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[thirdparty/kernel/stable.git] / fs / smb / client / connect.c
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 extern mempool_t *cifs_req_poolp;
56 extern bool disable_legacy_dialects;
57
58 /* FIXME: should these be tunable? */
59 #define TLINK_ERROR_EXPIRE (1 * HZ)
60 #define TLINK_IDLE_EXPIRE (600 * HZ)
61
62 /* Drop the connection to not overload the server */
63 #define MAX_STATUS_IO_TIMEOUT 5
64
65 static int ip_connect(struct TCP_Server_Info *server);
66 static int generic_ip_connect(struct TCP_Server_Info *server);
67 static void tlink_rb_insert(struct rb_root *root, struct tcon_link *new_tlink);
68 static void cifs_prune_tlinks(struct work_struct *work);
69
70 /*
71 * Resolve hostname and set ip addr in tcp ses. Useful for hostnames that may
72 * get their ip addresses changed at some point.
73 *
74 * This should be called with server->srv_mutex held.
75 */
76 static int reconn_set_ipaddr_from_hostname(struct TCP_Server_Info *server)
77 {
78 int rc;
79 int len;
80 char *unc;
81 struct sockaddr_storage ss;
82
83 if (!server->hostname)
84 return -EINVAL;
85
86 /* if server hostname isn't populated, there's nothing to do here */
87 if (server->hostname[0] == '\0')
88 return 0;
89
90 len = strlen(server->hostname) + 3;
91
92 unc = kmalloc(len, GFP_KERNEL);
93 if (!unc) {
94 cifs_dbg(FYI, "%s: failed to create UNC path\n", __func__);
95 return -ENOMEM;
96 }
97 scnprintf(unc, len, "\\\\%s", server->hostname);
98
99 spin_lock(&server->srv_lock);
100 ss = server->dstaddr;
101 spin_unlock(&server->srv_lock);
102
103 rc = dns_resolve_server_name_to_ip(unc, (struct sockaddr *)&ss, NULL);
104 kfree(unc);
105
106 if (rc < 0) {
107 cifs_dbg(FYI, "%s: failed to resolve server part of %s to IP: %d\n",
108 __func__, server->hostname, rc);
109 } else {
110 spin_lock(&server->srv_lock);
111 memcpy(&server->dstaddr, &ss, sizeof(server->dstaddr));
112 spin_unlock(&server->srv_lock);
113 rc = 0;
114 }
115
116 return rc;
117 }
118
119 static void smb2_query_server_interfaces(struct work_struct *work)
120 {
121 int rc;
122 struct cifs_tcon *tcon = container_of(work,
123 struct cifs_tcon,
124 query_interfaces.work);
125
126 /*
127 * query server network interfaces, in case they change
128 */
129 rc = SMB3_request_interfaces(0, tcon, false);
130 if (rc) {
131 cifs_dbg(FYI, "%s: failed to query server interfaces: %d\n",
132 __func__, rc);
133 }
134
135 queue_delayed_work(cifsiod_wq, &tcon->query_interfaces,
136 (SMB_INTERFACE_POLL_INTERVAL * HZ));
137 }
138
139 /*
140 * Update the tcpStatus for the server.
141 * This is used to signal the cifsd thread to call cifs_reconnect
142 * ONLY cifsd thread should call cifs_reconnect. For any other
143 * thread, use this function
144 *
145 * @server: the tcp ses for which reconnect is needed
146 * @all_channels: if this needs to be done for all channels
147 */
148 void
149 cifs_signal_cifsd_for_reconnect(struct TCP_Server_Info *server,
150 bool all_channels)
151 {
152 struct TCP_Server_Info *pserver;
153 struct cifs_ses *ses;
154 int i;
155
156 /* If server is a channel, select the primary channel */
157 pserver = SERVER_IS_CHAN(server) ? server->primary_server : server;
158
159 spin_lock(&pserver->srv_lock);
160 if (!all_channels) {
161 pserver->tcpStatus = CifsNeedReconnect;
162 spin_unlock(&pserver->srv_lock);
163 return;
164 }
165 spin_unlock(&pserver->srv_lock);
166
167 spin_lock(&cifs_tcp_ses_lock);
168 list_for_each_entry(ses, &pserver->smb_ses_list, smb_ses_list) {
169 spin_lock(&ses->chan_lock);
170 for (i = 0; i < ses->chan_count; i++) {
171 spin_lock(&ses->chans[i].server->srv_lock);
172 ses->chans[i].server->tcpStatus = CifsNeedReconnect;
173 spin_unlock(&ses->chans[i].server->srv_lock);
174 }
175 spin_unlock(&ses->chan_lock);
176 }
177 spin_unlock(&cifs_tcp_ses_lock);
178 }
179
180 /*
181 * Mark all sessions and tcons for reconnect.
182 * IMPORTANT: make sure that this gets called only from
183 * cifsd thread. For any other thread, use
184 * cifs_signal_cifsd_for_reconnect
185 *
186 * @server: the tcp ses for which reconnect is needed
187 * @server needs to be previously set to CifsNeedReconnect.
188 * @mark_smb_session: whether even sessions need to be marked
189 */
190 void
191 cifs_mark_tcp_ses_conns_for_reconnect(struct TCP_Server_Info *server,
192 bool mark_smb_session)
193 {
194 struct TCP_Server_Info *pserver;
195 struct cifs_ses *ses, *nses;
196 struct cifs_tcon *tcon;
197
198 /*
199 * before reconnecting the tcp session, mark the smb session (uid) and the tid bad so they
200 * are not used until reconnected.
201 */
202 cifs_dbg(FYI, "%s: marking necessary sessions and tcons for reconnect\n", __func__);
203
204 /* If server is a channel, select the primary channel */
205 pserver = SERVER_IS_CHAN(server) ? server->primary_server : server;
206
207
208 spin_lock(&cifs_tcp_ses_lock);
209 list_for_each_entry_safe(ses, nses, &pserver->smb_ses_list, smb_ses_list) {
210 /* check if iface is still active */
211 if (!cifs_chan_is_iface_active(ses, server))
212 cifs_chan_update_iface(ses, server);
213
214 spin_lock(&ses->chan_lock);
215 if (!mark_smb_session && cifs_chan_needs_reconnect(ses, server)) {
216 spin_unlock(&ses->chan_lock);
217 continue;
218 }
219
220 if (mark_smb_session)
221 CIFS_SET_ALL_CHANS_NEED_RECONNECT(ses);
222 else
223 cifs_chan_set_need_reconnect(ses, server);
224
225 cifs_dbg(FYI, "%s: channel connect bitmap: 0x%lx\n",
226 __func__, ses->chans_need_reconnect);
227
228 /* If all channels need reconnect, then tcon needs reconnect */
229 if (!mark_smb_session && !CIFS_ALL_CHANS_NEED_RECONNECT(ses)) {
230 spin_unlock(&ses->chan_lock);
231 continue;
232 }
233 spin_unlock(&ses->chan_lock);
234
235 spin_lock(&ses->ses_lock);
236 ses->ses_status = SES_NEED_RECON;
237 spin_unlock(&ses->ses_lock);
238
239 list_for_each_entry(tcon, &ses->tcon_list, tcon_list) {
240 tcon->need_reconnect = true;
241 spin_lock(&tcon->tc_lock);
242 tcon->status = TID_NEED_RECON;
243 spin_unlock(&tcon->tc_lock);
244 }
245 if (ses->tcon_ipc) {
246 ses->tcon_ipc->need_reconnect = true;
247 spin_lock(&ses->tcon_ipc->tc_lock);
248 ses->tcon_ipc->status = TID_NEED_RECON;
249 spin_unlock(&ses->tcon_ipc->tc_lock);
250 }
251 }
252 spin_unlock(&cifs_tcp_ses_lock);
253 }
254
255 static void
256 cifs_abort_connection(struct TCP_Server_Info *server)
257 {
258 struct mid_q_entry *mid, *nmid;
259 struct list_head retry_list;
260
261 server->maxBuf = 0;
262 server->max_read = 0;
263
264 /* do not want to be sending data on a socket we are freeing */
265 cifs_dbg(FYI, "%s: tearing down socket\n", __func__);
266 cifs_server_lock(server);
267 if (server->ssocket) {
268 cifs_dbg(FYI, "State: 0x%x Flags: 0x%lx\n", server->ssocket->state,
269 server->ssocket->flags);
270 kernel_sock_shutdown(server->ssocket, SHUT_WR);
271 cifs_dbg(FYI, "Post shutdown state: 0x%x Flags: 0x%lx\n", server->ssocket->state,
272 server->ssocket->flags);
273 sock_release(server->ssocket);
274 server->ssocket = NULL;
275 }
276 server->sequence_number = 0;
277 server->session_estab = false;
278 kfree_sensitive(server->session_key.response);
279 server->session_key.response = NULL;
280 server->session_key.len = 0;
281 server->lstrp = jiffies;
282
283 /* mark submitted MIDs for retry and issue callback */
284 INIT_LIST_HEAD(&retry_list);
285 cifs_dbg(FYI, "%s: moving mids to private list\n", __func__);
286 spin_lock(&server->mid_lock);
287 list_for_each_entry_safe(mid, nmid, &server->pending_mid_q, qhead) {
288 kref_get(&mid->refcount);
289 if (mid->mid_state == MID_REQUEST_SUBMITTED)
290 mid->mid_state = MID_RETRY_NEEDED;
291 list_move(&mid->qhead, &retry_list);
292 mid->mid_flags |= MID_DELETED;
293 }
294 spin_unlock(&server->mid_lock);
295 cifs_server_unlock(server);
296
297 cifs_dbg(FYI, "%s: issuing mid callbacks\n", __func__);
298 list_for_each_entry_safe(mid, nmid, &retry_list, qhead) {
299 list_del_init(&mid->qhead);
300 mid->callback(mid);
301 release_mid(mid);
302 }
303
304 if (cifs_rdma_enabled(server)) {
305 cifs_server_lock(server);
306 smbd_destroy(server);
307 cifs_server_unlock(server);
308 }
309 }
310
311 static bool cifs_tcp_ses_needs_reconnect(struct TCP_Server_Info *server, int num_targets)
312 {
313 spin_lock(&server->srv_lock);
314 server->nr_targets = num_targets;
315 if (server->tcpStatus == CifsExiting) {
316 /* the demux thread will exit normally next time through the loop */
317 spin_unlock(&server->srv_lock);
318 wake_up(&server->response_q);
319 return false;
320 }
321
322 cifs_dbg(FYI, "Mark tcp session as need reconnect\n");
323 trace_smb3_reconnect(server->CurrentMid, server->conn_id,
324 server->hostname);
325 server->tcpStatus = CifsNeedReconnect;
326
327 spin_unlock(&server->srv_lock);
328 return true;
329 }
330
331 /*
332 * cifs tcp session reconnection
333 *
334 * mark tcp session as reconnecting so temporarily locked
335 * mark all smb sessions as reconnecting for tcp session
336 * reconnect tcp session
337 * wake up waiters on reconnection? - (not needed currently)
338 *
339 * if mark_smb_session is passed as true, unconditionally mark
340 * the smb session (and tcon) for reconnect as well. This value
341 * doesn't really matter for non-multichannel scenario.
342 *
343 */
344 static int __cifs_reconnect(struct TCP_Server_Info *server,
345 bool mark_smb_session)
346 {
347 int rc = 0;
348
349 if (!cifs_tcp_ses_needs_reconnect(server, 1))
350 return 0;
351
352 cifs_mark_tcp_ses_conns_for_reconnect(server, mark_smb_session);
353
354 cifs_abort_connection(server);
355
356 do {
357 try_to_freeze();
358 cifs_server_lock(server);
359
360 if (!cifs_swn_set_server_dstaddr(server)) {
361 /* resolve the hostname again to make sure that IP address is up-to-date */
362 rc = reconn_set_ipaddr_from_hostname(server);
363 cifs_dbg(FYI, "%s: reconn_set_ipaddr_from_hostname: rc=%d\n", __func__, rc);
364 }
365
366 if (cifs_rdma_enabled(server))
367 rc = smbd_reconnect(server);
368 else
369 rc = generic_ip_connect(server);
370 if (rc) {
371 cifs_server_unlock(server);
372 cifs_dbg(FYI, "%s: reconnect error %d\n", __func__, rc);
373 msleep(3000);
374 } else {
375 atomic_inc(&tcpSesReconnectCount);
376 set_credits(server, 1);
377 spin_lock(&server->srv_lock);
378 if (server->tcpStatus != CifsExiting)
379 server->tcpStatus = CifsNeedNegotiate;
380 spin_unlock(&server->srv_lock);
381 cifs_swn_reset_server_dstaddr(server);
382 cifs_server_unlock(server);
383 mod_delayed_work(cifsiod_wq, &server->reconnect, 0);
384 }
385 } while (server->tcpStatus == CifsNeedReconnect);
386
387 spin_lock(&server->srv_lock);
388 if (server->tcpStatus == CifsNeedNegotiate)
389 mod_delayed_work(cifsiod_wq, &server->echo, 0);
390 spin_unlock(&server->srv_lock);
391
392 wake_up(&server->response_q);
393 return rc;
394 }
395
396 #ifdef CONFIG_CIFS_DFS_UPCALL
397 static int __reconnect_target_unlocked(struct TCP_Server_Info *server, const char *target)
398 {
399 int rc;
400 char *hostname;
401
402 if (!cifs_swn_set_server_dstaddr(server)) {
403 if (server->hostname != target) {
404 hostname = extract_hostname(target);
405 if (!IS_ERR(hostname)) {
406 spin_lock(&server->srv_lock);
407 kfree(server->hostname);
408 server->hostname = hostname;
409 spin_unlock(&server->srv_lock);
410 } else {
411 cifs_dbg(FYI, "%s: couldn't extract hostname or address from dfs target: %ld\n",
412 __func__, PTR_ERR(hostname));
413 cifs_dbg(FYI, "%s: default to last target server: %s\n", __func__,
414 server->hostname);
415 }
416 }
417 /* resolve the hostname again to make sure that IP address is up-to-date. */
418 rc = reconn_set_ipaddr_from_hostname(server);
419 cifs_dbg(FYI, "%s: reconn_set_ipaddr_from_hostname: rc=%d\n", __func__, rc);
420 }
421 /* Reconnect the socket */
422 if (cifs_rdma_enabled(server))
423 rc = smbd_reconnect(server);
424 else
425 rc = generic_ip_connect(server);
426
427 return rc;
428 }
429
430 static int reconnect_target_unlocked(struct TCP_Server_Info *server, struct dfs_cache_tgt_list *tl,
431 struct dfs_cache_tgt_iterator **target_hint)
432 {
433 int rc;
434 struct dfs_cache_tgt_iterator *tit;
435
436 *target_hint = NULL;
437
438 /* If dfs target list is empty, then reconnect to last server */
439 tit = dfs_cache_get_tgt_iterator(tl);
440 if (!tit)
441 return __reconnect_target_unlocked(server, server->hostname);
442
443 /* Otherwise, try every dfs target in @tl */
444 for (; tit; tit = dfs_cache_get_next_tgt(tl, tit)) {
445 rc = __reconnect_target_unlocked(server, dfs_cache_get_tgt_name(tit));
446 if (!rc) {
447 *target_hint = tit;
448 break;
449 }
450 }
451 return rc;
452 }
453
454 static int reconnect_dfs_server(struct TCP_Server_Info *server)
455 {
456 struct dfs_cache_tgt_iterator *target_hint = NULL;
457 DFS_CACHE_TGT_LIST(tl);
458 int num_targets = 0;
459 int rc = 0;
460
461 /*
462 * Determine the number of dfs targets the referral path in @cifs_sb resolves to.
463 *
464 * smb2_reconnect() needs to know how long it should wait based upon the number of dfs
465 * targets (server->nr_targets). It's also possible that the cached referral was cleared
466 * through /proc/fs/cifs/dfscache or the target list is empty due to server settings after
467 * refreshing the referral, so, in this case, default it to 1.
468 */
469 mutex_lock(&server->refpath_lock);
470 if (!dfs_cache_noreq_find(server->leaf_fullpath + 1, NULL, &tl))
471 num_targets = dfs_cache_get_nr_tgts(&tl);
472 mutex_unlock(&server->refpath_lock);
473 if (!num_targets)
474 num_targets = 1;
475
476 if (!cifs_tcp_ses_needs_reconnect(server, num_targets))
477 return 0;
478
479 /*
480 * Unconditionally mark all sessions & tcons for reconnect as we might be connecting to a
481 * different server or share during failover. It could be improved by adding some logic to
482 * only do that in case it connects to a different server or share, though.
483 */
484 cifs_mark_tcp_ses_conns_for_reconnect(server, true);
485
486 cifs_abort_connection(server);
487
488 do {
489 try_to_freeze();
490 cifs_server_lock(server);
491
492 rc = reconnect_target_unlocked(server, &tl, &target_hint);
493 if (rc) {
494 /* Failed to reconnect socket */
495 cifs_server_unlock(server);
496 cifs_dbg(FYI, "%s: reconnect error %d\n", __func__, rc);
497 msleep(3000);
498 continue;
499 }
500 /*
501 * Socket was created. Update tcp session status to CifsNeedNegotiate so that a
502 * process waiting for reconnect will know it needs to re-establish session and tcon
503 * through the reconnected target server.
504 */
505 atomic_inc(&tcpSesReconnectCount);
506 set_credits(server, 1);
507 spin_lock(&server->srv_lock);
508 if (server->tcpStatus != CifsExiting)
509 server->tcpStatus = CifsNeedNegotiate;
510 spin_unlock(&server->srv_lock);
511 cifs_swn_reset_server_dstaddr(server);
512 cifs_server_unlock(server);
513 mod_delayed_work(cifsiod_wq, &server->reconnect, 0);
514 } while (server->tcpStatus == CifsNeedReconnect);
515
516 mutex_lock(&server->refpath_lock);
517 dfs_cache_noreq_update_tgthint(server->leaf_fullpath + 1, target_hint);
518 mutex_unlock(&server->refpath_lock);
519 dfs_cache_free_tgts(&tl);
520
521 /* Need to set up echo worker again once connection has been established */
522 spin_lock(&server->srv_lock);
523 if (server->tcpStatus == CifsNeedNegotiate)
524 mod_delayed_work(cifsiod_wq, &server->echo, 0);
525 spin_unlock(&server->srv_lock);
526
527 wake_up(&server->response_q);
528 return rc;
529 }
530
531 int cifs_reconnect(struct TCP_Server_Info *server, bool mark_smb_session)
532 {
533 mutex_lock(&server->refpath_lock);
534 if (!server->leaf_fullpath) {
535 mutex_unlock(&server->refpath_lock);
536 return __cifs_reconnect(server, mark_smb_session);
537 }
538 mutex_unlock(&server->refpath_lock);
539
540 return reconnect_dfs_server(server);
541 }
542 #else
543 int cifs_reconnect(struct TCP_Server_Info *server, bool mark_smb_session)
544 {
545 return __cifs_reconnect(server, mark_smb_session);
546 }
547 #endif
548
549 static void
550 cifs_echo_request(struct work_struct *work)
551 {
552 int rc;
553 struct TCP_Server_Info *server = container_of(work,
554 struct TCP_Server_Info, echo.work);
555
556 /*
557 * We cannot send an echo if it is disabled.
558 * Also, no need to ping if we got a response recently.
559 */
560
561 if (server->tcpStatus == CifsNeedReconnect ||
562 server->tcpStatus == CifsExiting ||
563 server->tcpStatus == CifsNew ||
564 (server->ops->can_echo && !server->ops->can_echo(server)) ||
565 time_before(jiffies, server->lstrp + server->echo_interval - HZ))
566 goto requeue_echo;
567
568 rc = server->ops->echo ? server->ops->echo(server) : -ENOSYS;
569 cifs_server_dbg(FYI, "send echo request: rc = %d\n", rc);
570
571 /* Check witness registrations */
572 cifs_swn_check();
573
574 requeue_echo:
575 queue_delayed_work(cifsiod_wq, &server->echo, server->echo_interval);
576 }
577
578 static bool
579 allocate_buffers(struct TCP_Server_Info *server)
580 {
581 if (!server->bigbuf) {
582 server->bigbuf = (char *)cifs_buf_get();
583 if (!server->bigbuf) {
584 cifs_server_dbg(VFS, "No memory for large SMB response\n");
585 msleep(3000);
586 /* retry will check if exiting */
587 return false;
588 }
589 } else if (server->large_buf) {
590 /* we are reusing a dirty large buf, clear its start */
591 memset(server->bigbuf, 0, HEADER_SIZE(server));
592 }
593
594 if (!server->smallbuf) {
595 server->smallbuf = (char *)cifs_small_buf_get();
596 if (!server->smallbuf) {
597 cifs_server_dbg(VFS, "No memory for SMB response\n");
598 msleep(1000);
599 /* retry will check if exiting */
600 return false;
601 }
602 /* beginning of smb buffer is cleared in our buf_get */
603 } else {
604 /* if existing small buf clear beginning */
605 memset(server->smallbuf, 0, HEADER_SIZE(server));
606 }
607
608 return true;
609 }
610
611 static bool
612 server_unresponsive(struct TCP_Server_Info *server)
613 {
614 /*
615 * We need to wait 3 echo intervals to make sure we handle such
616 * situations right:
617 * 1s client sends a normal SMB request
618 * 2s client gets a response
619 * 30s echo workqueue job pops, and decides we got a response recently
620 * and don't need to send another
621 * ...
