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
55 /* FIXME: should these be tunable? */
56 #define TLINK_ERROR_EXPIRE (1 * HZ)
57 #define TLINK_IDLE_EXPIRE (600 * HZ)
58
59 /* Drop the connection to not overload the server */
60 #define MAX_STATUS_IO_TIMEOUT 5
61
62 static int ip_connect(struct TCP_Server_Info *server);
63 static int generic_ip_connect(struct TCP_Server_Info *server);
64 static void tlink_rb_insert(struct rb_root *root, struct tcon_link *new_tlink);
65 static void cifs_prune_tlinks(struct work_struct *work);
66
67 /*
68 * Resolve hostname and set ip addr in tcp ses. Useful for hostnames that may
69 * get their ip addresses changed at some point.
70 *
71 * This should be called with server->srv_mutex held.
72 */
73 static int reconn_set_ipaddr_from_hostname(struct TCP_Server_Info *server)
74 {
75 int rc;
76 int len;
77 char *unc;
78 struct sockaddr_storage ss;
79
80 if (!server->hostname)
81 return -EINVAL;
82
83 /* if server hostname isn't populated, there's nothing to do here */
84 if (server->hostname[0] == '\0')
85 return 0;
86
87 len = strlen(server->hostname) + 3;
88
89 unc = kmalloc(len, GFP_KERNEL);
90 if (!unc) {
91 cifs_dbg(FYI, "%s: failed to create UNC path\n", __func__);
92 return -ENOMEM;
93 }
94 scnprintf(unc, len, "\\\\%s", server->hostname);
95
96 spin_lock(&server->srv_lock);
97 ss = server->dstaddr;
98 spin_unlock(&server->srv_lock);
99
100 rc = dns_resolve_server_name_to_ip(unc, (struct sockaddr *)&ss, NULL);
101 kfree(unc);
102
103 if (rc < 0) {
104 cifs_dbg(FYI, "%s: failed to resolve server part of %s to IP: %d\n",
105 __func__, server->hostname, rc);
106 } else {
107 spin_lock(&server->srv_lock);
108 memcpy(&server->dstaddr, &ss, sizeof(server->dstaddr));
109 spin_unlock(&server->srv_lock);
110 rc = 0;
111 }
112
113 return rc;
114 }
115
116 static void smb2_query_server_interfaces(struct work_struct *work)
117 {
118 int rc;
119 int xid;
120 struct cifs_tcon *tcon = container_of(work,
121 struct cifs_tcon,
122 query_interfaces.work);
123 struct TCP_Server_Info *server = tcon->ses->server;
124
125 /*
126 * query server network interfaces, in case they change
127 */
128 if (!server->ops->query_server_interfaces)
129 return;
130
131 xid = get_xid();
132 rc = server->ops->query_server_interfaces(xid, tcon, false);
133 free_xid(xid);
134
135 if (rc) {
136 if (rc == -EOPNOTSUPP)
137 return;
138
139 cifs_dbg(FYI, "%s: failed to query server interfaces: %d\n",
140 __func__, rc);
141 }
142
143 queue_delayed_work(cifsiod_wq, &tcon->query_interfaces,
144 (SMB_INTERFACE_POLL_INTERVAL * HZ));
145 }
146
147 /*
148 * Update the tcpStatus for the server.
149 * This is used to signal the cifsd thread to call cifs_reconnect
150 * ONLY cifsd thread should call cifs_reconnect. For any other
151 * thread, use this function
152 *
153 * @server: the tcp ses for which reconnect is needed
154 * @all_channels: if this needs to be done for all channels
155 */
156 void
157 cifs_signal_cifsd_for_reconnect(struct TCP_Server_Info *server,
158 bool all_channels)
159 {
160 struct TCP_Server_Info *pserver;
161 struct cifs_ses *ses;
162 int i;
163
164 /* If server is a channel, select the primary channel */
165 pserver = SERVER_IS_CHAN(server) ? server->primary_server : server;
166
167 /* if we need to signal just this channel */
168 if (!all_channels) {
169 spin_lock(&server->srv_lock);
170 if (server->tcpStatus != CifsExiting)
171 server->tcpStatus = CifsNeedReconnect;
172 spin_unlock(&server->srv_lock);
173 return;
174 }
175
176 spin_lock(&cifs_tcp_ses_lock);
177 list_for_each_entry(ses, &pserver->smb_ses_list, smb_ses_list) {
178 if (cifs_ses_exiting(ses))
179 continue;
180 spin_lock(&ses->chan_lock);
181 for (i = 0; i < ses->chan_count; i++) {
182 if (!ses->chans[i].server)
183 continue;
184
185 spin_lock(&ses->chans[i].server->srv_lock);
186 if (ses->chans[i].server->tcpStatus != CifsExiting)
187 ses->chans[i].server->tcpStatus = CifsNeedReconnect;
188 spin_unlock(&ses->chans[i].server->srv_lock);
189 }
190 spin_unlock(&ses->chan_lock);
191 }
192 spin_unlock(&cifs_tcp_ses_lock);
193 }
194
195 /*
196 * Mark all sessions and tcons for reconnect.
197 * IMPORTANT: make sure that this gets called only from
198 * cifsd thread. For any other thread, use
199 * cifs_signal_cifsd_for_reconnect
200 *
201 * @server: the tcp ses for which reconnect is needed
202 * @server needs to be previously set to CifsNeedReconnect.
203 * @mark_smb_session: whether even sessions need to be marked
204 */
205 void
206 cifs_mark_tcp_ses_conns_for_reconnect(struct TCP_Server_Info *server,
207 bool mark_smb_session)
208 {
209 struct TCP_Server_Info *pserver;
210 struct cifs_ses *ses, *nses;
211 struct cifs_tcon *tcon;
212
213 /*
214 * before reconnecting the tcp session, mark the smb session (uid) and the tid bad so they
215 * are not used until reconnected.
216 */
217 cifs_dbg(FYI, "%s: marking necessary sessions and tcons for reconnect\n", __func__);
218
219 /* If server is a channel, select the primary channel */
220 pserver = SERVER_IS_CHAN(server) ? server->primary_server : server;
221
222 /*
223 * if the server has been marked for termination, there is a
224 * chance that the remaining channels all need reconnect. To be
225 * on the safer side, mark the session and trees for reconnect
226 * for this scenario. This might cause a few redundant session
227 * setup and tree connect requests, but it is better than not doing
228 * a tree connect when needed, and all following requests failing
229 */
230 if (server->terminate) {
231 mark_smb_session = true;
232 server = pserver;
233 }
234
235 spin_lock(&cifs_tcp_ses_lock);
236 list_for_each_entry_safe(ses, nses, &pserver->smb_ses_list, smb_ses_list) {
237 spin_lock(&ses->ses_lock);
238 if (ses->ses_status == SES_EXITING) {
239 spin_unlock(&ses->ses_lock);
240 continue;
241 }
242 spin_unlock(&ses->ses_lock);
243
244 spin_lock(&ses->chan_lock);
245 if (cifs_ses_get_chan_index(ses, server) ==
246 CIFS_INVAL_CHAN_INDEX) {
247 spin_unlock(&ses->chan_lock);
248 continue;
249 }
250
251 if (!cifs_chan_is_iface_active(ses, server)) {
252 spin_unlock(&ses->chan_lock);
253 cifs_chan_update_iface(ses, server);
254 spin_lock(&ses->chan_lock);
255 }
256
257 if (!mark_smb_session && cifs_chan_needs_reconnect(ses, server)) {
258 spin_unlock(&ses->chan_lock);
259 continue;
260 }
261
262 if (mark_smb_session)
263 CIFS_SET_ALL_CHANS_NEED_RECONNECT(ses);
264 else
265 cifs_chan_set_need_reconnect(ses, server);
266
267 cifs_dbg(FYI, "%s: channel connect bitmap: 0x%lx\n",
268 __func__, ses->chans_need_reconnect);
269
270 /* If all channels need reconnect, then tcon needs reconnect */
271 if (!mark_smb_session && !CIFS_ALL_CHANS_NEED_RECONNECT(ses)) {
272 spin_unlock(&ses->chan_lock);
273 continue;
274 }
275 spin_unlock(&ses->chan_lock);
276
277 spin_lock(&ses->ses_lock);
278 ses->ses_status = SES_NEED_RECON;
279 spin_unlock(&ses->ses_lock);
280
281 list_for_each_entry(tcon, &ses->tcon_list, tcon_list) {
282 tcon->need_reconnect = true;
283 spin_lock(&tcon->tc_lock);
284 tcon->status = TID_NEED_RECON;
285 spin_unlock(&tcon->tc_lock);
286
287 cancel_delayed_work(&tcon->query_interfaces);
288 }
289 if (ses->tcon_ipc) {
290 ses->tcon_ipc->need_reconnect = true;
291 spin_lock(&ses->tcon_ipc->tc_lock);
292 ses->tcon_ipc->status = TID_NEED_RECON;
293 spin_unlock(&ses->tcon_ipc->tc_lock);
294 }
295 }
296 spin_unlock(&cifs_tcp_ses_lock);
297 }
298
299 static void
300 cifs_abort_connection(struct TCP_Server_Info *server)
301 {
302 struct mid_q_entry *mid, *nmid;
303 struct list_head retry_list;
304
305 server->maxBuf = 0;
306 server->max_read = 0;
307
308 /* do not want to be sending data on a socket we are freeing */
309 cifs_dbg(FYI, "%s: tearing down socket\n", __func__);
310 cifs_server_lock(server);
311 if (server->ssocket) {
312 cifs_dbg(FYI, "State: 0x%x Flags: 0x%lx\n", server->ssocket->state,
313 server->ssocket->flags);
314 kernel_sock_shutdown(server->ssocket, SHUT_WR);
315 cifs_dbg(FYI, "Post shutdown state: 0x%x Flags: 0x%lx\n", server->ssocket->state,
316 server->ssocket->flags);
317 sock_release(server->ssocket);
318 server->ssocket = NULL;
319 }
320 server->sequence_number = 0;
321 server->session_estab = false;
322 kfree_sensitive(server->session_key.response);
323 server->session_key.response = NULL;
324 server->session_key.len = 0;
325 server->lstrp = jiffies;
326
327 /* mark submitted MIDs for retry and issue callback */
328 INIT_LIST_HEAD(&retry_list);
329 cifs_dbg(FYI, "%s: moving mids to private list\n", __func__);
330 spin_lock(&server->mid_lock);
331 list_for_each_entry_safe(mid, nmid, &server->pending_mid_q, qhead) {
332 kref_get(&mid->refcount);
333 if (mid->mid_state == MID_REQUEST_SUBMITTED)
334 mid->mid_state = MID_RETRY_NEEDED;
335 list_move(&mid->qhead, &retry_list);
336 mid->mid_flags |= MID_DELETED;
337 }
338 spin_unlock(&server->mid_lock);
339 cifs_server_unlock(server);
340
341 cifs_dbg(FYI, "%s: issuing mid callbacks\n", __func__);
342 list_for_each_entry_safe(mid, nmid, &retry_list, qhead) {
343 list_del_init(&mid->qhead);
344 mid->callback(mid);
345 release_mid(mid);
346 }
347
348 if (cifs_rdma_enabled(server)) {
349 cifs_server_lock(server);
350 smbd_destroy(server);
351 cifs_server_unlock(server);
352 }
353 }
354
355 static bool cifs_tcp_ses_needs_reconnect(struct TCP_Server_Info *server, int num_targets)
356 {
357 spin_lock(&server->srv_lock);
358 server->nr_targets = num_targets;
359 if (server->tcpStatus == CifsExiting) {
360 /* the demux thread will exit normally next time through the loop */
361 spin_unlock(&server->srv_lock);
362 wake_up(&server->response_q);
363 return false;
364 }
365
366 cifs_dbg(FYI, "Mark tcp session as need reconnect\n");
367 trace_smb3_reconnect(server->CurrentMid, server->conn_id,
368 server->hostname);
369 server->tcpStatus = CifsNeedReconnect;
370
371 spin_unlock(&server->srv_lock);
372 return true;
373 }
374
375 /*
376 * cifs tcp session reconnection
377 *
378 * mark tcp session as reconnecting so temporarily locked
379 * mark all smb sessions as reconnecting for tcp session
380 * reconnect tcp session
381 * wake up waiters on reconnection? - (not needed currently)
382 *
383 * if mark_smb_session is passed as true, unconditionally mark
384 * the smb session (and tcon) for reconnect as well. This value
385 * doesn't really matter for non-multichannel scenario.
386 *
387 */
388 static int __cifs_reconnect(struct TCP_Server_Info *server,
389 bool mark_smb_session)
390 {
391 int rc = 0;
392
393 if (!cifs_tcp_ses_needs_reconnect(server, 1))
394 return 0;
395
396 cifs_mark_tcp_ses_conns_for_reconnect(server, mark_smb_session);
397
398 cifs_abort_connection(server);
399
400 do {
401 try_to_freeze();
402 cifs_server_lock(server);
403
404 if (!cifs_swn_set_server_dstaddr(server)) {
405 /* resolve the hostname again to make sure that IP address is up-to-date */
406 rc = reconn_set_ipaddr_from_hostname(server);
407 cifs_dbg(FYI, "%s: reconn_set_ipaddr_from_hostname: rc=%d\n", __func__, rc);
408 }
409
410 if (cifs_rdma_enabled(server))
411 rc = smbd_reconnect(server);
412 else
413 rc = generic_ip_connect(server);
414 if (rc) {
415 cifs_server_unlock(server);
416 cifs_dbg(FYI, "%s: reconnect error %d\n", __func__, rc);
417 msleep(3000);
418 } else {
419 atomic_inc(&tcpSesReconnectCount);
420 set_credits(server, 1);
421 spin_lock(&server->srv_lock);
422 if (server->tcpStatus != CifsExiting)
423 server->tcpStatus = CifsNeedNegotiate;
424 spin_unlock(&server->srv_lock);
425 cifs_swn_reset_server_dstaddr(server);
426 cifs_server_unlock(server);
427 mod_delayed_work(cifsiod_wq, &server->reconnect, 0);
428 }
429 } while (server->tcpStatus == CifsNeedReconnect);
430
431 spin_lock(&server->srv_lock);
432 if (server->tcpStatus == CifsNeedNegotiate)
433 mod_delayed_work(cifsiod_wq, &server->echo, 0);
434 spin_unlock(&server->srv_lock);
435
436 wake_up(&server->response_q);
437 return rc;
438 }
439
440 #ifdef CONFIG_CIFS_DFS_UPCALL
441 static int __reconnect_target_unlocked(struct TCP_Server_Info *server, const char *target)
442 {
443 int rc;
444 char *hostname;
445
446 if (!cifs_swn_set_server_dstaddr(server)) {
447 if (server->hostname != target) {
448 hostname = extract_hostname(target);
449 if (!IS_ERR(hostname)) {
450 spin_lock(&server->srv_lock);
451 kfree(server->hostname);
452 server->hostname = hostname;
453 spin_unlock(&server->srv_lock);
454 } else {
455 cifs_dbg(FYI, "%s: couldn't extract hostname or address from dfs target: %ld\n",
456 __func__, PTR_ERR(hostname));
457 cifs_dbg(FYI, "%s: default to last target server: %s\n", __func__,
458 server->hostname);
459 }
460 }
461 /* resolve the hostname again to make sure that IP address is up-to-date. */
462 rc = reconn_set_ipaddr_from_hostname(server);
463 cifs_dbg(FYI, "%s: reconn_set_ipaddr_from_hostname: rc=%d\n", __func__, rc);
464 }
465 /* Reconnect the socket */
466 if (cifs_rdma_enabled(server))
467 rc = smbd_reconnect(server);
468 else
469 rc = generic_ip_connect(server);
470
471 return rc;
472 }
473
474 static int reconnect_target_unlocked(struct TCP_Server_Info *server, struct dfs_cache_tgt_list *tl,
475 struct dfs_cache_tgt_iterator **target_hint)
476 {
477 int rc;
478 struct dfs_cache_tgt_iterator *tit;
479
480 *target_hint = NULL;
481
482 /* If dfs target list is empty, then reconnect to last server */
483 tit = dfs_cache_get_tgt_iterator(tl);
484 if (!tit)
485 return __reconnect_target_unlocked(server, server->hostname);
486
487 /* Otherwise, try every dfs target in @tl */
488 for (; tit; tit = dfs_cache_get_next_tgt(tl, tit)) {
489 rc = __reconnect_target_unlocked(server, dfs_cache_get_tgt_name(tit));
490 if (!rc) {
491 *target_hint = tit;
492 break;
493 }
494 }
495 return rc;
496 }
497
498 static int reconnect_dfs_server(struct TCP_Server_Info *server)
499 {
500 struct dfs_cache_tgt_iterator *target_hint = NULL;
501
502 DFS_CACHE_TGT_LIST(tl);
503 int num_targets = 0;
504 int rc = 0;
505
506 /*
507 * Determine the number of dfs targets the referral path in @cifs_sb resolves to.
508 *
509 * smb2_reconnect() needs to know how long it should wait based upon the number of dfs
510 * targets (server->nr_targets). It's also possible that the cached referral was cleared
511 * through /proc/fs/cifs/dfscache or the target list is empty due to server settings after
512 * refreshing the referral, so, in this case, default it to 1.
513 */
514 mutex_lock(&server->refpath_lock);
515 if (!dfs_cache_noreq_find(server->leaf_fullpath + 1, NULL, &tl))
516 num_targets = dfs_cache_get_nr_tgts(&tl);
517 mutex_unlock(&server->refpath_lock);
518 if (!num_targets)
519 num_targets = 1;
520
521 if (!cifs_tcp_ses_needs_reconnect(server, num_targets))
522 return 0;
523
524 /*
525 * Unconditionally mark all sessions & tcons for reconnect as we might be connecting to a
526 * different server or share during failover. It could be improved by adding some logic to
527 * only do that in case it connects to a different server or share, though.
528 */
529 cifs_mark_tcp_ses_conns_for_reconnect(server, true);
530
531 cifs_abort_connection(server);
532
533 do {
534 try_to_freeze();
535 cifs_server_lock(server);
536
537 rc = reconnect_target_unlocked(server, &tl, &target_hint);
538 if (rc) {
539 /* Failed to reconnect socket */
540 cifs_server_unlock(server);
541 cifs_dbg(FYI, "%s: reconnect error %d\n", __func__, rc);
542 msleep(3000);
543 continue;
544 }
545 /*
546 * Socket was created. Update tcp session status to CifsNeedNegotiate so that a
547 * process waiting for reconnect will know it needs to re-establish session and tcon
548 * through the reconnected target server.
549 */
550 atomic_inc(&tcpSesReconnectCount);
551 set_credits(server, 1);
552 spin_lock(&server->srv_lock);
553 if (server->tcpStatus != CifsExiting)
554 server->tcpStatus = CifsNeedNegotiate;
555 spin_unlock(&server->srv_lock);
556 cifs_swn_reset_server_dstaddr(server);
557 cifs_server_unlock(server);
558 mod_delayed_work(cifsiod_wq, &server->reconnect, 0);
559 } while (server->tcpStatus == CifsNeedReconnect);
560
561 mutex_lock(&server->refpath_lock);
562 dfs_cache_noreq_update_tgthint(server->leaf_fullpath + 1, target_hint);
563 mutex_unlock(&server->refpath_lock);
564 dfs_cache_free_tgts(&tl);
565
566 /* Need to set up echo worker again once connection has been established */
567 spin_lock(&server->srv_lock);
568 if (server->tcpStatus == CifsNeedNegotiate)
569 mod_delayed_work(cifsiod_wq, &server->echo, 0);
570 spin_unlock(&server->srv_lock);
571
572 wake_up(&server->response_q);
573 return rc;
574 }
575
576 int cifs_reconnect(struct TCP_Server_Info *server, bool mark_smb_session)
577 {
578 mutex_lock(&server->refpath_lock);
579 if (!server->leaf_fullpath) {
580 mutex_unlock(&server->refpath_lock);
581 return __cifs_reconnect(server, mark_smb_session);
582 }
583 mutex_unlock(&server->refpath_lock);
584
585 return reconnect_dfs_server(server);
586 }
587 #else
588 int cifs_reconnect(struct TCP_Server_Info *server, bool mark_smb_session)
589 {
590 return __cifs_reconnect(server, mark_smb_session);
591 }
592 #endif
593
594 static void
595 cifs_echo_request(struct work_struct *work)
596 {
597 int rc;
598 struct TCP_Server_Info *server = container_of(work,
599 struct TCP_Server_Info, echo.work);
600
601 /*
602 * We cannot send an echo if it is disabled.
603 * Also, no need to ping if we got a response recently.
