct cifs_sb_info *new = mnt_data->cifs_sb;
2695 bool old_set = (old->mnt_cifs_flags & CIFS_MOUNT_USE_PREFIX_PATH) &&
2697 bool new_set = (new->mnt_cifs_flags & CIFS_MOUNT_USE_PREFIX_PATH) &&
2700 if (old_set && new_set && !strcmp(new->prepath, old->prepath))
2702 else if (!old_set && !new_set)
2709 cifs_match_super(struct super_block *sb, void *data)
2711 struct cifs_mnt_data *mnt_data = data;
2712 struct smb3_fs_context *ctx;
2713 struct cifs_sb_info *cifs_sb;
2714 struct TCP_Server_Info *tcp_srv;
2715 struct cifs_ses *ses;
2716 struct cifs_tcon *tcon;
2717 struct tcon_link *tlink;
2720 spin_lock(&cifs_tcp_ses_lock);
2721 cifs_sb = CIFS_SB(sb);
2722 tlink = cifs_get_tlink(cifs_sb_master_tlink(cifs_sb));
2723 if (tlink == NULL) {
2724 /* can not match superblock if tlink were ever null */
2725 spin_unlock(&cifs_tcp_ses_lock);
2728 tcon = tlink_tcon(tlink);
2730 tcp_srv = ses->server;
2732 ctx = mnt_data->ctx;
2734 spin_lock(&tcp_srv->srv_lock);
2735 spin_lock(&ses->ses_lock);
2736 spin_lock(&tcon->tc_lock);
2737 if (!match_server(tcp_srv, ctx) ||
2738 !match_session(ses, ctx) ||
2739 !match_tcon(tcon, ctx) ||
2740 !match_prepath(sb, mnt_data)) {
2745 rc = compare_mount_options(sb, mnt_data);
2747 spin_unlock(&tcon->tc_lock);
2748 spin_unlock(&ses->ses_lock);
2749 spin_unlock(&tcp_srv->srv_lock);
2751 spin_unlock(&cifs_tcp_ses_lock);
2752 cifs_put_tlink(tlink);
2756 #ifdef CONFIG_DEBUG_LOCK_ALLOC
2757 static struct lock_class_key cifs_key[2];
2758 static struct lock_class_key cifs_slock_key[2];
2761 cifs_reclassify_socket4(struct socket *sock)
2763 struct sock *sk = sock->sk;
2764 BUG_ON(!sock_allow_reclassification(sk));
2765 sock_lock_init_class_and_name(sk, "slock-AF_INET-CIFS",
2766 &cifs_slock_key[0], "sk_lock-AF_INET-CIFS", &cifs_key[0]);
2770 cifs_reclassify_socket6(struct socket *sock)
2772 struct sock *sk = sock->sk;
2773 BUG_ON(!sock_allow_reclassification(sk));
2774 sock_lock_init_class_and_name(sk, "slock-AF_INET6-CIFS",
2775 &cifs_slock_key[1], "sk_lock-AF_INET6-CIFS", &cifs_key[1]);
2779 cifs_reclassify_socket4(struct socket *sock)
2784 cifs_reclassify_socket6(struct socket *sock)
2789 /* See RFC1001 section 14 on representation of Netbios names */
2790 static void rfc1002mangle(char *target, char *source, unsigned int length)
2794 for (i = 0, j = 0; i < (length); i++) {
2795 /* mask a nibble at a time and encode */
2796 target[j] = 'A' + (0x0F & (source[i] >> 4));
2797 target[j+1] = 'A' + (0x0F & source[i]);
2804 bind_socket(struct TCP_Server_Info *server)
2807 if (server->srcaddr.ss_family != AF_UNSPEC) {
2808 /* Bind to the specified local IP address */
2809 struct socket *socket = server->ssocket;
2810 rc = socket->ops->bind(socket,
2811 (struct sockaddr *) &server->srcaddr,
2812 sizeof(server->srcaddr));
2814 struct sockaddr_in *saddr4;
2815 struct sockaddr_in6 *saddr6;
2816 saddr4 = (struct sockaddr_in *)&server->srcaddr;
2817 saddr6 = (struct sockaddr_in6 *)&server->srcaddr;
2818 if (saddr6->sin6_family == AF_INET6)
2819 cifs_server_dbg(VFS, "Failed to bind to: %pI6c, error: %d\n",
2820 &saddr6->sin6_addr, rc);
2822 cifs_server_dbg(VFS, "Failed to bind to: %pI4, error: %d\n",
2823 &saddr4->sin_addr.s_addr, rc);
2830 ip_rfc1001_connect(struct TCP_Server_Info *server)
2834 * some servers require RFC1001 sessinit before sending
2835 * negprot - BB check reconnection in case where second
2836 * sessinit is sent but no second negprot
2838 struct rfc1002_session_packet *ses_init_buf;
2839 struct smb_hdr *smb_buf;
2840 ses_init_buf = kzalloc(sizeof(struct rfc1002_session_packet),
2843 ses_init_buf->trailer.session_req.called_len = 32;
2845 if (server->server_RFC1001_name[0] != 0)
2846 rfc1002mangle(ses_init_buf->trailer.
2847 session_req.called_name,
2848 server->server_RFC1001_name,
2849 RFC1001_NAME_LEN_WITH_NULL);
2851 rfc1002mangle(ses_init_buf->trailer.
2852 session_req.called_name,
2853 DEFAULT_CIFS_CALLED_NAME,
2854 RFC1001_NAME_LEN_WITH_NULL);
2856 ses_init_buf->trailer.session_req.calling_len = 32;
2859 * calling name ends in null (byte 16) from old smb
2862 if (server->workstation_RFC1001_name[0] != 0)
2863 rfc1002mangle(ses_init_buf->trailer.
2864 session_req.calling_name,
2865 server->workstation_RFC1001_name,
2866 RFC1001_NAME_LEN_WITH_NULL);
2868 rfc1002mangle(ses_init_buf->trailer.
2869 session_req.calling_name,
2871 RFC1001_NAME_LEN_WITH_NULL);
2873 ses_init_buf->trailer.session_req.scope1 = 0;
2874 ses_init_buf->trailer.session_req.scope2 = 0;
2875 smb_buf = (struct smb_hdr *)ses_init_buf;
2877 /* sizeof RFC1002_SESSION_REQUEST with no scope */
2878 smb_buf->smb_buf_length = cpu_to_be32(0x81000044);
2879 rc = smb_send(server, smb_buf, 0x44);
2880 kfree(ses_init_buf);
2882 * RFC1001 layer in at least one server
2883 * requires very short break before negprot
2884 * presumably because not expecting negprot
2885 * to follow so fast. This is a simple
2886 * solution that works without
2887 * complicating the code and causes no
2888 * significant slowing down on mount
2891 usleep_range(1000, 2000);
2894 * else the negprot may still work without this
2895 * even though malloc failed
2902 generic_ip_connect(struct TCP_Server_Info *server)
2907 struct socket *socket = server->ssocket;
2908 struct sockaddr *saddr;
2910 saddr = (struct sockaddr *) &server->dstaddr;
2912 if (server->dstaddr.ss_family == AF_INET6) {
2913 struct sockaddr_in6 *ipv6 = (struct sockaddr_in6 *)&server->dstaddr;
2915 sport = ipv6->sin6_port;
2916 slen = sizeof(struct sockaddr_in6);
2918 cifs_dbg(FYI, "%s: connecting to [%pI6]:%d\n", __func__, &ipv6->sin6_addr,
2921 struct sockaddr_in *ipv4 = (struct sockaddr_in *)&server->dstaddr;
2923 sport = ipv4->sin_port;
2924 slen = sizeof(struct sockaddr_in);
2926 cifs_dbg(FYI, "%s: connecting to %pI4:%d\n", __func__, &ipv4->sin_addr,
2930 if (socket == NULL) {
2931 rc = __sock_create(cifs_net_ns(server), sfamily, SOCK_STREAM,
2932 IPPROTO_TCP, &socket, 1);
2934 cifs_server_dbg(VFS, "Error %d creating socket\n", rc);
2935 server->ssocket = NULL;
2939 /* BB other socket options to set KEEPALIVE, NODELAY? */
2940 cifs_dbg(FYI, "Socket created\n");
2941 server->ssocket = socket;
2942 socket->sk->sk_allocation = GFP_NOFS;
2943 if (sfamily == AF_INET6)
2944 cifs_reclassify_socket6(socket);
2946 cifs_reclassify_socket4(socket);
2949 rc = bind_socket(server);
2954 * Eventually check for other socket options to change from
2955 * the default. sock_setsockopt not used because it expects
2958 socket->sk->sk_rcvtimeo = 7 * HZ;
2959 socket->sk->sk_sndtimeo = 5 * HZ;
2961 /* make the bufsizes depend on wsize/rsize and max requests */
2962 if (server->noautotune) {
2963 if (socket->sk->sk_sndbuf < (200 * 1024))
2964 socket->sk->sk_sndbuf = 200 * 1024;
2965 if (socket->sk->sk_rcvbuf < (140 * 1024))
2966 socket->sk->sk_rcvbuf = 140 * 1024;
2969 if (server->tcp_nodelay)
2970 tcp_sock_set_nodelay(socket->sk);
2972 cifs_dbg(FYI, "sndbuf %d rcvbuf %d rcvtimeo 0x%lx\n",
2973 socket->sk->sk_sndbuf,
2974 socket->sk->sk_rcvbuf, socket->sk->sk_rcvtimeo);
2976 rc = socket->ops->connect(socket, saddr, slen,
2977 server->noblockcnt ? O_NONBLOCK : 0);
2979 * When mounting SMB root file systems, we do not want to block in
2980 * connect. Otherwise bail out and then let cifs_reconnect() perform
2981 * reconnect failover - if possible.
