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1/*
2 * fs/cifs/connect.c
3 *
4 * Copyright (C) International Business Machines Corp., 2002,2009
5 * Author(s): Steve French (sfrench@us.ibm.com)
6 *
7 * This library is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU Lesser General Public License as published
9 * by the Free Software Foundation; either version 2.1 of the License, or
10 * (at your option) any later version.
11 *
12 * This library is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See
15 * the GNU Lesser General Public License for more details.
16 *
17 * You should have received a copy of the GNU Lesser General Public License
18 * along with this library; if not, write to the Free Software
19 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
20 */
21#include <linux/fs.h>
22#include <linux/net.h>
23#include <linux/string.h>
24#include <linux/list.h>
25#include <linux/wait.h>
26#include <linux/slab.h>
27#include <linux/pagemap.h>
28#include <linux/ctype.h>
29#include <linux/utsname.h>
30#include <linux/mempool.h>
31#include <linux/delay.h>
32#include <linux/completion.h>
33#include <linux/kthread.h>
34#include <linux/pagevec.h>
35#include <linux/freezer.h>
36#include <linux/namei.h>
37#include <asm/uaccess.h>
38#include <asm/processor.h>
39#include <linux/inet.h>
40#include <net/ipv6.h>
41#include "cifspdu.h"
42#include "cifsglob.h"
43#include "cifsproto.h"
44#include "cifs_unicode.h"
45#include "cifs_debug.h"
46#include "cifs_fs_sb.h"
47#include "ntlmssp.h"
48#include "nterr.h"
49#include "rfc1002pdu.h"
50#include "fscache.h"
51
52#define CIFS_PORT 445
53#define RFC1001_PORT 139
54
55/* SMB echo "timeout" -- FIXME: tunable? */
56#define SMB_ECHO_INTERVAL (60 * HZ)
57
58extern mempool_t *cifs_req_poolp;
59
60/* FIXME: should these be tunable? */
61#define TLINK_ERROR_EXPIRE (1 * HZ)
62#define TLINK_IDLE_EXPIRE (600 * HZ)
63
64static int ip_connect(struct TCP_Server_Info *server);
65static int generic_ip_connect(struct TCP_Server_Info *server);
66static void tlink_rb_insert(struct rb_root *root, struct tcon_link *new_tlink);
67static void cifs_prune_tlinks(struct work_struct *work);
68static int cifs_setup_volume_info(struct smb_vol *volume_info, char *mount_data,
69 const char *devname);
70
71/*
72 * cifs tcp session reconnection
73 *
74 * mark tcp session as reconnecting so temporarily locked
75 * mark all smb sessions as reconnecting for tcp session
76 * reconnect tcp session
77 * wake up waiters on reconnection? - (not needed currently)
78 */
79static int
80cifs_reconnect(struct TCP_Server_Info *server)
81{
82 int rc = 0;
83 struct list_head *tmp, *tmp2;
84 struct cifs_ses *ses;
85 struct cifs_tcon *tcon;
86 struct mid_q_entry *mid_entry;
87 struct list_head retry_list;
88
89 spin_lock(&GlobalMid_Lock);
90 if (server->tcpStatus == CifsExiting) {
91 /* the demux thread will exit normally
92 next time through the loop */
93 spin_unlock(&GlobalMid_Lock);
94 return rc;
95 } else
96 server->tcpStatus = CifsNeedReconnect;
97 spin_unlock(&GlobalMid_Lock);
98 server->maxBuf = 0;
99
100 cFYI(1, "Reconnecting tcp session");
101
102 /* before reconnecting the tcp session, mark the smb session (uid)
103 and the tid bad so they are not used until reconnected */
104 cFYI(1, "%s: marking sessions and tcons for reconnect", __func__);
105 spin_lock(&cifs_tcp_ses_lock);
106 list_for_each(tmp, &server->smb_ses_list) {
107 ses = list_entry(tmp, struct cifs_ses, smb_ses_list);
108 ses->need_reconnect = true;
109 ses->ipc_tid = 0;
110 list_for_each(tmp2, &ses->tcon_list) {
111 tcon = list_entry(tmp2, struct cifs_tcon, tcon_list);
112 tcon->need_reconnect = true;
113 }
114 }
115 spin_unlock(&cifs_tcp_ses_lock);
116
117 /* do not want to be sending data on a socket we are freeing */
118 cFYI(1, "%s: tearing down socket", __func__);
119 mutex_lock(&server->srv_mutex);
120 if (server->ssocket) {
121 cFYI(1, "State: 0x%x Flags: 0x%lx", server->ssocket->state,
122 server->ssocket->flags);
123 kernel_sock_shutdown(server->ssocket, SHUT_WR);
124 cFYI(1, "Post shutdown state: 0x%x Flags: 0x%lx",
125 server->ssocket->state,
126 server->ssocket->flags);
127 sock_release(server->ssocket);
128 server->ssocket = NULL;
129 }
130 server->sequence_number = 0;
131 server->session_estab = false;
132 kfree(server->session_key.response);
133 server->session_key.response = NULL;
134 server->session_key.len = 0;
135 server->lstrp = jiffies;
136 mutex_unlock(&server->srv_mutex);
137
138 /* mark submitted MIDs for retry and issue callback */
139 INIT_LIST_HEAD(&retry_list);
140 cFYI(1, "%s: moving mids to private list", __func__);
141 spin_lock(&GlobalMid_Lock);
142 list_for_each_safe(tmp, tmp2, &server->pending_mid_q) {
143 mid_entry = list_entry(tmp, struct mid_q_entry, qhead);
144 if (mid_entry->midState == MID_REQUEST_SUBMITTED)
145 mid_entry->midState = MID_RETRY_NEEDED;
146 list_move(&mid_entry->qhead, &retry_list);
147 }
148 spin_unlock(&GlobalMid_Lock);
149
150 cFYI(1, "%s: issuing mid callbacks", __func__);
151 list_for_each_safe(tmp, tmp2, &retry_list) {
152 mid_entry = list_entry(tmp, struct mid_q_entry, qhead);
153 list_del_init(&mid_entry->qhead);
154 mid_entry->callback(mid_entry);
155 }
156
157 do {
158 try_to_freeze();
159
160 /* we should try only the port we connected to before */
161 rc = generic_ip_connect(server);
162 if (rc) {
163 cFYI(1, "reconnect error %d", rc);
164 msleep(3000);
165 } else {
166 atomic_inc(&tcpSesReconnectCount);
167 spin_lock(&GlobalMid_Lock);
168 if (server->tcpStatus != CifsExiting)
169 server->tcpStatus = CifsNeedNegotiate;
170 spin_unlock(&GlobalMid_Lock);
171 }
172 } while (server->tcpStatus == CifsNeedReconnect);
173
174 return rc;
175}
176
177/*
178 return codes:
179 0 not a transact2, or all data present
180 >0 transact2 with that much data missing
181 -EINVAL = invalid transact2
182
183 */
184static int check2ndT2(struct smb_hdr *pSMB, unsigned int maxBufSize)
185{
186 struct smb_t2_rsp *pSMBt;
187 int remaining;
188 __u16 total_data_size, data_in_this_rsp;
189