604 */
605
606 if (server->tcpStatus == CifsNeedReconnect ||
607 server->tcpStatus == CifsExiting ||
608 server->tcpStatus == CifsNew ||
609 (server->ops->can_echo && !server->ops->can_echo(server)) ||
610 time_before(jiffies, server->lstrp + server->echo_interval - HZ))
611 goto requeue_echo;
612
613 rc = server->ops->echo ? server->ops->echo(server) : -ENOSYS;
614 cifs_server_dbg(FYI, "send echo request: rc = %d\n", rc);
615
616 /* Check witness registrations */
617 cifs_swn_check();
618
619 requeue_echo:
620 queue_delayed_work(cifsiod_wq, &server->echo, server->echo_interval);
621 }
622
623 static bool
624 allocate_buffers(struct TCP_Server_Info *server)
625 {
626 if (!server->bigbuf) {
627 server->bigbuf = (char *)cifs_buf_get();
628 if (!server->bigbuf) {
629 cifs_server_dbg(VFS, "No memory for large SMB response\n");
630 msleep(3000);
631 /* retry will check if exiting */
632 return false;
633 }
634 } else if (server->large_buf) {
635 /* we are reusing a dirty large buf, clear its start */
636 memset(server->bigbuf, 0, HEADER_SIZE(server));
637 }
638
639 if (!server->smallbuf) {
640 server->smallbuf = (char *)cifs_small_buf_get();
641 if (!server->smallbuf) {
642 cifs_server_dbg(VFS, "No memory for SMB response\n");
643 msleep(1000);
644 /* retry will check if exiting */
645 return false;
646 }
647 /* beginning of smb buffer is cleared in our buf_get */
648 } else {
649 /* if existing small buf clear beginning */
650 memset(server->smallbuf, 0, HEADER_SIZE(server));
651 }
652
653 return true;
654 }
655
656 static bool
657 server_unresponsive(struct TCP_Server_Info *server)
658 {
659 /*
660 * We need to wait 3 echo intervals to make sure we handle such
661 * situations right:
662 * 1s client sends a normal SMB request
663 * 2s client gets a response
664 * 30s echo workqueue job pops, and decides we got a response recently
665 * and don't need to send another
666 * ...
667 * 65s kernel_recvmsg times out, and we see that we haven't gotten
668 * a response in >60s.
669 */
670 spin_lock(&server->srv_lock);
671 if ((server->tcpStatus == CifsGood ||
672 server->tcpStatus == CifsNeedNegotiate) &&
673 (!server->ops->can_echo || server->ops->can_echo(server)) &&
674 time_after(jiffies, server->lstrp + 3 * server->echo_interval)) {
675 spin_unlock(&server->srv_lock);
676 cifs_server_dbg(VFS, "has not responded in %lu seconds. Reconnecting...\n",
677 (3 * server->echo_interval) / HZ);
678 cifs_reconnect(server, false);
679 return true;
680 }
681 spin_unlock(&server->srv_lock);
682
683 return false;
684 }
685
686 static inline bool
687 zero_credits(struct TCP_Server_Info *server)
688 {
689 int val;
690
691 spin_lock(&server->req_lock);
692 val = server->credits + server->echo_credits + server->oplock_credits;
693 if (server->in_flight == 0 && val == 0) {
694 spin_unlock(&server->req_lock);
695 return true;
696 }
697 spin_unlock(&server->req_lock);
698 return false;
699 }
700
701 static int
702 cifs_readv_from_socket(struct TCP_Server_Info *server, struct msghdr *smb_msg)
703 {
704 int length = 0;
705 int total_read;
706
707 for (total_read = 0; msg_data_left(smb_msg); total_read += length) {
708 try_to_freeze();
709
710 /* reconnect if no credits and no requests in flight */
711 if (zero_credits(server)) {
712 cifs_reconnect(server, false);
713 return -ECONNABORTED;
714 }
715
716 if (server_unresponsive(server))
717 return -ECONNABORTED;
718 if (cifs_rdma_enabled(server) && server->smbd_conn)
719 length = smbd_recv(server->smbd_conn, smb_msg);
720 else
721 length = sock_recvmsg(server->ssocket, smb_msg, 0);
722
723 spin_lock(&server->srv_lock);
724 if (server->tcpStatus == CifsExiting) {
725 spin_unlock(&server->srv_lock);
726 return -ESHUTDOWN;
727 }
728
729 if (server->tcpStatus == CifsNeedReconnect) {
730 spin_unlock(&server->srv_lock);
731 cifs_reconnect(server, false);
732 return -ECONNABORTED;
733 }
734 spin_unlock(&server->srv_lock);
735
736 if (length == -ERESTARTSYS ||
737 length == -EAGAIN ||
738 length == -EINTR) {
739 /*
740 * Minimum sleep to prevent looping, allowing socket
741 * to clear and app threads to set tcpStatus
742 * CifsNeedReconnect if server hung.
743 */
744 usleep_range(1000, 2000);
745 length = 0;
746 continue;
747 }
748
749 if (length <= 0) {
750 cifs_dbg(FYI, "Received no data or error: %d\n", length);
751 cifs_reconnect(server, false);
752 return -ECONNABORTED;
753 }
754 }
755 return total_read;
756 }
757
758 int
759 cifs_read_from_socket(struct TCP_Server_Info *server, char *buf,
760 unsigned int to_read)
761 {
762 struct msghdr smb_msg = {};
763 struct kvec iov = {.iov_base = buf, .iov_len = to_read};
764
765 iov_iter_kvec(&smb_msg.msg_iter, ITER_DEST, &iov, 1, to_read);
766
767 return cifs_readv_from_socket(server, &smb_msg);
768 }
769
770 ssize_t
771 cifs_discard_from_socket(struct TCP_Server_Info *server, size_t to_read)
772 {
773 struct msghdr smb_msg = {};
774
775 /*
776 * iov_iter_discard already sets smb_msg.type and count and iov_offset
777 * and cifs_readv_from_socket sets msg_control and msg_controllen
778 * so little to initialize in struct msghdr
779 */
780 iov_iter_discard(&smb_msg.msg_iter, ITER_DEST, to_read);
781
782 return cifs_readv_from_socket(server, &smb_msg);
783 }
784
785 int
786 cifs_read_page_from_socket(struct TCP_Server_Info *server, struct page *page,
787 unsigned int page_offset, unsigned int to_read)
788 {
789 struct msghdr smb_msg = {};
790 struct bio_vec bv;
791
792 bvec_set_page(&bv, page, to_read, page_offset);
793 iov_iter_bvec(&smb_msg.msg_iter, ITER_DEST, &bv, 1, to_read);
794 return cifs_readv_from_socket(server, &smb_msg);
795 }
796
797 int
798 cifs_read_iter_from_socket(struct TCP_Server_Info *server, struct iov_iter *iter,
799 unsigned int to_read)
800 {
801 struct msghdr smb_msg = { .msg_iter = *iter };
802 int ret;
803
804 iov_iter_truncate(&smb_msg.msg_iter, to_read);
805 ret = cifs_readv_from_socket(server, &smb_msg);
806 if (ret > 0)
807 iov_iter_advance(iter, ret);
808 return ret;
809 }
810
811 static bool
812 is_smb_response(struct TCP_Server_Info *server, unsigned char type)
813 {
814 /*
815 * The first byte big endian of the length field,
816 * is actually not part of the length but the type
817 * with the most common, zero, as regular data.
818 */
819 switch (type) {
820 case RFC1002_SESSION_MESSAGE:
821 /* Regular SMB response */
822 return true;
823 case RFC1002_SESSION_KEEP_ALIVE:
824 cifs_dbg(FYI, "RFC 1002 session keep alive\n");
825 break;
826 case RFC1002_POSITIVE_SESSION_RESPONSE:
827 cifs_dbg(FYI, "RFC 1002 positive session response\n");
828 break;
829 case RFC1002_NEGATIVE_SESSION_RESPONSE:
830 /*
831 * We get this from Windows 98 instead of an error on
832 * SMB negprot response.
833 */
834 cifs_dbg(FYI, "RFC 1002 negative session response\n");
835 /* give server a second to clean up */
836 msleep(1000);
837 /*
838 * Always try 445 first on reconnect since we get NACK
839 * on some if we ever connected to port 139 (the NACK
840 * is since we do not begin with RFC1001 session
841 * initialize frame).
842 */
843 cifs_set_port((struct sockaddr *)&server->dstaddr, CIFS_PORT);
844 cifs_reconnect(server, true);
845 break;
846 default:
847 cifs_server_dbg(VFS, "RFC 1002 unknown response type 0x%x\n", type);
848 cifs_reconnect(server, true);
849 }
850
851 return false;
852 }
853
854 void
855 dequeue_mid(struct mid_q_entry *mid, bool malformed)
856 {
857 #ifdef CONFIG_CIFS_STATS2
858 mid->when_received = jiffies;
859 #endif
860 spin_lock(&mid->server->mid_lock);
861 if (!malformed)
862 mid->mid_state = MID_RESPONSE_RECEIVED;
863 else
864 mid->mid_state = MID_RESPONSE_MALFORMED;
865 /*
866 * Trying to handle/dequeue a mid after the send_recv()
867 * function has finished processing it is a bug.
868 */
869 if (mid->mid_flags & MID_DELETED) {
870 spin_unlock(&mid->server->mid_lock);
871 pr_warn_once("trying to dequeue a deleted mid\n");
872 } else {
873 list_del_init(&mid->qhead);
874 mid->mid_flags |= MID_DELETED;
875 spin_unlock(&mid->server->mid_lock);
876 }
877 }
878
879 static unsigned int
880 smb2_get_credits_from_hdr(char *buffer, struct TCP_Server_Info *server)
881 {
882 struct smb2_hdr *shdr = (struct smb2_hdr *)buffer;
883
884 /*
885 * SMB1 does not use credits.
886 */
887 if (is_smb1(server))
888 return 0;
889
890 return le16_to_cpu(shdr->CreditRequest);
891 }
892
893 static void
894 handle_mid(struct mid_q_entry *mid, struct TCP_Server_Info *server,
895 char *buf, int malformed)
896 {
897 if (server->ops->check_trans2 &&
898 server->ops->check_trans2(mid, server, buf, malformed))
899 return;
900 mid->credits_received = smb2_get_credits_from_hdr(buf, server);
901 mid->resp_buf = buf;
902 mid->large_buf = server->large_buf;
903 /* Was previous buf put in mpx struct for multi-rsp? */
904 if (!mid->multiRsp) {
905 /* smb buffer will be freed by user thread */
906 if (server->large_buf)
907 server->bigbuf = NULL;
908 else
909 server->smallbuf = NULL;
910 }
911 dequeue_mid(mid, malformed);
912 }
913
914 int
915 cifs_enable_signing(struct TCP_Server_Info *server, bool mnt_sign_required)
916 {
917 bool srv_sign_required = server->sec_mode & server->vals->signing_required;
918 bool srv_sign_enabled = server->sec_mode & server->vals->signing_enabled;
919 bool mnt_sign_enabled;
920
921 /*
922 * Is signing required by mnt options? If not then check
923 * global_secflags to see if it is there.
924 */
925 if (!mnt_sign_required)
926 mnt_sign_required = ((global_secflags & CIFSSEC_MUST_SIGN) ==
927 CIFSSEC_MUST_SIGN);
928
929 /*
930 * If signing is required then it's automatically enabled too,
931 * otherwise, check to see if the secflags allow it.
932 */
933 mnt_sign_enabled = mnt_sign_required ? mnt_sign_required :
934 (global_secflags & CIFSSEC_MAY_SIGN);
935
936 /* If server requires signing, does client allow it? */
937 if (srv_sign_required) {
938 if (!mnt_sign_enabled) {
939 cifs_dbg(VFS, "Server requires signing, but it's disabled in SecurityFlags!\n");
940 return -EOPNOTSUPP;
941 }
942 server->sign = true;
943 }
944
945 /* If client requires signing, does server allow it? */
946 if (mnt_sign_required) {
947 if (!srv_sign_enabled) {
948 cifs_dbg(VFS, "Server does not support signing!\n");
949 return -EOPNOTSUPP;
950 }
951 server->sign = true;
952 }
953
954 if (cifs_rdma_enabled(server) && server->sign)
955 cifs_dbg(VFS, "Signing is enabled, and RDMA read/write will be disabled\n");
956
957 return 0;
958 }
959
960 static noinline_for_stack void
961 clean_demultiplex_info(struct TCP_Server_Info *server)
962 {
963 int length;
964
965 /* take it off the list, if it's not already */
966 spin_lock(&server->srv_lock);
967 list_del_init(&server->tcp_ses_list);
968 spin_unlock(&server->srv_lock);
969
970 cancel_delayed_work_sync(&server->echo);
971
972 spin_lock(&server->srv_lock);
973 server->tcpStatus = CifsExiting;
974 spin_unlock(&server->srv_lock);
975 wake_up_all(&server->response_q);
976
977 /* check if we have blocked requests that need to free */
978 spin_lock(&server->req_lock);
979 if (server->credits <= 0)
980 server->credits = 1;
981 spin_unlock(&server->req_lock);
982 /*
983 * Although there should not be any requests blocked on this queue it
984 * can not hurt to be paranoid and try to wake up requests that may
985 * haven been blocked when more than 50 at time were on the wire to the
986 * same server - they now will see the session is in exit state and get
987 * out of SendReceive.
988 */
989 wake_up_all(&server->request_q);
990 /* give those requests time to exit */
991 msleep(125);
992 if (cifs_rdma_enabled(server))
993 smbd_destroy(server);
994 if (server->ssocket) {
995 sock_release(server->ssocket);
996 server->ssocket = NULL;
997 }
998
999 if (!list_empty(&server->pending_mid_q)) {
1000 struct list_head dispose_list;
1001 struct mid_q_entry *mid_entry;
1002 struct list_head *tmp, *tmp2;
1003
1004 INIT_LIST_HEAD(&dispose_list);
1005 spin_lock(&server->mid_lock);
1006 list_for_each_safe(tmp, tmp2, &server->pending_mid_q) {
1007 mid_entry = list_entry(tmp, struct mid_q_entry, qhead);
1008 cifs_dbg(FYI, "Clearing mid %llu\n", mid_entry->mid);
1009 kref_get(&mid_entry->refcount);
1010 mid_entry->mid_state = MID_SHUTDOWN;
1011 list_move(&mid_entry->qhead, &dispose_list);
1012 mid_entry->mid_flags |= MID_DELETED;
1013 }
1014 spin_unlock(&server->mid_lock);
1015
1016 /* now walk dispose list and issue callbacks */
1017 list_for_each_safe(tmp, tmp2, &dispose_list) {
1018 mid_entry = list_entry(tmp, struct mid_q_entry, qhead);
1019 cifs_dbg(FYI, "Callback mid %llu\n", mid_entry->mid);
1020 list_del_init(&mid_entry->qhead);
1021 mid_entry->callback(mid_entry);
1022 release_mid(mid_entry);
1023 }
1024 /* 1/8th of sec is more than enough time for them to exit */
1025 msleep(125);
1026 }
1027
1028 if (!list_empty(&server->pending_mid_q)) {
1029 /*
1030 * mpx threads have not exited yet give them at least the smb
1031 * send timeout time for long ops.
1032 *
1033 * Due to delays on oplock break requests, we need to wait at
1034 * least 45 seconds before giving up on a request getting a
1035 * response and going ahead and killing cifsd.
1036 */
1037 cifs_dbg(FYI, "Wait for exit from demultiplex thread\n");
1038 msleep(46000);
1039 /*
1040 * If threads still have not exited they are probably never
1041 * coming home not much else we can do but free the memory.
1042 */
1043 }
1044
1045 kfree(server->leaf_fullpath);
1046 kfree(server);
1047
1048 length = atomic_dec_return(&tcpSesAllocCount);
1049 if (length > 0)
1050 mempool_resize(cifs_req_poolp, length + cifs_min_rcv);
1051 }
1052
1053 static int
1054 standard_receive3(struct TCP_Server_Info *server, struct mid_q_entry *mid)
1055 {
1056 int length;
1057 char *buf = server->smallbuf;
1058 unsigned int pdu_length = server->pdu_size;
1059
1060 /* make sure this will fit in a large buffer */
1061 if (pdu_length > CIFSMaxBufSize + MAX_HEADER_SIZE(server) -
1062 HEADER_PREAMBLE_SIZE(server)) {
1063 cifs_server_dbg(VFS, "SMB response too long (%u bytes)\n", pdu_length);
1064 cifs_reconnect(server, true);
1065 return -ECONNABORTED;
1066 }
1067
1068 /* switch to large buffer if too big for a small one */
1069 if (pdu_length > MAX_CIFS_SMALL_BUFFER_SIZE - 4) {
1070 server->large_buf = true;
1071 memcpy(server->bigbuf, buf, server->total_read);
1072 buf = server->bigbuf;
1073 }
1074
1075 /* now read the rest */
1076 length = cifs_read_from_socket(server, buf + HEADER_SIZE(server) - 1,
1077 pdu_length - MID_HEADER_SIZE(server));
1078
1079 if (length < 0)
1080 return length;
1081 server->total_read += length;
1082
1083 dump_smb(buf, server->total_read);
1084
1085 return cifs_handle_standard(server, mid);
1086 }
1087
1088 int
1089 cifs_handle_standard(struct TCP_Server_Info *server, struct mid_q_entry *mid)
1090 {
1091 char *buf = server->large_buf ? server->bigbuf : server->smallbuf;
1092 int rc;
1093
1094 /*
1095 * We know that we received enough to get to the MID as we
1096 * checked the pdu_length earlier. Now check to see
1097 * if the rest of the header is OK.
1098 *
1099 * 48 bytes is enough to display the header and a little bit
1100 * into the payload for debugging purposes.
1101 */
1102 rc = server->ops->check_message(buf, server->total_read, server);
1103 if (rc)
1104 cifs_dump_mem("Bad SMB: ", buf,
1105 min_t(unsigned int, server->total_read, 48));
1106
1107 if (server->ops->is_session_expired &&
1108 server->ops->is_session_expired(buf)) {
1109 cifs_reconnect(server, true);
1110 return -1;
1111 }
1112
1113 if (server->ops->is_status_pending &&
1114 server->ops->is_status_pending(buf, server))
1115 return -1;
1116
1117 if (!mid)
1118 return rc;
1119
1120 handle_mid(mid, server, buf, rc);
1121 return 0;
1122 }
1123
1124 static void
1125 smb2_add_credits_from_hdr(char *buffer, struct TCP_Server_Info *server)
1126 {
1127 struct smb2_hdr *shdr = (struct smb2_hdr *)buffer;
1128 int scredits, in_flight;
1129
1130 /*
1131 * SMB1 does not use credits.
1132 */
1133 if (is_smb1(server))
1134 return;
1135
1136 if (shdr->CreditRequest) {
1137 spin_lock(&server->req_lock);
1138 server->credits += le16_to_cpu(shdr->CreditRequest);
1139 scredits = server->credits;
1140 in_flight = server->in_flight;
1141 spin_unlock(&server->req_lock);
1142 wake_up(&server->request_q);
1143
1144 trace_smb3_hdr_credits(server->CurrentMid,
1145 server->conn_id, server->hostname, scredits,
1146 le16_to_cpu(shdr->CreditRequest), in_flight);
1147 cifs_server_dbg(FYI, "%s: added %u credits total=%d\n",
1148 __func__, le16_to_cpu(shdr->CreditRequest),
1149 scredits);
1150 }
1151 }
1152
1153
1154 static int
1155 cifs_demultiplex_thread(void *p)
1156 {
1157 int i, num_mids, length;
1158 struct TCP_Server_Info *server = p;
1159 unsigned int pdu_length;
1160 unsigned int next_offset;
1161 char *buf = NULL;
1162 struct task_struct *task_to_wake = NULL;
1163 struct mid_q_entry *mids[MAX_COMPOUND];
1164 char *bufs[MAX_COMPOUND];
1165 unsigned int noreclaim_flag, num_io_timeout = 0;
1166 bool pending_reconnect = false;
1167
1168 noreclaim_flag = memalloc_noreclaim_save();
1169 cifs_dbg(FYI, "Demultiplex PID: %d\n", task_pid_nr(current));
1170
1171 length = atomic_inc_return(&tcpSesAllocCount);
1172 if (length > 1)
1173 mempool_resize(cifs_req_poolp, length + cifs_min_rcv);
1174
1175 set_freezable();
1176 allow_kernel_signal(SIGKILL);
1177 while (server->tcpStatus != CifsExiting) {
1178 if (try_to_freeze())
1179 continue;
1180
1181 if (!allocate_buffers(server))
1182 continue;
1183
1184 server->large_buf = false;
1185 buf = server->smallbuf;
1186 pdu_length = 4; /* enough to get RFC1001 header */
1187
1188 length = cifs_read_from_socket(server, buf, pdu_length);
1189 if (length < 0)
1190 continue;
1191
1192 if (is_smb1(server))
1193 server->total_read = length;
1194 else
1195 server->total_read = 0;
1196
1197 /*
1198 * The right amount was read from socket - 4 bytes,
1199 * so we can now interpret the length field.