2983 if (server->noblockcnt && rc == -EINPROGRESS)
2986 cifs_dbg(FYI, "Error %d connecting to server\n", rc);
2987 trace_smb3_connect_err(server->hostname, server->conn_id, &server->dstaddr, rc);
2988 sock_release(socket);
2989 server->ssocket = NULL;
2992 trace_smb3_connect_done(server->hostname, server->conn_id, &server->dstaddr);
2993 if (sport == htons(RFC1001_PORT))
2994 rc = ip_rfc1001_connect(server);
3000 ip_connect(struct TCP_Server_Info *server)
3003 struct sockaddr_in6 *addr6 = (struct sockaddr_in6 *)&server->dstaddr;
3004 struct sockaddr_in *addr = (struct sockaddr_in *)&server->dstaddr;
3006 if (server->dstaddr.ss_family == AF_INET6)
3007 sport = &addr6->sin6_port;
3009 sport = &addr->sin_port;
3014 /* try with 445 port at first */
3015 *sport = htons(CIFS_PORT);
3017 rc = generic_ip_connect(server);
3021 /* if it failed, try with 139 port */
3022 *sport = htons(RFC1001_PORT);
3025 return generic_ip_connect(server);
3028 #ifdef CONFIG_CIFS_ALLOW_INSECURE_LEGACY
3029 void reset_cifs_unix_caps(unsigned int xid, struct cifs_tcon *tcon,
3030 struct cifs_sb_info *cifs_sb, struct smb3_fs_context *ctx)
3033 * If we are reconnecting then should we check to see if
3034 * any requested capabilities changed locally e.g. via
3035 * remount but we can not do much about it here
3036 * if they have (even if we could detect it by the following)
3037 * Perhaps we could add a backpointer to array of sb from tcon
3038 * or if we change to make all sb to same share the same
3039 * sb as NFS - then we only have one backpointer to sb.
3040 * What if we wanted to mount the server share twice once with
3041 * and once without posixacls or posix paths?
3043 __u64 saved_cap = le64_to_cpu(tcon->fsUnixInfo.Capability);
3045 if (ctx && ctx->no_linux_ext) {
3046 tcon->fsUnixInfo.Capability = 0;
3047 tcon->unix_ext = 0; /* Unix Extensions disabled */
3048 cifs_dbg(FYI, "Linux protocol extensions disabled\n");
3051 tcon->unix_ext = 1; /* Unix Extensions supported */
3053 if (!tcon->unix_ext) {
3054 cifs_dbg(FYI, "Unix extensions disabled so not set on reconnect\n");
3058 if (!CIFSSMBQFSUnixInfo(xid, tcon)) {
3059 __u64 cap = le64_to_cpu(tcon->fsUnixInfo.Capability);
3060 cifs_dbg(FYI, "unix caps which server supports %lld\n", cap);
3062 * check for reconnect case in which we do not
3063 * want to change the mount behavior if we can avoid it
3067 * turn off POSIX ACL and PATHNAMES if not set
3068 * originally at mount time
3070 if ((saved_cap & CIFS_UNIX_POSIX_ACL_CAP) == 0)
3071 cap &= ~CIFS_UNIX_POSIX_ACL_CAP;
3072 if ((saved_cap & CIFS_UNIX_POSIX_PATHNAMES_CAP) == 0) {
3073 if (cap & CIFS_UNIX_POSIX_PATHNAMES_CAP)
3074 cifs_dbg(VFS, "POSIXPATH support change\n");
3075 cap &= ~CIFS_UNIX_POSIX_PATHNAMES_CAP;
3076 } else if ((cap & CIFS_UNIX_POSIX_PATHNAMES_CAP) == 0) {
3077 cifs_dbg(VFS, "possible reconnect error\n");
3078 cifs_dbg(VFS, "server disabled POSIX path support\n");
3082 if (cap & CIFS_UNIX_TRANSPORT_ENCRYPTION_MANDATORY_CAP)
3083 cifs_dbg(VFS, "per-share encryption not supported yet\n");
3085 cap &= CIFS_UNIX_CAP_MASK;
3086 if (ctx && ctx->no_psx_acl)
3087 cap &= ~CIFS_UNIX_POSIX_ACL_CAP;
3088 else if (CIFS_UNIX_POSIX_ACL_CAP & cap) {
3089 cifs_dbg(FYI, "negotiated posix acl support\n");
3091 cifs_sb->mnt_cifs_flags |=
3092 CIFS_MOUNT_POSIXACL;
3095 if (ctx && ctx->posix_paths == 0)
3096 cap &= ~CIFS_UNIX_POSIX_PATHNAMES_CAP;
3097 else if (cap & CIFS_UNIX_POSIX_PATHNAMES_CAP) {
3098 cifs_dbg(FYI, "negotiate posix pathnames\n");
3100 cifs_sb->mnt_cifs_flags |=
3101 CIFS_MOUNT_POSIX_PATHS;
3104 cifs_dbg(FYI, "Negotiate caps 0x%x\n", (int)cap);
3105 #ifdef CONFIG_CIFS_DEBUG2
3106 if (cap & CIFS_UNIX_FCNTL_CAP)
3107 cifs_dbg(FYI, "FCNTL cap\n");
3108 if (cap & CIFS_UNIX_EXTATTR_CAP)
3109 cifs_dbg(FYI, "EXTATTR cap\n");
3110 if (cap & CIFS_UNIX_POSIX_PATHNAMES_CAP)
3111 cifs_dbg(FYI, "POSIX path cap\n");
3112 if (cap & CIFS_UNIX_XATTR_CAP)
3113 cifs_dbg(FYI, "XATTR cap\n");
3114 if (cap & CIFS_UNIX_POSIX_ACL_CAP)
3115 cifs_dbg(FYI, "POSIX ACL cap\n");
3116 if (cap & CIFS_UNIX_LARGE_READ_CAP)
3117 cifs_dbg(FYI, "very large read cap\n");
3118 if (cap & CIFS_UNIX_LARGE_WRITE_CAP)
3119 cifs_dbg(FYI, "very large write cap\n");
3120 if (cap & CIFS_UNIX_TRANSPORT_ENCRYPTION_CAP)
3121 cifs_dbg(FYI, "transport encryption cap\n");
3122 if (cap & CIFS_UNIX_TRANSPORT_ENCRYPTION_MANDATORY_CAP)
3123 cifs_dbg(FYI, "mandatory transport encryption cap\n");
3124 #endif /* CIFS_DEBUG2 */
3125 if (CIFSSMBSetFSUnixInfo(xid, tcon, cap)) {
3127 cifs_dbg(FYI, "resetting capabilities failed\n");
3129 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");
3134 #endif /* CONFIG_CIFS_ALLOW_INSECURE_LEGACY */
3136 int cifs_setup_cifs_sb(struct cifs_sb_info *cifs_sb)
3138 struct smb3_fs_context *ctx = cifs_sb->ctx;
3140 INIT_DELAYED_WORK(&cifs_sb->prune_tlinks, cifs_prune_tlinks);
3142 spin_lock_init(&cifs_sb->tlink_tree_lock);
3143 cifs_sb->tlink_tree = RB_ROOT;
3145 cifs_dbg(FYI, "file mode: %04ho dir mode: %04ho\n",
3146 ctx->file_mode, ctx->dir_mode);
3148 /* this is needed for ASCII cp to Unicode converts */
3149 if (ctx->iocharset == NULL) {
3150 /* load_nls_default cannot return null */
3151 cifs_sb->local_nls = load_nls_default();
3153 cifs_sb->local_nls = load_nls(ctx->iocharset);
3154 if (cifs_sb->local_nls == NULL) {
3155 cifs_dbg(VFS, "CIFS mount error: iocharset %s not found\n",
3160 ctx->local_nls = cifs_sb->local_nls;
3162 smb3_update_mnt_flags(cifs_sb);
3165 cifs_dbg(FYI, "mounting share using direct i/o\n");
3166 if (ctx->cache_ro) {
3167 cifs_dbg(VFS, "mounting share with read only caching. Ensure that the share will not be modified while in use.\n");
3168 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_RO_CACHE;
3169 } else if (ctx->cache_rw) {
3170 cifs_dbg(VFS, "mounting share in single client RW caching mode. Ensure that no other systems will be accessing the share.\n");
3171 cifs_sb->mnt_cifs_flags |= (CIFS_MOUNT_RO_CACHE |
3172 CIFS_MOUNT_RW_CACHE);
3175 if ((ctx->cifs_acl) && (ctx->dynperm))
3176 cifs_dbg(VFS, "mount option dynperm ignored if cifsacl mount option supported\n");
3179 cifs_sb->prepath = kstrdup(ctx->prepath, GFP_KERNEL);
3180 if (cifs_sb->prepath == NULL)
3182 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_USE_PREFIX_PATH;
3188 /* Release all succeed connections */
3189 static inline void mount_put_conns(struct mount_ctx *mnt_ctx)
3194 cifs_put_tcon(mnt_ctx->tcon);
3195 else if (mnt_ctx->ses)
3196 cifs_put_smb_ses(mnt_ctx->ses);
3197 else if (mnt_ctx->server)
3198 cifs_put_tcp_session(mnt_ctx->server, 0);
3199 mnt_ctx->cifs_sb->mnt_cifs_flags &= ~CIFS_MOUNT_POSIX_PATHS;
3200 free_xid(mnt_ctx->xid);
3203 /* Get connections for tcp, ses and tcon */
3204 static int mount_get_conns(struct mount_ctx *mnt_ctx)
3207 struct TCP_Server_Info *server = NULL;
3208 struct cifs_ses *ses = NULL;
3209 struct cifs_tcon *tcon = NULL;
3210 struct smb3_fs_context *ctx = mnt_ctx->fs_ctx;
3211 struct cifs_sb_info *cifs_sb = mnt_ctx->cifs_sb;
3216 /* get a reference to a tcp session */
3217 server = cifs_get_tcp_session(ctx, NULL);
3218 if (IS_ERR(server)) {
3219 rc = PTR_ERR(server);
3224 /* get a reference to a SMB session */
3225 ses = cifs_get_smb_ses(server, ctx);
3232 if ((ctx->persistent == true) && (!(ses->server->capabilities &
3233 SMB2_GLOBAL_CAP_PERSISTENT_HANDLES))) {
3234 cifs_server_dbg(VFS, "persistent handles not supported by server\n");
3239 /* search for existing tcon to this server share */
3240 tcon = cifs_get_tcon(ses, ctx);
3247 /* if new SMB3.11 POSIX extensions are supported do not remap / and \ */
3248 if (tcon->posix_extensions)
3249 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_POSIX_PATHS;
3251 #ifdef CONFIG_CIFS_ALLOW_INSECURE_LEGACY
3252 /* tell server which Unix caps we support */
3253 if (cap_unix(tcon->ses)) {
3255 * reset of caps checks mount to see if unix extensions disabled
3256 * for just this mount.