190 if (pSMB->Command != SMB_COM_TRANSACTION2)
191 return 0;
192
193 /* check for plausible wct, bcc and t2 data and parm sizes */
194 /* check for parm and data offset going beyond end of smb */
195 if (pSMB->WordCount != 10) { /* coalesce_t2 depends on this */
196 cFYI(1, "invalid transact2 word count");
197 return -EINVAL;
198 }
199
200 pSMBt = (struct smb_t2_rsp *)pSMB;
201
202 total_data_size = get_unaligned_le16(&pSMBt->t2_rsp.TotalDataCount);
203 data_in_this_rsp = get_unaligned_le16(&pSMBt->t2_rsp.DataCount);
204
205 if (total_data_size == data_in_this_rsp)
206 return 0;
207 else if (total_data_size < data_in_this_rsp) {
208 cFYI(1, "total data %d smaller than data in frame %d",
209 total_data_size, data_in_this_rsp);
210 return -EINVAL;
211 }
212
213 remaining = total_data_size - data_in_this_rsp;
214
215 cFYI(1, "missing %d bytes from transact2, check next response",
216 remaining);
217 if (total_data_size > maxBufSize) {
218 cERROR(1, "TotalDataSize %d is over maximum buffer %d",
219 total_data_size, maxBufSize);
220 return -EINVAL;
221 }
222 return remaining;
223}
224
225static int coalesce_t2(struct smb_hdr *psecond, struct smb_hdr *pTargetSMB)
226{
227 struct smb_t2_rsp *pSMB2 = (struct smb_t2_rsp *)psecond;
228 struct smb_t2_rsp *pSMBt = (struct smb_t2_rsp *)pTargetSMB;
229 char *data_area_of_target;
230 char *data_area_of_buf2;
231 int remaining;
232 unsigned int byte_count, total_in_buf;
233 __u16 total_data_size, total_in_buf2;
234
235 total_data_size = get_unaligned_le16(&pSMBt->t2_rsp.TotalDataCount);
236
237 if (total_data_size !=
238 get_unaligned_le16(&pSMB2->t2_rsp.TotalDataCount))
239 cFYI(1, "total data size of primary and secondary t2 differ");
240
241 total_in_buf = get_unaligned_le16(&pSMBt->t2_rsp.DataCount);
242
243 remaining = total_data_size - total_in_buf;
244
245 if (remaining < 0)
246 return -EPROTO;
247
248 if (remaining == 0) /* nothing to do, ignore */
249 return 0;
250
251 total_in_buf2 = get_unaligned_le16(&pSMB2->t2_rsp.DataCount);
252 if (remaining < total_in_buf2) {
253 cFYI(1, "transact2 2nd response contains too much data");
254 }
255
256 /* find end of first SMB data area */
257 data_area_of_target = (char *)&pSMBt->hdr.Protocol +
258 get_unaligned_le16(&pSMBt->t2_rsp.DataOffset);
259 /* validate target area */
260
261 data_area_of_buf2 = (char *)&pSMB2->hdr.Protocol +
262 get_unaligned_le16(&pSMB2->t2_rsp.DataOffset);
263
264 data_area_of_target += total_in_buf;
265
266 /* copy second buffer into end of first buffer */
267 total_in_buf += total_in_buf2;
268 /* is the result too big for the field? */
269 if (total_in_buf > USHRT_MAX)
270 return -EPROTO;
271 put_unaligned_le16(total_in_buf, &pSMBt->t2_rsp.DataCount);
272
273 /* fix up the BCC */
274 byte_count = get_bcc(pTargetSMB);
275 byte_count += total_in_buf2;
276 /* is the result too big for the field? */
277 if (byte_count > USHRT_MAX)
278 return -EPROTO;
279 put_bcc(byte_count, pTargetSMB);
280
281 byte_count = be32_to_cpu(pTargetSMB->smb_buf_length);
282 byte_count += total_in_buf2;
283 /* don't allow buffer to overflow */
284 if (byte_count > CIFSMaxBufSize)
285 return -ENOBUFS;
286 pTargetSMB->smb_buf_length = cpu_to_be32(byte_count);
287
288 memcpy(data_area_of_target, data_area_of_buf2, total_in_buf2);
289
290 if (remaining == total_in_buf2) {
291 cFYI(1, "found the last secondary response");
292 return 0; /* we are done */
293 } else /* more responses to go */
294 return 1;
295}
296
297static void
298cifs_echo_request(struct work_struct *work)
299{
300 int rc;
301 struct TCP_Server_Info *server = container_of(work,
302 struct TCP_Server_Info, echo.work);
303
304 /*
305 * We cannot send an echo until the NEGOTIATE_PROTOCOL request is
306 * done, which is indicated by maxBuf != 0. Also, no need to ping if
307 * we got a response recently
308 */
309 if (server->maxBuf == 0 ||
310 time_before(jiffies, server->lstrp + SMB_ECHO_INTERVAL - HZ))
311 goto requeue_echo;
312
313 rc = CIFSSMBEcho(server);
314 if (rc)
315 cFYI(1, "Unable to send echo request to server: %s",
316 server->hostname);
317
318requeue_echo:
319 queue_delayed_work(system_nrt_wq, &server->echo, SMB_ECHO_INTERVAL);
320}
321
322static bool
323allocate_buffers(char **bigbuf, char **smallbuf, unsigned int size,
324 bool is_large_buf)
325{
326 char *bbuf = *bigbuf, *sbuf = *smallbuf;
327
328 if (bbuf == NULL) {
329 bbuf = (char *)cifs_buf_get();
330 if (!bbuf) {
331 cERROR(1, "No memory for large SMB response");
332 msleep(3000);
333 /* retry will check if exiting */
334 return false;
335 }
336 } else if (is_large_buf) {
337 /* we are reusing a dirty large buf, clear its start */
338 memset(bbuf, 0, size);
339 }
340
341 if (sbuf == NULL) {
342 sbuf = (char *)cifs_small_buf_get();
343 if (!sbuf) {
344 cERROR(1, "No memory for SMB response");
345 msleep(1000);
346 /* retry will check if exiting */
347 return false;
348 }
349 /* beginning of smb buffer is cleared in our buf_get */
350 } else {
351 /* if existing small buf clear beginning */
352 memset(sbuf, 0, size);
353 }
354
355 *bigbuf = bbuf;
356 *smallbuf = sbuf;
357
358 return true;
359}
360
361static int
362read_from_socket(struct TCP_Server_Info *server, struct msghdr *smb_msg,
363 struct kvec *iov, unsigned int to_read,
364 unsigned int *ptotal_read, bool is_header_read)
365{
366 int length, rc = 0;
367 unsigned int total_read;
368 char *buf = iov->iov_base;
369
370 for (total_read = 0; total_read < to_read; total_read += length) {
371 length = kernel_recvmsg(server->ssocket, smb_msg, iov, 1,
372 to_read - total_read, 0);
373 if (server->tcpStatus == CifsExiting) {
374 /* then will exit */
375 rc = 2;
376 break;
377 } else if (server->tcpStatus == CifsNeedReconnect) {
378 cifs_reconnect(server);
379 /* Reconnect wakes up rspns q */
380 /* Now we will reread sock */
381 rc = 1;
382 break;
383 } else if (length == -ERESTARTSYS ||
384 length == -EAGAIN ||
385 length == -EINTR) {
386 /*
387 * Minimum sleep to prevent looping, allowing socket
388 * to clear and app threads to set tcpStatus
389 * CifsNeedReconnect if server hung.