1200 */
1201 pdu_length = get_rfc1002_length(buf);
1202
1203 cifs_dbg(FYI, "RFC1002 header 0x%x\n", pdu_length);
1204 if (!is_smb_response(server, buf[0]))
1205 continue;
1206
1207 pending_reconnect = false;
1208 next_pdu:
1209 server->pdu_size = pdu_length;
1210
1211 /* make sure we have enough to get to the MID */
1212 if (server->pdu_size < MID_HEADER_SIZE(server)) {
1213 cifs_server_dbg(VFS, "SMB response too short (%u bytes)\n",
1214 server->pdu_size);
1215 cifs_reconnect(server, true);
1216 continue;
1217 }
1218
1219 /* read down to the MID */
1220 length = cifs_read_from_socket(server,
1221 buf + HEADER_PREAMBLE_SIZE(server),
1222 MID_HEADER_SIZE(server));
1223 if (length < 0)
1224 continue;
1225 server->total_read += length;
1226
1227 if (server->ops->next_header) {
1228 if (server->ops->next_header(server, buf, &next_offset)) {
1229 cifs_dbg(VFS, "%s: malformed response (next_offset=%u)\n",
1230 __func__, next_offset);
1231 cifs_reconnect(server, true);
1232 continue;
1233 }
1234 if (next_offset)
1235 server->pdu_size = next_offset;
1236 }
1237
1238 memset(mids, 0, sizeof(mids));
1239 memset(bufs, 0, sizeof(bufs));
1240 num_mids = 0;
1241
1242 if (server->ops->is_transform_hdr &&
1243 server->ops->receive_transform &&
1244 server->ops->is_transform_hdr(buf)) {
1245 length = server->ops->receive_transform(server,
1246 mids,
1247 bufs,
1248 &num_mids);
1249 } else {
1250 mids[0] = server->ops->find_mid(server, buf);
1251 bufs[0] = buf;
1252 num_mids = 1;
1253
1254 if (!mids[0] || !mids[0]->receive)
1255 length = standard_receive3(server, mids[0]);
1256 else
1257 length = mids[0]->receive(server, mids[0]);
1258 }
1259
1260 if (length < 0) {
1261 for (i = 0; i < num_mids; i++)
1262 if (mids[i])
1263 release_mid(mids[i]);
1264 continue;
1265 }
1266
1267 if (server->ops->is_status_io_timeout &&
1268 server->ops->is_status_io_timeout(buf)) {
1269 num_io_timeout++;
1270 if (num_io_timeout > MAX_STATUS_IO_TIMEOUT) {
1271 cifs_server_dbg(VFS,
1272 "Number of request timeouts exceeded %d. Reconnecting",
1273 MAX_STATUS_IO_TIMEOUT);
1274
1275 pending_reconnect = true;
1276 num_io_timeout = 0;
1277 }
1278 }
1279
1280 server->lstrp = jiffies;
1281
1282 for (i = 0; i < num_mids; i++) {
1283 if (mids[i] != NULL) {
1284 mids[i]->resp_buf_size = server->pdu_size;
1285
1286 if (bufs[i] != NULL) {
1287 if (server->ops->is_network_name_deleted &&
1288 server->ops->is_network_name_deleted(bufs[i],
1289 server)) {
1290 cifs_server_dbg(FYI,
1291 "Share deleted. Reconnect needed");
1292 }
1293 }
1294
1295 if (!mids[i]->multiRsp || mids[i]->multiEnd)
1296 mids[i]->callback(mids[i]);
1297
1298 release_mid(mids[i]);
1299 } else if (server->ops->is_oplock_break &&
1300 server->ops->is_oplock_break(bufs[i],
1301 server)) {
1302 smb2_add_credits_from_hdr(bufs[i], server);
1303 cifs_dbg(FYI, "Received oplock break\n");
1304 } else {
1305 cifs_server_dbg(VFS, "No task to wake, unknown frame received! NumMids %d\n",
1306 atomic_read(&mid_count));
1307 cifs_dump_mem("Received Data is: ", bufs[i],
1308 HEADER_SIZE(server));
1309 smb2_add_credits_from_hdr(bufs[i], server);
1310 #ifdef CONFIG_CIFS_DEBUG2
1311 if (server->ops->dump_detail)
1312 server->ops->dump_detail(bufs[i],
1313 server);
1314 cifs_dump_mids(server);
1315 #endif /* CIFS_DEBUG2 */
1316 }
1317 }
1318
1319 if (pdu_length > server->pdu_size) {
1320 if (!allocate_buffers(server))
1321 continue;
1322 pdu_length -= server->pdu_size;
1323 server->total_read = 0;
1324 server->large_buf = false;
1325 buf = server->smallbuf;
1326 goto next_pdu;
1327 }
1328
1329 /* do this reconnect at the very end after processing all MIDs */
1330 if (pending_reconnect)
1331 cifs_reconnect(server, true);
1332
1333 } /* end while !EXITING */
1334
1335 /* buffer usually freed in free_mid - need to free it here on exit */
1336 cifs_buf_release(server->bigbuf);
1337 if (server->smallbuf) /* no sense logging a debug message if NULL */
1338 cifs_small_buf_release(server->smallbuf);
1339
1340 task_to_wake = xchg(&server->tsk, NULL);
1341 clean_demultiplex_info(server);
1342
1343 /* if server->tsk was NULL then wait for a signal before exiting */
1344 if (!task_to_wake) {
1345 set_current_state(TASK_INTERRUPTIBLE);
1346 while (!signal_pending(current)) {
1347 schedule();
1348 set_current_state(TASK_INTERRUPTIBLE);
1349 }
1350 set_current_state(TASK_RUNNING);
1351 }
1352
1353 memalloc_noreclaim_restore(noreclaim_flag);
1354 module_put_and_kthread_exit(0);
1355 }
1356
1357 int
1358 cifs_ipaddr_cmp(struct sockaddr *srcaddr, struct sockaddr *rhs)
1359 {
1360 struct sockaddr_in *saddr4 = (struct sockaddr_in *)srcaddr;
1361 struct sockaddr_in *vaddr4 = (struct sockaddr_in *)rhs;
1362 struct sockaddr_in6 *saddr6 = (struct sockaddr_in6 *)srcaddr;
1363 struct sockaddr_in6 *vaddr6 = (struct sockaddr_in6 *)rhs;
1364
1365 switch (srcaddr->sa_family) {
1366 case AF_UNSPEC:
1367 switch (rhs->sa_family) {
1368 case AF_UNSPEC:
1369 return 0;
1370 case AF_INET:
1371 case AF_INET6:
1372 return 1;
1373 default:
1374 return -1;
1375 }
1376 case AF_INET: {
1377 switch (rhs->sa_family) {
1378 case AF_UNSPEC:
1379 return -1;
1380 case AF_INET:
1381 return memcmp(saddr4, vaddr4,
1382 sizeof(struct sockaddr_in));
1383 case AF_INET6:
1384 return 1;
1385 default:
1386 return -1;
1387 }
1388 }
1389 case AF_INET6: {
1390 switch (rhs->sa_family) {
1391 case AF_UNSPEC:
1392 case AF_INET:
1393 return -1;
1394 case AF_INET6:
1395 return memcmp(saddr6,
1396 vaddr6,
1397 sizeof(struct sockaddr_in6));
1398 default:
1399 return -1;
1400 }
1401 }
1402 default:
1403 return -1; /* don't expect to be here */
1404 }
1405 }
1406
1407 /*
1408 * Returns true if srcaddr isn't specified and rhs isn't specified, or
1409 * if srcaddr is specified and matches the IP address of the rhs argument
1410 */
1411 bool
1412 cifs_match_ipaddr(struct sockaddr *srcaddr, struct sockaddr *rhs)
1413 {
1414 switch (srcaddr->sa_family) {
1415 case AF_UNSPEC:
1416 return (rhs->sa_family == AF_UNSPEC);
1417 case AF_INET: {
1418 struct sockaddr_in *saddr4 = (struct sockaddr_in *)srcaddr;
1419 struct sockaddr_in *vaddr4 = (struct sockaddr_in *)rhs;
1420
1421 return (saddr4->sin_addr.s_addr == vaddr4->sin_addr.s_addr);
1422 }
1423 case AF_INET6: {
1424 struct sockaddr_in6 *saddr6 = (struct sockaddr_in6 *)srcaddr;
1425 struct sockaddr_in6 *vaddr6 = (struct sockaddr_in6 *)rhs;
1426
1427 return (ipv6_addr_equal(&saddr6->sin6_addr, &vaddr6->sin6_addr)
1428 && saddr6->sin6_scope_id == vaddr6->sin6_scope_id);
1429 }
1430 default:
1431 WARN_ON(1);
1432 return false; /* don't expect to be here */
1433 }
1434 }
1435
1436 /*
1437 * If no port is specified in addr structure, we try to match with 445 port
1438 * and if it fails - with 139 ports. It should be called only if address
1439 * families of server and addr are equal.
1440 */
1441 static bool
1442 match_port(struct TCP_Server_Info *server, struct sockaddr *addr)
1443 {
1444 __be16 port, *sport;
1445
1446 /* SMBDirect manages its own ports, don't match it here */
1447 if (server->rdma)
1448 return true;
1449
1450 switch (addr->sa_family) {
1451 case AF_INET:
1452 sport = &((struct sockaddr_in *) &server->dstaddr)->sin_port;
1453 port = ((struct sockaddr_in *) addr)->sin_port;
1454 break;
1455 case AF_INET6:
1456 sport = &((struct sockaddr_in6 *) &server->dstaddr)->sin6_port;
1457 port = ((struct sockaddr_in6 *) addr)->sin6_port;
1458 break;
1459 default:
1460 WARN_ON(1);
1461 return false;
1462 }
1463
1464 if (!port) {
1465 port = htons(CIFS_PORT);
1466 if (port == *sport)
1467 return true;
1468
1469 port = htons(RFC1001_PORT);
1470 }
1471
1472 return port == *sport;
1473 }
1474
1475 static bool match_server_address(struct TCP_Server_Info *server, struct sockaddr *addr)
1476 {
1477 if (!cifs_match_ipaddr(addr, (struct sockaddr *)&server->dstaddr))
1478 return false;
1479
1480 return true;
1481 }
1482
1483 static bool
1484 match_security(struct TCP_Server_Info *server, struct smb3_fs_context *ctx)
1485 {
1486 /*
1487 * The select_sectype function should either return the ctx->sectype
1488 * that was specified, or "Unspecified" if that sectype was not
1489 * compatible with the given NEGOTIATE request.
1490 */
1491 if (server->ops->select_sectype(server, ctx->sectype)
1492 == Unspecified)
1493 return false;
1494
1495 /*
1496 * Now check if signing mode is acceptable. No need to check
1497 * global_secflags at this point since if MUST_SIGN is set then
1498 * the server->sign had better be too.
1499 */
1500 if (ctx->sign && !server->sign)
1501 return false;
1502
1503 return true;
1504 }
1505
1506 /* this function must be called with srv_lock held */
1507 static int match_server(struct TCP_Server_Info *server,
1508 struct smb3_fs_context *ctx,
1509 bool match_super)
1510 {
1511 struct sockaddr *addr = (struct sockaddr *)&ctx->dstaddr;
1512
1513 lockdep_assert_held(&server->srv_lock);
1514
1515 if (ctx->nosharesock)
1516 return 0;
1517
1518 /* this server does not share socket */
1519 if (server->nosharesock)
1520 return 0;
1521
1522 /* If multidialect negotiation see if existing sessions match one */
1523 if (strcmp(ctx->vals->version_string, SMB3ANY_VERSION_STRING) == 0) {
1524 if (server->vals->protocol_id < SMB30_PROT_ID)
1525 return 0;
1526 } else if (strcmp(ctx->vals->version_string,
1527 SMBDEFAULT_VERSION_STRING) == 0) {
1528 if (server->vals->protocol_id < SMB21_PROT_ID)
1529 return 0;
1530 } else if ((server->vals != ctx->vals) || (server->ops != ctx->ops))
1531 return 0;
1532
1533 if (!net_eq(cifs_net_ns(server), current->nsproxy->net_ns))
1534 return 0;
1535
1536 if (!cifs_match_ipaddr((struct sockaddr *)&ctx->srcaddr,
1537 (struct sockaddr *)&server->srcaddr))
1538 return 0;
1539 /*
1540 * When matching cifs.ko superblocks (@match_super == true), we can't
1541 * really match either @server->leaf_fullpath or @server->dstaddr
1542 * directly since this @server might belong to a completely different
1543 * server -- in case of domain-based DFS referrals or DFS links -- as
1544 * provided earlier by mount(2) through 'source' and 'ip' options.
1545 *
1546 * Otherwise, match the DFS referral in @server->leaf_fullpath or the
1547 * destination address in @server->dstaddr.
1548 *
1549 * When using 'nodfs' mount option, we avoid sharing it with DFS
1550 * connections as they might failover.
1551 */
1552 if (!match_super) {
1553 if (!ctx->nodfs) {
1554 if (server->leaf_fullpath) {
1555 if (!ctx->leaf_fullpath ||
1556 strcasecmp(server->leaf_fullpath,
1557 ctx->leaf_fullpath))
1558 return 0;
1559 } else if (ctx->leaf_fullpath) {
1560 return 0;
1561 }
1562 } else if (server->leaf_fullpath) {
1563 return 0;
1564 }
1565 }
1566
1567 /*
1568 * Match for a regular connection (address/hostname/port) which has no
1569 * DFS referrals set.
1570 */
1571 if (!server->leaf_fullpath &&
1572 (strcasecmp(server->hostname, ctx->server_hostname) ||
1573 !match_server_address(server, addr) ||
1574 !match_port(server, addr)))
1575 return 0;
1576
1577 if (!match_security(server, ctx))
1578 return 0;
1579
1580 if (server->echo_interval != ctx->echo_interval * HZ)
1581 return 0;
1582
1583 if (server->rdma != ctx->rdma)
1584 return 0;
1585
1586 if (server->ignore_signature != ctx->ignore_signature)
1587 return 0;
1588
1589 if (server->min_offload != ctx->min_offload)
1590 return 0;
1591
1592 if (server->retrans != ctx->retrans)
1593 return 0;
1594
1595 return 1;
1596 }
1597
1598 struct TCP_Server_Info *
1599 cifs_find_tcp_session(struct smb3_fs_context *ctx)
1600 {
1601 struct TCP_Server_Info *server;
1602
1603 spin_lock(&cifs_tcp_ses_lock);
1604 list_for_each_entry(server, &cifs_tcp_ses_list, tcp_ses_list) {
1605 spin_lock(&server->srv_lock);
1606 /*
1607 * Skip ses channels since they're only handled in lower layers
1608 * (e.g. cifs_send_recv).
1609 */
1610 if (SERVER_IS_CHAN(server) ||
1611 !match_server(server, ctx, false)) {
1612 spin_unlock(&server->srv_lock);
1613 continue;
1614 }
1615 spin_unlock(&server->srv_lock);
1616
1617 ++server->srv_count;
1618 spin_unlock(&cifs_tcp_ses_lock);
1619 cifs_dbg(FYI, "Existing tcp session with server found\n");
1620 return server;
1621 }
1622 spin_unlock(&cifs_tcp_ses_lock);
1623 return NULL;
1624 }
1625
1626 void
1627 cifs_put_tcp_session(struct TCP_Server_Info *server, int from_reconnect)
1628 {
1629 struct task_struct *task;
1630
1631 spin_lock(&cifs_tcp_ses_lock);
1632 if (--server->srv_count > 0) {
1633 spin_unlock(&cifs_tcp_ses_lock);
1634 return;
1635 }
1636
1637 /* srv_count can never go negative */
1638 WARN_ON(server->srv_count < 0);
1639
1640 put_net(cifs_net_ns(server));
1641
1642 list_del_init(&server->tcp_ses_list);
1643 spin_unlock(&cifs_tcp_ses_lock);
1644
1645 cancel_delayed_work_sync(&server->echo);
1646
1647 if (from_reconnect)
1648 /*
1649 * Avoid deadlock here: reconnect work calls
1650 * cifs_put_tcp_session() at its end. Need to be sure
1651 * that reconnect work does nothing with server pointer after
1652 * that step.
1653 */
1654 cancel_delayed_work(&server->reconnect);
1655 else
1656 cancel_delayed_work_sync(&server->reconnect);
1657
1658 /* For secondary channels, we pick up ref-count on the primary server */
1659 if (SERVER_IS_CHAN(server))
1660 cifs_put_tcp_session(server->primary_server, from_reconnect);
1661
1662 spin_lock(&server->srv_lock);
1663 server->tcpStatus = CifsExiting;
1664 spin_unlock(&server->srv_lock);
1665
1666 cifs_crypto_secmech_release(server);
1667
1668 kfree_sensitive(server->session_key.response);
1669 server->session_key.response = NULL;
1670 server->session_key.len = 0;
1671 kfree(server->hostname);
1672 server->hostname = NULL;
1673
1674 task = xchg(&server->tsk, NULL);
1675 if (task)
1676 send_sig(SIGKILL, task, 1);
1677 }
1678
1679 struct TCP_Server_Info *
1680 cifs_get_tcp_session(struct smb3_fs_context *ctx,
1681 struct TCP_Server_Info *primary_server)
1682 {
1683 struct TCP_Server_Info *tcp_ses = NULL;
1684 int rc;
1685
1686 cifs_dbg(FYI, "UNC: %s\n", ctx->UNC);
1687
1688 /* see if we already have a matching tcp_ses */
1689 tcp_ses = cifs_find_tcp_session(ctx);
1690 if (tcp_ses)
1691 return tcp_ses;
1692
1693 tcp_ses = kzalloc(sizeof(struct TCP_Server_Info), GFP_KERNEL);
1694 if (!tcp_ses) {
1695 rc = -ENOMEM;
1696 goto out_err;
1697 }
1698
1699 tcp_ses->hostname = kstrdup(ctx->server_hostname, GFP_KERNEL);
1700 if (!tcp_ses->hostname) {
1701 rc = -ENOMEM;
1702 goto out_err;
1703 }
1704
1705 if (ctx->leaf_fullpath) {
1706 tcp_ses->leaf_fullpath = kstrdup(ctx->leaf_fullpath, GFP_KERNEL);
1707 if (!tcp_ses->leaf_fullpath) {
1708 rc = -ENOMEM;
1709 goto out_err;
1710 }
1711 }
1712
1713 if (ctx->nosharesock)
1714 tcp_ses->nosharesock = true;
1715
1716 tcp_ses->ops = ctx->ops;
1717 tcp_ses->vals = ctx->vals;
1718 cifs_set_net_ns(tcp_ses, get_net(current->nsproxy->net_ns));
1719
1720 tcp_ses->conn_id = atomic_inc_return(&tcpSesNextId);
1721 tcp_ses->noblockcnt = ctx->rootfs;
1722 tcp_ses->noblocksnd = ctx->noblocksnd || ctx->rootfs;
1723 tcp_ses->noautotune = ctx->noautotune;
1724 tcp_ses->tcp_nodelay = ctx->sockopt_tcp_nodelay;
1725 tcp_ses->rdma = ctx->rdma;
1726 tcp_ses->in_flight = 0;
1727 tcp_ses->max_in_flight = 0;
1728 tcp_ses->credits = 1;
1729 if (primary_server) {
1730 spin_lock(&cifs_tcp_ses_lock);
1731 ++primary_server->srv_count;
1732 spin_unlock(&cifs_tcp_ses_lock);
1733 tcp_ses->primary_server = primary_server;
1734 }
1735 init_waitqueue_head(&tcp_ses->response_q);
1736 init_waitqueue_head(&tcp_ses->request_q);
1737 INIT_LIST_HEAD(&tcp_ses->pending_mid_q);
1738 mutex_init(&tcp_ses->_srv_mutex);
1739 memcpy(tcp_ses->workstation_RFC1001_name,
1740 ctx->source_rfc1001_name, RFC1001_NAME_LEN_WITH_NULL);
1741 memcpy(tcp_ses->server_RFC1001_name,
1742 ctx->target_rfc1001_name, RFC1001_NAME_LEN_WITH_NULL);
1743 tcp_ses->session_estab = false;
1744 tcp_ses->sequence_number = 0;
1745 tcp_ses->channel_sequence_num = 0; /* only tracked for primary channel */
1746 tcp_ses->reconnect_instance = 1;
1747 tcp_ses->lstrp = jiffies;
1748 tcp_ses->compression.requested = ctx->compress;
1749 spin_lock_init(&tcp_ses->req_lock);
1750 spin_lock_init(&tcp_ses->srv_lock);
1751 spin_lock_init(&tcp_ses->mid_lock);
1752 INIT_LIST_HEAD(&tcp_ses->tcp_ses_list);
1753 INIT_LIST_HEAD(&tcp_ses->smb_ses_list);
1754 INIT_DELAYED_WORK(&tcp_ses->echo, cifs_echo_request);
1755 INIT_DELAYED_WORK(&tcp_ses->reconnect, smb2_reconnect_server);
1756 mutex_init(&tcp_ses->reconnect_mutex);
1757 #ifdef CONFIG_CIFS_DFS_UPCALL
1758 mutex_init(&tcp_ses->refpath_lock);
1759 #endif
1760 memcpy(&tcp_ses->srcaddr, &ctx->srcaddr,
1761 sizeof(tcp_ses->srcaddr));
1762 memcpy(&tcp_ses->dstaddr, &ctx->dstaddr,
1763 sizeof(tcp_ses->dstaddr));
1764 if (ctx->use_client_guid)
1765 memcpy(tcp_ses->client_guid, ctx->client_guid,
1766 SMB2_CLIENT_GUID_SIZE);
1767 else
1768 generate_random_uuid(tcp_ses->client_guid);
1769 /*
1770 * at this point we are the only ones with the pointer
1771 * to the struct since the kernel thread not created yet
1772 * no need to spinlock this init of tcpStatus or srv_count
1773 */
1774 tcp_ses->tcpStatus = CifsNew;
1775 ++tcp_ses->srv_count;
1776
1777 if (ctx->echo_interval >= SMB_ECHO_INTERVAL_MIN &&
1778 ctx->echo_interval <= SMB_ECHO_INTERVAL_MAX)
1779 tcp_ses->echo_interval = ctx->echo_interval * HZ;
1780 else
1781 tcp_ses->echo_interval = SMB_ECHO_INTERVAL_DEFAULT * HZ;
1782 if (tcp_ses->rdma) {
1783 #ifndef CONFIG_CIFS_SMB_DIRECT
1784 cifs_dbg(VFS, "CONFIG_CIFS_SMB_DIRECT is not enabled\n");
1785 rc = -ENOENT;
1786 goto out_err_crypto_release;
1787 #endif
1788 tcp_ses->smbd_conn = smbd_get_connection(
1789 tcp_ses, (struct sockaddr *)&ctx->dstaddr);
1790 if (tcp_ses->smbd_conn) {
1791 cifs_dbg(VFS, "RDMA transport established\n");
1792 rc = 0;
1793 goto smbd_connected;
1794 } else {
1795 rc = -ENOENT;
1796 goto out_err_crypto_release;
1797 }
1798 }
1799 rc = ip_connect(tcp_ses);
1800 if (rc < 0) {
1801 cifs_dbg(VFS, "Error connecting to socket. Aborting operation.\n");
1802 goto out_err_crypto_release;
1803 }
1804 smbd_connected:
1805 /*
1806 * since we're in a cifs function already, we know that
1807 * this will succeed. No need for try_module_get().