3258 reset_cifs_unix_caps(xid, tcon, cifs_sb, ctx);
3259 spin_lock(&tcon->ses->server->srv_lock);
3260 if ((tcon->ses->server->tcpStatus == CifsNeedReconnect) &&
3261 (le64_to_cpu(tcon->fsUnixInfo.Capability) &
3262 CIFS_UNIX_TRANSPORT_ENCRYPTION_MANDATORY_CAP)) {
3263 spin_unlock(&tcon->ses->server->srv_lock);
3267 spin_unlock(&tcon->ses->server->srv_lock);
3269 #endif /* CONFIG_CIFS_ALLOW_INSECURE_LEGACY */
3270 tcon->unix_ext = 0; /* server does not support them */
3272 /* do not care if a following call succeed - informational */
3273 if (!tcon->pipe && server->ops->qfs_tcon) {
3274 server->ops->qfs_tcon(xid, tcon, cifs_sb);
3275 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_RO_CACHE) {
3276 if (tcon->fsDevInfo.DeviceCharacteristics &
3277 cpu_to_le32(FILE_READ_ONLY_DEVICE))
3278 cifs_dbg(VFS, "mounted to read only share\n");
3279 else if ((cifs_sb->mnt_cifs_flags &
3280 CIFS_MOUNT_RW_CACHE) == 0)
3281 cifs_dbg(VFS, "read only mount of RW share\n");
3282 /* no need to log a RW mount of a typical RW share */
3287 * Clamp the rsize/wsize mount arguments if they are too big for the server
3288 * and set the rsize/wsize to the negotiated values if not passed in by
3291 if ((cifs_sb->ctx->wsize == 0) ||
3292 (cifs_sb->ctx->wsize > server->ops->negotiate_wsize(tcon, ctx)))
3293 cifs_sb->ctx->wsize = server->ops->negotiate_wsize(tcon, ctx);
3294 if ((cifs_sb->ctx->rsize == 0) ||
3295 (cifs_sb->ctx->rsize > server->ops->negotiate_rsize(tcon, ctx)))
3296 cifs_sb->ctx->rsize = server->ops->negotiate_rsize(tcon, ctx);
3299 * The cookie is initialized from volume info returned above.
3300 * Inside cifs_fscache_get_super_cookie it checks
3301 * that we do not get super cookie twice.
3303 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_FSCACHE)
3304 cifs_fscache_get_super_cookie(tcon);
3307 mnt_ctx->server = server;
3309 mnt_ctx->tcon = tcon;
3315 static int mount_setup_tlink(struct cifs_sb_info *cifs_sb, struct cifs_ses *ses,
3316 struct cifs_tcon *tcon)
3318 struct tcon_link *tlink;
3320 /* hang the tcon off of the superblock */
3321 tlink = kzalloc(sizeof(*tlink), GFP_KERNEL);
3325 tlink->tl_uid = ses->linux_uid;
3326 tlink->tl_tcon = tcon;
3327 tlink->tl_time = jiffies;
3328 set_bit(TCON_LINK_MASTER, &tlink->tl_flags);
3329 set_bit(TCON_LINK_IN_TREE, &tlink->tl_flags);
3331 cifs_sb->master_tlink = tlink;
3332 spin_lock(&cifs_sb->tlink_tree_lock);
3333 tlink_rb_insert(&cifs_sb->tlink_tree, tlink);
3334 spin_unlock(&cifs_sb->tlink_tree_lock);
3336 queue_delayed_work(cifsiod_wq, &cifs_sb->prune_tlinks,
3341 #ifdef CONFIG_CIFS_DFS_UPCALL
3342 /* Get unique dfs connections */
3343 static int mount_get_dfs_conns(struct mount_ctx *mnt_ctx)
3347 mnt_ctx->fs_ctx->nosharesock = true;
3348 rc = mount_get_conns(mnt_ctx);
3349 if (mnt_ctx->server) {
3350 cifs_dbg(FYI, "%s: marking tcp session as a dfs connection\n", __func__);
3351 spin_lock(&mnt_ctx->server->srv_lock);
3352 mnt_ctx->server->is_dfs_conn = true;
3353 spin_unlock(&mnt_ctx->server->srv_lock);
3359 * cifs_build_path_to_root returns full path to root when we do not have an
3360 * existing connection (tcon)
3363 build_unc_path_to_root(const struct smb3_fs_context *ctx,
3364 const struct cifs_sb_info *cifs_sb, bool useppath)
3366 char *full_path, *pos;
3367 unsigned int pplen = useppath && ctx->prepath ?
3368 strlen(ctx->prepath) + 1 : 0;
3369 unsigned int unc_len = strnlen(ctx->UNC, MAX_TREE_SIZE + 1);
3371 if (unc_len > MAX_TREE_SIZE)
3372 return ERR_PTR(-EINVAL);
3374 full_path = kmalloc(unc_len + pplen + 1, GFP_KERNEL);
3375 if (full_path == NULL)
3376 return ERR_PTR(-ENOMEM);
3378 memcpy(full_path, ctx->UNC, unc_len);
3379 pos = full_path + unc_len;
3382 *pos = CIFS_DIR_SEP(cifs_sb);
3383 memcpy(pos + 1, ctx->prepath, pplen);
3387 *pos = '\0'; /* add trailing null */
3388 convert_delimiter(full_path, CIFS_DIR_SEP(cifs_sb));
3389 cifs_dbg(FYI, "%s: full_path=%s\n", __func__, full_path);
3394 * expand_dfs_referral - Update cifs_sb from dfs referral path
3396 * cifs_sb->ctx->mount_options will be (re-)allocated to a string containing updated options for the
3397 * submount. Otherwise it will be left untouched.
3399 static int expand_dfs_referral(struct mount_ctx *mnt_ctx, const char *full_path,
3400 struct dfs_info3_param *referral)
3403 struct cifs_sb_info *cifs_sb = mnt_ctx->cifs_sb;
3404 struct smb3_fs_context *ctx = mnt_ctx->fs_ctx;
3405 char *fake_devname = NULL, *mdata = NULL;
3407 mdata = cifs_compose_mount_options(cifs_sb->ctx->mount_options, full_path + 1, referral,
3409 if (IS_ERR(mdata)) {
3410 rc = PTR_ERR(mdata);
3414 * We can not clear out the whole structure since we no longer have an explicit
3415 * function to parse a mount-string. Instead we need to clear out the individual
3416 * fields that are no longer valid.