390 */
391 usleep_range(1000, 2000);
392 length = 0;
393 if (!is_header_read)
394 continue;
395 /* Special handling for header read */
396 if (total_read) {
397 iov->iov_base = (to_read - total_read) +
398 buf;
399 iov->iov_len = to_read - total_read;
400 smb_msg->msg_control = NULL;
401 smb_msg->msg_controllen = 0;
402 rc = 3;
403 } else
404 rc = 1;
405 break;
406 } else if (length <= 0) {
407 cERROR(1, "Received no data, expecting %d",
408 to_read - total_read);
409 cifs_reconnect(server);
410 rc = 1;
411 break;
412 }
413 }
414
415 *ptotal_read = total_read;
416 return rc;
417}
418
419static bool
420check_rfc1002_header(struct TCP_Server_Info *server, char *buf)
421{
422 char temp = *buf;
423 unsigned int pdu_length = be32_to_cpu(
424 ((struct smb_hdr *)buf)->smb_buf_length);
425
426 /*
427 * The first byte big endian of the length field,
428 * is actually not part of the length but the type
429 * with the most common, zero, as regular data.
430 */
431 if (temp == (char) RFC1002_SESSION_KEEP_ALIVE) {
432 return false;
433 } else if (temp == (char)RFC1002_POSITIVE_SESSION_RESPONSE) {
434 cFYI(1, "Good RFC 1002 session rsp");
435 return false;
436 } else if (temp == (char)RFC1002_NEGATIVE_SESSION_RESPONSE) {
437 /*
438 * We get this from Windows 98 instead of an error on
439 * SMB negprot response.
440 */
441 cFYI(1, "Negative RFC1002 Session Response Error 0x%x)",
442 pdu_length);
443 /* give server a second to clean up */
444 msleep(1000);
445 /*
446 * Always try 445 first on reconnect since we get NACK
447 * on some if we ever connected to port 139 (the NACK
448 * is since we do not begin with RFC1001 session
449 * initialize frame).
450 */
451 cifs_set_port((struct sockaddr *)
452 &server->dstaddr, CIFS_PORT);
453 cifs_reconnect(server);
454 wake_up(&server->response_q);
455 return false;
456 } else if (temp != (char) 0) {
457 cERROR(1, "Unknown RFC 1002 frame");
458 cifs_dump_mem(" Received Data: ", buf, 4);
459 cifs_reconnect(server);
460 return false;
461 }
462
463 /* else we have an SMB response */
464 if ((pdu_length > CIFSMaxBufSize + MAX_CIFS_HDR_SIZE - 4) ||
465 (pdu_length < sizeof(struct smb_hdr) - 1 - 4)) {
466 cERROR(1, "Invalid size SMB length %d pdu_length %d",
467 4, pdu_length+4);
468 cifs_reconnect(server);
469 wake_up(&server->response_q);
470 return false;
471 }
472
473 return true;
474}
475
476static struct mid_q_entry *
477find_cifs_mid(struct TCP_Server_Info *server, struct smb_hdr *buf,
478 int *length, bool is_large_buf, bool *is_multi_rsp, char **bigbuf)
479{
480 struct mid_q_entry *mid = NULL, *tmp_mid, *ret = NULL;
481
482 spin_lock(&GlobalMid_Lock);
483 list_for_each_entry_safe(mid, tmp_mid, &server->pending_mid_q, qhead) {
484 if (mid->mid != buf->Mid ||
485 mid->midState != MID_REQUEST_SUBMITTED ||
486 mid->command != buf->Command)
487 continue;
488
489 if (*length == 0 && check2ndT2(buf, server->maxBuf) > 0) {
490 /* We have a multipart transact2 resp */
491 *is_multi_rsp = true;
492 if (mid->resp_buf) {
493 /* merge response - fix up 1st*/
494 *length = coalesce_t2(buf, mid->resp_buf);
495 if (*length > 0) {
496 *length = 0;
497 mid->multiRsp = true;
498 break;
499 }
500 /* All parts received or packet is malformed. */
501 mid->multiEnd = true;
502 goto multi_t2_fnd;
503 }
504 if (!is_large_buf) {
505 /*FIXME: switch to already allocated largebuf?*/
506 cERROR(1, "1st trans2 resp needs bigbuf");
507 } else {
508 /* Have first buffer */
509 mid->resp_buf = buf;
510 mid->largeBuf = true;
511 *bigbuf = NULL;
512 }
513 break;
514 }
515 mid->resp_buf = buf;
516 mid->largeBuf = is_large_buf;
517multi_t2_fnd:
518 if (*length == 0)
519 mid->midState = MID_RESPONSE_RECEIVED;
520 else
521 mid->midState = MID_RESPONSE_MALFORMED;
522#ifdef CONFIG_CIFS_STATS2
523 mid->when_received = jiffies;
524#endif
525 list_del_init(&mid->qhead);
526 ret = mid;
527 break;
528 }
529 spin_unlock(&GlobalMid_Lock);
530
531 return ret;
532}
533
534static void clean_demultiplex_info(struct TCP_Server_Info *server)
535{
536 int length;
537
538 /* take it off the list, if it's not already */
539 spin_lock(&cifs_tcp_ses_lock);
540 list_del_init(&server->tcp_ses_list);
541 spin_unlock(&cifs_tcp_ses_lock);
542
543 spin_lock(&GlobalMid_Lock);
544 server->tcpStatus = CifsExiting;
545 spin_unlock(&GlobalMid_Lock);
546 wake_up_all(&server->response_q);
547
548 /*
549 * Check if we have blocked requests that need to free. Note that
550 * cifs_max_pending is normally 50, but can be set at module install
551 * time to as little as two.