1808 */
1809 __module_get(THIS_MODULE);
1810 tcp_ses->tsk = kthread_run(cifs_demultiplex_thread,
1811 tcp_ses, "cifsd");
1812 if (IS_ERR(tcp_ses->tsk)) {
1813 rc = PTR_ERR(tcp_ses->tsk);
1814 cifs_dbg(VFS, "error %d create cifsd thread\n", rc);
1815 module_put(THIS_MODULE);
1816 goto out_err_crypto_release;
1817 }
1818 tcp_ses->min_offload = ctx->min_offload;
1819 tcp_ses->retrans = ctx->retrans;
1820 /*
1821 * at this point we are the only ones with the pointer
1822 * to the struct since the kernel thread not created yet
1823 * no need to spinlock this update of tcpStatus
1824 */
1825 spin_lock(&tcp_ses->srv_lock);
1826 tcp_ses->tcpStatus = CifsNeedNegotiate;
1827 spin_unlock(&tcp_ses->srv_lock);
1828
1829 if ((ctx->max_credits < 20) || (ctx->max_credits > 60000))
1830 tcp_ses->max_credits = SMB2_MAX_CREDITS_AVAILABLE;
1831 else
1832 tcp_ses->max_credits = ctx->max_credits;
1833
1834 tcp_ses->nr_targets = 1;
1835 tcp_ses->ignore_signature = ctx->ignore_signature;
1836 /* thread spawned, put it on the list */
1837 spin_lock(&cifs_tcp_ses_lock);
1838 list_add(&tcp_ses->tcp_ses_list, &cifs_tcp_ses_list);
1839 spin_unlock(&cifs_tcp_ses_lock);
1840
1841 /* queue echo request delayed work */
1842 queue_delayed_work(cifsiod_wq, &tcp_ses->echo, tcp_ses->echo_interval);
1843
1844 return tcp_ses;
1845
1846 out_err_crypto_release:
1847 cifs_crypto_secmech_release(tcp_ses);
1848
1849 put_net(cifs_net_ns(tcp_ses));
1850
1851 out_err:
1852 if (tcp_ses) {
1853 if (SERVER_IS_CHAN(tcp_ses))
1854 cifs_put_tcp_session(tcp_ses->primary_server, false);
1855 kfree(tcp_ses->hostname);
1856 kfree(tcp_ses->leaf_fullpath);
1857 if (tcp_ses->ssocket)
1858 sock_release(tcp_ses->ssocket);
1859 kfree(tcp_ses);
1860 }
1861 return ERR_PTR(rc);
1862 }
1863
1864 /* this function must be called with ses_lock and chan_lock held */
1865 static int match_session(struct cifs_ses *ses, struct smb3_fs_context *ctx)
1866 {
1867 if (ctx->sectype != Unspecified &&
1868 ctx->sectype != ses->sectype)
1869 return 0;
1870
1871 if (ctx->dfs_root_ses != ses->dfs_root_ses)
1872 return 0;
1873
1874 /*
1875 * If an existing session is limited to less channels than
1876 * requested, it should not be reused
1877 */
1878 if (ses->chan_max < ctx->max_channels)
1879 return 0;
1880
1881 switch (ses->sectype) {
1882 case Kerberos:
1883 if (!uid_eq(ctx->cred_uid, ses->cred_uid))
1884 return 0;
1885 break;
1886 default:
1887 /* NULL username means anonymous session */
1888 if (ses->user_name == NULL) {
1889 if (!ctx->nullauth)
1890 return 0;
1891 break;
1892 }
1893
1894 /* anything else takes username/password */
1895 if (strncmp(ses->user_name,
1896 ctx->username ? ctx->username : "",
1897 CIFS_MAX_USERNAME_LEN))
1898 return 0;
1899 if ((ctx->username && strlen(ctx->username) != 0) &&
1900 ses->password != NULL &&
1901 strncmp(ses->password,
1902 ctx->password ? ctx->password : "",
1903 CIFS_MAX_PASSWORD_LEN))
1904 return 0;
1905 }
1906
1907 if (strcmp(ctx->local_nls->charset, ses->local_nls->charset))
1908 return 0;
1909
1910 return 1;
1911 }
1912
1913 /**
1914 * cifs_setup_ipc - helper to setup the IPC tcon for the session
1915 * @ses: smb session to issue the request on
1916 * @ctx: the superblock configuration context to use for building the
1917 * new tree connection for the IPC (interprocess communication RPC)
1918 *
1919 * A new IPC connection is made and stored in the session
1920 * tcon_ipc. The IPC tcon has the same lifetime as the session.
1921 */
1922 static int
1923 cifs_setup_ipc(struct cifs_ses *ses, struct smb3_fs_context *ctx)
1924 {
1925 int rc = 0, xid;
1926 struct cifs_tcon *tcon;
1927 char unc[SERVER_NAME_LENGTH + sizeof("//x/IPC$")] = {0};
1928 bool seal = false;
1929 struct TCP_Server_Info *server = ses->server;
1930
1931 /*
1932 * If the mount request that resulted in the creation of the
1933 * session requires encryption, force IPC to be encrypted too.
1934 */
1935 if (ctx->seal) {
1936 if (server->capabilities & SMB2_GLOBAL_CAP_ENCRYPTION)
1937 seal = true;
1938 else {
1939 cifs_server_dbg(VFS,
1940 "IPC: server doesn't support encryption\n");
1941 return -EOPNOTSUPP;
1942 }
1943 }
1944
1945 /* no need to setup directory caching on IPC share, so pass in false */
1946 tcon = tcon_info_alloc(false, netfs_trace_tcon_ref_new_ipc);
1947 if (tcon == NULL)
1948 return -ENOMEM;
1949
1950 spin_lock(&server->srv_lock);
1951 scnprintf(unc, sizeof(unc), "\\\\%s\\IPC$", server->hostname);
1952 spin_unlock(&server->srv_lock);
1953
1954 xid = get_xid();
1955 tcon->ses = ses;
1956 tcon->ipc = true;
1957 tcon->seal = seal;
1958 rc = server->ops->tree_connect(xid, ses, unc, tcon, ctx->local_nls);
1959 free_xid(xid);
1960
1961 if (rc) {
1962 cifs_server_dbg(VFS, "failed to connect to IPC (rc=%d)\n", rc);
1963 tconInfoFree(tcon, netfs_trace_tcon_ref_free_ipc_fail);
1964 goto out;
1965 }
1966
1967 cifs_dbg(FYI, "IPC tcon rc=%d ipc tid=0x%x\n", rc, tcon->tid);
1968
1969 spin_lock(&tcon->tc_lock);
1970 tcon->status = TID_GOOD;
1971 spin_unlock(&tcon->tc_lock);
1972 ses->tcon_ipc = tcon;
1973 out:
1974 return rc;
1975 }
1976
1977 static struct cifs_ses *
1978 cifs_find_smb_ses(struct TCP_Server_Info *server, struct smb3_fs_context *ctx)
1979 {
1980 struct cifs_ses *ses, *ret = NULL;
1981
1982 spin_lock(&cifs_tcp_ses_lock);
1983 list_for_each_entry(ses, &server->smb_ses_list, smb_ses_list) {
1984 spin_lock(&ses->ses_lock);
1985 if (ses->ses_status == SES_EXITING) {
1986 spin_unlock(&ses->ses_lock);
1987 continue;
1988 }
1989 spin_lock(&ses->chan_lock);
1990 if (match_session(ses, ctx)) {
1991 spin_unlock(&ses->chan_lock);
1992 spin_unlock(&ses->ses_lock);
1993 ret = ses;
1994 break;
1995 }
1996 spin_unlock(&ses->chan_lock);
1997 spin_unlock(&ses->ses_lock);
1998 }
1999 if (ret)
2000 cifs_smb_ses_inc_refcount(ret);
2001 spin_unlock(&cifs_tcp_ses_lock);
2002 return ret;
2003 }
2004
2005 void __cifs_put_smb_ses(struct cifs_ses *ses)
2006 {
2007 struct TCP_Server_Info *server = ses->server;
2008 struct cifs_tcon *tcon;
2009 unsigned int xid;
2010 size_t i;
2011 bool do_logoff;
2012 int rc;
2013
2014 spin_lock(&cifs_tcp_ses_lock);
2015 spin_lock(&ses->ses_lock);
2016 cifs_dbg(FYI, "%s: id=0x%llx ses_count=%d ses_status=%u ipc=%s\n",
2017 __func__, ses->Suid, ses->ses_count, ses->ses_status,
2018 ses->tcon_ipc ? ses->tcon_ipc->tree_name : "none");
2019 if (ses->ses_status == SES_EXITING || --ses->ses_count > 0) {
2020 spin_unlock(&ses->ses_lock);
2021 spin_unlock(&cifs_tcp_ses_lock);
2022 return;
2023 }
2024 /* ses_count can never go negative */
2025 WARN_ON(ses->ses_count < 0);
2026
2027 spin_lock(&ses->chan_lock);
2028 cifs_chan_clear_need_reconnect(ses, server);
2029 spin_unlock(&ses->chan_lock);
2030
2031 do_logoff = ses->ses_status == SES_GOOD && server->ops->logoff;
2032 ses->ses_status = SES_EXITING;
2033 tcon = ses->tcon_ipc;
2034 ses->tcon_ipc = NULL;
2035 spin_unlock(&ses->ses_lock);
2036 spin_unlock(&cifs_tcp_ses_lock);
2037
2038 /*
2039 * On session close, the IPC is closed and the server must release all
2040 * tcons of the session. No need to send a tree disconnect here.
2041 *
2042 * Besides, it will make the server to not close durable and resilient
2043 * files on session close, as specified in MS-SMB2 3.3.5.6 Receiving an
2044 * SMB2 LOGOFF Request.
2045 */
2046 tconInfoFree(tcon, netfs_trace_tcon_ref_free_ipc);
2047 if (do_logoff) {
2048 xid = get_xid();
2049 rc = server->ops->logoff(xid, ses);
2050 if (rc)
2051 cifs_server_dbg(VFS, "%s: Session Logoff failure rc=%d\n",
2052 __func__, rc);
2053 _free_xid(xid);
2054 }
2055
2056 spin_lock(&cifs_tcp_ses_lock);
2057 list_del_init(&ses->smb_ses_list);
2058 spin_unlock(&cifs_tcp_ses_lock);
2059
2060 /* close any extra channels */
2061 for (i = 1; i < ses->chan_count; i++) {
2062 if (ses->chans[i].iface) {
2063 kref_put(&ses->chans[i].iface->refcount, release_iface);
2064 ses->chans[i].iface = NULL;
2065 }
2066 cifs_put_tcp_session(ses->chans[i].server, 0);
2067 ses->chans[i].server = NULL;
2068 }
2069
2070 /* we now account for primary channel in iface->refcount */
2071 if (ses->chans[0].iface) {
2072 kref_put(&ses->chans[0].iface->refcount, release_iface);
2073 ses->chans[0].server = NULL;
2074 }
2075
2076 sesInfoFree(ses);
2077 cifs_put_tcp_session(server, 0);
2078 }
2079
2080 #ifdef CONFIG_KEYS
2081
2082 /* strlen("cifs:a:") + CIFS_MAX_DOMAINNAME_LEN + 1 */
2083 #define CIFSCREDS_DESC_SIZE (7 + CIFS_MAX_DOMAINNAME_LEN + 1)
2084
2085 /* Populate username and pw fields from keyring if possible */
2086 static int
2087 cifs_set_cifscreds(struct smb3_fs_context *ctx, struct cifs_ses *ses)
2088 {
2089 int rc = 0;
2090 int is_domain = 0;
2091 const char *delim, *payload;
2092 char *desc;
2093 ssize_t len;
2094 struct key *key;
2095 struct TCP_Server_Info *server = ses->server;
2096 struct sockaddr_in *sa;
2097 struct sockaddr_in6 *sa6;
2098 const struct user_key_payload *upayload;
2099
2100 desc = kmalloc(CIFSCREDS_DESC_SIZE, GFP_KERNEL);
2101 if (!desc)
2102 return -ENOMEM;
2103
2104 /* try to find an address key first */
2105 switch (server->dstaddr.ss_family) {
2106 case AF_INET:
2107 sa = (struct sockaddr_in *)&server->dstaddr;
2108 sprintf(desc, "cifs:a:%pI4", &sa->sin_addr.s_addr);
2109 break;
2110 case AF_INET6:
2111 sa6 = (struct sockaddr_in6 *)&server->dstaddr;
2112 sprintf(desc, "cifs:a:%pI6c", &sa6->sin6_addr.s6_addr);
2113 break;
2114 default:
2115 cifs_dbg(FYI, "Bad ss_family (%hu)\n",
2116 server->dstaddr.ss_family);
2117 rc = -EINVAL;
2118 goto out_err;
2119 }
2120
2121 cifs_dbg(FYI, "%s: desc=%s\n", __func__, desc);
2122 key = request_key(&key_type_logon, desc, "");
2123 if (IS_ERR(key)) {
2124 if (!ses->domainName) {
2125 cifs_dbg(FYI, "domainName is NULL\n");
2126 rc = PTR_ERR(key);
2127 goto out_err;
2128 }
2129
2130 /* didn't work, try to find a domain key */
2131 sprintf(desc, "cifs:d:%s", ses->domainName);
2132 cifs_dbg(FYI, "%s: desc=%s\n", __func__, desc);
2133 key = request_key(&key_type_logon, desc, "");
2134 if (IS_ERR(key)) {
2135 rc = PTR_ERR(key);
2136 goto out_err;
2137 }
2138 is_domain = 1;
2139 }
2140
2141 down_read(&key->sem);
2142 upayload = user_key_payload_locked(key);
2143 if (IS_ERR_OR_NULL(upayload)) {
2144 rc = upayload ? PTR_ERR(upayload) : -EINVAL;
2145 goto out_key_put;
2146 }
2147
2148 /* find first : in payload */
2149 payload = upayload->data;
2150 delim = strnchr(payload, upayload->datalen, ':');
2151 cifs_dbg(FYI, "payload=%s\n", payload);
2152 if (!delim) {
2153 cifs_dbg(FYI, "Unable to find ':' in payload (datalen=%d)\n",
2154 upayload->datalen);
2155 rc = -EINVAL;
2156 goto out_key_put;
2157 }
2158
2159 len = delim - payload;
2160 if (len > CIFS_MAX_USERNAME_LEN || len <= 0) {
2161 cifs_dbg(FYI, "Bad value from username search (len=%zd)\n",
2162 len);
2163 rc = -EINVAL;
2164 goto out_key_put;
2165 }
2166
2167 ctx->username = kstrndup(payload, len, GFP_KERNEL);
2168 if (!ctx->username) {
2169 cifs_dbg(FYI, "Unable to allocate %zd bytes for username\n",
2170 len);
2171 rc = -ENOMEM;
2172 goto out_key_put;
2173 }
2174 cifs_dbg(FYI, "%s: username=%s\n", __func__, ctx->username);
2175
2176 len = key->datalen - (len + 1);
2177 if (len > CIFS_MAX_PASSWORD_LEN || len <= 0) {
2178 cifs_dbg(FYI, "Bad len for password search (len=%zd)\n", len);
2179 rc = -EINVAL;
2180 kfree(ctx->username);
2181 ctx->username = NULL;
2182 goto out_key_put;
2183 }
2184
2185 ++delim;
2186 /* BB consider adding support for password2 (Key Rotation) for multiuser in future */
2187 ctx->password = kstrndup(delim, len, GFP_KERNEL);
2188 if (!ctx->password) {
2189 cifs_dbg(FYI, "Unable to allocate %zd bytes for password\n",
2190 len);
2191 rc = -ENOMEM;
2192 kfree(ctx->username);
2193 ctx->username = NULL;
2194 goto out_key_put;
2195 }
2196
2197 /*
2198 * If we have a domain key then we must set the domainName in the
2199 * for the request.
2200 */
2201 if (is_domain && ses->domainName) {
2202 ctx->domainname = kstrdup(ses->domainName, GFP_KERNEL);
2203 if (!ctx->domainname) {
2204 cifs_dbg(FYI, "Unable to allocate %zd bytes for domain\n",
2205 len);
2206 rc = -ENOMEM;
2207 kfree(ctx->username);
2208 ctx->username = NULL;
2209 kfree_sensitive(ctx->password);
2210 /* no need to free ctx->password2 since not allocated in this path */
2211 ctx->password = NULL;
2212 goto out_key_put;
2213 }
2214 }
2215
2216 strscpy(ctx->workstation_name, ses->workstation_name, sizeof(ctx->workstation_name));
2217
2218 out_key_put:
2219 up_read(&key->sem);
2220 key_put(key);
2221 out_err:
2222 kfree(desc);
2223 cifs_dbg(FYI, "%s: returning %d\n", __func__, rc);
2224 return rc;
2225 }
2226 #else /* ! CONFIG_KEYS */
2227 static inline int
2228 cifs_set_cifscreds(struct smb3_fs_context *ctx __attribute__((unused)),
2229 struct cifs_ses *ses __attribute__((unused)))
2230 {
2231 return -ENOSYS;
2232 }
2233 #endif /* CONFIG_KEYS */
2234
2235 /**
2236 * cifs_get_smb_ses - get a session matching @ctx data from @server
2237 * @server: server to setup the session to
2238 * @ctx: superblock configuration context to use to setup the session
2239 *
2240 * This function assumes it is being called from cifs_mount() where we
2241 * already got a server reference (server refcount +1). See
2242 * cifs_get_tcon() for refcount explanations.
2243 */
2244 struct cifs_ses *
2245 cifs_get_smb_ses(struct TCP_Server_Info *server, struct smb3_fs_context *ctx)
2246 {
2247 int rc = 0;
2248 unsigned int xid;
2249 struct cifs_ses *ses;
2250 struct sockaddr_in *addr = (struct sockaddr_in *)&server->dstaddr;
2251 struct sockaddr_in6 *addr6 = (struct sockaddr_in6 *)&server->dstaddr;
2252
2253 xid = get_xid();
2254
2255 ses = cifs_find_smb_ses(server, ctx);
2256 if (ses) {
2257 cifs_dbg(FYI, "Existing smb sess found (status=%d)\n",
2258 ses->ses_status);
2259
2260 spin_lock(&ses->chan_lock);
2261 if (cifs_chan_needs_reconnect(ses, server)) {
2262 spin_unlock(&ses->chan_lock);
2263 cifs_dbg(FYI, "Session needs reconnect\n");
2264
2265 mutex_lock(&ses->session_mutex);
2266 rc = cifs_negotiate_protocol(xid, ses, server);
2267 if (rc) {
2268 mutex_unlock(&ses->session_mutex);
2269 /* problem -- put our ses reference */
2270 cifs_put_smb_ses(ses);
2271 free_xid(xid);
2272 return ERR_PTR(rc);
2273 }
2274
2275 rc = cifs_setup_session(xid, ses, server,
2276 ctx->local_nls);
2277 if (rc) {
2278 mutex_unlock(&ses->session_mutex);
2279 /* problem -- put our reference */
2280 cifs_put_smb_ses(ses);
2281 free_xid(xid);
2282 return ERR_PTR(rc);
2283 }
2284 mutex_unlock(&ses->session_mutex);
2285
2286 spin_lock(&ses->chan_lock);
2287 }
2288 spin_unlock(&ses->chan_lock);
2289
2290 /* existing SMB ses has a server reference already */
2291 cifs_put_tcp_session(server, 0);
2292 free_xid(xid);
2293 return ses;
2294 }
2295
2296 rc = -ENOMEM;
2297
2298 cifs_dbg(FYI, "Existing smb sess not found\n");
2299 ses = sesInfoAlloc();
2300 if (ses == NULL)
2301 goto get_ses_fail;
2302
2303 /* new SMB session uses our server ref */
2304 ses->server = server;
2305 if (server->dstaddr.ss_family == AF_INET6)
2306 sprintf(ses->ip_addr, "%pI6", &addr6->sin6_addr);
2307 else
2308 sprintf(ses->ip_addr, "%pI4", &addr->sin_addr);
2309
2310 if (ctx->username) {
2311 ses->user_name = kstrdup(ctx->username, GFP_KERNEL);
2312 if (!ses->user_name)
2313 goto get_ses_fail;
2314 }
2315
2316 /* ctx->password freed at unmount */
2317 if (ctx->password) {
2318 ses->password = kstrdup(ctx->password, GFP_KERNEL);
2319 if (!ses->password)
2320 goto get_ses_fail;
2321 }
2322 /* ctx->password freed at unmount */
2323 if (ctx->password2) {
2324 ses->password2 = kstrdup(ctx->password2, GFP_KERNEL);
2325 if (!ses->password2)
2326 goto get_ses_fail;
2327 }
2328 if (ctx->domainname) {
2329 ses->domainName = kstrdup(ctx->domainname, GFP_KERNEL);
2330 if (!ses->domainName)
2331 goto get_ses_fail;
2332 }
2333
2334 strscpy(ses->workstation_name, ctx->workstation_name, sizeof(ses->workstation_name));
2335
2336 if (ctx->domainauto)
2337 ses->domainAuto = ctx->domainauto;
2338 ses->cred_uid = ctx->cred_uid;
2339 ses->linux_uid = ctx->linux_uid;
2340
2341 ses->sectype = ctx->sectype;
2342 ses->sign = ctx->sign;
2343 ses->local_nls = load_nls(ctx->local_nls->charset);
2344
2345 /* add server as first channel */
2346 spin_lock(&ses->chan_lock);
2347 ses->chans[0].server = server;
2348 ses->chan_count = 1;
2349 ses->chan_max = ctx->multichannel ? ctx->max_channels:1;
2350 ses->chans_need_reconnect = 1;
2351 spin_unlock(&ses->chan_lock);
2352
2353 mutex_lock(&ses->session_mutex);
2354 rc = cifs_negotiate_protocol(xid, ses, server);
2355 if (!rc)
2356 rc = cifs_setup_session(xid, ses, server, ctx->local_nls);
2357 mutex_unlock(&ses->session_mutex);
2358
2359 /* each channel uses a different signing key */
2360 spin_lock(&ses->chan_lock);
2361 memcpy(ses->chans[0].signkey, ses->smb3signingkey,
2362 sizeof(ses->smb3signingkey));
2363 spin_unlock(&ses->chan_lock);
2364
2365 if (rc)
2366 goto get_ses_fail;
2367
2368 /*
2369 * success, put it on the list and add it as first channel
2370 * note: the session becomes active soon after this. So you'll
2371 * need to lock before changing something in the session.