3418 kfree(ctx->prepath);
3419 ctx->prepath = NULL;
3420 rc = cifs_setup_volume_info(ctx, mdata, fake_devname);
3422 kfree(fake_devname);
3423 kfree(cifs_sb->ctx->mount_options);
3424 cifs_sb->ctx->mount_options = mdata;
3430 /* TODO: all callers to this are broken. We are not parsing mount_options here
3431 * we should pass a clone of the original context?
3434 cifs_setup_volume_info(struct smb3_fs_context *ctx, const char *mntopts, const char *devname)
3439 cifs_dbg(FYI, "%s: devname=%s\n", __func__, devname);
3440 rc = smb3_parse_devname(devname, ctx);
3442 cifs_dbg(VFS, "%s: failed to parse %s: %d\n", __func__, devname, rc);
3450 rc = smb3_parse_opt(mntopts, "ip", &ip);
3452 cifs_dbg(VFS, "%s: failed to parse ip options: %d\n", __func__, rc);
3456 rc = cifs_convert_address((struct sockaddr *)&ctx->dstaddr, ip, strlen(ip));
3459 cifs_dbg(VFS, "%s: failed to convert ip address\n", __func__);
3464 if (ctx->nullauth) {
3465 cifs_dbg(FYI, "Anonymous login\n");
3466 kfree(ctx->username);
3467 ctx->username = NULL;
3468 } else if (ctx->username) {
3469 /* BB fixme parse for domain name here */
3470 cifs_dbg(FYI, "Username: %s\n", ctx->username);
3472 cifs_dbg(VFS, "No username specified\n");
3473 /* In userspace mount helper we can get user name from alternate
3474 locations such as env variables and files on disk */
3482 cifs_are_all_path_components_accessible(struct TCP_Server_Info *server,
3484 struct cifs_tcon *tcon,
3485 struct cifs_sb_info *cifs_sb,
3492 int skip = added_treename ? 1 : 0;
3494 sep = CIFS_DIR_SEP(cifs_sb);
3497 rc = server->ops->is_path_accessible(xid, tcon, cifs_sb, "");
3499 /* skip separators */
3504 /* next separator */
3505 while (*s && *s != sep)
3508 * if the treename is added, we then have to skip the first
3509 * part within the separators
3516 * temporarily null-terminate the path at the end of
3517 * the current component
3521 rc = server->ops->is_path_accessible(xid, tcon, cifs_sb,
3529 * Check if path is remote (i.e. a DFS share).
3531 * Return -EREMOTE if it is, otherwise 0 or -errno.
3533 static int is_path_remote(struct mount_ctx *mnt_ctx)
3536 struct cifs_sb_info *cifs_sb = mnt_ctx->cifs_sb;
3537 struct TCP_Server_Info *server = mnt_ctx->server;
3538 unsigned int xid = mnt_ctx->xid;
3539 struct cifs_tcon *tcon = mnt_ctx->tcon;
3540 struct smb3_fs_context *ctx = mnt_ctx->fs_ctx;
3542 #ifdef CONFIG_CIFS_DFS_UPCALL
3543 bool nodfs = cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_DFS;
3546 if (!server->ops->is_path_accessible)
3550 * cifs_build_path_to_root works only when we have a valid tcon
3552 full_path = cifs_build_path_to_root(ctx, cifs_sb, tcon,
3553 tcon->Flags & SMB_SHARE_IS_IN_DFS);
3554 if (full_path == NULL)
3557 cifs_dbg(FYI, "%s: full_path: %s\n", __func__, full_path);
3559 rc = server->ops->is_path_accessible(xid, tcon, cifs_sb,
3561 #ifdef CONFIG_CIFS_DFS_UPCALL
3568 /* path *might* exist with non-ASCII characters in DFS root
3569 * try again with full path (only if nodfs is not set) */
3570 if (rc == -ENOENT && is_tcon_dfs(tcon))
3571 rc = cifs_dfs_query_info_nonascii_quirk(xid, tcon, cifs_sb,
3574 if (rc != 0 && rc != -EREMOTE)
3577 if (rc != -EREMOTE) {
3578 rc = cifs_are_all_path_components_accessible(server, xid, tcon,
3579 cifs_sb, full_path, tcon->Flags & SMB_SHARE_IS_IN_DFS);
3581 cifs_server_dbg(VFS, "cannot query dirs between root and final path, enabling CIFS_MOUNT_USE_PREFIX_PATH\n");
3582 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_USE_PREFIX_PATH;
3592 #ifdef CONFIG_CIFS_DFS_UPCALL
3593 static void set_root_ses(struct mount_ctx *mnt_ctx)
3596 spin_lock(&cifs_tcp_ses_lock);
3597 mnt_ctx->ses->ses_count++;
3598 spin_unlock(&cifs_tcp_ses_lock);
3599 dfs_cache_add_refsrv_session(&mnt_ctx->mount_id, mnt_ctx->ses);
3601 mnt_ctx->root_ses = mnt_ctx->ses;
3604 static int is_dfs_mount(struct mount_ctx *mnt_ctx, bool *isdfs, struct dfs_cache_tgt_list *root_tl)
3607 struct cifs_sb_info *cifs_sb = mnt_ctx->cifs_sb;
3608 struct smb3_fs_context *ctx = mnt_ctx->fs_ctx;
3612 rc = mount_get_conns(mnt_ctx);
3614 * If called with 'nodfs' mount option, then skip DFS resolving. Otherwise unconditionally
3615 * try to get an DFS referral (even cached) to determine whether it is an DFS mount.
3617 * Skip prefix path to provide support for DFS referrals from w2k8 servers which don't seem
3618 * to respond with PATH_NOT_COVERED to requests that include the prefix.
3620 if ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_DFS) ||
3621 dfs_cache_find(mnt_ctx->xid, mnt_ctx->ses, cifs_sb->local_nls, cifs_remap(cifs_sb),
3622 ctx->UNC + 1, NULL, root_tl)) {
3625 /* Check if it is fully accessible and then mount it */
3626 rc = is_path_remote(mnt_ctx);
3629 else if (rc != -EREMOTE)
3635 static int connect_dfs_target(struct mount_ctx *mnt_ctx, const char *full_path,
3636 const char *ref_path, struct dfs_cache_tgt_iterator *tit)
3639 struct dfs_info3_param ref = {};
3640 struct cifs_sb_info *cifs_sb = mnt_ctx->cifs_sb;
3641 char *oldmnt = cifs_sb->ctx->mount_options;
3643 cifs_dbg(FYI, "%s: full_path=%s ref_path=%s target=%s\n", __func__, full_path, ref_path,
3644 dfs_cache_get_tgt_name(tit));
3646 rc = dfs_cache_get_tgt_referral(ref_path, tit, &ref);
3650 rc = expand_dfs_referral(mnt_ctx, full_path, &ref);
3654 /* Connect to new target only if we were redirected (e.g. mount options changed) */
3655 if (oldmnt != cifs_sb->ctx->mount_options) {
3656 mount_put_conns(mnt_ctx);
3657 rc = mount_get_dfs_conns(mnt_ctx);
3660 if (cifs_is_referral_server(mnt_ctx->tcon, &ref))
3661 set_root_ses(mnt_ctx);
3662 rc = dfs_cache_update_tgthint(mnt_ctx->xid, mnt_ctx->root_ses, cifs_sb->local_nls,
3663 cifs_remap(cifs_sb), ref_path, tit);
3667 free_dfs_info_param(&ref);
3671 static int connect_dfs_root(struct mount_ctx *mnt_ctx, struct dfs_cache_tgt_list *root_tl)
3675 struct cifs_sb_info *cifs_sb = mnt_ctx->cifs_sb;
3676 struct smb3_fs_context *ctx = mnt_ctx->fs_ctx;
3677 struct dfs_cache_tgt_iterator *tit;
3679 /* Put initial connections as they might be shared with other mounts. We need unique dfs
3680 * connections per mount to properly failover, so mount_get_dfs_conns() must be used from
3683 mount_put_conns(mnt_ctx);
3684 mount_get_dfs_conns(mnt_ctx);
3685 set_root_ses(mnt_ctx);
3687 full_path = build_unc_path_to_root(ctx, cifs_sb, true);
3688 if (IS_ERR(full_path))
3689 return PTR_ERR(full_path);
3691 mnt_ctx->origin_fullpath = dfs_cache_canonical_path(ctx->UNC, cifs_sb->local_nls,
3692 cifs_remap(cifs_sb));
3693 if (IS_ERR(mnt_ctx->origin_fullpath)) {
3694 rc = PTR_ERR(mnt_ctx->origin_fullpath);
3695 mnt_ctx->origin_fullpath = NULL;
3699 /* Try all dfs root targets */
3700 for (rc = -ENOENT, tit = dfs_cache_get_tgt_iterator(root_tl);
3701 tit; tit = dfs_cache_get_next_tgt(root_tl, tit)) {
3702 rc = connect_dfs_target(mnt_ctx, full_path, mnt_ctx->origin_fullpath + 1, tit);
3704 mnt_ctx->leaf_fullpath = kstrdup(mnt_ctx->origin_fullpath, GFP_KERNEL);
3705 if (!mnt_ctx->leaf_fullpath)
3716 static int __follow_dfs_link(struct mount_ctx *mnt_ctx)
3719 struct cifs_sb_info *cifs_sb = mnt_ctx->cifs_sb;
3720 struct smb3_fs_context *ctx = mnt_ctx->fs_ctx;
3722 struct dfs_cache_tgt_list tl = DFS_CACHE_TGT_LIST_INIT(tl);
3723 struct dfs_cache_tgt_iterator *tit;
3725 full_path = build_unc_path_to_root(ctx, cifs_sb, true);
3726 if (IS_ERR(full_path))
3727 return PTR_ERR(full_path);
3729 kfree(mnt_ctx->leaf_fullpath);
3730 mnt_ctx->leaf_fullpath = dfs_cache_canonical_path(full_path, cifs_sb->local_nls,
3731 cifs_remap(cifs_sb));
3732 if (IS_ERR(mnt_ctx->leaf_fullpath)) {
3733 rc = PTR_ERR(mnt_ctx->leaf_fullpath);
3734 mnt_ctx->leaf_fullpath = NULL;
3738 /* Get referral from dfs link */
3739 rc = dfs_cache_find(mnt_ctx->xid, mnt_ctx->root_ses, cifs_sb->local_nls,
3740 cifs_remap(cifs_sb), mnt_ctx->leaf_fullpath + 1, NULL, &tl);
3744 /* Try all dfs link targets. If an I/O fails from currently connected DFS target with an
3745 * error other than STATUS_PATH_NOT_COVERED (-EREMOTE), then retry it from other targets as
3746 * specified in MS-DFSC "3.1.5.2 I/O Operation to Target Fails with an Error Other Than
3747 * STATUS_PATH_NOT_COVERED."