622 * 65s kernel_recvmsg times out, and we see that we haven't gotten
623 * a response in >60s.
624 */
625 spin_lock(&server->srv_lock);
626 if ((server->tcpStatus == CifsGood ||
627 server->tcpStatus == CifsNeedNegotiate) &&
628 (!server->ops->can_echo || server->ops->can_echo(server)) &&
629 time_after(jiffies, server->lstrp + 3 * server->echo_interval)) {
630 spin_unlock(&server->srv_lock);
631 cifs_server_dbg(VFS, "has not responded in %lu seconds. Reconnecting...\n",
632 (3 * server->echo_interval) / HZ);
633 cifs_reconnect(server, false);
634 return true;
635 }
636 spin_unlock(&server->srv_lock);
637
638 return false;
639 }
640
641 static inline bool
642 zero_credits(struct TCP_Server_Info *server)
643 {
644 int val;
645
646 spin_lock(&server->req_lock);
647 val = server->credits + server->echo_credits + server->oplock_credits;
648 if (server->in_flight == 0 && val == 0) {
649 spin_unlock(&server->req_lock);
650 return true;
651 }
652 spin_unlock(&server->req_lock);
653 return false;
654 }
655
656 static int
657 cifs_readv_from_socket(struct TCP_Server_Info *server, struct msghdr *smb_msg)
658 {
659 int length = 0;
660 int total_read;
661
662 for (total_read = 0; msg_data_left(smb_msg); total_read += length) {
663 try_to_freeze();
664
665 /* reconnect if no credits and no requests in flight */
666 if (zero_credits(server)) {
667 cifs_reconnect(server, false);
668 return -ECONNABORTED;
669 }
670
671 if (server_unresponsive(server))
672 return -ECONNABORTED;
673 if (cifs_rdma_enabled(server) && server->smbd_conn)
674 length = smbd_recv(server->smbd_conn, smb_msg);
675 else
676 length = sock_recvmsg(server->ssocket, smb_msg, 0);
677
678 spin_lock(&server->srv_lock);
679 if (server->tcpStatus == CifsExiting) {
680 spin_unlock(&server->srv_lock);
681 return -ESHUTDOWN;
682 }
683
684 if (server->tcpStatus == CifsNeedReconnect) {
685 spin_unlock(&server->srv_lock);
686 cifs_reconnect(server, false);
687 return -ECONNABORTED;
688 }
689 spin_unlock(&server->srv_lock);
690
691 if (length == -ERESTARTSYS ||
692 length == -EAGAIN ||
693 length == -EINTR) {
694 /*
695 * Minimum sleep to prevent looping, allowing socket
696 * to clear and app threads to set tcpStatus
697 * CifsNeedReconnect if server hung.
698 */
699 usleep_range(1000, 2000);
700 length = 0;
701 continue;
702 }
703
704 if (length <= 0) {
705 cifs_dbg(FYI, "Received no data or error: %d\n", length);
706 cifs_reconnect(server, false);
707 return -ECONNABORTED;
708 }
709 }
710 return total_read;
711 }
712
713 int
714 cifs_read_from_socket(struct TCP_Server_Info *server, char *buf,
715 unsigned int to_read)
716 {
717 struct msghdr smb_msg = {};
718 struct kvec iov = {.iov_base = buf, .iov_len = to_read};
719 iov_iter_kvec(&smb_msg.msg_iter, ITER_DEST, &iov, 1, to_read);
720
721 return cifs_readv_from_socket(server, &smb_msg);
722 }
723
724 ssize_t
725 cifs_discard_from_socket(struct TCP_Server_Info *server, size_t to_read)
726 {
727 struct msghdr smb_msg = {};
728
729 /*
730 * iov_iter_discard already sets smb_msg.type and count and iov_offset
731 * and cifs_readv_from_socket sets msg_control and msg_controllen
732 * so little to initialize in struct msghdr
733 */
734 iov_iter_discard(&smb_msg.msg_iter, ITER_DEST, to_read);
735
736 return cifs_readv_from_socket(server, &smb_msg);
737 }
738
739 int
740 cifs_read_page_from_socket(struct TCP_Server_Info *server, struct page *page,
741 unsigned int page_offset, unsigned int to_read)
742 {
743 struct msghdr smb_msg = {};
744 struct bio_vec bv;
745
746 bvec_set_page(&bv, page, to_read, page_offset);
747 iov_iter_bvec(&smb_msg.msg_iter, ITER_DEST, &bv, 1, to_read);
748 return cifs_readv_from_socket(server, &smb_msg);
749 }
750
751 int
752 cifs_read_iter_from_socket(struct TCP_Server_Info *server, struct iov_iter *iter,
753 unsigned int to_read)
754 {
755 struct msghdr smb_msg = { .msg_iter = *iter };
756 int ret;
757
758 iov_iter_truncate(&smb_msg.msg_iter, to_read);
759 ret = cifs_readv_from_socket(server, &smb_msg);
760 if (ret > 0)
761 iov_iter_advance(iter, ret);
762 return ret;
763 }
764
765 static bool
766 is_smb_response(struct TCP_Server_Info *server, unsigned char type)
767 {
768 /*
769 * The first byte big endian of the length field,
770 * is actually not part of the length but the type
771 * with the most common, zero, as regular data.
772 */
773 switch (type) {
774 case RFC1002_SESSION_MESSAGE:
775 /* Regular SMB response */
776 return true;
777 case RFC1002_SESSION_KEEP_ALIVE:
778 cifs_dbg(FYI, "RFC 1002 session keep alive\n");
779 break;
780 case RFC1002_POSITIVE_SESSION_RESPONSE:
781 cifs_dbg(FYI, "RFC 1002 positive session response\n");
782 break;
783 case RFC1002_NEGATIVE_SESSION_RESPONSE:
784 /*
785 * We get this from Windows 98 instead of an error on
786 * SMB negprot response.
787 */
788 cifs_dbg(FYI, "RFC 1002 negative session response\n");
789 /* give server a second to clean up */
790 msleep(1000);
791 /*
792 * Always try 445 first on reconnect since we get NACK
793 * on some if we ever connected to port 139 (the NACK
794 * is since we do not begin with RFC1001 session
795 * initialize frame).
796 */
797 cifs_set_port((struct sockaddr *)&server->dstaddr, CIFS_PORT);
798 cifs_reconnect(server, true);
799 break;
800 default:
801 cifs_server_dbg(VFS, "RFC 1002 unknown response type 0x%x\n", type);
802 cifs_reconnect(server, true);
803 }
804
805 return false;
806 }
807
808 void
809 dequeue_mid(struct mid_q_entry *mid, bool malformed)
810 {
811 #ifdef CONFIG_CIFS_STATS2
812 mid->when_received = jiffies;
813 #endif
814 spin_lock(&mid->server->mid_lock);
815 if (!malformed)
816 mid->mid_state = MID_RESPONSE_RECEIVED;
817 else
818 mid->mid_state = MID_RESPONSE_MALFORMED;
819 /*
820 * Trying to handle/dequeue a mid after the send_recv()
821 * function has finished processing it is a bug.
822 */
823 if (mid->mid_flags & MID_DELETED) {
824 spin_unlock(&mid->server->mid_lock);
825 pr_warn_once("trying to dequeue a deleted mid\n");
826 } else {
827 list_del_init(&mid->qhead);
828 mid->mid_flags |= MID_DELETED;
829 spin_unlock(&mid->server->mid_lock);
830 }
831 }
832
833 static unsigned int
834 smb2_get_credits_from_hdr(char *buffer, struct TCP_Server_Info *server)
835 {
836 struct smb2_hdr *shdr = (struct smb2_hdr *)buffer;
837
838 /*
839 * SMB1 does not use credits.
840 */
841 if (is_smb1(server))
842 return 0;
843
844 return le16_to_cpu(shdr->CreditRequest);
845 }
846
847 static void
848 handle_mid(struct mid_q_entry *mid, struct TCP_Server_Info *server,
849 char *buf, int malformed)
850 {
851 if (server->ops->check_trans2 &&
852 server->ops->check_trans2(mid, server, buf, malformed))
853 return;
854 mid->credits_received = smb2_get_credits_from_hdr(buf, server);
855 mid->resp_buf = buf;
856 mid->large_buf = server->large_buf;
857 /* Was previous buf put in mpx struct for multi-rsp? */
858 if (!mid->multiRsp) {
859 /* smb buffer will be freed by user thread */
860 if (server->large_buf)
861 server->bigbuf = NULL;
862 else
863 server->smallbuf = NULL;
864 }
865 dequeue_mid(mid, malformed);
866 }
867
868 int
869 cifs_enable_signing(struct TCP_Server_Info *server, bool mnt_sign_required)
870 {
871 bool srv_sign_required = server->sec_mode & server->vals->signing_required;
872 bool srv_sign_enabled = server->sec_mode & server->vals->signing_enabled;
873 bool mnt_sign_enabled;
874
875 /*
876 * Is signing required by mnt options? If not then check
877 * global_secflags to see if it is there.
878 */
879 if (!mnt_sign_required)
880 mnt_sign_required = ((global_secflags & CIFSSEC_MUST_SIGN) ==
881 CIFSSEC_MUST_SIGN);
882
883 /*
884 * If signing is required then it's automatically enabled too,
885 * otherwise, check to see if the secflags allow it.
886 */
887 mnt_sign_enabled = mnt_sign_required ? mnt_sign_required :
888 (global_secflags & CIFSSEC_MAY_SIGN);
889
890 /* If server requires signing, does client allow it? */
891 if (srv_sign_required) {
892 if (!mnt_sign_enabled) {
893 cifs_dbg(VFS, "Server requires signing, but it's disabled in SecurityFlags!\n");
894 return -EOPNOTSUPP;
895 }
896 server->sign = true;
897 }
898
899 /* If client requires signing, does server allow it? */
900 if (mnt_sign_required) {
901 if (!srv_sign_enabled) {
902 cifs_dbg(VFS, "Server does not support signing!\n");
903 return -EOPNOTSUPP;
904 }
905 server->sign = true;
906 }
907
908 if (cifs_rdma_enabled(server) && server->sign)
909 cifs_dbg(VFS, "Signing is enabled, and RDMA read/write will be disabled\n");
910
911 return 0;
912 }
913
914 static noinline_for_stack void
915 clean_demultiplex_info(struct TCP_Server_Info *server)
916 {
917 int length;
918
919 /* take it off the list, if it's not already */
920 spin_lock(&server->srv_lock);
921 list_del_init(&server->tcp_ses_list);
922 spin_unlock(&server->srv_lock);
923
924 cancel_delayed_work_sync(&server->echo);
925
926 spin_lock(&server->srv_lock);
927 server->tcpStatus = CifsExiting;
928 spin_unlock(&server->srv_lock);
929 wake_up_all(&server->response_q);
930
931 /* check if we have blocked requests that need to free */
932 spin_lock(&server->req_lock);
933 if (server->credits <= 0)
934 server->credits = 1;
935 spin_unlock(&server->req_lock);
936 /*
937 * Although there should not be any requests blocked on this queue it
938 * can not hurt to be paranoid and try to wake up requests that may
939 * haven been blocked when more than 50 at time were on the wire to the
940 * same server - they now will see the session is in exit state and get
941 * out of SendReceive.
942 */
943 wake_up_all(&server->request_q);
944 /* give those requests time to exit */
945 msleep(125);
946 if (cifs_rdma_enabled(server))
947 smbd_destroy(server);
948 if (server->ssocket) {
949 sock_release(server->ssocket);
950 server->ssocket = NULL;
951 }
952
953 if (!list_empty(&server->pending_mid_q)) {
954 struct list_head dispose_list;
955 struct mid_q_entry *mid_entry;
956 struct list_head *tmp, *tmp2;
957
958 INIT_LIST_HEAD(&dispose_list);
959 spin_lock(&server->mid_lock);
960 list_for_each_safe(tmp, tmp2, &server->pending_mid_q) {
961 mid_entry = list_entry(tmp, struct mid_q_entry, qhead);
962 cifs_dbg(FYI, "Clearing mid %llu\n", mid_entry->mid);
963 kref_get(&mid_entry->refcount);
964 mid_entry->mid_state = MID_SHUTDOWN;
965 list_move(&mid_entry->qhead, &dispose_list);
966 mid_entry->mid_flags |= MID_DELETED;
967 }
968 spin_unlock(&server->mid_lock);
969
970 /* now walk dispose list and issue callbacks */
971 list_for_each_safe(tmp, tmp2, &dispose_list) {
972 mid_entry = list_entry(tmp, struct mid_q_entry, qhead);
973 cifs_dbg(FYI, "Callback mid %llu\n", mid_entry->mid);
974 list_del_init(&mid_entry->qhead);
975 mid_entry->callback(mid_entry);
976 release_mid(mid_entry);
977 }
978 /* 1/8th of sec is more than enough time for them to exit */
979 msleep(125);
980 }
981
982 if (!list_empty(&server->pending_mid_q)) {
983 /*
984 * mpx threads have not exited yet give them at least the smb
985 * send timeout time for long ops.
986 *
987 * Due to delays on oplock break requests, we need to wait at
988 * least 45 seconds before giving up on a request getting a
989 * response and going ahead and killing cifsd.
990 */
991 cifs_dbg(FYI, "Wait for exit from demultiplex thread\n");
992 msleep(46000);
993 /*
994 * If threads still have not exited they are probably never
995 * coming home not much else we can do but free the memory.
996 */
997 }
998
999 kfree(server->leaf_fullpath);
1000 kfree(server);
1001
1002 length = atomic_dec_return(&tcpSesAllocCount);
1003 if (length > 0)
1004 mempool_resize(cifs_req_poolp, length + cifs_min_rcv);
1005 }
1006
1007 static int
1008 standard_receive3(struct TCP_Server_Info *server, struct mid_q_entry *mid)
1009 {
1010 int length;
1011 char *buf = server->smallbuf;
1012 unsigned int pdu_length = server->pdu_size;
1013
1014 /* make sure this will fit in a large buffer */
1015 if (pdu_length > CIFSMaxBufSize + MAX_HEADER_SIZE(server) -
1016 HEADER_PREAMBLE_SIZE(server)) {
1017 cifs_server_dbg(VFS, "SMB response too long (%u bytes)\n", pdu_length);
1018 cifs_reconnect(server, true);
1019 return -ECONNABORTED;
1020 }
1021
1022 /* switch to large buffer if too big for a small one */
1023 if (pdu_length > MAX_CIFS_SMALL_BUFFER_SIZE - 4) {
1024 server->large_buf = true;
1025 memcpy(server->bigbuf, buf, server->total_read);
1026 buf = server->bigbuf;
1027 }
1028
1029 /* now read the rest */
1030 length = cifs_read_from_socket(server, buf + HEADER_SIZE(server) - 1,
1031 pdu_length - MID_HEADER_SIZE(server));
1032
1033 if (length < 0)
1034 return length;
1035 server->total_read += length;
1036
1037 dump_smb(buf, server->total_read);
1038
1039 return cifs_handle_standard(server, mid);
1040 }
1041
1042 int
1043 cifs_handle_standard(struct TCP_Server_Info *server, struct mid_q_entry *mid)
1044 {
1045 char *buf = server->large_buf ? server->bigbuf : server->smallbuf;
1046 int rc;
1047
1048 /*
1049 * We know that we received enough to get to the MID as we
1050 * checked the pdu_length earlier. Now check to see
1051 * if the rest of the header is OK.
1052 *
1053 * 48 bytes is enough to display the header and a little bit
1054 * into the payload for debugging purposes.
1055 */
1056 rc = server->ops->check_message(buf, server->total_read, server);
1057 if (rc)
1058 cifs_dump_mem("Bad SMB: ", buf,
1059 min_t(unsigned int, server->total_read, 48));
1060
1061 if (server->ops->is_session_expired &&
1062 server->ops->is_session_expired(buf)) {
1063 cifs_reconnect(server, true);
1064 return -1;
1065 }
1066
1067 if (server->ops->is_status_pending &&
1068 server->ops->is_status_pending(buf, server))
1069 return -1;
1070
1071 if (!mid)
1072 return rc;
1073
1074 handle_mid(mid, server, buf, rc);
1075 return 0;
1076 }
1077
1078 static void
1079 smb2_add_credits_from_hdr(char *buffer, struct TCP_Server_Info *server)
1080 {
1081 struct smb2_hdr *shdr = (struct smb2_hdr *)buffer;
1082 int scredits, in_flight;
1083
1084 /*
1085 * SMB1 does not use credits.
1086 */
1087 if (is_smb1(server))
1088 return;
1089
1090 if (shdr->CreditRequest) {
1091 spin_lock(&server->req_lock);
1092 server->credits += le16_to_cpu(shdr->CreditRequest);
1093 scredits = server->credits;
1094 in_flight = server->in_flight;
1095 spin_unlock(&server->req_lock);
1096 wake_up(&server->request_q);
1097
1098 trace_smb3_hdr_credits(server->CurrentMid,
1099 server->conn_id, server->hostname, scredits,
1100 le16_to_cpu(shdr->CreditRequest), in_flight);
1101 cifs_server_dbg(FYI, "%s: added %u credits total=%d\n",
1102 __func__, le16_to_cpu(shdr->CreditRequest),
1103 scredits);
1104 }
1105 }
1106
1107
1108 static int
1109 cifs_demultiplex_thread(void *p)
1110 {
1111 int i, num_mids, length;
1112 struct TCP_Server_Info *server = p;
1113 unsigned int pdu_length;
1114 unsigned int next_offset;
1115 char *buf = NULL;
1116 struct task_struct *task_to_wake = NULL;
1117 struct mid_q_entry *mids[MAX_COMPOUND];
1118 char *bufs[MAX_COMPOUND];
1119 unsigned int noreclaim_flag, num_io_timeout = 0;
1120 bool pending_reconnect = false;
1121
1122 noreclaim_flag = memalloc_noreclaim_save();
1123 cifs_dbg(FYI, "Demultiplex PID: %d\n", task_pid_nr(current));
1124
1125 length = atomic_inc_return(&tcpSesAllocCount);
1126 if (length > 1)
1127 mempool_resize(cifs_req_poolp, length + cifs_min_rcv);
1128
1129 set_freezable();
1130 allow_kernel_signal(SIGKILL);
1131 while (server->tcpStatus != CifsExiting) {
1132 if (try_to_freeze())
1133 continue;
1134
1135 if (!allocate_buffers(server))
1136 continue;
1137
1138 server->large_buf = false;
1139 buf = server->smallbuf;
1140 pdu_length = 4; /* enough to get RFC1001 header */
1141
1142 length = cifs_read_from_socket(server, buf, pdu_length);
1143 if (length < 0)
1144 continue;
1145
1146 if (is_smb1(server))
1147 server->total_read = length;
1148 else
1149 server->total_read = 0;
1150
1151 /*
1152 * The right amount was read from socket - 4 bytes,
1153 * so we can now interpret the length field.
