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1// SPDX-License-Identifier: LGPL-2.1
2/*
3 *
4 * Copyright (C) International Business Machines Corp., 2002,2011
5 * Author(s): Steve French (sfrench@us.ibm.com)
6 *
7 */
8#include <linux/fs.h>
9#include <linux/net.h>
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>
32#include <net/ipv6.h>
33#include <linux/parser.h>
34#include <linux/bvec.h>
35#include "cifspdu.h"
36#include "cifsglob.h"
37#include "cifsproto.h"
38#include "cifs_unicode.h"
39#include "cifs_debug.h"
40#include "cifs_fs_sb.h"
41#include "ntlmssp.h"
42#include "nterr.h"
43#include "rfc1002pdu.h"
44#include "fscache.h"
45#include "smb2proto.h"
46#include "smbdirect.h"
47#include "dns_resolve.h"
48#ifdef CONFIG_CIFS_DFS_UPCALL
49#include "dfs.h"
50#include "dfs_cache.h"
51#endif
52#include "fs_context.h"
53#include "cifs_swn.h"
54
55extern mempool_t *cifs_req_poolp;
56extern bool disable_legacy_dialects;
57
58/* FIXME: should these be tunable? */
59#define TLINK_ERROR_EXPIRE (1 * HZ)
60#define TLINK_IDLE_EXPIRE (600 * HZ)
61
62/* Drop the connection to not overload the server */
63#define NUM_STATUS_IO_TIMEOUT 5
64
65static int ip_connect(struct TCP_Server_Info *server);
66static int generic_ip_connect(struct TCP_Server_Info *server);
67static void tlink_rb_insert(struct rb_root *root, struct tcon_link *new_tlink);
68static void cifs_prune_tlinks(struct work_struct *work);
69
70/*
71 * Resolve hostname and set ip addr in tcp ses. Useful for hostnames that may
72 * get their ip addresses changed at some point.
73 *
74 * This should be called with server->srv_mutex held.
75 */
76static int reconn_set_ipaddr_from_hostname(struct TCP_Server_Info *server)
77{
78 int rc;
79 int len;
80 char *unc;
81 struct sockaddr_storage ss;
82 time64_t expiry, now;
83 unsigned long ttl = SMB_DNS_RESOLVE_INTERVAL_DEFAULT;
84
85 if (!server->hostname)
86 return -EINVAL;
87
88 /* if server hostname isn't populated, there's nothing to do here */
89 if (server->hostname[0] == '\0')
90 return 0;
91
92 len = strlen(server->hostname) + 3;
93
94 unc = kmalloc(len, GFP_KERNEL);
95 if (!unc) {
96 cifs_dbg(FYI, "%s: failed to create UNC path\n", __func__);
97 return -ENOMEM;
98 }
99 scnprintf(unc, len, "\\\\%s", server->hostname);
100
101 spin_lock(&server->srv_lock);
102 ss = server->dstaddr;
103 spin_unlock(&server->srv_lock);
104
105 rc = dns_resolve_server_name_to_ip(unc, (struct sockaddr *)&ss, &expiry);
106 kfree(unc);
107
108 if (rc < 0) {
109 cifs_dbg(FYI, "%s: failed to resolve server part of %s to IP: %d\n",
110 __func__, server->hostname, rc);
111 goto requeue_resolve;
112 }
113
114 spin_lock(&server->srv_lock);
115 memcpy(&server->dstaddr, &ss, sizeof(server->dstaddr));
116 spin_unlock(&server->srv_lock);
117
118 now = ktime_get_real_seconds();
119 if (expiry && expiry > now)
120 /* To make sure we don't use the cached entry, retry 1s */
121 ttl = max_t(unsigned long, expiry - now, SMB_DNS_RESOLVE_INTERVAL_MIN) + 1;
122
123requeue_resolve:
124 cifs_dbg(FYI, "%s: next dns resolution scheduled for %lu seconds in the future\n",
125 __func__, ttl);
126 mod_delayed_work(cifsiod_wq, &server->resolve, (ttl * HZ));
127
128 return rc;
129}
130
131static void smb2_query_server_interfaces(struct work_struct *work)
132{
133 int rc;
134 struct cifs_tcon *tcon = container_of(work,
135 struct cifs_tcon,
136 query_interfaces.work);
137
138 /*
139 * query server network interfaces, in case they change
140 */
141 rc = SMB3_request_interfaces(0, tcon, false);
142 if (rc) {
143 cifs_dbg(FYI, "%s: failed to query server interfaces: %d\n",
144 __func__, rc);
145 }
146
147 queue_delayed_work(cifsiod_wq, &tcon->query_interfaces,
148 (SMB_INTERFACE_POLL_INTERVAL * HZ));
149}
150
151static void cifs_resolve_server(struct work_struct *work)
152{
153 int rc;
154 struct TCP_Server_Info *server = container_of(work,
155 struct TCP_Server_Info, resolve.work);
156
157 cifs_server_lock(server);
158
159 /*
160 * Resolve the hostname again to make sure that IP address is up-to-date.
161 */
162 rc = reconn_set_ipaddr_from_hostname(server);
163 if (rc) {
164 cifs_dbg(FYI, "%s: failed to resolve hostname: %d\n",
165 __func__, rc);
166 }
167
168 cifs_server_unlock(server);
169}
170
171/*
172 * Update the tcpStatus for the server.
173 * This is used to signal the cifsd thread to call cifs_reconnect
174 * ONLY cifsd thread should call cifs_reconnect. For any other
175 * thread, use this function
176 *
177 * @server: the tcp ses for which reconnect is needed
178 * @all_channels: if this needs to be done for all channels
179 */
180void
181cifs_signal_cifsd_for_reconnect(struct TCP_Server_Info *server,
182 bool all_channels)
183{
184 struct TCP_Server_Info *pserver;
185 struct cifs_ses *ses;
186 int i;
187
188 /* If server is a channel, select the primary channel */
189 pserver = CIFS_SERVER_IS_CHAN(server) ? server->primary_server : server;
190
191 spin_lock(&pserver->srv_lock);
192 if (!all_channels) {
193 pserver->tcpStatus = CifsNeedReconnect;
194 spin_unlock(&pserver->srv_lock);
195 return;
196 }
197 spin_unlock(&pserver->srv_lock);
198
199 spin_lock(&cifs_tcp_ses_lock);
200 list_for_each_entry(ses, &pserver->smb_ses_list, smb_ses_list) {
201 spin_lock(&ses->chan_lock);
202 for (i = 0; i < ses->chan_count; i++) {
203 spin_lock(&ses->chans[i].server->srv_lock);
204 ses->chans[i].server->tcpStatus = CifsNeedReconnect;
205 spin_unlock(&ses->chans[i].server->srv_lock);
206 }
207 spin_unlock(&ses->chan_lock);
208 }
209 spin_unlock(&cifs_tcp_ses_lock);
210}
211
212/*
213 * Mark all sessions and tcons for reconnect.
214 * IMPORTANT: make sure that this gets called only from
215 * cifsd thread. For any other thread, use
216 * cifs_signal_cifsd_for_reconnect
217 *
218 * @server: the tcp ses for which reconnect is needed
219 * @server needs to be previously set to CifsNeedReconnect.
220 * @mark_smb_session: whether even sessions need to be marked
221 */
222void
223cifs_mark_tcp_ses_conns_for_reconnect(struct TCP_Server_Info *server,
224 bool mark_smb_session)
225{
226 struct TCP_Server_Info *pserver;
227 struct cifs_ses *ses, *nses;
228 struct cifs_tcon *tcon;
229
230 /*
231 * before reconnecting the tcp session, mark the smb session (uid) and the tid bad so they
232 * are not used until reconnected.
233 */
234 cifs_dbg(FYI, "%s: marking necessary sessions and tcons for reconnect\n", __func__);
235
236 /* If server is a channel, select the primary channel */
237 pserver = CIFS_SERVER_IS_CHAN(server) ? server->primary_server : server;
238
239
240 spin_lock(&cifs_tcp_ses_lock);
241 list_for_each_entry_safe(ses, nses, &pserver->smb_ses_list, smb_ses_list) {
242 /* check if iface is still active */
243 if (!cifs_chan_is_iface_active(ses, server))
244 cifs_chan_update_iface(ses, server);
245
246 spin_lock(&ses->chan_lock);
247 if (!mark_smb_session && cifs_chan_needs_reconnect(ses, server))
248 goto next_session;
249
250 if (mark_smb_session)
251 CIFS_SET_ALL_CHANS_NEED_RECONNECT(ses);
252 else
253 cifs_chan_set_need_reconnect(ses, server);
254
255 /* If all channels need reconnect, then tcon needs reconnect */
256 if (!mark_smb_session && !CIFS_ALL_CHANS_NEED_RECONNECT(ses))
257 goto next_session;
258
259 ses->ses_status = SES_NEED_RECON;
260
261 list_for_each_entry(tcon, &ses->tcon_list, tcon_list) {
262 tcon->need_reconnect = true;
263 tcon->status = TID_NEED_RECON;
264 }
265 if (ses->tcon_ipc) {
266 ses->tcon_ipc->need_reconnect = true;
267 ses->tcon_ipc->status = TID_NEED_RECON;
268 }
269
270next_session:
271 spin_unlock(&ses->chan_lock);
272 }
273 spin_unlock(&cifs_tcp_ses_lock);
274}
275
276static void
277cifs_abort_connection(struct TCP_Server_Info *server)
278{
279 struct mid_q_entry *mid, *nmid;
280 struct list_head retry_list;
281
282 server->maxBuf = 0;
283 server->max_read = 0;
284
285 /* do not want to be sending data on a socket we are freeing */
286 cifs_dbg(FYI, "%s: tearing down socket\n", __func__);
287 cifs_server_lock(server);
288 if (server->ssocket) {
289 cifs_dbg(FYI, "State: 0x%x Flags: 0x%lx\n", server->ssocket->state,
290 server->ssocket->flags);
291 kernel_sock_shutdown(server->ssocket, SHUT_WR);
292 cifs_dbg(FYI, "Post shutdown state: 0x%x Flags: 0x%lx\n", server->ssocket->state,
293 server->ssocket->flags);
294 sock_release(server->ssocket);
295 server->ssocket = NULL;
296 }
297 server->sequence_number = 0;
298 server->session_estab = false;
299 kfree_sensitive(server->session_key.response);
300 server->session_key.response = NULL;
301 server->session_key.len = 0;
302 server->lstrp = jiffies;
303
304 /* mark submitted MIDs for retry and issue callback */
305 INIT_LIST_HEAD(&retry_list);
306 cifs_dbg(FYI, "%s: moving mids to private list\n", __func__);
307 spin_lock(&server->mid_lock);
308 list_for_each_entry_safe(mid, nmid, &server->pending_mid_q, qhead) {
309 kref_get(&mid->refcount);
310 if (mid->mid_state == MID_REQUEST_SUBMITTED)
311 mid->mid_state = MID_RETRY_NEEDED;
312 list_move(&mid->qhead, &retry_list);
313 mid->mid_flags |= MID_DELETED;
314 }
315 spin_unlock(&server->mid_lock);
316 cifs_server_unlock(server);
317
318 cifs_dbg(FYI, "%s: issuing mid callbacks\n", __func__);
319 list_for_each_entry_safe(mid, nmid, &retry_list, qhead) {
320 list_del_init(&mid->qhead);
321 mid->callback(mid);
322 release_mid(mid);
323 }
324
325 if (cifs_rdma_enabled(server)) {
326 cifs_server_lock(server);
327 smbd_destroy(server);
328 cifs_server_unlock(server);
329 }
330}
331
332static bool cifs_tcp_ses_needs_reconnect(struct TCP_Server_Info *server, int num_targets)
333{
334 spin_lock(&server->srv_lock);
335 server->nr_targets = num_targets;
336 if (server->tcpStatus == CifsExiting) {
337 /* the demux thread will exit normally next time through the loop */
338 spin_unlock(&server->srv_lock);
339 wake_up(&server->response_q);
340 return false;
341 }
342
343 cifs_dbg(FYI, "Mark tcp session as need reconnect\n");
344 trace_smb3_reconnect(server->CurrentMid, server->conn_id,
345 server->hostname);
346 server->tcpStatus = CifsNeedReconnect;
347
348 spin_unlock(&server->srv_lock);
349 return true;
350}
351
352/*
353 * cifs tcp session reconnection
354 *
355 * mark tcp session as reconnecting so temporarily locked
356 * mark all smb sessions as reconnecting for tcp session
357 * reconnect tcp session
358 * wake up waiters on reconnection? - (not needed currently)
359 *
360 * if mark_smb_session is passed as true, unconditionally mark
361 * the smb session (and tcon) for reconnect as well. This value
362 * doesn't really matter for non-multichannel scenario.
363 *
364 */
365static int __cifs_reconnect(struct TCP_Server_Info *server,
366 bool mark_smb_session)
367{
368 int rc = 0;
369
370 if (!cifs_tcp_ses_needs_reconnect(server, 1))
371 return 0;
372
373 cifs_mark_tcp_ses_conns_for_reconnect(server, mark_smb_session);
374
375 cifs_abort_connection(server);
376
377 do {
378 try_to_freeze();
379 cifs_server_lock(server);
380
381 if (!cifs_swn_set_server_dstaddr(server)) {
382 /* resolve the hostname again to make sure that IP address is up-to-date */
383 rc = reconn_set_ipaddr_from_hostname(server);
384 cifs_dbg(FYI, "%s: reconn_set_ipaddr_from_hostname: rc=%d\n", __func__, rc);
385 }
386
387 if (cifs_rdma_enabled(server))
388 rc = smbd_reconnect(server);
389 else
390 rc = generic_ip_connect(server);
391 if (rc) {
392 cifs_server_unlock(server);
393 cifs_dbg(FYI, "%s: reconnect error %d\n", __func__, rc);
394 msleep(3000);
395 } else {
396 atomic_inc(&tcpSesReconnectCount);
397 set_credits(server, 1);
398 spin_lock(&server->srv_lock);
399 if (server->tcpStatus != CifsExiting)
400 server->tcpStatus = CifsNeedNegotiate;
401 spin_unlock(&server->srv_lock);
402 cifs_swn_reset_server_dstaddr(server);
403 cifs_server_unlock(server);
404 mod_delayed_work(cifsiod_wq, &server->reconnect, 0);
405 }
406 } while (server->tcpStatus == CifsNeedReconnect);
407
408 spin_lock(&server->srv_lock);
409 if (server->tcpStatus == CifsNeedNegotiate)
410 mod_delayed_work(cifsiod_wq, &server->echo, 0);
411 spin_unlock(&server->srv_lock);
412
413 wake_up(&server->response_q);
414 return rc;
415}
416
417#ifdef CONFIG_CIFS_DFS_UPCALL
418static int __reconnect_target_unlocked(struct TCP_Server_Info *server, const char *target)
419{
420 int rc;
421 char *hostname;
422
423 if (!cifs_swn_set_server_dstaddr(server)) {
424 if (server->hostname != target) {
425 hostname = extract_hostname(target);
426 if (!IS_ERR(hostname)) {
427 kfree(server->hostname);
428 server->hostname = hostname;
429 } else {
430 cifs_dbg(FYI, "%s: couldn't extract hostname or address from dfs target: %ld\n",
431 __func__, PTR_ERR(hostname));
432 cifs_dbg(FYI, "%s: default to last target server: %s\n", __func__,
433 server->hostname);
434 }
435 }
436 /* resolve the hostname again to make sure that IP address is up-to-date. */
437 rc = reconn_set_ipaddr_from_hostname(server);
438 cifs_dbg(FYI, "%s: reconn_set_ipaddr_from_hostname: rc=%d\n", __func__, rc);
439 }
440 /* Reconnect the socket */
441 if (cifs_rdma_enabled(server))
442 rc = smbd_reconnect(server);
443 else
444 rc = generic_ip_connect(server);
445
446 return rc;
447}
448
449static int reconnect_target_unlocked(struct TCP_Server_Info *server, struct dfs_cache_tgt_list *tl,
450 struct dfs_cache_tgt_iterator **target_hint)
451{
452 int rc;
453 struct dfs_cache_tgt_iterator *tit;
454
455 *target_hint = NULL;
456
457 /* If dfs target list is empty, then reconnect to last server */
458 tit = dfs_cache_get_tgt_iterator(tl);
459 if (!tit)
460 return __reconnect_target_unlocked(server, server->hostname);
461
462 /* Otherwise, try every dfs target in @tl */
463 for (; tit; tit = dfs_cache_get_next_tgt(tl, tit)) {
464 rc = __reconnect_target_unlocked(server, dfs_cache_get_tgt_name(tit));
465 if (!rc) {
466 *target_hint = tit;
467 break;
468 }
469 }
470 return rc;
471}
472
473static int reconnect_dfs_server(struct TCP_Server_Info *server)
474{
475 int rc = 0;
476 const char *refpath = server->current_fullpath + 1;
477 struct dfs_cache_tgt_list tl = DFS_CACHE_TGT_LIST_INIT(tl);
478 struct dfs_cache_tgt_iterator *target_hint = NULL;
479 int num_targets = 0;
480
481 /*
482 * Determine the number of dfs targets the referral path in @cifs_sb resolves to.
483 *
484 * smb2_reconnect() needs to know how long it should wait based upon the number of dfs
485 * targets (server->nr_targets). It's also possible that the cached referral was cleared
486 * through /proc/fs/cifs/dfscache or the target list is empty due to server settings after
487 * refreshing the referral, so, in this case, default it to 1.
488 */
489 if (!dfs_cache_noreq_find(refpath, NULL, &tl))
490 num_targets = dfs_cache_get_nr_tgts(&tl);
491 if (!num_targets)
492 num_targets = 1;
493
494 if (!cifs_tcp_ses_needs_reconnect(server, num_targets))
495 return 0;
496
497 /*
498 * Unconditionally mark all sessions & tcons for reconnect as we might be connecting to a
499 * different server or share during failover. It could be improved by adding some logic to
500 * only do that in case it connects to a different server or share, though.
501 */
502 cifs_mark_tcp_ses_conns_for_reconnect(server, true);
503
504 cifs_abort_connection(server);
505
506 do {
507 try_to_freeze();
508 cifs_server_lock(server);
509
510 rc = reconnect_target_unlocked(server, &tl, &target_hint);
511 if (rc) {
512 /* Failed to reconnect socket */
513 cifs_server_unlock(server);
514 cifs_dbg(FYI, "%s: reconnect error %d\n", __func__, rc);
515 msleep(3000);
516 continue;
517 }
518 /*
519 * Socket was created. Update tcp session status to CifsNeedNegotiate so that a
520 * process waiting for reconnect will know it needs to re-establish session and tcon
521 * through the reconnected target server.
522 */
523 atomic_inc(&tcpSesReconnectCount);
524 set_credits(server, 1);
525 spin_lock(&server->srv_lock);
526 if (server->tcpStatus != CifsExiting)
527 server->tcpStatus = CifsNeedNegotiate;
528 spin_unlock(&server->srv_lock);
529 cifs_swn_reset_server_dstaddr(server);
530 cifs_server_unlock(server);
531 mod_delayed_work(cifsiod_wq, &server->reconnect, 0);
532 } while (server->tcpStatus == CifsNeedReconnect);
533
534 dfs_cache_noreq_update_tgthint(refpath, target_hint);
535 dfs_cache_free_tgts(&tl);
536
537 /* Need to set up echo worker again once connection has been established */
538 spin_lock(&server->srv_lock);
539 if (server->tcpStatus == CifsNeedNegotiate)
540 mod_delayed_work(cifsiod_wq, &server->echo, 0);
541 spin_unlock(&server->srv_lock);
542
543 wake_up(&server->response_q);
544 return rc;
545}
546
547int cifs_reconnect(struct TCP_Server_Info *server, bool mark_smb_session)
548{
549 mutex_lock(&server->refpath_lock);
550 if (!server->leaf_fullpath) {
551 mutex_unlock(&server->refpath_lock);
552 return __cifs_reconnect(server, mark_smb_session);
553 }
554 mutex_unlock(&server->refpath_lock);
555
556 return reconnect_dfs_server(server);
557}
558#else
559int cifs_reconnect(struct TCP_Server_Info *server, bool mark_smb_session)
560{
561 return __cifs_reconnect(server, mark_smb_session);
562}
563#endif
564
565static void
566cifs_echo_request(struct work_struct *work)
567{
568 int rc;
569 struct TCP_Server_Info *server = container_of(work,
570 struct TCP_Server_Info, echo.work);
571
572 /*
573 * We cannot send an echo if it is disabled.
574 * Also, no need to ping if we got a response recently.
575 */
576
577 if (server->tcpStatus == CifsNeedReconnect ||
578 server->tcpStatus == CifsExiting ||
579 server->tcpStatus == CifsNew ||
580 (server->ops->can_echo && !server->ops->can_echo(server)) ||
581 time_before(jiffies, server->lstrp + server->echo_interval - HZ))
582 goto requeue_echo;
583
584 rc = server->ops->echo ? server->ops->echo(server) : -ENOSYS;
585 if (rc)
586 cifs_dbg(FYI, "Unable to send echo request to server: %s\n",
587 server->hostname);
588
589 /* Check witness registrations */
590 cifs_swn_check();
591
592requeue_echo:
593 queue_delayed_work(cifsiod_wq, &server->echo, server->echo_interval);
594}
595
596static bool
597allocate_buffers(struct TCP_Server_Info *server)
598{
599 if (!server->bigbuf) {
600 server->bigbuf = (char *)cifs_buf_get();
601 if (!server->bigbuf) {
602 cifs_server_dbg(VFS, "No memory for large SMB response\n");
603 msleep(3000);
604 /* retry will check if exiting */
605 return false;
606 }
607 } else if (server->large_buf) {
608 /* we are reusing a dirty large buf, clear its start */
609 memset(server->bigbuf, 0, HEADER_SIZE(server));
610 }
611
612 if (!server->smallbuf) {
613 server->smallbuf = (char *)cifs_small_buf_get();
614 if (!server->smallbuf) {
615 cifs_server_dbg(VFS, "No memory for SMB response\n");
616 msleep(1000);
617 /* retry will check if exiting */
618 return false;
619 }
620 /* beginning of smb buffer is cleared in our buf_get */
621 } else {
622 /* if existing small buf clear beginning */
623 memset(server->smallbuf, 0, HEADER_SIZE(server));
624 }
625
626 return true;
627}
628
629static bool
630server_unresponsive(struct TCP_Server_Info *server)
631{
632 /*
633 * We need to wait 3 echo intervals to make sure we handle such
634 * situations right:
635 * 1s client sends a normal SMB request
636 * 2s client gets a response
637 * 30s echo workqueue job pops, and decides we got a response recently
638 * and don't need to send another
639 * ...
640 * 65s kernel_recvmsg times out, and we see that we haven't gotten
641 * a response in >60s.
642 */
643 spin_lock(&server->srv_lock);
644 if ((server->tcpStatus == CifsGood ||
645 server->tcpStatus == CifsNeedNegotiate) &&
646 (!server->ops->can_echo || server->ops->can_echo(server)) &&
647 time_after(jiffies, server->lstrp + 3 * server->echo_interval)) {
648 spin_unlock(&server->srv_lock);
649 cifs_server_dbg(VFS, "has not responded in %lu seconds. Reconnecting...\n",
650 (3 * server->echo_interval) / HZ);
651 cifs_reconnect(server, false);
652 return true;
653 }
654 spin_unlock(&server->srv_lock);
655
656 return false;
657}
658
659static inline bool
660zero_credits(struct TCP_Server_Info *server)
661{
662 int val;
663
664 spin_lock(&server->req_lock);
665 val = server->credits + server->echo_credits + server->oplock_credits;
666 if (server->in_flight == 0 && val == 0) {
667 spin_unlock(&server->req_lock);
668 return true;
669 }
670 spin_unlock(&server->req_lock);
671 return false;
672}
673
674static int
675cifs_readv_from_socket(struct TCP_Server_Info *server, struct msghdr *smb_msg)
676{
677 int length = 0;
678 int total_read;
679
680 for (total_read = 0; msg_data_left(smb_msg); total_read += length) {
681 try_to_freeze();
682
683 /* reconnect if no credits and no requests in flight */
684 if (zero_credits(server)) {
685 cifs_reconnect(server, false);
686 return -ECONNABORTED;
687 }
688
689 if (server_unresponsive(server))
690 return -ECONNABORTED;
691 if (cifs_rdma_enabled(server) && server->smbd_conn)
692 length = smbd_recv(server->smbd_conn, smb_msg);
693 else
694 length = sock_recvmsg(server->ssocket, smb_msg, 0);
695
696 spin_lock(&server->srv_lock);
697 if (server->tcpStatus == CifsExiting) {
698 spin_unlock(&server->srv_lock);
699 return -ESHUTDOWN;
700 }
701
702 if (server->tcpStatus == CifsNeedReconnect) {
703 spin_unlock(&server->srv_lock);
704 cifs_reconnect(server, false);
705 return -ECONNABORTED;
706 }
707 spin_unlock(&server->srv_lock);
708
709 if (length == -ERESTARTSYS ||
710 length == -EAGAIN ||
711 length == -EINTR) {
712 /*
713 * Minimum sleep to prevent looping, allowing socket
714 * to clear and app threads to set tcpStatus
715 * CifsNeedReconnect if server hung.
716 */
717 usleep_range(1000, 2000);
718 length = 0;
719 continue;
720 }
721
722 if (length <= 0) {
723 cifs_dbg(FYI, "Received no data or error: %d\n", length);
724 cifs_reconnect(server, false);
725 return -ECONNABORTED;
726 }
727 }
728 return total_read;
729}
730
731int
732cifs_read_from_socket(struct TCP_Server_Info *server, char *buf,
733 unsigned int to_read)
734{
735 struct msghdr smb_msg = {};
736 struct kvec iov = {.iov_base = buf, .iov_len = to_read};
737 iov_iter_kvec(&smb_msg.msg_iter, ITER_DEST, &iov, 1, to_read);
738
739 return cifs_readv_from_socket(server, &smb_msg);
740}
741
742ssize_t
743cifs_discard_from_socket(struct TCP_Server_Info *server, size_t to_read)
744{
745 struct msghdr smb_msg = {};
746
747 /*
748 * iov_iter_discard already sets smb_msg.type and count and iov_offset
749 * and cifs_readv_from_socket sets msg_control and msg_controllen
750 * so little to initialize in struct msghdr
751 */
752 iov_iter_discard(&smb_msg.msg_iter, ITER_DEST, to_read);
753
754 return cifs_readv_from_socket(server, &smb_msg);
755}
756
757int
758cifs_read_page_from_socket(struct TCP_Server_Info *server, struct page *page,
759 unsigned int page_offset, unsigned int to_read)
760{
761 struct msghdr smb_msg = {};
762 struct bio_vec bv = {
763 .bv_page = page, .bv_len = to_read, .bv_offset = page_offset};
764 iov_iter_bvec(&smb_msg.msg_iter, ITER_DEST, &bv, 1, to_read);
765 return cifs_readv_from_socket(server, &smb_msg);
766}
767
768static bool
769is_smb_response(struct TCP_Server_Info *server, unsigned char type)
770{
771 /*
772 * The first byte big endian of the length field,
773 * is actually not part of the length but the type
774 * with the most common, zero, as regular data.
775 */
776 switch (type) {
777 case RFC1002_SESSION_MESSAGE:
778 /* Regular SMB response */
779 return true;
780 case RFC1002_SESSION_KEEP_ALIVE:
781 cifs_dbg(FYI, "RFC 1002 session keep alive\n");
782 break;
783 case RFC1002_POSITIVE_SESSION_RESPONSE:
784 cifs_dbg(FYI, "RFC 1002 positive session response\n");
785 break;
786 case RFC1002_NEGATIVE_SESSION_RESPONSE:
787 /*
788 * We get this from Windows 98 instead of an error on
789 * SMB negprot response.
790 */
791 cifs_dbg(FYI, "RFC 1002 negative session response\n");
792 /* give server a second to clean up */
793 msleep(1000);
794 /*
795 * Always try 445 first on reconnect since we get NACK
796 * on some if we ever connected to port 139 (the NACK
797 * is since we do not begin with RFC1001 session
798 * initialize frame).
799 */
800 cifs_set_port((struct sockaddr *)&server->dstaddr, CIFS_PORT);
801 cifs_reconnect(server, true);
802 break;
803 default:
804 cifs_server_dbg(VFS, "RFC 1002 unknown response type 0x%x\n", type);
805 cifs_reconnect(server, true);
806 }
807
808 return false;
809}
810
811void
812dequeue_mid(struct mid_q_entry *mid, bool malformed)
813{
814#ifdef CONFIG_CIFS_STATS2
815 mid->when_received = jiffies;
816#endif
817 spin_lock(&mid->server->mid_lock);
818 if (!malformed)
819 mid->mid_state = MID_RESPONSE_RECEIVED;
820 else
821 mid->mid_state = MID_RESPONSE_MALFORMED;
822 /*
823 * Trying to handle/dequeue a mid after the send_recv()
824 * function has finished processing it is a bug.
825 */
826 if (mid->mid_flags & MID_DELETED) {
827 spin_unlock(&mid->server->mid_lock);
828 pr_warn_once("trying to dequeue a deleted mid\n");
829 } else {
830 list_del_init(&mid->qhead);
831 mid->mid_flags |= MID_DELETED;
832 spin_unlock(&mid->server->mid_lock);
833 }
834}
835
836static unsigned int
837smb2_get_credits_from_hdr(char *buffer, struct TCP_Server_Info *server)
838{
839 struct smb2_hdr *shdr = (struct smb2_hdr *)buffer;
840
841 /*
842 * SMB1 does not use credits.
843 */
844 if (is_smb1(server))
845 return 0;
846
847 return le16_to_cpu(shdr->CreditRequest);
848}
849
850static void
851handle_mid(struct mid_q_entry *mid, struct TCP_Server_Info *server,
852 char *buf, int malformed)
853{
854 if (server->ops->check_trans2 &&
855 server->ops->check_trans2(mid, server, buf, malformed))
856 return;
857 mid->credits_received = smb2_get_credits_from_hdr(buf, server);
858 mid->resp_buf = buf;
859 mid->large_buf = server->large_buf;
860 /* Was previous buf put in mpx struct for multi-rsp? */
861 if (!mid->multiRsp) {
862 /* smb buffer will be freed by user thread */
863 if (server->large_buf)
864 server->bigbuf = NULL;
865 else
866 server->smallbuf = NULL;
867 }
868 dequeue_mid(mid, malformed);
869}
870
871int
872cifs_enable_signing(struct TCP_Server_Info *server, bool mnt_sign_required)
873{
874 bool srv_sign_required = server->sec_mode & server->vals->signing_required;
875 bool srv_sign_enabled = server->sec_mode & server->vals->signing_enabled;
876 bool mnt_sign_enabled;
877
878 /*
879 * Is signing required by mnt options? If not then check
880 * global_secflags to see if it is there.
881 */
882 if (!mnt_sign_required)
883 mnt_sign_required = ((global_secflags & CIFSSEC_MUST_SIGN) ==
884 CIFSSEC_MUST_SIGN);
885
886 /*
887 * If signing is required then it's automatically enabled too,
888 * otherwise, check to see if the secflags allow it.
889 */
890 mnt_sign_enabled = mnt_sign_required ? mnt_sign_required :
891 (global_secflags & CIFSSEC_MAY_SIGN);
892
893 /* If server requires signing, does client allow it? */
894 if (srv_sign_required) {
895 if (!mnt_sign_enabled) {
896 cifs_dbg(VFS, "Server requires signing, but it's disabled in SecurityFlags!\n");
897 return -EOPNOTSUPP;
898 }
899 server->sign = true;
900 }
901
902 /* If client requires signing, does server allow it? */
903 if (mnt_sign_required) {
904 if (!srv_sign_enabled) {
905 cifs_dbg(VFS, "Server does not support signing!\n");
906 return -EOPNOTSUPP;
907 }
908 server->sign = true;
909 }
910
911 if (cifs_rdma_enabled(server) && server->sign)
912 cifs_dbg(VFS, "Signing is enabled, and RDMA read/write will be disabled\n");
913
914 return 0;
915}
916
917
918static void clean_demultiplex_info(struct TCP_Server_Info *server)
919{
920 int length;
921
922 /* take it off the list, if it's not already */
923 spin_lock(&server->srv_lock);
924 list_del_init(&server->tcp_ses_list);
925 spin_unlock(&server->srv_lock);
926
927 cancel_delayed_work_sync(&server->echo);
928 cancel_delayed_work_sync(&server->resolve);
929
930 spin_lock(&server->srv_lock);
931 server->tcpStatus = CifsExiting;
932 spin_unlock(&server->srv_lock);
933 wake_up_all(&server->response_q);
934
935 /* check if we have blocked requests that need to free */
936 spin_lock(&server->req_lock);
937 if (server->credits <= 0)
938 server->credits = 1;
939 spin_unlock(&server->req_lock);
940 /*
941 * Although there should not be any requests blocked on this queue it
942 * can not hurt to be paranoid and try to wake up requests that may
943 * haven been blocked when more than 50 at time were on the wire to the
944 * same server - they now will see the session is in exit state and get
945 * out of SendReceive.
946 */
947 wake_up_all(&server->request_q);
948 /* give those requests time to exit */
949 msleep(125);
950 if (cifs_rdma_enabled(server))
951 smbd_destroy(server);
952 if (server->ssocket) {
953 sock_release(server->ssocket);
954 server->ssocket = NULL;
955 }
956
957 if (!list_empty(&server->pending_mid_q)) {
958 struct list_head dispose_list;
959 struct mid_q_entry *mid_entry;
960 struct list_head *tmp, *tmp2;
961
962 INIT_LIST_HEAD(&dispose_list);
963 spin_lock(&server->mid_lock);
964 list_for_each_safe(tmp, tmp2, &server->pending_mid_q) {
965 mid_entry = list_entry(tmp, struct mid_q_entry, qhead);
966 cifs_dbg(FYI, "Clearing mid %llu\n", mid_entry->mid);
967 kref_get(&mid_entry->refcount);
968 mid_entry->mid_state = MID_SHUTDOWN;
969 list_move(&mid_entry->qhead, &dispose_list);
970 mid_entry->mid_flags |= MID_DELETED;
971 }
972 spin_unlock(&server->mid_lock);
973
974 /* now walk dispose list and issue callbacks */
975 list_for_each_safe(tmp, tmp2, &dispose_list) {
976 mid_entry = list_entry(tmp, struct mid_q_entry, qhead);
977 cifs_dbg(FYI, "Callback mid %llu\n", mid_entry->mid);
978 list_del_init(&mid_entry->qhead);
979 mid_entry->callback(mid_entry);
980 release_mid(mid_entry);
981 }
982 /* 1/8th of sec is more than enough time for them to exit */
983 msleep(125);
984 }
985
986 if (!list_empty(&server->pending_mid_q)) {
987 /*
988 * mpx threads have not exited yet give them at least the smb
989 * send timeout time for long ops.
990 *
991 * Due to delays on oplock break requests, we need to wait at
992 * least 45 seconds before giving up on a request getting a
993 * response and going ahead and killing cifsd.
994 */
995 cifs_dbg(FYI, "Wait for exit from demultiplex thread\n");
996 msleep(46000);
997 /*
998 * If threads still have not exited they are probably never
999 * coming home not much else we can do but free the memory.
1000 */
1001 }
1002
1003#ifdef CONFIG_CIFS_DFS_UPCALL
1004 kfree(server->origin_fullpath);
1005 kfree(server->leaf_fullpath);
1006#endif
1007 kfree(server);
1008
1009 length = atomic_dec_return(&tcpSesAllocCount);
1010 if (length > 0)
1011 mempool_resize(cifs_req_poolp, length + cifs_min_rcv);
1012}
1013
1014static int
1015standard_receive3(struct TCP_Server_Info *server, struct mid_q_entry *mid)
1016{
1017 int length;
1018 char *buf = server->smallbuf;
1019 unsigned int pdu_length = server->pdu_size;
1020
1021 /* make sure this will fit in a large buffer */
1022 if (pdu_length > CIFSMaxBufSize + MAX_HEADER_SIZE(server) -
1023 HEADER_PREAMBLE_SIZE(server)) {
1024 cifs_server_dbg(VFS, "SMB response too long (%u bytes)\n", pdu_length);
1025 cifs_reconnect(server, true);
1026 return -ECONNABORTED;
1027 }
1028
1029 /* switch to large buffer if too big for a small one */
1030 if (pdu_length > MAX_CIFS_SMALL_BUFFER_SIZE - 4) {
1031 server->large_buf = true;
1032 memcpy(server->bigbuf, buf, server->total_read);
1033 buf = server->bigbuf;
1034 }
1035
1036 /* now read the rest */
1037 length = cifs_read_from_socket(server, buf + HEADER_SIZE(server) - 1,
1038 pdu_length - MID_HEADER_SIZE(server));
1039
1040 if (length < 0)
1041 return length;
1042 server->total_read += length;
1043
1044 dump_smb(buf, server->total_read);
1045
1046 return cifs_handle_standard(server, mid);
1047}
1048
1049int
1050cifs_handle_standard(struct TCP_Server_Info *server, struct mid_q_entry *mid)
1051{
1052 char *buf = server->large_buf ? server->bigbuf : server->smallbuf;
1053 int rc;
1054
1055 /*
1056 * We know that we received enough to get to the MID as we
1057 * checked the pdu_length earlier. Now check to see
1058 * if the rest of the header is OK.
1059 *
1060 * 48 bytes is enough to display the header and a little bit
1061 * into the payload for debugging purposes.
1062 */
1063 rc = server->ops->check_message(buf, server->total_read, server);
1064 if (rc)
1065 cifs_dump_mem("Bad SMB: ", buf,
1066 min_t(unsigned int, server->total_read, 48));
1067
1068 if (server->ops->is_session_expired &&
1069 server->ops->is_session_expired(buf)) {
1070 cifs_reconnect(server, true);
1071 return -1;
1072 }
1073
1074 if (server->ops->is_status_pending &&
1075 server->ops->is_status_pending(buf, server))
1076 return -1;
1077
1078 if (!mid)
1079 return rc;
1080
1081 handle_mid(mid, server, buf, rc);
1082 return 0;
1083}
1084
1085static void
1086smb2_add_credits_from_hdr(char *buffer, struct TCP_Server_Info *server)
1087{
1088 struct smb2_hdr *shdr = (struct smb2_hdr *)buffer;
1089 int scredits, in_flight;
1090
1091 /*
1092 * SMB1 does not use credits.
1093 */
1094 if (is_smb1(server))
1095 return;
1096
1097 if (shdr->CreditRequest) {
1098 spin_lock(&server->req_lock);
1099 server->credits += le16_to_cpu(shdr->CreditRequest);
1100 scredits = server->credits;
1101 in_flight = server->in_flight;
1102 spin_unlock(&server->req_lock);
1103 wake_up(&server->request_q);
1104
1105 trace_smb3_hdr_credits(server->CurrentMid,
1106 server->conn_id, server->hostname, scredits,
1107 le16_to_cpu(shdr->CreditRequest), in_flight);
1108 cifs_server_dbg(FYI, "%s: added %u credits total=%d\n",
1109 __func__, le16_to_cpu(shdr->CreditRequest),
1110 scredits);
1111 }
1112}
1113
1114
1115static int
1116cifs_demultiplex_thread(void *p)
1117{
1118 int i, num_mids, length;
1119 struct TCP_Server_Info *server = p;
1120 unsigned int pdu_length;
1121 unsigned int next_offset;
1122 char *buf = NULL;
1123 struct task_struct *task_to_wake = NULL;
1124 struct mid_q_entry *mids[MAX_COMPOUND];
1125 char *bufs[MAX_COMPOUND];
1126 unsigned int noreclaim_flag, num_io_timeout = 0;
1127
1128 noreclaim_flag = memalloc_noreclaim_save();
1129 cifs_dbg(FYI, "Demultiplex PID: %d\n", task_pid_nr(current));
1130
1131 length = atomic_inc_return(&tcpSesAllocCount);
1132 if (length > 1)
1133 mempool_resize(cifs_req_poolp, length + cifs_min_rcv);
1134
1135 set_freezable();
1136 allow_kernel_signal(SIGKILL);
1137 while (server->tcpStatus != CifsExiting) {
1138 if (try_to_freeze())
1139 continue;
1140
1141 if (!allocate_buffers(server))
1142 continue;
1143
1144 server->large_buf = false;
1145 buf = server->smallbuf;
1146 pdu_length = 4; /* enough to get RFC1001 header */
1147
1148 length = cifs_read_from_socket(server, buf, pdu_length);
1149 if (length < 0)
1150 continue;
1151
1152 if (is_smb1(server))
1153 server->total_read = length;
1154 else
1155 server->total_read = 0;
1156
1157 /*
1158 * The right amount was read from socket - 4 bytes,
1159 * so we can now interpret the length field.