3749 for (rc = -ENOENT, tit = dfs_cache_get_tgt_iterator(&tl);
3750 tit; tit = dfs_cache_get_next_tgt(&tl, tit)) {
3751 rc = connect_dfs_target(mnt_ctx, full_path, mnt_ctx->leaf_fullpath + 1, tit);
3753 rc = is_path_remote(mnt_ctx);
3754 if (!rc || rc == -EREMOTE)
3761 dfs_cache_free_tgts(&tl);
3765 static int follow_dfs_link(struct mount_ctx *mnt_ctx)
3768 struct cifs_sb_info *cifs_sb = mnt_ctx->cifs_sb;
3769 struct smb3_fs_context *ctx = mnt_ctx->fs_ctx;
3773 full_path = build_unc_path_to_root(ctx, cifs_sb, true);
3774 if (IS_ERR(full_path))
3775 return PTR_ERR(full_path);
3777 kfree(mnt_ctx->origin_fullpath);
3778 mnt_ctx->origin_fullpath = dfs_cache_canonical_path(full_path, cifs_sb->local_nls,
3779 cifs_remap(cifs_sb));
3782 if (IS_ERR(mnt_ctx->origin_fullpath)) {
3783 rc = PTR_ERR(mnt_ctx->origin_fullpath);
3784 mnt_ctx->origin_fullpath = NULL;
3789 rc = __follow_dfs_link(mnt_ctx);
3790 if (!rc || rc != -EREMOTE)
3792 } while (rc = -ELOOP, ++num_links < MAX_NESTED_LINKS);
3797 /* Set up DFS referral paths for failover */
3798 static void setup_server_referral_paths(struct mount_ctx *mnt_ctx)
3800 struct TCP_Server_Info *server = mnt_ctx->server;
3802 mutex_lock(&server->refpath_lock);
3803 server->origin_fullpath = mnt_ctx->origin_fullpath;
3804 server->leaf_fullpath = mnt_ctx->leaf_fullpath;
3805 server->current_fullpath = mnt_ctx->leaf_fullpath;
3806 mutex_unlock(&server->refpath_lock);
3807 mnt_ctx->origin_fullpath = mnt_ctx->leaf_fullpath = NULL;
3810 int cifs_mount(struct cifs_sb_info *cifs_sb, struct smb3_fs_context *ctx)
3813 struct mount_ctx mnt_ctx = { .cifs_sb = cifs_sb, .fs_ctx = ctx, };
3814 struct dfs_cache_tgt_list tl = DFS_CACHE_TGT_LIST_INIT(tl);
3817 rc = is_dfs_mount(&mnt_ctx, &isdfs, &tl);
3823 /* proceed as DFS mount */
3824 uuid_gen(&mnt_ctx.mount_id);
3825 rc = connect_dfs_root(&mnt_ctx, &tl);
3826 dfs_cache_free_tgts(&tl);
3831 rc = is_path_remote(&mnt_ctx);
3833 rc = follow_dfs_link(&mnt_ctx);
3837 setup_server_referral_paths(&mnt_ctx);
3839 * After reconnecting to a different server, unique ids won't match anymore, so we disable
3840 * serverino. This prevents dentry revalidation to think the dentry are stale (ESTALE).
3842 cifs_autodisable_serverino(cifs_sb);
3844 * Force the use of prefix path to support failover on DFS paths that resolve to targets
3845 * that have different prefix paths.
3847 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_USE_PREFIX_PATH;
3848 kfree(cifs_sb->prepath);
3849 cifs_sb->prepath = ctx->prepath;
3850 ctx->prepath = NULL;
3851 uuid_copy(&cifs_sb->dfs_mount_id, &mnt_ctx.mount_id);
3854 free_xid(mnt_ctx.xid);
3855 cifs_try_adding_channels(cifs_sb, mnt_ctx.ses);
3856 return mount_setup_tlink(cifs_sb, mnt_ctx.ses, mnt_ctx.tcon);
3859 dfs_cache_put_refsrv_sessions(&mnt_ctx.mount_id);
3860 kfree(mnt_ctx.origin_fullpath);
3861 kfree(mnt_ctx.leaf_fullpath);
3862 mount_put_conns(&mnt_ctx);
3866 int cifs_mount(struct cifs_sb_info *cifs_sb, struct smb3_fs_context *ctx)
3869 struct mount_ctx mnt_ctx = { .cifs_sb = cifs_sb, .fs_ctx = ctx, };
3871 rc = mount_get_conns(&mnt_ctx);
3876 rc = is_path_remote(&mnt_ctx);
3883 free_xid(mnt_ctx.xid);
3884 return mount_setup_tlink(cifs_sb, mnt_ctx.ses, mnt_ctx.tcon);
3887 mount_put_conns(&mnt_ctx);
3893 * Issue a TREE_CONNECT request.