1154 */
1155 pdu_length = get_rfc1002_length(buf);
1156
1157 cifs_dbg(FYI, "RFC1002 header 0x%x\n", pdu_length);
1158 if (!is_smb_response(server, buf[0]))
1159 continue;
1160
1161 pending_reconnect = false;
1162 next_pdu:
1163 server->pdu_size = pdu_length;
1164
1165 /* make sure we have enough to get to the MID */
1166 if (server->pdu_size < MID_HEADER_SIZE(server)) {
1167 cifs_server_dbg(VFS, "SMB response too short (%u bytes)\n",
1168 server->pdu_size);
1169 cifs_reconnect(server, true);
1170 continue;
1171 }
1172
1173 /* read down to the MID */
1174 length = cifs_read_from_socket(server,
1175 buf + HEADER_PREAMBLE_SIZE(server),
1176 MID_HEADER_SIZE(server));
1177 if (length < 0)
1178 continue;
1179 server->total_read += length;
1180
1181 if (server->ops->next_header) {
1182 next_offset = server->ops->next_header(buf);
1183 if (next_offset)
1184 server->pdu_size = next_offset;
1185 }
1186
1187 memset(mids, 0, sizeof(mids));
1188 memset(bufs, 0, sizeof(bufs));
1189 num_mids = 0;
1190
1191 if (server->ops->is_transform_hdr &&
1192 server->ops->receive_transform &&
1193 server->ops->is_transform_hdr(buf)) {
1194 length = server->ops->receive_transform(server,
1195 mids,
1196 bufs,
1197 &num_mids);
1198 } else {
1199 mids[0] = server->ops->find_mid(server, buf);
1200 bufs[0] = buf;
1201 num_mids = 1;
1202
1203 if (!mids[0] || !mids[0]->receive)
1204 length = standard_receive3(server, mids[0]);
1205 else
1206 length = mids[0]->receive(server, mids[0]);
1207 }
1208
1209 if (length < 0) {
1210 for (i = 0; i < num_mids; i++)
1211 if (mids[i])
1212 release_mid(mids[i]);
1213 continue;
1214 }
1215
1216 if (server->ops->is_status_io_timeout &&
1217 server->ops->is_status_io_timeout(buf)) {
1218 num_io_timeout++;
1219 if (num_io_timeout > MAX_STATUS_IO_TIMEOUT) {
1220 cifs_server_dbg(VFS,
1221 "Number of request timeouts exceeded %d. Reconnecting",
1222 MAX_STATUS_IO_TIMEOUT);
1223
1224 pending_reconnect = true;
1225 num_io_timeout = 0;
1226 }
1227 }
1228
1229 server->lstrp = jiffies;
1230
1231 for (i = 0; i < num_mids; i++) {
1232 if (mids[i] != NULL) {
1233 mids[i]->resp_buf_size = server->pdu_size;
1234
1235 if (bufs[i] != NULL) {
1236 if (server->ops->is_network_name_deleted &&
1237 server->ops->is_network_name_deleted(bufs[i],
1238 server)) {
1239 cifs_server_dbg(FYI,
1240 "Share deleted. Reconnect needed");
1241 }
1242 }
1243
1244 if (!mids[i]->multiRsp || mids[i]->multiEnd)
1245 mids[i]->callback(mids[i]);
1246
1247 release_mid(mids[i]);
1248 } else if (server->ops->is_oplock_break &&
1249 server->ops->is_oplock_break(bufs[i],
1250 server)) {
1251 smb2_add_credits_from_hdr(bufs[i], server);
1252 cifs_dbg(FYI, "Received oplock break\n");
1253 } else {
1254 cifs_server_dbg(VFS, "No task to wake, unknown frame received! NumMids %d\n",
1255 atomic_read(&mid_count));
1256 cifs_dump_mem("Received Data is: ", bufs[i],
1257 HEADER_SIZE(server));
1258 smb2_add_credits_from_hdr(bufs[i], server);
1259 #ifdef CONFIG_CIFS_DEBUG2
1260 if (server->ops->dump_detail)
1261 server->ops->dump_detail(bufs[i],
1262 server);
1263 cifs_dump_mids(server);
1264 #endif /* CIFS_DEBUG2 */
1265 }
1266 }
1267
1268 if (pdu_length > server->pdu_size) {
1269 if (!allocate_buffers(server))
1270 continue;
1271 pdu_length -= server->pdu_size;
1272 server->total_read = 0;
1273 server->large_buf = false;
1274 buf = server->smallbuf;
1275 goto next_pdu;
1276 }
1277
1278 /* do this reconnect at the very end after processing all MIDs */
1279 if (pending_reconnect)
1280 cifs_reconnect(server, true);
1281
1282 } /* end while !EXITING */
1283
1284 /* buffer usually freed in free_mid - need to free it here on exit */
1285 cifs_buf_release(server->bigbuf);
1286 if (server->smallbuf) /* no sense logging a debug message if NULL */
1287 cifs_small_buf_release(server->smallbuf);
1288
1289 task_to_wake = xchg(&server->tsk, NULL);
1290 clean_demultiplex_info(server);
1291
1292 /* if server->tsk was NULL then wait for a signal before exiting */
1293 if (!task_to_wake) {
1294 set_current_state(TASK_INTERRUPTIBLE);
1295 while (!signal_pending(current)) {
1296 schedule();
1297 set_current_state(TASK_INTERRUPTIBLE);
1298 }
1299 set_current_state(TASK_RUNNING);
1300 }
1301
1302 memalloc_noreclaim_restore(noreclaim_flag);
1303 module_put_and_kthread_exit(0);
1304 }
1305
1306 int
1307 cifs_ipaddr_cmp(struct sockaddr *srcaddr, struct sockaddr *rhs)
1308 {
1309 struct sockaddr_in *saddr4 = (struct sockaddr_in *)srcaddr;
1310 struct sockaddr_in *vaddr4 = (struct sockaddr_in *)rhs;
1311 struct sockaddr_in6 *saddr6 = (struct sockaddr_in6 *)srcaddr;
1312 struct sockaddr_in6 *vaddr6 = (struct sockaddr_in6 *)rhs;
1313
1314 switch (srcaddr->sa_family) {
1315 case AF_UNSPEC:
1316 switch (rhs->sa_family) {
1317 case AF_UNSPEC:
1318 return 0;
1319 case AF_INET:
1320 case AF_INET6:
1321 return 1;
1322 default:
1323 return -1;
1324 }
1325 case AF_INET: {
1326 switch (rhs->sa_family) {
1327 case AF_UNSPEC:
1328 return -1;
1329 case AF_INET:
1330 return memcmp(saddr4, vaddr4,
1331 sizeof(struct sockaddr_in));
1332 case AF_INET6:
1333 return 1;
1334 default:
1335 return -1;
1336 }
1337 }
1338 case AF_INET6: {
1339 switch (rhs->sa_family) {
1340 case AF_UNSPEC:
1341 case AF_INET:
1342 return -1;
1343 case AF_INET6:
1344 return memcmp(saddr6,
1345 vaddr6,
1346 sizeof(struct sockaddr_in6));
1347 default:
1348 return -1;
1349 }
1350 }
1351 default:
1352 return -1; /* don't expect to be here */
1353 }
1354 }
1355
1356 /*
1357 * Returns true if srcaddr isn't specified and rhs isn't specified, or
1358 * if srcaddr is specified and matches the IP address of the rhs argument
1359 */
1360 bool
1361 cifs_match_ipaddr(struct sockaddr *srcaddr, struct sockaddr *rhs)
1362 {
1363 switch (srcaddr->sa_family) {
1364 case AF_UNSPEC:
1365 return (rhs->sa_family == AF_UNSPEC);
1366 case AF_INET: {
1367 struct sockaddr_in *saddr4 = (struct sockaddr_in *)srcaddr;
1368 struct sockaddr_in *vaddr4 = (struct sockaddr_in *)rhs;
1369 return (saddr4->sin_addr.s_addr == vaddr4->sin_addr.s_addr);
1370 }
1371 case AF_INET6: {
1372 struct sockaddr_in6 *saddr6 = (struct sockaddr_in6 *)srcaddr;
1373 struct sockaddr_in6 *vaddr6 = (struct sockaddr_in6 *)rhs;
1374 return (ipv6_addr_equal(&saddr6->sin6_addr, &vaddr6->sin6_addr)
1375 && saddr6->sin6_scope_id == vaddr6->sin6_scope_id);
1376 }
1377 default:
1378 WARN_ON(1);
1379 return false; /* don't expect to be here */
1380 }
1381 }
1382
1383 /*
1384 * If no port is specified in addr structure, we try to match with 445 port
1385 * and if it fails - with 139 ports. It should be called only if address
1386 * families of server and addr are equal.
1387 */
1388 static bool
1389 match_port(struct TCP_Server_Info *server, struct sockaddr *addr)
1390 {
1391 __be16 port, *sport;
1392
1393 /* SMBDirect manages its own ports, don't match it here */
1394 if (server->rdma)
1395 return true;
1396
1397 switch (addr->sa_family) {
1398 case AF_INET:
1399 sport = &((struct sockaddr_in *) &server->dstaddr)->sin_port;
1400 port = ((struct sockaddr_in *) addr)->sin_port;
1401 break;
1402 case AF_INET6:
1403 sport = &((struct sockaddr_in6 *) &server->dstaddr)->sin6_port;
1404 port = ((struct sockaddr_in6 *) addr)->sin6_port;
1405 break;
1406 default:
1407 WARN_ON(1);
1408 return false;
1409 }
1410
1411 if (!port) {
1412 port = htons(CIFS_PORT);
1413 if (port == *sport)
1414 return true;
1415
1416 port = htons(RFC1001_PORT);
1417 }
1418
1419 return port == *sport;
1420 }
1421
1422 static bool match_server_address(struct TCP_Server_Info *server, struct sockaddr *addr)
1423 {
1424 if (!cifs_match_ipaddr(addr, (struct sockaddr *)&server->dstaddr))
1425 return false;
1426
1427 return true;
1428 }
1429
1430 static bool
1431 match_security(struct TCP_Server_Info *server, struct smb3_fs_context *ctx)
1432 {
1433 /*
1434 * The select_sectype function should either return the ctx->sectype
1435 * that was specified, or "Unspecified" if that sectype was not
1436 * compatible with the given NEGOTIATE request.
1437 */
1438 if (server->ops->select_sectype(server, ctx->sectype)
1439 == Unspecified)
1440 return false;
1441
1442 /*
1443 * Now check if signing mode is acceptable. No need to check
1444 * global_secflags at this point since if MUST_SIGN is set then
1445 * the server->sign had better be too.
1446 */
1447 if (ctx->sign && !server->sign)
1448 return false;
1449
1450 return true;
1451 }
1452
1453 /* this function must be called with srv_lock held */
1454 static int match_server(struct TCP_Server_Info *server,
1455 struct smb3_fs_context *ctx,
1456 bool match_super)
1457 {
1458 struct sockaddr *addr = (struct sockaddr *)&ctx->dstaddr;
1459
1460 lockdep_assert_held(&server->srv_lock);
1461
1462 if (ctx->nosharesock)
1463 return 0;
1464
1465 /* this server does not share socket */
1466 if (server->nosharesock)
1467 return 0;
1468
1469 /* If multidialect negotiation see if existing sessions match one */
1470 if (strcmp(ctx->vals->version_string, SMB3ANY_VERSION_STRING) == 0) {
1471 if (server->vals->protocol_id < SMB30_PROT_ID)
1472 return 0;
1473 } else if (strcmp(ctx->vals->version_string,
1474 SMBDEFAULT_VERSION_STRING) == 0) {
1475 if (server->vals->protocol_id < SMB21_PROT_ID)
1476 return 0;
1477 } else if ((server->vals != ctx->vals) || (server->ops != ctx->ops))
1478 return 0;
1479
1480 if (!net_eq(cifs_net_ns(server), current->nsproxy->net_ns))
1481 return 0;
1482
1483 if (!cifs_match_ipaddr((struct sockaddr *)&ctx->srcaddr,
1484 (struct sockaddr *)&server->srcaddr))
1485 return 0;
1486 /*
1487 * When matching cifs.ko superblocks (@match_super == true), we can't
1488 * really match either @server->leaf_fullpath or @server->dstaddr
1489 * directly since this @server might belong to a completely different
1490 * server -- in case of domain-based DFS referrals or DFS links -- as
1491 * provided earlier by mount(2) through 'source' and 'ip' options.
1492 *
1493 * Otherwise, match the DFS referral in @server->leaf_fullpath or the
1494 * destination address in @server->dstaddr.
1495 *
1496 * When using 'nodfs' mount option, we avoid sharing it with DFS
1497 * connections as they might failover.
1498 */
1499 if (!match_super) {
1500 if (!ctx->nodfs) {
1501 if (server->leaf_fullpath) {
1502 if (!ctx->leaf_fullpath ||
1503 strcasecmp(server->leaf_fullpath,
1504 ctx->leaf_fullpath))
1505 return 0;
1506 } else if (ctx->leaf_fullpath) {
1507 return 0;
1508 }
1509 } else if (server->leaf_fullpath) {
1510 return 0;
1511 }
1512 }
1513
1514 /*
1515 * Match for a regular connection (address/hostname/port) which has no
1516 * DFS referrals set.
1517 */
1518 if (!server->leaf_fullpath &&
1519 (strcasecmp(server->hostname, ctx->server_hostname) ||
1520 !match_server_address(server, addr) ||
1521 !match_port(server, addr)))
1522 return 0;
1523
1524 if (!match_security(server, ctx))
1525 return 0;
1526
1527 if (server->echo_interval != ctx->echo_interval * HZ)
1528 return 0;
1529
1530 if (server->rdma != ctx->rdma)
1531 return 0;
1532
1533 if (server->ignore_signature != ctx->ignore_signature)
1534 return 0;
1535
1536 if (server->min_offload != ctx->min_offload)
1537 return 0;
1538
1539 return 1;
1540 }
1541
1542 struct TCP_Server_Info *
1543 cifs_find_tcp_session(struct smb3_fs_context *ctx)
1544 {
1545 struct TCP_Server_Info *server;
1546
1547 spin_lock(&cifs_tcp_ses_lock);
1548 list_for_each_entry(server, &cifs_tcp_ses_list, tcp_ses_list) {
1549 spin_lock(&server->srv_lock);
1550 /*
1551 * Skip ses channels since they're only handled in lower layers
1552 * (e.g. cifs_send_recv).
1553 */
1554 if (SERVER_IS_CHAN(server) ||
1555 !match_server(server, ctx, false)) {
1556 spin_unlock(&server->srv_lock);
1557 continue;
1558 }
1559 spin_unlock(&server->srv_lock);
1560
1561 ++server->srv_count;
1562 spin_unlock(&cifs_tcp_ses_lock);
1563 cifs_dbg(FYI, "Existing tcp session with server found\n");
1564 return server;
1565 }
1566 spin_unlock(&cifs_tcp_ses_lock);
1567 return NULL;
1568 }
1569
1570 void
1571 cifs_put_tcp_session(struct TCP_Server_Info *server, int from_reconnect)
1572 {
1573 struct task_struct *task;
1574
1575 spin_lock(&cifs_tcp_ses_lock);
1576 if (--server->srv_count > 0) {
1577 spin_unlock(&cifs_tcp_ses_lock);
1578 return;
1579 }
1580
1581 /* srv_count can never go negative */
1582 WARN_ON(server->srv_count < 0);
1583
1584 put_net(cifs_net_ns(server));
1585
1586 list_del_init(&server->tcp_ses_list);
1587 spin_unlock(&cifs_tcp_ses_lock);
1588
1589 /* For secondary channels, we pick up ref-count on the primary server */
1590 if (SERVER_IS_CHAN(server))
1591 cifs_put_tcp_session(server->primary_server, from_reconnect);
1592
1593 cancel_delayed_work_sync(&server->echo);
1594
1595 if (from_reconnect)
1596 /*
1597 * Avoid deadlock here: reconnect work calls
1598 * cifs_put_tcp_session() at its end. Need to be sure
1599 * that reconnect work does nothing with server pointer after
1600 * that step.
1601 */
1602 cancel_delayed_work(&server->reconnect);
1603 else
1604 cancel_delayed_work_sync(&server->reconnect);
1605
1606 spin_lock(&server->srv_lock);
1607 server->tcpStatus = CifsExiting;
1608 spin_unlock(&server->srv_lock);
1609
1610 cifs_crypto_secmech_release(server);
1611
1612 kfree_sensitive(server->session_key.response);
1613 server->session_key.response = NULL;
1614 server->session_key.len = 0;
1615 kfree(server->hostname);
1616 server->hostname = NULL;
1617
1618 task = xchg(&server->tsk, NULL);
1619 if (task)
1620 send_sig(SIGKILL, task, 1);
1621 }
1622
1623 struct TCP_Server_Info *
1624 cifs_get_tcp_session(struct smb3_fs_context *ctx,
1625 struct TCP_Server_Info *primary_server)
1626 {
1627 struct TCP_Server_Info *tcp_ses = NULL;
1628 int rc;
1629
1630 cifs_dbg(FYI, "UNC: %s\n", ctx->UNC);
1631
1632 /* see if we already have a matching tcp_ses */
1633 tcp_ses = cifs_find_tcp_session(ctx);
1634 if (tcp_ses)
1635 return tcp_ses;
1636
1637 tcp_ses = kzalloc(sizeof(struct TCP_Server_Info), GFP_KERNEL);
1638 if (!tcp_ses) {
1639 rc = -ENOMEM;
1640 goto out_err;
1641 }
1642
1643 tcp_ses->hostname = kstrdup(ctx->server_hostname, GFP_KERNEL);
1644 if (!tcp_ses->hostname) {
1645 rc = -ENOMEM;
1646 goto out_err;
1647 }
1648
1649 if (ctx->leaf_fullpath) {
1650 tcp_ses->leaf_fullpath = kstrdup(ctx->leaf_fullpath, GFP_KERNEL);
1651 if (!tcp_ses->leaf_fullpath) {
1652 rc = -ENOMEM;
1653 goto out_err;
1654 }
1655 }
1656
1657 if (ctx->nosharesock)
1658 tcp_ses->nosharesock = true;
1659
1660 tcp_ses->ops = ctx->ops;
1661 tcp_ses->vals = ctx->vals;
1662 cifs_set_net_ns(tcp_ses, get_net(current->nsproxy->net_ns));
1663
1664 tcp_ses->conn_id = atomic_inc_return(&tcpSesNextId);
1665 tcp_ses->noblockcnt = ctx->rootfs;
1666 tcp_ses->noblocksnd = ctx->noblocksnd || ctx->rootfs;
1667 tcp_ses->noautotune = ctx->noautotune;
1668 tcp_ses->tcp_nodelay = ctx->sockopt_tcp_nodelay;
1669 tcp_ses->rdma = ctx->rdma;
1670 tcp_ses->in_flight = 0;
1671 tcp_ses->max_in_flight = 0;
1672 tcp_ses->credits = 1;
1673 if (primary_server) {
1674 spin_lock(&cifs_tcp_ses_lock);
1675 ++primary_server->srv_count;
1676 spin_unlock(&cifs_tcp_ses_lock);
1677 tcp_ses->primary_server = primary_server;
1678 }
1679 init_waitqueue_head(&tcp_ses->response_q);
1680 init_waitqueue_head(&tcp_ses->request_q);
1681 INIT_LIST_HEAD(&tcp_ses->pending_mid_q);
1682 mutex_init(&tcp_ses->_srv_mutex);
1683 memcpy(tcp_ses->workstation_RFC1001_name,
1684 ctx->source_rfc1001_name, RFC1001_NAME_LEN_WITH_NULL);
1685 memcpy(tcp_ses->server_RFC1001_name,
1686 ctx->target_rfc1001_name, RFC1001_NAME_LEN_WITH_NULL);
1687 tcp_ses->session_estab = false;
1688 tcp_ses->sequence_number = 0;
1689 tcp_ses->channel_sequence_num = 0; /* only tracked for primary channel */
1690 tcp_ses->reconnect_instance = 1;
1691 tcp_ses->lstrp = jiffies;
1692 tcp_ses->compress_algorithm = cpu_to_le16(ctx->compression);
1693 spin_lock_init(&tcp_ses->req_lock);
1694 spin_lock_init(&tcp_ses->srv_lock);
1695 spin_lock_init(&tcp_ses->mid_lock);
1696 INIT_LIST_HEAD(&tcp_ses->tcp_ses_list);
1697 INIT_LIST_HEAD(&tcp_ses->smb_ses_list);
1698 INIT_DELAYED_WORK(&tcp_ses->echo, cifs_echo_request);
1699 INIT_DELAYED_WORK(&tcp_ses->reconnect, smb2_reconnect_server);
1700 mutex_init(&tcp_ses->reconnect_mutex);
1701 #ifdef CONFIG_CIFS_DFS_UPCALL
1702 mutex_init(&tcp_ses->refpath_lock);
1703 #endif
1704 memcpy(&tcp_ses->srcaddr, &ctx->srcaddr,
1705 sizeof(tcp_ses->srcaddr));
1706 memcpy(&tcp_ses->dstaddr, &ctx->dstaddr,
1707 sizeof(tcp_ses->dstaddr));
1708 if (ctx->use_client_guid)
1709 memcpy(tcp_ses->client_guid, ctx->client_guid,
1710 SMB2_CLIENT_GUID_SIZE);
1711 else
1712 generate_random_uuid(tcp_ses->client_guid);
1713 /*
1714 * at this point we are the only ones with the pointer
1715 * to the struct since the kernel thread not created yet
1716 * no need to spinlock this init of tcpStatus or srv_count
1717 */
1718 tcp_ses->tcpStatus = CifsNew;
1719 ++tcp_ses->srv_count;
1720
1721 if (ctx->echo_interval >= SMB_ECHO_INTERVAL_MIN &&
1722 ctx->echo_interval <= SMB_ECHO_INTERVAL_MAX)
1723 tcp_ses->echo_interval = ctx->echo_interval * HZ;
1724 else
1725 tcp_ses->echo_interval = SMB_ECHO_INTERVAL_DEFAULT * HZ;
1726 if (tcp_ses->rdma) {
1727 #ifndef CONFIG_CIFS_SMB_DIRECT
1728 cifs_dbg(VFS, "CONFIG_CIFS_SMB_DIRECT is not enabled\n");
1729 rc = -ENOENT;
1730 goto out_err_crypto_release;
1731 #endif
1732 tcp_ses->smbd_conn = smbd_get_connection(
1733 tcp_ses, (struct sockaddr *)&ctx->dstaddr);
1734 if (tcp_ses->smbd_conn) {
1735 cifs_dbg(VFS, "RDMA transport established\n");
1736 rc = 0;
1737 goto smbd_connected;
1738 } else {
1739 rc = -ENOENT;
1740 goto out_err_crypto_release;
1741 }
1742 }
1743 rc = ip_connect(tcp_ses);
1744 if (rc < 0) {
1745 cifs_dbg(VFS, "Error connecting to socket. Aborting operation.\n");
1746 goto out_err_crypto_release;
1747 }
1748 smbd_connected:
1749 /*
1750 * since we're in a cifs function already, we know that
1751 * this will succeed. No need for try_module_get().