2372 */
2373 spin_lock(&cifs_tcp_ses_lock);
2374 if (ctx->dfs_root_ses)
2375 cifs_smb_ses_inc_refcount(ctx->dfs_root_ses);
2376 ses->dfs_root_ses = ctx->dfs_root_ses;
2377 list_add(&ses->smb_ses_list, &server->smb_ses_list);
2378 spin_unlock(&cifs_tcp_ses_lock);
2379
2380 cifs_setup_ipc(ses, ctx);
2381
2382 free_xid(xid);
2383
2384 return ses;
2385
2386 get_ses_fail:
2387 sesInfoFree(ses);
2388 free_xid(xid);
2389 return ERR_PTR(rc);
2390 }
2391
2392 /* this function must be called with tc_lock held */
2393 static int match_tcon(struct cifs_tcon *tcon, struct smb3_fs_context *ctx)
2394 {
2395 struct TCP_Server_Info *server = tcon->ses->server;
2396
2397 if (tcon->status == TID_EXITING)
2398 return 0;
2399
2400 if (tcon->origin_fullpath) {
2401 if (!ctx->source ||
2402 !dfs_src_pathname_equal(ctx->source,
2403 tcon->origin_fullpath))
2404 return 0;
2405 } else if (!server->leaf_fullpath &&
2406 strncmp(tcon->tree_name, ctx->UNC, MAX_TREE_SIZE)) {
2407 return 0;
2408 }
2409 if (tcon->seal != ctx->seal)
2410 return 0;
2411 if (tcon->snapshot_time != ctx->snapshot_time)
2412 return 0;
2413 if (tcon->handle_timeout != ctx->handle_timeout)
2414 return 0;
2415 if (tcon->no_lease != ctx->no_lease)
2416 return 0;
2417 if (tcon->nodelete != ctx->nodelete)
2418 return 0;
2419 return 1;
2420 }
2421
2422 static struct cifs_tcon *
2423 cifs_find_tcon(struct cifs_ses *ses, struct smb3_fs_context *ctx)
2424 {
2425 struct cifs_tcon *tcon;
2426
2427 spin_lock(&cifs_tcp_ses_lock);
2428 list_for_each_entry(tcon, &ses->tcon_list, tcon_list) {
2429 spin_lock(&tcon->tc_lock);
2430 if (!match_tcon(tcon, ctx)) {
2431 spin_unlock(&tcon->tc_lock);
2432 continue;
2433 }
2434 ++tcon->tc_count;
2435 trace_smb3_tcon_ref(tcon->debug_id, tcon->tc_count,
2436 netfs_trace_tcon_ref_get_find);
2437 spin_unlock(&tcon->tc_lock);
2438 spin_unlock(&cifs_tcp_ses_lock);
2439 return tcon;
2440 }
2441 spin_unlock(&cifs_tcp_ses_lock);
2442 return NULL;
2443 }
2444
2445 void
2446 cifs_put_tcon(struct cifs_tcon *tcon, enum smb3_tcon_ref_trace trace)
2447 {
2448 unsigned int xid;
2449 struct cifs_ses *ses;
2450
2451 /*
2452 * IPC tcon share the lifetime of their session and are
2453 * destroyed in the session put function
2454 */
2455 if (tcon == NULL || tcon->ipc)
2456 return;
2457
2458 ses = tcon->ses;
2459 cifs_dbg(FYI, "%s: tc_count=%d\n", __func__, tcon->tc_count);
2460 spin_lock(&cifs_tcp_ses_lock);
2461 spin_lock(&tcon->tc_lock);
2462 trace_smb3_tcon_ref(tcon->debug_id, tcon->tc_count - 1, trace);
2463 if (--tcon->tc_count > 0) {
2464 spin_unlock(&tcon->tc_lock);
2465 spin_unlock(&cifs_tcp_ses_lock);
2466 return;
2467 }
2468
2469 /* tc_count can never go negative */
2470 WARN_ON(tcon->tc_count < 0);
2471
2472 list_del_init(&tcon->tcon_list);
2473 tcon->status = TID_EXITING;
2474 spin_unlock(&tcon->tc_lock);
2475 spin_unlock(&cifs_tcp_ses_lock);
2476
2477 /* cancel polling of interfaces */
2478 cancel_delayed_work_sync(&tcon->query_interfaces);
2479 #ifdef CONFIG_CIFS_DFS_UPCALL
2480 cancel_delayed_work_sync(&tcon->dfs_cache_work);
2481 #endif
2482
2483 if (tcon->use_witness) {
2484 int rc;
2485
2486 rc = cifs_swn_unregister(tcon);
2487 if (rc < 0) {
2488 cifs_dbg(VFS, "%s: Failed to unregister for witness notifications: %d\n",
2489 __func__, rc);
2490 }
2491 }
2492
2493 xid = get_xid();
2494 if (ses->server->ops->tree_disconnect)
2495 ses->server->ops->tree_disconnect(xid, tcon);
2496 _free_xid(xid);
2497
2498 cifs_fscache_release_super_cookie(tcon);
2499 tconInfoFree(tcon, netfs_trace_tcon_ref_free);
2500 cifs_put_smb_ses(ses);
2501 }
2502
2503 /**
2504 * cifs_get_tcon - get a tcon matching @ctx data from @ses
2505 * @ses: smb session to issue the request on
2506 * @ctx: the superblock configuration context to use for building the
2507 *
2508 * - tcon refcount is the number of mount points using the tcon.
2509 * - ses refcount is the number of tcon using the session.
2510 *
2511 * 1. This function assumes it is being called from cifs_mount() where
2512 * we already got a session reference (ses refcount +1).
2513 *
2514 * 2. Since we're in the context of adding a mount point, the end
2515 * result should be either:
2516 *
2517 * a) a new tcon already allocated with refcount=1 (1 mount point) and
2518 * its session refcount incremented (1 new tcon). This +1 was
2519 * already done in (1).
2520 *
2521 * b) an existing tcon with refcount+1 (add a mount point to it) and
2522 * identical ses refcount (no new tcon). Because of (1) we need to
2523 * decrement the ses refcount.
2524 */
2525 static struct cifs_tcon *
2526 cifs_get_tcon(struct cifs_ses *ses, struct smb3_fs_context *ctx)
2527 {
2528 struct cifs_tcon *tcon;
2529 bool nohandlecache;
2530 int rc, xid;
2531
2532 tcon = cifs_find_tcon(ses, ctx);
2533 if (tcon) {
2534 /*
2535 * tcon has refcount already incremented but we need to
2536 * decrement extra ses reference gotten by caller (case b)
2537 */
2538 cifs_dbg(FYI, "Found match on UNC path\n");
2539 cifs_put_smb_ses(ses);
2540 return tcon;
2541 }
2542
2543 if (!ses->server->ops->tree_connect) {
2544 rc = -ENOSYS;
2545 goto out_fail;
2546 }
2547
2548 if (ses->server->dialect >= SMB20_PROT_ID &&
2549 (ses->server->capabilities & SMB2_GLOBAL_CAP_DIRECTORY_LEASING))
2550 nohandlecache = ctx->nohandlecache;
2551 else
2552 nohandlecache = true;
2553 tcon = tcon_info_alloc(!nohandlecache, netfs_trace_tcon_ref_new);
2554 if (tcon == NULL) {
2555 rc = -ENOMEM;
2556 goto out_fail;
2557 }
2558 tcon->nohandlecache = nohandlecache;
2559
2560 if (ctx->snapshot_time) {
2561 if (ses->server->vals->protocol_id == 0) {
2562 cifs_dbg(VFS,
2563 "Use SMB2 or later for snapshot mount option\n");
2564 rc = -EOPNOTSUPP;
2565 goto out_fail;
2566 } else
2567 tcon->snapshot_time = ctx->snapshot_time;
2568 }
2569
2570 if (ctx->handle_timeout) {
2571 if (ses->server->vals->protocol_id == 0) {
2572 cifs_dbg(VFS,
2573 "Use SMB2.1 or later for handle timeout option\n");
2574 rc = -EOPNOTSUPP;
2575 goto out_fail;
2576 } else
2577 tcon->handle_timeout = ctx->handle_timeout;
2578 }
2579
2580 tcon->ses = ses;
2581 if (ctx->password) {
2582 tcon->password = kstrdup(ctx->password, GFP_KERNEL);
2583 if (!tcon->password) {
2584 rc = -ENOMEM;
2585 goto out_fail;
2586 }
2587 }
2588
2589 if (ctx->seal) {
2590 if (ses->server->vals->protocol_id == 0) {
2591 cifs_dbg(VFS,
2592 "SMB3 or later required for encryption\n");
2593 rc = -EOPNOTSUPP;
2594 goto out_fail;
2595 } else if (tcon->ses->server->capabilities &
2596 SMB2_GLOBAL_CAP_ENCRYPTION)
2597 tcon->seal = true;
2598 else {
2599 cifs_dbg(VFS, "Encryption is not supported on share\n");
2600 rc = -EOPNOTSUPP;
2601 goto out_fail;
2602 }
2603 }
2604
2605 if (ctx->linux_ext) {
2606 if (ses->server->posix_ext_supported) {
2607 tcon->posix_extensions = true;
2608 pr_warn_once("SMB3.11 POSIX Extensions are experimental\n");
2609 } else if ((ses->server->vals->protocol_id == SMB311_PROT_ID) ||
2610 (strcmp(ses->server->vals->version_string,
2611 SMB3ANY_VERSION_STRING) == 0) ||
2612 (strcmp(ses->server->vals->version_string,
2613 SMBDEFAULT_VERSION_STRING) == 0)) {
2614 cifs_dbg(VFS, "Server does not support mounting with posix SMB3.11 extensions\n");
2615 rc = -EOPNOTSUPP;
2616 goto out_fail;
2617 } else if (ses->server->vals->protocol_id == SMB10_PROT_ID)
2618 if (cap_unix(ses))
2619 cifs_dbg(FYI, "Unix Extensions requested on SMB1 mount\n");
2620 else {
2621 cifs_dbg(VFS, "SMB1 Unix Extensions not supported by server\n");
2622 rc = -EOPNOTSUPP;
2623 goto out_fail;
2624 } else {
2625 cifs_dbg(VFS,
2626 "Check vers= mount option. SMB3.11 disabled but required for POSIX extensions\n");
2627 rc = -EOPNOTSUPP;
2628 goto out_fail;
2629 }
2630 }
2631
2632 xid = get_xid();
2633 rc = ses->server->ops->tree_connect(xid, ses, ctx->UNC, tcon,
2634 ctx->local_nls);
2635 free_xid(xid);
2636 cifs_dbg(FYI, "Tcon rc = %d\n", rc);
2637 if (rc)
2638 goto out_fail;
2639
2640 tcon->use_persistent = false;
2641 /* check if SMB2 or later, CIFS does not support persistent handles */
2642 if (ctx->persistent) {
2643 if (ses->server->vals->protocol_id == 0) {
2644 cifs_dbg(VFS,
2645 "SMB3 or later required for persistent handles\n");
2646 rc = -EOPNOTSUPP;
2647 goto out_fail;
2648 } else if (ses->server->capabilities &
2649 SMB2_GLOBAL_CAP_PERSISTENT_HANDLES)
2650 tcon->use_persistent = true;
2651 else /* persistent handles requested but not supported */ {
2652 cifs_dbg(VFS,
2653 "Persistent handles not supported on share\n");
2654 rc = -EOPNOTSUPP;
2655 goto out_fail;
2656 }
2657 } else if ((tcon->capabilities & SMB2_SHARE_CAP_CONTINUOUS_AVAILABILITY)
2658 && (ses->server->capabilities & SMB2_GLOBAL_CAP_PERSISTENT_HANDLES)
2659 && (ctx->nopersistent == false)) {
2660 cifs_dbg(FYI, "enabling persistent handles\n");
2661 tcon->use_persistent = true;
2662 } else if (ctx->resilient) {
2663 if (ses->server->vals->protocol_id == 0) {
2664 cifs_dbg(VFS,
2665 "SMB2.1 or later required for resilient handles\n");
2666 rc = -EOPNOTSUPP;
2667 goto out_fail;
2668 }
2669 tcon->use_resilient = true;
2670 }
2671
2672 tcon->use_witness = false;
2673 if (IS_ENABLED(CONFIG_CIFS_SWN_UPCALL) && ctx->witness) {
2674 if (ses->server->vals->protocol_id >= SMB30_PROT_ID) {
2675 if (tcon->capabilities & SMB2_SHARE_CAP_CLUSTER) {
2676 /*
2677 * Set witness in use flag in first place
2678 * to retry registration in the echo task
2679 */
2680 tcon->use_witness = true;
2681 /* And try to register immediately */
2682 rc = cifs_swn_register(tcon);
2683 if (rc < 0) {
2684 cifs_dbg(VFS, "Failed to register for witness notifications: %d\n", rc);
2685 goto out_fail;
2686 }
2687 } else {
2688 /* TODO: try to extend for non-cluster uses (eg multichannel) */
2689 cifs_dbg(VFS, "witness requested on mount but no CLUSTER capability on share\n");
2690 rc = -EOPNOTSUPP;
2691 goto out_fail;
2692 }
2693 } else {
2694 cifs_dbg(VFS, "SMB3 or later required for witness option\n");
2695 rc = -EOPNOTSUPP;
2696 goto out_fail;
2697 }
2698 }
2699
2700 /* If the user really knows what they are doing they can override */
2701 if (tcon->share_flags & SMB2_SHAREFLAG_NO_CACHING) {
2702 if (ctx->cache_ro)
2703 cifs_dbg(VFS, "cache=ro requested on mount but NO_CACHING flag set on share\n");
2704 else if (ctx->cache_rw)
2705 cifs_dbg(VFS, "cache=singleclient requested on mount but NO_CACHING flag set on share\n");
2706 }
2707
2708 if (ctx->no_lease) {
2709 if (ses->server->vals->protocol_id == 0) {
2710 cifs_dbg(VFS,
2711 "SMB2 or later required for nolease option\n");
2712 rc = -EOPNOTSUPP;
2713 goto out_fail;
2714 } else
2715 tcon->no_lease = ctx->no_lease;
2716 }
2717
2718 /*
2719 * We can have only one retry value for a connection to a share so for
2720 * resources mounted more than once to the same server share the last
2721 * value passed in for the retry flag is used.
2722 */
2723 tcon->retry = ctx->retry;
2724 tcon->nocase = ctx->nocase;
2725 tcon->broken_sparse_sup = ctx->no_sparse;
2726 tcon->max_cached_dirs = ctx->max_cached_dirs;
2727 tcon->nodelete = ctx->nodelete;
2728 tcon->local_lease = ctx->local_lease;
2729 INIT_LIST_HEAD(&tcon->pending_opens);
2730 tcon->status = TID_GOOD;
2731
2732 INIT_DELAYED_WORK(&tcon->query_interfaces,
2733 smb2_query_server_interfaces);
2734 if (ses->server->dialect >= SMB30_PROT_ID &&
2735 (ses->server->capabilities & SMB2_GLOBAL_CAP_MULTI_CHANNEL)) {
2736 /* schedule query interfaces poll */
2737 queue_delayed_work(cifsiod_wq, &tcon->query_interfaces,
2738 (SMB_INTERFACE_POLL_INTERVAL * HZ));
2739 }
2740 #ifdef CONFIG_CIFS_DFS_UPCALL
2741 INIT_DELAYED_WORK(&tcon->dfs_cache_work, dfs_cache_refresh);
2742 #endif
2743 spin_lock(&cifs_tcp_ses_lock);
2744 list_add(&tcon->tcon_list, &ses->tcon_list);
2745 spin_unlock(&cifs_tcp_ses_lock);
2746
2747 return tcon;
2748
2749 out_fail:
2750 tconInfoFree(tcon, netfs_trace_tcon_ref_free_fail);
2751 return ERR_PTR(rc);
2752 }
2753
2754 void
2755 cifs_put_tlink(struct tcon_link *tlink)
2756 {
2757 if (!tlink || IS_ERR(tlink))
2758 return;
2759
2760 if (!atomic_dec_and_test(&tlink->tl_count) ||
2761 test_bit(TCON_LINK_IN_TREE, &tlink->tl_flags)) {
2762 tlink->tl_time = jiffies;
2763 return;
2764 }
2765
2766 if (!IS_ERR(tlink_tcon(tlink)))
2767 cifs_put_tcon(tlink_tcon(tlink), netfs_trace_tcon_ref_put_tlink);
2768 kfree(tlink);
2769 }
2770
2771 static int
2772 compare_mount_options(struct super_block *sb, struct cifs_mnt_data *mnt_data)
2773 {
2774 struct cifs_sb_info *old = CIFS_SB(sb);
2775 struct cifs_sb_info *new = mnt_data->cifs_sb;
2776 unsigned int oldflags = old->mnt_cifs_flags & CIFS_MOUNT_MASK;
2777 unsigned int newflags = new->mnt_cifs_flags & CIFS_MOUNT_MASK;
2778
2779 if ((sb->s_flags & CIFS_MS_MASK) != (mnt_data->flags & CIFS_MS_MASK))
2780 return 0;
2781
2782 if (old->mnt_cifs_serverino_autodisabled)
2783 newflags &= ~CIFS_MOUNT_SERVER_INUM;
2784
2785 if (oldflags != newflags)
2786 return 0;
2787
2788 /*
2789 * We want to share sb only if we don't specify an r/wsize or
2790 * specified r/wsize is greater than or equal to existing one.