3896 CIFSTCon(const unsigned int xid, struct cifs_ses *ses,
3897 const char *tree, struct cifs_tcon *tcon,
3898 const struct nls_table *nls_codepage)
3900 struct smb_hdr *smb_buffer;
3901 struct smb_hdr *smb_buffer_response;
3904 unsigned char *bcc_ptr;
3907 __u16 bytes_left, count;
3912 smb_buffer = cifs_buf_get();
3913 if (smb_buffer == NULL)
3916 smb_buffer_response = smb_buffer;
3918 header_assemble(smb_buffer, SMB_COM_TREE_CONNECT_ANDX,
3919 NULL /*no tid */ , 4 /*wct */ );
3921 smb_buffer->Mid = get_next_mid(ses->server);
3922 smb_buffer->Uid = ses->Suid;
3923 pSMB = (TCONX_REQ *) smb_buffer;
3924 pSMBr = (TCONX_RSP *) smb_buffer_response;
3926 pSMB->AndXCommand = 0xFF;
3927 pSMB->Flags = cpu_to_le16(TCON_EXTENDED_SECINFO);
3928 bcc_ptr = &pSMB->Password[0];
3929 if (tcon->pipe || (ses->server->sec_mode & SECMODE_USER)) {
3930 pSMB->PasswordLength = cpu_to_le16(1); /* minimum */
3931 *bcc_ptr = 0; /* password is null byte */
3932 bcc_ptr++; /* skip password */
3933 /* already aligned so no need to do it below */
3936 if (ses->server->sign)
3937 smb_buffer->Flags2 |= SMBFLG2_SECURITY_SIGNATURE;
3939 if (ses->capabilities & CAP_STATUS32) {
3940 smb_buffer->Flags2 |= SMBFLG2_ERR_STATUS;
3942 if (ses->capabilities & CAP_DFS) {
3943 smb_buffer->Flags2 |= SMBFLG2_DFS;
3945 if (ses->capabilities & CAP_UNICODE) {
3946 smb_buffer->Flags2 |= SMBFLG2_UNICODE;
3948 cifs_strtoUTF16((__le16 *) bcc_ptr, tree,
3949 6 /* max utf8 char length in bytes */ *
3950 (/* server len*/ + 256 /* share len */), nls_codepage);
3951 bcc_ptr += 2 * length; /* convert num 16 bit words to bytes */
3952 bcc_ptr += 2; /* skip trailing null */
3953 } else { /* ASCII */
3954 strcpy(bcc_ptr, tree);
3955 bcc_ptr += strlen(tree) + 1;
3957 strcpy(bcc_ptr, "?????");
3958 bcc_ptr += strlen("?????");
3960 count = bcc_ptr - &pSMB->Password[0];
3961 be32_add_cpu(&pSMB->hdr.smb_buf_length, count);
3962 pSMB->ByteCount = cpu_to_le16(count);
3964 rc = SendReceive(xid, ses, smb_buffer, smb_buffer_response, &length,
3967 /* above now done in SendReceive */
3971 tcon->tid = smb_buffer_response->Tid;
3972 bcc_ptr = pByteArea(smb_buffer_response);
3973 bytes_left = get_bcc(smb_buffer_response);
3974 length = strnlen(bcc_ptr, bytes_left - 2);
3975 if (smb_buffer->Flags2 & SMBFLG2_UNICODE)
3981 /* skip service field (NB: this field is always ASCII) */
3983 if ((bcc_ptr[0] == 'I') && (bcc_ptr[1] == 'P') &&
3984 (bcc_ptr[2] == 'C')) {
3985 cifs_dbg(FYI, "IPC connection\n");
3989 } else if (length == 2) {
3990 if ((bcc_ptr[0] == 'A') && (bcc_ptr[1] == ':')) {
3991 /* the most common case */
3992 cifs_dbg(FYI, "disk share connection\n");
3995 bcc_ptr += length + 1;
3996 bytes_left -= (length + 1);
3997 strscpy(tcon->treeName, tree, sizeof(tcon->treeName));
3999 /* mostly informational -- no need to fail on error here */
4000 kfree(tcon->nativeFileSystem);
4001 tcon->nativeFileSystem = cifs_strndup_from_utf16(bcc_ptr,
4002 bytes_left, is_unicode,
4005 cifs_dbg(FYI, "nativeFileSystem=%s\n", tcon->nativeFileSystem);
4007 if ((smb_buffer_response->WordCount == 3) ||
4008 (smb_buffer_response->WordCount == 7))
4009 /* field is in same location */
4010 tcon->Flags = le16_to_cpu(pSMBr->OptionalSupport);
4013 cifs_dbg(FYI, "Tcon flags: 0x%x\n", tcon->Flags);
4016 cifs_buf_release(smb_buffer);
4020 static void delayed_free(struct rcu_head *p)
4022 struct cifs_sb_info *cifs_sb = container_of(p, struct cifs_sb_info, rcu);
4024 unload_nls(cifs_sb->local_nls);
4025 smb3_cleanup_fs_context(cifs_sb->ctx);
4030 cifs_umount(struct cifs_sb_info *cifs_sb)
4032 struct rb_root *root = &cifs_sb->tlink_tree;
4033 struct rb_node *node;
4034 struct tcon_link *tlink;
4036 cancel_delayed_work_sync(&cifs_sb->prune_tlinks);
4038 spin_lock(&cifs_sb->tlink_tree_lock);
4039 while ((node = rb_first(root))) {
4040 tlink = rb_entry(node, struct tcon_link, tl_rbnode);
4041 cifs_get_tlink(tlink);
4042 clear_bit(TCON_LINK_IN_TREE, &tlink->tl_flags);
4043 rb_erase(node, root);
4045 spin_unlock(&cifs_sb->tlink_tree_lock);
4046 cifs_put_tlink(tlink);
4047 spin_lock(&cifs_sb->tlink_tree_lock);
4049 spin_unlock(&cifs_sb->tlink_tree_lock);
4051 kfree(cifs_sb->prepath);
4052 #ifdef CONFIG_CIFS_DFS_UPCALL
4053 dfs_cache_put_refsrv_sessions(&cifs_sb->dfs_mount_id);
4055 call_rcu(&cifs_sb->rcu, delayed_free);
4059 cifs_negotiate_protocol(const unsigned int xid, struct cifs_ses *ses,
4060 struct TCP_Server_Info *server)
4064 if (!server->ops->need_neg || !server->ops->negotiate)
4067 /* only send once per connect */
4068 spin_lock(&server->srv_lock);
4069 if (!server->ops->need_neg(server) ||
4070 server->tcpStatus != CifsNeedNegotiate) {
4071 spin_unlock(&server->srv_lock);
4074 server->tcpStatus = CifsInNegotiate;
4075 spin_unlock(&server->srv_lock);
4077 rc = server->ops->negotiate(xid, ses, server);
4079 spin_lock(&server->srv_lock);
4080 if (server->tcpStatus == CifsInNegotiate)
4081 server->tcpStatus = CifsGood;
4084 spin_unlock(&server->srv_lock);
4086 spin_lock(&server->srv_lock);
4087 if (server->tcpStatus == CifsInNegotiate)
4088 server->tcpStatus = CifsNeedNegotiate;
4089 spin_unlock(&server->srv_lock);
4096 cifs_setup_session(const unsigned int xid, struct cifs_ses *ses,
4097 struct TCP_Server_Info *server,
4098 struct nls_table *nls_info)
4101 struct sockaddr_in6 *addr6 = (struct sockaddr_in6 *)&server->dstaddr;
4102 struct sockaddr_in *addr = (struct sockaddr_in *)&server->dstaddr;
4103 bool is_binding = false;
4105 spin_lock(&ses->ses_lock);
4106 if (server->dstaddr.ss_family == AF_INET6)
4107 scnprintf(ses->ip_addr, sizeof(ses->ip_addr), "%pI6", &addr6->sin6_addr);
4109 scnprintf(ses->ip_addr, sizeof(ses->ip_addr), "%pI4", &addr->sin_addr);
4111 if (ses->ses_status != SES_GOOD &&
4112 ses->ses_status != SES_NEW &&
4113 ses->ses_status != SES_NEED_RECON) {
4114 spin_unlock(&ses->ses_lock);
4118 /* only send once per connect */
4119 spin_lock(&ses->chan_lock);
4120 if (CIFS_ALL_CHANS_GOOD(ses) ||
4121 cifs_chan_in_reconnect(ses, server)) {
4122 spin_unlock(&ses->chan_lock);
4123 spin_unlock(&ses->ses_lock);
4126 is_binding = !CIFS_ALL_CHANS_NEED_RECONNECT(ses);
4127 cifs_chan_set_in_reconnect(ses, server);
4128 spin_unlock(&ses->chan_lock);
4131 ses->ses_status = SES_IN_SETUP;
4132 spin_unlock(&ses->ses_lock);
4135 ses->capabilities = server->capabilities;
4136 if (!linuxExtEnabled)
4137 ses->capabilities &= (~server->vals->cap_unix);
4139 if (ses->auth_key.response) {
4140 cifs_dbg(FYI, "Free previous auth_key.response = %p\n",
4141 ses->auth_key.response);
4142 kfree(ses->auth_key.response);
4143 ses->auth_key.response = NULL;
4144 ses->auth_key.len = 0;
4148 cifs_dbg(FYI, "Security Mode: 0x%x Capabilities: 0x%x TimeAdjust: %d\n",
4149 server->sec_mode, server->capabilities, server->timeAdj);
4151 if (server->ops->sess_setup)
4152 rc = server->ops->sess_setup(xid, ses, server, nls_info);