1160 */
1161 pdu_length = get_rfc1002_length(buf);
1162
1163 cifs_dbg(FYI, "RFC1002 header 0x%x\n", pdu_length);
1164 if (!is_smb_response(server, buf[0]))
1165 continue;
1166next_pdu:
1167 server->pdu_size = pdu_length;
1168
1169 /* make sure we have enough to get to the MID */
1170 if (server->pdu_size < MID_HEADER_SIZE(server)) {
1171 cifs_server_dbg(VFS, "SMB response too short (%u bytes)\n",
1172 server->pdu_size);
1173 cifs_reconnect(server, true);
1174 continue;
1175 }
1176
1177 /* read down to the MID */
1178 length = cifs_read_from_socket(server,
1179 buf + HEADER_PREAMBLE_SIZE(server),
1180 MID_HEADER_SIZE(server));
1181 if (length < 0)
1182 continue;
1183 server->total_read += length;
1184
1185 if (server->ops->next_header) {
1186 next_offset = server->ops->next_header(buf);
1187 if (next_offset)
1188 server->pdu_size = next_offset;
1189 }
1190
1191 memset(mids, 0, sizeof(mids));
1192 memset(bufs, 0, sizeof(bufs));
1193 num_mids = 0;
1194
1195 if (server->ops->is_transform_hdr &&
1196 server->ops->receive_transform &&
1197 server->ops->is_transform_hdr(buf)) {
1198 length = server->ops->receive_transform(server,
1199 mids,
1200 bufs,
1201 &num_mids);
1202 } else {
1203 mids[0] = server->ops->find_mid(server, buf);
1204 bufs[0] = buf;
1205 num_mids = 1;
1206
1207 if (!mids[0] || !mids[0]->receive)
1208 length = standard_receive3(server, mids[0]);
1209 else
1210 length = mids[0]->receive(server, mids[0]);
1211 }
1212
1213 if (length < 0) {
1214 for (i = 0; i < num_mids; i++)
1215 if (mids[i])
1216 release_mid(mids[i]);
1217 continue;
1218 }
1219
1220 if (server->ops->is_status_io_timeout &&
1221 server->ops->is_status_io_timeout(buf)) {
1222 num_io_timeout++;
1223 if (num_io_timeout > NUM_STATUS_IO_TIMEOUT) {
1224 cifs_reconnect(server, false);
1225 num_io_timeout = 0;
1226 continue;
1227 }
1228 }
1229
1230 server->lstrp = jiffies;
1231
1232 for (i = 0; i < num_mids; i++) {
1233 if (mids[i] != NULL) {
1234 mids[i]->resp_buf_size = server->pdu_size;
1235
1236 if (bufs[i] && server->ops->is_network_name_deleted)
1237 server->ops->is_network_name_deleted(bufs[i],
1238 server);
1239
1240 if (!mids[i]->multiRsp || mids[i]->multiEnd)
1241 mids[i]->callback(mids[i]);
1242
1243 release_mid(mids[i]);
1244 } else if (server->ops->is_oplock_break &&
1245 server->ops->is_oplock_break(bufs[i],
1246 server)) {
1247 smb2_add_credits_from_hdr(bufs[i], server);
1248 cifs_dbg(FYI, "Received oplock break\n");
1249 } else {
1250 cifs_server_dbg(VFS, "No task to wake, unknown frame received! NumMids %d\n",
1251 atomic_read(&mid_count));
1252 cifs_dump_mem("Received Data is: ", bufs[i],
1253 HEADER_SIZE(server));
1254 smb2_add_credits_from_hdr(bufs[i], server);
1255#ifdef CONFIG_CIFS_DEBUG2
1256 if (server->ops->dump_detail)
1257 server->ops->dump_detail(bufs[i],
1258 server);
1259 cifs_dump_mids(server);
1260#endif /* CIFS_DEBUG2 */
1261 }
1262 }
1263
1264 if (pdu_length > server->pdu_size) {
1265 if (!allocate_buffers(server))
1266 continue;
1267 pdu_length -= server->pdu_size;
1268 server->total_read = 0;
1269 server->large_buf = false;
1270 buf = server->smallbuf;
1271 goto next_pdu;
1272 }
1273 } /* end while !EXITING */
1274
1275 /* buffer usually freed in free_mid - need to free it here on exit */
1276 cifs_buf_release(server->bigbuf);
1277 if (server->smallbuf) /* no sense logging a debug message if NULL */
1278 cifs_small_buf_release(server->smallbuf);
1279
1280 task_to_wake = xchg(&server->tsk, NULL);
1281 clean_demultiplex_info(server);
1282
1283 /* if server->tsk was NULL then wait for a signal before exiting */
1284 if (!task_to_wake) {
1285 set_current_state(TASK_INTERRUPTIBLE);
1286 while (!signal_pending(current)) {
1287 schedule();
1288 set_current_state(TASK_INTERRUPTIBLE);
1289 }
1290 set_current_state(TASK_RUNNING);
1291 }
1292
1293 memalloc_noreclaim_restore(noreclaim_flag);
1294 module_put_and_kthread_exit(0);
1295}
1296
1297/*
1298 * Returns true if srcaddr isn't specified and rhs isn't specified, or
1299 * if srcaddr is specified and matches the IP address of the rhs argument
1300 */
1301bool
1302cifs_match_ipaddr(struct sockaddr *srcaddr, struct sockaddr *rhs)
1303{
1304 switch (srcaddr->sa_family) {
1305 case AF_UNSPEC:
1306 return (rhs->sa_family == AF_UNSPEC);
1307 case AF_INET: {
1308 struct sockaddr_in *saddr4 = (struct sockaddr_in *)srcaddr;
1309 struct sockaddr_in *vaddr4 = (struct sockaddr_in *)rhs;
1310 return (saddr4->sin_addr.s_addr == vaddr4->sin_addr.s_addr);
1311 }
1312 case AF_INET6: {
1313 struct sockaddr_in6 *saddr6 = (struct sockaddr_in6 *)srcaddr;
1314 struct sockaddr_in6 *vaddr6 = (struct sockaddr_in6 *)rhs;
1315 return ipv6_addr_equal(&saddr6->sin6_addr, &vaddr6->sin6_addr);
1316 }
1317 default:
1318 WARN_ON(1);
1319 return false; /* don't expect to be here */
1320 }
1321}
1322
1323/*
1324 * If no port is specified in addr structure, we try to match with 445 port
1325 * and if it fails - with 139 ports. It should be called only if address
1326 * families of server and addr are equal.
1327 */
1328static bool
1329match_port(struct TCP_Server_Info *server, struct sockaddr *addr)
1330{
1331 __be16 port, *sport;
1332
1333 /* SMBDirect manages its own ports, don't match it here */
1334 if (server->rdma)
1335 return true;
1336
1337 switch (addr->sa_family) {
1338 case AF_INET:
1339 sport = &((struct sockaddr_in *) &server->dstaddr)->sin_port;
1340 port = ((struct sockaddr_in *) addr)->sin_port;
1341 break;
1342 case AF_INET6:
1343 sport = &((struct sockaddr_in6 *) &server->dstaddr)->sin6_port;
1344 port = ((struct sockaddr_in6 *) addr)->sin6_port;
1345 break;
1346 default:
1347 WARN_ON(1);
1348 return false;
1349 }
1350
1351 if (!port) {
1352 port = htons(CIFS_PORT);
1353 if (port == *sport)
1354 return true;
1355
1356 port = htons(RFC1001_PORT);
1357 }
1358
1359 return port == *sport;
1360}
1361
1362static bool match_server_address(struct TCP_Server_Info *server, struct sockaddr *addr)
1363{
1364 switch (addr->sa_family) {
1365 case AF_INET: {
1366 struct sockaddr_in *addr4 = (struct sockaddr_in *)addr;
1367 struct sockaddr_in *srv_addr4 =
1368 (struct sockaddr_in *)&server->dstaddr;
1369
1370 if (addr4->sin_addr.s_addr != srv_addr4->sin_addr.s_addr)
1371 return false;
1372 break;
1373 }
1374 case AF_INET6: {
1375 struct sockaddr_in6 *addr6 = (struct sockaddr_in6 *)addr;
1376 struct sockaddr_in6 *srv_addr6 =
1377 (struct sockaddr_in6 *)&server->dstaddr;
1378
1379 if (!ipv6_addr_equal(&addr6->sin6_addr,
1380 &srv_addr6->sin6_addr))
1381 return false;
1382 if (addr6->sin6_scope_id != srv_addr6->sin6_scope_id)
1383 return false;
1384 break;
1385 }
1386 default:
1387 WARN_ON(1);
1388 return false; /* don't expect to be here */
1389 }
1390
1391 return true;
1392}
1393
1394static bool
1395match_security(struct TCP_Server_Info *server, struct smb3_fs_context *ctx)
1396{
1397 /*
1398 * The select_sectype function should either return the ctx->sectype
1399 * that was specified, or "Unspecified" if that sectype was not
1400 * compatible with the given NEGOTIATE request.
1401 */
1402 if (server->ops->select_sectype(server, ctx->sectype)
1403 == Unspecified)
1404 return false;
1405
1406 /*
1407 * Now check if signing mode is acceptable. No need to check
1408 * global_secflags at this point since if MUST_SIGN is set then
1409 * the server->sign had better be too.
1410 */
1411 if (ctx->sign && !server->sign)
1412 return false;
1413
1414 return true;
1415}
1416
1417static bool dfs_src_pathname_equal(const char *s1, const char *s2)
1418{
1419 if (strlen(s1) != strlen(s2))
1420 return false;
1421 for (; *s1; s1++, s2++) {
1422 if (*s1 == '/' || *s1 == '\\') {
1423 if (*s2 != '/' && *s2 != '\\')
1424 return false;
1425 } else if (tolower(*s1) != tolower(*s2))
1426 return false;
1427 }
1428 return true;
1429}
1430
1431/* this function must be called with srv_lock held */
1432static int match_server(struct TCP_Server_Info *server, struct smb3_fs_context *ctx,
1433 bool dfs_super_cmp)
1434{
1435 struct sockaddr *addr = (struct sockaddr *)&ctx->dstaddr;
1436
1437 if (ctx->nosharesock)
1438 return 0;
1439
1440 /* this server does not share socket */
1441 if (server->nosharesock)
1442 return 0;
1443
1444 /* If multidialect negotiation see if existing sessions match one */
1445 if (strcmp(ctx->vals->version_string, SMB3ANY_VERSION_STRING) == 0) {
1446 if (server->vals->protocol_id < SMB30_PROT_ID)
1447 return 0;
1448 } else if (strcmp(ctx->vals->version_string,
1449 SMBDEFAULT_VERSION_STRING) == 0) {
1450 if (server->vals->protocol_id < SMB21_PROT_ID)
1451 return 0;
1452 } else if ((server->vals != ctx->vals) || (server->ops != ctx->ops))
1453 return 0;
1454
1455 if (!net_eq(cifs_net_ns(server), current->nsproxy->net_ns))
1456 return 0;
1457
1458 if (!cifs_match_ipaddr((struct sockaddr *)&ctx->srcaddr,
1459 (struct sockaddr *)&server->srcaddr))
1460 return 0;
1461 /*
1462 * When matching DFS superblocks, we only check for original source pathname as the
1463 * currently connected target might be different than the one parsed earlier in i.e.
1464 * mount.cifs(8).
1465 */
1466 if (dfs_super_cmp) {
1467 if (!ctx->source || !server->origin_fullpath ||
1468 !dfs_src_pathname_equal(server->origin_fullpath, ctx->source))
1469 return 0;
1470 } else {
1471 /* Skip addr, hostname and port matching for DFS connections */
1472 if (server->leaf_fullpath) {
1473 if (!ctx->leaf_fullpath ||
1474 strcasecmp(server->leaf_fullpath, ctx->leaf_fullpath))
1475 return 0;
1476 } else if (strcasecmp(server->hostname, ctx->server_hostname) ||
1477 !match_server_address(server, addr) ||
1478 !match_port(server, addr)) {
1479 return 0;
1480 }
1481 }
1482
1483 if (!match_security(server, ctx))
1484 return 0;
1485
1486 if (server->echo_interval != ctx->echo_interval * HZ)
1487 return 0;
1488
1489 if (server->rdma != ctx->rdma)
1490 return 0;
1491
1492 if (server->ignore_signature != ctx->ignore_signature)
1493 return 0;
1494
1495 if (server->min_offload != ctx->min_offload)
1496 return 0;
1497
1498 return 1;
1499}
1500
1501struct TCP_Server_Info *
1502cifs_find_tcp_session(struct smb3_fs_context *ctx)
1503{
1504 struct TCP_Server_Info *server;
1505
1506 spin_lock(&cifs_tcp_ses_lock);
1507 list_for_each_entry(server, &cifs_tcp_ses_list, tcp_ses_list) {
1508 spin_lock(&server->srv_lock);
1509 /*
1510 * Skip ses channels since they're only handled in lower layers
1511 * (e.g. cifs_send_recv).
1512 */
1513 if (CIFS_SERVER_IS_CHAN(server) || !match_server(server, ctx, false)) {
1514 spin_unlock(&server->srv_lock);
1515 continue;
1516 }
1517 spin_unlock(&server->srv_lock);
1518
1519 ++server->srv_count;
1520 spin_unlock(&cifs_tcp_ses_lock);
1521 cifs_dbg(FYI, "Existing tcp session with server found\n");
1522 return server;
1523 }
1524 spin_unlock(&cifs_tcp_ses_lock);
1525 return NULL;
1526}
1527
1528void
1529cifs_put_tcp_session(struct TCP_Server_Info *server, int from_reconnect)
1530{
1531 struct task_struct *task;
1532
1533 spin_lock(&cifs_tcp_ses_lock);
1534 if (--server->srv_count > 0) {
1535 spin_unlock(&cifs_tcp_ses_lock);
1536 return;
1537 }
1538
1539 /* srv_count can never go negative */
1540 WARN_ON(server->srv_count < 0);
1541
1542 put_net(cifs_net_ns(server));
1543
1544 list_del_init(&server->tcp_ses_list);
1545 spin_unlock(&cifs_tcp_ses_lock);
1546
1547 /* For secondary channels, we pick up ref-count on the primary server */
1548 if (CIFS_SERVER_IS_CHAN(server))
1549 cifs_put_tcp_session(server->primary_server, from_reconnect);
1550
1551 cancel_delayed_work_sync(&server->echo);
1552 cancel_delayed_work_sync(&server->resolve);
1553
1554 if (from_reconnect)
1555 /*
1556 * Avoid deadlock here: reconnect work calls
1557 * cifs_put_tcp_session() at its end. Need to be sure
1558 * that reconnect work does nothing with server pointer after
1559 * that step.
1560 */
1561 cancel_delayed_work(&server->reconnect);
1562 else
1563 cancel_delayed_work_sync(&server->reconnect);
1564
1565 spin_lock(&server->srv_lock);
1566 server->tcpStatus = CifsExiting;
1567 spin_unlock(&server->srv_lock);
1568
1569 cifs_crypto_secmech_release(server);
1570
1571 kfree_sensitive(server->session_key.response);
1572 server->session_key.response = NULL;
1573 server->session_key.len = 0;
1574 kfree(server->hostname);
1575 server->hostname = NULL;
1576
1577 task = xchg(&server->tsk, NULL);
1578 if (task)
1579 send_sig(SIGKILL, task, 1);
1580}
1581
1582struct TCP_Server_Info *
1583cifs_get_tcp_session(struct smb3_fs_context *ctx,
1584 struct TCP_Server_Info *primary_server)
1585{
1586 struct TCP_Server_Info *tcp_ses = NULL;
1587 int rc;
1588
1589 cifs_dbg(FYI, "UNC: %s\n", ctx->UNC);
1590
1591 /* see if we already have a matching tcp_ses */
1592 tcp_ses = cifs_find_tcp_session(ctx);
1593 if (tcp_ses)
1594 return tcp_ses;
1595
1596 tcp_ses = kzalloc(sizeof(struct TCP_Server_Info), GFP_KERNEL);
1597 if (!tcp_ses) {
1598 rc = -ENOMEM;
1599 goto out_err;
1600 }
1601
1602 tcp_ses->hostname = kstrdup(ctx->server_hostname, GFP_KERNEL);
1603 if (!tcp_ses->hostname) {
1604 rc = -ENOMEM;
1605 goto out_err;
1606 }
1607
1608 if (ctx->leaf_fullpath) {
1609 tcp_ses->leaf_fullpath = kstrdup(ctx->leaf_fullpath, GFP_KERNEL);
1610 if (!tcp_ses->leaf_fullpath) {
1611 rc = -ENOMEM;
1612 goto out_err;
1613 }
1614 tcp_ses->current_fullpath = tcp_ses->leaf_fullpath;
1615 }
1616
1617 if (ctx->nosharesock)
1618 tcp_ses->nosharesock = true;
1619
1620 tcp_ses->ops = ctx->ops;
1621 tcp_ses->vals = ctx->vals;
1622 cifs_set_net_ns(tcp_ses, get_net(current->nsproxy->net_ns));
1623
1624 tcp_ses->conn_id = atomic_inc_return(&tcpSesNextId);
1625 tcp_ses->noblockcnt = ctx->rootfs;
1626 tcp_ses->noblocksnd = ctx->noblocksnd || ctx->rootfs;
1627 tcp_ses->noautotune = ctx->noautotune;
1628 tcp_ses->tcp_nodelay = ctx->sockopt_tcp_nodelay;
1629 tcp_ses->rdma = ctx->rdma;
1630 tcp_ses->in_flight = 0;
1631 tcp_ses->max_in_flight = 0;
1632 tcp_ses->credits = 1;
1633 if (primary_server) {
1634 spin_lock(&cifs_tcp_ses_lock);
1635 ++primary_server->srv_count;
1636 spin_unlock(&cifs_tcp_ses_lock);
1637 tcp_ses->primary_server = primary_server;
1638 }
1639 init_waitqueue_head(&tcp_ses->response_q);
1640 init_waitqueue_head(&tcp_ses->request_q);
1641 INIT_LIST_HEAD(&tcp_ses->pending_mid_q);
1642 mutex_init(&tcp_ses->_srv_mutex);
1643 memcpy(tcp_ses->workstation_RFC1001_name,
1644 ctx->source_rfc1001_name, RFC1001_NAME_LEN_WITH_NULL);
1645 memcpy(tcp_ses->server_RFC1001_name,
1646 ctx->target_rfc1001_name, RFC1001_NAME_LEN_WITH_NULL);
1647 tcp_ses->session_estab = false;
1648 tcp_ses->sequence_number = 0;
1649 tcp_ses->reconnect_instance = 1;
1650 tcp_ses->lstrp = jiffies;
1651 tcp_ses->compress_algorithm = cpu_to_le16(ctx->compression);
1652 spin_lock_init(&tcp_ses->req_lock);
1653 spin_lock_init(&tcp_ses->srv_lock);
1654 spin_lock_init(&tcp_ses->mid_lock);
1655 INIT_LIST_HEAD(&tcp_ses->tcp_ses_list);
1656 INIT_LIST_HEAD(&tcp_ses->smb_ses_list);
1657 INIT_DELAYED_WORK(&tcp_ses->echo, cifs_echo_request);
1658 INIT_DELAYED_WORK(&tcp_ses->resolve, cifs_resolve_server);
1659 INIT_DELAYED_WORK(&tcp_ses->reconnect, smb2_reconnect_server);
1660 mutex_init(&tcp_ses->reconnect_mutex);
1661#ifdef CONFIG_CIFS_DFS_UPCALL
1662 mutex_init(&tcp_ses->refpath_lock);
1663#endif
1664 memcpy(&tcp_ses->srcaddr, &ctx->srcaddr,
1665 sizeof(tcp_ses->srcaddr));
1666 memcpy(&tcp_ses->dstaddr, &ctx->dstaddr,
1667 sizeof(tcp_ses->dstaddr));
1668 if (ctx->use_client_guid)
1669 memcpy(tcp_ses->client_guid, ctx->client_guid,
1670 SMB2_CLIENT_GUID_SIZE);
1671 else
1672 generate_random_uuid(tcp_ses->client_guid);
1673 /*
1674 * at this point we are the only ones with the pointer
1675 * to the struct since the kernel thread not created yet
1676 * no need to spinlock this init of tcpStatus or srv_count
1677 */
1678 tcp_ses->tcpStatus = CifsNew;
1679 ++tcp_ses->srv_count;
1680
1681 if (ctx->echo_interval >= SMB_ECHO_INTERVAL_MIN &&
1682 ctx->echo_interval <= SMB_ECHO_INTERVAL_MAX)
1683 tcp_ses->echo_interval = ctx->echo_interval * HZ;
1684 else
1685 tcp_ses->echo_interval = SMB_ECHO_INTERVAL_DEFAULT * HZ;
1686 if (tcp_ses->rdma) {
1687#ifndef CONFIG_CIFS_SMB_DIRECT
1688 cifs_dbg(VFS, "CONFIG_CIFS_SMB_DIRECT is not enabled\n");
1689 rc = -ENOENT;
1690 goto out_err_crypto_release;
1691#endif
1692 tcp_ses->smbd_conn = smbd_get_connection(
1693 tcp_ses, (struct sockaddr *)&ctx->dstaddr);
1694 if (tcp_ses->smbd_conn) {
1695 cifs_dbg(VFS, "RDMA transport established\n");
1696 rc = 0;
1697 goto smbd_connected;
1698 } else {
1699 rc = -ENOENT;
1700 goto out_err_crypto_release;
1701 }
1702 }
1703 rc = ip_connect(tcp_ses);
1704 if (rc < 0) {
1705 cifs_dbg(VFS, "Error connecting to socket. Aborting operation.\n");
1706 goto out_err_crypto_release;
1707 }
1708smbd_connected:
1709 /*
1710 * since we're in a cifs function already, we know that
1711 * this will succeed. No need for try_module_get().
1712 */
1713 __module_get(THIS_MODULE);
1714 tcp_ses->tsk = kthread_run(cifs_demultiplex_thread,
1715 tcp_ses, "cifsd");
1716 if (IS_ERR(tcp_ses->tsk)) {
1717 rc = PTR_ERR(tcp_ses->tsk);
1718 cifs_dbg(VFS, "error %d create cifsd thread\n", rc);
1719 module_put(THIS_MODULE);
1720 goto out_err_crypto_release;
1721 }
1722 tcp_ses->min_offload = ctx->min_offload;
1723 /*
1724 * at this point we are the only ones with the pointer
1725 * to the struct since the kernel thread not created yet
1726 * no need to spinlock this update of tcpStatus
1727 */
1728 spin_lock(&tcp_ses->srv_lock);
1729 tcp_ses->tcpStatus = CifsNeedNegotiate;
1730 spin_unlock(&tcp_ses->srv_lock);
1731
1732 if ((ctx->max_credits < 20) || (ctx->max_credits > 60000))
1733 tcp_ses->max_credits = SMB2_MAX_CREDITS_AVAILABLE;
1734 else
1735 tcp_ses->max_credits = ctx->max_credits;
1736
1737 tcp_ses->nr_targets = 1;
1738 tcp_ses->ignore_signature = ctx->ignore_signature;
1739 /* thread spawned, put it on the list */
1740 spin_lock(&cifs_tcp_ses_lock);
1741 list_add(&tcp_ses->tcp_ses_list, &cifs_tcp_ses_list);
1742 spin_unlock(&cifs_tcp_ses_lock);
1743
1744 /* queue echo request delayed work */
1745 queue_delayed_work(cifsiod_wq, &tcp_ses->echo, tcp_ses->echo_interval);
1746
1747 /* queue dns resolution delayed work */
1748 cifs_dbg(FYI, "%s: next dns resolution scheduled for %d seconds in the future\n",
1749 __func__, SMB_DNS_RESOLVE_INTERVAL_DEFAULT);
1750
1751 queue_delayed_work(cifsiod_wq, &tcp_ses->resolve, (SMB_DNS_RESOLVE_INTERVAL_DEFAULT * HZ));
1752
1753 return tcp_ses;
1754
1755out_err_crypto_release:
1756 cifs_crypto_secmech_release(tcp_ses);
1757
1758 put_net(cifs_net_ns(tcp_ses));
1759
1760out_err:
1761 if (tcp_ses) {
1762 if (CIFS_SERVER_IS_CHAN(tcp_ses))
1763 cifs_put_tcp_session(tcp_ses->primary_server, false);
1764 kfree(tcp_ses->hostname);
1765 kfree(tcp_ses->leaf_fullpath);
1766 if (tcp_ses->ssocket)
1767 sock_release(tcp_ses->ssocket);
1768 kfree(tcp_ses);
1769 }
1770 return ERR_PTR(rc);
1771}
1772
1773/* this function must be called with ses_lock held */
1774static int match_session(struct cifs_ses *ses, struct smb3_fs_context *ctx)
1775{
1776 if (ctx->sectype != Unspecified &&
1777 ctx->sectype != ses->sectype)
1778 return 0;
1779
1780 /*
1781 * If an existing session is limited to less channels than
1782 * requested, it should not be reused
1783 */
1784 spin_lock(&ses->chan_lock);
1785 if (ses->chan_max < ctx->max_channels) {
1786 spin_unlock(&ses->chan_lock);
1787 return 0;
1788 }
1789 spin_unlock(&ses->chan_lock);
1790
1791 switch (ses->sectype) {
1792 case Kerberos:
1793 if (!uid_eq(ctx->cred_uid, ses->cred_uid))
1794 return 0;
1795 break;
1796 default:
1797 /* NULL username means anonymous session */
1798 if (ses->user_name == NULL) {
1799 if (!ctx->nullauth)
1800 return 0;
1801 break;
1802 }
1803
1804 /* anything else takes username/password */
1805 if (strncmp(ses->user_name,
1806 ctx->username ? ctx->username : "",
1807 CIFS_MAX_USERNAME_LEN))
1808 return 0;
1809 if ((ctx->username && strlen(ctx->username) != 0) &&
1810 ses->password != NULL &&
1811 strncmp(ses->password,
1812 ctx->password ? ctx->password : "",
1813 CIFS_MAX_PASSWORD_LEN))
1814 return 0;
1815 }
1816 return 1;
1817}
1818
1819/**
1820 * cifs_setup_ipc - helper to setup the IPC tcon for the session
1821 * @ses: smb session to issue the request on
1822 * @ctx: the superblock configuration context to use for building the
1823 * new tree connection for the IPC (interprocess communication RPC)
1824 *
1825 * A new IPC connection is made and stored in the session
1826 * tcon_ipc. The IPC tcon has the same lifetime as the session.
1827 */
1828static int
1829cifs_setup_ipc(struct cifs_ses *ses, struct smb3_fs_context *ctx)
1830{
1831 int rc = 0, xid;
1832 struct cifs_tcon *tcon;
1833 char unc[SERVER_NAME_LENGTH + sizeof("//x/IPC$")] = {0};
1834 bool seal = false;
1835 struct TCP_Server_Info *server = ses->server;
1836
1837 /*
1838 * If the mount request that resulted in the creation of the
1839 * session requires encryption, force IPC to be encrypted too.
1840 */
1841 if (ctx->seal) {
1842 if (server->capabilities & SMB2_GLOBAL_CAP_ENCRYPTION)
1843 seal = true;
1844 else {
1845 cifs_server_dbg(VFS,
1846 "IPC: server doesn't support encryption\n");
1847 return -EOPNOTSUPP;
1848 }
1849 }
1850
1851 tcon = tconInfoAlloc();
1852 if (tcon == NULL)
1853 return -ENOMEM;
1854
1855 scnprintf(unc, sizeof(unc), "\\\\%s\\IPC$", server->hostname);
1856
1857 xid = get_xid();
1858 tcon->ses = ses;
1859 tcon->ipc = true;
1860 tcon->seal = seal;
1861 rc = server->ops->tree_connect(xid, ses, unc, tcon, ctx->local_nls);
1862 free_xid(xid);
1863
1864 if (rc) {
1865 cifs_server_dbg(VFS, "failed to connect to IPC (rc=%d)\n", rc);
1866 tconInfoFree(tcon);
1867 goto out;
1868 }
1869
1870 cifs_dbg(FYI, "IPC tcon rc=%d ipc tid=0x%x\n", rc, tcon->tid);
1871
1872 spin_lock(&tcon->tc_lock);
1873 tcon->status = TID_GOOD;
1874 spin_unlock(&tcon->tc_lock);
1875 ses->tcon_ipc = tcon;
1876out:
1877 return rc;
1878}
1879
1880/**
1881 * cifs_free_ipc - helper to release the session IPC tcon
1882 * @ses: smb session to unmount the IPC from
1883 *
1884 * Needs to be called everytime a session is destroyed.
1885 *
1886 * On session close, the IPC is closed and the server must release all tcons of the session.
1887 * No need to send a tree disconnect here.
1888 *
1889 * Besides, it will make the server to not close durable and resilient files on session close, as
1890 * specified in MS-SMB2 3.3.5.6 Receiving an SMB2 LOGOFF Request.
1891 */
1892static int
1893cifs_free_ipc(struct cifs_ses *ses)
1894{
1895 struct cifs_tcon *tcon = ses->tcon_ipc;
1896
1897 if (tcon == NULL)
1898 return 0;
1899
1900 tconInfoFree(tcon);
1901 ses->tcon_ipc = NULL;
1902 return 0;
1903}
1904
1905static struct cifs_ses *
1906cifs_find_smb_ses(struct TCP_Server_Info *server, struct smb3_fs_context *ctx)
1907{
1908 struct cifs_ses *ses;
1909
1910 spin_lock(&cifs_tcp_ses_lock);
1911 list_for_each_entry(ses, &server->smb_ses_list, smb_ses_list) {
1912 spin_lock(&ses->ses_lock);
1913 if (ses->ses_status == SES_EXITING) {
1914 spin_unlock(&ses->ses_lock);
1915 continue;
1916 }
1917 if (!match_session(ses, ctx)) {
1918 spin_unlock(&ses->ses_lock);
1919 continue;
1920 }
1921 spin_unlock(&ses->ses_lock);
1922
1923 ++ses->ses_count;
1924 spin_unlock(&cifs_tcp_ses_lock);
1925 return ses;
1926 }
1927 spin_unlock(&cifs_tcp_ses_lock);
1928 return NULL;
1929}
1930
1931void cifs_put_smb_ses(struct cifs_ses *ses)
1932{
1933 unsigned int rc, xid;
1934 unsigned int chan_count;
1935 struct TCP_Server_Info *server = ses->server;
1936
1937 spin_lock(&ses->ses_lock);
1938 if (ses->ses_status == SES_EXITING) {
1939 spin_unlock(&ses->ses_lock);
1940 return;
1941 }
1942 spin_unlock(&ses->ses_lock);
1943
1944 cifs_dbg(FYI, "%s: ses_count=%d\n", __func__, ses->ses_count);
1945 cifs_dbg(FYI,
1946 "%s: ses ipc: %s\n", __func__, ses->tcon_ipc ? ses->tcon_ipc->tree_name : "NONE");
1947
1948 spin_lock(&cifs_tcp_ses_lock);
1949 if (--ses->ses_count > 0) {
1950 spin_unlock(&cifs_tcp_ses_lock);
1951 return;
1952 }
1953 spin_unlock(&cifs_tcp_ses_lock);
1954
1955 /* ses_count can never go negative */
1956 WARN_ON(ses->ses_count < 0);
1957
1958 if (ses->ses_status == SES_GOOD)
1959 ses->ses_status = SES_EXITING;
1960
1961 cifs_free_ipc(ses);
1962
1963 if (ses->ses_status == SES_EXITING && server->ops->logoff) {
1964 xid = get_xid();
1965 rc = server->ops->logoff(xid, ses);
1966 if (rc)
1967 cifs_server_dbg(VFS, "%s: Session Logoff failure rc=%d\n",
1968 __func__, rc);
1969 _free_xid(xid);
1970 }
1971
1972 spin_lock(&cifs_tcp_ses_lock);
1973 list_del_init(&ses->smb_ses_list);
1974 spin_unlock(&cifs_tcp_ses_lock);
1975
1976 chan_count = ses->chan_count;
1977
1978 /* close any extra channels */
1979 if (chan_count > 1) {
1980 int i;
1981
1982 for (i = 1; i < chan_count; i++) {
1983 if (ses->chans[i].iface) {
1984 kref_put(&ses->chans[i].iface->refcount, release_iface);
1985 ses->chans[i].iface = NULL;
1986 }
1987 cifs_put_tcp_session(ses->chans[i].server, 0);
1988 ses->chans[i].server = NULL;
1989 }
1990 }
1991
1992 sesInfoFree(ses);
1993 cifs_put_tcp_session(server, 0);
1994}
1995
1996#ifdef CONFIG_KEYS
1997
1998/* strlen("cifs:a:") + CIFS_MAX_DOMAINNAME_LEN + 1 */
1999#define CIFSCREDS_DESC_SIZE (7 + CIFS_MAX_DOMAINNAME_LEN + 1)
2000
2001/* Populate username and pw fields from keyring if possible */
2002static int
2003cifs_set_cifscreds(struct smb3_fs_context *ctx, struct cifs_ses *ses)
2004{
2005 int rc = 0;
2006 int is_domain = 0;
2007 const char *delim, *payload;
2008 char *desc;
2009 ssize_t len;
2010 struct key *key;
2011 struct TCP_Server_Info *server = ses->server;
2012 struct sockaddr_in *sa;
2013 struct sockaddr_in6 *sa6;
2014 const struct user_key_payload *upayload;
2015
2016 desc = kmalloc(CIFSCREDS_DESC_SIZE, GFP_KERNEL);
2017 if (!desc)
2018 return -ENOMEM;
2019
2020 /* try to find an address key first */
2021 switch (server->dstaddr.ss_family) {
2022 case AF_INET:
2023 sa = (struct sockaddr_in *)&server->dstaddr;
2024 sprintf(desc, "cifs:a:%pI4", &sa->sin_addr.s_addr);
2025 break;
2026 case AF_INET6:
2027 sa6 = (struct sockaddr_in6 *)&server->dstaddr;
2028 sprintf(desc, "cifs:a:%pI6c", &sa6->sin6_addr.s6_addr);
2029 break;
2030 default:
2031 cifs_dbg(FYI, "Bad ss_family (%hu)\n",
2032 server->dstaddr.ss_family);
2033 rc = -EINVAL;
2034 goto out_err;
2035 }
2036
2037 cifs_dbg(FYI, "%s: desc=%s\n", __func__, desc);
2038 key = request_key(&key_type_logon, desc, "");
2039 if (IS_ERR(key)) {
2040 if (!ses->domainName) {
2041 cifs_dbg(FYI, "domainName is NULL\n");
2042 rc = PTR_ERR(key);
2043 goto out_err;
2044 }
2045
2046 /* didn't work, try to find a domain key */
2047 sprintf(desc, "cifs:d:%s", ses->domainName);
2048 cifs_dbg(FYI, "%s: desc=%s\n", __func__, desc);
2049 key = request_key(&key_type_logon, desc, "");
2050 if (IS_ERR(key)) {
2051 rc = PTR_ERR(key);
2052 goto out_err;
2053 }
2054 is_domain = 1;
2055 }
2056
2057 down_read(&key->sem);
2058 upayload = user_key_payload_locked(key);
2059 if (IS_ERR_OR_NULL(upayload)) {
2060 rc = upayload ? PTR_ERR(upayload) : -EINVAL;
2061 goto out_key_put;
2062 }
2063
2064 /* find first : in payload */
2065 payload = upayload->data;
2066 delim = strnchr(payload, upayload->datalen, ':');
2067 cifs_dbg(FYI, "payload=%s\n", payload);
2068 if (!delim) {
2069 cifs_dbg(FYI, "Unable to find ':' in payload (datalen=%d)\n",
2070 upayload->datalen);
2071 rc = -EINVAL;
2072 goto out_key_put;
2073 }
2074
2075 len = delim - payload;
2076 if (len > CIFS_MAX_USERNAME_LEN || len <= 0) {
2077 cifs_dbg(FYI, "Bad value from username search (len=%zd)\n",
2078 len);
2079 rc = -EINVAL;
2080 goto out_key_put;
2081 }
2082
2083 ctx->username = kstrndup(payload, len, GFP_KERNEL);
2084 if (!ctx->username) {
2085 cifs_dbg(FYI, "Unable to allocate %zd bytes for username\n",
2086 len);
2087 rc = -ENOMEM;
2088 goto out_key_put;
2089 }
2090 cifs_dbg(FYI, "%s: username=%s\n", __func__, ctx->username);
2091
2092 len = key->datalen - (len + 1);
2093 if (len > CIFS_MAX_PASSWORD_LEN || len <= 0) {
2094 cifs_dbg(FYI, "Bad len for password search (len=%zd)\n", len);
2095 rc = -EINVAL;
2096 kfree(ctx->username);
2097 ctx->username = NULL;
2098 goto out_key_put;
2099 }
2100
2101 ++delim;
2102 ctx->password = kstrndup(delim, len, GFP_KERNEL);
2103 if (!ctx->password) {
2104 cifs_dbg(FYI, "Unable to allocate %zd bytes for password\n",
2105 len);
2106 rc = -ENOMEM;
2107 kfree(ctx->username);
2108 ctx->username = NULL;
2109 goto out_key_put;
2110 }
2111
2112 /*
2113 * If we have a domain key then we must set the domainName in the
2114 * for the request.
2115 */
2116 if (is_domain && ses->domainName) {
2117 ctx->domainname = kstrdup(ses->domainName, GFP_KERNEL);
2118 if (!ctx->domainname) {
2119 cifs_dbg(FYI, "Unable to allocate %zd bytes for domain\n",
2120 len);
2121 rc = -ENOMEM;
2122 kfree(ctx->username);
2123 ctx->username = NULL;
2124 kfree_sensitive(ctx->password);
2125 ctx->password = NULL;
2126 goto out_key_put;
2127 }
2128 }
2129
2130 strscpy(ctx->workstation_name, ses->workstation_name, sizeof(ctx->workstation_name));
2131
2132out_key_put:
2133 up_read(&key->sem);
2134 key_put(key);
2135out_err:
2136 kfree(desc);
2137 cifs_dbg(FYI, "%s: returning %d\n", __func__, rc);
2138 return rc;
2139}
2140#else /* ! CONFIG_KEYS */
2141static inline int
2142cifs_set_cifscreds(struct smb3_fs_context *ctx __attribute__((unused)),
2143 struct cifs_ses *ses __attribute__((unused)))
2144{
2145 return -ENOSYS;
2146}
2147#endif /* CONFIG_KEYS */
2148
2149/**
2150 * cifs_get_smb_ses - get a session matching @ctx data from @server
2151 * @server: server to setup the session to
2152 * @ctx: superblock configuration context to use to setup the session
2153 *
2154 * This function assumes it is being called from cifs_mount() where we
2155 * already got a server reference (server refcount +1). See
2156 * cifs_get_tcon() for refcount explanations.