1752 */
1753 __module_get(THIS_MODULE);
1754 tcp_ses->tsk = kthread_run(cifs_demultiplex_thread,
1755 tcp_ses, "cifsd");
1756 if (IS_ERR(tcp_ses->tsk)) {
1757 rc = PTR_ERR(tcp_ses->tsk);
1758 cifs_dbg(VFS, "error %d create cifsd thread\n", rc);
1759 module_put(THIS_MODULE);
1760 goto out_err_crypto_release;
1761 }
1762 tcp_ses->min_offload = ctx->min_offload;
1763 /*
1764 * at this point we are the only ones with the pointer
1765 * to the struct since the kernel thread not created yet
1766 * no need to spinlock this update of tcpStatus
1767 */
1768 spin_lock(&tcp_ses->srv_lock);
1769 tcp_ses->tcpStatus = CifsNeedNegotiate;
1770 spin_unlock(&tcp_ses->srv_lock);
1771
1772 if ((ctx->max_credits < 20) || (ctx->max_credits > 60000))
1773 tcp_ses->max_credits = SMB2_MAX_CREDITS_AVAILABLE;
1774 else
1775 tcp_ses->max_credits = ctx->max_credits;
1776
1777 tcp_ses->nr_targets = 1;
1778 tcp_ses->ignore_signature = ctx->ignore_signature;
1779 /* thread spawned, put it on the list */
1780 spin_lock(&cifs_tcp_ses_lock);
1781 list_add(&tcp_ses->tcp_ses_list, &cifs_tcp_ses_list);
1782 spin_unlock(&cifs_tcp_ses_lock);
1783
1784 /* queue echo request delayed work */
1785 queue_delayed_work(cifsiod_wq, &tcp_ses->echo, tcp_ses->echo_interval);
1786
1787 return tcp_ses;
1788
1789 out_err_crypto_release:
1790 cifs_crypto_secmech_release(tcp_ses);
1791
1792 put_net(cifs_net_ns(tcp_ses));
1793
1794 out_err:
1795 if (tcp_ses) {
1796 if (SERVER_IS_CHAN(tcp_ses))
1797 cifs_put_tcp_session(tcp_ses->primary_server, false);
1798 kfree(tcp_ses->hostname);
1799 kfree(tcp_ses->leaf_fullpath);
1800 if (tcp_ses->ssocket)
1801 sock_release(tcp_ses->ssocket);
1802 kfree(tcp_ses);
1803 }
1804 return ERR_PTR(rc);
1805 }
1806
1807 /* this function must be called with ses_lock and chan_lock held */
1808 static int match_session(struct cifs_ses *ses, struct smb3_fs_context *ctx)
1809 {
1810 if (ctx->sectype != Unspecified &&
1811 ctx->sectype != ses->sectype)
1812 return 0;
1813
1814 /*
1815 * If an existing session is limited to less channels than
1816 * requested, it should not be reused
1817 */
1818 if (ses->chan_max < ctx->max_channels)
1819 return 0;
1820
1821 switch (ses->sectype) {
1822 case Kerberos:
1823 if (!uid_eq(ctx->cred_uid, ses->cred_uid))
1824 return 0;
1825 break;
1826 default:
1827 /* NULL username means anonymous session */
1828 if (ses->user_name == NULL) {
1829 if (!ctx->nullauth)
1830 return 0;
1831 break;
1832 }
1833
1834 /* anything else takes username/password */
1835 if (strncmp(ses->user_name,
1836 ctx->username ? ctx->username : "",
1837 CIFS_MAX_USERNAME_LEN))
1838 return 0;
1839 if ((ctx->username && strlen(ctx->username) != 0) &&
1840 ses->password != NULL &&
1841 strncmp(ses->password,
1842 ctx->password ? ctx->password : "",
1843 CIFS_MAX_PASSWORD_LEN))
1844 return 0;
1845 }
1846
1847 if (strcmp(ctx->local_nls->charset, ses->local_nls->charset))
1848 return 0;
1849
1850 return 1;
1851 }
1852
1853 /**
1854 * cifs_setup_ipc - helper to setup the IPC tcon for the session
1855 * @ses: smb session to issue the request on
1856 * @ctx: the superblock configuration context to use for building the
1857 * new tree connection for the IPC (interprocess communication RPC)
1858 *
1859 * A new IPC connection is made and stored in the session
1860 * tcon_ipc. The IPC tcon has the same lifetime as the session.
1861 */
1862 static int
1863 cifs_setup_ipc(struct cifs_ses *ses, struct smb3_fs_context *ctx)
1864 {
1865 int rc = 0, xid;
1866 struct cifs_tcon *tcon;
1867 char unc[SERVER_NAME_LENGTH + sizeof("//x/IPC$")] = {0};
1868 bool seal = false;
1869 struct TCP_Server_Info *server = ses->server;
1870
1871 /*
1872 * If the mount request that resulted in the creation of the
1873 * session requires encryption, force IPC to be encrypted too.
1874 */
1875 if (ctx->seal) {
1876 if (server->capabilities & SMB2_GLOBAL_CAP_ENCRYPTION)
1877 seal = true;
1878 else {
1879 cifs_server_dbg(VFS,
1880 "IPC: server doesn't support encryption\n");
1881 return -EOPNOTSUPP;
1882 }
1883 }
1884
1885 tcon = tconInfoAlloc();
1886 if (tcon == NULL)
1887 return -ENOMEM;
1888
1889 spin_lock(&server->srv_lock);
1890 scnprintf(unc, sizeof(unc), "\\\\%s\\IPC$", server->hostname);
1891 spin_unlock(&server->srv_lock);
1892
1893 xid = get_xid();
1894 tcon->ses = ses;
1895 tcon->ipc = true;
1896 tcon->seal = seal;
1897 rc = server->ops->tree_connect(xid, ses, unc, tcon, ctx->local_nls);
1898 free_xid(xid);
1899
1900 if (rc) {
1901 cifs_server_dbg(VFS, "failed to connect to IPC (rc=%d)\n", rc);
1902 tconInfoFree(tcon);
1903 goto out;
1904 }
1905
1906 cifs_dbg(FYI, "IPC tcon rc=%d ipc tid=0x%x\n", rc, tcon->tid);
1907
1908 spin_lock(&tcon->tc_lock);
1909 tcon->status = TID_GOOD;
1910 spin_unlock(&tcon->tc_lock);
1911 ses->tcon_ipc = tcon;
1912 out:
1913 return rc;
1914 }
1915
1916 /**
1917 * cifs_free_ipc - helper to release the session IPC tcon
1918 * @ses: smb session to unmount the IPC from
1919 *
1920 * Needs to be called everytime a session is destroyed.
1921 *
1922 * On session close, the IPC is closed and the server must release all tcons of the session.
1923 * No need to send a tree disconnect here.
1924 *
1925 * Besides, it will make the server to not close durable and resilient files on session close, as
1926 * specified in MS-SMB2 3.3.5.6 Receiving an SMB2 LOGOFF Request.
1927 */
1928 static int
1929 cifs_free_ipc(struct cifs_ses *ses)
1930 {
1931 struct cifs_tcon *tcon = ses->tcon_ipc;
1932
1933 if (tcon == NULL)
1934 return 0;
1935
1936 tconInfoFree(tcon);
1937 ses->tcon_ipc = NULL;
1938 return 0;
1939 }
1940
1941 static struct cifs_ses *
1942 cifs_find_smb_ses(struct TCP_Server_Info *server, struct smb3_fs_context *ctx)
1943 {
1944 struct cifs_ses *ses, *ret = NULL;
1945
1946 spin_lock(&cifs_tcp_ses_lock);
1947 list_for_each_entry(ses, &server->smb_ses_list, smb_ses_list) {
1948 spin_lock(&ses->ses_lock);
1949 if (ses->ses_status == SES_EXITING) {
1950 spin_unlock(&ses->ses_lock);
1951 continue;
1952 }
1953 spin_lock(&ses->chan_lock);
1954 if (match_session(ses, ctx)) {
1955 spin_unlock(&ses->chan_lock);
1956 spin_unlock(&ses->ses_lock);
1957 ret = ses;
1958 break;
1959 }
1960 spin_unlock(&ses->chan_lock);
1961 spin_unlock(&ses->ses_lock);
1962 }
1963 if (ret)
1964 cifs_smb_ses_inc_refcount(ret);
1965 spin_unlock(&cifs_tcp_ses_lock);
1966 return ret;
1967 }
1968
1969 void __cifs_put_smb_ses(struct cifs_ses *ses)
1970 {
1971 unsigned int rc, xid;
1972 unsigned int chan_count;
1973 struct TCP_Server_Info *server = ses->server;
1974
1975 spin_lock(&ses->ses_lock);
1976 if (ses->ses_status == SES_EXITING) {
1977 spin_unlock(&ses->ses_lock);
1978 return;
1979 }
1980 spin_unlock(&ses->ses_lock);
1981
1982 cifs_dbg(FYI, "%s: ses_count=%d\n", __func__, ses->ses_count);
1983 cifs_dbg(FYI,
1984 "%s: ses ipc: %s\n", __func__, ses->tcon_ipc ? ses->tcon_ipc->tree_name : "NONE");
1985
1986 spin_lock(&cifs_tcp_ses_lock);
1987 if (--ses->ses_count > 0) {
1988 spin_unlock(&cifs_tcp_ses_lock);
1989 return;
1990 }
1991 spin_lock(&ses->ses_lock);
1992 if (ses->ses_status == SES_GOOD)
1993 ses->ses_status = SES_EXITING;
1994 spin_unlock(&ses->ses_lock);
1995 spin_unlock(&cifs_tcp_ses_lock);
1996
1997 /* ses_count can never go negative */
1998 WARN_ON(ses->ses_count < 0);
1999
2000 spin_lock(&ses->ses_lock);
2001 if (ses->ses_status == SES_EXITING && server->ops->logoff) {
2002 spin_unlock(&ses->ses_lock);
2003 cifs_free_ipc(ses);
2004 xid = get_xid();
2005 rc = server->ops->logoff(xid, ses);
2006 if (rc)
2007 cifs_server_dbg(VFS, "%s: Session Logoff failure rc=%d\n",
2008 __func__, rc);
2009 _free_xid(xid);
2010 } else {
2011 spin_unlock(&ses->ses_lock);
2012 cifs_free_ipc(ses);
2013 }
2014
2015 spin_lock(&cifs_tcp_ses_lock);
2016 list_del_init(&ses->smb_ses_list);
2017 spin_unlock(&cifs_tcp_ses_lock);
2018
2019 chan_count = ses->chan_count;
2020
2021 /* close any extra channels */
2022 if (chan_count > 1) {
2023 int i;
2024
2025 for (i = 1; i < chan_count; i++) {
2026 if (ses->chans[i].iface) {
2027 kref_put(&ses->chans[i].iface->refcount, release_iface);
2028 ses->chans[i].iface = NULL;
2029 }
2030 cifs_put_tcp_session(ses->chans[i].server, 0);
2031 ses->chans[i].server = NULL;
2032 }
2033 }
2034
2035 sesInfoFree(ses);
2036 cifs_put_tcp_session(server, 0);
2037 }
2038
2039 #ifdef CONFIG_KEYS
2040
2041 /* strlen("cifs:a:") + CIFS_MAX_DOMAINNAME_LEN + 1 */
2042 #define CIFSCREDS_DESC_SIZE (7 + CIFS_MAX_DOMAINNAME_LEN + 1)
2043
2044 /* Populate username and pw fields from keyring if possible */
2045 static int
2046 cifs_set_cifscreds(struct smb3_fs_context *ctx, struct cifs_ses *ses)
2047 {
2048 int rc = 0;
2049 int is_domain = 0;
2050 const char *delim, *payload;
2051 char *desc;
2052 ssize_t len;
2053 struct key *key;
2054 struct TCP_Server_Info *server = ses->server;
2055 struct sockaddr_in *sa;
2056 struct sockaddr_in6 *sa6;
2057 const struct user_key_payload *upayload;
2058
2059 desc = kmalloc(CIFSCREDS_DESC_SIZE, GFP_KERNEL);
2060 if (!desc)
2061 return -ENOMEM;
2062
2063 /* try to find an address key first */
2064 switch (server->dstaddr.ss_family) {
2065 case AF_INET:
2066 sa = (struct sockaddr_in *)&server->dstaddr;
2067 sprintf(desc, "cifs:a:%pI4", &sa->sin_addr.s_addr);
2068 break;
2069 case AF_INET6:
2070 sa6 = (struct sockaddr_in6 *)&server->dstaddr;
2071 sprintf(desc, "cifs:a:%pI6c", &sa6->sin6_addr.s6_addr);
2072 break;
2073 default:
2074 cifs_dbg(FYI, "Bad ss_family (%hu)\n",
2075 server->dstaddr.ss_family);
2076 rc = -EINVAL;
2077 goto out_err;
2078 }
2079
2080 cifs_dbg(FYI, "%s: desc=%s\n", __func__, desc);
2081 key = request_key(&key_type_logon, desc, "");
2082 if (IS_ERR(key)) {
2083 if (!ses->domainName) {
2084 cifs_dbg(FYI, "domainName is NULL\n");
2085 rc = PTR_ERR(key);
2086 goto out_err;
2087 }
2088
2089 /* didn't work, try to find a domain key */
2090 sprintf(desc, "cifs:d:%s", ses->domainName);
2091 cifs_dbg(FYI, "%s: desc=%s\n", __func__, desc);
2092 key = request_key(&key_type_logon, desc, "");
2093 if (IS_ERR(key)) {
2094 rc = PTR_ERR(key);
2095 goto out_err;
2096 }
2097 is_domain = 1;
2098 }
2099
2100 down_read(&key->sem);
2101 upayload = user_key_payload_locked(key);
2102 if (IS_ERR_OR_NULL(upayload)) {
2103 rc = upayload ? PTR_ERR(upayload) : -EINVAL;
2104 goto out_key_put;
2105 }
2106
2107 /* find first : in payload */
2108 payload = upayload->data;
2109 delim = strnchr(payload, upayload->datalen, ':');
2110 cifs_dbg(FYI, "payload=%s\n", payload);
2111 if (!delim) {
2112 cifs_dbg(FYI, "Unable to find ':' in payload (datalen=%d)\n",
2113 upayload->datalen);
2114 rc = -EINVAL;
2115 goto out_key_put;
2116 }
2117
2118 len = delim - payload;
2119 if (len > CIFS_MAX_USERNAME_LEN || len <= 0) {
2120 cifs_dbg(FYI, "Bad value from username search (len=%zd)\n",
2121 len);
2122 rc = -EINVAL;
2123 goto out_key_put;
2124 }
2125
2126 ctx->username = kstrndup(payload, len, GFP_KERNEL);
2127 if (!ctx->username) {
2128 cifs_dbg(FYI, "Unable to allocate %zd bytes for username\n",
2129 len);
2130 rc = -ENOMEM;
2131 goto out_key_put;
2132 }
2133 cifs_dbg(FYI, "%s: username=%s\n", __func__, ctx->username);
2134
2135 len = key->datalen - (len + 1);
2136 if (len > CIFS_MAX_PASSWORD_LEN || len <= 0) {
2137 cifs_dbg(FYI, "Bad len for password search (len=%zd)\n", len);
2138 rc = -EINVAL;
2139 kfree(ctx->username);
2140 ctx->username = NULL;
2141 goto out_key_put;
2142 }
2143
2144 ++delim;
2145 ctx->password = kstrndup(delim, len, GFP_KERNEL);
2146 if (!ctx->password) {
2147 cifs_dbg(FYI, "Unable to allocate %zd bytes for password\n",
2148 len);
2149 rc = -ENOMEM;
2150 kfree(ctx->username);
2151 ctx->username = NULL;
2152 goto out_key_put;
2153 }
2154
2155 /*
2156 * If we have a domain key then we must set the domainName in the
2157 * for the request.
2158 */
2159 if (is_domain && ses->domainName) {
2160 ctx->domainname = kstrdup(ses->domainName, GFP_KERNEL);
2161 if (!ctx->domainname) {
2162 cifs_dbg(FYI, "Unable to allocate %zd bytes for domain\n",
2163 len);
2164 rc = -ENOMEM;
2165 kfree(ctx->username);
2166 ctx->username = NULL;
2167 kfree_sensitive(ctx->password);
2168 ctx->password = NULL;
2169 goto out_key_put;
2170 }
2171 }
2172
2173 strscpy(ctx->workstation_name, ses->workstation_name, sizeof(ctx->workstation_name));
2174
2175 out_key_put:
2176 up_read(&key->sem);
2177 key_put(key);
2178 out_err:
2179 kfree(desc);
2180 cifs_dbg(FYI, "%s: returning %d\n", __func__, rc);
2181 return rc;
2182 }
2183 #else /* ! CONFIG_KEYS */
2184 static inline int
2185 cifs_set_cifscreds(struct smb3_fs_context *ctx __attribute__((unused)),
2186 struct cifs_ses *ses __attribute__((unused)))
2187 {
2188 return -ENOSYS;
2189 }
2190 #endif /* CONFIG_KEYS */
2191
2192 /**
2193 * cifs_get_smb_ses - get a session matching @ctx data from @server
2194 * @server: server to setup the session to
2195 * @ctx: superblock configuration context to use to setup the session
2196 *
2197 * This function assumes it is being called from cifs_mount() where we
2198 * already got a server reference (server refcount +1). See
2199 * cifs_get_tcon() for refcount explanations.