552 */
553 spin_lock(&GlobalMid_Lock);
554 if (atomic_read(&server->inFlight) >= cifs_max_pending)
555 atomic_set(&server->inFlight, cifs_max_pending - 1);
556 /*
557 * We do not want to set the max_pending too low or we could end up
558 * with the counter going negative.
559 */
560 spin_unlock(&GlobalMid_Lock);
561 /*
562 * Although there should not be any requests blocked on this queue it
563 * can not hurt to be paranoid and try to wake up requests that may
564 * haven been blocked when more than 50 at time were on the wire to the
565 * same server - they now will see the session is in exit state and get
566 * out of SendReceive.
567 */
568 wake_up_all(&server->request_q);
569 /* give those requests time to exit */
570 msleep(125);
571
572 if (server->ssocket) {
573 sock_release(server->ssocket);
574 server->ssocket = NULL;
575 }
576
577 if (!list_empty(&server->pending_mid_q)) {
578 struct list_head dispose_list;
579 struct mid_q_entry *mid_entry;
580 struct list_head *tmp, *tmp2;
581
582 INIT_LIST_HEAD(&dispose_list);
583 spin_lock(&GlobalMid_Lock);
584 list_for_each_safe(tmp, tmp2, &server->pending_mid_q) {
585 mid_entry = list_entry(tmp, struct mid_q_entry, qhead);
586 cFYI(1, "Clearing mid 0x%x", mid_entry->mid);
587 mid_entry->midState = MID_SHUTDOWN;
588 list_move(&mid_entry->qhead, &dispose_list);
589 }
590 spin_unlock(&GlobalMid_Lock);
591
592 /* now walk dispose list and issue callbacks */
593 list_for_each_safe(tmp, tmp2, &dispose_list) {
594 mid_entry = list_entry(tmp, struct mid_q_entry, qhead);
595 cFYI(1, "Callback mid 0x%x", mid_entry->mid);
596 list_del_init(&mid_entry->qhead);
597 mid_entry->callback(mid_entry);
598 }
599 /* 1/8th of sec is more than enough time for them to exit */
600 msleep(125);
601 }
602
603 if (!list_empty(&server->pending_mid_q)) {
604 /*
605 * mpx threads have not exited yet give them at least the smb
606 * send timeout time for long ops.
607 *
608 * Due to delays on oplock break requests, we need to wait at
609 * least 45 seconds before giving up on a request getting a
610 * response and going ahead and killing cifsd.
611 */
612 cFYI(1, "Wait for exit from demultiplex thread");
613 msleep(46000);
614 /*
615 * If threads still have not exited they are probably never
616 * coming home not much else we can do but free the memory.
617 */
618 }
619
620 kfree(server->hostname);
621 kfree(server);
622
623 length = atomic_dec_return(&tcpSesAllocCount);
624 if (length > 0)
625 mempool_resize(cifs_req_poolp, length + cifs_min_rcv,
626 GFP_KERNEL);
627}
628
629static int
630cifs_demultiplex_thread(void *p)
631{
632 int length;
633 struct TCP_Server_Info *server = p;
634 unsigned int pdu_length, total_read;
635 char *buf = NULL, *bigbuf = NULL, *smallbuf = NULL;
636 struct smb_hdr *smb_buffer = NULL;
637 struct msghdr smb_msg;
638 struct kvec iov;
639 struct task_struct *task_to_wake = NULL;
640 struct mid_q_entry *mid_entry;
641 bool isLargeBuf = false;
642 bool isMultiRsp = false;
643 int rc;
644
645 current->flags |= PF_MEMALLOC;
646 cFYI(1, "Demultiplex PID: %d", task_pid_nr(current));
647
648 length = atomic_inc_return(&tcpSesAllocCount);
649 if (length > 1)
650 mempool_resize(cifs_req_poolp, length + cifs_min_rcv,
651 GFP_KERNEL);
652
653 set_freezable();
654 while (server->tcpStatus != CifsExiting) {
655 if (try_to_freeze())
656 continue;
657
658 if (!allocate_buffers(&bigbuf, &smallbuf,
659 sizeof(struct smb_hdr), isLargeBuf))
660 continue;
661
662 isLargeBuf = false;
663 isMultiRsp = false;
664 smb_buffer = (struct smb_hdr *)smallbuf;
665 buf = smallbuf;
666 iov.iov_base = buf;
667 iov.iov_len = 4;
668 smb_msg.msg_control = NULL;
669 smb_msg.msg_controllen = 0;
670 pdu_length = 4; /* enough to get RFC1001 header */
671
672incomplete_rcv:
673 if (echo_retries > 0 && server->tcpStatus == CifsGood &&
674 time_after(jiffies, server->lstrp +
675 (echo_retries * SMB_ECHO_INTERVAL))) {
676 cERROR(1, "Server %s has not responded in %d seconds. "
677 "Reconnecting...", server->hostname,
678 (echo_retries * SMB_ECHO_INTERVAL / HZ));
679 cifs_reconnect(server);
680 wake_up(&server->response_q);
681 continue;
682 }
683
684 rc = read_from_socket(server, &smb_msg, &iov, pdu_length,
685 &total_read, true /* header read */);
686 if (rc == 3)
687 goto incomplete_rcv;
688 else if (rc == 2)
689 break;
690 else if (rc == 1)
691 continue;
692
693 /*
694 * The right amount was read from socket - 4 bytes,
695 * so we can now interpret the length field.
696 */
697
698 /*
699 * Note that RFC 1001 length is big endian on the wire,
700 * but we convert it here so it is always manipulated
701 * as host byte order.