2157 */
2158struct cifs_ses *
2159cifs_get_smb_ses(struct TCP_Server_Info *server, struct smb3_fs_context *ctx)
2160{
2161 int rc = 0;
2162 unsigned int xid;
2163 struct cifs_ses *ses;
2164 struct sockaddr_in *addr = (struct sockaddr_in *)&server->dstaddr;
2165 struct sockaddr_in6 *addr6 = (struct sockaddr_in6 *)&server->dstaddr;
2166
2167 xid = get_xid();
2168
2169 ses = cifs_find_smb_ses(server, ctx);
2170 if (ses) {
2171 cifs_dbg(FYI, "Existing smb sess found (status=%d)\n",
2172 ses->ses_status);
2173
2174 spin_lock(&ses->chan_lock);
2175 if (cifs_chan_needs_reconnect(ses, server)) {
2176 spin_unlock(&ses->chan_lock);
2177 cifs_dbg(FYI, "Session needs reconnect\n");
2178
2179 mutex_lock(&ses->session_mutex);
2180 rc = cifs_negotiate_protocol(xid, ses, server);
2181 if (rc) {
2182 mutex_unlock(&ses->session_mutex);
2183 /* problem -- put our ses reference */
2184 cifs_put_smb_ses(ses);
2185 free_xid(xid);
2186 return ERR_PTR(rc);
2187 }
2188
2189 rc = cifs_setup_session(xid, ses, server,
2190 ctx->local_nls);
2191 if (rc) {
2192 mutex_unlock(&ses->session_mutex);
2193 /* problem -- put our reference */
2194 cifs_put_smb_ses(ses);
2195 free_xid(xid);
2196 return ERR_PTR(rc);
2197 }
2198 mutex_unlock(&ses->session_mutex);
2199
2200 spin_lock(&ses->chan_lock);
2201 }
2202 spin_unlock(&ses->chan_lock);
2203
2204 /* existing SMB ses has a server reference already */
2205 cifs_put_tcp_session(server, 0);
2206 free_xid(xid);
2207 return ses;
2208 }
2209
2210 rc = -ENOMEM;
2211
2212 cifs_dbg(FYI, "Existing smb sess not found\n");
2213 ses = sesInfoAlloc();
2214 if (ses == NULL)
2215 goto get_ses_fail;
2216
2217 /* new SMB session uses our server ref */
2218 ses->server = server;
2219 if (server->dstaddr.ss_family == AF_INET6)
2220 sprintf(ses->ip_addr, "%pI6", &addr6->sin6_addr);
2221 else
2222 sprintf(ses->ip_addr, "%pI4", &addr->sin_addr);
2223
2224 if (ctx->username) {
2225 ses->user_name = kstrdup(ctx->username, GFP_KERNEL);
2226 if (!ses->user_name)
2227 goto get_ses_fail;
2228 }
2229
2230 /* ctx->password freed at unmount */
2231 if (ctx->password) {
2232 ses->password = kstrdup(ctx->password, GFP_KERNEL);
2233 if (!ses->password)
2234 goto get_ses_fail;
2235 }
2236 if (ctx->domainname) {
2237 ses->domainName = kstrdup(ctx->domainname, GFP_KERNEL);
2238 if (!ses->domainName)
2239 goto get_ses_fail;
2240 }
2241
2242 strscpy(ses->workstation_name, ctx->workstation_name, sizeof(ses->workstation_name));
2243
2244 if (ctx->domainauto)
2245 ses->domainAuto = ctx->domainauto;
2246 ses->cred_uid = ctx->cred_uid;
2247 ses->linux_uid = ctx->linux_uid;
2248
2249 ses->sectype = ctx->sectype;
2250 ses->sign = ctx->sign;
2251
2252 /* add server as first channel */
2253 spin_lock(&ses->chan_lock);
2254 ses->chans[0].server = server;
2255 ses->chan_count = 1;
2256 ses->chan_max = ctx->multichannel ? ctx->max_channels:1;
2257 ses->chans_need_reconnect = 1;
2258 spin_unlock(&ses->chan_lock);
2259
2260 mutex_lock(&ses->session_mutex);
2261 rc = cifs_negotiate_protocol(xid, ses, server);
2262 if (!rc)
2263 rc = cifs_setup_session(xid, ses, server, ctx->local_nls);
2264 mutex_unlock(&ses->session_mutex);
2265
2266 /* each channel uses a different signing key */
2267 spin_lock(&ses->chan_lock);
2268 memcpy(ses->chans[0].signkey, ses->smb3signingkey,
2269 sizeof(ses->smb3signingkey));
2270 spin_unlock(&ses->chan_lock);
2271
2272 if (rc)
2273 goto get_ses_fail;
2274
2275 /*
2276 * success, put it on the list and add it as first channel
2277 * note: the session becomes active soon after this. So you'll
2278 * need to lock before changing something in the session.
2279 */
2280 spin_lock(&cifs_tcp_ses_lock);
2281 list_add(&ses->smb_ses_list, &server->smb_ses_list);
2282 spin_unlock(&cifs_tcp_ses_lock);
2283
2284 cifs_setup_ipc(ses, ctx);
2285
2286 free_xid(xid);
2287
2288 return ses;
2289
2290get_ses_fail:
2291 sesInfoFree(ses);
2292 free_xid(xid);
2293 return ERR_PTR(rc);
2294}
2295
2296/* this function must be called with tc_lock held */
2297static int match_tcon(struct cifs_tcon *tcon, struct smb3_fs_context *ctx, bool dfs_super_cmp)
2298{
2299 if (tcon->status == TID_EXITING)
2300 return 0;
2301 /* Skip UNC validation when matching DFS superblocks */
2302 if (!dfs_super_cmp && strncmp(tcon->tree_name, ctx->UNC, MAX_TREE_SIZE))
2303 return 0;
2304 if (tcon->seal != ctx->seal)
2305 return 0;
2306 if (tcon->snapshot_time != ctx->snapshot_time)
2307 return 0;
2308 if (tcon->handle_timeout != ctx->handle_timeout)
2309 return 0;
2310 if (tcon->no_lease != ctx->no_lease)
2311 return 0;
2312 if (tcon->nodelete != ctx->nodelete)
2313 return 0;
2314 return 1;
2315}
2316
2317static struct cifs_tcon *
2318cifs_find_tcon(struct cifs_ses *ses, struct smb3_fs_context *ctx)
2319{
2320 struct cifs_tcon *tcon;
2321
2322 spin_lock(&cifs_tcp_ses_lock);
2323 list_for_each_entry(tcon, &ses->tcon_list, tcon_list) {
2324 spin_lock(&tcon->tc_lock);
2325 if (!match_tcon(tcon, ctx, false)) {
2326 spin_unlock(&tcon->tc_lock);
2327 continue;
2328 }
2329 ++tcon->tc_count;
2330 spin_unlock(&tcon->tc_lock);
2331 spin_unlock(&cifs_tcp_ses_lock);
2332 return tcon;
2333 }
2334 spin_unlock(&cifs_tcp_ses_lock);
2335 return NULL;
2336}
2337
2338void
2339cifs_put_tcon(struct cifs_tcon *tcon)
2340{
2341 unsigned int xid;
2342 struct cifs_ses *ses;
2343
2344 /*
2345 * IPC tcon share the lifetime of their session and are
2346 * destroyed in the session put function
2347 */
2348 if (tcon == NULL || tcon->ipc)
2349 return;
2350
2351 ses = tcon->ses;
2352 cifs_dbg(FYI, "%s: tc_count=%d\n", __func__, tcon->tc_count);
2353 spin_lock(&cifs_tcp_ses_lock);
2354 spin_lock(&tcon->tc_lock);
2355 if (--tcon->tc_count > 0) {
2356 spin_unlock(&tcon->tc_lock);
2357 spin_unlock(&cifs_tcp_ses_lock);
2358 return;
2359 }
2360
2361 /* tc_count can never go negative */
2362 WARN_ON(tcon->tc_count < 0);
2363
2364 list_del_init(&tcon->tcon_list);
2365 spin_unlock(&tcon->tc_lock);
2366 spin_unlock(&cifs_tcp_ses_lock);
2367
2368 /* cancel polling of interfaces */
2369 cancel_delayed_work_sync(&tcon->query_interfaces);
2370
2371 if (tcon->use_witness) {
2372 int rc;
2373
2374 rc = cifs_swn_unregister(tcon);
2375 if (rc < 0) {
2376 cifs_dbg(VFS, "%s: Failed to unregister for witness notifications: %d\n",
2377 __func__, rc);
2378 }
2379 }
2380
2381 xid = get_xid();
2382 if (ses->server->ops->tree_disconnect)
2383 ses->server->ops->tree_disconnect(xid, tcon);
2384 _free_xid(xid);
2385
2386 cifs_fscache_release_super_cookie(tcon);
2387 tconInfoFree(tcon);
2388 cifs_put_smb_ses(ses);
2389}
2390
2391/**
2392 * cifs_get_tcon - get a tcon matching @ctx data from @ses
2393 * @ses: smb session to issue the request on
2394 * @ctx: the superblock configuration context to use for building the
2395 *
2396 * - tcon refcount is the number of mount points using the tcon.
2397 * - ses refcount is the number of tcon using the session.
2398 *
2399 * 1. This function assumes it is being called from cifs_mount() where
2400 * we already got a session reference (ses refcount +1).
2401 *
2402 * 2. Since we're in the context of adding a mount point, the end
2403 * result should be either:
2404 *
2405 * a) a new tcon already allocated with refcount=1 (1 mount point) and
2406 * its session refcount incremented (1 new tcon). This +1 was
2407 * already done in (1).
2408 *
2409 * b) an existing tcon with refcount+1 (add a mount point to it) and
2410 * identical ses refcount (no new tcon). Because of (1) we need to
2411 * decrement the ses refcount.
2412 */
2413static struct cifs_tcon *
2414cifs_get_tcon(struct cifs_ses *ses, struct smb3_fs_context *ctx)
2415{
2416 int rc, xid;
2417 struct cifs_tcon *tcon;
2418
2419 tcon = cifs_find_tcon(ses, ctx);
2420 if (tcon) {
2421 /*
2422 * tcon has refcount already incremented but we need to
2423 * decrement extra ses reference gotten by caller (case b)
2424 */
2425 cifs_dbg(FYI, "Found match on UNC path\n");
2426 cifs_put_smb_ses(ses);
2427 return tcon;
2428 }
2429
2430 if (!ses->server->ops->tree_connect) {
2431 rc = -ENOSYS;
2432 goto out_fail;
2433 }
2434
2435 tcon = tconInfoAlloc();
2436 if (tcon == NULL) {
2437 rc = -ENOMEM;
2438 goto out_fail;
2439 }
2440
2441 if (ctx->snapshot_time) {
2442 if (ses->server->vals->protocol_id == 0) {
2443 cifs_dbg(VFS,
2444 "Use SMB2 or later for snapshot mount option\n");
2445 rc = -EOPNOTSUPP;
2446 goto out_fail;
2447 } else
2448 tcon->snapshot_time = ctx->snapshot_time;
2449 }
2450
2451 if (ctx->handle_timeout) {
2452 if (ses->server->vals->protocol_id == 0) {
2453 cifs_dbg(VFS,
2454 "Use SMB2.1 or later for handle timeout option\n");
2455 rc = -EOPNOTSUPP;
2456 goto out_fail;
2457 } else
2458 tcon->handle_timeout = ctx->handle_timeout;
2459 }
2460
2461 tcon->ses = ses;
2462 if (ctx->password) {
2463 tcon->password = kstrdup(ctx->password, GFP_KERNEL);
2464 if (!tcon->password) {
2465 rc = -ENOMEM;
2466 goto out_fail;
2467 }
2468 }
2469
2470 if (ctx->seal) {
2471 if (ses->server->vals->protocol_id == 0) {
2472 cifs_dbg(VFS,
2473 "SMB3 or later required for encryption\n");
2474 rc = -EOPNOTSUPP;
2475 goto out_fail;
2476 } else if (tcon->ses->server->capabilities &
2477 SMB2_GLOBAL_CAP_ENCRYPTION)
2478 tcon->seal = true;
2479 else {
2480 cifs_dbg(VFS, "Encryption is not supported on share\n");
2481 rc = -EOPNOTSUPP;
2482 goto out_fail;
2483 }
2484 }
2485
2486 if (ctx->linux_ext) {
2487 if (ses->server->posix_ext_supported) {
2488 tcon->posix_extensions = true;
2489 pr_warn_once("SMB3.11 POSIX Extensions are experimental\n");
2490 } else if ((ses->server->vals->protocol_id == SMB311_PROT_ID) ||
2491 (strcmp(ses->server->vals->version_string,
2492 SMB3ANY_VERSION_STRING) == 0) ||
2493 (strcmp(ses->server->vals->version_string,
2494 SMBDEFAULT_VERSION_STRING) == 0)) {
2495 cifs_dbg(VFS, "Server does not support mounting with posix SMB3.11 extensions\n");
2496 rc = -EOPNOTSUPP;
2497 goto out_fail;
2498 } else {
2499 cifs_dbg(VFS, "Check vers= mount option. SMB3.11 "
2500 "disabled but required for POSIX extensions\n");
2501 rc = -EOPNOTSUPP;
2502 goto out_fail;
2503 }
2504 }
2505
2506 xid = get_xid();
2507 rc = ses->server->ops->tree_connect(xid, ses, ctx->UNC, tcon,
2508 ctx->local_nls);
2509 free_xid(xid);
2510 cifs_dbg(FYI, "Tcon rc = %d\n", rc);
2511 if (rc)
2512 goto out_fail;
2513
2514 tcon->use_persistent = false;
2515 /* check if SMB2 or later, CIFS does not support persistent handles */
2516 if (ctx->persistent) {
2517 if (ses->server->vals->protocol_id == 0) {
2518 cifs_dbg(VFS,
2519 "SMB3 or later required for persistent handles\n");
2520 rc = -EOPNOTSUPP;
2521 goto out_fail;
2522 } else if (ses->server->capabilities &
2523 SMB2_GLOBAL_CAP_PERSISTENT_HANDLES)
2524 tcon->use_persistent = true;
2525 else /* persistent handles requested but not supported */ {
2526 cifs_dbg(VFS,
2527 "Persistent handles not supported on share\n");
2528 rc = -EOPNOTSUPP;
2529 goto out_fail;
2530 }
2531 } else if ((tcon->capabilities & SMB2_SHARE_CAP_CONTINUOUS_AVAILABILITY)
2532 && (ses->server->capabilities & SMB2_GLOBAL_CAP_PERSISTENT_HANDLES)
2533 && (ctx->nopersistent == false)) {
2534 cifs_dbg(FYI, "enabling persistent handles\n");
2535 tcon->use_persistent = true;
2536 } else if (ctx->resilient) {
2537 if (ses->server->vals->protocol_id == 0) {
2538 cifs_dbg(VFS,
2539 "SMB2.1 or later required for resilient handles\n");
2540 rc = -EOPNOTSUPP;
2541 goto out_fail;
2542 }
2543 tcon->use_resilient = true;
2544 }
2545
2546 tcon->use_witness = false;
2547 if (IS_ENABLED(CONFIG_CIFS_SWN_UPCALL) && ctx->witness) {
2548 if (ses->server->vals->protocol_id >= SMB30_PROT_ID) {
2549 if (tcon->capabilities & SMB2_SHARE_CAP_CLUSTER) {
2550 /*
2551 * Set witness in use flag in first place
2552 * to retry registration in the echo task
2553 */
2554 tcon->use_witness = true;
2555 /* And try to register immediately */
2556 rc = cifs_swn_register(tcon);
2557 if (rc < 0) {
2558 cifs_dbg(VFS, "Failed to register for witness notifications: %d\n", rc);
2559 goto out_fail;
2560 }
2561 } else {
2562 /* TODO: try to extend for non-cluster uses (eg multichannel) */
2563 cifs_dbg(VFS, "witness requested on mount but no CLUSTER capability on share\n");
2564 rc = -EOPNOTSUPP;
2565 goto out_fail;
2566 }
2567 } else {
2568 cifs_dbg(VFS, "SMB3 or later required for witness option\n");
2569 rc = -EOPNOTSUPP;
2570 goto out_fail;
2571 }
2572 }
2573
2574 /* If the user really knows what they are doing they can override */
2575 if (tcon->share_flags & SMB2_SHAREFLAG_NO_CACHING) {
2576 if (ctx->cache_ro)
2577 cifs_dbg(VFS, "cache=ro requested on mount but NO_CACHING flag set on share\n");
2578 else if (ctx->cache_rw)
2579 cifs_dbg(VFS, "cache=singleclient requested on mount but NO_CACHING flag set on share\n");
2580 }
2581
2582 if (ctx->no_lease) {
2583 if (ses->server->vals->protocol_id == 0) {
2584 cifs_dbg(VFS,
2585 "SMB2 or later required for nolease option\n");
2586 rc = -EOPNOTSUPP;
2587 goto out_fail;
2588 } else
2589 tcon->no_lease = ctx->no_lease;
2590 }
2591
2592 /*
2593 * We can have only one retry value for a connection to a share so for
2594 * resources mounted more than once to the same server share the last
2595 * value passed in for the retry flag is used.
2596 */
2597 tcon->retry = ctx->retry;
2598 tcon->nocase = ctx->nocase;
2599 tcon->broken_sparse_sup = ctx->no_sparse;
2600 if (ses->server->capabilities & SMB2_GLOBAL_CAP_DIRECTORY_LEASING)
2601 tcon->nohandlecache = ctx->nohandlecache;
2602 else
2603 tcon->nohandlecache = true;
2604 tcon->nodelete = ctx->nodelete;
2605 tcon->local_lease = ctx->local_lease;
2606 INIT_LIST_HEAD(&tcon->pending_opens);
2607 tcon->status = TID_GOOD;
2608
2609 INIT_DELAYED_WORK(&tcon->query_interfaces,
2610 smb2_query_server_interfaces);
2611 if (ses->server->dialect >= SMB30_PROT_ID &&
2612 (ses->server->capabilities & SMB2_GLOBAL_CAP_MULTI_CHANNEL)) {
2613 /* schedule query interfaces poll */
2614 queue_delayed_work(cifsiod_wq, &tcon->query_interfaces,
2615 (SMB_INTERFACE_POLL_INTERVAL * HZ));
2616 }
2617
2618 spin_lock(&cifs_tcp_ses_lock);
2619 list_add(&tcon->tcon_list, &ses->tcon_list);
2620 spin_unlock(&cifs_tcp_ses_lock);
2621
2622 return tcon;
2623
2624out_fail:
2625 tconInfoFree(tcon);
2626 return ERR_PTR(rc);
2627}
2628
2629void
2630cifs_put_tlink(struct tcon_link *tlink)
2631{
2632 if (!tlink || IS_ERR(tlink))
2633 return;
2634
2635 if (!atomic_dec_and_test(&tlink->tl_count) ||
2636 test_bit(TCON_LINK_IN_TREE, &tlink->tl_flags)) {
2637 tlink->tl_time = jiffies;
2638 return;
2639 }
2640
2641 if (!IS_ERR(tlink_tcon(tlink)))
2642 cifs_put_tcon(tlink_tcon(tlink));
2643 kfree(tlink);
2644 return;
2645}
2646
2647static int
2648compare_mount_options(struct super_block *sb, struct cifs_mnt_data *mnt_data)
2649{
2650 struct cifs_sb_info *old = CIFS_SB(sb);
2651 struct cifs_sb_info *new = mnt_data->cifs_sb;
2652 unsigned int oldflags = old->mnt_cifs_flags & CIFS_MOUNT_MASK;
2653 unsigned int newflags = new->mnt_cifs_flags & CIFS_MOUNT_MASK;
2654
2655 if ((sb->s_flags & CIFS_MS_MASK) != (mnt_data->flags & CIFS_MS_MASK))
2656 return 0;
2657
2658 if (old->mnt_cifs_serverino_autodisabled)
2659 newflags &= ~CIFS_MOUNT_SERVER_INUM;
2660
2661 if (oldflags != newflags)
2662 return 0;
2663
2664 /*
2665 * We want to share sb only if we don't specify an r/wsize or
2666 * specified r/wsize is greater than or equal to existing one.
2667 */
2668 if (new->ctx->wsize && new->ctx->wsize < old->ctx->wsize)
2669 return 0;
2670
2671 if (new->ctx->rsize && new->ctx->rsize < old->ctx->rsize)
2672 return 0;
2673
2674 if (!uid_eq(old->ctx->linux_uid, new->ctx->linux_uid) ||
2675 !gid_eq(old->ctx->linux_gid, new->ctx->linux_gid))
2676 return 0;
2677
2678 if (old->ctx->file_mode != new->ctx->file_mode ||
2679 old->ctx->dir_mode != new->ctx->dir_mode)
2680 return 0;
2681
2682 if (strcmp(old->local_nls->charset, new->local_nls->charset))
2683 return 0;
2684
2685 if (old->ctx->acregmax != new->ctx->acregmax)
2686 return 0;
2687 if (old->ctx->acdirmax != new->ctx->acdirmax)
2688 return 0;
2689 if (old->ctx->closetimeo != new->ctx->closetimeo)
2690 return 0;
2691
2692 return 1;
2693}
2694
2695static int
2696match_prepath(struct super_block *sb, struct cifs_mnt_data *mnt_data)
2697{
2698 struct cifs_sb_info *old = CIFS_SB(sb);
2699 struct cifs_sb_info *new = mnt_data->cifs_sb;
2700 bool old_set = (old->mnt_cifs_flags & CIFS_MOUNT_USE_PREFIX_PATH) &&
2701 old->prepath;
2702 bool new_set = (new->mnt_cifs_flags & CIFS_MOUNT_USE_PREFIX_PATH) &&
2703 new->prepath;
2704
2705 if (old_set && new_set && !strcmp(new->prepath, old->prepath))
2706 return 1;
2707 else if (!old_set && !new_set)
2708 return 1;
2709
2710 return 0;
2711}
2712
2713int
2714cifs_match_super(struct super_block *sb, void *data)
2715{
2716 struct cifs_mnt_data *mnt_data = data;
2717 struct smb3_fs_context *ctx;
2718 struct cifs_sb_info *cifs_sb;
2719 struct TCP_Server_Info *tcp_srv;
2720 struct cifs_ses *ses;
2721 struct cifs_tcon *tcon;
2722 struct tcon_link *tlink;
2723 bool dfs_super_cmp;
2724 int rc = 0;
2725
2726 spin_lock(&cifs_tcp_ses_lock);
2727 cifs_sb = CIFS_SB(sb);
2728 tlink = cifs_get_tlink(cifs_sb_master_tlink(cifs_sb));
2729 if (tlink == NULL) {
2730 /* can not match superblock if tlink were ever null */
2731 spin_unlock(&cifs_tcp_ses_lock);
2732 return 0;
2733 }
2734 tcon = tlink_tcon(tlink);
2735 ses = tcon->ses;
2736 tcp_srv = ses->server;
2737
2738 dfs_super_cmp = IS_ENABLED(CONFIG_CIFS_DFS_UPCALL) && tcp_srv->origin_fullpath;
2739
2740 ctx = mnt_data->ctx;
2741
2742 spin_lock(&tcp_srv->srv_lock);
2743 spin_lock(&ses->ses_lock);
2744 spin_lock(&tcon->tc_lock);
2745 if (!match_server(tcp_srv, ctx, dfs_super_cmp) ||
2746 !match_session(ses, ctx) ||
2747 !match_tcon(tcon, ctx, dfs_super_cmp) ||
2748 !match_prepath(sb, mnt_data)) {
2749 rc = 0;
2750 goto out;
2751 }
2752
2753 rc = compare_mount_options(sb, mnt_data);
2754out:
2755 spin_unlock(&tcon->tc_lock);
2756 spin_unlock(&ses->ses_lock);
2757 spin_unlock(&tcp_srv->srv_lock);
2758
2759 spin_unlock(&cifs_tcp_ses_lock);
2760 cifs_put_tlink(tlink);
2761 return rc;
2762}
2763
2764#ifdef CONFIG_DEBUG_LOCK_ALLOC
2765static struct lock_class_key cifs_key[2];
2766static struct lock_class_key cifs_slock_key[2];
2767
2768static inline void
2769cifs_reclassify_socket4(struct socket *sock)
2770{
2771 struct sock *sk = sock->sk;
2772 BUG_ON(!sock_allow_reclassification(sk));
2773 sock_lock_init_class_and_name(sk, "slock-AF_INET-CIFS",
2774 &cifs_slock_key[0], "sk_lock-AF_INET-CIFS", &cifs_key[0]);
2775}
2776
2777static inline void
2778cifs_reclassify_socket6(struct socket *sock)
2779{
2780 struct sock *sk = sock->sk;
2781 BUG_ON(!sock_allow_reclassification(sk));
2782 sock_lock_init_class_and_name(sk, "slock-AF_INET6-CIFS",
2783 &cifs_slock_key[1], "sk_lock-AF_INET6-CIFS", &cifs_key[1]);
2784}
2785#else
2786static inline void
2787cifs_reclassify_socket4(struct socket *sock)
2788{
2789}
2790
2791static inline void
2792cifs_reclassify_socket6(struct socket *sock)
2793{
2794}
2795#endif
2796
2797/* See RFC1001 section 14 on representation of Netbios names */
2798static void rfc1002mangle(char *target, char *source, unsigned int length)
2799{
2800 unsigned int i, j;
2801
2802 for (i = 0, j = 0; i < (length); i++) {
2803 /* mask a nibble at a time and encode */
2804 target[j] = 'A' + (0x0F & (source[i] >> 4));
2805 target[j+1] = 'A' + (0x0F & source[i]);
2806 j += 2;
2807 }
2808
2809}
2810
2811static int
2812bind_socket(struct TCP_Server_Info *server)
2813{
2814 int rc = 0;
2815 if (server->srcaddr.ss_family != AF_UNSPEC) {
2816 /* Bind to the specified local IP address */
2817 struct socket *socket = server->ssocket;
2818 rc = socket->ops->bind(socket,
2819 (struct sockaddr *) &server->srcaddr,
2820 sizeof(server->srcaddr));
2821 if (rc < 0) {
2822 struct sockaddr_in *saddr4;
2823 struct sockaddr_in6 *saddr6;
2824 saddr4 = (struct sockaddr_in *)&server->srcaddr;
2825 saddr6 = (struct sockaddr_in6 *)&server->srcaddr;
2826 if (saddr6->sin6_family == AF_INET6)
2827 cifs_server_dbg(VFS, "Failed to bind to: %pI6c, error: %d\n",
2828 &saddr6->sin6_addr, rc);
2829 else
2830 cifs_server_dbg(VFS, "Failed to bind to: %pI4, error: %d\n",
2831 &saddr4->sin_addr.s_addr, rc);
2832 }
2833 }
2834 return rc;
2835}
2836
2837static int
2838ip_rfc1001_connect(struct TCP_Server_Info *server)
2839{
2840 int rc = 0;
2841 /*
2842 * some servers require RFC1001 sessinit before sending
2843 * negprot - BB check reconnection in case where second
2844 * sessinit is sent but no second negprot
2845 */
2846 struct rfc1002_session_packet *ses_init_buf;
2847 unsigned int req_noscope_len;
2848 struct smb_hdr *smb_buf;
2849
2850 ses_init_buf = kzalloc(sizeof(struct rfc1002_session_packet),
2851 GFP_KERNEL);
2852
2853 if (ses_init_buf) {
2854 ses_init_buf->trailer.session_req.called_len = 32;
2855
2856 if (server->server_RFC1001_name[0] != 0)
2857 rfc1002mangle(ses_init_buf->trailer.
2858 session_req.called_name,
2859 server->server_RFC1001_name,
2860 RFC1001_NAME_LEN_WITH_NULL);
2861 else
2862 rfc1002mangle(ses_init_buf->trailer.
2863 session_req.called_name,
2864 DEFAULT_CIFS_CALLED_NAME,
2865 RFC1001_NAME_LEN_WITH_NULL);
2866
2867 ses_init_buf->trailer.session_req.calling_len = 32;
2868
2869 /*
2870 * calling name ends in null (byte 16) from old smb
2871 * convention.
2872 */
2873 if (server->workstation_RFC1001_name[0] != 0)
2874 rfc1002mangle(ses_init_buf->trailer.
2875 session_req.calling_name,
2876 server->workstation_RFC1001_name,
2877 RFC1001_NAME_LEN_WITH_NULL);
2878 else
2879 rfc1002mangle(ses_init_buf->trailer.
2880 session_req.calling_name,
2881 "LINUX_CIFS_CLNT",
2882 RFC1001_NAME_LEN_WITH_NULL);
2883
2884 ses_init_buf->trailer.session_req.scope1 = 0;
2885 ses_init_buf->trailer.session_req.scope2 = 0;
2886 smb_buf = (struct smb_hdr *)ses_init_buf;
2887
2888 /* sizeof RFC1002_SESSION_REQUEST with no scopes */
2889 req_noscope_len = sizeof(struct rfc1002_session_packet) - 2;
2890
2891 /* == cpu_to_be32(0x81000044) */
2892 smb_buf->smb_buf_length =
2893 cpu_to_be32((RFC1002_SESSION_REQUEST << 24) | req_noscope_len);
2894 rc = smb_send(server, smb_buf, 0x44);
2895 kfree(ses_init_buf);
2896 /*
2897 * RFC1001 layer in at least one server
2898 * requires very short break before negprot
2899 * presumably because not expecting negprot
2900 * to follow so fast. This is a simple
2901 * solution that works without
2902 * complicating the code and causes no
2903 * significant slowing down on mount
2904 * for everyone else
2905 */
2906 usleep_range(1000, 2000);
2907 }
2908 /*
2909 * else the negprot may still work without this
2910 * even though malloc failed
2911 */
2912
2913 return rc;
2914}
2915
2916static int
2917generic_ip_connect(struct TCP_Server_Info *server)
2918{
2919 int rc = 0;
2920 __be16 sport;
2921 int slen, sfamily;
2922 struct socket *socket = server->ssocket;
2923 struct sockaddr *saddr;
2924
2925 saddr = (struct sockaddr *) &server->dstaddr;
2926
2927 if (server->dstaddr.ss_family == AF_INET6) {
2928 struct sockaddr_in6 *ipv6 = (struct sockaddr_in6 *)&server->dstaddr;
2929
2930 sport = ipv6->sin6_port;
2931 slen = sizeof(struct sockaddr_in6);
2932 sfamily = AF_INET6;
2933 cifs_dbg(FYI, "%s: connecting to [%pI6]:%d\n", __func__, &ipv6->sin6_addr,
2934 ntohs(sport));
2935 } else {
2936 struct sockaddr_in *ipv4 = (struct sockaddr_in *)&server->dstaddr;
2937
2938 sport = ipv4->sin_port;
2939 slen = sizeof(struct sockaddr_in);
2940 sfamily = AF_INET;
2941 cifs_dbg(FYI, "%s: connecting to %pI4:%d\n", __func__, &ipv4->sin_addr,
2942 ntohs(sport));
2943 }
2944
2945 if (socket == NULL) {
2946 rc = __sock_create(cifs_net_ns(server), sfamily, SOCK_STREAM,
2947 IPPROTO_TCP, &socket, 1);
2948 if (rc < 0) {
2949 cifs_server_dbg(VFS, "Error %d creating socket\n", rc);
2950 server->ssocket = NULL;
2951 return rc;
2952 }
2953
2954 /* BB other socket options to set KEEPALIVE, NODELAY? */
2955 cifs_dbg(FYI, "Socket created\n");
2956 server->ssocket = socket;
2957 socket->sk->sk_allocation = GFP_NOFS;
2958 socket->sk->sk_use_task_frag = false;
2959 if (sfamily == AF_INET6)
2960 cifs_reclassify_socket6(socket);
2961 else
2962 cifs_reclassify_socket4(socket);
2963 }
2964
2965 rc = bind_socket(server);
2966 if (rc < 0)
2967 return rc;
2968
2969 /*
2970 * Eventually check for other socket options to change from
2971 * the default. sock_setsockopt not used because it expects
2972 * user space buffer
2973 */
2974 socket->sk->sk_rcvtimeo = 7 * HZ;
2975 socket->sk->sk_sndtimeo = 5 * HZ;
2976
2977 /* make the bufsizes depend on wsize/rsize and max requests */
2978 if (server->noautotune) {
2979 if (socket->sk->sk_sndbuf < (200 * 1024))
2980 socket->sk->sk_sndbuf = 200 * 1024;
2981 if (socket->sk->sk_rcvbuf < (140 * 1024))
2982 socket->sk->sk_rcvbuf = 140 * 1024;
2983 }
2984
2985 if (server->tcp_nodelay)
2986 tcp_sock_set_nodelay(socket->sk);
2987
2988 cifs_dbg(FYI, "sndbuf %d rcvbuf %d rcvtimeo 0x%lx\n",
2989 socket->sk->sk_sndbuf,
2990 socket->sk->sk_rcvbuf, socket->sk->sk_rcvtimeo);
2991
2992 rc = socket->ops->connect(socket, saddr, slen,
2993 server->noblockcnt ? O_NONBLOCK : 0);
2994 /*
2995 * When mounting SMB root file systems, we do not want to block in
2996 * connect. Otherwise bail out and then let cifs_reconnect() perform
2997 * reconnect failover - if possible.
2998 */
2999 if (server->noblockcnt && rc == -EINPROGRESS)
3000 rc = 0;
3001 if (rc < 0) {
3002 cifs_dbg(FYI, "Error %d connecting to server\n", rc);
3003 trace_smb3_connect_err(server->hostname, server->conn_id, &server->dstaddr, rc);
3004 sock_release(socket);
3005 server->ssocket = NULL;
3006 return rc;
3007 }
3008 trace_smb3_connect_done(server->hostname, server->conn_id, &server->dstaddr);
3009 if (sport == htons(RFC1001_PORT))
3010 rc = ip_rfc1001_connect(server);
3011
3012 return rc;
3013}
3014
3015static int
3016ip_connect(struct TCP_Server_Info *server)
3017{
3018 __be16 *sport;
3019 struct sockaddr_in6 *addr6 = (struct sockaddr_in6 *)&server->dstaddr;
3020 struct sockaddr_in *addr = (struct sockaddr_in *)&server->dstaddr;
3021
3022 if (server->dstaddr.ss_family == AF_INET6)
3023 sport = &addr6->sin6_port;
3024 else
3025 sport = &addr->sin_port;
3026
3027 if (*sport == 0) {
3028 int rc;
3029
3030 /* try with 445 port at first */
3031 *sport = htons(CIFS_PORT);
3032
3033 rc = generic_ip_connect(server);
3034 if (rc >= 0)
3035 return rc;
3036
3037 /* if it failed, try with 139 port */
3038 *sport = htons(RFC1001_PORT);
3039 }
3040
3041 return generic_ip_connect(server);
3042}
3043
3044#ifdef CONFIG_CIFS_ALLOW_INSECURE_LEGACY
3045void reset_cifs_unix_caps(unsigned int xid, struct cifs_tcon *tcon,
3046 struct cifs_sb_info *cifs_sb, struct smb3_fs_context *ctx)
3047{
3048 /*
3049 * If we are reconnecting then should we check to see if
3050 * any requested capabilities changed locally e.g. via
3051 * remount but we can not do much about it here
3052 * if they have (even if we could detect it by the following)
3053 * Perhaps we could add a backpointer to array of sb from tcon
3054 * or if we change to make all sb to same share the same
3055 * sb as NFS - then we only have one backpointer to sb.
3056 * What if we wanted to mount the server share twice once with
3057 * and once without posixacls or posix paths?