2200 */
2201 struct cifs_ses *
2202 cifs_get_smb_ses(struct TCP_Server_Info *server, struct smb3_fs_context *ctx)
2203 {
2204 int rc = 0;
2205 unsigned int xid;
2206 struct cifs_ses *ses;
2207 struct sockaddr_in *addr = (struct sockaddr_in *)&server->dstaddr;
2208 struct sockaddr_in6 *addr6 = (struct sockaddr_in6 *)&server->dstaddr;
2209
2210 xid = get_xid();
2211
2212 ses = cifs_find_smb_ses(server, ctx);
2213 if (ses) {
2214 cifs_dbg(FYI, "Existing smb sess found (status=%d)\n",
2215 ses->ses_status);
2216
2217 spin_lock(&ses->chan_lock);
2218 if (cifs_chan_needs_reconnect(ses, server)) {
2219 spin_unlock(&ses->chan_lock);
2220 cifs_dbg(FYI, "Session needs reconnect\n");
2221
2222 mutex_lock(&ses->session_mutex);
2223 rc = cifs_negotiate_protocol(xid, ses, server);
2224 if (rc) {
2225 mutex_unlock(&ses->session_mutex);
2226 /* problem -- put our ses reference */
2227 cifs_put_smb_ses(ses);
2228 free_xid(xid);
2229 return ERR_PTR(rc);
2230 }
2231
2232 rc = cifs_setup_session(xid, ses, server,
2233 ctx->local_nls);
2234 if (rc) {
2235 mutex_unlock(&ses->session_mutex);
2236 /* problem -- put our reference */
2237 cifs_put_smb_ses(ses);
2238 free_xid(xid);
2239 return ERR_PTR(rc);
2240 }
2241 mutex_unlock(&ses->session_mutex);
2242
2243 spin_lock(&ses->chan_lock);
2244 }
2245 spin_unlock(&ses->chan_lock);
2246
2247 /* existing SMB ses has a server reference already */
2248 cifs_put_tcp_session(server, 0);
2249 free_xid(xid);
2250 return ses;
2251 }
2252
2253 rc = -ENOMEM;
2254
2255 cifs_dbg(FYI, "Existing smb sess not found\n");
2256 ses = sesInfoAlloc();
2257 if (ses == NULL)
2258 goto get_ses_fail;
2259
2260 /* new SMB session uses our server ref */
2261 ses->server = server;
2262 if (server->dstaddr.ss_family == AF_INET6)
2263 sprintf(ses->ip_addr, "%pI6", &addr6->sin6_addr);
2264 else
2265 sprintf(ses->ip_addr, "%pI4", &addr->sin_addr);
2266
2267 if (ctx->username) {
2268 ses->user_name = kstrdup(ctx->username, GFP_KERNEL);
2269 if (!ses->user_name)
2270 goto get_ses_fail;
2271 }
2272
2273 /* ctx->password freed at unmount */
2274 if (ctx->password) {
2275 ses->password = kstrdup(ctx->password, GFP_KERNEL);
2276 if (!ses->password)
2277 goto get_ses_fail;
2278 }
2279 if (ctx->domainname) {
2280 ses->domainName = kstrdup(ctx->domainname, GFP_KERNEL);
2281 if (!ses->domainName)
2282 goto get_ses_fail;
2283 }
2284
2285 strscpy(ses->workstation_name, ctx->workstation_name, sizeof(ses->workstation_name));
2286
2287 if (ctx->domainauto)
2288 ses->domainAuto = ctx->domainauto;
2289 ses->cred_uid = ctx->cred_uid;
2290 ses->linux_uid = ctx->linux_uid;
2291
2292 ses->sectype = ctx->sectype;
2293 ses->sign = ctx->sign;
2294 ses->local_nls = load_nls(ctx->local_nls->charset);
2295
2296 /* add server as first channel */
2297 spin_lock(&ses->chan_lock);
2298 ses->chans[0].server = server;
2299 ses->chan_count = 1;
2300 ses->chan_max = ctx->multichannel ? ctx->max_channels:1;
2301 ses->chans_need_reconnect = 1;
2302 spin_unlock(&ses->chan_lock);
2303
2304 mutex_lock(&ses->session_mutex);
2305 rc = cifs_negotiate_protocol(xid, ses, server);
2306 if (!rc)
2307 rc = cifs_setup_session(xid, ses, server, ctx->local_nls);
2308 mutex_unlock(&ses->session_mutex);
2309
2310 /* each channel uses a different signing key */
2311 spin_lock(&ses->chan_lock);
2312 memcpy(ses->chans[0].signkey, ses->smb3signingkey,
2313 sizeof(ses->smb3signingkey));
2314 spin_unlock(&ses->chan_lock);
2315
2316 if (rc)
2317 goto get_ses_fail;
2318
2319 /*
2320 * success, put it on the list and add it as first channel
2321 * note: the session becomes active soon after this. So you'll
2322 * need to lock before changing something in the session.
2323 */
2324 spin_lock(&cifs_tcp_ses_lock);
2325 ses->dfs_root_ses = ctx->dfs_root_ses;
2326 if (ses->dfs_root_ses)
2327 ses->dfs_root_ses->ses_count++;
2328 list_add(&ses->smb_ses_list, &server->smb_ses_list);
2329 spin_unlock(&cifs_tcp_ses_lock);
2330
2331 cifs_setup_ipc(ses, ctx);
2332
2333 free_xid(xid);
2334
2335 return ses;
2336
2337 get_ses_fail:
2338 sesInfoFree(ses);
2339 free_xid(xid);
2340 return ERR_PTR(rc);
2341 }
2342
2343 /* this function must be called with tc_lock held */
2344 static int match_tcon(struct cifs_tcon *tcon, struct smb3_fs_context *ctx)
2345 {
2346 struct TCP_Server_Info *server = tcon->ses->server;
2347
2348 if (tcon->status == TID_EXITING)
2349 return 0;
2350
2351 if (tcon->origin_fullpath) {
2352 if (!ctx->source ||
2353 !dfs_src_pathname_equal(ctx->source,
2354 tcon->origin_fullpath))
2355 return 0;
2356 } else if (!server->leaf_fullpath &&
2357 strncmp(tcon->tree_name, ctx->UNC, MAX_TREE_SIZE)) {
2358 return 0;
2359 }
2360 if (tcon->seal != ctx->seal)
2361 return 0;
2362 if (tcon->snapshot_time != ctx->snapshot_time)
2363 return 0;
2364 if (tcon->handle_timeout != ctx->handle_timeout)
2365 return 0;
2366 if (tcon->no_lease != ctx->no_lease)
2367 return 0;
2368 if (tcon->nodelete != ctx->nodelete)
2369 return 0;
2370 return 1;
2371 }
2372
2373 static struct cifs_tcon *
2374 cifs_find_tcon(struct cifs_ses *ses, struct smb3_fs_context *ctx)
2375 {
2376 struct cifs_tcon *tcon;
2377
2378 spin_lock(&cifs_tcp_ses_lock);
2379 list_for_each_entry(tcon, &ses->tcon_list, tcon_list) {
2380 spin_lock(&tcon->tc_lock);
2381 if (!match_tcon(tcon, ctx)) {
2382 spin_unlock(&tcon->tc_lock);
2383 continue;
2384 }
2385 ++tcon->tc_count;
2386 spin_unlock(&tcon->tc_lock);
2387 spin_unlock(&cifs_tcp_ses_lock);
2388 return tcon;
2389 }
2390 spin_unlock(&cifs_tcp_ses_lock);
2391 return NULL;
2392 }
2393
2394 void
2395 cifs_put_tcon(struct cifs_tcon *tcon)
2396 {
2397 unsigned int xid;
2398 struct cifs_ses *ses;
2399
2400 /*
2401 * IPC tcon share the lifetime of their session and are
2402 * destroyed in the session put function
2403 */
2404 if (tcon == NULL || tcon->ipc)
2405 return;
2406
2407 ses = tcon->ses;
2408 cifs_dbg(FYI, "%s: tc_count=%d\n", __func__, tcon->tc_count);
2409 spin_lock(&cifs_tcp_ses_lock);
2410 spin_lock(&tcon->tc_lock);
2411 if (--tcon->tc_count > 0) {
2412 spin_unlock(&tcon->tc_lock);
2413 spin_unlock(&cifs_tcp_ses_lock);
2414 return;
2415 }
2416
2417 /* tc_count can never go negative */
2418 WARN_ON(tcon->tc_count < 0);
2419
2420 list_del_init(&tcon->tcon_list);
2421 tcon->status = TID_EXITING;
2422 spin_unlock(&tcon->tc_lock);
2423 spin_unlock(&cifs_tcp_ses_lock);
2424
2425 /* cancel polling of interfaces */
2426 cancel_delayed_work_sync(&tcon->query_interfaces);
2427 #ifdef CONFIG_CIFS_DFS_UPCALL
2428 cancel_delayed_work_sync(&tcon->dfs_cache_work);
2429 #endif
2430
2431 if (tcon->use_witness) {
2432 int rc;
2433
2434 rc = cifs_swn_unregister(tcon);
2435 if (rc < 0) {
2436 cifs_dbg(VFS, "%s: Failed to unregister for witness notifications: %d\n",
2437 __func__, rc);
2438 }
2439 }
2440
2441 xid = get_xid();
2442 if (ses->server->ops->tree_disconnect)
2443 ses->server->ops->tree_disconnect(xid, tcon);
2444 _free_xid(xid);
2445
2446 cifs_fscache_release_super_cookie(tcon);
2447 tconInfoFree(tcon);
2448 cifs_put_smb_ses(ses);
2449 }
2450
2451 /**
2452 * cifs_get_tcon - get a tcon matching @ctx data from @ses
2453 * @ses: smb session to issue the request on
2454 * @ctx: the superblock configuration context to use for building the
2455 *
2456 * - tcon refcount is the number of mount points using the tcon.
2457 * - ses refcount is the number of tcon using the session.
2458 *
2459 * 1. This function assumes it is being called from cifs_mount() where
2460 * we already got a session reference (ses refcount +1).
2461 *
2462 * 2. Since we're in the context of adding a mount point, the end
2463 * result should be either:
2464 *
2465 * a) a new tcon already allocated with refcount=1 (1 mount point) and
2466 * its session refcount incremented (1 new tcon). This +1 was
2467 * already done in (1).
2468 *
2469 * b) an existing tcon with refcount+1 (add a mount point to it) and
2470 * identical ses refcount (no new tcon). Because of (1) we need to
2471 * decrement the ses refcount.
2472 */
2473 static struct cifs_tcon *
2474 cifs_get_tcon(struct cifs_ses *ses, struct smb3_fs_context *ctx)
2475 {
2476 int rc, xid;
2477 struct cifs_tcon *tcon;
2478
2479 tcon = cifs_find_tcon(ses, ctx);
2480 if (tcon) {
2481 /*
2482 * tcon has refcount already incremented but we need to
2483 * decrement extra ses reference gotten by caller (case b)
2484 */
2485 cifs_dbg(FYI, "Found match on UNC path\n");
2486 cifs_put_smb_ses(ses);
2487 return tcon;
2488 }
2489
2490 if (!ses->server->ops->tree_connect) {
2491 rc = -ENOSYS;
2492 goto out_fail;
2493 }
2494
2495 tcon = tconInfoAlloc();
2496 if (tcon == NULL) {
2497 rc = -ENOMEM;
2498 goto out_fail;
2499 }
2500
2501 if (ctx->snapshot_time) {
2502 if (ses->server->vals->protocol_id == 0) {
2503 cifs_dbg(VFS,
2504 "Use SMB2 or later for snapshot mount option\n");
2505 rc = -EOPNOTSUPP;
2506 goto out_fail;
2507 } else
2508 tcon->snapshot_time = ctx->snapshot_time;
2509 }
2510
2511 if (ctx->handle_timeout) {
2512 if (ses->server->vals->protocol_id == 0) {
2513 cifs_dbg(VFS,
2514 "Use SMB2.1 or later for handle timeout option\n");
2515 rc = -EOPNOTSUPP;
2516 goto out_fail;
2517 } else
2518 tcon->handle_timeout = ctx->handle_timeout;
2519 }
2520
2521 tcon->ses = ses;
2522 if (ctx->password) {
2523 tcon->password = kstrdup(ctx->password, GFP_KERNEL);
2524 if (!tcon->password) {
2525 rc = -ENOMEM;
2526 goto out_fail;
2527 }
2528 }
2529
2530 if (ctx->seal) {
2531 if (ses->server->vals->protocol_id == 0) {
2532 cifs_dbg(VFS,
2533 "SMB3 or later required for encryption\n");
2534 rc = -EOPNOTSUPP;
2535 goto out_fail;
2536 } else if (tcon->ses->server->capabilities &
2537 SMB2_GLOBAL_CAP_ENCRYPTION)
2538 tcon->seal = true;
2539 else {
2540 cifs_dbg(VFS, "Encryption is not supported on share\n");
2541 rc = -EOPNOTSUPP;
2542 goto out_fail;
2543 }
2544 }
2545
2546 if (ctx->linux_ext) {
2547 if (ses->server->posix_ext_supported) {
2548 tcon->posix_extensions = true;
2549 pr_warn_once("SMB3.11 POSIX Extensions are experimental\n");
2550 } else if ((ses->server->vals->protocol_id == SMB311_PROT_ID) ||
2551 (strcmp(ses->server->vals->version_string,
2552 SMB3ANY_VERSION_STRING) == 0) ||
2553 (strcmp(ses->server->vals->version_string,
2554 SMBDEFAULT_VERSION_STRING) == 0)) {
2555 cifs_dbg(VFS, "Server does not support mounting with posix SMB3.11 extensions\n");
2556 rc = -EOPNOTSUPP;
2557 goto out_fail;
2558 } else {
2559 cifs_dbg(VFS, "Check vers= mount option. SMB3.11 "
2560 "disabled but required for POSIX extensions\n");
2561 rc = -EOPNOTSUPP;
2562 goto out_fail;
2563 }
2564 }
2565
2566 xid = get_xid();
2567 rc = ses->server->ops->tree_connect(xid, ses, ctx->UNC, tcon,
2568 ctx->local_nls);
2569 free_xid(xid);
2570 cifs_dbg(FYI, "Tcon rc = %d\n", rc);
2571 if (rc)
2572 goto out_fail;
2573
2574 tcon->use_persistent = false;
2575 /* check if SMB2 or later, CIFS does not support persistent handles */
2576 if (ctx->persistent) {
2577 if (ses->server->vals->protocol_id == 0) {
2578 cifs_dbg(VFS,
2579 "SMB3 or later required for persistent handles\n");
2580 rc = -EOPNOTSUPP;
2581 goto out_fail;
2582 } else if (ses->server->capabilities &
2583 SMB2_GLOBAL_CAP_PERSISTENT_HANDLES)
2584 tcon->use_persistent = true;
2585 else /* persistent handles requested but not supported */ {
2586 cifs_dbg(VFS,
2587 "Persistent handles not supported on share\n");
2588 rc = -EOPNOTSUPP;
2589 goto out_fail;
2590 }
2591 } else if ((tcon->capabilities & SMB2_SHARE_CAP_CONTINUOUS_AVAILABILITY)
2592 && (ses->server->capabilities & SMB2_GLOBAL_CAP_PERSISTENT_HANDLES)
2593 && (ctx->nopersistent == false)) {
2594 cifs_dbg(FYI, "enabling persistent handles\n");
2595 tcon->use_persistent = true;
2596 } else if (ctx->resilient) {
2597 if (ses->server->vals->protocol_id == 0) {
2598 cifs_dbg(VFS,
2599 "SMB2.1 or later required for resilient handles\n");
2600 rc = -EOPNOTSUPP;
2601 goto out_fail;
2602 }
2603 tcon->use_resilient = true;
2604 }
2605
2606 tcon->use_witness = false;
2607 if (IS_ENABLED(CONFIG_CIFS_SWN_UPCALL) && ctx->witness) {
2608 if (ses->server->vals->protocol_id >= SMB30_PROT_ID) {
2609 if (tcon->capabilities & SMB2_SHARE_CAP_CLUSTER) {
2610 /*
2611 * Set witness in use flag in first place
2612 * to retry registration in the echo task
2613 */
2614 tcon->use_witness = true;
2615 /* And try to register immediately */
2616 rc = cifs_swn_register(tcon);
2617 if (rc < 0) {
2618 cifs_dbg(VFS, "Failed to register for witness notifications: %d\n", rc);
2619 goto out_fail;
2620 }
2621 } else {
2622 /* TODO: try to extend for non-cluster uses (eg multichannel) */
2623 cifs_dbg(VFS, "witness requested on mount but no CLUSTER capability on share\n");
2624 rc = -EOPNOTSUPP;
2625 goto out_fail;
2626 }
2627 } else {
2628 cifs_dbg(VFS, "SMB3 or later required for witness option\n");
2629 rc = -EOPNOTSUPP;
2630 goto out_fail;
2631 }
2632 }
2633
2634 /* If the user really knows what they are doing they can override */
2635 if (tcon->share_flags & SMB2_SHAREFLAG_NO_CACHING) {
2636 if (ctx->cache_ro)
2637 cifs_dbg(VFS, "cache=ro requested on mount but NO_CACHING flag set on share\n");
2638 else if (ctx->cache_rw)
2639 cifs_dbg(VFS, "cache=singleclient requested on mount but NO_CACHING flag set on share\n");
2640 }
2641
2642 if (ctx->no_lease) {
2643 if (ses->server->vals->protocol_id == 0) {
2644 cifs_dbg(VFS,
2645 "SMB2 or later required for nolease option\n");
2646 rc = -EOPNOTSUPP;
2647 goto out_fail;
2648 } else
2649 tcon->no_lease = ctx->no_lease;
2650 }
2651
2652 /*
2653 * We can have only one retry value for a connection to a share so for
2654 * resources mounted more than once to the same server share the last
2655 * value passed in for the retry flag is used.
2656 */
2657 tcon->retry = ctx->retry;
2658 tcon->nocase = ctx->nocase;
2659 tcon->broken_sparse_sup = ctx->no_sparse;
2660 tcon->max_cached_dirs = ctx->max_cached_dirs;
2661 if (ses->server->capabilities & SMB2_GLOBAL_CAP_DIRECTORY_LEASING)
2662 tcon->nohandlecache = ctx->nohandlecache;
2663 else
2664 tcon->nohandlecache = true;
2665 tcon->nodelete = ctx->nodelete;
2666 tcon->local_lease = ctx->local_lease;
2667 INIT_LIST_HEAD(&tcon->pending_opens);
2668 tcon->status = TID_GOOD;
2669
2670 INIT_DELAYED_WORK(&tcon->query_interfaces,
2671 smb2_query_server_interfaces);
2672 if (ses->server->dialect >= SMB30_PROT_ID &&
2673 (ses->server->capabilities & SMB2_GLOBAL_CAP_MULTI_CHANNEL)) {
2674 /* schedule query interfaces poll */
2675 queue_delayed_work(cifsiod_wq, &tcon->query_interfaces,
2676 (SMB_INTERFACE_POLL_INTERVAL * HZ));
2677 }
2678 #ifdef CONFIG_CIFS_DFS_UPCALL
2679 INIT_DELAYED_WORK(&tcon->dfs_cache_work, dfs_cache_refresh);
2680 #endif
2681 spin_lock(&cifs_tcp_ses_lock);
2682 list_add(&tcon->tcon_list, &ses->tcon_list);
2683 spin_unlock(&cifs_tcp_ses_lock);
2684
2685 return tcon;
2686
2687 out_fail:
2688 tconInfoFree(tcon);
2689 return ERR_PTR(rc);
2690 }
2691
2692 void
2693 cifs_put_tlink(struct tcon_link *tlink)
2694 {
2695 if (!tlink || IS_ERR(tlink))
2696 return;
2697
2698 if (!atomic_dec_and_test(&tlink->tl_count) ||
2699 test_bit(TCON_LINK_IN_TREE, &tlink->tl_flags)) {
2700 tlink->tl_time = jiffies;
2701 return;
2702 }
2703
2704 if (!IS_ERR(tlink_tcon(tlink)))
2705 cifs_put_tcon(tlink_tcon(tlink));
2706 kfree(tlink);
2707 return;
2708 }
2709
2710 static int
2711 compare_mount_options(struct super_block *sb, struct cifs_mnt_data *mnt_data)
2712 {
2713 struct cifs_sb_info *old = CIFS_SB(sb);
2714 struct cifs_sb_info *new = mnt_data->cifs_sb;
2715 unsigned int oldflags = old->mnt_cifs_flags & CIFS_MOUNT_MASK;
2716 unsigned int newflags = new->mnt_cifs_flags & CIFS_MOUNT_MASK;
2717
2718 if ((sb->s_flags & CIFS_MS_MASK) != (mnt_data->flags & CIFS_MS_MASK))
2719 return 0;
2720
2721 if (old->mnt_cifs_serverino_autodisabled)
2722 newflags &= ~CIFS_MOUNT_SERVER_INUM;
2723
2724 if (oldflags != newflags)
2725 return 0;
2726
2727 /*
2728 * We want to share sb only if we don't specify an r/wsize or
2729 * specified r/wsize is greater than or equal to existing one.