702 */
703 pdu_length = be32_to_cpu(smb_buffer->smb_buf_length);
704
705 cFYI(1, "rfc1002 length 0x%x", pdu_length+4);
706 if (!check_rfc1002_header(server, buf))
707 continue;
708
709 /* else length ok */
710 if (pdu_length > MAX_CIFS_SMALL_BUFFER_SIZE - 4) {
711 isLargeBuf = true;
712 memcpy(bigbuf, smallbuf, 4);
713 smb_buffer = (struct smb_hdr *)bigbuf;
714 buf = bigbuf;
715 }
716
717 iov.iov_base = 4 + buf;
718 iov.iov_len = pdu_length;
719 rc = read_from_socket(server, &smb_msg, &iov, pdu_length,
720 &total_read, false);
721 if (rc == 2)
722 break;
723 else if (rc == 1)
724 continue;
725
726 total_read += 4; /* account for rfc1002 hdr */
727
728 dump_smb(smb_buffer, total_read);
729
730 /*
731 * We know that we received enough to get to the MID as we
732 * checked the pdu_length earlier. Now check to see
733 * if the rest of the header is OK. We borrow the length
734 * var for the rest of the loop to avoid a new stack var.
735 *
736 * 48 bytes is enough to display the header and a little bit
737 * into the payload for debugging purposes.
738 */
739 length = checkSMB(smb_buffer, smb_buffer->Mid, total_read);
740 if (length != 0)
741 cifs_dump_mem("Bad SMB: ", buf,
742 min_t(unsigned int, total_read, 48));
743
744 server->lstrp = jiffies;
745
746 mid_entry = find_cifs_mid(server, smb_buffer, &length,
747 isLargeBuf, &isMultiRsp, &bigbuf);
748 if (mid_entry != NULL) {
749 mid_entry->callback(mid_entry);
750 /* Was previous buf put in mpx struct for multi-rsp? */
751 if (!isMultiRsp) {
752 /* smb buffer will be freed by user thread */
753 if (isLargeBuf)
754 bigbuf = NULL;
755 else
756 smallbuf = NULL;
757 }
758 } else if (length != 0) {
759 /* response sanity checks failed */
760 continue;
761 } else if (!is_valid_oplock_break(smb_buffer, server) &&
762 !isMultiRsp) {
763 cERROR(1, "No task to wake, unknown frame received! "
764 "NumMids %d", atomic_read(&midCount));
765 cifs_dump_mem("Received Data is: ", buf,
766 sizeof(struct smb_hdr));
767#ifdef CONFIG_CIFS_DEBUG2
768 cifs_dump_detail(smb_buffer);
769 cifs_dump_mids(server);
770#endif /* CIFS_DEBUG2 */
771
772 }
773 } /* end while !EXITING */
774
775 /* buffer usually freed in free_mid - need to free it here on exit */
776 cifs_buf_release(bigbuf);
777 if (smallbuf) /* no sense logging a debug message if NULL */
778 cifs_small_buf_release(smallbuf);
779
780 task_to_wake = xchg(&server->tsk, NULL);
781 clean_demultiplex_info(server);
782
783 /* if server->tsk was NULL then wait for a signal before exiting */
784 if (!task_to_wake) {
785 set_current_state(TASK_INTERRUPTIBLE);
786 while (!signal_pending(current)) {
787 schedule();
788 set_current_state(TASK_INTERRUPTIBLE);
789 }
790 set_current_state(TASK_RUNNING);
791 }
792
793 module_put_and_exit(0);
794}
795
796/* extract the host portion of the UNC string */
797static char *
798extract_hostname(const char *unc)
799{
800 const char *src;
801 char *dst, *delim;
802 unsigned int len;
803
804 /* skip double chars at beginning of string */
805 /* BB: check validity of these bytes? */
806 src = unc + 2;
807
808 /* delimiter between hostname and sharename is always '\\' now */
809 delim = strchr(src, '\\');
810 if (!delim)
811 return ERR_PTR(-EINVAL);
812
813 len = delim - src;
814 dst = kmalloc((len + 1), GFP_KERNEL);
815 if (dst == NULL)
816 return ERR_PTR(-ENOMEM);
817
818 memcpy(dst, src, len);
819 dst[len] = '\0';
820
821 return dst;
822}
823
824static int
825cifs_parse_mount_options(const char *mountdata, const char *devname,
826 struct smb_vol *vol)
827{
828 char *value, *data, *end;
829 char *mountdata_copy = NULL, *options;
830 unsigned int temp_len, i, j;
831 char separator[2];
832 short int override_uid = -1;
833 short int override_gid = -1;
834 bool uid_specified = false;
835 bool gid_specified = false;
836 char *nodename = utsname()->nodename;
837
838 separator[0] = ',';
839 separator[1] = 0;
840
841 /*
842 * does not have to be perfect mapping since field is
843 * informational, only used for servers that do not support
844 * port 445 and it can be overridden at mount time
845 */
846 memset(vol->source_rfc1001_name, 0x20, RFC1001_NAME_LEN);
847 for (i = 0; i < strnlen(nodename, RFC1001_NAME_LEN); i++)
848 vol->source_rfc1001_name[i] = toupper(nodename[i]);
849
850 vol->source_rfc1001_name[RFC1001_NAME_LEN] = 0;
851 /* null target name indicates to use *SMBSERVR default called name
852 if we end up sending RFC1001 session initialize */
853 vol->target_rfc1001_name[0] = 0;
854 vol->cred_uid = current_uid();
855 vol->linux_uid = current_uid();
856 vol->linux_gid = current_gid();
857
858 /* default to only allowing write access to owner of the mount */
859 vol->dir_mode = vol->file_mode = S_IRUGO | S_IXUGO | S_IWUSR;
860
861 /* vol->retry default is 0 (i.e. "soft" limited retry not hard retry) */
862 /* default is always to request posix paths. */
863 vol->posix_paths = 1;
864 /* default to using server inode numbers where available */
865 vol->server_ino = 1;
866
867 vol->actimeo = CIFS_DEF_ACTIMEO;
868