4155 cifs_server_dbg(VFS, "Send error in SessSetup = %d\n", rc);
4156 spin_lock(&ses->ses_lock);
4157 if (ses->ses_status == SES_IN_SETUP)
4158 ses->ses_status = SES_NEED_RECON;
4159 spin_lock(&ses->chan_lock);
4160 cifs_chan_clear_in_reconnect(ses, server);
4161 spin_unlock(&ses->chan_lock);
4162 spin_unlock(&ses->ses_lock);
4164 spin_lock(&ses->ses_lock);
4165 if (ses->ses_status == SES_IN_SETUP)
4166 ses->ses_status = SES_GOOD;
4167 spin_lock(&ses->chan_lock);
4168 cifs_chan_clear_in_reconnect(ses, server);
4169 cifs_chan_clear_need_reconnect(ses, server);
4170 spin_unlock(&ses->chan_lock);
4171 spin_unlock(&ses->ses_lock);
4178 cifs_set_vol_auth(struct smb3_fs_context *ctx, struct cifs_ses *ses)
4180 ctx->sectype = ses->sectype;
4182 /* krb5 is special, since we don't need username or pw */
4183 if (ctx->sectype == Kerberos)
4186 return cifs_set_cifscreds(ctx, ses);
4189 static struct cifs_tcon *
4190 cifs_construct_tcon(struct cifs_sb_info *cifs_sb, kuid_t fsuid)
4193 struct cifs_tcon *master_tcon = cifs_sb_master_tcon(cifs_sb);
4194 struct cifs_ses *ses;
4195 struct cifs_tcon *tcon = NULL;
4196 struct smb3_fs_context *ctx;
4198 ctx = kzalloc(sizeof(*ctx), GFP_KERNEL);
4200 return ERR_PTR(-ENOMEM);
4202 ctx->local_nls = cifs_sb->local_nls;
4203 ctx->linux_uid = fsuid;
4204 ctx->cred_uid = fsuid;
4205 ctx->UNC = master_tcon->treeName;
4206 ctx->retry = master_tcon->retry;
4207 ctx->nocase = master_tcon->nocase;
4208 ctx->nohandlecache = master_tcon->nohandlecache;
4209 ctx->local_lease = master_tcon->local_lease;
4210 ctx->no_lease = master_tcon->no_lease;
4211 ctx->resilient = master_tcon->use_resilient;
4212 ctx->persistent = master_tcon->use_persistent;
4213 ctx->handle_timeout = master_tcon->handle_timeout;
4214 ctx->no_linux_ext = !master_tcon->unix_ext;
4215 ctx->linux_ext = master_tcon->posix_extensions;
4216 ctx->sectype = master_tcon->ses->sectype;
4217 ctx->sign = master_tcon->ses->sign;
4218 ctx->seal = master_tcon->seal;
4219 ctx->witness = master_tcon->use_witness;
4221 rc = cifs_set_vol_auth(ctx, master_tcon->ses);
4227 /* get a reference for the same TCP session */
4228 spin_lock(&cifs_tcp_ses_lock);
4229 ++master_tcon->ses->server->srv_count;
4230 spin_unlock(&cifs_tcp_ses_lock);
4232 ses = cifs_get_smb_ses(master_tcon->ses->server, ctx);
4234 tcon = (struct cifs_tcon *)ses;
4235 cifs_put_tcp_session(master_tcon->ses->server, 0);
4239 tcon = cifs_get_tcon(ses, ctx);
4241 cifs_put_smb_ses(ses);
4245 #ifdef CONFIG_CIFS_ALLOW_INSECURE_LEGACY
4247 reset_cifs_unix_caps(0, tcon, NULL, ctx);
4248 #endif /* CONFIG_CIFS_ALLOW_INSECURE_LEGACY */
4251 kfree(ctx->username);
4252 kfree_sensitive(ctx->password);
4259 cifs_sb_master_tcon(struct cifs_sb_info *cifs_sb)
4261 return tlink_tcon(cifs_sb_master_tlink(cifs_sb));
4264 /* find and return a tlink with given uid */
4265 static struct tcon_link *
4266 tlink_rb_search(struct rb_root *root, kuid_t uid)
4268 struct rb_node *node = root->rb_node;
4269 struct tcon_link *tlink;
4272 tlink = rb_entry(node, struct tcon_link, tl_rbnode);
4274 if (uid_gt(tlink->tl_uid, uid))
4275 node = node->rb_left;
4276 else if (uid_lt(tlink->tl_uid, uid))
4277 node = node->rb_right;
4284 /* insert a tcon_link into the tree */
4286 tlink_rb_insert(struct rb_root *root, struct tcon_link *new_tlink)
4288 struct rb_node **new = &(root->rb_node), *parent = NULL;
4289 struct tcon_link *tlink;
4292 tlink = rb_entry(*new, struct tcon_link, tl_rbnode);
4295 if (uid_gt(tlink->tl_uid, new_tlink->tl_uid))
4296 new = &((*new)->rb_left);
4298 new = &((*new)->rb_right);
4301 rb_link_node(&new_tlink->tl_rbnode, parent, new);
4302 rb_insert_color(&new_tlink->tl_rbnode, root);
4306 * Find or construct an appropriate tcon given a cifs_sb and the fsuid of the
4309 * If the superblock doesn't refer to a multiuser mount, then just return
4310 * the master tcon for the mount.
4312 * First, search the rbtree for an existing tcon for this fsuid. If one
4313 * exists, then check to see if it's pending construction. If it is then wait
4314 * for construction to complete. Once it's no longer pending, check to see if
4315 * it failed and either return an error or retry construction, depending on
4318 * If one doesn't exist then insert a new tcon_link struct into the tree and
4319 * try to construct a new one.
4322 cifs_sb_tlink(struct cifs_sb_info *cifs_sb)
4325 kuid_t fsuid = current_fsuid();
4326 struct tcon_link *tlink, *newtlink;
4328 if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MULTIUSER))
4329 return cifs_get_tlink(cifs_sb_master_tlink(cifs_sb));
4331 spin_lock(&cifs_sb->tlink_tree_lock);
4332 tlink = tlink_rb_search(&cifs_sb->tlink_tree, fsuid);
4334 cifs_get_tlink(tlink);
4335 spin_unlock(&cifs_sb->tlink_tree_lock);
4337 if (tlink == NULL) {
4338 newtlink = kzalloc(sizeof(*tlink), GFP_KERNEL);
4339 if (newtlink == NULL)
4340 return ERR_PTR(-ENOMEM);
4341 newtlink->tl_uid = fsuid;
4342 newtlink->tl_tcon = ERR_PTR(-EACCES);
4343 set_bit(TCON_LINK_PENDING, &newtlink->tl_flags);
4344 set_bit(TCON_LINK_IN_TREE, &newtlink->tl_flags);
4345 cifs_get_tlink(newtlink);
4347 spin_lock(&cifs_sb->tlink_tree_lock);
4348 /* was one inserted after previous search? */
4349 tlink = tlink_rb_search(&cifs_sb->tlink_tree, fsuid);
4351 cifs_get_tlink(tlink);
4352 spin_unlock(&cifs_sb->tlink_tree_lock);
4354 goto wait_for_construction;
4357 tlink_rb_insert(&cifs_sb->tlink_tree, tlink);
4358 spin_unlock(&cifs_sb->tlink_tree_lock);
4360 wait_for_construction:
4361 ret = wait_on_bit(&tlink->tl_flags, TCON_LINK_PENDING,
4362 TASK_INTERRUPTIBLE);
4364 cifs_put_tlink(tlink);
4365 return ERR_PTR(-ERESTARTSYS);
4368 /* if it's good, return it */
4369 if (!IS_ERR(tlink->tl_tcon))
4372 /* return error if we tried this already recently */
4373 if (time_before(jiffies, tlink->tl_time + TLINK_ERROR_EXPIRE)) {
4374 cifs_put_tlink(tlink);
4375 return ERR_PTR(-EACCES);
4378 if (test_and_set_bit(TCON_LINK_PENDING, &tlink->tl_flags))
4379 goto wait_for_construction;
4382 tlink->tl_tcon = cifs_construct_tcon(cifs_sb, fsuid);
4383 clear_bit(TCON_LINK_PENDING, &tlink->tl_flags);
4384 wake_up_bit(&tlink->tl_flags, TCON_LINK_PENDING);
4386 if (IS_ERR(tlink->tl_tcon)) {
4387 cifs_put_tlink(tlink);
4388 return ERR_PTR(-EACCES);
4395 * periodic workqueue job that scans tcon_tree for a superblock and closes
4399 cifs_prune_tlinks(struct work_struct *work)
4401 struct cifs_sb_info *cifs_sb = container_of(work, struct cifs_sb_info,
4403 struct rb_root *root = &cifs_sb->tlink_tree;
4404 struct rb_node *node;
4405 struct rb_node *tmp;
4406 struct tcon_link *tlink;
4409 * Because we drop the spinlock in the loop in order to put the tlink
4410 * it's not guarded against removal of links from the tree. The only
4411 * places that remove entries from the tree are this function and
4412 * umounts. Because this function is non-reentrant and is canceled
4413 * before umount can proceed, this is safe.