2730 */
2731 if (new->ctx->wsize && new->ctx->wsize < old->ctx->wsize)
2732 return 0;
2733
2734 if (new->ctx->rsize && new->ctx->rsize < old->ctx->rsize)
2735 return 0;
2736
2737 if (!uid_eq(old->ctx->linux_uid, new->ctx->linux_uid) ||
2738 !gid_eq(old->ctx->linux_gid, new->ctx->linux_gid))
2739 return 0;
2740
2741 if (old->ctx->file_mode != new->ctx->file_mode ||
2742 old->ctx->dir_mode != new->ctx->dir_mode)
2743 return 0;
2744
2745 if (strcmp(old->local_nls->charset, new->local_nls->charset))
2746 return 0;
2747
2748 if (old->ctx->acregmax != new->ctx->acregmax)
2749 return 0;
2750 if (old->ctx->acdirmax != new->ctx->acdirmax)
2751 return 0;
2752 if (old->ctx->closetimeo != new->ctx->closetimeo)
2753 return 0;
2754
2755 return 1;
2756 }
2757
2758 static int match_prepath(struct super_block *sb,
2759 struct cifs_tcon *tcon,
2760 struct cifs_mnt_data *mnt_data)
2761 {
2762 struct smb3_fs_context *ctx = mnt_data->ctx;
2763 struct cifs_sb_info *old = CIFS_SB(sb);
2764 struct cifs_sb_info *new = mnt_data->cifs_sb;
2765 bool old_set = (old->mnt_cifs_flags & CIFS_MOUNT_USE_PREFIX_PATH) &&
2766 old->prepath;
2767 bool new_set = (new->mnt_cifs_flags & CIFS_MOUNT_USE_PREFIX_PATH) &&
2768 new->prepath;
2769
2770 if (tcon->origin_fullpath &&
2771 dfs_src_pathname_equal(tcon->origin_fullpath, ctx->source))
2772 return 1;
2773
2774 if (old_set && new_set && !strcmp(new->prepath, old->prepath))
2775 return 1;
2776 else if (!old_set && !new_set)
2777 return 1;
2778
2779 return 0;
2780 }
2781
2782 int
2783 cifs_match_super(struct super_block *sb, void *data)
2784 {
2785 struct cifs_mnt_data *mnt_data = data;
2786 struct smb3_fs_context *ctx;
2787 struct cifs_sb_info *cifs_sb;
2788 struct TCP_Server_Info *tcp_srv;
2789 struct cifs_ses *ses;
2790 struct cifs_tcon *tcon;
2791 struct tcon_link *tlink;
2792 int rc = 0;
2793
2794 spin_lock(&cifs_tcp_ses_lock);
2795 cifs_sb = CIFS_SB(sb);
2796
2797 /* We do not want to use a superblock that has been shutdown */
2798 if (CIFS_MOUNT_SHUTDOWN & cifs_sb->mnt_cifs_flags) {
2799 spin_unlock(&cifs_tcp_ses_lock);
2800 return 0;
2801 }
2802
2803 tlink = cifs_get_tlink(cifs_sb_master_tlink(cifs_sb));
2804 if (IS_ERR_OR_NULL(tlink)) {
2805 pr_warn_once("%s: skip super matching due to bad tlink(%p)\n",
2806 __func__, tlink);
2807 spin_unlock(&cifs_tcp_ses_lock);
2808 return 0;
2809 }
2810 tcon = tlink_tcon(tlink);
2811 ses = tcon->ses;
2812 tcp_srv = ses->server;
2813
2814 ctx = mnt_data->ctx;
2815
2816 spin_lock(&tcp_srv->srv_lock);
2817 spin_lock(&ses->ses_lock);
2818 spin_lock(&ses->chan_lock);
2819 spin_lock(&tcon->tc_lock);
2820 if (!match_server(tcp_srv, ctx, true) ||
2821 !match_session(ses, ctx) ||
2822 !match_tcon(tcon, ctx) ||
2823 !match_prepath(sb, tcon, mnt_data)) {
2824 rc = 0;
2825 goto out;
2826 }
2827
2828 rc = compare_mount_options(sb, mnt_data);
2829 out:
2830 spin_unlock(&tcon->tc_lock);
2831 spin_unlock(&ses->chan_lock);
2832 spin_unlock(&ses->ses_lock);
2833 spin_unlock(&tcp_srv->srv_lock);
2834
2835 spin_unlock(&cifs_tcp_ses_lock);
2836 cifs_put_tlink(tlink);
2837 return rc;
2838 }
2839
2840 #ifdef CONFIG_DEBUG_LOCK_ALLOC
2841 static struct lock_class_key cifs_key[2];
2842 static struct lock_class_key cifs_slock_key[2];
2843
2844 static inline void
2845 cifs_reclassify_socket4(struct socket *sock)
2846 {
2847 struct sock *sk = sock->sk;
2848 BUG_ON(!sock_allow_reclassification(sk));
2849 sock_lock_init_class_and_name(sk, "slock-AF_INET-CIFS",
2850 &cifs_slock_key[0], "sk_lock-AF_INET-CIFS", &cifs_key[0]);
2851 }
2852
2853 static inline void
2854 cifs_reclassify_socket6(struct socket *sock)
2855 {
2856 struct sock *sk = sock->sk;
2857 BUG_ON(!sock_allow_reclassification(sk));
2858 sock_lock_init_class_and_name(sk, "slock-AF_INET6-CIFS",
2859 &cifs_slock_key[1], "sk_lock-AF_INET6-CIFS", &cifs_key[1]);
2860 }
2861 #else
2862 static inline void
2863 cifs_reclassify_socket4(struct socket *sock)
2864 {
2865 }
2866
2867 static inline void
2868 cifs_reclassify_socket6(struct socket *sock)
2869 {
2870 }
2871 #endif
2872
2873 /* See RFC1001 section 14 on representation of Netbios names */
2874 static void rfc1002mangle(char *target, char *source, unsigned int length)
2875 {
2876 unsigned int i, j;
2877
2878 for (i = 0, j = 0; i < (length); i++) {
2879 /* mask a nibble at a time and encode */
2880 target[j] = 'A' + (0x0F & (source[i] >> 4));
2881 target[j+1] = 'A' + (0x0F & source[i]);
2882 j += 2;
2883 }
2884
2885 }
2886
2887 static int
2888 bind_socket(struct TCP_Server_Info *server)
2889 {
2890 int rc = 0;
2891 if (server->srcaddr.ss_family != AF_UNSPEC) {
2892 /* Bind to the specified local IP address */
2893 struct socket *socket = server->ssocket;
2894 rc = socket->ops->bind(socket,
2895 (struct sockaddr *) &server->srcaddr,
2896 sizeof(server->srcaddr));
2897 if (rc < 0) {
2898 struct sockaddr_in *saddr4;
2899 struct sockaddr_in6 *saddr6;
2900 saddr4 = (struct sockaddr_in *)&server->srcaddr;
2901 saddr6 = (struct sockaddr_in6 *)&server->srcaddr;
2902 if (saddr6->sin6_family == AF_INET6)
2903 cifs_server_dbg(VFS, "Failed to bind to: %pI6c, error: %d\n",
2904 &saddr6->sin6_addr, rc);
2905 else
2906 cifs_server_dbg(VFS, "Failed to bind to: %pI4, error: %d\n",
2907 &saddr4->sin_addr.s_addr, rc);
2908 }
2909 }
2910 return rc;
2911 }
2912
2913 static int
2914 ip_rfc1001_connect(struct TCP_Server_Info *server)
2915 {
2916 int rc = 0;
2917 /*
2918 * some servers require RFC1001 sessinit before sending
2919 * negprot - BB check reconnection in case where second
2920 * sessinit is sent but no second negprot
2921 */
2922 struct rfc1002_session_packet req = {};
2923 struct smb_hdr *smb_buf = (struct smb_hdr *)&req;
2924 unsigned int len;
2925
2926 req.trailer.session_req.called_len = sizeof(req.trailer.session_req.called_name);
2927
2928 if (server->server_RFC1001_name[0] != 0)
2929 rfc1002mangle(req.trailer.session_req.called_name,
2930 server->server_RFC1001_name,
2931 RFC1001_NAME_LEN_WITH_NULL);
2932 else
2933 rfc1002mangle(req.trailer.session_req.called_name,
2934 DEFAULT_CIFS_CALLED_NAME,
2935 RFC1001_NAME_LEN_WITH_NULL);
2936
2937 req.trailer.session_req.calling_len = sizeof(req.trailer.session_req.calling_name);
2938
2939 /* calling name ends in null (byte 16) from old smb convention */
2940 if (server->workstation_RFC1001_name[0] != 0)
2941 rfc1002mangle(req.trailer.session_req.calling_name,
2942 server->workstation_RFC1001_name,
2943 RFC1001_NAME_LEN_WITH_NULL);
2944 else
2945 rfc1002mangle(req.trailer.session_req.calling_name,
2946 "LINUX_CIFS_CLNT",
2947 RFC1001_NAME_LEN_WITH_NULL);
2948
2949 /*
2950 * As per rfc1002, @len must be the number of bytes that follows the
2951 * length field of a rfc1002 session request payload.
2952 */
2953 len = sizeof(req) - offsetof(struct rfc1002_session_packet, trailer.session_req);
2954
2955 smb_buf->smb_buf_length = cpu_to_be32((RFC1002_SESSION_REQUEST << 24) | len);
2956 rc = smb_send(server, smb_buf, len);
2957 /*
2958 * RFC1001 layer in at least one server requires very short break before
2959 * negprot presumably because not expecting negprot to follow so fast.
2960 * This is a simple solution that works without complicating the code
2961 * and causes no significant slowing down on mount for everyone else
2962 */
2963 usleep_range(1000, 2000);
2964
2965 return rc;
2966 }
2967
2968 static int
2969 generic_ip_connect(struct TCP_Server_Info *server)
2970 {
2971 struct sockaddr *saddr;
2972 struct socket *socket;
2973 int slen, sfamily;
2974 __be16 sport;
2975 int rc = 0;
2976
2977 saddr = (struct sockaddr *) &server->dstaddr;
2978
2979 if (server->dstaddr.ss_family == AF_INET6) {
2980 struct sockaddr_in6 *ipv6 = (struct sockaddr_in6 *)&server->dstaddr;
2981
2982 sport = ipv6->sin6_port;
2983 slen = sizeof(struct sockaddr_in6);
2984 sfamily = AF_INET6;
2985 cifs_dbg(FYI, "%s: connecting to [%pI6]:%d\n", __func__, &ipv6->sin6_addr,
2986 ntohs(sport));
2987 } else {
2988 struct sockaddr_in *ipv4 = (struct sockaddr_in *)&server->dstaddr;
2989
2990 sport = ipv4->sin_port;
2991 slen = sizeof(struct sockaddr_in);
2992 sfamily = AF_INET;
2993 cifs_dbg(FYI, "%s: connecting to %pI4:%d\n", __func__, &ipv4->sin_addr,
2994 ntohs(sport));
2995 }
2996
2997 if (server->ssocket) {
2998 socket = server->ssocket;
2999 } else {
3000 rc = __sock_create(cifs_net_ns(server), sfamily, SOCK_STREAM,
3001 IPPROTO_TCP, &server->ssocket, 1);
3002 if (rc < 0) {
3003 cifs_server_dbg(VFS, "Error %d creating socket\n", rc);
3004 return rc;
3005 }
3006
3007 /* BB other socket options to set KEEPALIVE, NODELAY? */
3008 cifs_dbg(FYI, "Socket created\n");
3009 socket = server->ssocket;
3010 socket->sk->sk_allocation = GFP_NOFS;
3011 socket->sk->sk_use_task_frag = false;
3012 if (sfamily == AF_INET6)
3013 cifs_reclassify_socket6(socket);
3014 else
3015 cifs_reclassify_socket4(socket);
3016 }
3017
3018 rc = bind_socket(server);
3019 if (rc < 0)
3020 return rc;
3021
3022 /*
3023 * Eventually check for other socket options to change from
3024 * the default. sock_setsockopt not used because it expects
3025 * user space buffer
3026 */
3027 socket->sk->sk_rcvtimeo = 7 * HZ;
3028 socket->sk->sk_sndtimeo = 5 * HZ;
3029
3030 /* make the bufsizes depend on wsize/rsize and max requests */
3031 if (server->noautotune) {
3032 if (socket->sk->sk_sndbuf < (200 * 1024))
3033 socket->sk->sk_sndbuf = 200 * 1024;
3034 if (socket->sk->sk_rcvbuf < (140 * 1024))
3035 socket->sk->sk_rcvbuf = 140 * 1024;
3036 }
3037
3038 if (server->tcp_nodelay)
3039 tcp_sock_set_nodelay(socket->sk);
3040
3041 cifs_dbg(FYI, "sndbuf %d rcvbuf %d rcvtimeo 0x%lx\n",
3042 socket->sk->sk_sndbuf,
3043 socket->sk->sk_rcvbuf, socket->sk->sk_rcvtimeo);
3044
3045 rc = socket->ops->connect(socket, saddr, slen,
3046 server->noblockcnt ? O_NONBLOCK : 0);
3047 /*
3048 * When mounting SMB root file systems, we do not want to block in
3049 * connect. Otherwise bail out and then let cifs_reconnect() perform
3050 * reconnect failover - if possible.
3051 */
3052 if (server->noblockcnt && rc == -EINPROGRESS)
3053 rc = 0;
3054 if (rc < 0) {
3055 cifs_dbg(FYI, "Error %d connecting to server\n", rc);
3056 trace_smb3_connect_err(server->hostname, server->conn_id, &server->dstaddr, rc);
3057 sock_release(socket);
3058 server->ssocket = NULL;
3059 return rc;
3060 }
3061 trace_smb3_connect_done(server->hostname, server->conn_id, &server->dstaddr);
3062 if (sport == htons(RFC1001_PORT))
3063 rc = ip_rfc1001_connect(server);
3064
3065 return rc;
3066 }
3067
3068 static int
3069 ip_connect(struct TCP_Server_Info *server)
3070 {
3071 __be16 *sport;
3072 struct sockaddr_in6 *addr6 = (struct sockaddr_in6 *)&server->dstaddr;
3073 struct sockaddr_in *addr = (struct sockaddr_in *)&server->dstaddr;
3074
3075 if (server->dstaddr.ss_family == AF_INET6)
3076 sport = &addr6->sin6_port;
3077 else
3078 sport = &addr->sin_port;
3079
3080 if (*sport == 0) {
3081 int rc;
3082
3083 /* try with 445 port at first */
3084 *sport = htons(CIFS_PORT);
3085
3086 rc = generic_ip_connect(server);
3087 if (rc >= 0)
3088 return rc;
3089
3090 /* if it failed, try with 139 port */
3091 *sport = htons(RFC1001_PORT);
3092 }
3093
3094 return generic_ip_connect(server);
3095 }
3096
3097 #ifdef CONFIG_CIFS_ALLOW_INSECURE_LEGACY
3098 void reset_cifs_unix_caps(unsigned int xid, struct cifs_tcon *tcon,
3099 struct cifs_sb_info *cifs_sb, struct smb3_fs_context *ctx)
3100 {
3101 /*
3102 * If we are reconnecting then should we check to see if
3103 * any requested capabilities changed locally e.g. via
3104 * remount but we can not do much about it here
3105 * if they have (even if we could detect it by the following)
3106 * Perhaps we could add a backpointer to array of sb from tcon
3107 * or if we change to make all sb to same share the same
3108 * sb as NFS - then we only have one backpointer to sb.
3109 * What if we wanted to mount the server share twice once with
3110 * and once without posixacls or posix paths?