3058 */
3059 __u64 saved_cap = le64_to_cpu(tcon->fsUnixInfo.Capability);
3060
3061 if (ctx && ctx->no_linux_ext) {
3062 tcon->fsUnixInfo.Capability = 0;
3063 tcon->unix_ext = 0; /* Unix Extensions disabled */
3064 cifs_dbg(FYI, "Linux protocol extensions disabled\n");
3065 return;
3066 } else if (ctx)
3067 tcon->unix_ext = 1; /* Unix Extensions supported */
3068
3069 if (!tcon->unix_ext) {
3070 cifs_dbg(FYI, "Unix extensions disabled so not set on reconnect\n");
3071 return;
3072 }
3073
3074 if (!CIFSSMBQFSUnixInfo(xid, tcon)) {
3075 __u64 cap = le64_to_cpu(tcon->fsUnixInfo.Capability);
3076 cifs_dbg(FYI, "unix caps which server supports %lld\n", cap);
3077 /*
3078 * check for reconnect case in which we do not
3079 * want to change the mount behavior if we can avoid it
3080 */
3081 if (ctx == NULL) {
3082 /*
3083 * turn off POSIX ACL and PATHNAMES if not set
3084 * originally at mount time
3085 */
3086 if ((saved_cap & CIFS_UNIX_POSIX_ACL_CAP) == 0)
3087 cap &= ~CIFS_UNIX_POSIX_ACL_CAP;
3088 if ((saved_cap & CIFS_UNIX_POSIX_PATHNAMES_CAP) == 0) {
3089 if (cap & CIFS_UNIX_POSIX_PATHNAMES_CAP)
3090 cifs_dbg(VFS, "POSIXPATH support change\n");
3091 cap &= ~CIFS_UNIX_POSIX_PATHNAMES_CAP;
3092 } else if ((cap & CIFS_UNIX_POSIX_PATHNAMES_CAP) == 0) {
3093 cifs_dbg(VFS, "possible reconnect error\n");
3094 cifs_dbg(VFS, "server disabled POSIX path support\n");
3095 }
3096 }
3097
3098 if (cap & CIFS_UNIX_TRANSPORT_ENCRYPTION_MANDATORY_CAP)
3099 cifs_dbg(VFS, "per-share encryption not supported yet\n");
3100
3101 cap &= CIFS_UNIX_CAP_MASK;
3102 if (ctx && ctx->no_psx_acl)
3103 cap &= ~CIFS_UNIX_POSIX_ACL_CAP;
3104 else if (CIFS_UNIX_POSIX_ACL_CAP & cap) {
3105 cifs_dbg(FYI, "negotiated posix acl support\n");
3106 if (cifs_sb)
3107 cifs_sb->mnt_cifs_flags |=
3108 CIFS_MOUNT_POSIXACL;
3109 }
3110
3111 if (ctx && ctx->posix_paths == 0)
3112 cap &= ~CIFS_UNIX_POSIX_PATHNAMES_CAP;
3113 else if (cap & CIFS_UNIX_POSIX_PATHNAMES_CAP) {
3114 cifs_dbg(FYI, "negotiate posix pathnames\n");
3115 if (cifs_sb)
3116 cifs_sb->mnt_cifs_flags |=
3117 CIFS_MOUNT_POSIX_PATHS;
3118 }
3119
3120 cifs_dbg(FYI, "Negotiate caps 0x%x\n", (int)cap);
3121#ifdef CONFIG_CIFS_DEBUG2
3122 if (cap & CIFS_UNIX_FCNTL_CAP)
3123 cifs_dbg(FYI, "FCNTL cap\n");
3124 if (cap & CIFS_UNIX_EXTATTR_CAP)
3125 cifs_dbg(FYI, "EXTATTR cap\n");
3126 if (cap & CIFS_UNIX_POSIX_PATHNAMES_CAP)
3127 cifs_dbg(FYI, "POSIX path cap\n");
3128 if (cap & CIFS_UNIX_XATTR_CAP)
3129 cifs_dbg(FYI, "XATTR cap\n");
3130 if (cap & CIFS_UNIX_POSIX_ACL_CAP)
3131 cifs_dbg(FYI, "POSIX ACL cap\n");
3132 if (cap & CIFS_UNIX_LARGE_READ_CAP)
3133 cifs_dbg(FYI, "very large read cap\n");
3134 if (cap & CIFS_UNIX_LARGE_WRITE_CAP)
3135 cifs_dbg(FYI, "very large write cap\n");
3136 if (cap & CIFS_UNIX_TRANSPORT_ENCRYPTION_CAP)
3137 cifs_dbg(FYI, "transport encryption cap\n");
3138 if (cap & CIFS_UNIX_TRANSPORT_ENCRYPTION_MANDATORY_CAP)
3139 cifs_dbg(FYI, "mandatory transport encryption cap\n");
3140#endif /* CIFS_DEBUG2 */
3141 if (CIFSSMBSetFSUnixInfo(xid, tcon, cap)) {
3142 if (ctx == NULL)
3143 cifs_dbg(FYI, "resetting capabilities failed\n");
3144 else
3145 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");
3146
3147 }
3148 }
3149}
3150#endif /* CONFIG_CIFS_ALLOW_INSECURE_LEGACY */
3151
3152int cifs_setup_cifs_sb(struct cifs_sb_info *cifs_sb)
3153{
3154 struct smb3_fs_context *ctx = cifs_sb->ctx;
3155
3156 INIT_DELAYED_WORK(&cifs_sb->prune_tlinks, cifs_prune_tlinks);
3157
3158 spin_lock_init(&cifs_sb->tlink_tree_lock);
3159 cifs_sb->tlink_tree = RB_ROOT;
3160
3161 cifs_dbg(FYI, "file mode: %04ho dir mode: %04ho\n",
3162 ctx->file_mode, ctx->dir_mode);
3163
3164 /* this is needed for ASCII cp to Unicode converts */
3165 if (ctx->iocharset == NULL) {
3166 /* load_nls_default cannot return null */
3167 cifs_sb->local_nls = load_nls_default();
3168 } else {
3169 cifs_sb->local_nls = load_nls(ctx->iocharset);
3170 if (cifs_sb->local_nls == NULL) {
3171 cifs_dbg(VFS, "CIFS mount error: iocharset %s not found\n",
3172 ctx->iocharset);
3173 return -ELIBACC;
3174 }
3175 }
3176 ctx->local_nls = cifs_sb->local_nls;
3177
3178 smb3_update_mnt_flags(cifs_sb);
3179
3180 if (ctx->direct_io)
3181 cifs_dbg(FYI, "mounting share using direct i/o\n");
3182 if (ctx->cache_ro) {
3183 cifs_dbg(VFS, "mounting share with read only caching. Ensure that the share will not be modified while in use.\n");
3184 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_RO_CACHE;
3185 } else if (ctx->cache_rw) {
3186 cifs_dbg(VFS, "mounting share in single client RW caching mode. Ensure that no other systems will be accessing the share.\n");
3187 cifs_sb->mnt_cifs_flags |= (CIFS_MOUNT_RO_CACHE |
3188 CIFS_MOUNT_RW_CACHE);
3189 }
3190
3191 if ((ctx->cifs_acl) && (ctx->dynperm))
3192 cifs_dbg(VFS, "mount option dynperm ignored if cifsacl mount option supported\n");
3193
3194 if (ctx->prepath) {
3195 cifs_sb->prepath = kstrdup(ctx->prepath, GFP_KERNEL);
3196 if (cifs_sb->prepath == NULL)
3197 return -ENOMEM;
3198 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_USE_PREFIX_PATH;
3199 }
3200
3201 return 0;
3202}
3203
3204/* Release all succeed connections */
3205void cifs_mount_put_conns(struct cifs_mount_ctx *mnt_ctx)
3206{
3207 int rc = 0;
3208
3209 if (mnt_ctx->tcon)
3210 cifs_put_tcon(mnt_ctx->tcon);
3211 else if (mnt_ctx->ses)
3212 cifs_put_smb_ses(mnt_ctx->ses);
3213 else if (mnt_ctx->server)
3214 cifs_put_tcp_session(mnt_ctx->server, 0);
3215 mnt_ctx->cifs_sb->mnt_cifs_flags &= ~CIFS_MOUNT_POSIX_PATHS;
3216 free_xid(mnt_ctx->xid);
3217}
3218
3219int cifs_mount_get_session(struct cifs_mount_ctx *mnt_ctx)
3220{
3221 struct TCP_Server_Info *server = NULL;
3222 struct smb3_fs_context *ctx;
3223 struct cifs_ses *ses = NULL;
3224 unsigned int xid;
3225 int rc = 0;
3226
3227 xid = get_xid();
3228
3229 if (WARN_ON_ONCE(!mnt_ctx || !mnt_ctx->fs_ctx)) {
3230 rc = -EINVAL;
3231 goto out;
3232 }
3233 ctx = mnt_ctx->fs_ctx;
3234
3235 /* get a reference to a tcp session */
3236 server = cifs_get_tcp_session(ctx, NULL);
3237 if (IS_ERR(server)) {
3238 rc = PTR_ERR(server);
3239 server = NULL;
3240 goto out;
3241 }
3242
3243 /* get a reference to a SMB session */
3244 ses = cifs_get_smb_ses(server, ctx);
3245 if (IS_ERR(ses)) {
3246 rc = PTR_ERR(ses);
3247 ses = NULL;
3248 goto out;
3249 }
3250
3251 if ((ctx->persistent == true) && (!(ses->server->capabilities &
3252 SMB2_GLOBAL_CAP_PERSISTENT_HANDLES))) {
3253 cifs_server_dbg(VFS, "persistent handles not supported by server\n");
3254 rc = -EOPNOTSUPP;
3255 }
3256
3257out:
3258 mnt_ctx->xid = xid;
3259 mnt_ctx->server = server;
3260 mnt_ctx->ses = ses;
3261 mnt_ctx->tcon = NULL;
3262
3263 return rc;
3264}
3265
3266int cifs_mount_get_tcon(struct cifs_mount_ctx *mnt_ctx)
3267{
3268 struct TCP_Server_Info *server;
3269 struct cifs_sb_info *cifs_sb;
3270 struct smb3_fs_context *ctx;
3271 struct cifs_tcon *tcon = NULL;
3272 int rc = 0;
3273
3274 if (WARN_ON_ONCE(!mnt_ctx || !mnt_ctx->server || !mnt_ctx->ses || !mnt_ctx->fs_ctx ||
3275 !mnt_ctx->cifs_sb)) {
3276 rc = -EINVAL;
3277 goto out;
3278 }
3279 server = mnt_ctx->server;
3280 ctx = mnt_ctx->fs_ctx;
3281 cifs_sb = mnt_ctx->cifs_sb;
3282
3283 /* search for existing tcon to this server share */
3284 tcon = cifs_get_tcon(mnt_ctx->ses, ctx);
3285 if (IS_ERR(tcon)) {
3286 rc = PTR_ERR(tcon);
3287 tcon = NULL;
3288 goto out;
3289 }
3290
3291 /* if new SMB3.11 POSIX extensions are supported do not remap / and \ */
3292 if (tcon->posix_extensions)
3293 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_POSIX_PATHS;
3294
3295#ifdef CONFIG_CIFS_ALLOW_INSECURE_LEGACY
3296 /* tell server which Unix caps we support */
3297 if (cap_unix(tcon->ses)) {
3298 /*
3299 * reset of caps checks mount to see if unix extensions disabled
3300 * for just this mount.
3301 */
3302 reset_cifs_unix_caps(mnt_ctx->xid, tcon, cifs_sb, ctx);
3303 spin_lock(&tcon->ses->server->srv_lock);
3304 if ((tcon->ses->server->tcpStatus == CifsNeedReconnect) &&
3305 (le64_to_cpu(tcon->fsUnixInfo.Capability) &
3306 CIFS_UNIX_TRANSPORT_ENCRYPTION_MANDATORY_CAP)) {
3307 spin_unlock(&tcon->ses->server->srv_lock);
3308 rc = -EACCES;
3309 goto out;
3310 }
3311 spin_unlock(&tcon->ses->server->srv_lock);
3312 } else
3313#endif /* CONFIG_CIFS_ALLOW_INSECURE_LEGACY */
3314 tcon->unix_ext = 0; /* server does not support them */
3315
3316 /* do not care if a following call succeed - informational */
3317 if (!tcon->pipe && server->ops->qfs_tcon) {
3318 server->ops->qfs_tcon(mnt_ctx->xid, tcon, cifs_sb);
3319 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_RO_CACHE) {
3320 if (tcon->fsDevInfo.DeviceCharacteristics &
3321 cpu_to_le32(FILE_READ_ONLY_DEVICE))
3322 cifs_dbg(VFS, "mounted to read only share\n");
3323 else if ((cifs_sb->mnt_cifs_flags &
3324 CIFS_MOUNT_RW_CACHE) == 0)
3325 cifs_dbg(VFS, "read only mount of RW share\n");
3326 /* no need to log a RW mount of a typical RW share */
3327 }
3328 }
3329
3330 /*
3331 * Clamp the rsize/wsize mount arguments if they are too big for the server
3332 * and set the rsize/wsize to the negotiated values if not passed in by
3333 * the user on mount
3334 */
3335 if ((cifs_sb->ctx->wsize == 0) ||
3336 (cifs_sb->ctx->wsize > server->ops->negotiate_wsize(tcon, ctx)))
3337 cifs_sb->ctx->wsize = server->ops->negotiate_wsize(tcon, ctx);
3338 if ((cifs_sb->ctx->rsize == 0) ||
3339 (cifs_sb->ctx->rsize > server->ops->negotiate_rsize(tcon, ctx)))
3340 cifs_sb->ctx->rsize = server->ops->negotiate_rsize(tcon, ctx);
3341
3342 /*
3343 * The cookie is initialized from volume info returned above.
3344 * Inside cifs_fscache_get_super_cookie it checks
3345 * that we do not get super cookie twice.
3346 */
3347 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_FSCACHE)
3348 cifs_fscache_get_super_cookie(tcon);
3349
3350out:
3351 mnt_ctx->tcon = tcon;
3352 return rc;
3353}
3354
3355static int mount_setup_tlink(struct cifs_sb_info *cifs_sb, struct cifs_ses *ses,
3356 struct cifs_tcon *tcon)
3357{
3358 struct tcon_link *tlink;
3359
3360 /* hang the tcon off of the superblock */
3361 tlink = kzalloc(sizeof(*tlink), GFP_KERNEL);
3362 if (tlink == NULL)
3363 return -ENOMEM;
3364
3365 tlink->tl_uid = ses->linux_uid;
3366 tlink->tl_tcon = tcon;
3367 tlink->tl_time = jiffies;
3368 set_bit(TCON_LINK_MASTER, &tlink->tl_flags);
3369 set_bit(TCON_LINK_IN_TREE, &tlink->tl_flags);
3370
3371 cifs_sb->master_tlink = tlink;
3372 spin_lock(&cifs_sb->tlink_tree_lock);
3373 tlink_rb_insert(&cifs_sb->tlink_tree, tlink);
3374 spin_unlock(&cifs_sb->tlink_tree_lock);
3375
3376 queue_delayed_work(cifsiod_wq, &cifs_sb->prune_tlinks,
3377 TLINK_IDLE_EXPIRE);
3378 return 0;
3379}
3380
3381static int
3382cifs_are_all_path_components_accessible(struct TCP_Server_Info *server,
3383 unsigned int xid,
3384 struct cifs_tcon *tcon,
3385 struct cifs_sb_info *cifs_sb,
3386 char *full_path,
3387 int added_treename)
3388{
3389 int rc;
3390 char *s;
3391 char sep, tmp;
3392 int skip = added_treename ? 1 : 0;
3393
3394 sep = CIFS_DIR_SEP(cifs_sb);
3395 s = full_path;
3396
3397 rc = server->ops->is_path_accessible(xid, tcon, cifs_sb, "");
3398 while (rc == 0) {
3399 /* skip separators */
3400 while (*s == sep)
3401 s++;
3402 if (!*s)
3403 break;
3404 /* next separator */
3405 while (*s && *s != sep)
3406 s++;
3407 /*
3408 * if the treename is added, we then have to skip the first
3409 * part within the separators
3410 */
3411 if (skip) {
3412 skip = 0;
3413 continue;
3414 }
3415 /*
3416 * temporarily null-terminate the path at the end of
3417 * the current component
3418 */
3419 tmp = *s;
3420 *s = 0;
3421 rc = server->ops->is_path_accessible(xid, tcon, cifs_sb,
3422 full_path);
3423 *s = tmp;
3424 }
3425 return rc;
3426}
3427
3428/*
3429 * Check if path is remote (i.e. a DFS share).
3430 *
3431 * Return -EREMOTE if it is, otherwise 0 or -errno.
3432 */
3433int cifs_is_path_remote(struct cifs_mount_ctx *mnt_ctx)
3434{
3435 int rc;
3436 struct cifs_sb_info *cifs_sb = mnt_ctx->cifs_sb;
3437 struct TCP_Server_Info *server = mnt_ctx->server;
3438 unsigned int xid = mnt_ctx->xid;
3439 struct cifs_tcon *tcon = mnt_ctx->tcon;
3440 struct smb3_fs_context *ctx = mnt_ctx->fs_ctx;
3441 char *full_path;
3442
3443 if (!server->ops->is_path_accessible)
3444 return -EOPNOTSUPP;
3445
3446 /*
3447 * cifs_build_path_to_root works only when we have a valid tcon
3448 */
3449 full_path = cifs_build_path_to_root(ctx, cifs_sb, tcon,
3450 tcon->Flags & SMB_SHARE_IS_IN_DFS);
3451 if (full_path == NULL)
3452 return -ENOMEM;
3453
3454 cifs_dbg(FYI, "%s: full_path: %s\n", __func__, full_path);
3455
3456 rc = server->ops->is_path_accessible(xid, tcon, cifs_sb,
3457 full_path);
3458 if (rc != 0 && rc != -EREMOTE)
3459 goto out;
3460
3461 if (rc != -EREMOTE) {
3462 rc = cifs_are_all_path_components_accessible(server, xid, tcon,
3463 cifs_sb, full_path, tcon->Flags & SMB_SHARE_IS_IN_DFS);
3464 if (rc != 0) {
3465 cifs_server_dbg(VFS, "cannot query dirs between root and final path, enabling CIFS_MOUNT_USE_PREFIX_PATH\n");
3466 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_USE_PREFIX_PATH;
3467 rc = 0;
3468 }
3469 }
3470
3471out:
3472 kfree(full_path);
3473 return rc;
3474}
3475
3476#ifdef CONFIG_CIFS_DFS_UPCALL
3477int cifs_mount(struct cifs_sb_info *cifs_sb, struct smb3_fs_context *ctx)
3478{
3479 struct cifs_mount_ctx mnt_ctx = { .cifs_sb = cifs_sb, .fs_ctx = ctx, };
3480 bool isdfs;
3481 int rc;
3482
3483 uuid_gen(&mnt_ctx.mount_id);
3484 rc = dfs_mount_share(&mnt_ctx, &isdfs);
3485 if (rc)
3486 goto error;
3487 if (!isdfs)
3488 goto out;
3489
3490 /*
3491 * After reconnecting to a different server, unique ids won't match anymore, so we disable
3492 * serverino. This prevents dentry revalidation to think the dentry are stale (ESTALE).
3493 */
3494 cifs_autodisable_serverino(cifs_sb);
3495 /*
3496 * Force the use of prefix path to support failover on DFS paths that resolve to targets
3497 * that have different prefix paths.
3498 */
3499 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_USE_PREFIX_PATH;
3500 kfree(cifs_sb->prepath);
3501 cifs_sb->prepath = ctx->prepath;
3502 ctx->prepath = NULL;
3503 uuid_copy(&cifs_sb->dfs_mount_id, &mnt_ctx.mount_id);
3504
3505out:
3506 cifs_try_adding_channels(cifs_sb, mnt_ctx.ses);
3507 rc = mount_setup_tlink(cifs_sb, mnt_ctx.ses, mnt_ctx.tcon);
3508 if (rc)
3509 goto error;
3510
3511 free_xid(mnt_ctx.xid);
3512 return rc;
3513
3514error:
3515 dfs_cache_put_refsrv_sessions(&mnt_ctx.mount_id);
3516 kfree(mnt_ctx.origin_fullpath);
3517 kfree(mnt_ctx.leaf_fullpath);
3518 cifs_mount_put_conns(&mnt_ctx);
3519 return rc;
3520}
3521#else
3522int cifs_mount(struct cifs_sb_info *cifs_sb, struct smb3_fs_context *ctx)
3523{
3524 int rc = 0;
3525 struct cifs_mount_ctx mnt_ctx = { .cifs_sb = cifs_sb, .fs_ctx = ctx, };
3526
3527 rc = cifs_mount_get_session(&mnt_ctx);
3528 if (rc)
3529 goto error;
3530
3531 rc = cifs_mount_get_tcon(&mnt_ctx);
3532 if (rc)
3533 goto error;
3534
3535 rc = cifs_is_path_remote(&mnt_ctx);
3536 if (rc == -EREMOTE)
3537 rc = -EOPNOTSUPP;
3538 if (rc)
3539 goto error;
3540
3541 rc = mount_setup_tlink(cifs_sb, mnt_ctx.ses, mnt_ctx.tcon);
3542 if (rc)
3543 goto error;
3544
3545 free_xid(mnt_ctx.xid);
3546 return rc;
3547
3548error:
3549 cifs_mount_put_conns(&mnt_ctx);
3550 return rc;
3551}
3552#endif
3553
3554/*
3555 * Issue a TREE_CONNECT request.
3556 */
3557int
3558CIFSTCon(const unsigned int xid, struct cifs_ses *ses,
3559 const char *tree, struct cifs_tcon *tcon,
3560 const struct nls_table *nls_codepage)
3561{
3562 struct smb_hdr *smb_buffer;
3563 struct smb_hdr *smb_buffer_response;
3564 TCONX_REQ *pSMB;
3565 TCONX_RSP *pSMBr;
3566 unsigned char *bcc_ptr;
3567 int rc = 0;
3568 int length;
3569 __u16 bytes_left, count;
3570
3571 if (ses == NULL)
3572 return -EIO;
3573
3574 smb_buffer = cifs_buf_get();
3575 if (smb_buffer == NULL)
3576 return -ENOMEM;
3577
3578 smb_buffer_response = smb_buffer;
3579
3580 header_assemble(smb_buffer, SMB_COM_TREE_CONNECT_ANDX,
3581 NULL /*no tid */ , 4 /*wct */ );
3582
3583 smb_buffer->Mid = get_next_mid(ses->server);
3584 smb_buffer->Uid = ses->Suid;
3585 pSMB = (TCONX_REQ *) smb_buffer;
3586 pSMBr = (TCONX_RSP *) smb_buffer_response;
3587
3588 pSMB->AndXCommand = 0xFF;
3589 pSMB->Flags = cpu_to_le16(TCON_EXTENDED_SECINFO);
3590 bcc_ptr = &pSMB->Password[0];
3591
3592 pSMB->PasswordLength = cpu_to_le16(1); /* minimum */
3593 *bcc_ptr = 0; /* password is null byte */
3594 bcc_ptr++; /* skip password */
3595 /* already aligned so no need to do it below */
3596
3597 if (ses->server->sign)
3598 smb_buffer->Flags2 |= SMBFLG2_SECURITY_SIGNATURE;
3599
3600 if (ses->capabilities & CAP_STATUS32) {
3601 smb_buffer->Flags2 |= SMBFLG2_ERR_STATUS;
3602 }
3603 if (ses->capabilities & CAP_DFS) {
3604 smb_buffer->Flags2 |= SMBFLG2_DFS;
3605 }
3606 if (ses->capabilities & CAP_UNICODE) {
3607 smb_buffer->Flags2 |= SMBFLG2_UNICODE;
3608 length =
3609 cifs_strtoUTF16((__le16 *) bcc_ptr, tree,
3610 6 /* max utf8 char length in bytes */ *
3611 (/* server len*/ + 256 /* share len */), nls_codepage);
3612 bcc_ptr += 2 * length; /* convert num 16 bit words to bytes */
3613 bcc_ptr += 2; /* skip trailing null */
3614 } else { /* ASCII */
3615 strcpy(bcc_ptr, tree);
3616 bcc_ptr += strlen(tree) + 1;
3617 }
3618 strcpy(bcc_ptr, "?????");
3619 bcc_ptr += strlen("?????");
3620 bcc_ptr += 1;
3621 count = bcc_ptr - &pSMB->Password[0];
3622 be32_add_cpu(&pSMB->hdr.smb_buf_length, count);
3623 pSMB->ByteCount = cpu_to_le16(count);
3624
3625 rc = SendReceive(xid, ses, smb_buffer, smb_buffer_response, &length,
3626 0);
3627
3628 /* above now done in SendReceive */
3629 if (rc == 0) {
3630 bool is_unicode;
3631
3632 tcon->tid = smb_buffer_response->Tid;
3633 bcc_ptr = pByteArea(smb_buffer_response);
3634 bytes_left = get_bcc(smb_buffer_response);
3635 length = strnlen(bcc_ptr, bytes_left - 2);
3636 if (smb_buffer->Flags2 & SMBFLG2_UNICODE)
3637 is_unicode = true;
3638 else
3639 is_unicode = false;
3640
3641
3642 /* skip service field (NB: this field is always ASCII) */
3643 if (length == 3) {
3644 if ((bcc_ptr[0] == 'I') && (bcc_ptr[1] == 'P') &&
3645 (bcc_ptr[2] == 'C')) {
3646 cifs_dbg(FYI, "IPC connection\n");
3647 tcon->ipc = true;
3648 tcon->pipe = true;
3649 }
3650 } else if (length == 2) {
3651 if ((bcc_ptr[0] == 'A') && (bcc_ptr[1] == ':')) {
3652 /* the most common case */
3653 cifs_dbg(FYI, "disk share connection\n");
3654 }
3655 }
3656 bcc_ptr += length + 1;
3657 bytes_left -= (length + 1);
3658 strscpy(tcon->tree_name, tree, sizeof(tcon->tree_name));
3659
3660 /* mostly informational -- no need to fail on error here */
3661 kfree(tcon->nativeFileSystem);
3662 tcon->nativeFileSystem = cifs_strndup_from_utf16(bcc_ptr,
3663 bytes_left, is_unicode,
3664 nls_codepage);
3665
3666 cifs_dbg(FYI, "nativeFileSystem=%s\n", tcon->nativeFileSystem);
3667
3668 if ((smb_buffer_response->WordCount == 3) ||
3669 (smb_buffer_response->WordCount == 7))
3670 /* field is in same location */
3671 tcon->Flags = le16_to_cpu(pSMBr->OptionalSupport);
3672 else
3673 tcon->Flags = 0;
3674 cifs_dbg(FYI, "Tcon flags: 0x%x\n", tcon->Flags);
3675 }
3676
3677 cifs_buf_release(smb_buffer);
3678 return rc;
3679}
3680
3681static void delayed_free(struct rcu_head *p)
3682{
3683 struct cifs_sb_info *cifs_sb = container_of(p, struct cifs_sb_info, rcu);
3684
3685 unload_nls(cifs_sb->local_nls);
3686 smb3_cleanup_fs_context(cifs_sb->ctx);
3687 kfree(cifs_sb);
3688}
3689
3690void
3691cifs_umount(struct cifs_sb_info *cifs_sb)
3692{
3693 struct rb_root *root = &cifs_sb->tlink_tree;
3694 struct rb_node *node;
3695 struct tcon_link *tlink;
3696
3697 cancel_delayed_work_sync(&cifs_sb->prune_tlinks);
3698
3699 spin_lock(&cifs_sb->tlink_tree_lock);
3700 while ((node = rb_first(root))) {
3701 tlink = rb_entry(node, struct tcon_link, tl_rbnode);
3702 cifs_get_tlink(tlink);
3703 clear_bit(TCON_LINK_IN_TREE, &tlink->tl_flags);
3704 rb_erase(node, root);
3705
3706 spin_unlock(&cifs_sb->tlink_tree_lock);
3707 cifs_put_tlink(tlink);
3708 spin_lock(&cifs_sb->tlink_tree_lock);
3709 }
3710 spin_unlock(&cifs_sb->tlink_tree_lock);
3711
3712 kfree(cifs_sb->prepath);
3713#ifdef CONFIG_CIFS_DFS_UPCALL
3714 dfs_cache_put_refsrv_sessions(&cifs_sb->dfs_mount_id);
3715#endif
3716 call_rcu(&cifs_sb->rcu, delayed_free);
3717}
3718
3719int
3720cifs_negotiate_protocol(const unsigned int xid, struct cifs_ses *ses,
3721 struct TCP_Server_Info *server)
3722{
3723 int rc = 0;
3724
3725 if (!server->ops->need_neg || !server->ops->negotiate)
3726 return -ENOSYS;
3727
3728 /* only send once per connect */
3729 spin_lock(&server->srv_lock);
3730 if (!server->ops->need_neg(server) ||
3731 server->tcpStatus != CifsNeedNegotiate) {
3732 spin_unlock(&server->srv_lock);
3733 return 0;
3734 }
3735 server->tcpStatus = CifsInNegotiate;
3736 spin_unlock(&server->srv_lock);
3737
3738 rc = server->ops->negotiate(xid, ses, server);
3739 if (rc == 0) {
3740 spin_lock(&server->srv_lock);
3741 if (server->tcpStatus == CifsInNegotiate)
3742 server->tcpStatus = CifsGood;
3743 else
3744 rc = -EHOSTDOWN;
3745 spin_unlock(&server->srv_lock);
3746 } else {
3747 spin_lock(&server->srv_lock);
3748 if (server->tcpStatus == CifsInNegotiate)
3749 server->tcpStatus = CifsNeedNegotiate;
3750 spin_unlock(&server->srv_lock);
3751 }
3752
3753 return rc;
3754}
3755
3756int
3757cifs_setup_session(const unsigned int xid, struct cifs_ses *ses,
3758 struct TCP_Server_Info *server,
3759 struct nls_table *nls_info)
3760{
3761 int rc = -ENOSYS;
3762 struct sockaddr_in6 *addr6 = (struct sockaddr_in6 *)&server->dstaddr;
3763 struct sockaddr_in *addr = (struct sockaddr_in *)&server->dstaddr;
3764 bool is_binding = false;
3765
3766 spin_lock(&ses->ses_lock);
3767 if (server->dstaddr.ss_family == AF_INET6)
3768 scnprintf(ses->ip_addr, sizeof(ses->ip_addr), "%pI6", &addr6->sin6_addr);
3769 else
3770 scnprintf(ses->ip_addr, sizeof(ses->ip_addr), "%pI4", &addr->sin_addr);
3771
3772 if (ses->ses_status != SES_GOOD &&
3773 ses->ses_status != SES_NEW &&
3774 ses->ses_status != SES_NEED_RECON) {
3775 spin_unlock(&ses->ses_lock);
3776 return 0;
3777 }
3778
3779 /* only send once per connect */
3780 spin_lock(&ses->chan_lock);
3781 if (CIFS_ALL_CHANS_GOOD(ses) ||
3782 cifs_chan_in_reconnect(ses, server)) {
3783 spin_unlock(&ses->chan_lock);
3784 spin_unlock(&ses->ses_lock);
3785 return 0;
3786 }
3787 is_binding = !CIFS_ALL_CHANS_NEED_RECONNECT(ses);
3788 cifs_chan_set_in_reconnect(ses, server);
3789 spin_unlock(&ses->chan_lock);
3790
3791 if (!is_binding)
3792 ses->ses_status = SES_IN_SETUP;
3793 spin_unlock(&ses->ses_lock);
3794
3795 if (!is_binding) {
3796 ses->capabilities = server->capabilities;
3797 if (!linuxExtEnabled)
3798 ses->capabilities &= (~server->vals->cap_unix);
3799
3800 if (ses->auth_key.response) {
3801 cifs_dbg(FYI, "Free previous auth_key.response = %p\n",
3802 ses->auth_key.response);
3803 kfree_sensitive(ses->auth_key.response);
3804 ses->auth_key.response = NULL;
3805 ses->auth_key.len = 0;
3806 }
3807 }
3808
3809 cifs_dbg(FYI, "Security Mode: 0x%x Capabilities: 0x%x TimeAdjust: %d\n",
3810 server->sec_mode, server->capabilities, server->timeAdj);
3811
3812 if (server->ops->sess_setup)
3813 rc = server->ops->sess_setup(xid, ses, server, nls_info);
3814
3815 if (rc) {
3816 cifs_server_dbg(VFS, "Send error in SessSetup = %d\n", rc);
3817 spin_lock(&ses->ses_lock);
3818 if (ses->ses_status == SES_IN_SETUP)
3819 ses->ses_status = SES_NEED_RECON;
3820 spin_lock(&ses->chan_lock);
3821 cifs_chan_clear_in_reconnect(ses, server);
3822 spin_unlock(&ses->chan_lock);
3823 spin_unlock(&ses->ses_lock);
3824 } else {
3825 spin_lock(&ses->ses_lock);
3826 if (ses->ses_status == SES_IN_SETUP)
3827 ses->ses_status = SES_GOOD;
3828 spin_lock(&ses->chan_lock);
3829 cifs_chan_clear_in_reconnect(ses, server);
3830 cifs_chan_clear_need_reconnect(ses, server);
3831 spin_unlock(&ses->chan_lock);
3832 spin_unlock(&ses->ses_lock);
3833 }
3834
3835 return rc;
3836}
3837
3838static int
3839cifs_set_vol_auth(struct smb3_fs_context *ctx, struct cifs_ses *ses)
3840{
3841 ctx->sectype = ses->sectype;
3842
3843 /* krb5 is special, since we don't need username or pw */
3844 if (ctx->sectype == Kerberos)
3845 return 0;
3846
3847 return cifs_set_cifscreds(ctx, ses);
3848}
3849
3850static struct cifs_tcon *
3851cifs_construct_tcon(struct cifs_sb_info *cifs_sb, kuid_t fsuid)
3852{
3853 int rc;
3854 struct cifs_tcon *master_tcon = cifs_sb_master_tcon(cifs_sb);
3855 struct cifs_ses *ses;
3856 struct cifs_tcon *tcon = NULL;
3857 struct smb3_fs_context *ctx;
3858
3859 ctx = kzalloc(sizeof(*ctx), GFP_KERNEL);
3860 if (ctx == NULL)
3861 return ERR_PTR(-ENOMEM);
3862
3863 ctx->local_nls = cifs_sb->local_nls;
3864 ctx->linux_uid = fsuid;
3865 ctx->cred_uid = fsuid;
3866 ctx->UNC = master_tcon->tree_name;
3867 ctx->retry = master_tcon->retry;
3868 ctx->nocase = master_tcon->nocase;
3869 ctx->nohandlecache = master_tcon->nohandlecache;
3870 ctx->local_lease = master_tcon->local_lease;
3871 ctx->no_lease = master_tcon->no_lease;
3872 ctx->resilient = master_tcon->use_resilient;
3873 ctx->persistent = master_tcon->use_persistent;
3874 ctx->handle_timeout = master_tcon->handle_timeout;
3875 ctx->no_linux_ext = !master_tcon->unix_ext;
3876 ctx->linux_ext = master_tcon->posix_extensions;
3877 ctx->sectype = master_tcon->ses->sectype;
3878 ctx->sign = master_tcon->ses->sign;
3879 ctx->seal = master_tcon->seal;
3880 ctx->witness = master_tcon->use_witness;
3881
3882 rc = cifs_set_vol_auth(ctx, master_tcon->ses);
3883 if (rc) {
3884 tcon = ERR_PTR(rc);
3885 goto out;
3886 }
3887
3888 /* get a reference for the same TCP session */
3889 spin_lock(&cifs_tcp_ses_lock);
3890 ++master_tcon->ses->server->srv_count;
3891 spin_unlock(&cifs_tcp_ses_lock);
3892
3893 ses = cifs_get_smb_ses(master_tcon->ses->server, ctx);
3894 if (IS_ERR(ses)) {
3895 tcon = (struct cifs_tcon *)ses;
3896 cifs_put_tcp_session(master_tcon->ses->server, 0);
3897 goto out;
3898 }
3899
3900 tcon = cifs_get_tcon(ses, ctx);
3901 if (IS_ERR(tcon)) {
3902 cifs_put_smb_ses(ses);
3903 goto out;
3904 }
3905
3906#ifdef CONFIG_CIFS_ALLOW_INSECURE_LEGACY
3907 if (cap_unix(ses))
3908 reset_cifs_unix_caps(0, tcon, NULL, ctx);
3909#endif /* CONFIG_CIFS_ALLOW_INSECURE_LEGACY */
3910
3911out:
3912 kfree(ctx->username);
3913 kfree_sensitive(ctx->password);
3914 kfree(ctx);
3915
3916 return tcon;
3917}
3918
3919struct cifs_tcon *
3920cifs_sb_master_tcon(struct cifs_sb_info *cifs_sb)
3921{
3922 return tlink_tcon(cifs_sb_master_tlink(cifs_sb));
3923}
3924
3925/* find and return a tlink with given uid */
3926static struct tcon_link *
3927tlink_rb_search(struct rb_root *root, kuid_t uid)
3928{
3929 struct rb_node *node = root->rb_node;
3930 struct tcon_link *tlink;
3931
3932 while (node) {
3933 tlink = rb_entry(node, struct tcon_link, tl_rbnode);
3934
3935 if (uid_gt(tlink->tl_uid, uid))
3936 node = node->rb_left;
3937 else if (uid_lt(tlink->tl_uid, uid))
3938 node = node->rb_right;
3939 else
3940 return tlink;
3941 }
3942 return NULL;
3943}
3944
3945/* insert a tcon_link into the tree */
3946static void
3947tlink_rb_insert(struct rb_root *root, struct tcon_link *new_tlink)
3948{
3949 struct rb_node **new = &(root->rb_node), *parent = NULL;
3950 struct tcon_link *tlink;
3951
3952 while (*new) {
3953 tlink = rb_entry(*new, struct tcon_link, tl_rbnode);
3954 parent = *new;
3955
3956 if (uid_gt(tlink->tl_uid, new_tlink->tl_uid))
3957 new = &((*new)->rb_left);
3958 else
3959 new = &((*new)->rb_right);
3960 }
3961
3962 rb_link_node(&new_tlink->tl_rbnode, parent, new);
3963 rb_insert_color(&new_tlink->tl_rbnode, root);
3964}
3965
3966/*
3967 * Find or construct an appropriate tcon given a cifs_sb and the fsuid of the
3968 * current task.
3969 *
3970 * If the superblock doesn't refer to a multiuser mount, then just return
3971 * the master tcon for the mount.
3972 *
3973 * First, search the rbtree for an existing tcon for this fsuid. If one
3974 * exists, then check to see if it's pending construction. If it is then wait
3975 * for construction to complete. Once it's no longer pending, check to see if
3976 * it failed and either return an error or retry construction, depending on
3977 * the timeout.
3978 *
3979 * If one doesn't exist then insert a new tcon_link struct into the tree and
3980 * try to construct a new one.
3981 */
3982struct tcon_link *
3983cifs_sb_tlink(struct cifs_sb_info *cifs_sb)
3984{
3985 int ret;
3986 kuid_t fsuid = current_fsuid();
3987 struct tcon_link *tlink, *newtlink;
3988
3989 if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MULTIUSER))
3990 return cifs_get_tlink(cifs_sb_master_tlink(cifs_sb));
3991
3992 spin_lock(&cifs_sb->tlink_tree_lock);
3993 tlink = tlink_rb_search(&cifs_sb->tlink_tree, fsuid);
3994 if (tlink)
3995 cifs_get_tlink(tlink);
3996 spin_unlock(&cifs_sb->tlink_tree_lock);
3997
3998 if (tlink == NULL) {
3999 newtlink = kzalloc(sizeof(*tlink), GFP_KERNEL);
4000 if (newtlink == NULL)
4001 return ERR_PTR(-ENOMEM);
4002 newtlink->tl_uid = fsuid;
4003 newtlink->tl_tcon = ERR_PTR(-EACCES);
4004 set_bit(TCON_LINK_PENDING, &newtlink->tl_flags);
4005 set_bit(TCON_LINK_IN_TREE, &newtlink->tl_flags);
4006 cifs_get_tlink(newtlink);
4007
4008 spin_lock(&cifs_sb->tlink_tree_lock);
4009 /* was one inserted after previous search? */
4010 tlink = tlink_rb_search(&cifs_sb->tlink_tree, fsuid);
4011 if (tlink) {
4012 cifs_get_tlink(tlink);
4013 spin_unlock(&cifs_sb->tlink_tree_lock);
4014 kfree(newtlink);
4015 goto wait_for_construction;
4016 }
4017 tlink = newtlink;
4018 tlink_rb_insert(&cifs_sb->tlink_tree, tlink);
4019 spin_unlock(&cifs_sb->tlink_tree_lock);
4020 } else {
4021wait_for_construction:
4022 ret = wait_on_bit(&tlink->tl_flags, TCON_LINK_PENDING,
4023 TASK_INTERRUPTIBLE);
4024 if (ret) {
4025 cifs_put_tlink(tlink);
4026 return ERR_PTR(-ERESTARTSYS);
4027 }
4028
4029 /* if it's good, return it */
4030 if (!IS_ERR(tlink->tl_tcon))
4031 return tlink;
4032
4033 /* return error if we tried this already recently */
4034 if (time_before(jiffies, tlink->tl_time + TLINK_ERROR_EXPIRE)) {
4035 cifs_put_tlink(tlink);
4036 return ERR_PTR(-EACCES);
4037 }
4038
4039 if (test_and_set_bit(TCON_LINK_PENDING, &tlink->tl_flags))
4040 goto wait_for_construction;
4041 }
4042
4043 tlink->tl_tcon = cifs_construct_tcon(cifs_sb, fsuid);
4044 clear_bit(TCON_LINK_PENDING, &tlink->tl_flags);
4045 wake_up_bit(&tlink->tl_flags, TCON_LINK_PENDING);
4046
4047 if (IS_ERR(tlink->tl_tcon)) {
4048 cifs_put_tlink(tlink);
4049 return ERR_PTR(-EACCES);
4050 }
4051
4052 return tlink;
4053}
4054
4055/*
4056 * periodic workqueue job that scans tcon_tree for a superblock and closes
4057 * out tcons.
4058 */
4059static void
4060cifs_prune_tlinks(struct work_struct *work)
4061{
4062 struct cifs_sb_info *cifs_sb = container_of(work, struct cifs_sb_info,
4063 prune_tlinks.work);
4064 struct rb_root *root = &cifs_sb->tlink_tree;
4065 struct rb_node *node;
4066 struct rb_node *tmp;
4067 struct tcon_link *tlink;
4068
4069 /*
4070 * Because we drop the spinlock in the loop in order to put the tlink
4071 * it's not guarded against removal of links from the tree. The only
4072 * places that remove entries from the tree are this function and
4073 * umounts. Because this function is non-reentrant and is canceled
4074 * before umount can proceed, this is safe.
4075 */
4076 spin_lock(&cifs_sb->tlink_tree_lock);
4077 node = rb_first(root);
4078 while (node != NULL) {
4079 tmp = node;
4080 node = rb_next(tmp);
4081 tlink = rb_entry(tmp, struct tcon_link, tl_rbnode);
4082
4083 if (test_bit(TCON_LINK_MASTER, &tlink->tl_flags) ||
4084 atomic_read(&tlink->tl_count) != 0 ||
4085 time_after(tlink->tl_time + TLINK_IDLE_EXPIRE, jiffies))
4086 continue;
4087
4088 cifs_get_tlink(tlink);
4089 clear_bit(TCON_LINK_IN_TREE, &tlink->tl_flags);
4090 rb_erase(tmp, root);
4091
4092 spin_unlock(&cifs_sb->tlink_tree_lock);
4093 cifs_put_tlink(tlink);
4094 spin_lock(&cifs_sb->tlink_tree_lock);
4095 }
4096 spin_unlock(&cifs_sb->tlink_tree_lock);
4097
4098 queue_delayed_work(cifsiod_wq, &cifs_sb->prune_tlinks,
4099 TLINK_IDLE_EXPIRE);
4100}
4101
4102#ifndef CONFIG_CIFS_DFS_UPCALL
4103int cifs_tree_connect(const unsigned int xid, struct cifs_tcon *tcon, const struct nls_table *nlsc)
4104{
4105 int rc;
4106 const struct smb_version_operations *ops = tcon->ses->server->ops;
4107
4108 /* only send once per connect */
4109 spin_lock(&tcon->tc_lock);
4110 if (tcon->ses->ses_status != SES_GOOD ||
4111 (tcon->status != TID_NEW &&
4112 tcon->status != TID_NEED_TCON)) {
4113 spin_unlock(&tcon->tc_lock);
4114 return 0;
4115 }
4116 tcon->status = TID_IN_TCON;
4117 spin_unlock(&tcon->tc_lock);
4118
4119 rc = ops->tree_connect(xid, tcon->ses, tcon->tree_name, tcon, nlsc);
4120 if (rc) {
4121 spin_lock(&tcon->tc_lock);
4122 if (tcon->status == TID_IN_TCON)
4123 tcon->status = TID_NEED_TCON;
4124 spin_unlock(&tcon->tc_lock);
4125 } else {
4126 spin_lock(&tcon->tc_lock);
4127 if (tcon->status == TID_IN_TCON)
4128 tcon->status = TID_GOOD;
4129 tcon->need_reconnect = false;
4130 spin_unlock(&tcon->tc_lock);
4131 }
4132
4133 return rc;
4134}
4135#endif
1// SPDX-License-Identifier: LGPL-2.1
2/*
3 *
4 * Copyright (C) International Business Machines Corp., 2002,2011
5 * Author(s): Steve French (sfrench@us.ibm.com)
6 *
7 */
8#include <linux/fs.h>
9#include <linux/net.h>
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>
32#include <net/ipv6.h>
33#include <linux/parser.h>
34#include <linux/bvec.h>
35#include "cifspdu.h"
36#include "cifsglob.h"
37#include "cifsproto.h"
38#include "cifs_unicode.h"
39#include "cifs_debug.h"
40#include "cifs_fs_sb.h"
41#include "ntlmssp.h"
42#include "nterr.h"
43#include "rfc1002pdu.h"
44#include "fscache.h"
45#include "smb2proto.h"
46#include "smbdirect.h"
47#include "dns_resolve.h"
48#ifdef CONFIG_CIFS_DFS_UPCALL
49#include "dfs.h"
50#include "dfs_cache.h"
51#endif
52#include "fs_context.h"
53#include "cifs_swn.h"
54
55extern mempool_t *cifs_req_poolp;
56extern bool disable_legacy_dialects;
57
58/* FIXME: should these be tunable? */
59#define TLINK_ERROR_EXPIRE (1 * HZ)
60#define TLINK_IDLE_EXPIRE (600 * HZ)
61
62/* Drop the connection to not overload the server */
63#define NUM_STATUS_IO_TIMEOUT 5
64
65static int ip_connect(struct TCP_Server_Info *server);
66static int generic_ip_connect(struct TCP_Server_Info *server);
67static void tlink_rb_insert(struct rb_root *root, struct tcon_link *new_tlink);
68static void cifs_prune_tlinks(struct work_struct *work);
69
70/*
71 * Resolve hostname and set ip addr in tcp ses. Useful for hostnames that may
72 * get their ip addresses changed at some point.