869 if (!mountdata)
870 goto cifs_parse_mount_err;
871
872 mountdata_copy = kstrndup(mountdata, PAGE_SIZE, GFP_KERNEL);
873 if (!mountdata_copy)
874 goto cifs_parse_mount_err;
875
876 options = mountdata_copy;
877 end = options + strlen(options);
878 if (strncmp(options, "sep=", 4) == 0) {
879 if (options[4] != 0) {
880 separator[0] = options[4];
881 options += 5;
882 } else {
883 cFYI(1, "Null separator not allowed");
884 }
885 }
886
887 while ((data = strsep(&options, separator)) != NULL) {
888 if (!*data)
889 continue;
890 if ((value = strchr(data, '=')) != NULL)
891 *value++ = '\0';
892
893 /* Have to parse this before we parse for "user" */
894 if (strnicmp(data, "user_xattr", 10) == 0) {
895 vol->no_xattr = 0;
896 } else if (strnicmp(data, "nouser_xattr", 12) == 0) {
897 vol->no_xattr = 1;
898 } else if (strnicmp(data, "user", 4) == 0) {
899 if (!value) {
900 printk(KERN_WARNING
901 "CIFS: invalid or missing username\n");
902 goto cifs_parse_mount_err;
903 } else if (!*value) {
904 /* null user, ie anonymous, authentication */
905 vol->nullauth = 1;
906 }
907 if (strnlen(value, MAX_USERNAME_SIZE) <
908 MAX_USERNAME_SIZE) {
909 vol->username = kstrdup(value, GFP_KERNEL);
910 if (!vol->username) {
911 printk(KERN_WARNING "CIFS: no memory "
912 "for username\n");
913 goto cifs_parse_mount_err;
914 }
915 } else {
916 printk(KERN_WARNING "CIFS: username too long\n");
917 goto cifs_parse_mount_err;
918 }
919 } else if (strnicmp(data, "pass", 4) == 0) {
920 if (!value) {
921 vol->password = NULL;
922 continue;
923 } else if (value[0] == 0) {
924 /* check if string begins with double comma
925 since that would mean the password really
926 does start with a comma, and would not
927 indicate an empty string */
928 if (value[1] != separator[0]) {
929 vol->password = NULL;
930 continue;
931 }
932 }
933 temp_len = strlen(value);
934 /* removed password length check, NTLM passwords
935 can be arbitrarily long */
936
937 /* if comma in password, the string will be
938 prematurely null terminated. Commas in password are
939 specified across the cifs mount interface by a double
940 comma ie ,, and a comma used as in other cases ie ','
941 as a parameter delimiter/separator is single and due
942 to the strsep above is temporarily zeroed. */
943
944 /* NB: password legally can have multiple commas and
945 the only illegal character in a password is null */
946
947 if ((value[temp_len] == 0) &&
948 (value + temp_len < end) &&
949 (value[temp_len+1] == separator[0])) {
950 /* reinsert comma */
951 value[temp_len] = separator[0];
952 temp_len += 2; /* move after second comma */
953 while (value[temp_len] != 0) {
954 if (value[temp_len] == separator[0]) {
955 if (value[temp_len+1] ==
956 separator[0]) {
957 /* skip second comma */
958 temp_len++;
959 } else {
960 /* single comma indicating start
961 of next parm */
962 break;
963 }
964 }
965 temp_len++;
966 }
967 if (value[temp_len] == 0) {
968 options = NULL;
969 } else {
970 value[temp_len] = 0;
971 /* point option to start of next parm */
972 options = value + temp_len + 1;
973 }
974 /* go from value to value + temp_len condensing
975 double commas to singles. Note that this ends up
976 allocating a few bytes too many, which is ok */
977 vol->password = kzalloc(temp_len, GFP_KERNEL);
978 if (vol->password == NULL) {
979 printk(KERN_WARNING "CIFS: no memory "
980 "for password\n");
981 goto cifs_parse_mount_err;
982 }
983 for (i = 0, j = 0; i < temp_len; i++, j++) {
984 vol->password[j] = value[i];
985 if (value[i] == separator[0]
986 && value[i+1] == separator[0]) {
987 /* skip second comma */
988 i++;
989 }
990 }
991 vol->password[j] = 0;
992 } else {
993 vol->password = kzalloc(temp_len+1, GFP_KERNEL);
994 if (vol->password == NULL) {
995 printk(KERN_WARNING "CIFS: no memory "
996 "for password\n");
997 goto cifs_parse_mount_err;
998 }
999 strcpy(vol->password, value);
1000 }
1001 } else if (!strnicmp(data, "ip", 2) ||
1002 !strnicmp(data, "addr", 4)) {
1003 if (!value || !*value) {
1004 vol->UNCip = NULL;
1005 } else if (strnlen(value, INET6_ADDRSTRLEN) <
1006 INET6_ADDRSTRLEN) {
1007 vol->UNCip = kstrdup(value, GFP_KERNEL);
1008 if (!vol->UNCip) {
1009 printk(KERN_WARNING "CIFS: no memory "
1010 "for UNC IP\n");
1011 goto cifs_parse_mount_err;
1012 }
1013 } else {
1014 printk(KERN_WARNING "CIFS: ip address "
1015 "too long\n");
1016 goto cifs_parse_mount_err;
1017 }
1018 } else if (strnicmp(data, "sec", 3) == 0) {
1019 if (!value || !*value) {
1020 cERROR(1, "no security value specified");
1021 continue;
1022 } else if (strnicmp(value, "krb5i", 5) == 0) {
1023 vol->secFlg |= CIFSSEC_MAY_KRB5 |
1024 CIFSSEC_MUST_SIGN;
1025 } else if (strnicmp(value, "krb5p", 5) == 0) {
1026 /* vol->secFlg |= CIFSSEC_MUST_SEAL |
1027 CIFSSEC_MAY_KRB5; */
1028 cERROR(1, "Krb5 cifs privacy not supported");
1029 goto cifs_parse_mount_err;
1030 } else if (strnicmp(value, "krb5", 4) == 0) {
1031 vol->secFlg |= CIFSSEC_MAY_KRB5;
1032 } else if (strnicmp(value, "ntlmsspi", 8) == 0) {
1033 vol->secFlg |= CIFSSEC_MAY_NTLMSSP |