3111 */
3112 __u64 saved_cap = le64_to_cpu(tcon->fsUnixInfo.Capability);
3113
3114 if (ctx && ctx->no_linux_ext) {
3115 tcon->fsUnixInfo.Capability = 0;
3116 tcon->unix_ext = 0; /* Unix Extensions disabled */
3117 cifs_dbg(FYI, "Linux protocol extensions disabled\n");
3118 return;
3119 } else if (ctx)
3120 tcon->unix_ext = 1; /* Unix Extensions supported */
3121
3122 if (!tcon->unix_ext) {
3123 cifs_dbg(FYI, "Unix extensions disabled so not set on reconnect\n");
3124 return;
3125 }
3126
3127 if (!CIFSSMBQFSUnixInfo(xid, tcon)) {
3128 __u64 cap = le64_to_cpu(tcon->fsUnixInfo.Capability);
3129 cifs_dbg(FYI, "unix caps which server supports %lld\n", cap);
3130 /*
3131 * check for reconnect case in which we do not
3132 * want to change the mount behavior if we can avoid it
3133 */
3134 if (ctx == NULL) {
3135 /*
3136 * turn off POSIX ACL and PATHNAMES if not set
3137 * originally at mount time
3138 */
3139 if ((saved_cap & CIFS_UNIX_POSIX_ACL_CAP) == 0)
3140 cap &= ~CIFS_UNIX_POSIX_ACL_CAP;
3141 if ((saved_cap & CIFS_UNIX_POSIX_PATHNAMES_CAP) == 0) {
3142 if (cap & CIFS_UNIX_POSIX_PATHNAMES_CAP)
3143 cifs_dbg(VFS, "POSIXPATH support change\n");
3144 cap &= ~CIFS_UNIX_POSIX_PATHNAMES_CAP;
3145 } else if ((cap & CIFS_UNIX_POSIX_PATHNAMES_CAP) == 0) {
3146 cifs_dbg(VFS, "possible reconnect error\n");
3147 cifs_dbg(VFS, "server disabled POSIX path support\n");
3148 }
3149 }
3150
3151 if (cap & CIFS_UNIX_TRANSPORT_ENCRYPTION_MANDATORY_CAP)
3152 cifs_dbg(VFS, "per-share encryption not supported yet\n");
3153
3154 cap &= CIFS_UNIX_CAP_MASK;
3155 if (ctx && ctx->no_psx_acl)
3156 cap &= ~CIFS_UNIX_POSIX_ACL_CAP;
3157 else if (CIFS_UNIX_POSIX_ACL_CAP & cap) {
3158 cifs_dbg(FYI, "negotiated posix acl support\n");
3159 if (cifs_sb)
3160 cifs_sb->mnt_cifs_flags |=
3161 CIFS_MOUNT_POSIXACL;
3162 }
3163
3164 if (ctx && ctx->posix_paths == 0)
3165 cap &= ~CIFS_UNIX_POSIX_PATHNAMES_CAP;
3166 else if (cap & CIFS_UNIX_POSIX_PATHNAMES_CAP) {
3167 cifs_dbg(FYI, "negotiate posix pathnames\n");
3168 if (cifs_sb)
3169 cifs_sb->mnt_cifs_flags |=
3170 CIFS_MOUNT_POSIX_PATHS;
3171 }
3172
3173 cifs_dbg(FYI, "Negotiate caps 0x%x\n", (int)cap);
3174 #ifdef CONFIG_CIFS_DEBUG2
3175 if (cap & CIFS_UNIX_FCNTL_CAP)
3176 cifs_dbg(FYI, "FCNTL cap\n");
3177 if (cap & CIFS_UNIX_EXTATTR_CAP)
3178 cifs_dbg(FYI, "EXTATTR cap\n");
3179 if (cap & CIFS_UNIX_POSIX_PATHNAMES_CAP)
3180 cifs_dbg(FYI, "POSIX path cap\n");
3181 if (cap & CIFS_UNIX_XATTR_CAP)
3182 cifs_dbg(FYI, "XATTR cap\n");
3183 if (cap & CIFS_UNIX_POSIX_ACL_CAP)
3184 cifs_dbg(FYI, "POSIX ACL cap\n");
3185 if (cap & CIFS_UNIX_LARGE_READ_CAP)
3186 cifs_dbg(FYI, "very large read cap\n");
3187 if (cap & CIFS_UNIX_LARGE_WRITE_CAP)
3188 cifs_dbg(FYI, "very large write cap\n");
3189 if (cap & CIFS_UNIX_TRANSPORT_ENCRYPTION_CAP)
3190 cifs_dbg(FYI, "transport encryption cap\n");
3191 if (cap & CIFS_UNIX_TRANSPORT_ENCRYPTION_MANDATORY_CAP)
3192 cifs_dbg(FYI, "mandatory transport encryption cap\n");
3193 #endif /* CIFS_DEBUG2 */
3194 if (CIFSSMBSetFSUnixInfo(xid, tcon, cap)) {
3195 if (ctx == NULL)
3196 cifs_dbg(FYI, "resetting capabilities failed\n");
3197 else
3198 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");
3199
3200 }
3201 }
3202 }
3203 #endif /* CONFIG_CIFS_ALLOW_INSECURE_LEGACY */
3204
3205 int cifs_setup_cifs_sb(struct cifs_sb_info *cifs_sb)
3206 {
3207 struct smb3_fs_context *ctx = cifs_sb->ctx;
3208
3209 INIT_DELAYED_WORK(&cifs_sb->prune_tlinks, cifs_prune_tlinks);
3210
3211 spin_lock_init(&cifs_sb->tlink_tree_lock);
3212 cifs_sb->tlink_tree = RB_ROOT;
3213
3214 cifs_dbg(FYI, "file mode: %04ho dir mode: %04ho\n",
3215 ctx->file_mode, ctx->dir_mode);
3216
3217 /* this is needed for ASCII cp to Unicode converts */
3218 if (ctx->iocharset == NULL) {
3219 /* load_nls_default cannot return null */
3220 cifs_sb->local_nls = load_nls_default();
3221 } else {
3222 cifs_sb->local_nls = load_nls(ctx->iocharset);
3223 if (cifs_sb->local_nls == NULL) {
3224 cifs_dbg(VFS, "CIFS mount error: iocharset %s not found\n",
3225 ctx->iocharset);
3226 return -ELIBACC;
3227 }
3228 }
3229 ctx->local_nls = cifs_sb->local_nls;
3230
3231 smb3_update_mnt_flags(cifs_sb);
3232
3233 if (ctx->direct_io)
3234 cifs_dbg(FYI, "mounting share using direct i/o\n");
3235 if (ctx->cache_ro) {
3236 cifs_dbg(VFS, "mounting share with read only caching. Ensure that the share will not be modified while in use.\n");
3237 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_RO_CACHE;
3238 } else if (ctx->cache_rw) {
3239 cifs_dbg(VFS, "mounting share in single client RW caching mode. Ensure that no other systems will be accessing the share.\n");
3240 cifs_sb->mnt_cifs_flags |= (CIFS_MOUNT_RO_CACHE |
3241 CIFS_MOUNT_RW_CACHE);
3242 }
3243
3244 if ((ctx->cifs_acl) && (ctx->dynperm))
3245 cifs_dbg(VFS, "mount option dynperm ignored if cifsacl mount option supported\n");
3246
3247 if (ctx->prepath) {
3248 cifs_sb->prepath = kstrdup(ctx->prepath, GFP_KERNEL);
3249 if (cifs_sb->prepath == NULL)
3250 return -ENOMEM;
3251 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_USE_PREFIX_PATH;
3252 }
3253
3254 return 0;
3255 }
3256
3257 /* Release all succeed connections */
3258 void cifs_mount_put_conns(struct cifs_mount_ctx *mnt_ctx)
3259 {
3260 int rc = 0;
3261
3262 if (mnt_ctx->tcon)
3263 cifs_put_tcon(mnt_ctx->tcon);
3264 else if (mnt_ctx->ses)
3265 cifs_put_smb_ses(mnt_ctx->ses);
3266 else if (mnt_ctx->server)
3267 cifs_put_tcp_session(mnt_ctx->server, 0);
3268 mnt_ctx->cifs_sb->mnt_cifs_flags &= ~CIFS_MOUNT_POSIX_PATHS;
3269 free_xid(mnt_ctx->xid);
3270 }
3271
3272 int cifs_mount_get_session(struct cifs_mount_ctx *mnt_ctx)
3273 {
3274 struct TCP_Server_Info *server = NULL;
3275 struct smb3_fs_context *ctx;
3276 struct cifs_ses *ses = NULL;
3277 unsigned int xid;
3278 int rc = 0;
3279
3280 xid = get_xid();
3281
3282 if (WARN_ON_ONCE(!mnt_ctx || !mnt_ctx->fs_ctx)) {
3283 rc = -EINVAL;
3284 goto out;
3285 }
3286 ctx = mnt_ctx->fs_ctx;
3287
3288 /* get a reference to a tcp session */
3289 server = cifs_get_tcp_session(ctx, NULL);
3290 if (IS_ERR(server)) {
3291 rc = PTR_ERR(server);
3292 server = NULL;
3293 goto out;
3294 }
3295
3296 /* get a reference to a SMB session */
3297 ses = cifs_get_smb_ses(server, ctx);
3298 if (IS_ERR(ses)) {
3299 rc = PTR_ERR(ses);
3300 ses = NULL;
3301 goto out;
3302 }
3303
3304 if ((ctx->persistent == true) && (!(ses->server->capabilities &
3305 SMB2_GLOBAL_CAP_PERSISTENT_HANDLES))) {
3306 cifs_server_dbg(VFS, "persistent handles not supported by server\n");
3307 rc = -EOPNOTSUPP;
3308 }
3309
3310 out:
3311 mnt_ctx->xid = xid;
3312 mnt_ctx->server = server;
3313 mnt_ctx->ses = ses;
3314 mnt_ctx->tcon = NULL;
3315
3316 return rc;
3317 }
3318
3319 int cifs_mount_get_tcon(struct cifs_mount_ctx *mnt_ctx)
3320 {
3321 struct TCP_Server_Info *server;
3322 struct cifs_sb_info *cifs_sb;
3323 struct smb3_fs_context *ctx;
3324 struct cifs_tcon *tcon = NULL;
3325 int rc = 0;
3326
3327 if (WARN_ON_ONCE(!mnt_ctx || !mnt_ctx->server || !mnt_ctx->ses || !mnt_ctx->fs_ctx ||
3328 !mnt_ctx->cifs_sb)) {
3329 rc = -EINVAL;
3330 goto out;
3331 }
3332 server = mnt_ctx->server;
3333 ctx = mnt_ctx->fs_ctx;
3334 cifs_sb = mnt_ctx->cifs_sb;
3335
3336 /* search for existing tcon to this server share */
3337 tcon = cifs_get_tcon(mnt_ctx->ses, ctx);
3338 if (IS_ERR(tcon)) {
3339 rc = PTR_ERR(tcon);
3340 tcon = NULL;
3341 goto out;
3342 }
3343
3344 /* if new SMB3.11 POSIX extensions are supported do not remap / and \ */
3345 if (tcon->posix_extensions)
3346 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_POSIX_PATHS;
3347
3348 #ifdef CONFIG_CIFS_ALLOW_INSECURE_LEGACY
3349 /* tell server which Unix caps we support */
3350 if (cap_unix(tcon->ses)) {
3351 /*
3352 * reset of caps checks mount to see if unix extensions disabled
3353 * for just this mount.
3354 */
3355 reset_cifs_unix_caps(mnt_ctx->xid, tcon, cifs_sb, ctx);
3356 spin_lock(&tcon->ses->server->srv_lock);
3357 if ((tcon->ses->server->tcpStatus == CifsNeedReconnect) &&
3358 (le64_to_cpu(tcon->fsUnixInfo.Capability) &
3359 CIFS_UNIX_TRANSPORT_ENCRYPTION_MANDATORY_CAP)) {
3360 spin_unlock(&tcon->ses->server->srv_lock);
3361 rc = -EACCES;
3362 goto out;
3363 }
3364 spin_unlock(&tcon->ses->server->srv_lock);
3365 } else
3366 #endif /* CONFIG_CIFS_ALLOW_INSECURE_LEGACY */
3367 tcon->unix_ext = 0; /* server does not support them */
3368
3369 /* do not care if a following call succeed - informational */
3370 if (!tcon->pipe && server->ops->qfs_tcon) {
3371 server->ops->qfs_tcon(mnt_ctx->xid, tcon, cifs_sb);
3372 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_RO_CACHE) {
3373 if (tcon->fsDevInfo.DeviceCharacteristics &
3374 cpu_to_le32(FILE_READ_ONLY_DEVICE))
3375 cifs_dbg(VFS, "mounted to read only share\n");
3376 else if ((cifs_sb->mnt_cifs_flags &
3377 CIFS_MOUNT_RW_CACHE) == 0)
3378 cifs_dbg(VFS, "read only mount of RW share\n");
3379 /* no need to log a RW mount of a typical RW share */
3380 }
3381 }
3382
3383 /*
3384 * Clamp the rsize/wsize mount arguments if they are too big for the server
3385 * and set the rsize/wsize to the negotiated values if not passed in by
3386 * the user on mount
3387 */
3388 if ((cifs_sb->ctx->wsize == 0) ||
3389 (cifs_sb->ctx->wsize > server->ops->negotiate_wsize(tcon, ctx)))
3390 cifs_sb->ctx->wsize = server->ops->negotiate_wsize(tcon, ctx);
3391 if ((cifs_sb->ctx->rsize == 0) ||
3392 (cifs_sb->ctx->rsize > server->ops->negotiate_rsize(tcon, ctx)))
3393 cifs_sb->ctx->rsize = server->ops->negotiate_rsize(tcon, ctx);
3394
3395 /*
3396 * The cookie is initialized from volume info returned above.
3397 * Inside cifs_fscache_get_super_cookie it checks
3398 * that we do not get super cookie twice.
3399 */
3400 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_FSCACHE)
3401 cifs_fscache_get_super_cookie(tcon);
3402
3403 out:
3404 mnt_ctx->tcon = tcon;
3405 return rc;
3406 }
3407
3408 static int mount_setup_tlink(struct cifs_sb_info *cifs_sb, struct cifs_ses *ses,
3409 struct cifs_tcon *tcon)
3410 {
3411 struct tcon_link *tlink;
3412
3413 /* hang the tcon off of the superblock */
3414 tlink = kzalloc(sizeof(*tlink), GFP_KERNEL);
3415 if (tlink == NULL)
3416 return -ENOMEM;
3417
3418 tlink->tl_uid = ses->linux_uid;
3419 tlink->tl_tcon = tcon;
3420 tlink->tl_time = jiffies;
3421 set_bit(TCON_LINK_MASTER, &tlink->tl_flags);
3422 set_bit(TCON_LINK_IN_TREE, &tlink->tl_flags);
3423
3424 cifs_sb->master_tlink = tlink;
3425 spin_lock(&cifs_sb->tlink_tree_lock);
3426 tlink_rb_insert(&cifs_sb->tlink_tree, tlink);
3427 spin_unlock(&cifs_sb->tlink_tree_lock);
3428
3429 queue_delayed_work(cifsiod_wq, &cifs_sb->prune_tlinks,
3430 TLINK_IDLE_EXPIRE);
3431 return 0;
3432 }
3433
3434 static int
3435 cifs_are_all_path_components_accessible(struct TCP_Server_Info *server,
3436 unsigned int xid,
3437 struct cifs_tcon *tcon,
3438 struct cifs_sb_info *cifs_sb,
3439 char *full_path,
3440 int added_treename)
3441 {
3442 int rc;
3443 char *s;
3444 char sep, tmp;
3445 int skip = added_treename ? 1 : 0;
3446
3447 sep = CIFS_DIR_SEP(cifs_sb);
3448 s = full_path;
3449
3450 rc = server->ops->is_path_accessible(xid, tcon, cifs_sb, "");
3451 while (rc == 0) {
3452 /* skip separators */
3453 while (*s == sep)
3454 s++;
3455 if (!*s)
3456 break;
3457 /* next separator */
3458 while (*s && *s != sep)
3459 s++;
3460 /*
3461 * if the treename is added, we then have to skip the first
3462 * part within the separators
3463 */
3464 if (skip) {
3465 skip = 0;
3466 continue;
3467 }
3468 /*
3469 * temporarily null-terminate the path at the end of
3470 * the current component
3471 */
3472 tmp = *s;
3473 *s = 0;
3474 rc = server->ops->is_path_accessible(xid, tcon, cifs_sb,
3475 full_path);
3476 *s = tmp;
3477 }
3478 return rc;
3479 }
3480
3481 /*
3482 * Check if path is remote (i.e. a DFS share).
3483 *
3484 * Return -EREMOTE if it is, otherwise 0 or -errno.
3485 */
3486 int cifs_is_path_remote(struct cifs_mount_ctx *mnt_ctx)
3487 {
3488 int rc;
3489 struct cifs_sb_info *cifs_sb = mnt_ctx->cifs_sb;
3490 struct TCP_Server_Info *server = mnt_ctx->server;
3491 unsigned int xid = mnt_ctx->xid;
3492 struct cifs_tcon *tcon = mnt_ctx->tcon;
3493 struct smb3_fs_context *ctx = mnt_ctx->fs_ctx;
3494 char *full_path;
3495
3496 if (!server->ops->is_path_accessible)
3497 return -EOPNOTSUPP;
3498
3499 /*
3500 * cifs_build_path_to_root works only when we have a valid tcon
3501 */
3502 full_path = cifs_build_path_to_root(ctx, cifs_sb, tcon,
3503 tcon->Flags & SMB_SHARE_IS_IN_DFS);
3504 if (full_path == NULL)
3505 return -ENOMEM;
3506
3507 cifs_dbg(FYI, "%s: full_path: %s\n", __func__, full_path);
3508
3509 rc = server->ops->is_path_accessible(xid, tcon, cifs_sb,
3510 full_path);
3511 if (rc != 0 && rc != -EREMOTE)
3512 goto out;
3513
3514 if (rc != -EREMOTE) {
3515 rc = cifs_are_all_path_components_accessible(server, xid, tcon,
3516 cifs_sb, full_path, tcon->Flags & SMB_SHARE_IS_IN_DFS);
3517 if (rc != 0) {
3518 cifs_server_dbg(VFS, "cannot query dirs between root and final path, enabling CIFS_MOUNT_USE_PREFIX_PATH\n");
3519 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_USE_PREFIX_PATH;
3520 rc = 0;
3521 }
3522 }
3523
3524 out:
3525 kfree(full_path);
3526 return rc;
3527 }
3528
3529 #ifdef CONFIG_CIFS_DFS_UPCALL
3530 int cifs_mount(struct cifs_sb_info *cifs_sb, struct smb3_fs_context *ctx)
3531 {
3532 struct cifs_mount_ctx mnt_ctx = { .cifs_sb = cifs_sb, .fs_ctx = ctx, };
3533 bool isdfs;
3534 int rc;
3535
3536 INIT_LIST_HEAD(&mnt_ctx.dfs_ses_list);
3537
3538 rc = dfs_mount_share(&mnt_ctx, &isdfs);
3539 if (rc)
3540 goto error;
3541 if (!isdfs)
3542 goto out;
3543
3544 /*
3545 * After reconnecting to a different server, unique ids won't match anymore, so we disable
3546 * serverino. This prevents dentry revalidation to think the dentry are stale (ESTALE).
3547 */
3548 cifs_autodisable_serverino(cifs_sb);
3549 /*
3550 * Force the use of prefix path to support failover on DFS paths that resolve to targets
3551 * that have different prefix paths.
3552 */
3553 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_USE_PREFIX_PATH;
3554 kfree(cifs_sb->prepath);
3555 cifs_sb->prepath = ctx->prepath;
3556 ctx->prepath = NULL;
3557
3558 out:
3559 cifs_try_adding_channels(cifs_sb, mnt_ctx.ses);
3560 rc = mount_setup_tlink(cifs_sb, mnt_ctx.ses, mnt_ctx.tcon);
3561 if (rc)
3562 goto error;
3563
3564 free_xid(mnt_ctx.xid);
3565 return rc;
3566
3567 error:
3568 dfs_put_root_smb_sessions(&mnt_ctx.dfs_ses_list);
3569 cifs_mount_put_conns(&mnt_ctx);
3570 return rc;
3571 }
3572 #else
3573 int cifs_mount(struct cifs_sb_info *cifs_sb, struct smb3_fs_context *ctx)
3574 {
3575 int rc = 0;
3576 struct cifs_mount_ctx mnt_ctx = { .cifs_sb = cifs_sb, .fs_ctx = ctx, };
3577
3578 rc = cifs_mount_get_session(&mnt_ctx);
3579 if (rc)
3580 goto error;
3581
3582 rc = cifs_mount_get_tcon(&mnt_ctx);
3583 if (rc)
3584 goto error;
3585
3586 rc = cifs_is_path_remote(&mnt_ctx);
3587 if (rc == -EREMOTE)
3588 rc = -EOPNOTSUPP;
3589 if (rc)
3590 goto error;
3591
3592 rc = mount_setup_tlink(cifs_sb, mnt_ctx.ses, mnt_ctx.tcon);
3593 if (rc)
3594 goto error;
3595
3596 free_xid(mnt_ctx.xid);
3597 return rc;
3598
3599 error:
3600 cifs_mount_put_conns(&mnt_ctx);
3601 return rc;
3602 }
3603 #endif
3604
3605 /*
3606 * Issue a TREE_CONNECT request.