73 *
74 * This should be called with server->srv_mutex held.
75 */
76static int reconn_set_ipaddr_from_hostname(struct TCP_Server_Info *server)
77{
78 int rc;
79 int len;
80 char *unc;
81 struct sockaddr_storage ss;
82 time64_t expiry, now;
83 unsigned long ttl = SMB_DNS_RESOLVE_INTERVAL_DEFAULT;
84
85 if (!server->hostname)
86 return -EINVAL;
87
88 /* if server hostname isn't populated, there's nothing to do here */
89 if (server->hostname[0] == '\0')
90 return 0;
91
92 len = strlen(server->hostname) + 3;
93
94 unc = kmalloc(len, GFP_KERNEL);
95 if (!unc) {
96 cifs_dbg(FYI, "%s: failed to create UNC path\n", __func__);
97 return -ENOMEM;
98 }
99 scnprintf(unc, len, "\\\\%s", server->hostname);
100
101 spin_lock(&server->srv_lock);
102 ss = server->dstaddr;
103 spin_unlock(&server->srv_lock);
104
105 rc = dns_resolve_server_name_to_ip(unc, (struct sockaddr *)&ss, &expiry);
106 kfree(unc);
107
108 if (rc < 0) {
109 cifs_dbg(FYI, "%s: failed to resolve server part of %s to IP: %d\n",
110 __func__, server->hostname, rc);
111 goto requeue_resolve;
112 }
113
114 spin_lock(&server->srv_lock);
115 memcpy(&server->dstaddr, &ss, sizeof(server->dstaddr));
116 spin_unlock(&server->srv_lock);
117
118 now = ktime_get_real_seconds();
119 if (expiry && expiry > now)
120 /* To make sure we don't use the cached entry, retry 1s */
121 ttl = max_t(unsigned long, expiry - now, SMB_DNS_RESOLVE_INTERVAL_MIN) + 1;
122
123requeue_resolve:
124 cifs_dbg(FYI, "%s: next dns resolution scheduled for %lu seconds in the future\n",
125 __func__, ttl);
126 mod_delayed_work(cifsiod_wq, &server->resolve, (ttl * HZ));
127
128 return rc;
129}
130
131static void smb2_query_server_interfaces(struct work_struct *work)
132{
133 int rc;
134 struct cifs_tcon *tcon = container_of(work,
135 struct cifs_tcon,
136 query_interfaces.work);
137
138 /*
139 * query server network interfaces, in case they change
140 */
141 rc = SMB3_request_interfaces(0, tcon, false);
142 if (rc) {
143 cifs_dbg(FYI, "%s: failed to query server interfaces: %d\n",
144 __func__, rc);
145 }
146
147 queue_delayed_work(cifsiod_wq, &tcon->query_interfaces,
148 (SMB_INTERFACE_POLL_INTERVAL * HZ));
149}
150
151static void cifs_resolve_server(struct work_struct *work)
152{
153 int rc;
154 struct TCP_Server_Info *server = container_of(work,
155 struct TCP_Server_Info, resolve.work);
156
157 cifs_server_lock(server);
158
159 /*
160 * Resolve the hostname again to make sure that IP address is up-to-date.
161 */
162 rc = reconn_set_ipaddr_from_hostname(server);
163 if (rc) {
164 cifs_dbg(FYI, "%s: failed to resolve hostname: %d\n",
165 __func__, rc);
166 }
167
168 cifs_server_unlock(server);
169}
170
171/*
172 * Update the tcpStatus for the server.
173 * This is used to signal the cifsd thread to call cifs_reconnect
174 * ONLY cifsd thread should call cifs_reconnect. For any other
175 * thread, use this function
176 *
177 * @server: the tcp ses for which reconnect is needed
178 * @all_channels: if this needs to be done for all channels
179 */
180void
181cifs_signal_cifsd_for_reconnect(struct TCP_Server_Info *server,
182 bool all_channels)
183{
184 struct TCP_Server_Info *pserver;
185 struct cifs_ses *ses;
186 int i;
187
188 /* If server is a channel, select the primary channel */
189 pserver = CIFS_SERVER_IS_CHAN(server) ? server->primary_server : server;
190
191 spin_lock(&pserver->srv_lock);
192 if (!all_channels) {
193 pserver->tcpStatus = CifsNeedReconnect;
194 spin_unlock(&pserver->srv_lock);
195 return;
196 }
197 spin_unlock(&pserver->srv_lock);
198
199 spin_lock(&cifs_tcp_ses_lock);
200 list_for_each_entry(ses, &pserver->smb_ses_list, smb_ses_list) {
201 spin_lock(&ses->chan_lock);
202 for (i = 0; i < ses->chan_count; i++) {
203 spin_lock(&ses->chans[i].server->srv_lock);
204 ses->chans[i].server->tcpStatus = CifsNeedReconnect;
205 spin_unlock(&ses->chans[i].server->srv_lock);
206 }
207 spin_unlock(&ses->chan_lock);
208 }
209 spin_unlock(&cifs_tcp_ses_lock);
210}
211
212/*
213 * Mark all sessions and tcons for reconnect.
214 * IMPORTANT: make sure that this gets called only from
215 * cifsd thread. For any other thread, use
216 * cifs_signal_cifsd_for_reconnect
217 *
218 * @server: the tcp ses for which reconnect is needed
219 * @server needs to be previously set to CifsNeedReconnect.
220 * @mark_smb_session: whether even sessions need to be marked
221 */
222void
223cifs_mark_tcp_ses_conns_for_reconnect(struct TCP_Server_Info *server,
224 bool mark_smb_session)
225{
226 struct TCP_Server_Info *pserver;
227 struct cifs_ses *ses, *nses;
228 struct cifs_tcon *tcon;
229
230 /*
231 * before reconnecting the tcp session, mark the smb session (uid) and the tid bad so they
232 * are not used until reconnected.
233 */
234 cifs_dbg(FYI, "%s: marking necessary sessions and tcons for reconnect\n", __func__);
235
236 /* If server is a channel, select the primary channel */
237 pserver = CIFS_SERVER_IS_CHAN(server) ? server->primary_server : server;
238
239
240 spin_lock(&cifs_tcp_ses_lock);
241 list_for_each_entry_safe(ses, nses, &pserver->smb_ses_list, smb_ses_list) {
242 /* check if iface is still active */
243 if (!cifs_chan_is_iface_active(ses, server))
244 cifs_chan_update_iface(ses, server);
245
246 spin_lock(&ses->chan_lock);
247 if (!mark_smb_session && cifs_chan_needs_reconnect(ses, server))
248 goto next_session;
249
250 if (mark_smb_session)
251 CIFS_SET_ALL_CHANS_NEED_RECONNECT(ses);
252 else
253 cifs_chan_set_need_reconnect(ses, server);
254
255 /* If all channels need reconnect, then tcon needs reconnect */
256 if (!mark_smb_session && !CIFS_ALL_CHANS_NEED_RECONNECT(ses))
257 goto next_session;
258
259 ses->ses_status = SES_NEED_RECON;
260
261 list_for_each_entry(tcon, &ses->tcon_list, tcon_list) {
262 tcon->need_reconnect = true;
263 tcon->status = TID_NEED_RECON;
264 }
265 if (ses->tcon_ipc) {
266 ses->tcon_ipc->need_reconnect = true;
267 ses->tcon_ipc->status = TID_NEED_RECON;
268 }
269
270next_session:
271 spin_unlock(&ses->chan_lock);
272 }
273 spin_unlock(&cifs_tcp_ses_lock);
274}
275
276static void
277cifs_abort_connection(struct TCP_Server_Info *server)
278{
279 struct mid_q_entry *mid, *nmid;
280 struct list_head retry_list;
281
282 server->maxBuf = 0;
283 server->max_read = 0;
284
285 /* do not want to be sending data on a socket we are freeing */
286 cifs_dbg(FYI, "%s: tearing down socket\n", __func__);
287 cifs_server_lock(server);
288 if (server->ssocket) {
289 cifs_dbg(FYI, "State: 0x%x Flags: 0x%lx\n", server->ssocket->state,
290 server->ssocket->flags);
291 kernel_sock_shutdown(server->ssocket, SHUT_WR);
292 cifs_dbg(FYI, "Post shutdown state: 0x%x Flags: 0x%lx\n", server->ssocket->state,
293 server->ssocket->flags);
294 sock_release(server->ssocket);
295 server->ssocket = NULL;
296 }
297 server->sequence_number = 0;
298 server->session_estab = false;
299 kfree_sensitive(server->session_key.response);
300 server->session_key.response = NULL;
301 server->session_key.len = 0;
302 server->lstrp = jiffies;
303
304 /* mark submitted MIDs for retry and issue callback */
305 INIT_LIST_HEAD(&retry_list);
306 cifs_dbg(FYI, "%s: moving mids to private list\n", __func__);
307 spin_lock(&server->mid_lock);
308 list_for_each_entry_safe(mid, nmid, &server->pending_mid_q, qhead) {
309 kref_get(&mid->refcount);
310 if (mid->mid_state == MID_REQUEST_SUBMITTED)
311 mid->mid_state = MID_RETRY_NEEDED;
312 list_move(&mid->qhead, &retry_list);
313 mid->mid_flags |= MID_DELETED;
314 }
315 spin_unlock(&server->mid_lock);
316 cifs_server_unlock(server);
317
318 cifs_dbg(FYI, "%s: issuing mid callbacks\n", __func__);
319 list_for_each_entry_safe(mid, nmid, &retry_list, qhead) {
320 list_del_init(&mid->qhead);
321 mid->callback(mid);
322 release_mid(mid);
323 }
324
325 if (cifs_rdma_enabled(server)) {
326 cifs_server_lock(server);
327 smbd_destroy(server);
328 cifs_server_unlock(server);
329 }
330}
331
332static bool cifs_tcp_ses_needs_reconnect(struct TCP_Server_Info *server, int num_targets)
333{
334 spin_lock(&server->srv_lock);
335 server->nr_targets = num_targets;
336 if (server->tcpStatus == CifsExiting) {
337 /* the demux thread will exit normally next time through the loop */
338 spin_unlock(&server->srv_lock);
339 wake_up(&server->response_q);
340 return false;
341 }
342
343 cifs_dbg(FYI, "Mark tcp session as need reconnect\n");
344 trace_smb3_reconnect(server->CurrentMid, server->conn_id,
345 server->hostname);
346 server->tcpStatus = CifsNeedReconnect;
347
348 spin_unlock(&server->srv_lock);
349 return true;
350}
351
352/*
353 * cifs tcp session reconnection
354 *
355 * mark tcp session as reconnecting so temporarily locked
356 * mark all smb sessions as reconnecting for tcp session
357 * reconnect tcp session
358 * wake up waiters on reconnection? - (not needed currently)
359 *
360 * if mark_smb_session is passed as true, unconditionally mark
361 * the smb session (and tcon) for reconnect as well. This value
362 * doesn't really matter for non-multichannel scenario.
363 *
364 */
365static int __cifs_reconnect(struct TCP_Server_Info *server,
366 bool mark_smb_session)
367{
368 int rc = 0;
369
370 if (!cifs_tcp_ses_needs_reconnect(server, 1))
371 return 0;
372
373 cifs_mark_tcp_ses_conns_for_reconnect(server, mark_smb_session);
374
375 cifs_abort_connection(server);
376
377 do {
378 try_to_freeze();
379 cifs_server_lock(server);
380
381 if (!cifs_swn_set_server_dstaddr(server)) {
382 /* resolve the hostname again to make sure that IP address is up-to-date */
383 rc = reconn_set_ipaddr_from_hostname(server);
384 cifs_dbg(FYI, "%s: reconn_set_ipaddr_from_hostname: rc=%d\n", __func__, rc);
385 }
386
387 if (cifs_rdma_enabled(server))
388 rc = smbd_reconnect(server);
389 else
390 rc = generic_ip_connect(server);
391 if (rc) {
392 cifs_server_unlock(server);
393 cifs_dbg(FYI, "%s: reconnect error %d\n", __func__, rc);
394 msleep(3000);
395 } else {
396 atomic_inc(&tcpSesReconnectCount);
397 set_credits(server, 1);
398 spin_lock(&server->srv_lock);
399 if (server->tcpStatus != CifsExiting)
400 server->tcpStatus = CifsNeedNegotiate;
401 spin_unlock(&server->srv_lock);
402 cifs_swn_reset_server_dstaddr(server);
403 cifs_server_unlock(server);
404 mod_delayed_work(cifsiod_wq, &server->reconnect, 0);
405 }
406 } while (server->tcpStatus == CifsNeedReconnect);
407
408 spin_lock(&server->srv_lock);
409 if (server->tcpStatus == CifsNeedNegotiate)
410 mod_delayed_work(cifsiod_wq, &server->echo, 0);
411 spin_unlock(&server->srv_lock);
412
413 wake_up(&server->response_q);
414 return rc;
415}
416
417#ifdef CONFIG_CIFS_DFS_UPCALL
418static int __reconnect_target_unlocked(struct TCP_Server_Info *server, const char *target)
419{
420 int rc;
421 char *hostname;
422
423 if (!cifs_swn_set_server_dstaddr(server)) {
424 if (server->hostname != target) {
425 hostname = extract_hostname(target);
426 if (!IS_ERR(hostname)) {
427 kfree(server->hostname);
428 server->hostname = hostname;
429 } else {
430 cifs_dbg(FYI, "%s: couldn't extract hostname or address from dfs target: %ld\n",
431 __func__, PTR_ERR(hostname));
432 cifs_dbg(FYI, "%s: default to last target server: %s\n", __func__,
433 server->hostname);
434 }
435 }
436 /* resolve the hostname again to make sure that IP address is up-to-date. */
437 rc = reconn_set_ipaddr_from_hostname(server);
438 cifs_dbg(FYI, "%s: reconn_set_ipaddr_from_hostname: rc=%d\n", __func__, rc);
439 }
440 /* Reconnect the socket */
441 if (cifs_rdma_enabled(server))
442 rc = smbd_reconnect(server);
443 else
444 rc = generic_ip_connect(server);
445
446 return rc;
447}
448
449static int reconnect_target_unlocked(struct TCP_Server_Info *server, struct dfs_cache_tgt_list *tl,
450 struct dfs_cache_tgt_iterator **target_hint)
451{
452 int rc;
453 struct dfs_cache_tgt_iterator *tit;
454
455 *target_hint = NULL;
456
457 /* If dfs target list is empty, then reconnect to last server */
458 tit = dfs_cache_get_tgt_iterator(tl);
459 if (!tit)
460 return __reconnect_target_unlocked(server, server->hostname);
461
462 /* Otherwise, try every dfs target in @tl */
463 for (; tit; tit = dfs_cache_get_next_tgt(tl, tit)) {
464 rc = __reconnect_target_unlocked(server, dfs_cache_get_tgt_name(tit));
465 if (!rc) {
466 *target_hint = tit;
467 break;
468 }
469 }
470 return rc;
471}
472
473static int reconnect_dfs_server(struct TCP_Server_Info *server)
474{
475 int rc = 0;
476 const char *refpath = server->current_fullpath + 1;
477 struct dfs_cache_tgt_list tl = DFS_CACHE_TGT_LIST_INIT(tl);
478 struct dfs_cache_tgt_iterator *target_hint = NULL;
479 int num_targets = 0;
480
481 /*
482 * Determine the number of dfs targets the referral path in @cifs_sb resolves to.
483 *
484 * smb2_reconnect() needs to know how long it should wait based upon the number of dfs
485 * targets (server->nr_targets). It's also possible that the cached referral was cleared
486 * through /proc/fs/cifs/dfscache or the target list is empty due to server settings after
487 * refreshing the referral, so, in this case, default it to 1.
488 */
489 if (!dfs_cache_noreq_find(refpath, NULL, &tl))
490 num_targets = dfs_cache_get_nr_tgts(&tl);
491 if (!num_targets)
492 num_targets = 1;
493
494 if (!cifs_tcp_ses_needs_reconnect(server, num_targets))
495 return 0;
496
497 /*
498 * Unconditionally mark all sessions & tcons for reconnect as we might be connecting to a
499 * different server or share during failover. It could be improved by adding some logic to
500 * only do that in case it connects to a different server or share, though.
501 */
502 cifs_mark_tcp_ses_conns_for_reconnect(server, true);
503
504 cifs_abort_connection(server);
505
506 do {
507 try_to_freeze();
508 cifs_server_lock(server);
509
510 rc = reconnect_target_unlocked(server, &tl, &target_hint);
511 if (rc) {
512 /* Failed to reconnect socket */
513 cifs_server_unlock(server);
514 cifs_dbg(FYI, "%s: reconnect error %d\n", __func__, rc);
515 msleep(3000);
516 continue;
517 }
518 /*
519 * Socket was created. Update tcp session status to CifsNeedNegotiate so that a
520 * process waiting for reconnect will know it needs to re-establish session and tcon
521 * through the reconnected target server.
522 */
523 atomic_inc(&tcpSesReconnectCount);
524 set_credits(server, 1);
525 spin_lock(&server->srv_lock);
526 if (server->tcpStatus != CifsExiting)
527 server->tcpStatus = CifsNeedNegotiate;
528 spin_unlock(&server->srv_lock);
529 cifs_swn_reset_server_dstaddr(server);
530 cifs_server_unlock(server);
531 mod_delayed_work(cifsiod_wq, &server->reconnect, 0);
532 } while (server->tcpStatus == CifsNeedReconnect);
533
534 dfs_cache_noreq_update_tgthint(refpath, target_hint);
535 dfs_cache_free_tgts(&tl);
536
537 /* Need to set up echo worker again once connection has been established */
538 spin_lock(&server->srv_lock);
539 if (server->tcpStatus == CifsNeedNegotiate)
540 mod_delayed_work(cifsiod_wq, &server->echo, 0);
541 spin_unlock(&server->srv_lock);
542
543 wake_up(&server->response_q);
544 return rc;
545}
546
547int cifs_reconnect(struct TCP_Server_Info *server, bool mark_smb_session)
548{
549 mutex_lock(&server->refpath_lock);
550 if (!server->leaf_fullpath) {
551 mutex_unlock(&server->refpath_lock);
552 return __cifs_reconnect(server, mark_smb_session);
553 }
554 mutex_unlock(&server->refpath_lock);
555
556 return reconnect_dfs_server(server);
557}
558#else
559int cifs_reconnect(struct TCP_Server_Info *server, bool mark_smb_session)
560{
561 return __cifs_reconnect(server, mark_smb_session);
562}
563#endif
564
565static void
566cifs_echo_request(struct work_struct *work)
567{
568 int rc;
569 struct TCP_Server_Info *server = container_of(work,
570 struct TCP_Server_Info, echo.work);
571
572 /*
573 * We cannot send an echo if it is disabled.
574 * Also, no need to ping if we got a response recently.
575 */
576
577 if (server->tcpStatus == CifsNeedReconnect ||
578 server->tcpStatus == CifsExiting ||
579 server->tcpStatus == CifsNew ||
580 (server->ops->can_echo && !server->ops->can_echo(server)) ||
581 time_before(jiffies, server->lstrp + server->echo_interval - HZ))
582 goto requeue_echo;
583
584 rc = server->ops->echo ? server->ops->echo(server) : -ENOSYS;
585 if (rc)
586 cifs_dbg(FYI, "Unable to send echo request to server: %s\n",
587 server->hostname);
588
589 /* Check witness registrations */
590 cifs_swn_check();
591
592requeue_echo:
593 queue_delayed_work(cifsiod_wq, &server->echo, server->echo_interval);
594}
595
596static bool
597allocate_buffers(struct TCP_Server_Info *server)
598{
599 if (!server->bigbuf) {
600 server->bigbuf = (char *)cifs_buf_get();
601 if (!server->bigbuf) {
602 cifs_server_dbg(VFS, "No memory for large SMB response\n");
603 msleep(3000);
604 /* retry will check if exiting */
605 return false;
606 }
607 } else if (server->large_buf) {
608 /* we are reusing a dirty large buf, clear its start */
609 memset(server->bigbuf, 0, HEADER_SIZE(server));
610 }
611
612 if (!server->smallbuf) {
613 server->smallbuf = (char *)cifs_small_buf_get();
614 if (!server->smallbuf) {
615 cifs_server_dbg(VFS, "No memory for SMB response\n");
616 msleep(1000);
617 /* retry will check if exiting */
618 return false;
619 }
620 /* beginning of smb buffer is cleared in our buf_get */
621 } else {
622 /* if existing small buf clear beginning */
623 memset(server->smallbuf, 0, HEADER_SIZE(server));
624 }
625
626 return true;
627}
628
629static bool
630server_unresponsive(struct TCP_Server_Info *server)
631{
632 /*
633 * We need to wait 3 echo intervals to make sure we handle such
634 * situations right:
635 * 1s client sends a normal SMB request
636 * 2s client gets a response
637 * 30s echo workqueue job pops, and decides we got a response recently
638 * and don't need to send another
639 * ...
640 * 65s kernel_recvmsg times out, and we see that we haven't gotten
641 * a response in >60s.
642 */
643 spin_lock(&server->srv_lock);
644 if ((server->tcpStatus == CifsGood ||
645 server->tcpStatus == CifsNeedNegotiate) &&
646 (!server->ops->can_echo || server->ops->can_echo(server)) &&
647 time_after(jiffies, server->lstrp + 3 * server->echo_interval)) {
648 spin_unlock(&server->srv_lock);
649 cifs_server_dbg(VFS, "has not responded in %lu seconds. Reconnecting...\n",
650 (3 * server->echo_interval) / HZ);
651 cifs_reconnect(server, false);
652 return true;
653 }
654 spin_unlock(&server->srv_lock);
655
656 return false;
657}
658
659static inline bool
660zero_credits(struct TCP_Server_Info *server)
661{
662 int val;
663
664 spin_lock(&server->req_lock);
665 val = server->credits + server->echo_credits + server->oplock_credits;
666 if (server->in_flight == 0 && val == 0) {
667 spin_unlock(&server->req_lock);
668 return true;
669 }
670 spin_unlock(&server->req_lock);
671 return false;
672}
673
674static int
675cifs_readv_from_socket(struct TCP_Server_Info *server, struct msghdr *smb_msg)
676{
677 int length = 0;
678 int total_read;
679
680 for (total_read = 0; msg_data_left(smb_msg); total_read += length) {
681 try_to_freeze();
682
683 /* reconnect if no credits and no requests in flight */
684 if (zero_credits(server)) {
685 cifs_reconnect(server, false);
686 return -ECONNABORTED;
687 }
688
689 if (server_unresponsive(server))
690 return -ECONNABORTED;
691 if (cifs_rdma_enabled(server) && server->smbd_conn)
692 length = smbd_recv(server->smbd_conn, smb_msg);
693 else
694 length = sock_recvmsg(server->ssocket, smb_msg, 0);
695
696 spin_lock(&server->srv_lock);
697 if (server->tcpStatus == CifsExiting) {
698 spin_unlock(&server->srv_lock);
699 return -ESHUTDOWN;
700 }
701
702 if (server->tcpStatus == CifsNeedReconnect) {
703 spin_unlock(&server->srv_lock);
704 cifs_reconnect(server, false);
705 return -ECONNABORTED;
706 }
707 spin_unlock(&server->srv_lock);
708
709 if (length == -ERESTARTSYS ||
710 length == -EAGAIN ||
711 length == -EINTR) {
712 /*
713 * Minimum sleep to prevent looping, allowing socket
714 * to clear and app threads to set tcpStatus
715 * CifsNeedReconnect if server hung.
716 */
717 usleep_range(1000, 2000);
718 length = 0;
719 continue;
720 }
721
722 if (length <= 0) {
723 cifs_dbg(FYI, "Received no data or error: %d\n", length);
724 cifs_reconnect(server, false);
725 return -ECONNABORTED;
726 }
727 }
728 return total_read;
729}
730
731int
732cifs_read_from_socket(struct TCP_Server_Info *server, char *buf,
733 unsigned int to_read)
734{
735 struct msghdr smb_msg = {};
736 struct kvec iov = {.iov_base = buf, .iov_len = to_read};
737 iov_iter_kvec(&smb_msg.msg_iter, ITER_DEST, &iov, 1, to_read);
738
739 return cifs_readv_from_socket(server, &smb_msg);
740}
741
742ssize_t
743cifs_discard_from_socket(struct TCP_Server_Info *server, size_t to_read)
744{
745 struct msghdr smb_msg = {};
746
747 /*
748 * iov_iter_discard already sets smb_msg.type and count and iov_offset
749 * and cifs_readv_from_socket sets msg_control and msg_controllen
750 * so little to initialize in struct msghdr
751 */
752 iov_iter_discard(&smb_msg.msg_iter, ITER_DEST, to_read);
753
754 return cifs_readv_from_socket(server, &smb_msg);
755}
756
757int
758cifs_read_page_from_socket(struct TCP_Server_Info *server, struct page *page,
759 unsigned int page_offset, unsigned int to_read)
760{
761 struct msghdr smb_msg = {};
762 struct bio_vec bv = {
763 .bv_page = page, .bv_len = to_read, .bv_offset = page_offset};
764 iov_iter_bvec(&smb_msg.msg_iter, ITER_DEST, &bv, 1, to_read);
765 return cifs_readv_from_socket(server, &smb_msg);
766}
767
768static bool
769is_smb_response(struct TCP_Server_Info *server, unsigned char type)
770{
771 /*
772 * The first byte big endian of the length field,
773 * is actually not part of the length but the type
774 * with the most common, zero, as regular data.
775 */
776 switch (type) {
777 case RFC1002_SESSION_MESSAGE:
778 /* Regular SMB response */
779 return true;
780 case RFC1002_SESSION_KEEP_ALIVE:
781 cifs_dbg(FYI, "RFC 1002 session keep alive\n");
782 break;
783 case RFC1002_POSITIVE_SESSION_RESPONSE:
784 cifs_dbg(FYI, "RFC 1002 positive session response\n");
785 break;
786 case RFC1002_NEGATIVE_SESSION_RESPONSE:
787 /*
788 * We get this from Windows 98 instead of an error on
789 * SMB negprot response.
790 */
791 cifs_dbg(FYI, "RFC 1002 negative session response\n");
792 /* give server a second to clean up */
793 msleep(1000);
794 /*
795 * Always try 445 first on reconnect since we get NACK
796 * on some if we ever connected to port 139 (the NACK
797 * is since we do not begin with RFC1001 session
798 * initialize frame).
799 */
800 cifs_set_port((struct sockaddr *)&server->dstaddr, CIFS_PORT);
801 cifs_reconnect(server, true);
802 break;
803 default:
804 cifs_server_dbg(VFS, "RFC 1002 unknown response type 0x%x\n", type);
805 cifs_reconnect(server, true);
806 }
807
808 return false;
809}
810
811void
812dequeue_mid(struct mid_q_entry *mid, bool malformed)
813{
814#ifdef CONFIG_CIFS_STATS2
815 mid->when_received = jiffies;
816#endif
817 spin_lock(&mid->server->mid_lock);
818 if (!malformed)
819 mid->mid_state = MID_RESPONSE_RECEIVED;
820 else
821 mid->mid_state = MID_RESPONSE_MALFORMED;
822 /*
823 * Trying to handle/dequeue a mid after the send_recv()
824 * function has finished processing it is a bug.
825 */
826 if (mid->mid_flags & MID_DELETED) {
827 spin_unlock(&mid->server->mid_lock);
828 pr_warn_once("trying to dequeue a deleted mid\n");
829 } else {
830 list_del_init(&mid->qhead);
831 mid->mid_flags |= MID_DELETED;
832 spin_unlock(&mid->server->mid_lock);
833 }
834}
835
836static unsigned int
837smb2_get_credits_from_hdr(char *buffer, struct TCP_Server_Info *server)
838{
839 struct smb2_hdr *shdr = (struct smb2_hdr *)buffer;
840
841 /*
842 * SMB1 does not use credits.
843 */
844 if (is_smb1(server))
845 return 0;
846
847 return le16_to_cpu(shdr->CreditRequest);
848}
849
850static void
851handle_mid(struct mid_q_entry *mid, struct TCP_Server_Info *server,
852 char *buf, int malformed)
853{
854 if (server->ops->check_trans2 &&
855 server->ops->check_trans2(mid, server, buf, malformed))
856 return;
857 mid->credits_received = smb2_get_credits_from_hdr(buf, server);
858 mid->resp_buf = buf;
859 mid->large_buf = server->large_buf;
860 /* Was previous buf put in mpx struct for multi-rsp? */
861 if (!mid->multiRsp) {
862 /* smb buffer will be freed by user thread */
863 if (server->large_buf)
864 server->bigbuf = NULL;
865 else
866 server->smallbuf = NULL;
867 }
868 dequeue_mid(mid, malformed);
869}
870
871int
872cifs_enable_signing(struct TCP_Server_Info *server, bool mnt_sign_required)
873{
874 bool srv_sign_required = server->sec_mode & server->vals->signing_required;
875 bool srv_sign_enabled = server->sec_mode & server->vals->signing_enabled;
876 bool mnt_sign_enabled;
877
878 /*
879 * Is signing required by mnt options? If not then check
880 * global_secflags to see if it is there.
881 */
882 if (!mnt_sign_required)
883 mnt_sign_required = ((global_secflags & CIFSSEC_MUST_SIGN) ==
884 CIFSSEC_MUST_SIGN);
885
886 /*
887 * If signing is required then it's automatically enabled too,
888 * otherwise, check to see if the secflags allow it.
889 */
890 mnt_sign_enabled = mnt_sign_required ? mnt_sign_required :
891 (global_secflags & CIFSSEC_MAY_SIGN);
892
893 /* If server requires signing, does client allow it? */
894 if (srv_sign_required) {
895 if (!mnt_sign_enabled) {
896 cifs_dbg(VFS, "Server requires signing, but it's disabled in SecurityFlags!\n");
897 return -EOPNOTSUPP;
898 }
899 server->sign = true;
900 }
901
902 /* If client requires signing, does server allow it? */
903 if (mnt_sign_required) {
904 if (!srv_sign_enabled) {
905 cifs_dbg(VFS, "Server does not support signing!\n");
906 return -EOPNOTSUPP;
907 }
908 server->sign = true;
909 }
910
911 if (cifs_rdma_enabled(server) && server->sign)
912 cifs_dbg(VFS, "Signing is enabled, and RDMA read/write will be disabled\n");
913
914 return 0;
915}
916
917
918static void clean_demultiplex_info(struct TCP_Server_Info *server)
919{
920 int length;
921
922 /* take it off the list, if it's not already */
923 spin_lock(&server->srv_lock);
924 list_del_init(&server->tcp_ses_list);
925 spin_unlock(&server->srv_lock);
926
927 cancel_delayed_work_sync(&server->echo);
928 cancel_delayed_work_sync(&server->resolve);
929
930 spin_lock(&server->srv_lock);
931 server->tcpStatus = CifsExiting;
932 spin_unlock(&server->srv_lock);
933 wake_up_all(&server->response_q);
934
935 /* check if we have blocked requests that need to free */
936 spin_lock(&server->req_lock);
937 if (server->credits <= 0)
938 server->credits = 1;
939 spin_unlock(&server->req_lock);
940 /*
941 * Although there should not be any requests blocked on this queue it
942 * can not hurt to be paranoid and try to wake up requests that may
943 * haven been blocked when more than 50 at time were on the wire to the
944 * same server - they now will see the session is in exit state and get
945 * out of SendReceive.
946 */
947 wake_up_all(&server->request_q);
948 /* give those requests time to exit */
949 msleep(125);
950 if (cifs_rdma_enabled(server))
951 smbd_destroy(server);
952 if (server->ssocket) {
953 sock_release(server->ssocket);
954 server->ssocket = NULL;
955 }
956
957 if (!list_empty(&server->pending_mid_q)) {
958 struct list_head dispose_list;
959 struct mid_q_entry *mid_entry;
960 struct list_head *tmp, *tmp2;
961
962 INIT_LIST_HEAD(&dispose_list);
963 spin_lock(&server->mid_lock);
964 list_for_each_safe(tmp, tmp2, &server->pending_mid_q) {
965 mid_entry = list_entry(tmp, struct mid_q_entry, qhead);
966 cifs_dbg(FYI, "Clearing mid %llu\n", mid_entry->mid);
967 kref_get(&mid_entry->refcount);
968 mid_entry->mid_state = MID_SHUTDOWN;
969 list_move(&mid_entry->qhead, &dispose_list);
970 mid_entry->mid_flags |= MID_DELETED;
971 }
972 spin_unlock(&server->mid_lock);
973
974 /* now walk dispose list and issue callbacks */
975 list_for_each_safe(tmp, tmp2, &dispose_list) {
976 mid_entry = list_entry(tmp, struct mid_q_entry, qhead);
977 cifs_dbg(FYI, "Callback mid %llu\n", mid_entry->mid);
978 list_del_init(&mid_entry->qhead);
979 mid_entry->callback(mid_entry);
980 release_mid(mid_entry);
981 }
982 /* 1/8th of sec is more than enough time for them to exit */
983 msleep(125);
984 }
985
986 if (!list_empty(&server->pending_mid_q)) {
987 /*
988 * mpx threads have not exited yet give them at least the smb
989 * send timeout time for long ops.
990 *
991 * Due to delays on oplock break requests, we need to wait at
992 * least 45 seconds before giving up on a request getting a
993 * response and going ahead and killing cifsd.
994 */
995 cifs_dbg(FYI, "Wait for exit from demultiplex thread\n");
996 msleep(46000);
997 /*
998 * If threads still have not exited they are probably never
999 * coming home not much else we can do but free the memory.
1000 */
1001 }
1002
1003#ifdef CONFIG_CIFS_DFS_UPCALL
1004 kfree(server->origin_fullpath);
1005 kfree(server->leaf_fullpath);
1006#endif
1007 kfree(server);
1008
1009 length = atomic_dec_return(&tcpSesAllocCount);
1010 if (length > 0)
1011 mempool_resize(cifs_req_poolp, length + cifs_min_rcv);
1012}
1013
1014static int
1015standard_receive3(struct TCP_Server_Info *server, struct mid_q_entry *mid)
1016{
1017 int length;
1018 char *buf = server->smallbuf;
1019 unsigned int pdu_length = server->pdu_size;
1020
1021 /* make sure this will fit in a large buffer */
1022 if (pdu_length > CIFSMaxBufSize + MAX_HEADER_SIZE(server) -
1023 HEADER_PREAMBLE_SIZE(server)) {
1024 cifs_server_dbg(VFS, "SMB response too long (%u bytes)\n", pdu_length);
1025 cifs_reconnect(server, true);
1026 return -ECONNABORTED;
1027 }
1028
1029 /* switch to large buffer if too big for a small one */
1030 if (pdu_length > MAX_CIFS_SMALL_BUFFER_SIZE - 4) {
1031 server->large_buf = true;
1032 memcpy(server->bigbuf, buf, server->total_read);
1033 buf = server->bigbuf;
1034 }
1035
1036 /* now read the rest */
1037 length = cifs_read_from_socket(server, buf + HEADER_SIZE(server) - 1,
1038 pdu_length - MID_HEADER_SIZE(server));
1039
1040 if (length < 0)
1041 return length;
1042 server->total_read += length;
1043
1044 dump_smb(buf, server->total_read);
1045
1046 return cifs_handle_standard(server, mid);
1047}
1048
1049int
1050cifs_handle_standard(struct TCP_Server_Info *server, struct mid_q_entry *mid)
1051{
1052 char *buf = server->large_buf ? server->bigbuf : server->smallbuf;
1053 int rc;
1054
1055 /*
1056 * We know that we received enough to get to the MID as we
1057 * checked the pdu_length earlier. Now check to see
1058 * if the rest of the header is OK.
1059 *
1060 * 48 bytes is enough to display the header and a little bit
1061 * into the payload for debugging purposes.
1062 */
1063 rc = server->ops->check_message(buf, server->total_read, server);
1064 if (rc)
1065 cifs_dump_mem("Bad SMB: ", buf,
1066 min_t(unsigned int, server->total_read, 48));
1067
1068 if (server->ops->is_session_expired &&
1069 server->ops->is_session_expired(buf)) {
1070 cifs_reconnect(server, true);
1071 return -1;
1072 }
1073
1074 if (server->ops->is_status_pending &&
1075 server->ops->is_status_pending(buf, server))
1076 return -1;
1077
1078 if (!mid)
1079 return rc;
1080
1081 handle_mid(mid, server, buf, rc);
1082 return 0;
1083}
1084
1085static void
1086smb2_add_credits_from_hdr(char *buffer, struct TCP_Server_Info *server)
1087{
1088 struct smb2_hdr *shdr = (struct smb2_hdr *)buffer;
1089 int scredits, in_flight;
1090
1091 /*
1092 * SMB1 does not use credits.
1093 */
1094 if (is_smb1(server))
1095 return;
1096
1097 if (shdr->CreditRequest) {
1098 spin_lock(&server->req_lock);
1099 server->credits += le16_to_cpu(shdr->CreditRequest);
1100 scredits = server->credits;
1101 in_flight = server->in_flight;
1102 spin_unlock(&server->req_lock);
1103 wake_up(&server->request_q);
1104
1105 trace_smb3_hdr_credits(server->CurrentMid,
1106 server->conn_id, server->hostname, scredits,
1107 le16_to_cpu(shdr->CreditRequest), in_flight);
1108 cifs_server_dbg(FYI, "%s: added %u credits total=%d\n",
1109 __func__, le16_to_cpu(shdr->CreditRequest),
1110 scredits);
1111 }
1112}
1113
1114
1115static int
1116cifs_demultiplex_thread(void *p)
1117{
1118 int i, num_mids, length;
1119 struct TCP_Server_Info *server = p;
1120 unsigned int pdu_length;
1121 unsigned int next_offset;
1122 char *buf = NULL;
1123 struct task_struct *task_to_wake = NULL;
1124 struct mid_q_entry *mids[MAX_COMPOUND];
1125 char *bufs[MAX_COMPOUND];
1126 unsigned int noreclaim_flag, num_io_timeout = 0;
1127
1128 noreclaim_flag = memalloc_noreclaim_save();
1129 cifs_dbg(FYI, "Demultiplex PID: %d\n", task_pid_nr(current));
1130
1131 length = atomic_inc_return(&tcpSesAllocCount);
1132 if (length > 1)
1133 mempool_resize(cifs_req_poolp, length + cifs_min_rcv);
1134
1135 set_freezable();
1136 allow_kernel_signal(SIGKILL);
1137 while (server->tcpStatus != CifsExiting) {
1138 if (try_to_freeze())
1139 continue;
1140
1141 if (!allocate_buffers(server))
1142 continue;
1143
1144 server->large_buf = false;
1145 buf = server->smallbuf;
1146 pdu_length = 4; /* enough to get RFC1001 header */
1147
1148 length = cifs_read_from_socket(server, buf, pdu_length);
1149 if (length < 0)
1150 continue;
1151
1152 if (is_smb1(server))
1153 server->total_read = length;
1154 else
1155 server->total_read = 0;
1156
1157 /*
1158 * The right amount was read from socket - 4 bytes,
1159 * so we can now interpret the length field.