2791 */
2792 if (new->ctx->wsize && new->ctx->wsize < old->ctx->wsize)
2793 return 0;
2794
2795 if (new->ctx->rsize && new->ctx->rsize < old->ctx->rsize)
2796 return 0;
2797
2798 if (!uid_eq(old->ctx->linux_uid, new->ctx->linux_uid) ||
2799 !gid_eq(old->ctx->linux_gid, new->ctx->linux_gid))
2800 return 0;
2801
2802 if (old->ctx->file_mode != new->ctx->file_mode ||
2803 old->ctx->dir_mode != new->ctx->dir_mode)
2804 return 0;
2805
2806 if (strcmp(old->local_nls->charset, new->local_nls->charset))
2807 return 0;
2808
2809 if (old->ctx->acregmax != new->ctx->acregmax)
2810 return 0;
2811 if (old->ctx->acdirmax != new->ctx->acdirmax)
2812 return 0;
2813 if (old->ctx->closetimeo != new->ctx->closetimeo)
2814 return 0;
2815 if (old->ctx->reparse_type != new->ctx->reparse_type)
2816 return 0;
2817
2818 return 1;
2819 }
2820
2821 static int match_prepath(struct super_block *sb,
2822 struct cifs_tcon *tcon,
2823 struct cifs_mnt_data *mnt_data)
2824 {
2825 struct smb3_fs_context *ctx = mnt_data->ctx;
2826 struct cifs_sb_info *old = CIFS_SB(sb);
2827 struct cifs_sb_info *new = mnt_data->cifs_sb;
2828 bool old_set = (old->mnt_cifs_flags & CIFS_MOUNT_USE_PREFIX_PATH) &&
2829 old->prepath;
2830 bool new_set = (new->mnt_cifs_flags & CIFS_MOUNT_USE_PREFIX_PATH) &&
2831 new->prepath;
2832
2833 if (tcon->origin_fullpath &&
2834 dfs_src_pathname_equal(tcon->origin_fullpath, ctx->source))
2835 return 1;
2836
2837 if (old_set && new_set && !strcmp(new->prepath, old->prepath))
2838 return 1;
2839 else if (!old_set && !new_set)
2840 return 1;
2841
2842 return 0;
2843 }
2844
2845 int
2846 cifs_match_super(struct super_block *sb, void *data)
2847 {
2848 struct cifs_mnt_data *mnt_data = data;
2849 struct smb3_fs_context *ctx;
2850 struct cifs_sb_info *cifs_sb;
2851 struct TCP_Server_Info *tcp_srv;
2852 struct cifs_ses *ses;
2853 struct cifs_tcon *tcon;
2854 struct tcon_link *tlink;
2855 int rc = 0;
2856
2857 spin_lock(&cifs_tcp_ses_lock);
2858 cifs_sb = CIFS_SB(sb);
2859
2860 /* We do not want to use a superblock that has been shutdown */
2861 if (CIFS_MOUNT_SHUTDOWN & cifs_sb->mnt_cifs_flags) {
2862 spin_unlock(&cifs_tcp_ses_lock);
2863 return 0;
2864 }
2865
2866 tlink = cifs_get_tlink(cifs_sb_master_tlink(cifs_sb));
2867 if (IS_ERR_OR_NULL(tlink)) {
2868 pr_warn_once("%s: skip super matching due to bad tlink(%p)\n",
2869 __func__, tlink);
2870 spin_unlock(&cifs_tcp_ses_lock);
2871 return 0;
2872 }
2873 tcon = tlink_tcon(tlink);
2874 ses = tcon->ses;
2875 tcp_srv = ses->server;
2876
2877 ctx = mnt_data->ctx;
2878
2879 spin_lock(&tcp_srv->srv_lock);
2880 spin_lock(&ses->ses_lock);
2881 spin_lock(&ses->chan_lock);
2882 spin_lock(&tcon->tc_lock);
2883 if (!match_server(tcp_srv, ctx, true) ||
2884 !match_session(ses, ctx) ||
2885 !match_tcon(tcon, ctx) ||
2886 !match_prepath(sb, tcon, mnt_data)) {
2887 rc = 0;
2888 goto out;
2889 }
2890
2891 rc = compare_mount_options(sb, mnt_data);
2892 out:
2893 spin_unlock(&tcon->tc_lock);
2894 spin_unlock(&ses->chan_lock);
2895 spin_unlock(&ses->ses_lock);
2896 spin_unlock(&tcp_srv->srv_lock);
2897
2898 spin_unlock(&cifs_tcp_ses_lock);
2899 cifs_put_tlink(tlink);
2900 return rc;
2901 }
2902
2903 #ifdef CONFIG_DEBUG_LOCK_ALLOC
2904 static struct lock_class_key cifs_key[2];
2905 static struct lock_class_key cifs_slock_key[2];
2906
2907 static inline void
2908 cifs_reclassify_socket4(struct socket *sock)
2909 {
2910 struct sock *sk = sock->sk;
2911
2912 BUG_ON(!sock_allow_reclassification(sk));
2913 sock_lock_init_class_and_name(sk, "slock-AF_INET-CIFS",
2914 &cifs_slock_key[0], "sk_lock-AF_INET-CIFS", &cifs_key[0]);
2915 }
2916
2917 static inline void
2918 cifs_reclassify_socket6(struct socket *sock)
2919 {
2920 struct sock *sk = sock->sk;
2921
2922 BUG_ON(!sock_allow_reclassification(sk));
2923 sock_lock_init_class_and_name(sk, "slock-AF_INET6-CIFS",
2924 &cifs_slock_key[1], "sk_lock-AF_INET6-CIFS", &cifs_key[1]);
2925 }
2926 #else
2927 static inline void
2928 cifs_reclassify_socket4(struct socket *sock)
2929 {
2930 }
2931
2932 static inline void
2933 cifs_reclassify_socket6(struct socket *sock)
2934 {
2935 }
2936 #endif
2937
2938 /* See RFC1001 section 14 on representation of Netbios names */
2939 static void rfc1002mangle(char *target, char *source, unsigned int length)
2940 {
2941 unsigned int i, j;
2942
2943 for (i = 0, j = 0; i < (length); i++) {
2944 /* mask a nibble at a time and encode */
2945 target[j] = 'A' + (0x0F & (source[i] >> 4));
2946 target[j+1] = 'A' + (0x0F & source[i]);
2947 j += 2;
2948 }
2949
2950 }
2951
2952 static int
2953 bind_socket(struct TCP_Server_Info *server)
2954 {
2955 int rc = 0;
2956
2957 if (server->srcaddr.ss_family != AF_UNSPEC) {
2958 /* Bind to the specified local IP address */
2959 struct socket *socket = server->ssocket;
2960
2961 rc = kernel_bind(socket,
2962 (struct sockaddr *) &server->srcaddr,
2963 sizeof(server->srcaddr));
2964 if (rc < 0) {
2965 struct sockaddr_in *saddr4;
2966 struct sockaddr_in6 *saddr6;
2967
2968 saddr4 = (struct sockaddr_in *)&server->srcaddr;
2969 saddr6 = (struct sockaddr_in6 *)&server->srcaddr;
2970 if (saddr6->sin6_family == AF_INET6)
2971 cifs_server_dbg(VFS, "Failed to bind to: %pI6c, error: %d\n",
2972 &saddr6->sin6_addr, rc);
2973 else
2974 cifs_server_dbg(VFS, "Failed to bind to: %pI4, error: %d\n",
2975 &saddr4->sin_addr.s_addr, rc);
2976 }
2977 }
2978 return rc;
2979 }
2980
2981 static int
2982 ip_rfc1001_connect(struct TCP_Server_Info *server)
2983 {
2984 int rc = 0;
2985 /*
2986 * some servers require RFC1001 sessinit before sending
2987 * negprot - BB check reconnection in case where second
2988 * sessinit is sent but no second negprot
2989 */
2990 struct rfc1002_session_packet req = {};
2991 struct smb_hdr *smb_buf = (struct smb_hdr *)&req;
2992 unsigned int len;
2993
2994 req.trailer.session_req.called_len = sizeof(req.trailer.session_req.called_name);
2995
2996 if (server->server_RFC1001_name[0] != 0)
2997 rfc1002mangle(req.trailer.session_req.called_name,
2998 server->server_RFC1001_name,
2999 RFC1001_NAME_LEN_WITH_NULL);
3000 else
3001 rfc1002mangle(req.trailer.session_req.called_name,
3002 DEFAULT_CIFS_CALLED_NAME,
3003 RFC1001_NAME_LEN_WITH_NULL);
3004
3005 req.trailer.session_req.calling_len = sizeof(req.trailer.session_req.calling_name);
3006
3007 /* calling name ends in null (byte 16) from old smb convention */
3008 if (server->workstation_RFC1001_name[0] != 0)
3009 rfc1002mangle(req.trailer.session_req.calling_name,
3010 server->workstation_RFC1001_name,
3011 RFC1001_NAME_LEN_WITH_NULL);
3012 else
3013 rfc1002mangle(req.trailer.session_req.calling_name,
3014 "LINUX_CIFS_CLNT",
3015 RFC1001_NAME_LEN_WITH_NULL);
3016
3017 /*
3018 * As per rfc1002, @len must be the number of bytes that follows the
3019 * length field of a rfc1002 session request payload.
3020 */
3021 len = sizeof(req) - offsetof(struct rfc1002_session_packet, trailer.session_req);
3022
3023 smb_buf->smb_buf_length = cpu_to_be32((RFC1002_SESSION_REQUEST << 24) | len);
3024 rc = smb_send(server, smb_buf, len);
3025 /*
3026 * RFC1001 layer in at least one server requires very short break before
3027 * negprot presumably because not expecting negprot to follow so fast.
3028 * This is a simple solution that works without complicating the code
3029 * and causes no significant slowing down on mount for everyone else
3030 */
3031 usleep_range(1000, 2000);
3032
3033 return rc;
3034 }
3035
3036 static int
3037 generic_ip_connect(struct TCP_Server_Info *server)
3038 {
3039 struct sockaddr *saddr;
3040 struct socket *socket;
3041 int slen, sfamily;
3042 __be16 sport;
3043 int rc = 0;
3044
3045 saddr = (struct sockaddr *) &server->dstaddr;
3046
3047 if (server->dstaddr.ss_family == AF_INET6) {
3048 struct sockaddr_in6 *ipv6 = (struct sockaddr_in6 *)&server->dstaddr;
3049
3050 sport = ipv6->sin6_port;
3051 slen = sizeof(struct sockaddr_in6);
3052 sfamily = AF_INET6;
3053 cifs_dbg(FYI, "%s: connecting to [%pI6]:%d\n", __func__, &ipv6->sin6_addr,
3054 ntohs(sport));
3055 } else {
3056 struct sockaddr_in *ipv4 = (struct sockaddr_in *)&server->dstaddr;
3057
3058 sport = ipv4->sin_port;
3059 slen = sizeof(struct sockaddr_in);
3060 sfamily = AF_INET;
3061 cifs_dbg(FYI, "%s: connecting to %pI4:%d\n", __func__, &ipv4->sin_addr,
3062 ntohs(sport));
3063 }
3064
3065 if (server->ssocket) {
3066 socket = server->ssocket;
3067 } else {
3068 rc = __sock_create(cifs_net_ns(server), sfamily, SOCK_STREAM,
3069 IPPROTO_TCP, &server->ssocket, 1);
3070 if (rc < 0) {
3071 cifs_server_dbg(VFS, "Error %d creating socket\n", rc);
3072 return rc;
3073 }
3074
3075 /* BB other socket options to set KEEPALIVE, NODELAY? */
3076 cifs_dbg(FYI, "Socket created\n");
3077 socket = server->ssocket;
3078 socket->sk->sk_allocation = GFP_NOFS;
3079 socket->sk->sk_use_task_frag = false;
3080 if (sfamily == AF_INET6)
3081 cifs_reclassify_socket6(socket);
3082 else
3083 cifs_reclassify_socket4(socket);
3084 }
3085
3086 rc = bind_socket(server);
3087 if (rc < 0)
3088 return rc;
3089
3090 /*
3091 * Eventually check for other socket options to change from
3092 * the default. sock_setsockopt not used because it expects
3093 * user space buffer
3094 */
3095 socket->sk->sk_rcvtimeo = 7 * HZ;
3096 socket->sk->sk_sndtimeo = 5 * HZ;
3097
3098 /* make the bufsizes depend on wsize/rsize and max requests */
3099 if (server->noautotune) {
3100 if (socket->sk->sk_sndbuf < (200 * 1024))
3101 socket->sk->sk_sndbuf = 200 * 1024;
3102 if (socket->sk->sk_rcvbuf < (140 * 1024))
3103 socket->sk->sk_rcvbuf = 140 * 1024;
3104 }
3105
3106 if (server->tcp_nodelay)
3107 tcp_sock_set_nodelay(socket->sk);
3108
3109 cifs_dbg(FYI, "sndbuf %d rcvbuf %d rcvtimeo 0x%lx\n",
3110 socket->sk->sk_sndbuf,
3111 socket->sk->sk_rcvbuf, socket->sk->sk_rcvtimeo);
3112
3113 rc = kernel_connect(socket, saddr, slen,
3114 server->noblockcnt ? O_NONBLOCK : 0);
3115 /*
3116 * When mounting SMB root file systems, we do not want to block in
3117 * connect. Otherwise bail out and then let cifs_reconnect() perform
3118 * reconnect failover - if possible.
3119 */
3120 if (server->noblockcnt && rc == -EINPROGRESS)
3121 rc = 0;
3122 if (rc < 0) {
3123 cifs_dbg(FYI, "Error %d connecting to server\n", rc);
3124 trace_smb3_connect_err(server->hostname, server->conn_id, &server->dstaddr, rc);
3125 sock_release(socket);
3126 server->ssocket = NULL;
3127 return rc;
3128 }
3129 trace_smb3_connect_done(server->hostname, server->conn_id, &server->dstaddr);
3130 if (sport == htons(RFC1001_PORT))
3131 rc = ip_rfc1001_connect(server);
3132
3133 return rc;
3134 }
3135
3136 static int
3137 ip_connect(struct TCP_Server_Info *server)
3138 {
3139 __be16 *sport;
3140 struct sockaddr_in6 *addr6 = (struct sockaddr_in6 *)&server->dstaddr;
3141 struct sockaddr_in *addr = (struct sockaddr_in *)&server->dstaddr;
3142
3143 if (server->dstaddr.ss_family == AF_INET6)
3144 sport = &addr6->sin6_port;
3145 else
3146 sport = &addr->sin_port;
3147
3148 if (*sport == 0) {
3149 int rc;
3150
3151 /* try with 445 port at first */
3152 *sport = htons(CIFS_PORT);
3153
3154 rc = generic_ip_connect(server);
3155 if (rc >= 0)
3156 return rc;
3157
3158 /* if it failed, try with 139 port */
3159 *sport = htons(RFC1001_PORT);
3160 }
3161
3162 return generic_ip_connect(server);
3163 }
3164
3165 #ifdef CONFIG_CIFS_ALLOW_INSECURE_LEGACY
3166 void reset_cifs_unix_caps(unsigned int xid, struct cifs_tcon *tcon,
3167 struct cifs_sb_info *cifs_sb, struct smb3_fs_context *ctx)
3168 {
3169 /*
3170 * If we are reconnecting then should we check to see if
3171 * any requested capabilities changed locally e.g. via
3172 * remount but we can not do much about it here
3173 * if they have (even if we could detect it by the following)
3174 * Perhaps we could add a backpointer to array of sb from tcon
3175 * or if we change to make all sb to same share the same
3176 * sb as NFS - then we only have one backpointer to sb.
3177 * What if we wanted to mount the server share twice once with
3178 * and once without posixacls or posix paths?
3179 */
3180 __u64 saved_cap = le64_to_cpu(tcon->fsUnixInfo.Capability);
3181
3182 if (ctx && ctx->no_linux_ext) {
3183 tcon->fsUnixInfo.Capability = 0;
3184 tcon->unix_ext = 0; /* Unix Extensions disabled */
3185 cifs_dbg(FYI, "Linux protocol extensions disabled\n");
3186 return;
3187 } else if (ctx)
3188 tcon->unix_ext = 1; /* Unix Extensions supported */
3189
3190 if (!tcon->unix_ext) {
3191 cifs_dbg(FYI, "Unix extensions disabled so not set on reconnect\n");
3192 return;
3193 }
3194
3195 if (!CIFSSMBQFSUnixInfo(xid, tcon)) {
3196 __u64 cap = le64_to_cpu(tcon->fsUnixInfo.Capability);
3197
3198 cifs_dbg(FYI, "unix caps which server supports %lld\n", cap);
3199 /*
3200 * check for reconnect case in which we do not
3201 * want to change the mount behavior if we can avoid it
3202 */
3203 if (ctx == NULL) {
3204 /*
3205 * turn off POSIX ACL and PATHNAMES if not set
3206 * originally at mount time
3207 */
3208 if ((saved_cap & CIFS_UNIX_POSIX_ACL_CAP) == 0)
3209 cap &= ~CIFS_UNIX_POSIX_ACL_CAP;
3210 if ((saved_cap & CIFS_UNIX_POSIX_PATHNAMES_CAP) == 0) {
3211 if (cap & CIFS_UNIX_POSIX_PATHNAMES_CAP)
3212 cifs_dbg(VFS, "POSIXPATH support change\n");
3213 cap &= ~CIFS_UNIX_POSIX_PATHNAMES_CAP;
3214 } else if ((cap & CIFS_UNIX_POSIX_PATHNAMES_CAP) == 0) {
3215 cifs_dbg(VFS, "possible reconnect error\n");
3216 cifs_dbg(VFS, "server disabled POSIX path support\n");
3217 }
3218 }
3219
3220 if (cap & CIFS_UNIX_TRANSPORT_ENCRYPTION_MANDATORY_CAP)
3221 cifs_dbg(VFS, "per-share encryption not supported yet\n");
3222
3223 cap &= CIFS_UNIX_CAP_MASK;
3224 if (ctx && ctx->no_psx_acl)
3225 cap &= ~CIFS_UNIX_POSIX_ACL_CAP;
3226 else if (CIFS_UNIX_POSIX_ACL_CAP & cap) {
3227 cifs_dbg(FYI, "negotiated posix acl support\n");
3228 if (cifs_sb)
3229 cifs_sb->mnt_cifs_flags |=
3230 CIFS_MOUNT_POSIXACL;
3231 }
3232
3233 if (ctx && ctx->posix_paths == 0)
3234 cap &= ~CIFS_UNIX_POSIX_PATHNAMES_CAP;
3235 else if (cap & CIFS_UNIX_POSIX_PATHNAMES_CAP) {
3236 cifs_dbg(FYI, "negotiate posix pathnames\n");
3237 if (cifs_sb)
3238 cifs_sb->mnt_cifs_flags |=
3239 CIFS_MOUNT_POSIX_PATHS;
3240 }
3241
3242 cifs_dbg(FYI, "Negotiate caps 0x%x\n", (int)cap);
3243 #ifdef CONFIG_CIFS_DEBUG2
3244 if (cap & CIFS_UNIX_FCNTL_CAP)
3245 cifs_dbg(FYI, "FCNTL cap\n");
3246 if (cap & CIFS_UNIX_EXTATTR_CAP)
3247 cifs_dbg(FYI, "EXTATTR cap\n");
3248 if (cap & CIFS_UNIX_POSIX_PATHNAMES_CAP)
3249 cifs_dbg(FYI, "POSIX path cap\n");
3250 if (cap & CIFS_UNIX_XATTR_CAP)
3251 cifs_dbg(FYI, "XATTR cap\n");
3252 if (cap & CIFS_UNIX_POSIX_ACL_CAP)
3253 cifs_dbg(FYI, "POSIX ACL cap\n");
3254 if (cap & CIFS_UNIX_LARGE_READ_CAP)
3255 cifs_dbg(FYI, "very large read cap\n");
3256 if (cap & CIFS_UNIX_LARGE_WRITE_CAP)
3257 cifs_dbg(FYI, "very large write cap\n");
3258 if (cap & CIFS_UNIX_TRANSPORT_ENCRYPTION_CAP)
3259 cifs_dbg(FYI, "transport encryption cap\n");
3260 if (cap & CIFS_UNIX_TRANSPORT_ENCRYPTION_MANDATORY_CAP)
3261 cifs_dbg(FYI, "mandatory transport encryption cap\n");
3262 #endif /* CIFS_DEBUG2 */
3263 if (CIFSSMBSetFSUnixInfo(xid, tcon, cap)) {
3264 if (ctx == NULL)
3265 cifs_dbg(FYI, "resetting capabilities failed\n");
3266 else
3267 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");
3268
3269 }
3270 }
3271 }
3272 #endif /* CONFIG_CIFS_ALLOW_INSECURE_LEGACY */
3273
3274 int cifs_setup_cifs_sb(struct cifs_sb_info *cifs_sb)
3275 {
3276 struct smb3_fs_context *ctx = cifs_sb->ctx;
3277
3278 INIT_DELAYED_WORK(&cifs_sb->prune_tlinks, cifs_prune_tlinks);
3279
3280 spin_lock_init(&cifs_sb->tlink_tree_lock);
3281 cifs_sb->tlink_tree = RB_ROOT;
3282
3283 cifs_dbg(FYI, "file mode: %04ho dir mode: %04ho\n",
3284 ctx->file_mode, ctx->dir_mode);
3285
3286 /* this is needed for ASCII cp to Unicode converts */
3287 if (ctx->iocharset == NULL) {
3288 /* load_nls_default cannot return null */
3289 cifs_sb->local_nls = load_nls_default();
3290 } else {
3291 cifs_sb->local_nls = load_nls(ctx->iocharset);
3292 if (cifs_sb->local_nls == NULL) {
3293 cifs_dbg(VFS, "CIFS mount error: iocharset %s not found\n",
3294 ctx->iocharset);
3295 return -ELIBACC;
3296 }
3297 }
3298 ctx->local_nls = cifs_sb->local_nls;
3299
3300 smb3_update_mnt_flags(cifs_sb);
3301
3302 if (ctx->direct_io)
3303 cifs_dbg(FYI, "mounting share using direct i/o\n");
3304 if (ctx->cache_ro) {
3305 cifs_dbg(VFS, "mounting share with read only caching. Ensure that the share will not be modified while in use.\n");
3306 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_RO_CACHE;
3307 } else if (ctx->cache_rw) {
3308 cifs_dbg(VFS, "mounting share in single client RW caching mode. Ensure that no other systems will be accessing the share.\n");
3309 cifs_sb->mnt_cifs_flags |= (CIFS_MOUNT_RO_CACHE |
3310 CIFS_MOUNT_RW_CACHE);
3311 }
3312
3313 if ((ctx->cifs_acl) && (ctx->dynperm))
3314 cifs_dbg(VFS, "mount option dynperm ignored if cifsacl mount option supported\n");
3315
3316 if (ctx->prepath) {
3317 cifs_sb->prepath = kstrdup(ctx->prepath, GFP_KERNEL);
3318 if (cifs_sb->prepath == NULL)
3319 return -ENOMEM;
3320 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_USE_PREFIX_PATH;
3321 }
3322
3323 return 0;
3324 }
3325
3326 /* Release all succeed connections */
3327 void cifs_mount_put_conns(struct cifs_mount_ctx *mnt_ctx)
3328 {
3329 int rc = 0;
3330
3331 if (mnt_ctx->tcon)
3332 cifs_put_tcon(mnt_ctx->tcon, netfs_trace_tcon_ref_put_mnt_ctx);
3333 else if (mnt_ctx->ses)
3334 cifs_put_smb_ses(mnt_ctx->ses);
3335 else if (mnt_ctx->server)
3336 cifs_put_tcp_session(mnt_ctx->server, 0);
3337 mnt_ctx->ses = NULL;
3338 mnt_ctx->tcon = NULL;
3339 mnt_ctx->server = NULL;
3340 mnt_ctx->cifs_sb->mnt_cifs_flags &= ~CIFS_MOUNT_POSIX_PATHS;
3341 free_xid(mnt_ctx->xid);
3342 }
3343
3344 int cifs_mount_get_session(struct cifs_mount_ctx *mnt_ctx)
3345 {
3346 struct TCP_Server_Info *server = NULL;
3347 struct smb3_fs_context *ctx;
3348 struct cifs_ses *ses = NULL;
3349 unsigned int xid;
3350 int rc = 0;
3351
3352 xid = get_xid();
3353
3354 if (WARN_ON_ONCE(!mnt_ctx || !mnt_ctx->fs_ctx)) {
3355 rc = -EINVAL;
3356 goto out;
3357 }
3358 ctx = mnt_ctx->fs_ctx;
3359
3360 /* get a reference to a tcp session */
3361 server = cifs_get_tcp_session(ctx, NULL);
3362 if (IS_ERR(server)) {
3363 rc = PTR_ERR(server);
3364 server = NULL;
3365 goto out;
3366 }
3367
3368 /* get a reference to a SMB session */
3369 ses = cifs_get_smb_ses(server, ctx);
3370 if (IS_ERR(ses)) {
3371 rc = PTR_ERR(ses);
3372 ses = NULL;
3373 goto out;
3374 }
3375
3376 if ((ctx->persistent == true) && (!(ses->server->capabilities &
3377 SMB2_GLOBAL_CAP_PERSISTENT_HANDLES))) {
3378 cifs_server_dbg(VFS, "persistent handles not supported by server\n");
3379 rc = -EOPNOTSUPP;
3380 }
3381
3382 out:
3383 mnt_ctx->xid = xid;
3384 mnt_ctx->server = server;
3385 mnt_ctx->ses = ses;
3386 mnt_ctx->tcon = NULL;
3387
3388 return rc;
3389 }
3390
3391 int cifs_mount_get_tcon(struct cifs_mount_ctx *mnt_ctx)
3392 {
3393 struct TCP_Server_Info *server;
3394 struct cifs_sb_info *cifs_sb;
3395 struct smb3_fs_context *ctx;
3396 struct cifs_tcon *tcon = NULL;
3397 int rc = 0;
3398
3399 if (WARN_ON_ONCE(!mnt_ctx || !mnt_ctx->server || !mnt_ctx->ses || !mnt_ctx->fs_ctx ||
3400 !mnt_ctx->cifs_sb)) {
3401 rc = -EINVAL;
3402 goto out;
3403 }
3404 server = mnt_ctx->server;
3405 ctx = mnt_ctx->fs_ctx;
3406 cifs_sb = mnt_ctx->cifs_sb;
3407
3408 /* search for existing tcon to this server share */
3409 tcon = cifs_get_tcon(mnt_ctx->ses, ctx);
3410 if (IS_ERR(tcon)) {
3411 rc = PTR_ERR(tcon);
3412 tcon = NULL;
3413 goto out;
3414 }
3415
3416 /* if new SMB3.11 POSIX extensions are supported do not remap / and \ */
3417 if (tcon->posix_extensions)
3418 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_POSIX_PATHS;
3419
3420 #ifdef CONFIG_CIFS_ALLOW_INSECURE_LEGACY
3421 /* tell server which Unix caps we support */
3422 if (cap_unix(tcon->ses)) {
3423 /*
3424 * reset of caps checks mount to see if unix extensions disabled
3425 * for just this mount.