1034 CIFSSEC_MUST_SIGN;
1035 } else if (strnicmp(value, "ntlmssp", 7) == 0) {
1036 vol->secFlg |= CIFSSEC_MAY_NTLMSSP;
1037 } else if (strnicmp(value, "ntlmv2i", 7) == 0) {
1038 vol->secFlg |= CIFSSEC_MAY_NTLMV2 |
1039 CIFSSEC_MUST_SIGN;
1040 } else if (strnicmp(value, "ntlmv2", 6) == 0) {
1041 vol->secFlg |= CIFSSEC_MAY_NTLMV2;
1042 } else if (strnicmp(value, "ntlmi", 5) == 0) {
1043 vol->secFlg |= CIFSSEC_MAY_NTLM |
1044 CIFSSEC_MUST_SIGN;
1045 } else if (strnicmp(value, "ntlm", 4) == 0) {
1046 /* ntlm is default so can be turned off too */
1047 vol->secFlg |= CIFSSEC_MAY_NTLM;
1048 } else if (strnicmp(value, "nontlm", 6) == 0) {
1049 /* BB is there a better way to do this? */
1050 vol->secFlg |= CIFSSEC_MAY_NTLMV2;
1051#ifdef CONFIG_CIFS_WEAK_PW_HASH
1052 } else if (strnicmp(value, "lanman", 6) == 0) {
1053 vol->secFlg |= CIFSSEC_MAY_LANMAN;
1054#endif
1055 } else if (strnicmp(value, "none", 4) == 0) {
1056 vol->nullauth = 1;
1057 } else {
1058 cERROR(1, "bad security option: %s", value);
1059 goto cifs_parse_mount_err;
1060 }
1061 } else if (strnicmp(data, "vers", 3) == 0) {
1062 if (!value || !*value) {
1063 cERROR(1, "no protocol version specified"
1064 " after vers= mount option");
1065 } else if ((strnicmp(value, "cifs", 4) == 0) ||
1066 (strnicmp(value, "1", 1) == 0)) {
1067 /* this is the default */
1068 continue;
1069 }
1070 } else if ((strnicmp(data, "unc", 3) == 0)
1071 || (strnicmp(data, "target", 6) == 0)
1072 || (strnicmp(data, "path", 4) == 0)) {
1073 if (!value || !*value) {
1074 printk(KERN_WARNING "CIFS: invalid path to "
1075 "network resource\n");
1076 goto cifs_parse_mount_err;
1077 }
1078 if ((temp_len = strnlen(value, 300)) < 300) {
1079 vol->UNC = kmalloc(temp_len+1, GFP_KERNEL);
1080 if (vol->UNC == NULL)
1081 goto cifs_parse_mount_err;
1082 strcpy(vol->UNC, value);
1083 if (strncmp(vol->UNC, "//", 2) == 0) {
1084 vol->UNC[0] = '\\';
1085 vol->UNC[1] = '\\';
1086 } else if (strncmp(vol->UNC, "\\\\", 2) != 0) {
1087 printk(KERN_WARNING
1088 "CIFS: UNC Path does not begin "
1089 "with // or \\\\ \n");
1090 goto cifs_parse_mount_err;
1091 }
1092 } else {
1093 printk(KERN_WARNING "CIFS: UNC name too long\n");
1094 goto cifs_parse_mount_err;
1095 }
1096 } else if ((strnicmp(data, "domain", 3) == 0)
1097 || (strnicmp(data, "workgroup", 5) == 0)) {
1098 if (!value || !*value) {
1099 printk(KERN_WARNING "CIFS: invalid domain name\n");
1100 goto cifs_parse_mount_err;
1101 }
1102 /* BB are there cases in which a comma can be valid in
1103 a domain name and need special handling? */
1104 if (strnlen(value, 256) < 256) {
1105 vol->domainname = kstrdup(value, GFP_KERNEL);
1106 if (!vol->domainname) {
1107 printk(KERN_WARNING "CIFS: no memory "
1108 "for domainname\n");
1109 goto cifs_parse_mount_err;
1110 }
1111 cFYI(1, "Domain name set");
1112 } else {
1113 printk(KERN_WARNING "CIFS: domain name too "
1114 "long\n");
1115 goto cifs_parse_mount_err;
1116 }
1117 } else if (strnicmp(data, "srcaddr", 7) == 0) {
1118 vol->srcaddr.ss_family = AF_UNSPEC;
1119
1120 if (!value || !*value) {
1121 printk(KERN_WARNING "CIFS: srcaddr value"
1122 " not specified.\n");
1123 goto cifs_parse_mount_err;
1124 }
1125 i = cifs_convert_address((struct sockaddr *)&vol->srcaddr,
1126 value, strlen(value));
1127 if (i == 0) {
1128 printk(KERN_WARNING "CIFS: Could not parse"
1129 " srcaddr: %s\n",
1130 value);
1131 goto cifs_parse_mount_err;
1132 }
1133 } else if (strnicmp(data, "prefixpath", 10) == 0) {
1134 if (!value || !*value) {
1135 printk(KERN_WARNING
1136 "CIFS: invalid path prefix\n");
1137 goto cifs_parse_mount_err;
1138 }
1139 if ((temp_len = strnlen(value, 1024)) < 1024) {
1140 if (value[0] != '/')
1141 temp_len++; /* missing leading slash */
1142 vol->prepath = kmalloc(temp_len+1, GFP_KERNEL);
1143 if (vol->prepath == NULL)
1144 goto cifs_parse_mount_err;
1145 if (value[0] != '/') {
1146 vol->prepath[0] = '/';
1147 strcpy(vol->prepath+1, value);
1148 } else
1149 strcpy(vol->prepath, value);
1150 cFYI(1, "prefix path %s", vol->prepath);
1151 } else {
1152 printk(KERN_WARNING "CIFS: prefix too long\n");
1153 goto cifs_parse_mount_err;
1154 }
1155 } else if (strnicmp(data, "iocharset", 9) == 0) {
1156 if (!value || !*value) {
1157 printk(KERN_WARNING "CIFS: invalid iocharset "
1158 "specified\n");
1159 goto cifs_parse_mount_err;
1160 }
1161 if (strnlen(value, 65) < 65) {
1162 if (strnicmp(value, "default", 7)) {
1163 vol->iocharset = kstrdup(value,
1164 GFP_KERNEL);
1165
1166 if (!vol->iocharset) {
1167 printk(KERN_WARNING "CIFS: no "
1168 "memory for"
1169 "charset\n");
1170 goto cifs_parse_mount_err;
1171 }
1172 }
1173 /* if iocharset not set then load_nls_default
1174 is used by caller */
1175 cFYI(1, "iocharset set to %s", value);
1176 } else {
1177 printk(KERN_WARNING "CIFS: iocharset name "
1178 "too long.\n");
1179 goto cifs_parse_mount_err;
1180 }
1181 } else if (!strnicmp(data, "uid", 3) && value && *value) {
1182 vol->linux_uid = simple_strtoul(value, &value, 0);
1183 uid_specified = true;