1160 */
1161 pdu_length = get_rfc1002_length(buf);
1162
1163 cifs_dbg(FYI, "RFC1002 header 0x%x\n", pdu_length);
1164 if (!is_smb_response(server, buf[0]))
1165 continue;
1166next_pdu:
1167 server->pdu_size = pdu_length;
1168
1169 /* make sure we have enough to get to the MID */
1170 if (server->pdu_size < MID_HEADER_SIZE(server)) {
1171 cifs_server_dbg(VFS, "SMB response too short (%u bytes)\n",
1172 server->pdu_size);
1173 cifs_reconnect(server, true);
1174 continue;
1175 }
1176
1177 /* read down to the MID */
1178 length = cifs_read_from_socket(server,
1179 buf + HEADER_PREAMBLE_SIZE(server),
1180 MID_HEADER_SIZE(server));
1181 if (length < 0)
1182 continue;
1183 server->total_read += length;
1184
1185 if (server->ops->next_header) {
1186 next_offset = server->ops->next_header(buf);
1187 if (next_offset)
1188 server->pdu_size = next_offset;
1189 }
1190
1191 memset(mids, 0, sizeof(mids));
1192 memset(bufs, 0, sizeof(bufs));
1193 num_mids = 0;
1194
1195 if (server->ops->is_transform_hdr &&
1196 server->ops->receive_transform &&
1197 server->ops->is_transform_hdr(buf)) {
1198 length = server->ops->receive_transform(server,
1199 mids,
1200 bufs,
1201 &num_mids);
1202 } else {
1203 mids[0] = server->ops->find_mid(server, buf);
1204 bufs[0] = buf;
1205 num_mids = 1;
1206
1207 if (!mids[0] || !mids[0]->receive)
1208 length = standard_receive3(server, mids[0]);
1209 else
1210 length = mids[0]->receive(server, mids[0]);
1211 }
1212
1213 if (length < 0) {
1214 for (i = 0; i < num_mids; i++)
1215 if (mids[i])
1216 release_mid(mids[i]);
1217 continue;
1218 }
1219
1220 if (server->ops->is_status_io_timeout &&
1221 server->ops->is_status_io_timeout(buf)) {
1222 num_io_timeout++;
1223 if (num_io_timeout > NUM_STATUS_IO_TIMEOUT) {
1224 cifs_reconnect(server, false);
1225 num_io_timeout = 0;
1226 continue;
1227 }
1228 }
1229
1230 server->lstrp = jiffies;
1231
1232 for (i = 0; i < num_mids; i++) {
1233 if (mids[i] != NULL) {
1234 mids[i]->resp_buf_size = server->pdu_size;
1235
1236 if (bufs[i] && server->ops->is_network_name_deleted)
1237 server->ops->is_network_name_deleted(bufs[i],
1238 server);
1239
1240 if (!mids[i]->multiRsp || mids[i]->multiEnd)
1241 mids[i]->callback(mids[i]);
1242
1243 release_mid(mids[i]);
1244 } else if (server->ops->is_oplock_break &&
1245 server->ops->is_oplock_break(bufs[i],
1246 server)) {
1247 smb2_add_credits_from_hdr(bufs[i], server);
1248 cifs_dbg(FYI, "Received oplock break\n");
1249 } else {
1250 cifs_server_dbg(VFS, "No task to wake, unknown frame received! NumMids %d\n",
1251 atomic_read(&mid_count));
1252 cifs_dump_mem("Received Data is: ", bufs[i],
1253 HEADER_SIZE(server));
1254 smb2_add_credits_from_hdr(bufs[i], server);
1255#ifdef CONFIG_CIFS_DEBUG2
1256 if (server->ops->dump_detail)
1257 server->ops->dump_detail(bufs[i],
1258 server);
1259 cifs_dump_mids(server);
1260#endif /* CIFS_DEBUG2 */
1261 }
1262 }
1263
1264 if (pdu_length > server->pdu_size) {
1265 if (!allocate_buffers(server))
1266 continue;
1267 pdu_length -= server->pdu_size;
1268 server->total_read = 0;
1269 server->large_buf = false;
1270 buf = server->smallbuf;
1271 goto next_pdu;
1272 }
1273 } /* end while !EXITING */
1274
1275 /* buffer usually freed in free_mid - need to free it here on exit */
1276 cifs_buf_release(server->bigbuf);
1277 if (server->smallbuf) /* no sense logging a debug message if NULL */
1278 cifs_small_buf_release(server->smallbuf);
1279
1280 task_to_wake = xchg(&server->tsk, NULL);
1281 clean_demultiplex_info(server);
1282
1283 /* if server->tsk was NULL then wait for a signal before exiting */
1284 if (!task_to_wake) {
1285 set_current_state(TASK_INTERRUPTIBLE);
1286 while (!signal_pending(current)) {
1287 schedule();
1288 set_current_state(TASK_INTERRUPTIBLE);
1289 }
1290 set_current_state(TASK_RUNNING);
1291 }
1292
1293 memalloc_noreclaim_restore(noreclaim_flag);
1294 module_put_and_kthread_exit(0);
1295}
1296
1297/*
1298 * Returns true if srcaddr isn't specified and rhs isn't specified, or
1299 * if srcaddr is specified and matches the IP address of the rhs argument
1300 */
1301bool
1302cifs_match_ipaddr(struct sockaddr *srcaddr, struct sockaddr *rhs)
1303{
1304 switch (srcaddr->sa_family) {
1305 case AF_UNSPEC:
1306 return (rhs->sa_family == AF_UNSPEC);
1307 case AF_INET: {
1308 struct sockaddr_in *saddr4 = (struct sockaddr_in *)srcaddr;
1309 struct sockaddr_in *vaddr4 = (struct sockaddr_in *)rhs;
1310 return (saddr4->sin_addr.s_addr == vaddr4->sin_addr.s_addr);
1311 }
1312 case AF_INET6: {
1313 struct sockaddr_in6 *saddr6 = (struct sockaddr_in6 *)srcaddr;
1314 struct sockaddr_in6 *vaddr6 = (struct sockaddr_in6 *)rhs;
1315 return ipv6_addr_equal(&saddr6->sin6_addr, &vaddr6->sin6_addr);
1316 }
1317 default:
1318 WARN_ON(1);
1319 return false; /* don't expect to be here */
1320 }
1321}
1322
1323/*
1324 * If no port is specified in addr structure, we try to match with 445 port
1325 * and if it fails - with 139 ports. It should be called only if address
1326 * families of server and addr are equal.
1327 */
1328static bool
1329match_port(struct TCP_Server_Info *server, struct sockaddr *addr)
1330{
1331 __be16 port, *sport;
1332
1333 /* SMBDirect manages its own ports, don't match it here */
1334 if (server->rdma)
1335 return true;
1336
1337 switch (addr->sa_family) {
1338 case AF_INET:
1339 sport = &((struct sockaddr_in *) &server->dstaddr)->sin_port;
1340 port = ((struct sockaddr_in *) addr)->sin_port;
1341 break;
1342 case AF_INET6:
1343 sport = &((struct sockaddr_in6 *) &server->dstaddr)->sin6_port;
1344 port = ((struct sockaddr_in6 *) addr)->sin6_port;
1345 break;
1346 default:
1347 WARN_ON(1);
1348 return false;
1349 }
1350
1351 if (!port) {
1352 port = htons(CIFS_PORT);
1353 if (port == *sport)
1354 return true;
1355
1356 port = htons(RFC1001_PORT);
1357 }
1358
1359 return port == *sport;
1360}
1361
1362static bool match_server_address(struct TCP_Server_Info *server, struct sockaddr *addr)
1363{
1364 switch (addr->sa_family) {
1365 case AF_INET: {
1366 struct sockaddr_in *addr4 = (struct sockaddr_in *)addr;
1367 struct sockaddr_in *srv_addr4 =
1368 (struct sockaddr_in *)&server->dstaddr;
1369
1370 if (addr4->sin_addr.s_addr != srv_addr4->sin_addr.s_addr)
1371 return false;
1372 break;
1373 }
1374 case AF_INET6: {
1375 struct sockaddr_in6 *addr6 = (struct sockaddr_in6 *)addr;
1376 struct sockaddr_in6 *srv_addr6 =
1377 (struct sockaddr_in6 *)&server->dstaddr;
1378
1379 if (!ipv6_addr_equal(&addr6->sin6_addr,
1380 &srv_addr6->sin6_addr))
1381 return false;
1382 if (addr6->sin6_scope_id != srv_addr6->sin6_scope_id)
1383 return false;
1384 break;
1385 }
1386 default:
1387 WARN_ON(1);
1388 return false; /* don't expect to be here */
1389 }
1390
1391 return true;
1392}
1393
1394static bool
1395match_security(struct TCP_Server_Info *server, struct smb3_fs_context *ctx)
1396{
1397 /*
1398 * The select_sectype function should either return the ctx->sectype
1399 * that was specified, or "Unspecified" if that sectype was not
1400 * compatible with the given NEGOTIATE request.
1401 */
1402 if (server->ops->select_sectype(server, ctx->sectype)
1403 == Unspecified)
1404 return false;
1405
1406 /*
1407 * Now check if signing mode is acceptable. No need to check
1408 * global_secflags at this point since if MUST_SIGN is set then
1409 * the server->sign had better be too.
1410 */
1411 if (ctx->sign && !server->sign)
1412 return false;
1413
1414 return true;
1415}
1416
1417static bool dfs_src_pathname_equal(const char *s1, const char *s2)
1418{
1419 if (strlen(s1) != strlen(s2))
1420 return false;
1421 for (; *s1; s1++, s2++) {
1422 if (*s1 == '/' || *s1 == '\\') {
1423 if (*s2 != '/' && *s2 != '\\')
1424 return false;
1425 } else if (tolower(*s1) != tolower(*s2))
1426 return false;
1427 }
1428 return true;
1429}
1430
1431/* this function must be called with srv_lock held */
1432static int match_server(struct TCP_Server_Info *server, struct smb3_fs_context *ctx,
1433 bool dfs_super_cmp)
1434{
1435 struct sockaddr *addr = (struct sockaddr *)&ctx->dstaddr;
1436
1437 if (ctx->nosharesock)
1438 return 0;
1439
1440 /* this server does not share socket */
1441 if (server->nosharesock)
1442 return 0;
1443
1444 /* If multidialect negotiation see if existing sessions match one */
1445 if (strcmp(ctx->vals->version_string, SMB3ANY_VERSION_STRING) == 0) {
1446 if (server->vals->protocol_id < SMB30_PROT_ID)
1447 return 0;
1448 } else if (strcmp(ctx->vals->version_string,
1449 SMBDEFAULT_VERSION_STRING) == 0) {
1450 if (server->vals->protocol_id < SMB21_PROT_ID)
1451 return 0;
1452 } else if ((server->vals != ctx->vals) || (server->ops != ctx->ops))
1453 return 0;
1454
1455 if (!net_eq(cifs_net_ns(server), current->nsproxy->net_ns))
1456 return 0;
1457
1458 if (!cifs_match_ipaddr((struct sockaddr *)&ctx->srcaddr,
1459 (struct sockaddr *)&server->srcaddr))
1460 return 0;
1461 /*
1462 * When matching DFS superblocks, we only check for original source pathname as the
1463 * currently connected target might be different than the one parsed earlier in i.e.
1464 * mount.cifs(8).
1465 */
1466 if (dfs_super_cmp) {
1467 if (!ctx->source || !server->origin_fullpath ||
1468 !dfs_src_pathname_equal(server->origin_fullpath, ctx->source))
1469 return 0;
1470 } else {
1471 /* Skip addr, hostname and port matching for DFS connections */
1472 if (server->leaf_fullpath) {
1473 if (!ctx->leaf_fullpath ||
1474 strcasecmp(server->leaf_fullpath, ctx->leaf_fullpath))
1475 return 0;
1476 } else if (strcasecmp(server->hostname, ctx->server_hostname) ||
1477 !match_server_address(server, addr) ||
1478 !match_port(server, addr)) {
1479 return 0;
1480 }
1481 }
1482
1483 if (!match_security(server, ctx))
1484 return 0;
1485
1486 if (server->echo_interval != ctx->echo_interval * HZ)
1487 return 0;
1488
1489 if (server->rdma != ctx->rdma)
1490 return 0;
1491
1492 if (server->ignore_signature != ctx->ignore_signature)
1493 return 0;
1494
1495 if (server->min_offload != ctx->min_offload)
1496 return 0;
1497
1498 return 1;
1499}
1500
1501struct TCP_Server_Info *
1502cifs_find_tcp_session(struct smb3_fs_context *ctx)
1503{
1504 struct TCP_Server_Info *server;
1505
1506 spin_lock(&cifs_tcp_ses_lock);
1507 list_for_each_entry(server, &cifs_tcp_ses_list, tcp_ses_list) {
1508 spin_lock(&server->srv_lock);
1509 /*
1510 * Skip ses channels since they're only handled in lower layers
1511 * (e.g. cifs_send_recv).
1512 */
1513 if (CIFS_SERVER_IS_CHAN(server) || !match_server(server, ctx, false)) {
1514 spin_unlock(&server->srv_lock);
1515 continue;
1516 }
1517 spin_unlock(&server->srv_lock);
1518
1519 ++server->srv_count;
1520 spin_unlock(&cifs_tcp_ses_lock);
1521 cifs_dbg(FYI, "Existing tcp session with server found\n");
1522 return server;
1523 }
1524 spin_unlock(&cifs_tcp_ses_lock);
1525 return NULL;
1526}
1527
1528void
1529cifs_put_tcp_session(struct TCP_Server_Info *server, int from_reconnect)
1530{
1531 struct task_struct *task;
1532
1533 spin_lock(&cifs_tcp_ses_lock);
1534 if (--server->srv_count > 0) {
1535 spin_unlock(&cifs_tcp_ses_lock);
1536 return;
1537 }
1538
1539 /* srv_count can never go negative */
1540 WARN_ON(server->srv_count < 0);
1541
1542 put_net(cifs_net_ns(server));
1543
1544 list_del_init(&server->tcp_ses_list);
1545 spin_unlock(&cifs_tcp_ses_lock);
1546
1547 /* For secondary channels, we pick up ref-count on the primary server */
1548 if (CIFS_SERVER_IS_CHAN(server))
1549 cifs_put_tcp_session(server->primary_server, from_reconnect);
1550
1551 cancel_delayed_work_sync(&server->echo);
1552 cancel_delayed_work_sync(&server->resolve);
1553
1554 if (from_reconnect)
1555 /*
1556 * Avoid deadlock here: reconnect work calls
1557 * cifs_put_tcp_session() at its end. Need to be sure
1558 * that reconnect work does nothing with server pointer after
1559 * that step.
1560 */
1561 cancel_delayed_work(&server->reconnect);
1562 else
1563 cancel_delayed_work_sync(&server->reconnect);
1564
1565 spin_lock(&server->srv_lock);
1566 server->tcpStatus = CifsExiting;
1567 spin_unlock(&server->srv_lock);
1568
1569 cifs_crypto_secmech_release(server);
1570
1571 kfree_sensitive(server->session_key.response);
1572 server->session_key.response = NULL;
1573 server->session_key.len = 0;
1574 kfree(server->hostname);
1575 server->hostname = NULL;
1576
1577 task = xchg(&server->tsk, NULL);
1578 if (task)
1579 send_sig(SIGKILL, task, 1);
1580}
1581
1582struct TCP_Server_Info *
1583cifs_get_tcp_session(struct smb3_fs_context *ctx,
1584 struct TCP_Server_Info *primary_server)
1585{
1586 struct TCP_Server_Info *tcp_ses = NULL;
1587 int rc;
1588
1589 cifs_dbg(FYI, "UNC: %s\n", ctx->UNC);
1590
1591 /* see if we already have a matching tcp_ses */
1592 tcp_ses = cifs_find_tcp_session(ctx);
1593 if (tcp_ses)
1594 return tcp_ses;
1595
1596 tcp_ses = kzalloc(sizeof(struct TCP_Server_Info), GFP_KERNEL);
1597 if (!tcp_ses) {
1598 rc = -ENOMEM;
1599 goto out_err;
1600 }
1601
1602 tcp_ses->hostname = kstrdup(ctx->server_hostname, GFP_KERNEL);
1603 if (!tcp_ses->hostname) {
1604 rc = -ENOMEM;
1605 goto out_err;
1606 }
1607
1608 if (ctx->leaf_fullpath) {
1609 tcp_ses->leaf_fullpath = kstrdup(ctx->leaf_fullpath, GFP_KERNEL);
1610 if (!tcp_ses->leaf_fullpath) {
1611 rc = -ENOMEM;
1612 goto out_err;
1613 }
1614 tcp_ses->current_fullpath = tcp_ses->leaf_fullpath;
1615 }
1616
1617 if (ctx->nosharesock)
1618 tcp_ses->nosharesock = true;
1619
1620 tcp_ses->ops = ctx->ops;
1621 tcp_ses->vals = ctx->vals;
1622 cifs_set_net_ns(tcp_ses, get_net(current->nsproxy->net_ns));
1623
1624 tcp_ses->conn_id = atomic_inc_return(&tcpSesNextId);
1625 tcp_ses->noblockcnt = ctx->rootfs;
1626 tcp_ses->noblocksnd = ctx->noblocksnd || ctx->rootfs;
1627 tcp_ses->noautotune = ctx->noautotune;
1628 tcp_ses->tcp_nodelay = ctx->sockopt_tcp_nodelay;
1629 tcp_ses->rdma = ctx->rdma;
1630 tcp_ses->in_flight = 0;
1631 tcp_ses->max_in_flight = 0;
1632 tcp_ses->credits = 1;
1633 if (primary_server) {
1634 spin_lock(&cifs_tcp_ses_lock);
1635 ++primary_server->srv_count;
1636 spin_unlock(&cifs_tcp_ses_lock);
1637 tcp_ses->primary_server = primary_server;
1638 }
1639 init_waitqueue_head(&tcp_ses->response_q);
1640 init_waitqueue_head(&tcp_ses->request_q);
1641 INIT_LIST_HEAD(&tcp_ses->pending_mid_q);
1642 mutex_init(&tcp_ses->_srv_mutex);
1643 memcpy(tcp_ses->workstation_RFC1001_name,
1644 ctx->source_rfc1001_name, RFC1001_NAME_LEN_WITH_NULL);
1645 memcpy(tcp_ses->server_RFC1001_name,
1646 ctx->target_rfc1001_name, RFC1001_NAME_LEN_WITH_NULL);
1647 tcp_ses->session_estab = false;
1648 tcp_ses->sequence_number = 0;
1649 tcp_ses->reconnect_instance = 1;
1650 tcp_ses->lstrp = jiffies;
1651 tcp_ses->compress_algorithm = cpu_to_le16(ctx->compression);
1652 spin_lock_init(&tcp_ses->req_lock);
1653 spin_lock_init(&tcp_ses->srv_lock);
1654 spin_lock_init(&tcp_ses->mid_lock);
1655 INIT_LIST_HEAD(&tcp_ses->tcp_ses_list);
1656 INIT_LIST_HEAD(&tcp_ses->smb_ses_list);
1657 INIT_DELAYED_WORK(&tcp_ses->echo, cifs_echo_request);
1658 INIT_DELAYED_WORK(&tcp_ses->resolve, cifs_resolve_server);
1659 INIT_DELAYED_WORK(&tcp_ses->reconnect, smb2_reconnect_server);
1660 mutex_init(&tcp_ses->reconnect_mutex);
1661#ifdef CONFIG_CIFS_DFS_UPCALL
1662 mutex_init(&tcp_ses->refpath_lock);
1663#endif
1664 memcpy(&tcp_ses->srcaddr, &ctx->srcaddr,
1665 sizeof(tcp_ses->srcaddr));
1666 memcpy(&tcp_ses->dstaddr, &ctx->dstaddr,
1667 sizeof(tcp_ses->dstaddr));
1668 if (ctx->use_client_guid)
1669 memcpy(tcp_ses->client_guid, ctx->client_guid,
1670 SMB2_CLIENT_GUID_SIZE);
1671 else
1672 generate_random_uuid(tcp_ses->client_guid);
1673 /*
1674 * at this point we are the only ones with the pointer
1675 * to the struct since the kernel thread not created yet
1676 * no need to spinlock this init of tcpStatus or srv_count
1677 */
1678 tcp_ses->tcpStatus = CifsNew;
1679 ++tcp_ses->srv_count;
1680
1681 if (ctx->echo_interval >= SMB_ECHO_INTERVAL_MIN &&
1682 ctx->echo_interval <= SMB_ECHO_INTERVAL_MAX)
1683 tcp_ses->echo_interval = ctx->echo_interval * HZ;
1684 else
1685 tcp_ses->echo_interval = SMB_ECHO_INTERVAL_DEFAULT * HZ;
1686 if (tcp_ses->rdma) {
1687#ifndef CONFIG_CIFS_SMB_DIRECT
1688 cifs_dbg(VFS, "CONFIG_CIFS_SMB_DIRECT is not enabled\n");
1689 rc = -ENOENT;
1690 goto out_err_crypto_release;
1691#endif
1692 tcp_ses->smbd_conn = smbd_get_connection(
1693 tcp_ses, (struct sockaddr *)&ctx->dstaddr);
1694 if (tcp_ses->smbd_conn) {
1695 cifs_dbg(VFS, "RDMA transport established\n");
1696 rc = 0;
1697 goto smbd_connected;
1698 } else {
1699 rc = -ENOENT;
1700 goto out_err_crypto_release;
1701 }
1702 }
1703 rc = ip_connect(tcp_ses);
1704 if (rc < 0) {
1705 cifs_dbg(VFS, "Error connecting to socket. Aborting operation.\n");
1706 goto out_err_crypto_release;
1707 }
1708smbd_connected:
1709 /*
1710 * since we're in a cifs function already, we know that
1711 * this will succeed. No need for try_module_get().
1712 */
1713 __module_get(THIS_MODULE);
1714 tcp_ses->tsk = kthread_run(cifs_demultiplex_thread,
1715 tcp_ses, "cifsd");
1716 if (IS_ERR(tcp_ses->tsk)) {
1717 rc = PTR_ERR(tcp_ses->tsk);
1718 cifs_dbg(VFS, "error %d create cifsd thread\n", rc);
1719 module_put(THIS_MODULE);
1720 goto out_err_crypto_release;
1721 }
1722 tcp_ses->min_offload = ctx->min_offload;
1723 /*
1724 * at this point we are the only ones with the pointer
1725 * to the struct since the kernel thread not created yet
1726 * no need to spinlock this update of tcpStatus
1727 */
1728 spin_lock(&tcp_ses->srv_lock);
1729 tcp_ses->tcpStatus = CifsNeedNegotiate;
1730 spin_unlock(&tcp_ses->srv_lock);
1731
1732 if ((ctx->max_credits < 20) || (ctx->max_credits > 60000))
1733 tcp_ses->max_credits = SMB2_MAX_CREDITS_AVAILABLE;
1734 else
1735 tcp_ses->max_credits = ctx->max_credits;
1736
1737 tcp_ses->nr_targets = 1;
1738 tcp_ses->ignore_signature = ctx->ignore_signature;
1739 /* thread spawned, put it on the list */
1740 spin_lock(&cifs_tcp_ses_lock);
1741 list_add(&tcp_ses->tcp_ses_list, &cifs_tcp_ses_list);
1742 spin_unlock(&cifs_tcp_ses_lock);
1743
1744 /* queue echo request delayed work */
1745 queue_delayed_work(cifsiod_wq, &tcp_ses->echo, tcp_ses->echo_interval);
1746
1747 /* queue dns resolution delayed work */
1748 cifs_dbg(FYI, "%s: next dns resolution scheduled for %d seconds in the future\n",
1749 __func__, SMB_DNS_RESOLVE_INTERVAL_DEFAULT);
1750
1751 queue_delayed_work(cifsiod_wq, &tcp_ses->resolve, (SMB_DNS_RESOLVE_INTERVAL_DEFAULT * HZ));
1752
1753 return tcp_ses;
1754
1755out_err_crypto_release:
1756 cifs_crypto_secmech_release(tcp_ses);
1757
1758 put_net(cifs_net_ns(tcp_ses));
1759
1760out_err:
1761 if (tcp_ses) {
1762 if (CIFS_SERVER_IS_CHAN(tcp_ses))
1763 cifs_put_tcp_session(tcp_ses->primary_server, false);
1764 kfree(tcp_ses->hostname);
1765 kfree(tcp_ses->leaf_fullpath);
1766 if (tcp_ses->ssocket)
1767 sock_release(tcp_ses->ssocket);
1768 kfree(tcp_ses);
1769 }
1770 return ERR_PTR(rc);
1771}
1772
1773/* this function must be called with ses_lock held */
1774static int match_session(struct cifs_ses *ses, struct smb3_fs_context *ctx)
1775{
1776 if (ctx->sectype != Unspecified &&
1777 ctx->sectype != ses->sectype)
1778 return 0;
1779
1780 /*
1781 * If an existing session is limited to less channels than
1782 * requested, it should not be reused
1783 */
1784 spin_lock(&ses->chan_lock);
1785 if (ses->chan_max < ctx->max_channels) {
1786 spin_unlock(&ses->chan_lock);
1787 return 0;
1788 }
1789 spin_unlock(&ses->chan_lock);
1790
1791 switch (ses->sectype) {
1792 case Kerberos:
1793 if (!uid_eq(ctx->cred_uid, ses->cred_uid))
1794 return 0;
1795 break;
1796 default:
1797 /* NULL username means anonymous session */
1798 if (ses->user_name == NULL) {
1799 if (!ctx->nullauth)
1800 return 0;
1801 break;
1802 }
1803
1804 /* anything else takes username/password */
1805 if (strncmp(ses->user_name,
1806 ctx->username ? ctx->username : "",
1807 CIFS_MAX_USERNAME_LEN))
1808 return 0;
1809 if ((ctx->username && strlen(ctx->username) != 0) &&
1810 ses->password != NULL &&
1811 strncmp(ses->password,
1812 ctx->password ? ctx->password : "",
1813 CIFS_MAX_PASSWORD_LEN))
1814 return 0;
1815 }
1816 return 1;
1817}
1818
1819/**
1820 * cifs_setup_ipc - helper to setup the IPC tcon for the session
1821 * @ses: smb session to issue the request on
1822 * @ctx: the superblock configuration context to use for building the
1823 * new tree connection for the IPC (interprocess communication RPC)
1824 *
1825 * A new IPC connection is made and stored in the session
1826 * tcon_ipc. The IPC tcon has the same lifetime as the session.
1827 */
1828static int
1829cifs_setup_ipc(struct cifs_ses *ses, struct smb3_fs_context *ctx)
1830{
1831 int rc = 0, xid;
1832 struct cifs_tcon *tcon;
1833 char unc[SERVER_NAME_LENGTH + sizeof("//x/IPC$")] = {0};
1834 bool seal = false;
1835 struct TCP_Server_Info *server = ses->server;
1836
1837 /*
1838 * If the mount request that resulted in the creation of the
1839 * session requires encryption, force IPC to be encrypted too.
1840 */
1841 if (ctx->seal) {
1842 if (server->capabilities & SMB2_GLOBAL_CAP_ENCRYPTION)
1843 seal = true;
1844 else {
1845 cifs_server_dbg(VFS,
1846 "IPC: server doesn't support encryption\n");
1847 return -EOPNOTSUPP;
1848 }
1849 }
1850
1851 tcon = tconInfoAlloc();
1852 if (tcon == NULL)
1853 return -ENOMEM;
1854
1855 scnprintf(unc, sizeof(unc), "\\\\%s\\IPC$", server->hostname);
1856
1857 xid = get_xid();
1858 tcon->ses = ses;
1859 tcon->ipc = true;
1860 tcon->seal = seal;
1861 rc = server->ops->tree_connect(xid, ses, unc, tcon, ctx->local_nls);
1862 free_xid(xid);
1863
1864 if (rc) {
1865 cifs_server_dbg(VFS, "failed to connect to IPC (rc=%d)\n", rc);
1866 tconInfoFree(tcon);
1867 goto out;
1868 }
1869
1870 cifs_dbg(FYI, "IPC tcon rc=%d ipc tid=0x%x\n", rc, tcon->tid);
1871
1872 spin_lock(&tcon->tc_lock);
1873 tcon->status = TID_GOOD;
1874 spin_unlock(&tcon->tc_lock);
1875 ses->tcon_ipc = tcon;
1876out:
1877 return rc;
1878}
1879
1880/**
1881 * cifs_free_ipc - helper to release the session IPC tcon
1882 * @ses: smb session to unmount the IPC from
1883 *
1884 * Needs to be called everytime a session is destroyed.
1885 *
1886 * On session close, the IPC is closed and the server must release all tcons of the session.
1887 * No need to send a tree disconnect here.
1888 *
1889 * Besides, it will make the server to not close durable and resilient files on session close, as
1890 * specified in MS-SMB2 3.3.5.6 Receiving an SMB2 LOGOFF Request.
1891 */
1892static int
1893cifs_free_ipc(struct cifs_ses *ses)
1894{
1895 struct cifs_tcon *tcon = ses->tcon_ipc;
1896
1897 if (tcon == NULL)
1898 return 0;
1899
1900 tconInfoFree(tcon);
1901 ses->tcon_ipc = NULL;
1902 return 0;
1903}
1904
1905static struct cifs_ses *
1906cifs_find_smb_ses(struct TCP_Server_Info *server, struct smb3_fs_context *ctx)
1907{
1908 struct cifs_ses *ses;
1909
1910 spin_lock(&cifs_tcp_ses_lock);
1911 list_for_each_entry(ses, &server->smb_ses_list, smb_ses_list) {
1912 spin_lock(&ses->ses_lock);
1913 if (ses->ses_status == SES_EXITING) {
1914 spin_unlock(&ses->ses_lock);
1915 continue;
1916 }
1917 if (!match_session(ses, ctx)) {
1918 spin_unlock(&ses->ses_lock);
1919 continue;
1920 }
1921 spin_unlock(&ses->ses_lock);
1922
1923 ++ses->ses_count;
1924 spin_unlock(&cifs_tcp_ses_lock);
1925 return ses;
1926 }
1927 spin_unlock(&cifs_tcp_ses_lock);
1928 return NULL;
1929}
1930
1931void cifs_put_smb_ses(struct cifs_ses *ses)
1932{
1933 unsigned int rc, xid;
1934 unsigned int chan_count;
1935 struct TCP_Server_Info *server = ses->server;
1936
1937 spin_lock(&ses->ses_lock);
1938 if (ses->ses_status == SES_EXITING) {
1939 spin_unlock(&ses->ses_lock);
1940 return;
1941 }
1942 spin_unlock(&ses->ses_lock);
1943
1944 cifs_dbg(FYI, "%s: ses_count=%d\n", __func__, ses->ses_count);
1945 cifs_dbg(FYI,
1946 "%s: ses ipc: %s\n", __func__, ses->tcon_ipc ? ses->tcon_ipc->tree_name : "NONE");
1947
1948 spin_lock(&cifs_tcp_ses_lock);
1949 if (--ses->ses_count > 0) {
1950 spin_unlock(&cifs_tcp_ses_lock);
1951 return;
1952 }
1953 spin_unlock(&cifs_tcp_ses_lock);
1954
1955 /* ses_count can never go negative */
1956 WARN_ON(ses->ses_count < 0);
1957
1958 if (ses->ses_status == SES_GOOD)
1959 ses->ses_status = SES_EXITING;
1960
1961 cifs_free_ipc(ses);
1962
1963 if (ses->ses_status == SES_EXITING && server->ops->logoff) {
1964 xid = get_xid();
1965 rc = server->ops->logoff(xid, ses);
1966 if (rc)
1967 cifs_server_dbg(VFS, "%s: Session Logoff failure rc=%d\n",
1968 __func__, rc);
1969 _free_xid(xid);
1970 }
1971
1972 spin_lock(&cifs_tcp_ses_lock);
1973 list_del_init(&ses->smb_ses_list);
1974 spin_unlock(&cifs_tcp_ses_lock);
1975
1976 chan_count = ses->chan_count;
1977
1978 /* close any extra channels */
1979 if (chan_count > 1) {
1980 int i;
1981
1982 for (i = 1; i < chan_count; i++) {
1983 if (ses->chans[i].iface) {
1984 kref_put(&ses->chans[i].iface->refcount, release_iface);
1985 ses->chans[i].iface = NULL;
1986 }
1987 cifs_put_tcp_session(ses->chans[i].server, 0);
1988 ses->chans[i].server = NULL;
1989 }
1990 }
1991
1992 sesInfoFree(ses);
1993 cifs_put_tcp_session(server, 0);
1994}
1995
1996#ifdef CONFIG_KEYS
1997
1998/* strlen("cifs:a:") + CIFS_MAX_DOMAINNAME_LEN + 1 */
1999#define CIFSCREDS_DESC_SIZE (7 + CIFS_MAX_DOMAINNAME_LEN + 1)
2000
2001/* Populate username and pw fields from keyring if possible */
2002static int
2003cifs_set_cifscreds(struct smb3_fs_context *ctx, struct cifs_ses *ses)
2004{
2005 int rc = 0;
2006 int is_domain = 0;
2007 const char *delim, *payload;
2008 char *desc;
2009 ssize_t len;
2010 struct key *key;
2011 struct TCP_Server_Info *server = ses->server;
2012 struct sockaddr_in *sa;
2013 struct sockaddr_in6 *sa6;
2014 const struct user_key_payload *upayload;
2015
2016 desc = kmalloc(CIFSCREDS_DESC_SIZE, GFP_KERNEL);
2017 if (!desc)
2018 return -ENOMEM;
2019
2020 /* try to find an address key first */
2021 switch (server->dstaddr.ss_family) {
2022 case AF_INET:
2023 sa = (struct sockaddr_in *)&server->dstaddr;
2024 sprintf(desc, "cifs:a:%pI4", &sa->sin_addr.s_addr);
2025 break;
2026 case AF_INET6:
2027 sa6 = (struct sockaddr_in6 *)&server->dstaddr;
2028 sprintf(desc, "cifs:a:%pI6c", &sa6->sin6_addr.s6_addr);
2029 break;
2030 default:
2031 cifs_dbg(FYI, "Bad ss_family (%hu)\n",
2032 server->dstaddr.ss_family);
2033 rc = -EINVAL;
2034 goto out_err;
2035 }
2036
2037 cifs_dbg(FYI, "%s: desc=%s\n", __func__, desc);
2038 key = request_key(&key_type_logon, desc, "");
2039 if (IS_ERR(key)) {
2040 if (!ses->domainName) {
2041 cifs_dbg(FYI, "domainName is NULL\n");
2042 rc = PTR_ERR(key);
2043 goto out_err;
2044 }
2045
2046 /* didn't work, try to find a domain key */
2047 sprintf(desc, "cifs:d:%s", ses->domainName);
2048 cifs_dbg(FYI, "%s: desc=%s\n", __func__, desc);
2049 key = request_key(&key_type_logon, desc, "");
2050 if (IS_ERR(key)) {
2051 rc = PTR_ERR(key);
2052 goto out_err;
2053 }
2054 is_domain = 1;
2055 }
2056
2057 down_read(&key->sem);
2058 upayload = user_key_payload_locked(key);
2059 if (IS_ERR_OR_NULL(upayload)) {
2060 rc = upayload ? PTR_ERR(upayload) : -EINVAL;
2061 goto out_key_put;
2062 }
2063
2064 /* find first : in payload */
2065 payload = upayload->data;
2066 delim = strnchr(payload, upayload->datalen, ':');
2067 cifs_dbg(FYI, "payload=%s\n", payload);
2068 if (!delim) {
2069 cifs_dbg(FYI, "Unable to find ':' in payload (datalen=%d)\n",
2070 upayload->datalen);
2071 rc = -EINVAL;
2072 goto out_key_put;
2073 }
2074
2075 len = delim - payload;
2076 if (len > CIFS_MAX_USERNAME_LEN || len <= 0) {
2077 cifs_dbg(FYI, "Bad value from username search (len=%zd)\n",
2078 len);
2079 rc = -EINVAL;
2080 goto out_key_put;
2081 }
2082
2083 ctx->username = kstrndup(payload, len, GFP_KERNEL);
2084 if (!ctx->username) {
2085 cifs_dbg(FYI, "Unable to allocate %zd bytes for username\n",
2086 len);
2087 rc = -ENOMEM;
2088 goto out_key_put;
2089 }
2090 cifs_dbg(FYI, "%s: username=%s\n", __func__, ctx->username);
2091
2092 len = key->datalen - (len + 1);
2093 if (len > CIFS_MAX_PASSWORD_LEN || len <= 0) {
2094 cifs_dbg(FYI, "Bad len for password search (len=%zd)\n", len);
2095 rc = -EINVAL;
2096 kfree(ctx->username);
2097 ctx->username = NULL;
2098 goto out_key_put;
2099 }
2100
2101 ++delim;
2102 ctx->password = kstrndup(delim, len, GFP_KERNEL);
2103 if (!ctx->password) {
2104 cifs_dbg(FYI, "Unable to allocate %zd bytes for password\n",
2105 len);
2106 rc = -ENOMEM;
2107 kfree(ctx->username);
2108 ctx->username = NULL;
2109 goto out_key_put;
2110 }
2111
2112 /*
2113 * If we have a domain key then we must set the domainName in the
2114 * for the request.
2115 */
2116 if (is_domain && ses->domainName) {
2117 ctx->domainname = kstrdup(ses->domainName, GFP_KERNEL);
2118 if (!ctx->domainname) {
2119 cifs_dbg(FYI, "Unable to allocate %zd bytes for domain\n",
2120 len);
2121 rc = -ENOMEM;
2122 kfree(ctx->username);
2123 ctx->username = NULL;
2124 kfree_sensitive(ctx->password);
2125 ctx->password = NULL;
2126 goto out_key_put;
2127 }
2128 }
2129
2130 strscpy(ctx->workstation_name, ses->workstation_name, sizeof(ctx->workstation_name));
2131
2132out_key_put:
2133 up_read(&key->sem);
2134 key_put(key);
2135out_err:
2136 kfree(desc);
2137 cifs_dbg(FYI, "%s: returning %d\n", __func__, rc);
2138 return rc;
2139}
2140#else /* ! CONFIG_KEYS */
2141static inline int
2142cifs_set_cifscreds(struct smb3_fs_context *ctx __attribute__((unused)),
2143 struct cifs_ses *ses __attribute__((unused)))
2144{
2145 return -ENOSYS;
2146}
2147#endif /* CONFIG_KEYS */
2148
2149/**
2150 * cifs_get_smb_ses - get a session matching @ctx data from @server
2151 * @server: server to setup the session to
2152 * @ctx: superblock configuration context to use to setup the session
2153 *
2154 * This function assumes it is being called from cifs_mount() where we
2155 * already got a server reference (server refcount +1). See
2156 * cifs_get_tcon() for refcount explanations.