3426 */
3427 reset_cifs_unix_caps(mnt_ctx->xid, tcon, cifs_sb, ctx);
3428 spin_lock(&tcon->ses->server->srv_lock);
3429 if ((tcon->ses->server->tcpStatus == CifsNeedReconnect) &&
3430 (le64_to_cpu(tcon->fsUnixInfo.Capability) &
3431 CIFS_UNIX_TRANSPORT_ENCRYPTION_MANDATORY_CAP)) {
3432 spin_unlock(&tcon->ses->server->srv_lock);
3433 rc = -EACCES;
3434 goto out;
3435 }
3436 spin_unlock(&tcon->ses->server->srv_lock);
3437 } else
3438 #endif /* CONFIG_CIFS_ALLOW_INSECURE_LEGACY */
3439 tcon->unix_ext = 0; /* server does not support them */
3440
3441 /* do not care if a following call succeed - informational */
3442 if (!tcon->pipe && server->ops->qfs_tcon) {
3443 server->ops->qfs_tcon(mnt_ctx->xid, tcon, cifs_sb);
3444 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_RO_CACHE) {
3445 if (tcon->fsDevInfo.DeviceCharacteristics &
3446 cpu_to_le32(FILE_READ_ONLY_DEVICE))
3447 cifs_dbg(VFS, "mounted to read only share\n");
3448 else if ((cifs_sb->mnt_cifs_flags &
3449 CIFS_MOUNT_RW_CACHE) == 0)
3450 cifs_dbg(VFS, "read only mount of RW share\n");
3451 /* no need to log a RW mount of a typical RW share */
3452 }
3453 }
3454
3455 /*
3456 * Clamp the rsize/wsize mount arguments if they are too big for the server
3457 * and set the rsize/wsize to the negotiated values if not passed in by
3458 * the user on mount
3459 */
3460 if ((cifs_sb->ctx->wsize == 0) ||
3461 (cifs_sb->ctx->wsize > server->ops->negotiate_wsize(tcon, ctx))) {
3462 cifs_sb->ctx->wsize =
3463 round_down(server->ops->negotiate_wsize(tcon, ctx), PAGE_SIZE);
3464 /*
3465 * in the very unlikely event that the server sent a max write size under PAGE_SIZE,
3466 * (which would get rounded down to 0) then reset wsize to absolute minimum eg 4096
3467 */
3468 if (cifs_sb->ctx->wsize == 0) {
3469 cifs_sb->ctx->wsize = PAGE_SIZE;
3470 cifs_dbg(VFS, "wsize too small, reset to minimum ie PAGE_SIZE, usually 4096\n");
3471 }
3472 }
3473 if ((cifs_sb->ctx->rsize == 0) ||
3474 (cifs_sb->ctx->rsize > server->ops->negotiate_rsize(tcon, ctx)))
3475 cifs_sb->ctx->rsize = server->ops->negotiate_rsize(tcon, ctx);
3476
3477 /*
3478 * The cookie is initialized from volume info returned above.
3479 * Inside cifs_fscache_get_super_cookie it checks
3480 * that we do not get super cookie twice.
3481 */
3482 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_FSCACHE)
3483 cifs_fscache_get_super_cookie(tcon);
3484
3485 out:
3486 mnt_ctx->tcon = tcon;
3487 return rc;
3488 }
3489
3490 static int mount_setup_tlink(struct cifs_sb_info *cifs_sb, struct cifs_ses *ses,
3491 struct cifs_tcon *tcon)
3492 {
3493 struct tcon_link *tlink;
3494
3495 /* hang the tcon off of the superblock */
3496 tlink = kzalloc(sizeof(*tlink), GFP_KERNEL);
3497 if (tlink == NULL)
3498 return -ENOMEM;
3499
3500 tlink->tl_uid = ses->linux_uid;
3501 tlink->tl_tcon = tcon;
3502 tlink->tl_time = jiffies;
3503 set_bit(TCON_LINK_MASTER, &tlink->tl_flags);
3504 set_bit(TCON_LINK_IN_TREE, &tlink->tl_flags);
3505
3506 cifs_sb->master_tlink = tlink;
3507 spin_lock(&cifs_sb->tlink_tree_lock);
3508 tlink_rb_insert(&cifs_sb->tlink_tree, tlink);
3509 spin_unlock(&cifs_sb->tlink_tree_lock);
3510
3511 queue_delayed_work(cifsiod_wq, &cifs_sb->prune_tlinks,
3512 TLINK_IDLE_EXPIRE);
3513 return 0;
3514 }
3515
3516 static int
3517 cifs_are_all_path_components_accessible(struct TCP_Server_Info *server,
3518 unsigned int xid,
3519 struct cifs_tcon *tcon,
3520 struct cifs_sb_info *cifs_sb,
3521 char *full_path,
3522 int added_treename)
3523 {
3524 int rc;
3525 char *s;
3526 char sep, tmp;
3527 int skip = added_treename ? 1 : 0;
3528
3529 sep = CIFS_DIR_SEP(cifs_sb);
3530 s = full_path;
3531
3532 rc = server->ops->is_path_accessible(xid, tcon, cifs_sb, "");
3533 while (rc == 0) {
3534 /* skip separators */
3535 while (*s == sep)
3536 s++;
3537 if (!*s)
3538 break;
3539 /* next separator */
3540 while (*s && *s != sep)
3541 s++;
3542 /*
3543 * if the treename is added, we then have to skip the first
3544 * part within the separators
3545 */
3546 if (skip) {
3547 skip = 0;
3548 continue;
3549 }
3550 /*
3551 * temporarily null-terminate the path at the end of
3552 * the current component
3553 */
3554 tmp = *s;
3555 *s = 0;
3556 rc = server->ops->is_path_accessible(xid, tcon, cifs_sb,
3557 full_path);
3558 *s = tmp;
3559 }
3560 return rc;
3561 }
3562
3563 /*
3564 * Check if path is remote (i.e. a DFS share).
3565 *
3566 * Return -EREMOTE if it is, otherwise 0 or -errno.
3567 */
3568 int cifs_is_path_remote(struct cifs_mount_ctx *mnt_ctx)
3569 {
3570 int rc;
3571 struct cifs_sb_info *cifs_sb = mnt_ctx->cifs_sb;
3572 struct TCP_Server_Info *server = mnt_ctx->server;
3573 unsigned int xid = mnt_ctx->xid;
3574 struct cifs_tcon *tcon = mnt_ctx->tcon;
3575 struct smb3_fs_context *ctx = mnt_ctx->fs_ctx;
3576 char *full_path;
3577
3578 if (!server->ops->is_path_accessible)
3579 return -EOPNOTSUPP;
3580
3581 /*
3582 * cifs_build_path_to_root works only when we have a valid tcon
3583 */
3584 full_path = cifs_build_path_to_root(ctx, cifs_sb, tcon,
3585 tcon->Flags & SMB_SHARE_IS_IN_DFS);
3586 if (full_path == NULL)
3587 return -ENOMEM;
3588
3589 cifs_dbg(FYI, "%s: full_path: %s\n", __func__, full_path);
3590
3591 rc = server->ops->is_path_accessible(xid, tcon, cifs_sb,
3592 full_path);
3593 if (rc != 0 && rc != -EREMOTE)
3594 goto out;
3595
3596 if (rc != -EREMOTE) {
3597 rc = cifs_are_all_path_components_accessible(server, xid, tcon,
3598 cifs_sb, full_path, tcon->Flags & SMB_SHARE_IS_IN_DFS);
3599 if (rc != 0) {
3600 cifs_server_dbg(VFS, "cannot query dirs between root and final path, enabling CIFS_MOUNT_USE_PREFIX_PATH\n");
3601 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_USE_PREFIX_PATH;
3602 rc = 0;
3603 }
3604 }
3605
3606 out:
3607 kfree(full_path);
3608 return rc;
3609 }
3610
3611 #ifdef CONFIG_CIFS_DFS_UPCALL
3612 int cifs_mount(struct cifs_sb_info *cifs_sb, struct smb3_fs_context *ctx)
3613 {
3614 struct cifs_mount_ctx mnt_ctx = { .cifs_sb = cifs_sb, .fs_ctx = ctx, };
3615 bool isdfs;
3616 int rc;
3617
3618 rc = dfs_mount_share(&mnt_ctx, &isdfs);
3619 if (rc)
3620 goto error;
3621 if (!isdfs)
3622 goto out;
3623
3624 /*
3625 * After reconnecting to a different server, unique ids won't match anymore, so we disable
3626 * serverino. This prevents dentry revalidation to think the dentry are stale (ESTALE).
3627 */
3628 cifs_autodisable_serverino(cifs_sb);
3629 /*
3630 * Force the use of prefix path to support failover on DFS paths that resolve to targets
3631 * that have different prefix paths.
3632 */
3633 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_USE_PREFIX_PATH;
3634 kfree(cifs_sb->prepath);
3635 cifs_sb->prepath = ctx->prepath;
3636 ctx->prepath = NULL;
3637
3638 out:
3639 cifs_try_adding_channels(mnt_ctx.ses);
3640 rc = mount_setup_tlink(cifs_sb, mnt_ctx.ses, mnt_ctx.tcon);
3641 if (rc)
3642 goto error;
3643
3644 free_xid(mnt_ctx.xid);
3645 return rc;
3646
3647 error:
3648 cifs_mount_put_conns(&mnt_ctx);
3649 return rc;
3650 }
3651 #else
3652 int cifs_mount(struct cifs_sb_info *cifs_sb, struct smb3_fs_context *ctx)
3653 {
3654 int rc = 0;
3655 struct cifs_mount_ctx mnt_ctx = { .cifs_sb = cifs_sb, .fs_ctx = ctx, };
3656
3657 rc = cifs_mount_get_session(&mnt_ctx);
3658 if (rc)
3659 goto error;
3660
3661 rc = cifs_mount_get_tcon(&mnt_ctx);
3662 if (!rc) {
3663 /*
3664 * Prevent superblock from being created with any missing
3665 * connections.
3666 */
3667 if (WARN_ON(!mnt_ctx.server))
3668 rc = -EHOSTDOWN;
3669 else if (WARN_ON(!mnt_ctx.ses))
3670 rc = -EACCES;
3671 else if (WARN_ON(!mnt_ctx.tcon))
3672 rc = -ENOENT;
3673 }
3674 if (rc)
3675 goto error;
3676
3677 rc = cifs_is_path_remote(&mnt_ctx);
3678 if (rc == -EREMOTE)
3679 rc = -EOPNOTSUPP;
3680 if (rc)
3681 goto error;
3682
3683 rc = mount_setup_tlink(cifs_sb, mnt_ctx.ses, mnt_ctx.tcon);
3684 if (rc)
3685 goto error;
3686
3687 free_xid(mnt_ctx.xid);
3688 return rc;
3689
3690 error:
3691 cifs_mount_put_conns(&mnt_ctx);
3692 return rc;
3693 }
3694 #endif
3695
3696 #ifdef CONFIG_CIFS_ALLOW_INSECURE_LEGACY
3697 /*
3698 * Issue a TREE_CONNECT request.