4415 spin_lock(&cifs_sb->tlink_tree_lock);
4416 node = rb_first(root);
4417 while (node != NULL) {
4419 node = rb_next(tmp);
4420 tlink = rb_entry(tmp, struct tcon_link, tl_rbnode);
4422 if (test_bit(TCON_LINK_MASTER, &tlink->tl_flags) ||
4423 atomic_read(&tlink->tl_count) != 0 ||
4424 time_after(tlink->tl_time + TLINK_IDLE_EXPIRE, jiffies))
4427 cifs_get_tlink(tlink);
4428 clear_bit(TCON_LINK_IN_TREE, &tlink->tl_flags);
4429 rb_erase(tmp, root);
4431 spin_unlock(&cifs_sb->tlink_tree_lock);
4432 cifs_put_tlink(tlink);
4433 spin_lock(&cifs_sb->tlink_tree_lock);
4435 spin_unlock(&cifs_sb->tlink_tree_lock);
4437 queue_delayed_work(cifsiod_wq, &cifs_sb->prune_tlinks,
4441 #ifdef CONFIG_CIFS_DFS_UPCALL
4442 /* Update dfs referral path of superblock */
4443 static int update_server_fullpath(struct TCP_Server_Info *server, struct cifs_sb_info *cifs_sb,
4447 size_t len = strlen(target);
4448 char *refpath, *npath;
4450 if (unlikely(len < 2 || *target != '\\'))
4453 if (target[1] == '\\') {
4455 refpath = kmalloc(len, GFP_KERNEL);
4459 scnprintf(refpath, len, "%s", target);
4461 len += sizeof("\\");
4462 refpath = kmalloc(len, GFP_KERNEL);
4466 scnprintf(refpath, len, "\\%s", target);
4469 npath = dfs_cache_canonical_path(refpath, cifs_sb->local_nls, cifs_remap(cifs_sb));
4472 if (IS_ERR(npath)) {
4473 rc = PTR_ERR(npath);
4475 mutex_lock(&server->refpath_lock);
4476 kfree(server->leaf_fullpath);
4477 server->leaf_fullpath = npath;
4478 mutex_unlock(&server->refpath_lock);
4479 server->current_fullpath = server->leaf_fullpath;
4484 static int target_share_matches_server(struct TCP_Server_Info *server, const char *tcp_host,
4485 size_t tcp_host_len, char *share, bool *target_match)
4488 const char *dfs_host;
4489 size_t dfs_host_len;
4491 *target_match = true;
4492 extract_unc_hostname(share, &dfs_host, &dfs_host_len);
4494 /* Check if hostnames or addresses match */
4495 if (dfs_host_len != tcp_host_len || strncasecmp(dfs_host, tcp_host, dfs_host_len) != 0) {
4496 cifs_dbg(FYI, "%s: %.*s doesn't match %.*s\n", __func__, (int)dfs_host_len,
4497 dfs_host, (int)tcp_host_len, tcp_host);
4498 rc = match_target_ip(server, dfs_host, dfs_host_len, target_match);
4500 cifs_dbg(VFS, "%s: failed to match target ip: %d\n", __func__, rc);
4505 static int __tree_connect_dfs_target(const unsigned int xid, struct cifs_tcon *tcon,
4506 struct cifs_sb_info *cifs_sb, char *tree, bool islink,
4507 struct dfs_cache_tgt_list *tl)
4510 struct TCP_Server_Info *server = tcon->ses->server;
4511 const struct smb_version_operations *ops = server->ops;
4512 struct cifs_tcon *ipc = tcon->ses->tcon_ipc;
4513 char *share = NULL, *prefix = NULL;
4514 const char *tcp_host;
4515 size_t tcp_host_len;
4516 struct dfs_cache_tgt_iterator *tit;
4519 extract_unc_hostname(server->hostname, &tcp_host, &tcp_host_len);
4521 tit = dfs_cache_get_tgt_iterator(tl);
4527 /* Try to tree connect to all dfs targets */
4528 for (; tit; tit = dfs_cache_get_next_tgt(tl, tit)) {
4529 const char *target = dfs_cache_get_tgt_name(tit);
4530 struct dfs_cache_tgt_list ntl = DFS_CACHE_TGT_LIST_INIT(ntl);
4534 share = prefix = NULL;
4536 /* Check if share matches with tcp ses */
4537 rc = dfs_cache_get_tgt_share(server->current_fullpath + 1, tit, &share, &prefix);
4539 cifs_dbg(VFS, "%s: failed to parse target share: %d\n", __func__, rc);
4543 rc = target_share_matches_server(server, tcp_host, tcp_host_len, share,
4547 if (!target_match) {
4552 if (ipc->need_reconnect) {
4553 scnprintf(tree, MAX_TREE_SIZE, "\\\\%s\\IPC$", server->hostname);
4554 rc = ops->tree_connect(xid, ipc->ses, tree, ipc, cifs_sb->local_nls);
4559 scnprintf(tree, MAX_TREE_SIZE, "\\%s", share);
4561 rc = ops->tree_connect(xid, tcon->ses, tree, tcon, cifs_sb->local_nls);
4565 * If no dfs referrals were returned from link target, then just do a TREE_CONNECT
4566 * to it. Otherwise, cache the dfs referral and then mark current tcp ses for
4567 * reconnect so either the demultiplex thread or the echo worker will reconnect to
4568 * newly resolved target.
4570 if (dfs_cache_find(xid, tcon->ses, cifs_sb->local_nls, cifs_remap(cifs_sb), target,
4572 rc = ops->tree_connect(xid, tcon->ses, tree, tcon, cifs_sb->local_nls);
4575 rc = dfs_cache_noreq_update_tgthint(server->current_fullpath + 1, tit);
4577 rc = cifs_update_super_prepath(cifs_sb, prefix);
4579 /* Target is another dfs share */
4580 rc = update_server_fullpath(server, cifs_sb, target);
4581 dfs_cache_free_tgts(tl);
4585 list_replace_init(&ntl.tl_list, &tl->tl_list);
4587 dfs_cache_free_tgts(&ntl);
4599 static int tree_connect_dfs_target(const unsigned int xid, struct cifs_tcon *tcon,
4600 struct cifs_sb_info *cifs_sb, char *tree, bool islink,
4601 struct dfs_cache_tgt_list *tl)
4605 struct TCP_Server_Info *server = tcon->ses->server;
4608 rc = __tree_connect_dfs_target(xid, tcon, cifs_sb, tree, islink, tl);
4609 if (!rc || rc != -EREMOTE)
4611 } while (rc = -ELOOP, ++num_links < MAX_NESTED_LINKS);
4613 * If we couldn't tree connect to any targets from last referral path, then retry from
4614 * original referral path.
4616 if (rc && server->current_fullpath != server->origin_fullpath) {
4617 server->current_fullpath = server->origin_fullpath;
4618 cifs_signal_cifsd_for_reconnect(server, true);
4621 dfs_cache_free_tgts(tl);
4625 int cifs_tree_connect(const unsigned int xid, struct cifs_tcon *tcon, const struct nls_table *nlsc)
4628 struct TCP_Server_Info *server = tcon->ses->server;
4629 const struct smb_version_operations *ops = server->ops;
4630 struct super_block *sb = NULL;
4631 struct cifs_sb_info *cifs_sb;
4632 struct dfs_cache_tgt_list tl = DFS_CACHE_TGT_LIST_INIT(tl);
4634 struct dfs_info3_param ref = {0};
4636 /* only send once per connect */
4637 spin_lock(&tcon->tc_lock);
4638 if (tcon->ses->ses_status != SES_GOOD ||
4639 (tcon->status != TID_NEW &&
4640 tcon->status != TID_NEED_TCON)) {
4641 spin_unlock(&tcon->tc_lock);
4644 tcon->status = TID_IN_TCON;
4645 spin_unlock(&tcon->tc_lock);
4647 tree = kzalloc(MAX_TREE_SIZE, GFP_KERNEL);
4654 scnprintf(tree, MAX_TREE_SIZE, "\\\\%s\\IPC$", server->hostname);
4655 rc = ops->tree_connect(xid, tcon->ses, tree, tcon, nlsc);
4659 sb = cifs_get_tcp_super(server);
4662 cifs_dbg(VFS, "%s: could not find superblock: %d\n", __func__, rc);
4666 cifs_sb = CIFS_SB(sb);
4668 /* If it is not dfs or there was no cached dfs referral, then reconnect to same share */
4669 if (!server->current_fullpath ||
4670 dfs_cache_noreq_find(server->current_fullpath + 1, &ref, &tl)) {
4671 rc = ops->tree_connect(xid, tcon->ses, tcon->treeName, tcon, cifs_sb->local_nls);
4675 rc = tree_connect_dfs_target(xid, tcon, cifs_sb, tree, ref.server_type == DFS_TYPE_LINK,
4677 free_dfs_info_param(&ref);
4681 cifs_put_tcp_super(sb);
4684 spin_lock(&tcon->tc_lock);
4685 if (tcon->status == TID_IN_TCON)
4686 tcon->status = TID_NEED_TCON;
4687 spin_unlock(&tcon->tc_lock);
4689 spin_lock(&tcon->tc_lock);
4690 if (tcon->status == TID_IN_TCON)
4691 tcon->status = TID_GOOD;
4692 spin_unlock(&tcon->tc_lock);
4693 tcon->need_reconnect = false;
4699 int cifs_tree_connect(const unsigned int xid, struct cifs_tcon *tcon, const struct nls_table *nlsc)
4702 const struct smb_version_operations *ops = tcon->ses->server->ops;
4704 /* only send once per connect */
4705 spin_lock(&tcon->tc_lock);
4706 if (tcon->ses->ses_status != SES_GOOD ||
4707 (tcon->status != TID_NEW &&
4708 tcon->status != TID_NEED_TCON)) {
4709 spin_unlock(&tcon->tc_lock);
4712 tcon->status = TID_IN_TCON;
4713 spin_unlock(&tcon->tc_lock);
4715 rc = ops->tree_connect(xid, tcon->ses, tcon->treeName, tcon, nlsc);
4717 spin_lock(&tcon->tc_lock);
4718 if (tcon->status == TID_IN_TCON)
4719 tcon->status = TID_NEED_TCON;
4720 spin_unlock(&tcon->tc_lock);
4722 spin_lock(&tcon->tc_lock);
4723 if (tcon->status == TID_IN_TCON)
4724 tcon->status = TID_GOOD;
4725 tcon->need_reconnect = false;
4726 spin_unlock(&tcon->tc_lock);