2157 */
2158struct cifs_ses *
2159cifs_get_smb_ses(struct TCP_Server_Info *server, struct smb3_fs_context *ctx)
2160{
2161 int rc = 0;
2162 unsigned int xid;
2163 struct cifs_ses *ses;
2164 struct sockaddr_in *addr = (struct sockaddr_in *)&server->dstaddr;
2165 struct sockaddr_in6 *addr6 = (struct sockaddr_in6 *)&server->dstaddr;
2166
2167 xid = get_xid();
2168
2169 ses = cifs_find_smb_ses(server, ctx);
2170 if (ses) {
2171 cifs_dbg(FYI, "Existing smb sess found (status=%d)\n",
2172 ses->ses_status);
2173
2174 spin_lock(&ses->chan_lock);
2175 if (cifs_chan_needs_reconnect(ses, server)) {
2176 spin_unlock(&ses->chan_lock);
2177 cifs_dbg(FYI, "Session needs reconnect\n");
2178
2179 mutex_lock(&ses->session_mutex);
2180 rc = cifs_negotiate_protocol(xid, ses, server);
2181 if (rc) {
2182 mutex_unlock(&ses->session_mutex);
2183 /* problem -- put our ses reference */
2184 cifs_put_smb_ses(ses);
2185 free_xid(xid);
2186 return ERR_PTR(rc);
2187 }
2188
2189 rc = cifs_setup_session(xid, ses, server,
2190 ctx->local_nls);
2191 if (rc) {
2192 mutex_unlock(&ses->session_mutex);
2193 /* problem -- put our reference */
2194 cifs_put_smb_ses(ses);
2195 free_xid(xid);
2196 return ERR_PTR(rc);
2197 }
2198 mutex_unlock(&ses->session_mutex);
2199
2200 spin_lock(&ses->chan_lock);
2201 }
2202 spin_unlock(&ses->chan_lock);
2203
2204 /* existing SMB ses has a server reference already */
2205 cifs_put_tcp_session(server, 0);
2206 free_xid(xid);
2207 return ses;
2208 }
2209
2210 rc = -ENOMEM;
2211
2212 cifs_dbg(FYI, "Existing smb sess not found\n");
2213 ses = sesInfoAlloc();
2214 if (ses == NULL)
2215 goto get_ses_fail;
2216
2217 /* new SMB session uses our server ref */
2218 ses->server = server;
2219 if (server->dstaddr.ss_family == AF_INET6)
2220 sprintf(ses->ip_addr, "%pI6", &addr6->sin6_addr);
2221 else
2222 sprintf(ses->ip_addr, "%pI4", &addr->sin_addr);
2223
2224 if (ctx->username) {
2225 ses->user_name = kstrdup(ctx->username, GFP_KERNEL);
2226 if (!ses->user_name)
2227 goto get_ses_fail;
2228 }
2229
2230 /* ctx->password freed at unmount */
2231 if (ctx->password) {
2232 ses->password = kstrdup(ctx->password, GFP_KERNEL);
2233 if (!ses->password)
2234 goto get_ses_fail;
2235 }
2236 if (ctx->domainname) {
2237 ses->domainName = kstrdup(ctx->domainname, GFP_KERNEL);
2238 if (!ses->domainName)
2239 goto get_ses_fail;
2240 }
2241
2242 strscpy(ses->workstation_name, ctx->workstation_name, sizeof(ses->workstation_name));
2243
2244 if (ctx->domainauto)
2245 ses->domainAuto = ctx->domainauto;
2246 ses->cred_uid = ctx->cred_uid;
2247 ses->linux_uid = ctx->linux_uid;
2248
2249 ses->sectype = ctx->sectype;
2250 ses->sign = ctx->sign;
2251
2252 /* add server as first channel */
2253 spin_lock(&ses->chan_lock);
2254 ses->chans[0].server = server;
2255 ses->chan_count = 1;
2256 ses->chan_max = ctx->multichannel ? ctx->max_channels:1;
2257 ses->chans_need_reconnect = 1;
2258 spin_unlock(&ses->chan_lock);
2259
2260 mutex_lock(&ses->session_mutex);
2261 rc = cifs_negotiate_protocol(xid, ses, server);
2262 if (!rc)
2263 rc = cifs_setup_session(xid, ses, server, ctx->local_nls);
2264 mutex_unlock(&ses->session_mutex);
2265
2266 /* each channel uses a different signing key */
2267 spin_lock(&ses->chan_lock);
2268 memcpy(ses->chans[0].signkey, ses->smb3signingkey,
2269 sizeof(ses->smb3signingkey));
2270 spin_unlock(&ses->chan_lock);
2271
2272 if (rc)
2273 goto get_ses_fail;
2274
2275 /*
2276 * success, put it on the list and add it as first channel
2277 * note: the session becomes active soon after this. So you'll
2278 * need to lock before changing something in the session.
2279 */
2280 spin_lock(&cifs_tcp_ses_lock);
2281 list_add(&ses->smb_ses_list, &server->smb_ses_list);
2282 spin_unlock(&cifs_tcp_ses_lock);
2283
2284 cifs_setup_ipc(ses, ctx);
2285
2286 free_xid(xid);
2287
2288 return ses;
2289
2290get_ses_fail:
2291 sesInfoFree(ses);
2292 free_xid(xid);
2293 return ERR_PTR(rc);
2294}
2295
2296/* this function must be called with tc_lock held */
2297static int match_tcon(struct cifs_tcon *tcon, struct smb3_fs_context *ctx, bool dfs_super_cmp)
2298{
2299 if (tcon->status == TID_EXITING)
2300 return 0;
2301 /* Skip UNC validation when matching DFS superblocks */
2302 if (!dfs_super_cmp && strncmp(tcon->tree_name, ctx->UNC, MAX_TREE_SIZE))
2303 return 0;
2304 if (tcon->seal != ctx->seal)
2305 return 0;
2306 if (tcon->snapshot_time != ctx->snapshot_time)
2307 return 0;
2308 if (tcon->handle_timeout != ctx->handle_timeout)
2309 return 0;
2310 if (tcon->no_lease != ctx->no_lease)
2311 return 0;
2312 if (tcon->nodelete != ctx->nodelete)
2313 return 0;
2314 return 1;
2315}
2316
2317static struct cifs_tcon *
2318cifs_find_tcon(struct cifs_ses *ses, struct smb3_fs_context *ctx)
2319{
2320 struct cifs_tcon *tcon;
2321
2322 spin_lock(&cifs_tcp_ses_lock);
2323 list_for_each_entry(tcon, &ses->tcon_list, tcon_list) {
2324 spin_lock(&tcon->tc_lock);
2325 if (!match_tcon(tcon, ctx, false)) {
2326 spin_unlock(&tcon->tc_lock);
2327 continue;
2328 }
2329 ++tcon->tc_count;
2330 spin_unlock(&tcon->tc_lock);
2331 spin_unlock(&cifs_tcp_ses_lock);
2332 return tcon;
2333 }
2334 spin_unlock(&cifs_tcp_ses_lock);
2335 return NULL;
2336}
2337
2338void
2339cifs_put_tcon(struct cifs_tcon *tcon)
2340{
2341 unsigned int xid;
2342 struct cifs_ses *ses;
2343
2344 /*
2345 * IPC tcon share the lifetime of their session and are
2346 * destroyed in the session put function
2347 */
2348 if (tcon == NULL || tcon->ipc)
2349 return;
2350
2351 ses = tcon->ses;
2352 cifs_dbg(FYI, "%s: tc_count=%d\n", __func__, tcon->tc_count);
2353 spin_lock(&cifs_tcp_ses_lock);
2354 spin_lock(&tcon->tc_lock);
2355 if (--tcon->tc_count > 0) {
2356 spin_unlock(&tcon->tc_lock);
2357 spin_unlock(&cifs_tcp_ses_lock);
2358 return;
2359 }
2360
2361 /* tc_count can never go negative */
2362 WARN_ON(tcon->tc_count < 0);
2363
2364 list_del_init(&tcon->tcon_list);
2365 spin_unlock(&tcon->tc_lock);
2366 spin_unlock(&cifs_tcp_ses_lock);
2367
2368 /* cancel polling of interfaces */
2369 cancel_delayed_work_sync(&tcon->query_interfaces);
2370
2371 if (tcon->use_witness) {
2372 int rc;
2373
2374 rc = cifs_swn_unregister(tcon);
2375 if (rc < 0) {
2376 cifs_dbg(VFS, "%s: Failed to unregister for witness notifications: %d\n",
2377 __func__, rc);
2378 }
2379 }
2380
2381 xid = get_xid();
2382 if (ses->server->ops->tree_disconnect)
2383 ses->server->ops->tree_disconnect(xid, tcon);
2384 _free_xid(xid);
2385
2386 cifs_fscache_release_super_cookie(tcon);
2387 tconInfoFree(tcon);
2388 cifs_put_smb_ses(ses);
2389}
2390
2391/**
2392 * cifs_get_tcon - get a tcon matching @ctx data from @ses
2393 * @ses: smb session to issue the request on
2394 * @ctx: the superblock configuration context to use for building the
2395 *
2396 * - tcon refcount is the number of mount points using the tcon.
2397 * - ses refcount is the number of tcon using the session.
2398 *
2399 * 1. This function assumes it is being called from cifs_mount() where
2400 * we already got a session reference (ses refcount +1).
2401 *
2402 * 2. Since we're in the context of adding a mount point, the end
2403 * result should be either:
2404 *
2405 * a) a new tcon already allocated with refcount=1 (1 mount point) and
2406 * its session refcount incremented (1 new tcon). This +1 was
2407 * already done in (1).
2408 *
2409 * b) an existing tcon with refcount+1 (add a mount point to it) and
2410 * identical ses refcount (no new tcon). Because of (1) we need to
2411 * decrement the ses refcount.
2412 */
2413static struct cifs_tcon *
2414cifs_get_tcon(struct cifs_ses *ses, struct smb3_fs_context *ctx)
2415{
2416 int rc, xid;
2417 struct cifs_tcon *tcon;
2418
2419 tcon = cifs_find_tcon(ses, ctx);
2420 if (tcon) {
2421 /*
2422 * tcon has refcount already incremented but we need to
2423 * decrement extra ses reference gotten by caller (case b)
2424 */
2425 cifs_dbg(FYI, "Found match on UNC path\n");
2426 cifs_put_smb_ses(ses);
2427 return tcon;
2428 }
2429
2430 if (!ses->server->ops->tree_connect) {
2431 rc = -ENOSYS;
2432 goto out_fail;
2433 }
2434
2435 tcon = tconInfoAlloc();
2436 if (tcon == NULL) {
2437 rc = -ENOMEM;
2438 goto out_fail;
2439 }
2440
2441 if (ctx->snapshot_time) {
2442 if (ses->server->vals->protocol_id == 0) {
2443 cifs_dbg(VFS,
2444 "Use SMB2 or later for snapshot mount option\n");
2445 rc = -EOPNOTSUPP;
2446 goto out_fail;
2447 } else
2448 tcon->snapshot_time = ctx->snapshot_time;
2449 }
2450
2451 if (ctx->handle_timeout) {
2452 if (ses->server->vals->protocol_id == 0) {
2453 cifs_dbg(VFS,
2454 "Use SMB2.1 or later for handle timeout option\n");
2455 rc = -EOPNOTSUPP;
2456 goto out_fail;
2457 } else
2458 tcon->handle_timeout = ctx->handle_timeout;
2459 }
2460
2461 tcon->ses = ses;
2462 if (ctx->password) {
2463 tcon->password = kstrdup(ctx->password, GFP_KERNEL);
2464 if (!tcon->password) {
2465 rc = -ENOMEM;
2466 goto out_fail;
2467 }
2468 }
2469
2470 if (ctx->seal) {
2471 if (ses->server->vals->protocol_id == 0) {
2472 cifs_dbg(VFS,
2473 "SMB3 or later required for encryption\n");
2474 rc = -EOPNOTSUPP;
2475 goto out_fail;
2476 } else if (tcon->ses->server->capabilities &
2477 SMB2_GLOBAL_CAP_ENCRYPTION)
2478 tcon->seal = true;
2479 else {
2480 cifs_dbg(VFS, "Encryption is not supported on share\n");
2481 rc = -EOPNOTSUPP;
2482 goto out_fail;
2483 }
2484 }
2485
2486 if (ctx->linux_ext) {
2487 if (ses->server->posix_ext_supported) {
2488 tcon->posix_extensions = true;
2489 pr_warn_once("SMB3.11 POSIX Extensions are experimental\n");
2490 } else if ((ses->server->vals->protocol_id == SMB311_PROT_ID) ||
2491 (strcmp(ses->server->vals->version_string,
2492 SMB3ANY_VERSION_STRING) == 0) ||
2493 (strcmp(ses->server->vals->version_string,
2494 SMBDEFAULT_VERSION_STRING) == 0)) {
2495 cifs_dbg(VFS, "Server does not support mounting with posix SMB3.11 extensions\n");
2496 rc = -EOPNOTSUPP;
2497 goto out_fail;
2498 } else {
2499 cifs_dbg(VFS, "Check vers= mount option. SMB3.11 "
2500 "disabled but required for POSIX extensions\n");
2501 rc = -EOPNOTSUPP;
2502 goto out_fail;
2503 }
2504 }
2505
2506 xid = get_xid();
2507 rc = ses->server->ops->tree_connect(xid, ses, ctx->UNC, tcon,
2508 ctx->local_nls);
2509 free_xid(xid);
2510 cifs_dbg(FYI, "Tcon rc = %d\n", rc);
2511 if (rc)
2512 goto out_fail;
2513
2514 tcon->use_persistent = false;
2515 /* check if SMB2 or later, CIFS does not support persistent handles */
2516 if (ctx->persistent) {
2517 if (ses->server->vals->protocol_id == 0) {
2518 cifs_dbg(VFS,
2519 "SMB3 or later required for persistent handles\n");
2520 rc = -EOPNOTSUPP;
2521 goto out_fail;
2522 } else if (ses->server->capabilities &
2523 SMB2_GLOBAL_CAP_PERSISTENT_HANDLES)
2524 tcon->use_persistent = true;
2525 else /* persistent handles requested but not supported */ {
2526 cifs_dbg(VFS,
2527 "Persistent handles not supported on share\n");
2528 rc = -EOPNOTSUPP;
2529 goto out_fail;
2530 }
2531 } else if ((tcon->capabilities & SMB2_SHARE_CAP_CONTINUOUS_AVAILABILITY)
2532 && (ses->server->capabilities & SMB2_GLOBAL_CAP_PERSISTENT_HANDLES)
2533 && (ctx->nopersistent == false)) {
2534 cifs_dbg(FYI, "enabling persistent handles\n");
2535 tcon->use_persistent = true;
2536 } else if (ctx->resilient) {
2537 if (ses->server->vals->protocol_id == 0) {
2538 cifs_dbg(VFS,
2539 "SMB2.1 or later required for resilient handles\n");
2540 rc = -EOPNOTSUPP;
2541 goto out_fail;
2542 }
2543 tcon->use_resilient = true;
2544 }
2545
2546 tcon->use_witness = false;
2547 if (IS_ENABLED(CONFIG_CIFS_SWN_UPCALL) && ctx->witness) {
2548 if (ses->server->vals->protocol_id >= SMB30_PROT_ID) {
2549 if (tcon->capabilities & SMB2_SHARE_CAP_CLUSTER) {
2550 /*
2551 * Set witness in use flag in first place
2552 * to retry registration in the echo task
2553 */
2554 tcon->use_witness = true;
2555 /* And try to register immediately */
2556 rc = cifs_swn_register(tcon);
2557 if (rc < 0) {
2558 cifs_dbg(VFS, "Failed to register for witness notifications: %d\n", rc);
2559 goto out_fail;
2560 }
2561 } else {
2562 /* TODO: try to extend for non-cluster uses (eg multichannel) */
2563 cifs_dbg(VFS, "witness requested on mount but no CLUSTER capability on share\n");
2564 rc = -EOPNOTSUPP;
2565 goto out_fail;
2566 }
2567 } else {
2568 cifs_dbg(VFS, "SMB3 or later required for witness option\n");
2569 rc = -EOPNOTSUPP;
2570 goto out_fail;
2571 }
2572 }
2573
2574 /* If the user really knows what they are doing they can override */
2575 if (tcon->share_flags & SMB2_SHAREFLAG_NO_CACHING) {
2576 if (ctx->cache_ro)
2577 cifs_dbg(VFS, "cache=ro requested on mount but NO_CACHING flag set on share\n");
2578 else if (ctx->cache_rw)
2579 cifs_dbg(VFS, "cache=singleclient requested on mount but NO_CACHING flag set on share\n");
2580 }
2581
2582 if (ctx->no_lease) {
2583 if (ses->server->vals->protocol_id == 0) {
2584 cifs_dbg(VFS,
2585 "SMB2 or later required for nolease option\n");
2586 rc = -EOPNOTSUPP;
2587 goto out_fail;
2588 } else
2589 tcon->no_lease = ctx->no_lease;
2590 }
2591
2592 /*
2593 * We can have only one retry value for a connection to a share so for
2594 * resources mounted more than once to the same server share the last
2595 * value passed in for the retry flag is used.
2596 */
2597 tcon->retry = ctx->retry;
2598 tcon->nocase = ctx->nocase;
2599 tcon->broken_sparse_sup = ctx->no_sparse;
2600 if (ses->server->capabilities & SMB2_GLOBAL_CAP_DIRECTORY_LEASING)
2601 tcon->nohandlecache = ctx->nohandlecache;
2602 else
2603 tcon->nohandlecache = true;
2604 tcon->nodelete = ctx->nodelete;
2605 tcon->local_lease = ctx->local_lease;
2606 INIT_LIST_HEAD(&tcon->pending_opens);
2607 tcon->status = TID_GOOD;
2608
2609 INIT_DELAYED_WORK(&tcon->query_interfaces,
2610 smb2_query_server_interfaces);
2611 if (ses->server->dialect >= SMB30_PROT_ID &&
2612 (ses->server->capabilities & SMB2_GLOBAL_CAP_MULTI_CHANNEL)) {
2613 /* schedule query interfaces poll */
2614 queue_delayed_work(cifsiod_wq, &tcon->query_interfaces,
2615 (SMB_INTERFACE_POLL_INTERVAL * HZ));
2616 }
2617
2618 spin_lock(&cifs_tcp_ses_lock);
2619 list_add(&tcon->tcon_list, &ses->tcon_list);
2620 spin_unlock(&cifs_tcp_ses_lock);
2621
2622 return tcon;
2623
2624out_fail:
2625 tconInfoFree(tcon);
2626 return ERR_PTR(rc);
2627}
2628
2629void
2630cifs_put_tlink(struct tcon_link *tlink)
2631{
2632 if (!tlink || IS_ERR(tlink))
2633 return;
2634
2635 if (!atomic_dec_and_test(&tlink->tl_count) ||
2636 test_bit(TCON_LINK_IN_TREE, &tlink->tl_flags)) {
2637 tlink->tl_time = jiffies;
2638 return;
2639 }
2640
2641 if (!IS_ERR(tlink_tcon(tlink)))
2642 cifs_put_tcon(tlink_tcon(tlink));
2643 kfree(tlink);
2644 return;
2645}
2646
2647static int
2648compare_mount_options(struct super_block *sb, struct cifs_mnt_data *mnt_data)
2649{
2650 struct cifs_sb_info *old = CIFS_SB(sb);
2651 struct cifs_sb_info *new = mnt_data->cifs_sb;
2652 unsigned int oldflags = old->mnt_cifs_flags & CIFS_MOUNT_MASK;
2653 unsigned int newflags = new->mnt_cifs_flags & CIFS_MOUNT_MASK;
2654
2655 if ((sb->s_flags & CIFS_MS_MASK) != (mnt_data->flags & CIFS_MS_MASK))
2656 return 0;
2657
2658 if (old->mnt_cifs_serverino_autodisabled)
2659 newflags &= ~CIFS_MOUNT_SERVER_INUM;
2660
2661 if (oldflags != newflags)
2662 return 0;
2663
2664 /*
2665 * We want to share sb only if we don't specify an r/wsize or
2666 * specified r/wsize is greater than or equal to existing one.
2667 */
2668 if (new->ctx->wsize && new->ctx->wsize < old->ctx->wsize)
2669 return 0;
2670
2671 if (new->ctx->rsize && new->ctx->rsize < old->ctx->rsize)
2672 return 0;
2673
2674 if (!uid_eq(old->ctx->linux_uid, new->ctx->linux_uid) ||
2675 !gid_eq(old->ctx->linux_gid, new->ctx->linux_gid))
2676 return 0;
2677
2678 if (old->ctx->file_mode != new->ctx->file_mode ||
2679 old->ctx->dir_mode != new->ctx->dir_mode)
2680 return 0;
2681
2682 if (strcmp(old->local_nls->charset, new->local_nls->charset))
2683 return 0;
2684
2685 if (old->ctx->acregmax != new->ctx->acregmax)
2686 return 0;
2687 if (old->ctx->acdirmax != new->ctx->acdirmax)
2688 return 0;
2689 if (old->ctx->closetimeo != new->ctx->closetimeo)
2690 return 0;
2691
2692 return 1;
2693}
2694
2695static int
2696match_prepath(struct super_block *sb, struct cifs_mnt_data *mnt_data)
2697{
2698 struct cifs_sb_info *old = CIFS_SB(sb);
2699 struct cifs_sb_info *new = mnt_data->cifs_sb;
2700 bool old_set = (old->mnt_cifs_flags & CIFS_MOUNT_USE_PREFIX_PATH) &&
2701 old->prepath;
2702 bool new_set = (new->mnt_cifs_flags & CIFS_MOUNT_USE_PREFIX_PATH) &&
2703 new->prepath;
2704
2705 if (old_set && new_set && !strcmp(new->prepath, old->prepath))
2706 return 1;
2707 else if (!old_set && !new_set)
2708 return 1;
2709
2710 return 0;
2711}
2712
2713int
2714cifs_match_super(struct super_block *sb, void *data)
2715{
2716 struct cifs_mnt_data *mnt_data = data;
2717 struct smb3_fs_context *ctx;
2718 struct cifs_sb_info *cifs_sb;
2719 struct TCP_Server_Info *tcp_srv;
2720 struct cifs_ses *ses;
2721 struct cifs_tcon *tcon;
2722 struct tcon_link *tlink;
2723 bool dfs_super_cmp;
2724 int rc = 0;
2725
2726 spin_lock(&cifs_tcp_ses_lock);
2727 cifs_sb = CIFS_SB(sb);
2728 tlink = cifs_get_tlink(cifs_sb_master_tlink(cifs_sb));
2729 if (tlink == NULL) {
2730 /* can not match superblock if tlink were ever null */
2731 spin_unlock(&cifs_tcp_ses_lock);
2732 return 0;
2733 }
2734 tcon = tlink_tcon(tlink);
2735 ses = tcon->ses;
2736 tcp_srv = ses->server;
2737
2738 dfs_super_cmp = IS_ENABLED(CONFIG_CIFS_DFS_UPCALL) && tcp_srv->origin_fullpath;
2739
2740 ctx = mnt_data->ctx;
2741
2742 spin_lock(&tcp_srv->srv_lock);
2743 spin_lock(&ses->ses_lock);
2744 spin_lock(&tcon->tc_lock);
2745 if (!match_server(tcp_srv, ctx, dfs_super_cmp) ||
2746 !match_session(ses, ctx) ||
2747 !match_tcon(tcon, ctx, dfs_super_cmp) ||
2748 !match_prepath(sb, mnt_data)) {
2749 rc = 0;
2750 goto out;
2751 }
2752
2753 rc = compare_mount_options(sb, mnt_data);
2754out:
2755 spin_unlock(&tcon->tc_lock);
2756 spin_unlock(&ses->ses_lock);
2757 spin_unlock(&tcp_srv->srv_lock);
2758
2759 spin_unlock(&cifs_tcp_ses_lock);
2760 cifs_put_tlink(tlink);
2761 return rc;
2762}
2763
2764#ifdef CONFIG_DEBUG_LOCK_ALLOC
2765static struct lock_class_key cifs_key[2];
2766static struct lock_class_key cifs_slock_key[2];
2767
2768static inline void
2769cifs_reclassify_socket4(struct socket *sock)
2770{
2771 struct sock *sk = sock->sk;
2772 BUG_ON(!sock_allow_reclassification(sk));
2773 sock_lock_init_class_and_name(sk, "slock-AF_INET-CIFS",
2774 &cifs_slock_key[0], "sk_lock-AF_INET-CIFS", &cifs_key[0]);
2775}
2776
2777static inline void
2778cifs_reclassify_socket6(struct socket *sock)
2779{
2780 struct sock *sk = sock->sk;
2781 BUG_ON(!sock_allow_reclassification(sk));
2782 sock_lock_init_class_and_name(sk, "slock-AF_INET6-CIFS",
2783 &cifs_slock_key[1], "sk_lock-AF_INET6-CIFS", &cifs_key[1]);
2784}
2785#else
2786static inline void
2787cifs_reclassify_socket4(struct socket *sock)
2788{
2789}
2790
2791static inline void
2792cifs_reclassify_socket6(struct socket *sock)
2793{
2794}
2795#endif
2796
2797/* See RFC1001 section 14 on representation of Netbios names */
2798static void rfc1002mangle(char *target, char *source, unsigned int length)
2799{
2800 unsigned int i, j;
2801
2802 for (i = 0, j = 0; i < (length); i++) {
2803 /* mask a nibble at a time and encode */
2804 target[j] = 'A' + (0x0F & (source[i] >> 4));
2805 target[j+1] = 'A' + (0x0F & source[i]);
2806 j += 2;
2807 }
2808
2809}
2810
2811static int
2812bind_socket(struct TCP_Server_Info *server)
2813{
2814 int rc = 0;
2815 if (server->srcaddr.ss_family != AF_UNSPEC) {
2816 /* Bind to the specified local IP address */
2817 struct socket *socket = server->ssocket;
2818 rc = socket->ops->bind(socket,
2819 (struct sockaddr *) &server->srcaddr,
2820 sizeof(server->srcaddr));
2821 if (rc < 0) {
2822 struct sockaddr_in *saddr4;
2823 struct sockaddr_in6 *saddr6;
2824 saddr4 = (struct sockaddr_in *)&server->srcaddr;
2825 saddr6 = (struct sockaddr_in6 *)&server->srcaddr;
2826 if (saddr6->sin6_family == AF_INET6)
2827 cifs_server_dbg(VFS, "Failed to bind to: %pI6c, error: %d\n",
2828 &saddr6->sin6_addr, rc);
2829 else
2830 cifs_server_dbg(VFS, "Failed to bind to: %pI4, error: %d\n",
2831 &saddr4->sin_addr.s_addr, rc);
2832 }
2833 }
2834 return rc;
2835}
2836
2837static int
2838ip_rfc1001_connect(struct TCP_Server_Info *server)
2839{
2840 int rc = 0;
2841 /*
2842 * some servers require RFC1001 sessinit before sending
2843 * negprot - BB check reconnection in case where second
2844 * sessinit is sent but no second negprot
2845 */
2846 struct rfc1002_session_packet *ses_init_buf;
2847 unsigned int req_noscope_len;
2848 struct smb_hdr *smb_buf;
2849
2850 ses_init_buf = kzalloc(sizeof(struct rfc1002_session_packet),
2851 GFP_KERNEL);
2852
2853 if (ses_init_buf) {
2854 ses_init_buf->trailer.session_req.called_len = 32;
2855
2856 if (server->server_RFC1001_name[0] != 0)
2857 rfc1002mangle(ses_init_buf->trailer.
2858 session_req.called_name,
2859 server->server_RFC1001_name,
2860 RFC1001_NAME_LEN_WITH_NULL);
2861 else
2862 rfc1002mangle(ses_init_buf->trailer.
2863 session_req.called_name,
2864 DEFAULT_CIFS_CALLED_NAME,
2865 RFC1001_NAME_LEN_WITH_NULL);
2866
2867 ses_init_buf->trailer.session_req.calling_len = 32;
2868
2869 /*
2870 * calling name ends in null (byte 16) from old smb
2871 * convention.
2872 */
2873 if (server->workstation_RFC1001_name[0] != 0)
2874 rfc1002mangle(ses_init_buf->trailer.
2875 session_req.calling_name,
2876 server->workstation_RFC1001_name,
2877 RFC1001_NAME_LEN_WITH_NULL);
2878 else
2879 rfc1002mangle(ses_init_buf->trailer.
2880 session_req.calling_name,
2881 "LINUX_CIFS_CLNT",
2882 RFC1001_NAME_LEN_WITH_NULL);
2883
2884 ses_init_buf->trailer.session_req.scope1 = 0;
2885 ses_init_buf->trailer.session_req.scope2 = 0;
2886 smb_buf = (struct smb_hdr *)ses_init_buf;
2887
2888 /* sizeof RFC1002_SESSION_REQUEST with no scopes */
2889 req_noscope_len = sizeof(struct rfc1002_session_packet) - 2;
2890
2891 /* == cpu_to_be32(0x81000044) */
2892 smb_buf->smb_buf_length =
2893 cpu_to_be32((RFC1002_SESSION_REQUEST << 24) | req_noscope_len);
2894 rc = smb_send(server, smb_buf, 0x44);
2895 kfree(ses_init_buf);
2896 /*
2897 * RFC1001 layer in at least one server
2898 * requires very short break before negprot
2899 * presumably because not expecting negprot
2900 * to follow so fast. This is a simple
2901 * solution that works without
2902 * complicating the code and causes no
2903 * significant slowing down on mount
2904 * for everyone else
2905 */
2906 usleep_range(1000, 2000);
2907 }
2908 /*
2909 * else the negprot may still work without this
2910 * even though malloc failed
2911 */
2912
2913 return rc;
2914}
2915
2916static int
2917generic_ip_connect(struct TCP_Server_Info *server)
2918{
2919 int rc = 0;
2920 __be16 sport;
2921 int slen, sfamily;
2922 struct socket *socket = server->ssocket;
2923 struct sockaddr *saddr;
2924
2925 saddr = (struct sockaddr *) &server->dstaddr;
2926
2927 if (server->dstaddr.ss_family == AF_INET6) {
2928 struct sockaddr_in6 *ipv6 = (struct sockaddr_in6 *)&server->dstaddr;
2929
2930 sport = ipv6->sin6_port;
2931 slen = sizeof(struct sockaddr_in6);
2932 sfamily = AF_INET6;
2933 cifs_dbg(FYI, "%s: connecting to [%pI6]:%d\n", __func__, &ipv6->sin6_addr,
2934 ntohs(sport));
2935 } else {
2936 struct sockaddr_in *ipv4 = (struct sockaddr_in *)&server->dstaddr;
2937
2938 sport = ipv4->sin_port;
2939 slen = sizeof(struct sockaddr_in);
2940 sfamily = AF_INET;
2941 cifs_dbg(FYI, "%s: connecting to %pI4:%d\n", __func__, &ipv4->sin_addr,
2942 ntohs(sport));
2943 }
2944
2945 if (socket == NULL) {
2946 rc = __sock_create(cifs_net_ns(server), sfamily, SOCK_STREAM,
2947 IPPROTO_TCP, &socket, 1);
2948 if (rc < 0) {
2949 cifs_server_dbg(VFS, "Error %d creating socket\n", rc);
2950 server->ssocket = NULL;
2951 return rc;
2952 }
2953
2954 /* BB other socket options to set KEEPALIVE, NODELAY? */
2955 cifs_dbg(FYI, "Socket created\n");
2956 server->ssocket = socket;
2957 socket->sk->sk_allocation = GFP_NOFS;
2958 socket->sk->sk_use_task_frag = false;
2959 if (sfamily == AF_INET6)
2960 cifs_reclassify_socket6(socket);
2961 else
2962 cifs_reclassify_socket4(socket);
2963 }
2964
2965 rc = bind_socket(server);
2966 if (rc < 0)
2967 return rc;
2968
2969 /*
2970 * Eventually check for other socket options to change from
2971 * the default. sock_setsockopt not used because it expects
2972 * user space buffer
2973 */
2974 socket->sk->sk_rcvtimeo = 7 * HZ;
2975 socket->sk->sk_sndtimeo = 5 * HZ;
2976
2977 /* make the bufsizes depend on wsize/rsize and max requests */
2978 if (server->noautotune) {
2979 if (socket->sk->sk_sndbuf < (200 * 1024))
2980 socket->sk->sk_sndbuf = 200 * 1024;
2981 if (socket->sk->sk_rcvbuf < (140 * 1024))
2982 socket->sk->sk_rcvbuf = 140 * 1024;
2983 }
2984
2985 if (server->tcp_nodelay)
2986 tcp_sock_set_nodelay(socket->sk);
2987
2988 cifs_dbg(FYI, "sndbuf %d rcvbuf %d rcvtimeo 0x%lx\n",
2989 socket->sk->sk_sndbuf,
2990 socket->sk->sk_rcvbuf, socket->sk->sk_rcvtimeo);
2991
2992 rc = socket->ops->connect(socket, saddr, slen,
2993 server->noblockcnt ? O_NONBLOCK : 0);
2994 /*
2995 * When mounting SMB root file systems, we do not want to block in
2996 * connect. Otherwise bail out and then let cifs_reconnect() perform
2997 * reconnect failover - if possible.
2998 */
2999 if (server->noblockcnt && rc == -EINPROGRESS)
3000 rc = 0;
3001 if (rc < 0) {
3002 cifs_dbg(FYI, "Error %d connecting to server\n", rc);
3003 trace_smb3_connect_err(server->hostname, server->conn_id, &server->dstaddr, rc);
3004 sock_release(socket);
3005 server->ssocket = NULL;
3006 return rc;
3007 }
3008 trace_smb3_connect_done(server->hostname, server->conn_id, &server->dstaddr);
3009 if (sport == htons(RFC1001_PORT))
3010 rc = ip_rfc1001_connect(server);
3011
3012 return rc;
3013}
3014
3015static int
3016ip_connect(struct TCP_Server_Info *server)
3017{
3018 __be16 *sport;
3019 struct sockaddr_in6 *addr6 = (struct sockaddr_in6 *)&server->dstaddr;
3020 struct sockaddr_in *addr = (struct sockaddr_in *)&server->dstaddr;
3021
3022 if (server->dstaddr.ss_family == AF_INET6)
3023 sport = &addr6->sin6_port;
3024 else
3025 sport = &addr->sin_port;
3026
3027 if (*sport == 0) {
3028 int rc;
3029
3030 /* try with 445 port at first */
3031 *sport = htons(CIFS_PORT);
3032
3033 rc = generic_ip_connect(server);
3034 if (rc >= 0)
3035 return rc;
3036
3037 /* if it failed, try with 139 port */
3038 *sport = htons(RFC1001_PORT);
3039 }
3040
3041 return generic_ip_connect(server);
3042}
3043
3044#ifdef CONFIG_CIFS_ALLOW_INSECURE_LEGACY
3045void reset_cifs_unix_caps(unsigned int xid, struct cifs_tcon *tcon,
3046 struct cifs_sb_info *cifs_sb, struct smb3_fs_context *ctx)
3047{
3048 /*
3049 * If we are reconnecting then should we check to see if
3050 * any requested capabilities changed locally e.g. via
3051 * remount but we can not do much about it here
3052 * if they have (even if we could detect it by the following)
3053 * Perhaps we could add a backpointer to array of sb from tcon
3054 * or if we change to make all sb to same share the same
3055 * sb as NFS - then we only have one backpointer to sb.
3056 * What if we wanted to mount the server share twice once with
3057 * and once without posixacls or posix paths?