3699 */
3700 int
3701 CIFSTCon(const unsigned int xid, struct cifs_ses *ses,
3702 const char *tree, struct cifs_tcon *tcon,
3703 const struct nls_table *nls_codepage)
3704 {
3705 struct smb_hdr *smb_buffer;
3706 struct smb_hdr *smb_buffer_response;
3707 TCONX_REQ *pSMB;
3708 TCONX_RSP *pSMBr;
3709 unsigned char *bcc_ptr;
3710 int rc = 0;
3711 int length;
3712 __u16 bytes_left, count;
3713
3714 if (ses == NULL)
3715 return -EIO;
3716
3717 smb_buffer = cifs_buf_get();
3718 if (smb_buffer == NULL)
3719 return -ENOMEM;
3720
3721 smb_buffer_response = smb_buffer;
3722
3723 header_assemble(smb_buffer, SMB_COM_TREE_CONNECT_ANDX,
3724 NULL /*no tid */, 4 /*wct */);
3725
3726 smb_buffer->Mid = get_next_mid(ses->server);
3727 smb_buffer->Uid = ses->Suid;
3728 pSMB = (TCONX_REQ *) smb_buffer;
3729 pSMBr = (TCONX_RSP *) smb_buffer_response;
3730
3731 pSMB->AndXCommand = 0xFF;
3732 pSMB->Flags = cpu_to_le16(TCON_EXTENDED_SECINFO);
3733 bcc_ptr = &pSMB->Password[0];
3734
3735 pSMB->PasswordLength = cpu_to_le16(1); /* minimum */
3736 *bcc_ptr = 0; /* password is null byte */
3737 bcc_ptr++; /* skip password */
3738 /* already aligned so no need to do it below */
3739
3740 if (ses->server->sign)
3741 smb_buffer->Flags2 |= SMBFLG2_SECURITY_SIGNATURE;
3742
3743 if (ses->capabilities & CAP_STATUS32)
3744 smb_buffer->Flags2 |= SMBFLG2_ERR_STATUS;
3745
3746 if (ses->capabilities & CAP_DFS)
3747 smb_buffer->Flags2 |= SMBFLG2_DFS;
3748
3749 if (ses->capabilities & CAP_UNICODE) {
3750 smb_buffer->Flags2 |= SMBFLG2_UNICODE;
3751 length =
3752 cifs_strtoUTF16((__le16 *) bcc_ptr, tree,
3753 6 /* max utf8 char length in bytes */ *
3754 (/* server len*/ + 256 /* share len */), nls_codepage);
3755 bcc_ptr += 2 * length; /* convert num 16 bit words to bytes */
3756 bcc_ptr += 2; /* skip trailing null */
3757 } else { /* ASCII */
3758 strcpy(bcc_ptr, tree);
3759 bcc_ptr += strlen(tree) + 1;
3760 }
3761 strcpy(bcc_ptr, "?????");
3762 bcc_ptr += strlen("?????");
3763 bcc_ptr += 1;
3764 count = bcc_ptr - &pSMB->Password[0];
3765 be32_add_cpu(&pSMB->hdr.smb_buf_length, count);
3766 pSMB->ByteCount = cpu_to_le16(count);
3767
3768 rc = SendReceive(xid, ses, smb_buffer, smb_buffer_response, &length,
3769 0);
3770
3771 /* above now done in SendReceive */
3772 if (rc == 0) {
3773 bool is_unicode;
3774
3775 tcon->tid = smb_buffer_response->Tid;
3776 bcc_ptr = pByteArea(smb_buffer_response);
3777 bytes_left = get_bcc(smb_buffer_response);
3778 length = strnlen(bcc_ptr, bytes_left - 2);
3779 if (smb_buffer->Flags2 & SMBFLG2_UNICODE)
3780 is_unicode = true;
3781 else
3782 is_unicode = false;
3783
3784
3785 /* skip service field (NB: this field is always ASCII) */
3786 if (length == 3) {
3787 if ((bcc_ptr[0] == 'I') && (bcc_ptr[1] == 'P') &&
3788 (bcc_ptr[2] == 'C')) {
3789 cifs_dbg(FYI, "IPC connection\n");
3790 tcon->ipc = true;
3791 tcon->pipe = true;
3792 }
3793 } else if (length == 2) {
3794 if ((bcc_ptr[0] == 'A') && (bcc_ptr[1] == ':')) {
3795 /* the most common case */
3796 cifs_dbg(FYI, "disk share connection\n");
3797 }
3798 }
3799 bcc_ptr += length + 1;
3800 bytes_left -= (length + 1);
3801 strscpy(tcon->tree_name, tree, sizeof(tcon->tree_name));
3802
3803 /* mostly informational -- no need to fail on error here */
3804 kfree(tcon->nativeFileSystem);
3805 tcon->nativeFileSystem = cifs_strndup_from_utf16(bcc_ptr,
3806 bytes_left, is_unicode,
3807 nls_codepage);
3808
3809 cifs_dbg(FYI, "nativeFileSystem=%s\n", tcon->nativeFileSystem);
3810
3811 if ((smb_buffer_response->WordCount == 3) ||
3812 (smb_buffer_response->WordCount == 7))
3813 /* field is in same location */
3814 tcon->Flags = le16_to_cpu(pSMBr->OptionalSupport);
3815 else
3816 tcon->Flags = 0;
3817 cifs_dbg(FYI, "Tcon flags: 0x%x\n", tcon->Flags);
3818
3819 /*
3820 * reset_cifs_unix_caps calls QFSInfo which requires
3821 * need_reconnect to be false, but we would not need to call
3822 * reset_caps if this were not a reconnect case so must check
3823 * need_reconnect flag here. The caller will also clear
3824 * need_reconnect when tcon was successful but needed to be
3825 * cleared earlier in the case of unix extensions reconnect
3826 */
3827 if (tcon->need_reconnect && tcon->unix_ext) {
3828 cifs_dbg(FYI, "resetting caps for %s\n", tcon->tree_name);
3829 tcon->need_reconnect = false;
3830 reset_cifs_unix_caps(xid, tcon, NULL, NULL);
3831 }
3832 }
3833 cifs_buf_release(smb_buffer);
3834 return rc;
3835 }
3836 #endif /* CONFIG_CIFS_ALLOW_INSECURE_LEGACY */
3837
3838 static void delayed_free(struct rcu_head *p)
3839 {
3840 struct cifs_sb_info *cifs_sb = container_of(p, struct cifs_sb_info, rcu);
3841
3842 unload_nls(cifs_sb->local_nls);
3843 smb3_cleanup_fs_context(cifs_sb->ctx);
3844 kfree(cifs_sb);
3845 }
3846
3847 void
3848 cifs_umount(struct cifs_sb_info *cifs_sb)
3849 {
3850 struct rb_root *root = &cifs_sb->tlink_tree;
3851 struct rb_node *node;
3852 struct tcon_link *tlink;
3853
3854 cancel_delayed_work_sync(&cifs_sb->prune_tlinks);
3855
3856 spin_lock(&cifs_sb->tlink_tree_lock);
3857 while ((node = rb_first(root))) {
3858 tlink = rb_entry(node, struct tcon_link, tl_rbnode);
3859 cifs_get_tlink(tlink);
3860 clear_bit(TCON_LINK_IN_TREE, &tlink->tl_flags);
3861 rb_erase(node, root);
3862
3863 spin_unlock(&cifs_sb->tlink_tree_lock);
3864 cifs_put_tlink(tlink);
3865 spin_lock(&cifs_sb->tlink_tree_lock);
3866 }
3867 spin_unlock(&cifs_sb->tlink_tree_lock);
3868
3869 kfree(cifs_sb->prepath);
3870 call_rcu(&cifs_sb->rcu, delayed_free);
3871 }
3872
3873 int
3874 cifs_negotiate_protocol(const unsigned int xid, struct cifs_ses *ses,
3875 struct TCP_Server_Info *server)
3876 {
3877 int rc = 0;
3878
3879 if (!server->ops->need_neg || !server->ops->negotiate)
3880 return -ENOSYS;
3881
3882 /* only send once per connect */
3883 spin_lock(&server->srv_lock);
3884 if (server->tcpStatus != CifsGood &&
3885 server->tcpStatus != CifsNew &&
3886 server->tcpStatus != CifsNeedNegotiate) {
3887 spin_unlock(&server->srv_lock);
3888 return -EHOSTDOWN;
3889 }
3890
3891 if (!server->ops->need_neg(server) &&
3892 server->tcpStatus == CifsGood) {
3893 spin_unlock(&server->srv_lock);
3894 return 0;
3895 }
3896
3897 server->tcpStatus = CifsInNegotiate;
3898 spin_unlock(&server->srv_lock);
3899
3900 rc = server->ops->negotiate(xid, ses, server);
3901 if (rc == 0) {
3902 spin_lock(&server->srv_lock);
3903 if (server->tcpStatus == CifsInNegotiate)
3904 server->tcpStatus = CifsGood;
3905 else
3906 rc = -EHOSTDOWN;
3907 spin_unlock(&server->srv_lock);
3908 } else {
3909 spin_lock(&server->srv_lock);
3910 if (server->tcpStatus == CifsInNegotiate)
3911 server->tcpStatus = CifsNeedNegotiate;
3912 spin_unlock(&server->srv_lock);
3913 }
3914
3915 return rc;
3916 }
3917
3918 int
3919 cifs_setup_session(const unsigned int xid, struct cifs_ses *ses,
3920 struct TCP_Server_Info *server,
3921 struct nls_table *nls_info)
3922 {
3923 int rc = -ENOSYS;
3924 struct TCP_Server_Info *pserver = SERVER_IS_CHAN(server) ? server->primary_server : server;
3925 struct sockaddr_in6 *addr6 = (struct sockaddr_in6 *)&pserver->dstaddr;
3926 struct sockaddr_in *addr = (struct sockaddr_in *)&pserver->dstaddr;
3927 bool is_binding = false;
3928
3929 spin_lock(&ses->ses_lock);
3930 cifs_dbg(FYI, "%s: channel connect bitmap: 0x%lx\n",
3931 __func__, ses->chans_need_reconnect);
3932
3933 if (ses->ses_status != SES_GOOD &&
3934 ses->ses_status != SES_NEW &&
3935 ses->ses_status != SES_NEED_RECON) {
3936 spin_unlock(&ses->ses_lock);
3937 return -EHOSTDOWN;
3938 }
3939
3940 /* only send once per connect */
3941 spin_lock(&ses->chan_lock);
3942 if (CIFS_ALL_CHANS_GOOD(ses)) {
3943 if (ses->ses_status == SES_NEED_RECON)
3944 ses->ses_status = SES_GOOD;
3945 spin_unlock(&ses->chan_lock);
3946 spin_unlock(&ses->ses_lock);
3947 return 0;
3948 }
3949
3950 cifs_chan_set_in_reconnect(ses, server);
3951 is_binding = !CIFS_ALL_CHANS_NEED_RECONNECT(ses);
3952 spin_unlock(&ses->chan_lock);
3953
3954 if (!is_binding) {
3955 ses->ses_status = SES_IN_SETUP;
3956
3957 /* force iface_list refresh */
3958 ses->iface_last_update = 0;
3959 }
3960 spin_unlock(&ses->ses_lock);
3961
3962 /* update ses ip_addr only for primary chan */
3963 if (server == pserver) {
3964 if (server->dstaddr.ss_family == AF_INET6)
3965 scnprintf(ses->ip_addr, sizeof(ses->ip_addr), "%pI6", &addr6->sin6_addr);
3966 else
3967 scnprintf(ses->ip_addr, sizeof(ses->ip_addr), "%pI4", &addr->sin_addr);
3968 }
3969
3970 if (!is_binding) {
3971 ses->capabilities = server->capabilities;
3972 if (!linuxExtEnabled)
3973 ses->capabilities &= (~server->vals->cap_unix);
3974
3975 if (ses->auth_key.response) {
3976 cifs_dbg(FYI, "Free previous auth_key.response = %p\n",
3977 ses->auth_key.response);
3978 kfree_sensitive(ses->auth_key.response);
3979 ses->auth_key.response = NULL;
3980 ses->auth_key.len = 0;
3981 }
3982 }
3983
3984 cifs_dbg(FYI, "Security Mode: 0x%x Capabilities: 0x%x TimeAdjust: %d\n",
3985 server->sec_mode, server->capabilities, server->timeAdj);
3986
3987 if (server->ops->sess_setup)
3988 rc = server->ops->sess_setup(xid, ses, server, nls_info);
3989
3990 if (rc) {
3991 cifs_server_dbg(VFS, "Send error in SessSetup = %d\n", rc);
3992 spin_lock(&ses->ses_lock);
3993 if (ses->ses_status == SES_IN_SETUP)
3994 ses->ses_status = SES_NEED_RECON;
3995 spin_lock(&ses->chan_lock);
3996 cifs_chan_clear_in_reconnect(ses, server);
3997 spin_unlock(&ses->chan_lock);
3998 spin_unlock(&ses->ses_lock);
3999 } else {
4000 spin_lock(&ses->ses_lock);
4001 if (ses->ses_status == SES_IN_SETUP)
4002 ses->ses_status = SES_GOOD;
4003 spin_lock(&ses->chan_lock);
4004 cifs_chan_clear_in_reconnect(ses, server);
4005 cifs_chan_clear_need_reconnect(ses, server);
4006 spin_unlock(&ses->chan_lock);
4007 spin_unlock(&ses->ses_lock);
4008 }
4009
4010 return rc;
4011 }
4012
4013 static int
4014 cifs_set_vol_auth(struct smb3_fs_context *ctx, struct cifs_ses *ses)
4015 {
4016 ctx->sectype = ses->sectype;
4017
4018 /* krb5 is special, since we don't need username or pw */
4019 if (ctx->sectype == Kerberos)
4020 return 0;
4021
4022 return cifs_set_cifscreds(ctx, ses);
4023 }
4024
4025 static struct cifs_tcon *
4026 __cifs_construct_tcon(struct cifs_sb_info *cifs_sb, kuid_t fsuid)
4027 {
4028 int rc;
4029 struct cifs_tcon *master_tcon = cifs_sb_master_tcon(cifs_sb);
4030 struct cifs_ses *ses;
4031 struct cifs_tcon *tcon = NULL;
4032 struct smb3_fs_context *ctx;
4033 char *origin_fullpath = NULL;
4034
4035 ctx = kzalloc(sizeof(*ctx), GFP_KERNEL);
4036 if (ctx == NULL)
4037 return ERR_PTR(-ENOMEM);
4038
4039 ctx->local_nls = cifs_sb->local_nls;
4040 ctx->linux_uid = fsuid;
4041 ctx->cred_uid = fsuid;
4042 ctx->UNC = master_tcon->tree_name;
4043 ctx->retry = master_tcon->retry;
4044 ctx->nocase = master_tcon->nocase;
4045 ctx->nohandlecache = master_tcon->nohandlecache;
4046 ctx->local_lease = master_tcon->local_lease;
4047 ctx->no_lease = master_tcon->no_lease;
4048 ctx->resilient = master_tcon->use_resilient;
4049 ctx->persistent = master_tcon->use_persistent;
4050 ctx->handle_timeout = master_tcon->handle_timeout;
4051 ctx->no_linux_ext = !master_tcon->unix_ext;
4052 ctx->linux_ext = master_tcon->posix_extensions;
4053 ctx->sectype = master_tcon->ses->sectype;
4054 ctx->sign = master_tcon->ses->sign;
4055 ctx->seal = master_tcon->seal;
4056 ctx->witness = master_tcon->use_witness;
4057 ctx->dfs_root_ses = master_tcon->ses->dfs_root_ses;
4058
4059 rc = cifs_set_vol_auth(ctx, master_tcon->ses);
4060 if (rc) {
4061 tcon = ERR_PTR(rc);
4062 goto out;
4063 }
4064
4065 /* get a reference for the same TCP session */
4066 spin_lock(&cifs_tcp_ses_lock);
4067 ++master_tcon->ses->server->srv_count;
4068 spin_unlock(&cifs_tcp_ses_lock);
4069
4070 ses = cifs_get_smb_ses(master_tcon->ses->server, ctx);
4071 if (IS_ERR(ses)) {
4072 tcon = (struct cifs_tcon *)ses;
4073 cifs_put_tcp_session(master_tcon->ses->server, 0);
4074 goto out;
4075 }
4076
4077 #ifdef CONFIG_CIFS_DFS_UPCALL
4078 spin_lock(&master_tcon->tc_lock);
4079 if (master_tcon->origin_fullpath) {
4080 spin_unlock(&master_tcon->tc_lock);
4081 origin_fullpath = dfs_get_path(cifs_sb, cifs_sb->ctx->source);
4082 if (IS_ERR(origin_fullpath)) {
4083 tcon = ERR_CAST(origin_fullpath);
4084 origin_fullpath = NULL;
4085 cifs_put_smb_ses(ses);
4086 goto out;
4087 }
4088 } else {
4089 spin_unlock(&master_tcon->tc_lock);
4090 }
4091 #endif
4092
4093 tcon = cifs_get_tcon(ses, ctx);
4094 if (IS_ERR(tcon)) {
4095 cifs_put_smb_ses(ses);
4096 goto out;
4097 }
4098
4099 #ifdef CONFIG_CIFS_DFS_UPCALL
4100 if (origin_fullpath) {
4101 spin_lock(&tcon->tc_lock);
4102 tcon->origin_fullpath = origin_fullpath;
4103 spin_unlock(&tcon->tc_lock);
4104 origin_fullpath = NULL;
4105 queue_delayed_work(dfscache_wq, &tcon->dfs_cache_work,
4106 dfs_cache_get_ttl() * HZ);
4107 }
4108 #endif
4109
4110 #ifdef CONFIG_CIFS_ALLOW_INSECURE_LEGACY
4111 if (cap_unix(ses))
4112 reset_cifs_unix_caps(0, tcon, NULL, ctx);
4113 #endif /* CONFIG_CIFS_ALLOW_INSECURE_LEGACY */
4114
4115 out:
4116 kfree(ctx->username);
4117 kfree_sensitive(ctx->password);
4118 kfree(origin_fullpath);
4119 kfree(ctx);
4120
4121 return tcon;
4122 }
4123
4124 static struct cifs_tcon *
4125 cifs_construct_tcon(struct cifs_sb_info *cifs_sb, kuid_t fsuid)
4126 {
4127 struct cifs_tcon *ret;
4128
4129 cifs_mount_lock();
4130 ret = __cifs_construct_tcon(cifs_sb, fsuid);
4131 cifs_mount_unlock();
4132 return ret;
4133 }
4134
4135 struct cifs_tcon *
4136 cifs_sb_master_tcon(struct cifs_sb_info *cifs_sb)
4137 {
4138 return tlink_tcon(cifs_sb_master_tlink(cifs_sb));
4139 }
4140
4141 /* find and return a tlink with given uid */
4142 static struct tcon_link *
4143 tlink_rb_search(struct rb_root *root, kuid_t uid)
4144 {
4145 struct rb_node *node = root->rb_node;
4146 struct tcon_link *tlink;
4147
4148 while (node) {
4149 tlink = rb_entry(node, struct tcon_link, tl_rbnode);
4150
4151 if (uid_gt(tlink->tl_uid, uid))
4152 node = node->rb_left;
4153 else if (uid_lt(tlink->tl_uid, uid))
4154 node = node->rb_right;
4155 else
4156 return tlink;
4157 }
4158 return NULL;
4159 }
4160
4161 /* insert a tcon_link into the tree */
4162 static void
4163 tlink_rb_insert(struct rb_root *root, struct tcon_link *new_tlink)
4164 {
4165 struct rb_node **new = &(root->rb_node), *parent = NULL;
4166 struct tcon_link *tlink;
4167
4168 while (*new) {
4169 tlink = rb_entry(*new, struct tcon_link, tl_rbnode);
4170 parent = *new;
4171
4172 if (uid_gt(tlink->tl_uid, new_tlink->tl_uid))
4173 new = &((*new)->rb_left);
4174 else
4175 new = &((*new)->rb_right);
4176 }
4177
4178 rb_link_node(&new_tlink->tl_rbnode, parent, new);
4179 rb_insert_color(&new_tlink->tl_rbnode, root);
4180 }
4181
4182 /*
4183 * Find or construct an appropriate tcon given a cifs_sb and the fsuid of the
4184 * current task.
4185 *
4186 * If the superblock doesn't refer to a multiuser mount, then just return
4187 * the master tcon for the mount.
4188 *
4189 * First, search the rbtree for an existing tcon for this fsuid. If one
4190 * exists, then check to see if it's pending construction. If it is then wait
4191 * for construction to complete. Once it's no longer pending, check to see if
4192 * it failed and either return an error or retry construction, depending on
4193 * the timeout.
4194 *
4195 * If one doesn't exist then insert a new tcon_link struct into the tree and
4196 * try to construct a new one.
4197 */
4198 struct tcon_link *
4199 cifs_sb_tlink(struct cifs_sb_info *cifs_sb)
4200 {
4201 int ret;
4202 kuid_t fsuid = current_fsuid();
4203 struct tcon_link *tlink, *newtlink;
4204
4205 if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MULTIUSER))
4206 return cifs_get_tlink(cifs_sb_master_tlink(cifs_sb));
4207
4208 spin_lock(&cifs_sb->tlink_tree_lock);
4209 tlink = tlink_rb_search(&cifs_sb->tlink_tree, fsuid);
4210 if (tlink)
4211 cifs_get_tlink(tlink);
4212 spin_unlock(&cifs_sb->tlink_tree_lock);
4213
4214 if (tlink == NULL) {
4215 newtlink = kzalloc(sizeof(*tlink), GFP_KERNEL);
4216 if (newtlink == NULL)
4217 return ERR_PTR(-ENOMEM);
4218 newtlink->tl_uid = fsuid;
4219 newtlink->tl_tcon = ERR_PTR(-EACCES);
4220 set_bit(TCON_LINK_PENDING, &newtlink->tl_flags);
4221 set_bit(TCON_LINK_IN_TREE, &newtlink->tl_flags);
4222 cifs_get_tlink(newtlink);
4223
4224 spin_lock(&cifs_sb->tlink_tree_lock);
4225 /* was one inserted after previous search? */
4226 tlink = tlink_rb_search(&cifs_sb->tlink_tree, fsuid);
4227 if (tlink) {
4228 cifs_get_tlink(tlink);
4229 spin_unlock(&cifs_sb->tlink_tree_lock);
4230 kfree(newtlink);
4231 goto wait_for_construction;
4232 }
4233 tlink = newtlink;
4234 tlink_rb_insert(&cifs_sb->tlink_tree, tlink);
4235 spin_unlock(&cifs_sb->tlink_tree_lock);
4236 } else {
4237 wait_for_construction:
4238 ret = wait_on_bit(&tlink->tl_flags, TCON_LINK_PENDING,
4239 TASK_INTERRUPTIBLE);
4240 if (ret) {
4241 cifs_put_tlink(tlink);
4242 return ERR_PTR(-ERESTARTSYS);
4243 }
4244
4245 /* if it's good, return it */
4246 if (!IS_ERR(tlink->tl_tcon))
4247 return tlink;
4248
4249 /* return error if we tried this already recently */
4250 if (time_before(jiffies, tlink->tl_time + TLINK_ERROR_EXPIRE)) {
4251 cifs_put_tlink(tlink);
4252 return ERR_PTR(-EACCES);
4253 }
4254
4255 if (test_and_set_bit(TCON_LINK_PENDING, &tlink->tl_flags))
4256 goto wait_for_construction;
4257 }
4258
4259 tlink->tl_tcon = cifs_construct_tcon(cifs_sb, fsuid);
4260 clear_bit(TCON_LINK_PENDING, &tlink->tl_flags);
4261 wake_up_bit(&tlink->tl_flags, TCON_LINK_PENDING);
4262
4263 if (IS_ERR(tlink->tl_tcon)) {
4264 cifs_put_tlink(tlink);
4265 return ERR_PTR(-EACCES);
4266 }
4267
4268 return tlink;
4269 }
4270
4271 /*
4272 * periodic workqueue job that scans tcon_tree for a superblock and closes
4273 * out tcons.
4274 */
4275 static void
4276 cifs_prune_tlinks(struct work_struct *work)
4277 {
4278 struct cifs_sb_info *cifs_sb = container_of(work, struct cifs_sb_info,
4279 prune_tlinks.work);
4280 struct rb_root *root = &cifs_sb->tlink_tree;
4281 struct rb_node *node;
4282 struct rb_node *tmp;
4283 struct tcon_link *tlink;
4284
4285 /*
4286 * Because we drop the spinlock in the loop in order to put the tlink
4287 * it's not guarded against removal of links from the tree. The only
4288 * places that remove entries from the tree are this function and
4289 * umounts. Because this function is non-reentrant and is canceled
4290 * before umount can proceed, this is safe.
4291 */
4292 spin_lock(&cifs_sb->tlink_tree_lock);
4293 node = rb_first(root);
4294 while (node != NULL) {
4295 tmp = node;
4296 node = rb_next(tmp);
4297 tlink = rb_entry(tmp, struct tcon_link, tl_rbnode);
4298
4299 if (test_bit(TCON_LINK_MASTER, &tlink->tl_flags) ||
4300 atomic_read(&tlink->tl_count) != 0 ||
4301 time_after(tlink->tl_time + TLINK_IDLE_EXPIRE, jiffies))
4302 continue;
4303
4304 cifs_get_tlink(tlink);
4305 clear_bit(TCON_LINK_IN_TREE, &tlink->tl_flags);
4306 rb_erase(tmp, root);
4307
4308 spin_unlock(&cifs_sb->tlink_tree_lock);
4309 cifs_put_tlink(tlink);
4310 spin_lock(&cifs_sb->tlink_tree_lock);
4311 }
4312 spin_unlock(&cifs_sb->tlink_tree_lock);
4313
4314 queue_delayed_work(cifsiod_wq, &cifs_sb->prune_tlinks,
4315 TLINK_IDLE_EXPIRE);
4316 }
4317
4318 #ifndef CONFIG_CIFS_DFS_UPCALL
4319 int cifs_tree_connect(const unsigned int xid, struct cifs_tcon *tcon, const struct nls_table *nlsc)
4320 {
4321 int rc;
4322 const struct smb_version_operations *ops = tcon->ses->server->ops;
4323
4324 /* only send once per connect */
4325 spin_lock(&tcon->tc_lock);
4326
4327 /* if tcon is marked for needing reconnect, update state */
4328 if (tcon->need_reconnect)
4329 tcon->status = TID_NEED_TCON;
4330
4331 if (tcon->status == TID_GOOD) {
4332 spin_unlock(&tcon->tc_lock);
4333 return 0;
4334 }
4335
4336 if (tcon->status != TID_NEW &&
4337 tcon->status != TID_NEED_TCON) {
4338 spin_unlock(&tcon->tc_lock);
4339 return -EHOSTDOWN;
4340 }
4341
4342 tcon->status = TID_IN_TCON;
4343 spin_unlock(&tcon->tc_lock);
4344
4345 rc = ops->tree_connect(xid, tcon->ses, tcon->tree_name, tcon, nlsc);
4346 if (rc) {
4347 spin_lock(&tcon->tc_lock);
4348 if (tcon->status == TID_IN_TCON)
4349 tcon->status = TID_NEED_TCON;
4350 spin_unlock(&tcon->tc_lock);
4351 } else {
4352 spin_lock(&tcon->tc_lock);
4353 if (tcon->status == TID_IN_TCON)
4354 tcon->status = TID_GOOD;
4355 tcon->need_reconnect = false;
4356 spin_unlock(&tcon->tc_lock);
4357 }
4358
4359 return rc;
4360 }
4361 #endif
4362
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