3607 */
3608 int
3609 CIFSTCon(const unsigned int xid, struct cifs_ses *ses,
3610 const char *tree, struct cifs_tcon *tcon,
3611 const struct nls_table *nls_codepage)
3612 {
3613 struct smb_hdr *smb_buffer;
3614 struct smb_hdr *smb_buffer_response;
3615 TCONX_REQ *pSMB;
3616 TCONX_RSP *pSMBr;
3617 unsigned char *bcc_ptr;
3618 int rc = 0;
3619 int length;
3620 __u16 bytes_left, count;
3621
3622 if (ses == NULL)
3623 return -EIO;
3624
3625 smb_buffer = cifs_buf_get();
3626 if (smb_buffer == NULL)
3627 return -ENOMEM;
3628
3629 smb_buffer_response = smb_buffer;
3630
3631 header_assemble(smb_buffer, SMB_COM_TREE_CONNECT_ANDX,
3632 NULL /*no tid */ , 4 /*wct */ );
3633
3634 smb_buffer->Mid = get_next_mid(ses->server);
3635 smb_buffer->Uid = ses->Suid;
3636 pSMB = (TCONX_REQ *) smb_buffer;
3637 pSMBr = (TCONX_RSP *) smb_buffer_response;
3638
3639 pSMB->AndXCommand = 0xFF;
3640 pSMB->Flags = cpu_to_le16(TCON_EXTENDED_SECINFO);
3641 bcc_ptr = &pSMB->Password[0];
3642
3643 pSMB->PasswordLength = cpu_to_le16(1); /* minimum */
3644 *bcc_ptr = 0; /* password is null byte */
3645 bcc_ptr++; /* skip password */
3646 /* already aligned so no need to do it below */
3647
3648 if (ses->server->sign)
3649 smb_buffer->Flags2 |= SMBFLG2_SECURITY_SIGNATURE;
3650
3651 if (ses->capabilities & CAP_STATUS32) {
3652 smb_buffer->Flags2 |= SMBFLG2_ERR_STATUS;
3653 }
3654 if (ses->capabilities & CAP_DFS) {
3655 smb_buffer->Flags2 |= SMBFLG2_DFS;
3656 }
3657 if (ses->capabilities & CAP_UNICODE) {
3658 smb_buffer->Flags2 |= SMBFLG2_UNICODE;
3659 length =
3660 cifs_strtoUTF16((__le16 *) bcc_ptr, tree,
3661 6 /* max utf8 char length in bytes */ *
3662 (/* server len*/ + 256 /* share len */), nls_codepage);
3663 bcc_ptr += 2 * length; /* convert num 16 bit words to bytes */
3664 bcc_ptr += 2; /* skip trailing null */
3665 } else { /* ASCII */
3666 strcpy(bcc_ptr, tree);
3667 bcc_ptr += strlen(tree) + 1;
3668 }
3669 strcpy(bcc_ptr, "?????");
3670 bcc_ptr += strlen("?????");
3671 bcc_ptr += 1;
3672 count = bcc_ptr - &pSMB->Password[0];
3673 be32_add_cpu(&pSMB->hdr.smb_buf_length, count);
3674 pSMB->ByteCount = cpu_to_le16(count);
3675
3676 rc = SendReceive(xid, ses, smb_buffer, smb_buffer_response, &length,
3677 0);
3678
3679 /* above now done in SendReceive */
3680 if (rc == 0) {
3681 bool is_unicode;
3682
3683 tcon->tid = smb_buffer_response->Tid;
3684 bcc_ptr = pByteArea(smb_buffer_response);
3685 bytes_left = get_bcc(smb_buffer_response);
3686 length = strnlen(bcc_ptr, bytes_left - 2);
3687 if (smb_buffer->Flags2 & SMBFLG2_UNICODE)
3688 is_unicode = true;
3689 else
3690 is_unicode = false;
3691
3692
3693 /* skip service field (NB: this field is always ASCII) */
3694 if (length == 3) {
3695 if ((bcc_ptr[0] == 'I') && (bcc_ptr[1] == 'P') &&
3696 (bcc_ptr[2] == 'C')) {
3697 cifs_dbg(FYI, "IPC connection\n");
3698 tcon->ipc = true;
3699 tcon->pipe = true;
3700 }
3701 } else if (length == 2) {
3702 if ((bcc_ptr[0] == 'A') && (bcc_ptr[1] == ':')) {
3703 /* the most common case */
3704 cifs_dbg(FYI, "disk share connection\n");
3705 }
3706 }
3707 bcc_ptr += length + 1;
3708 bytes_left -= (length + 1);
3709 strscpy(tcon->tree_name, tree, sizeof(tcon->tree_name));
3710
3711 /* mostly informational -- no need to fail on error here */
3712 kfree(tcon->nativeFileSystem);
3713 tcon->nativeFileSystem = cifs_strndup_from_utf16(bcc_ptr,
3714 bytes_left, is_unicode,
3715 nls_codepage);
3716
3717 cifs_dbg(FYI, "nativeFileSystem=%s\n", tcon->nativeFileSystem);
3718
3719 if ((smb_buffer_response->WordCount == 3) ||
3720 (smb_buffer_response->WordCount == 7))
3721 /* field is in same location */
3722 tcon->Flags = le16_to_cpu(pSMBr->OptionalSupport);
3723 else
3724 tcon->Flags = 0;
3725 cifs_dbg(FYI, "Tcon flags: 0x%x\n", tcon->Flags);
3726 }
3727
3728 cifs_buf_release(smb_buffer);
3729 return rc;
3730 }
3731
3732 static void delayed_free(struct rcu_head *p)
3733 {
3734 struct cifs_sb_info *cifs_sb = container_of(p, struct cifs_sb_info, rcu);
3735
3736 unload_nls(cifs_sb->local_nls);
3737 smb3_cleanup_fs_context(cifs_sb->ctx);
3738 kfree(cifs_sb);
3739 }
3740
3741 void
3742 cifs_umount(struct cifs_sb_info *cifs_sb)
3743 {
3744 struct rb_root *root = &cifs_sb->tlink_tree;
3745 struct rb_node *node;
3746 struct tcon_link *tlink;
3747
3748 cancel_delayed_work_sync(&cifs_sb->prune_tlinks);
3749
3750 spin_lock(&cifs_sb->tlink_tree_lock);
3751 while ((node = rb_first(root))) {
3752 tlink = rb_entry(node, struct tcon_link, tl_rbnode);
3753 cifs_get_tlink(tlink);
3754 clear_bit(TCON_LINK_IN_TREE, &tlink->tl_flags);
3755 rb_erase(node, root);
3756
3757 spin_unlock(&cifs_sb->tlink_tree_lock);
3758 cifs_put_tlink(tlink);
3759 spin_lock(&cifs_sb->tlink_tree_lock);
3760 }
3761 spin_unlock(&cifs_sb->tlink_tree_lock);
3762
3763 kfree(cifs_sb->prepath);
3764 call_rcu(&cifs_sb->rcu, delayed_free);
3765 }
3766
3767 int
3768 cifs_negotiate_protocol(const unsigned int xid, struct cifs_ses *ses,
3769 struct TCP_Server_Info *server)
3770 {
3771 int rc = 0;
3772
3773 if (!server->ops->need_neg || !server->ops->negotiate)
3774 return -ENOSYS;
3775
3776 /* only send once per connect */
3777 spin_lock(&server->srv_lock);
3778 if (server->tcpStatus != CifsGood &&
3779 server->tcpStatus != CifsNew &&
3780 server->tcpStatus != CifsNeedNegotiate) {
3781 spin_unlock(&server->srv_lock);
3782 return -EHOSTDOWN;
3783 }
3784
3785 if (!server->ops->need_neg(server) &&
3786 server->tcpStatus == CifsGood) {
3787 spin_unlock(&server->srv_lock);
3788 return 0;
3789 }
3790
3791 server->tcpStatus = CifsInNegotiate;
3792 spin_unlock(&server->srv_lock);
3793
3794 rc = server->ops->negotiate(xid, ses, server);
3795 if (rc == 0) {
3796 spin_lock(&server->srv_lock);
3797 if (server->tcpStatus == CifsInNegotiate)
3798 server->tcpStatus = CifsGood;
3799 else
3800 rc = -EHOSTDOWN;
3801 spin_unlock(&server->srv_lock);
3802 } else {
3803 spin_lock(&server->srv_lock);
3804 if (server->tcpStatus == CifsInNegotiate)
3805 server->tcpStatus = CifsNeedNegotiate;
3806 spin_unlock(&server->srv_lock);
3807 }
3808
3809 return rc;
3810 }
3811
3812 int
3813 cifs_setup_session(const unsigned int xid, struct cifs_ses *ses,
3814 struct TCP_Server_Info *server,
3815 struct nls_table *nls_info)
3816 {
3817 int rc = -ENOSYS;
3818 struct TCP_Server_Info *pserver = SERVER_IS_CHAN(server) ? server->primary_server : server;
3819 struct sockaddr_in6 *addr6 = (struct sockaddr_in6 *)&pserver->dstaddr;
3820 struct sockaddr_in *addr = (struct sockaddr_in *)&pserver->dstaddr;
3821 bool is_binding = false;
3822
3823 spin_lock(&ses->ses_lock);
3824 cifs_dbg(FYI, "%s: channel connect bitmap: 0x%lx\n",
3825 __func__, ses->chans_need_reconnect);
3826
3827 if (ses->ses_status != SES_GOOD &&
3828 ses->ses_status != SES_NEW &&
3829 ses->ses_status != SES_NEED_RECON) {
3830 spin_unlock(&ses->ses_lock);
3831 return -EHOSTDOWN;
3832 }
3833
3834 /* only send once per connect */
3835 spin_lock(&ses->chan_lock);
3836 if (CIFS_ALL_CHANS_GOOD(ses)) {
3837 if (ses->ses_status == SES_NEED_RECON)
3838 ses->ses_status = SES_GOOD;
3839 spin_unlock(&ses->chan_lock);
3840 spin_unlock(&ses->ses_lock);
3841 return 0;
3842 }
3843
3844 cifs_chan_set_in_reconnect(ses, server);
3845 is_binding = !CIFS_ALL_CHANS_NEED_RECONNECT(ses);
3846 spin_unlock(&ses->chan_lock);
3847
3848 if (!is_binding)
3849 ses->ses_status = SES_IN_SETUP;
3850 spin_unlock(&ses->ses_lock);
3851
3852 /* update ses ip_addr only for primary chan */
3853 if (server == pserver) {
3854 if (server->dstaddr.ss_family == AF_INET6)
3855 scnprintf(ses->ip_addr, sizeof(ses->ip_addr), "%pI6", &addr6->sin6_addr);
3856 else
3857 scnprintf(ses->ip_addr, sizeof(ses->ip_addr), "%pI4", &addr->sin_addr);
3858 }
3859
3860 if (!is_binding) {
3861 ses->capabilities = server->capabilities;
3862 if (!linuxExtEnabled)
3863 ses->capabilities &= (~server->vals->cap_unix);
3864
3865 if (ses->auth_key.response) {
3866 cifs_dbg(FYI, "Free previous auth_key.response = %p\n",
3867 ses->auth_key.response);
3868 kfree_sensitive(ses->auth_key.response);
3869 ses->auth_key.response = NULL;
3870 ses->auth_key.len = 0;
3871 }
3872 }
3873
3874 cifs_dbg(FYI, "Security Mode: 0x%x Capabilities: 0x%x TimeAdjust: %d\n",
3875 server->sec_mode, server->capabilities, server->timeAdj);
3876
3877 if (server->ops->sess_setup)
3878 rc = server->ops->sess_setup(xid, ses, server, nls_info);
3879
3880 if (rc) {
3881 cifs_server_dbg(VFS, "Send error in SessSetup = %d\n", rc);
3882 spin_lock(&ses->ses_lock);
3883 if (ses->ses_status == SES_IN_SETUP)
3884 ses->ses_status = SES_NEED_RECON;
3885 spin_lock(&ses->chan_lock);
3886 cifs_chan_clear_in_reconnect(ses, server);
3887 spin_unlock(&ses->chan_lock);
3888 spin_unlock(&ses->ses_lock);
3889 } else {
3890 spin_lock(&ses->ses_lock);
3891 if (ses->ses_status == SES_IN_SETUP)
3892 ses->ses_status = SES_GOOD;
3893 spin_lock(&ses->chan_lock);
3894 cifs_chan_clear_in_reconnect(ses, server);
3895 cifs_chan_clear_need_reconnect(ses, server);
3896 spin_unlock(&ses->chan_lock);
3897 spin_unlock(&ses->ses_lock);
3898 }
3899
3900 return rc;
3901 }
3902
3903 static int
3904 cifs_set_vol_auth(struct smb3_fs_context *ctx, struct cifs_ses *ses)
3905 {
3906 ctx->sectype = ses->sectype;
3907
3908 /* krb5 is special, since we don't need username or pw */
3909 if (ctx->sectype == Kerberos)
3910 return 0;
3911
3912 return cifs_set_cifscreds(ctx, ses);
3913 }
3914
3915 static struct cifs_tcon *
3916 cifs_construct_tcon(struct cifs_sb_info *cifs_sb, kuid_t fsuid)
3917 {
3918 int rc;
3919 struct cifs_tcon *master_tcon = cifs_sb_master_tcon(cifs_sb);
3920 struct cifs_ses *ses;
3921 struct cifs_tcon *tcon = NULL;
3922 struct smb3_fs_context *ctx;
3923
3924 ctx = kzalloc(sizeof(*ctx), GFP_KERNEL);
3925 if (ctx == NULL)
3926 return ERR_PTR(-ENOMEM);
3927
3928 ctx->local_nls = cifs_sb->local_nls;
3929 ctx->linux_uid = fsuid;
3930 ctx->cred_uid = fsuid;
3931 ctx->UNC = master_tcon->tree_name;
3932 ctx->retry = master_tcon->retry;
3933 ctx->nocase = master_tcon->nocase;
3934 ctx->nohandlecache = master_tcon->nohandlecache;
3935 ctx->local_lease = master_tcon->local_lease;
3936 ctx->no_lease = master_tcon->no_lease;
3937 ctx->resilient = master_tcon->use_resilient;
3938 ctx->persistent = master_tcon->use_persistent;
3939 ctx->handle_timeout = master_tcon->handle_timeout;
3940 ctx->no_linux_ext = !master_tcon->unix_ext;
3941 ctx->linux_ext = master_tcon->posix_extensions;
3942 ctx->sectype = master_tcon->ses->sectype;
3943 ctx->sign = master_tcon->ses->sign;
3944 ctx->seal = master_tcon->seal;
3945 ctx->witness = master_tcon->use_witness;
3946
3947 rc = cifs_set_vol_auth(ctx, master_tcon->ses);
3948 if (rc) {
3949 tcon = ERR_PTR(rc);
3950 goto out;
3951 }
3952
3953 /* get a reference for the same TCP session */
3954 spin_lock(&cifs_tcp_ses_lock);
3955 ++master_tcon->ses->server->srv_count;
3956 spin_unlock(&cifs_tcp_ses_lock);
3957
3958 ses = cifs_get_smb_ses(master_tcon->ses->server, ctx);
3959 if (IS_ERR(ses)) {
3960 tcon = (struct cifs_tcon *)ses;
3961 cifs_put_tcp_session(master_tcon->ses->server, 0);
3962 goto out;
3963 }
3964
3965 tcon = cifs_get_tcon(ses, ctx);
3966 if (IS_ERR(tcon)) {
3967 cifs_put_smb_ses(ses);
3968 goto out;
3969 }
3970
3971 #ifdef CONFIG_CIFS_ALLOW_INSECURE_LEGACY
3972 if (cap_unix(ses))
3973 reset_cifs_unix_caps(0, tcon, NULL, ctx);
3974 #endif /* CONFIG_CIFS_ALLOW_INSECURE_LEGACY */
3975
3976 out:
3977 kfree(ctx->username);
3978 kfree_sensitive(ctx->password);
3979 kfree(ctx);
3980
3981 return tcon;
3982 }
3983
3984 struct cifs_tcon *
3985 cifs_sb_master_tcon(struct cifs_sb_info *cifs_sb)
3986 {
3987 return tlink_tcon(cifs_sb_master_tlink(cifs_sb));
3988 }
3989
3990 /* find and return a tlink with given uid */
3991 static struct tcon_link *
3992 tlink_rb_search(struct rb_root *root, kuid_t uid)
3993 {
3994 struct rb_node *node = root->rb_node;
3995 struct tcon_link *tlink;
3996
3997 while (node) {
3998 tlink = rb_entry(node, struct tcon_link, tl_rbnode);
3999
4000 if (uid_gt(tlink->tl_uid, uid))
4001 node = node->rb_left;
4002 else if (uid_lt(tlink->tl_uid, uid))
4003 node = node->rb_right;
4004 else
4005 return tlink;
4006 }
4007 return NULL;
4008 }
4009
4010 /* insert a tcon_link into the tree */
4011 static void
4012 tlink_rb_insert(struct rb_root *root, struct tcon_link *new_tlink)
4013 {
4014 struct rb_node **new = &(root->rb_node), *parent = NULL;
4015 struct tcon_link *tlink;
4016
4017 while (*new) {
4018 tlink = rb_entry(*new, struct tcon_link, tl_rbnode);
4019 parent = *new;
4020
4021 if (uid_gt(tlink->tl_uid, new_tlink->tl_uid))
4022 new = &((*new)->rb_left);
4023 else
4024 new = &((*new)->rb_right);
4025 }
4026
4027 rb_link_node(&new_tlink->tl_rbnode, parent, new);
4028 rb_insert_color(&new_tlink->tl_rbnode, root);
4029 }
4030
4031 /*
4032 * Find or construct an appropriate tcon given a cifs_sb and the fsuid of the
4033 * current task.
4034 *
4035 * If the superblock doesn't refer to a multiuser mount, then just return
4036 * the master tcon for the mount.
4037 *
4038 * First, search the rbtree for an existing tcon for this fsuid. If one
4039 * exists, then check to see if it's pending construction. If it is then wait
4040 * for construction to complete. Once it's no longer pending, check to see if
4041 * it failed and either return an error or retry construction, depending on
4042 * the timeout.
4043 *
4044 * If one doesn't exist then insert a new tcon_link struct into the tree and
4045 * try to construct a new one.
4046 */
4047 struct tcon_link *
4048 cifs_sb_tlink(struct cifs_sb_info *cifs_sb)
4049 {
4050 int ret;
4051 kuid_t fsuid = current_fsuid();
4052 struct tcon_link *tlink, *newtlink;
4053
4054 if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MULTIUSER))
4055 return cifs_get_tlink(cifs_sb_master_tlink(cifs_sb));
4056
4057 spin_lock(&cifs_sb->tlink_tree_lock);
4058 tlink = tlink_rb_search(&cifs_sb->tlink_tree, fsuid);
4059 if (tlink)
4060 cifs_get_tlink(tlink);
4061 spin_unlock(&cifs_sb->tlink_tree_lock);
4062
4063 if (tlink == NULL) {
4064 newtlink = kzalloc(sizeof(*tlink), GFP_KERNEL);
4065 if (newtlink == NULL)
4066 return ERR_PTR(-ENOMEM);
4067 newtlink->tl_uid = fsuid;
4068 newtlink->tl_tcon = ERR_PTR(-EACCES);
4069 set_bit(TCON_LINK_PENDING, &newtlink->tl_flags);
4070 set_bit(TCON_LINK_IN_TREE, &newtlink->tl_flags);
4071 cifs_get_tlink(newtlink);
4072
4073 spin_lock(&cifs_sb->tlink_tree_lock);
4074 /* was one inserted after previous search? */
4075 tlink = tlink_rb_search(&cifs_sb->tlink_tree, fsuid);
4076 if (tlink) {
4077 cifs_get_tlink(tlink);
4078 spin_unlock(&cifs_sb->tlink_tree_lock);
4079 kfree(newtlink);
4080 goto wait_for_construction;
4081 }
4082 tlink = newtlink;
4083 tlink_rb_insert(&cifs_sb->tlink_tree, tlink);
4084 spin_unlock(&cifs_sb->tlink_tree_lock);
4085 } else {
4086 wait_for_construction:
4087 ret = wait_on_bit(&tlink->tl_flags, TCON_LINK_PENDING,
4088 TASK_INTERRUPTIBLE);
4089 if (ret) {
4090 cifs_put_tlink(tlink);
4091 return ERR_PTR(-ERESTARTSYS);
4092 }
4093
4094 /* if it's good, return it */
4095 if (!IS_ERR(tlink->tl_tcon))
4096 return tlink;
4097
4098 /* return error if we tried this already recently */
4099 if (time_before(jiffies, tlink->tl_time + TLINK_ERROR_EXPIRE)) {
4100 cifs_put_tlink(tlink);
4101 return ERR_PTR(-EACCES);
4102 }
4103
4104 if (test_and_set_bit(TCON_LINK_PENDING, &tlink->tl_flags))
4105 goto wait_for_construction;
4106 }
4107
4108 tlink->tl_tcon = cifs_construct_tcon(cifs_sb, fsuid);
4109 clear_bit(TCON_LINK_PENDING, &tlink->tl_flags);
4110 wake_up_bit(&tlink->tl_flags, TCON_LINK_PENDING);
4111
4112 if (IS_ERR(tlink->tl_tcon)) {
4113 cifs_put_tlink(tlink);
4114 return ERR_PTR(-EACCES);
4115 }
4116
4117 return tlink;
4118 }
4119
4120 /*
4121 * periodic workqueue job that scans tcon_tree for a superblock and closes
4122 * out tcons.
4123 */
4124 static void
4125 cifs_prune_tlinks(struct work_struct *work)
4126 {
4127 struct cifs_sb_info *cifs_sb = container_of(work, struct cifs_sb_info,
4128 prune_tlinks.work);
4129 struct rb_root *root = &cifs_sb->tlink_tree;
4130 struct rb_node *node;
4131 struct rb_node *tmp;
4132 struct tcon_link *tlink;
4133
4134 /*
4135 * Because we drop the spinlock in the loop in order to put the tlink
4136 * it's not guarded against removal of links from the tree. The only
4137 * places that remove entries from the tree are this function and
4138 * umounts. Because this function is non-reentrant and is canceled
4139 * before umount can proceed, this is safe.
4140 */
4141 spin_lock(&cifs_sb->tlink_tree_lock);
4142 node = rb_first(root);
4143 while (node != NULL) {
4144 tmp = node;
4145 node = rb_next(tmp);
4146 tlink = rb_entry(tmp, struct tcon_link, tl_rbnode);
4147
4148 if (test_bit(TCON_LINK_MASTER, &tlink->tl_flags) ||
4149 atomic_read(&tlink->tl_count) != 0 ||
4150 time_after(tlink->tl_time + TLINK_IDLE_EXPIRE, jiffies))
4151 continue;
4152
4153 cifs_get_tlink(tlink);
4154 clear_bit(TCON_LINK_IN_TREE, &tlink->tl_flags);
4155 rb_erase(tmp, root);
4156
4157 spin_unlock(&cifs_sb->tlink_tree_lock);
4158 cifs_put_tlink(tlink);
4159 spin_lock(&cifs_sb->tlink_tree_lock);
4160 }
4161 spin_unlock(&cifs_sb->tlink_tree_lock);
4162
4163 queue_delayed_work(cifsiod_wq, &cifs_sb->prune_tlinks,
4164 TLINK_IDLE_EXPIRE);
4165 }
4166
4167 #ifndef CONFIG_CIFS_DFS_UPCALL
4168 int cifs_tree_connect(const unsigned int xid, struct cifs_tcon *tcon, const struct nls_table *nlsc)
4169 {
4170 int rc;
4171 const struct smb_version_operations *ops = tcon->ses->server->ops;
4172
4173 /* only send once per connect */
4174 spin_lock(&tcon->tc_lock);
4175 if (tcon->status == TID_GOOD) {
4176 spin_unlock(&tcon->tc_lock);
4177 return 0;
4178 }
4179
4180 if (tcon->status != TID_NEW &&
4181 tcon->status != TID_NEED_TCON) {
4182 spin_unlock(&tcon->tc_lock);
4183 return -EHOSTDOWN;
4184 }
4185
4186 tcon->status = TID_IN_TCON;
4187 spin_unlock(&tcon->tc_lock);
4188
4189 rc = ops->tree_connect(xid, tcon->ses, tcon->tree_name, tcon, nlsc);
4190 if (rc) {
4191 spin_lock(&tcon->tc_lock);
4192 if (tcon->status == TID_IN_TCON)
4193 tcon->status = TID_NEED_TCON;
4194 spin_unlock(&tcon->tc_lock);
4195 } else {
4196 spin_lock(&tcon->tc_lock);
4197 if (tcon->status == TID_IN_TCON)
4198 tcon->status = TID_GOOD;
4199 tcon->need_reconnect = false;
4200 spin_unlock(&tcon->tc_lock);
4201 }
4202
4203 return rc;
4204 }
4205 #endif
Mirror https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git