3058 */
3059 __u64 saved_cap = le64_to_cpu(tcon->fsUnixInfo.Capability);
3060
3061 if (ctx && ctx->no_linux_ext) {
3062 tcon->fsUnixInfo.Capability = 0;
3063 tcon->unix_ext = 0; /* Unix Extensions disabled */
3064 cifs_dbg(FYI, "Linux protocol extensions disabled\n");
3065 return;
3066 } else if (ctx)
3067 tcon->unix_ext = 1; /* Unix Extensions supported */
3068
3069 if (!tcon->unix_ext) {
3070 cifs_dbg(FYI, "Unix extensions disabled so not set on reconnect\n");
3071 return;
3072 }
3073
3074 if (!CIFSSMBQFSUnixInfo(xid, tcon)) {
3075 __u64 cap = le64_to_cpu(tcon->fsUnixInfo.Capability);
3076 cifs_dbg(FYI, "unix caps which server supports %lld\n", cap);
3077 /*
3078 * check for reconnect case in which we do not
3079 * want to change the mount behavior if we can avoid it
3080 */
3081 if (ctx == NULL) {
3082 /*
3083 * turn off POSIX ACL and PATHNAMES if not set
3084 * originally at mount time
3085 */
3086 if ((saved_cap & CIFS_UNIX_POSIX_ACL_CAP) == 0)
3087 cap &= ~CIFS_UNIX_POSIX_ACL_CAP;
3088 if ((saved_cap & CIFS_UNIX_POSIX_PATHNAMES_CAP) == 0) {
3089 if (cap & CIFS_UNIX_POSIX_PATHNAMES_CAP)
3090 cifs_dbg(VFS, "POSIXPATH support change\n");
3091 cap &= ~CIFS_UNIX_POSIX_PATHNAMES_CAP;
3092 } else if ((cap & CIFS_UNIX_POSIX_PATHNAMES_CAP) == 0) {
3093 cifs_dbg(VFS, "possible reconnect error\n");
3094 cifs_dbg(VFS, "server disabled POSIX path support\n");
3095 }
3096 }
3097
3098 if (cap & CIFS_UNIX_TRANSPORT_ENCRYPTION_MANDATORY_CAP)
3099 cifs_dbg(VFS, "per-share encryption not supported yet\n");
3100
3101 cap &= CIFS_UNIX_CAP_MASK;
3102 if (ctx && ctx->no_psx_acl)
3103 cap &= ~CIFS_UNIX_POSIX_ACL_CAP;
3104 else if (CIFS_UNIX_POSIX_ACL_CAP & cap) {
3105 cifs_dbg(FYI, "negotiated posix acl support\n");
3106 if (cifs_sb)
3107 cifs_sb->mnt_cifs_flags |=
3108 CIFS_MOUNT_POSIXACL;
3109 }
3110
3111 if (ctx && ctx->posix_paths == 0)
3112 cap &= ~CIFS_UNIX_POSIX_PATHNAMES_CAP;
3113 else if (cap & CIFS_UNIX_POSIX_PATHNAMES_CAP) {
3114 cifs_dbg(FYI, "negotiate posix pathnames\n");
3115 if (cifs_sb)
3116 cifs_sb->mnt_cifs_flags |=
3117 CIFS_MOUNT_POSIX_PATHS;
3118 }
3119
3120 cifs_dbg(FYI, "Negotiate caps 0x%x\n", (int)cap);
3121#ifdef CONFIG_CIFS_DEBUG2
3122 if (cap & CIFS_UNIX_FCNTL_CAP)
3123 cifs_dbg(FYI, "FCNTL cap\n");
3124 if (cap & CIFS_UNIX_EXTATTR_CAP)
3125 cifs_dbg(FYI, "EXTATTR cap\n");
3126 if (cap & CIFS_UNIX_POSIX_PATHNAMES_CAP)
3127 cifs_dbg(FYI, "POSIX path cap\n");
3128 if (cap & CIFS_UNIX_XATTR_CAP)
3129 cifs_dbg(FYI, "XATTR cap\n");
3130 if (cap & CIFS_UNIX_POSIX_ACL_CAP)
3131 cifs_dbg(FYI, "POSIX ACL cap\n");
3132 if (cap & CIFS_UNIX_LARGE_READ_CAP)
3133 cifs_dbg(FYI, "very large read cap\n");
3134 if (cap & CIFS_UNIX_LARGE_WRITE_CAP)
3135 cifs_dbg(FYI, "very large write cap\n");
3136 if (cap & CIFS_UNIX_TRANSPORT_ENCRYPTION_CAP)
3137 cifs_dbg(FYI, "transport encryption cap\n");
3138 if (cap & CIFS_UNIX_TRANSPORT_ENCRYPTION_MANDATORY_CAP)
3139 cifs_dbg(FYI, "mandatory transport encryption cap\n");
3140#endif /* CIFS_DEBUG2 */
3141 if (CIFSSMBSetFSUnixInfo(xid, tcon, cap)) {
3142 if (ctx == NULL)
3143 cifs_dbg(FYI, "resetting capabilities failed\n");
3144 else
3145 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");
3146
3147 }
3148 }
3149}
3150#endif /* CONFIG_CIFS_ALLOW_INSECURE_LEGACY */
3151
3152int cifs_setup_cifs_sb(struct cifs_sb_info *cifs_sb)
3153{
3154 struct smb3_fs_context *ctx = cifs_sb->ctx;
3155
3156 INIT_DELAYED_WORK(&cifs_sb->prune_tlinks, cifs_prune_tlinks);
3157
3158 spin_lock_init(&cifs_sb->tlink_tree_lock);
3159 cifs_sb->tlink_tree = RB_ROOT;
3160
3161 cifs_dbg(FYI, "file mode: %04ho dir mode: %04ho\n",
3162 ctx->file_mode, ctx->dir_mode);
3163
3164 /* this is needed for ASCII cp to Unicode converts */
3165 if (ctx->iocharset == NULL) {
3166 /* load_nls_default cannot return null */
3167 cifs_sb->local_nls = load_nls_default();
3168 } else {
3169 cifs_sb->local_nls = load_nls(ctx->iocharset);
3170 if (cifs_sb->local_nls == NULL) {
3171 cifs_dbg(VFS, "CIFS mount error: iocharset %s not found\n",
3172 ctx->iocharset);
3173 return -ELIBACC;
3174 }
3175 }
3176 ctx->local_nls = cifs_sb->local_nls;
3177
3178 smb3_update_mnt_flags(cifs_sb);
3179
3180 if (ctx->direct_io)
3181 cifs_dbg(FYI, "mounting share using direct i/o\n");
3182 if (ctx->cache_ro) {
3183 cifs_dbg(VFS, "mounting share with read only caching. Ensure that the share will not be modified while in use.\n");
3184 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_RO_CACHE;
3185 } else if (ctx->cache_rw) {
3186 cifs_dbg(VFS, "mounting share in single client RW caching mode. Ensure that no other systems will be accessing the share.\n");
3187 cifs_sb->mnt_cifs_flags |= (CIFS_MOUNT_RO_CACHE |
3188 CIFS_MOUNT_RW_CACHE);
3189 }
3190
3191 if ((ctx->cifs_acl) && (ctx->dynperm))
3192 cifs_dbg(VFS, "mount option dynperm ignored if cifsacl mount option supported\n");
3193
3194 if (ctx->prepath) {
3195 cifs_sb->prepath = kstrdup(ctx->prepath, GFP_KERNEL);
3196 if (cifs_sb->prepath == NULL)
3197 return -ENOMEM;
3198 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_USE_PREFIX_PATH;
3199 }
3200
3201 return 0;
3202}
3203
3204/* Release all succeed connections */
3205void cifs_mount_put_conns(struct cifs_mount_ctx *mnt_ctx)
3206{
3207 int rc = 0;
3208
3209 if (mnt_ctx->tcon)
3210 cifs_put_tcon(mnt_ctx->tcon);
3211 else if (mnt_ctx->ses)
3212 cifs_put_smb_ses(mnt_ctx->ses);
3213 else if (mnt_ctx->server)
3214 cifs_put_tcp_session(mnt_ctx->server, 0);
3215 mnt_ctx->cifs_sb->mnt_cifs_flags &= ~CIFS_MOUNT_POSIX_PATHS;
3216 free_xid(mnt_ctx->xid);
3217}
3218
3219int cifs_mount_get_session(struct cifs_mount_ctx *mnt_ctx)
3220{
3221 struct TCP_Server_Info *server = NULL;
3222 struct smb3_fs_context *ctx;
3223 struct cifs_ses *ses = NULL;
3224 unsigned int xid;
3225 int rc = 0;
3226
3227 xid = get_xid();
3228
3229 if (WARN_ON_ONCE(!mnt_ctx || !mnt_ctx->fs_ctx)) {
3230 rc = -EINVAL;
3231 goto out;
3232 }
3233 ctx = mnt_ctx->fs_ctx;
3234
3235 /* get a reference to a tcp session */
3236 server = cifs_get_tcp_session(ctx, NULL);
3237 if (IS_ERR(server)) {
3238 rc = PTR_ERR(server);
3239 server = NULL;
3240 goto out;
3241 }
3242
3243 /* get a reference to a SMB session */
3244 ses = cifs_get_smb_ses(server, ctx);
3245 if (IS_ERR(ses)) {
3246 rc = PTR_ERR(ses);
3247 ses = NULL;
3248 goto out;
3249 }
3250
3251 if ((ctx->persistent == true) && (!(ses->server->capabilities &
3252 SMB2_GLOBAL_CAP_PERSISTENT_HANDLES))) {
3253 cifs_server_dbg(VFS, "persistent handles not supported by server\n");
3254 rc = -EOPNOTSUPP;
3255 }
3256
3257out:
3258 mnt_ctx->xid = xid;
3259 mnt_ctx->server = server;
3260 mnt_ctx->ses = ses;
3261 mnt_ctx->tcon = NULL;
3262
3263 return rc;
3264}
3265
3266int cifs_mount_get_tcon(struct cifs_mount_ctx *mnt_ctx)
3267{
3268 struct TCP_Server_Info *server;
3269 struct cifs_sb_info *cifs_sb;
3270 struct smb3_fs_context *ctx;
3271 struct cifs_tcon *tcon = NULL;
3272 int rc = 0;
3273
3274 if (WARN_ON_ONCE(!mnt_ctx || !mnt_ctx->server || !mnt_ctx->ses || !mnt_ctx->fs_ctx ||
3275 !mnt_ctx->cifs_sb)) {
3276 rc = -EINVAL;
3277 goto out;
3278 }
3279 server = mnt_ctx->server;
3280 ctx = mnt_ctx->fs_ctx;
3281 cifs_sb = mnt_ctx->cifs_sb;
3282
3283 /* search for existing tcon to this server share */
3284 tcon = cifs_get_tcon(mnt_ctx->ses, ctx);
3285 if (IS_ERR(tcon)) {
3286 rc = PTR_ERR(tcon);
3287 tcon = NULL;
3288 goto out;
3289 }
3290
3291 /* if new SMB3.11 POSIX extensions are supported do not remap / and \ */
3292 if (tcon->posix_extensions)
3293 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_POSIX_PATHS;
3294
3295#ifdef CONFIG_CIFS_ALLOW_INSECURE_LEGACY
3296 /* tell server which Unix caps we support */
3297 if (cap_unix(tcon->ses)) {
3298 /*
3299 * reset of caps checks mount to see if unix extensions disabled
3300 * for just this mount.
3301 */
3302 reset_cifs_unix_caps(mnt_ctx->xid, tcon, cifs_sb, ctx);
3303 spin_lock(&tcon->ses->server->srv_lock);
3304 if ((tcon->ses->server->tcpStatus == CifsNeedReconnect) &&
3305 (le64_to_cpu(tcon->fsUnixInfo.Capability) &
3306 CIFS_UNIX_TRANSPORT_ENCRYPTION_MANDATORY_CAP)) {
3307 spin_unlock(&tcon->ses->server->srv_lock);
3308 rc = -EACCES;
3309 goto out;
3310 }
3311 spin_unlock(&tcon->ses->server->srv_lock);
3312 } else
3313#endif /* CONFIG_CIFS_ALLOW_INSECURE_LEGACY */
3314 tcon->unix_ext = 0; /* server does not support them */
3315
3316 /* do not care if a following call succeed - informational */
3317 if (!tcon->pipe && server->ops->qfs_tcon) {
3318 server->ops->qfs_tcon(mnt_ctx->xid, tcon, cifs_sb);
3319 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_RO_CACHE) {
3320 if (tcon->fsDevInfo.DeviceCharacteristics &
3321 cpu_to_le32(FILE_READ_ONLY_DEVICE))
3322 cifs_dbg(VFS, "mounted to read only share\n");
3323 else if ((cifs_sb->mnt_cifs_flags &
3324 CIFS_MOUNT_RW_CACHE) == 0)
3325 cifs_dbg(VFS, "read only mount of RW share\n");
3326 /* no need to log a RW mount of a typical RW share */
3327 }
3328 }
3329
3330 /*
3331 * Clamp the rsize/wsize mount arguments if they are too big for the server
3332 * and set the rsize/wsize to the negotiated values if not passed in by
3333 * the user on mount
3334 */
3335 if ((cifs_sb->ctx->wsize == 0) ||
3336 (cifs_sb->ctx->wsize > server->ops->negotiate_wsize(tcon, ctx)))
3337 cifs_sb->ctx->wsize = server->ops->negotiate_wsize(tcon, ctx);
3338 if ((cifs_sb->ctx->rsize == 0) ||
3339 (cifs_sb->ctx->rsize > server->ops->negotiate_rsize(tcon, ctx)))
3340 cifs_sb->ctx->rsize = server->ops->negotiate_rsize(tcon, ctx);
3341
3342 /*
3343 * The cookie is initialized from volume info returned above.
3344 * Inside cifs_fscache_get_super_cookie it checks
3345 * that we do not get super cookie twice.
3346 */
3347 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_FSCACHE)
3348 cifs_fscache_get_super_cookie(tcon);
3349
3350out:
3351 mnt_ctx->tcon = tcon;
3352 return rc;
3353}
3354
3355static int mount_setup_tlink(struct cifs_sb_info *cifs_sb, struct cifs_ses *ses,
3356 struct cifs_tcon *tcon)
3357{
3358 struct tcon_link *tlink;
3359
3360 /* hang the tcon off of the superblock */
3361 tlink = kzalloc(sizeof(*tlink), GFP_KERNEL);
3362 if (tlink == NULL)
3363 return -ENOMEM;
3364
3365 tlink->tl_uid = ses->linux_uid;
3366 tlink->tl_tcon = tcon;
3367 tlink->tl_time = jiffies;
3368 set_bit(TCON_LINK_MASTER, &tlink->tl_flags);
3369 set_bit(TCON_LINK_IN_TREE, &tlink->tl_flags);
3370
3371 cifs_sb->master_tlink = tlink;
3372 spin_lock(&cifs_sb->tlink_tree_lock);
3373 tlink_rb_insert(&cifs_sb->tlink_tree, tlink);
3374 spin_unlock(&cifs_sb->tlink_tree_lock);
3375
3376 queue_delayed_work(cifsiod_wq, &cifs_sb->prune_tlinks,
3377 TLINK_IDLE_EXPIRE);
3378 return 0;
3379}
3380
3381static int
3382cifs_are_all_path_components_accessible(struct TCP_Server_Info *server,
3383 unsigned int xid,
3384 struct cifs_tcon *tcon,
3385 struct cifs_sb_info *cifs_sb,
3386 char *full_path,
3387 int added_treename)
3388{
3389 int rc;
3390 char *s;
3391 char sep, tmp;
3392 int skip = added_treename ? 1 : 0;
3393
3394 sep = CIFS_DIR_SEP(cifs_sb);
3395 s = full_path;
3396
3397 rc = server->ops->is_path_accessible(xid, tcon, cifs_sb, "");
3398 while (rc == 0) {
3399 /* skip separators */
3400 while (*s == sep)
3401 s++;
3402 if (!*s)
3403 break;
3404 /* next separator */
3405 while (*s && *s != sep)
3406 s++;
3407 /*
3408 * if the treename is added, we then have to skip the first
3409 * part within the separators
3410 */
3411 if (skip) {
3412 skip = 0;
3413 continue;
3414 }
3415 /*
3416 * temporarily null-terminate the path at the end of
3417 * the current component
3418 */
3419 tmp = *s;
3420 *s = 0;
3421 rc = server->ops->is_path_accessible(xid, tcon, cifs_sb,
3422 full_path);
3423 *s = tmp;
3424 }
3425 return rc;
3426}
3427
3428/*
3429 * Check if path is remote (i.e. a DFS share).
3430 *
3431 * Return -EREMOTE if it is, otherwise 0 or -errno.
3432 */
3433int cifs_is_path_remote(struct cifs_mount_ctx *mnt_ctx)
3434{
3435 int rc;
3436 struct cifs_sb_info *cifs_sb = mnt_ctx->cifs_sb;
3437 struct TCP_Server_Info *server = mnt_ctx->server;
3438 unsigned int xid = mnt_ctx->xid;
3439 struct cifs_tcon *tcon = mnt_ctx->tcon;
3440 struct smb3_fs_context *ctx = mnt_ctx->fs_ctx;
3441 char *full_path;
3442
3443 if (!server->ops->is_path_accessible)
3444 return -EOPNOTSUPP;
3445
3446 /*
3447 * cifs_build_path_to_root works only when we have a valid tcon
3448 */
3449 full_path = cifs_build_path_to_root(ctx, cifs_sb, tcon,
3450 tcon->Flags & SMB_SHARE_IS_IN_DFS);
3451 if (full_path == NULL)
3452 return -ENOMEM;
3453
3454 cifs_dbg(FYI, "%s: full_path: %s\n", __func__, full_path);
3455
3456 rc = server->ops->is_path_accessible(xid, tcon, cifs_sb,
3457 full_path);
3458 if (rc != 0 && rc != -EREMOTE)
3459 goto out;
3460
3461 if (rc != -EREMOTE) {
3462 rc = cifs_are_all_path_components_accessible(server, xid, tcon,
3463 cifs_sb, full_path, tcon->Flags & SMB_SHARE_IS_IN_DFS);
3464 if (rc != 0) {
3465 cifs_server_dbg(VFS, "cannot query dirs between root and final path, enabling CIFS_MOUNT_USE_PREFIX_PATH\n");
3466 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_USE_PREFIX_PATH;
3467 rc = 0;
3468 }
3469 }
3470
3471out:
3472 kfree(full_path);
3473 return rc;
3474}
3475
3476#ifdef CONFIG_CIFS_DFS_UPCALL
3477int cifs_mount(struct cifs_sb_info *cifs_sb, struct smb3_fs_context *ctx)
3478{
3479 struct cifs_mount_ctx mnt_ctx = { .cifs_sb = cifs_sb, .fs_ctx = ctx, };
3480 bool isdfs;
3481 int rc;
3482
3483 uuid_gen(&mnt_ctx.mount_id);
3484 rc = dfs_mount_share(&mnt_ctx, &isdfs);
3485 if (rc)
3486 goto error;
3487 if (!isdfs)
3488 goto out;
3489
3490 /*
3491 * After reconnecting to a different server, unique ids won't match anymore, so we disable
3492 * serverino. This prevents dentry revalidation to think the dentry are stale (ESTALE).
3493 */
3494 cifs_autodisable_serverino(cifs_sb);
3495 /*
3496 * Force the use of prefix path to support failover on DFS paths that resolve to targets
3497 * that have different prefix paths.
3498 */
3499 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_USE_PREFIX_PATH;
3500 kfree(cifs_sb->prepath);
3501 cifs_sb->prepath = ctx->prepath;
3502 ctx->prepath = NULL;
3503 uuid_copy(&cifs_sb->dfs_mount_id, &mnt_ctx.mount_id);
3504
3505out:
3506 cifs_try_adding_channels(cifs_sb, mnt_ctx.ses);
3507 rc = mount_setup_tlink(cifs_sb, mnt_ctx.ses, mnt_ctx.tcon);
3508 if (rc)
3509 goto error;
3510
3511 free_xid(mnt_ctx.xid);
3512 return rc;
3513
3514error:
3515 dfs_cache_put_refsrv_sessions(&mnt_ctx.mount_id);
3516 kfree(mnt_ctx.origin_fullpath);
3517 kfree(mnt_ctx.leaf_fullpath);
3518 cifs_mount_put_conns(&mnt_ctx);
3519 return rc;
3520}
3521#else
3522int cifs_mount(struct cifs_sb_info *cifs_sb, struct smb3_fs_context *ctx)
3523{
3524 int rc = 0;
3525 struct cifs_mount_ctx mnt_ctx = { .cifs_sb = cifs_sb, .fs_ctx = ctx, };
3526
3527 rc = cifs_mount_get_session(&mnt_ctx);
3528 if (rc)
3529 goto error;
3530
3531 rc = cifs_mount_get_tcon(&mnt_ctx);
3532 if (rc)
3533 goto error;
3534
3535 rc = cifs_is_path_remote(&mnt_ctx);
3536 if (rc == -EREMOTE)
3537 rc = -EOPNOTSUPP;
3538 if (rc)
3539 goto error;
3540
3541 rc = mount_setup_tlink(cifs_sb, mnt_ctx.ses, mnt_ctx.tcon);
3542 if (rc)
3543 goto error;
3544
3545 free_xid(mnt_ctx.xid);
3546 return rc;
3547
3548error:
3549 cifs_mount_put_conns(&mnt_ctx);
3550 return rc;
3551}
3552#endif
3553
3554/*
3555 * Issue a TREE_CONNECT request.
3556 */
3557int
3558CIFSTCon(const unsigned int xid, struct cifs_ses *ses,
3559 const char *tree, struct cifs_tcon *tcon,
3560 const struct nls_table *nls_codepage)
3561{
3562 struct smb_hdr *smb_buffer;
3563 struct smb_hdr *smb_buffer_response;
3564 TCONX_REQ *pSMB;
3565 TCONX_RSP *pSMBr;
3566 unsigned char *bcc_ptr;
3567 int rc = 0;
3568 int length;
3569 __u16 bytes_left, count;
3570
3571 if (ses == NULL)
3572 return -EIO;
3573
3574 smb_buffer = cifs_buf_get();
3575 if (smb_buffer == NULL)
3576 return -ENOMEM;
3577
3578 smb_buffer_response = smb_buffer;
3579
3580 header_assemble(smb_buffer, SMB_COM_TREE_CONNECT_ANDX,
3581 NULL /*no tid */ , 4 /*wct */ );
3582
3583 smb_buffer->Mid = get_next_mid(ses->server);
3584 smb_buffer->Uid = ses->Suid;
3585 pSMB = (TCONX_REQ *) smb_buffer;
3586 pSMBr = (TCONX_RSP *) smb_buffer_response;
3587
3588 pSMB->AndXCommand = 0xFF;
3589 pSMB->Flags = cpu_to_le16(TCON_EXTENDED_SECINFO);
3590 bcc_ptr = &pSMB->Password[0];
3591
3592 pSMB->PasswordLength = cpu_to_le16(1); /* minimum */
3593 *bcc_ptr = 0; /* password is null byte */
3594 bcc_ptr++; /* skip password */
3595 /* already aligned so no need to do it below */
3596
3597 if (ses->server->sign)
3598 smb_buffer->Flags2 |= SMBFLG2_SECURITY_SIGNATURE;
3599
3600 if (ses->capabilities & CAP_STATUS32) {
3601 smb_buffer->Flags2 |= SMBFLG2_ERR_STATUS;
3602 }
3603 if (ses->capabilities & CAP_DFS) {
3604 smb_buffer->Flags2 |= SMBFLG2_DFS;
3605 }
3606 if (ses->capabilities & CAP_UNICODE) {
3607 smb_buffer->Flags2 |= SMBFLG2_UNICODE;
3608 length =
3609 cifs_strtoUTF16((__le16 *) bcc_ptr, tree,
3610 6 /* max utf8 char length in bytes */ *
3611 (/* server len*/ + 256 /* share len */), nls_codepage);
3612 bcc_ptr += 2 * length; /* convert num 16 bit words to bytes */
3613 bcc_ptr += 2; /* skip trailing null */
3614 } else { /* ASCII */
3615 strcpy(bcc_ptr, tree);
3616 bcc_ptr += strlen(tree) + 1;
3617 }
3618 strcpy(bcc_ptr, "?????");
3619 bcc_ptr += strlen("?????");
3620 bcc_ptr += 1;
3621 count = bcc_ptr - &pSMB->Password[0];
3622 be32_add_cpu(&pSMB->hdr.smb_buf_length, count);
3623 pSMB->ByteCount = cpu_to_le16(count);
3624
3625 rc = SendReceive(xid, ses, smb_buffer, smb_buffer_response, &length,
3626 0);
3627
3628 /* above now done in SendReceive */
3629 if (rc == 0) {
3630 bool is_unicode;
3631
3632 tcon->tid = smb_buffer_response->Tid;
3633 bcc_ptr = pByteArea(smb_buffer_response);
3634 bytes_left = get_bcc(smb_buffer_response);
3635 length = strnlen(bcc_ptr, bytes_left - 2);
3636 if (smb_buffer->Flags2 & SMBFLG2_UNICODE)
3637 is_unicode = true;
3638 else
3639 is_unicode = false;
3640
3641
3642 /* skip service field (NB: this field is always ASCII) */
3643 if (length == 3) {
3644 if ((bcc_ptr[0] == 'I') && (bcc_ptr[1] == 'P') &&
3645 (bcc_ptr[2] == 'C')) {
3646 cifs_dbg(FYI, "IPC connection\n");
3647 tcon->ipc = true;
3648 tcon->pipe = true;
3649 }
3650 } else if (length == 2) {
3651 if ((bcc_ptr[0] == 'A') && (bcc_ptr[1] == ':')) {
3652 /* the most common case */
3653 cifs_dbg(FYI, "disk share connection\n");
3654 }
3655 }
3656 bcc_ptr += length + 1;
3657 bytes_left -= (length + 1);
3658 strscpy(tcon->tree_name, tree, sizeof(tcon->tree_name));
3659
3660 /* mostly informational -- no need to fail on error here */
3661 kfree(tcon->nativeFileSystem);
3662 tcon->nativeFileSystem = cifs_strndup_from_utf16(bcc_ptr,
3663 bytes_left, is_unicode,
3664 nls_codepage);
3665
3666 cifs_dbg(FYI, "nativeFileSystem=%s\n", tcon->nativeFileSystem);
3667
3668 if ((smb_buffer_response->WordCount == 3) ||
3669 (smb_buffer_response->WordCount == 7))
3670 /* field is in same location */
3671 tcon->Flags = le16_to_cpu(pSMBr->OptionalSupport);
3672 else
3673 tcon->Flags = 0;
3674 cifs_dbg(FYI, "Tcon flags: 0x%x\n", tcon->Flags);
3675 }
3676
3677 cifs_buf_release(smb_buffer);
3678 return rc;
3679}
3680
3681static void delayed_free(struct rcu_head *p)
3682{
3683 struct cifs_sb_info *cifs_sb = container_of(p, struct cifs_sb_info, rcu);
3684
3685 unload_nls(cifs_sb->local_nls);
3686 smb3_cleanup_fs_context(cifs_sb->ctx);
3687 kfree(cifs_sb);
3688}
3689
3690void
3691cifs_umount(struct cifs_sb_info *cifs_sb)
3692{
3693 struct rb_root *root = &cifs_sb->tlink_tree;
3694 struct rb_node *node;
3695 struct tcon_link *tlink;
3696
3697 cancel_delayed_work_sync(&cifs_sb->prune_tlinks);
3698
3699 spin_lock(&cifs_sb->tlink_tree_lock);
3700 while ((node = rb_first(root))) {
3701 tlink = rb_entry(node, struct tcon_link, tl_rbnode);
3702 cifs_get_tlink(tlink);
3703 clear_bit(TCON_LINK_IN_TREE, &tlink->tl_flags);
3704 rb_erase(node, root);
3705
3706 spin_unlock(&cifs_sb->tlink_tree_lock);
3707 cifs_put_tlink(tlink);
3708 spin_lock(&cifs_sb->tlink_tree_lock);
3709 }
3710 spin_unlock(&cifs_sb->tlink_tree_lock);
3711
3712 kfree(cifs_sb->prepath);
3713#ifdef CONFIG_CIFS_DFS_UPCALL
3714 dfs_cache_put_refsrv_sessions(&cifs_sb->dfs_mount_id);
3715#endif
3716 call_rcu(&cifs_sb->rcu, delayed_free);
3717}
3718
3719int
3720cifs_negotiate_protocol(const unsigned int xid, struct cifs_ses *ses,
3721 struct TCP_Server_Info *server)
3722{
3723 int rc = 0;
3724
3725 if (!server->ops->need_neg || !server->ops->negotiate)
3726 return -ENOSYS;
3727
3728 /* only send once per connect */
3729 spin_lock(&server->srv_lock);
3730 if (!server->ops->need_neg(server) ||
3731 server->tcpStatus != CifsNeedNegotiate) {
3732 spin_unlock(&server->srv_lock);
3733 return 0;
3734 }
3735 server->tcpStatus = CifsInNegotiate;
3736 spin_unlock(&server->srv_lock);
3737
3738 rc = server->ops->negotiate(xid, ses, server);
3739 if (rc == 0) {
3740 spin_lock(&server->srv_lock);
3741 if (server->tcpStatus == CifsInNegotiate)
3742 server->tcpStatus = CifsGood;
3743 else
3744 rc = -EHOSTDOWN;
3745 spin_unlock(&server->srv_lock);
3746 } else {
3747 spin_lock(&server->srv_lock);
3748 if (server->tcpStatus == CifsInNegotiate)
3749 server->tcpStatus = CifsNeedNegotiate;
3750 spin_unlock(&server->srv_lock);
3751 }
3752
3753 return rc;
3754}
3755
3756int
3757cifs_setup_session(const unsigned int xid, struct cifs_ses *ses,
3758 struct TCP_Server_Info *server,
3759 struct nls_table *nls_info)
3760{
3761 int rc = -ENOSYS;
3762 struct sockaddr_in6 *addr6 = (struct sockaddr_in6 *)&server->dstaddr;
3763 struct sockaddr_in *addr = (struct sockaddr_in *)&server->dstaddr;
3764 bool is_binding = false;
3765
3766 spin_lock(&ses->ses_lock);
3767 if (server->dstaddr.ss_family == AF_INET6)
3768 scnprintf(ses->ip_addr, sizeof(ses->ip_addr), "%pI6", &addr6->sin6_addr);
3769 else
3770 scnprintf(ses->ip_addr, sizeof(ses->ip_addr), "%pI4", &addr->sin_addr);
3771
3772 if (ses->ses_status != SES_GOOD &&
3773 ses->ses_status != SES_NEW &&
3774 ses->ses_status != SES_NEED_RECON) {
3775 spin_unlock(&ses->ses_lock);
3776 return 0;
3777 }
3778
3779 /* only send once per connect */
3780 spin_lock(&ses->chan_lock);
3781 if (CIFS_ALL_CHANS_GOOD(ses) ||
3782 cifs_chan_in_reconnect(ses, server)) {
3783 spin_unlock(&ses->chan_lock);
3784 spin_unlock(&ses->ses_lock);
3785 return 0;
3786 }
3787 is_binding = !CIFS_ALL_CHANS_NEED_RECONNECT(ses);
3788 cifs_chan_set_in_reconnect(ses, server);
3789 spin_unlock(&ses->chan_lock);
3790
3791 if (!is_binding)
3792 ses->ses_status = SES_IN_SETUP;
3793 spin_unlock(&ses->ses_lock);
3794
3795 if (!is_binding) {
3796 ses->capabilities = server->capabilities;
3797 if (!linuxExtEnabled)
3798 ses->capabilities &= (~server->vals->cap_unix);
3799
3800 if (ses->auth_key.response) {
3801 cifs_dbg(FYI, "Free previous auth_key.response = %p\n",
3802 ses->auth_key.response);
3803 kfree_sensitive(ses->auth_key.response);
3804 ses->auth_key.response = NULL;
3805 ses->auth_key.len = 0;
3806 }
3807 }
3808
3809 cifs_dbg(FYI, "Security Mode: 0x%x Capabilities: 0x%x TimeAdjust: %d\n",
3810 server->sec_mode, server->capabilities, server->timeAdj);
3811
3812 if (server->ops->sess_setup)
3813 rc = server->ops->sess_setup(xid, ses, server, nls_info);
3814
3815 if (rc) {
3816 cifs_server_dbg(VFS, "Send error in SessSetup = %d\n", rc);
3817 spin_lock(&ses->ses_lock);
3818 if (ses->ses_status == SES_IN_SETUP)
3819 ses->ses_status = SES_NEED_RECON;
3820 spin_lock(&ses->chan_lock);
3821 cifs_chan_clear_in_reconnect(ses, server);
3822 spin_unlock(&ses->chan_lock);
3823 spin_unlock(&ses->ses_lock);
3824 } else {
3825 spin_lock(&ses->ses_lock);
3826 if (ses->ses_status == SES_IN_SETUP)
3827 ses->ses_status = SES_GOOD;
3828 spin_lock(&ses->chan_lock);
3829 cifs_chan_clear_in_reconnect(ses, server);
3830 cifs_chan_clear_need_reconnect(ses, server);
3831 spin_unlock(&ses->chan_lock);
3832 spin_unlock(&ses->ses_lock);
3833 }
3834
3835 return rc;
3836}
3837
3838static int
3839cifs_set_vol_auth(struct smb3_fs_context *ctx, struct cifs_ses *ses)
3840{
3841 ctx->sectype = ses->sectype;
3842
3843 /* krb5 is special, since we don't need username or pw */
3844 if (ctx->sectype == Kerberos)
3845 return 0;
3846
3847 return cifs_set_cifscreds(ctx, ses);
3848}
3849
3850static struct cifs_tcon *
3851cifs_construct_tcon(struct cifs_sb_info *cifs_sb, kuid_t fsuid)
3852{
3853 int rc;
3854 struct cifs_tcon *master_tcon = cifs_sb_master_tcon(cifs_sb);
3855 struct cifs_ses *ses;
3856 struct cifs_tcon *tcon = NULL;
3857 struct smb3_fs_context *ctx;
3858
3859 ctx = kzalloc(sizeof(*ctx), GFP_KERNEL);
3860 if (ctx == NULL)
3861 return ERR_PTR(-ENOMEM);
3862
3863 ctx->local_nls = cifs_sb->local_nls;
3864 ctx->linux_uid = fsuid;
3865 ctx->cred_uid = fsuid;
3866 ctx->UNC = master_tcon->tree_name;
3867 ctx->retry = master_tcon->retry;
3868 ctx->nocase = master_tcon->nocase;
3869 ctx->nohandlecache = master_tcon->nohandlecache;
3870 ctx->local_lease = master_tcon->local_lease;
3871 ctx->no_lease = master_tcon->no_lease;
3872 ctx->resilient = master_tcon->use_resilient;
3873 ctx->persistent = master_tcon->use_persistent;
3874 ctx->handle_timeout = master_tcon->handle_timeout;
3875 ctx->no_linux_ext = !master_tcon->unix_ext;
3876 ctx->linux_ext = master_tcon->posix_extensions;
3877 ctx->sectype = master_tcon->ses->sectype;
3878 ctx->sign = master_tcon->ses->sign;
3879 ctx->seal = master_tcon->seal;
3880 ctx->witness = master_tcon->use_witness;
3881
3882 rc = cifs_set_vol_auth(ctx, master_tcon->ses);
3883 if (rc) {
3884 tcon = ERR_PTR(rc);
3885 goto out;
3886 }
3887
3888 /* get a reference for the same TCP session */
3889 spin_lock(&cifs_tcp_ses_lock);
3890 ++master_tcon->ses->server->srv_count;
3891 spin_unlock(&cifs_tcp_ses_lock);
3892
3893 ses = cifs_get_smb_ses(master_tcon->ses->server, ctx);
3894 if (IS_ERR(ses)) {
3895 tcon = (struct cifs_tcon *)ses;
3896 cifs_put_tcp_session(master_tcon->ses->server, 0);
3897 goto out;
3898 }
3899
3900 tcon = cifs_get_tcon(ses, ctx);
3901 if (IS_ERR(tcon)) {
3902 cifs_put_smb_ses(ses);
3903 goto out;
3904 }
3905
3906#ifdef CONFIG_CIFS_ALLOW_INSECURE_LEGACY
3907 if (cap_unix(ses))
3908 reset_cifs_unix_caps(0, tcon, NULL, ctx);
3909#endif /* CONFIG_CIFS_ALLOW_INSECURE_LEGACY */
3910
3911out:
3912 kfree(ctx->username);
3913 kfree_sensitive(ctx->password);
3914 kfree(ctx);
3915
3916 return tcon;
3917}
3918
3919struct cifs_tcon *
3920cifs_sb_master_tcon(struct cifs_sb_info *cifs_sb)
3921{
3922 return tlink_tcon(cifs_sb_master_tlink(cifs_sb));
3923}
3924
3925/* find and return a tlink with given uid */
3926static struct tcon_link *
3927tlink_rb_search(struct rb_root *root, kuid_t uid)
3928{
3929 struct rb_node *node = root->rb_node;
3930 struct tcon_link *tlink;
3931
3932 while (node) {
3933 tlink = rb_entry(node, struct tcon_link, tl_rbnode);
3934
3935 if (uid_gt(tlink->tl_uid, uid))
3936 node = node->rb_left;
3937 else if (uid_lt(tlink->tl_uid, uid))
3938 node = node->rb_right;
3939 else
3940 return tlink;
3941 }
3942 return NULL;
3943}
3944
3945/* insert a tcon_link into the tree */
3946static void
3947tlink_rb_insert(struct rb_root *root, struct tcon_link *new_tlink)
3948{
3949 struct rb_node **new = &(root->rb_node), *parent = NULL;
3950 struct tcon_link *tlink;
3951
3952 while (*new) {
3953 tlink = rb_entry(*new, struct tcon_link, tl_rbnode);
3954 parent = *new;
3955
3956 if (uid_gt(tlink->tl_uid, new_tlink->tl_uid))
3957 new = &((*new)->rb_left);
3958 else
3959 new = &((*new)->rb_right);
3960 }
3961
3962 rb_link_node(&new_tlink->tl_rbnode, parent, new);
3963 rb_insert_color(&new_tlink->tl_rbnode, root);
3964}
3965
3966/*
3967 * Find or construct an appropriate tcon given a cifs_sb and the fsuid of the
3968 * current task.
3969 *
3970 * If the superblock doesn't refer to a multiuser mount, then just return
3971 * the master tcon for the mount.
3972 *
3973 * First, search the rbtree for an existing tcon for this fsuid. If one
3974 * exists, then check to see if it's pending construction. If it is then wait
3975 * for construction to complete. Once it's no longer pending, check to see if
3976 * it failed and either return an error or retry construction, depending on
3977 * the timeout.
3978 *
3979 * If one doesn't exist then insert a new tcon_link struct into the tree and
3980 * try to construct a new one.
3981 */
3982struct tcon_link *
3983cifs_sb_tlink(struct cifs_sb_info *cifs_sb)
3984{
3985 int ret;
3986 kuid_t fsuid = current_fsuid();
3987 struct tcon_link *tlink, *newtlink;
3988
3989 if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MULTIUSER))
3990 return cifs_get_tlink(cifs_sb_master_tlink(cifs_sb));
3991
3992 spin_lock(&cifs_sb->tlink_tree_lock);
3993 tlink = tlink_rb_search(&cifs_sb->tlink_tree, fsuid);
3994 if (tlink)
3995 cifs_get_tlink(tlink);
3996 spin_unlock(&cifs_sb->tlink_tree_lock);
3997
3998 if (tlink == NULL) {
3999 newtlink = kzalloc(sizeof(*tlink), GFP_KERNEL);
4000 if (newtlink == NULL)
4001 return ERR_PTR(-ENOMEM);
4002 newtlink->tl_uid = fsuid;
4003 newtlink->tl_tcon = ERR_PTR(-EACCES);
4004 set_bit(TCON_LINK_PENDING, &newtlink->tl_flags);
4005 set_bit(TCON_LINK_IN_TREE, &newtlink->tl_flags);
4006 cifs_get_tlink(newtlink);
4007
4008 spin_lock(&cifs_sb->tlink_tree_lock);
4009 /* was one inserted after previous search? */
4010 tlink = tlink_rb_search(&cifs_sb->tlink_tree, fsuid);
4011 if (tlink) {
4012 cifs_get_tlink(tlink);
4013 spin_unlock(&cifs_sb->tlink_tree_lock);
4014 kfree(newtlink);
4015 goto wait_for_construction;
4016 }
4017 tlink = newtlink;
4018 tlink_rb_insert(&cifs_sb->tlink_tree, tlink);
4019 spin_unlock(&cifs_sb->tlink_tree_lock);
4020 } else {
4021wait_for_construction:
4022 ret = wait_on_bit(&tlink->tl_flags, TCON_LINK_PENDING,
4023 TASK_INTERRUPTIBLE);
4024 if (ret) {
4025 cifs_put_tlink(tlink);
4026 return ERR_PTR(-ERESTARTSYS);
4027 }
4028
4029 /* if it's good, return it */
4030 if (!IS_ERR(tlink->tl_tcon))
4031 return tlink;
4032
4033 /* return error if we tried this already recently */
4034 if (time_before(jiffies, tlink->tl_time + TLINK_ERROR_EXPIRE)) {
4035 cifs_put_tlink(tlink);
4036 return ERR_PTR(-EACCES);
4037 }
4038
4039 if (test_and_set_bit(TCON_LINK_PENDING, &tlink->tl_flags))
4040 goto wait_for_construction;
4041 }
4042
4043 tlink->tl_tcon = cifs_construct_tcon(cifs_sb, fsuid);
4044 clear_bit(TCON_LINK_PENDING, &tlink->tl_flags);
4045 wake_up_bit(&tlink->tl_flags, TCON_LINK_PENDING);
4046
4047 if (IS_ERR(tlink->tl_tcon)) {
4048 cifs_put_tlink(tlink);
4049 return ERR_PTR(-EACCES);
4050 }
4051
4052 return tlink;
4053}
4054
4055/*
4056 * periodic workqueue job that scans tcon_tree for a superblock and closes
4057 * out tcons.
4058 */
4059static void
4060cifs_prune_tlinks(struct work_struct *work)
4061{
4062 struct cifs_sb_info *cifs_sb = container_of(work, struct cifs_sb_info,
4063 prune_tlinks.work);
4064 struct rb_root *root = &cifs_sb->tlink_tree;
4065 struct rb_node *node;
4066 struct rb_node *tmp;
4067 struct tcon_link *tlink;
4068
4069 /*
4070 * Because we drop the spinlock in the loop in order to put the tlink
4071 * it's not guarded against removal of links from the tree. The only
4072 * places that remove entries from the tree are this function and
4073 * umounts. Because this function is non-reentrant and is canceled
4074 * before umount can proceed, this is safe.
4075 */
4076 spin_lock(&cifs_sb->tlink_tree_lock);
4077 node = rb_first(root);
4078 while (node != NULL) {
4079 tmp = node;
4080 node = rb_next(tmp);
4081 tlink = rb_entry(tmp, struct tcon_link, tl_rbnode);
4082
4083 if (test_bit(TCON_LINK_MASTER, &tlink->tl_flags) ||
4084 atomic_read(&tlink->tl_count) != 0 ||
4085 time_after(tlink->tl_time + TLINK_IDLE_EXPIRE, jiffies))
4086 continue;
4087
4088 cifs_get_tlink(tlink);
4089 clear_bit(TCON_LINK_IN_TREE, &tlink->tl_flags);
4090 rb_erase(tmp, root);
4091
4092 spin_unlock(&cifs_sb->tlink_tree_lock);
4093 cifs_put_tlink(tlink);
4094 spin_lock(&cifs_sb->tlink_tree_lock);
4095 }
4096 spin_unlock(&cifs_sb->tlink_tree_lock);
4097
4098 queue_delayed_work(cifsiod_wq, &cifs_sb->prune_tlinks,
4099 TLINK_IDLE_EXPIRE);
4100}
4101
4102#ifndef CONFIG_CIFS_DFS_UPCALL
4103int cifs_tree_connect(const unsigned int xid, struct cifs_tcon *tcon, const struct nls_table *nlsc)
4104{
4105 int rc;
4106 const struct smb_version_operations *ops = tcon->ses->server->ops;
4107
4108 /* only send once per connect */
4109 spin_lock(&tcon->tc_lock);
4110 if (tcon->ses->ses_status != SES_GOOD ||
4111 (tcon->status != TID_NEW &&
4112 tcon->status != TID_NEED_TCON)) {
4113 spin_unlock(&tcon->tc_lock);
4114 return 0;
4115 }
4116 tcon->status = TID_IN_TCON;
4117 spin_unlock(&tcon->tc_lock);
4118
4119 rc = ops->tree_connect(xid, tcon->ses, tcon->tree_name, tcon, nlsc);
4120 if (rc) {
4121 spin_lock(&tcon->tc_lock);
4122 if (tcon->status == TID_IN_TCON)
4123 tcon->status = TID_NEED_TCON;
4124 spin_unlock(&tcon->tc_lock);
4125 } else {
4126 spin_lock(&tcon->tc_lock);
4127 if (tcon->status == TID_IN_TCON)
4128 tcon->status = TID_GOOD;
4129 tcon->need_reconnect = false;
4130 spin_unlock(&tcon->tc_lock);
4131 }
4132
4133 return rc;
4134}
4135#endif