1184 } else if (!strnicmp(data, "cruid", 5) && value && *value) {
1185 vol->cred_uid = simple_strtoul(value, &value, 0);
1186 } else if (!strnicmp(data, "forceuid", 8)) {
1187 override_uid = 1;
1188 } else if (!strnicmp(data, "noforceuid", 10)) {
1189 override_uid = 0;
1190 } else if (!strnicmp(data, "gid", 3) && value && *value) {
1191 vol->linux_gid = simple_strtoul(value, &value, 0);
1192 gid_specified = true;
1193 } else if (!strnicmp(data, "forcegid", 8)) {
1194 override_gid = 1;
1195 } else if (!strnicmp(data, "noforcegid", 10)) {
1196 override_gid = 0;
1197 } else if (strnicmp(data, "file_mode", 4) == 0) {
1198 if (value && *value) {
1199 vol->file_mode =
1200 simple_strtoul(value, &value, 0);
1201 }
1202 } else if (strnicmp(data, "dir_mode", 4) == 0) {
1203 if (value && *value) {
1204 vol->dir_mode =
1205 simple_strtoul(value, &value, 0);
1206 }
1207 } else if (strnicmp(data, "dirmode", 4) == 0) {
1208 if (value && *value) {
1209 vol->dir_mode =
1210 simple_strtoul(value, &value, 0);
1211 }
1212 } else if (strnicmp(data, "port", 4) == 0) {
1213 if (value && *value) {
1214 vol->port =
1215 simple_strtoul(value, &value, 0);
1216 }
1217 } else if (strnicmp(data, "rsize", 5) == 0) {
1218 if (value && *value) {
1219 vol->rsize =
1220 simple_strtoul(value, &value, 0);
1221 }
1222 } else if (strnicmp(data, "wsize", 5) == 0) {
1223 if (value && *value) {
1224 vol->wsize =
1225 simple_strtoul(value, &value, 0);
1226 }
1227 } else if (strnicmp(data, "sockopt", 5) == 0) {
1228 if (!value || !*value) {
1229 cERROR(1, "no socket option specified");
1230 continue;
1231 } else if (strnicmp(value, "TCP_NODELAY", 11) == 0) {
1232 vol->sockopt_tcp_nodelay = 1;
1233 }
1234 } else if (strnicmp(data, "netbiosname", 4) == 0) {
1235 if (!value || !*value || (*value == ' ')) {
1236 cFYI(1, "invalid (empty) netbiosname");
1237 } else {
1238 memset(vol->source_rfc1001_name, 0x20,
1239 RFC1001_NAME_LEN);
1240 /*
1241 * FIXME: are there cases in which a comma can
1242 * be valid in workstation netbios name (and
1243 * need special handling)?
1244 */
1245 for (i = 0; i < RFC1001_NAME_LEN; i++) {
1246 /* don't ucase netbiosname for user */
1247 if (value[i] == 0)
1248 break;
1249 vol->source_rfc1001_name[i] = value[i];
1250 }
1251 /* The string has 16th byte zero still from
1252 set at top of the function */
1253 if (i == RFC1001_NAME_LEN && value[i] != 0)
1254 printk(KERN_WARNING "CIFS: netbiosname"
1255 " longer than 15 truncated.\n");
1256 }
1257 } else if (strnicmp(data, "servern", 7) == 0) {
1258 /* servernetbiosname specified override *SMBSERVER */
1259 if (!value || !*value || (*value == ' ')) {
1260 cFYI(1, "empty server netbiosname specified");
1261 } else {
1262 /* last byte, type, is 0x20 for servr type */
1263 memset(vol->target_rfc1001_name, 0x20,
1264 RFC1001_NAME_LEN_WITH_NULL);
1265
1266 for (i = 0; i < 15; i++) {
1267 /* BB are there cases in which a comma can be
1268 valid in this workstation netbios name
1269 (and need special handling)? */
1270
1271 /* user or mount helper must uppercase
1272 the netbiosname */
1273 if (value[i] == 0)
1274 break;
1275 else
1276 vol->target_rfc1001_name[i] =
1277 value[i];
1278 }
1279 /* The string has 16th byte zero still from
1280 set at top of the function */
1281 if (i == RFC1001_NAME_LEN && value[i] != 0)
1282 printk(KERN_WARNING "CIFS: server net"
1283 "biosname longer than 15 truncated.\n");
1284 }
1285 } else if (strnicmp(data, "actimeo", 7) == 0) {
1286 if (value && *value) {
1287 vol->actimeo = HZ * simple_strtoul(value,
1288 &value, 0);
1289 if (vol->actimeo > CIFS_MAX_ACTIMEO) {
1290 cERROR(1, "CIFS: attribute cache"
1291 "timeout too large");
1292 goto cifs_parse_mount_err;
1293 }
1294 }
1295 } else if (strnicmp(data, "credentials", 4) == 0) {
1296 /* ignore */
1297 } else if (strnicmp(data, "version", 3) == 0) {
1298 /* ignore */
1299 } else if (strnicmp(data, "guest", 5) == 0) {
1300 /* ignore */
1301 } else if (strnicmp(data, "rw", 2) == 0 && strlen(data) == 2) {
1302 /* ignore */
1303 } else if (strnicmp(data, "ro", 2) == 0) {
1304 /* ignore */
1305 } else if (strnicmp(data, "noblocksend", 11) == 0) {
1306 vol->noblocksnd = 1;
1307 } else if (strnicmp(data, "noautotune", 10) == 0) {
1308 vol->noautotune = 1;
1309 } else if ((strnicmp(data, "suid", 4) == 0) ||
1310 (strnicmp(data, "nosuid", 6) == 0) ||
1311 (strnicmp(data, "exec", 4) == 0) ||
1312 (strnicmp(data, "noexec", 6) == 0) ||
1313 (strnicmp(data, "nodev", 5) == 0) ||
1314 (strnicmp(data, "noauto", 6) == 0) ||
1315 (strnicmp(data, "dev", 3) == 0)) {
1316 /* The mount tool or mount.cifs helper (if present)
1317 uses these opts to set flags, and the flags are read
1318 by the kernel vfs layer before we get here (ie
1319 before read super) so there is no point trying to
1320 parse these options again and set anything and it
1321 is ok to just ignore them */
1322 continue;
1323 } else if (strnicmp(data, "hard", 4) == 0) {
1324 vol->retry = 1;
1325 } else if (strnicmp(data, "soft", 4) == 0) {
1326 vol->retry = 0;
1327 } else if (strnicmp(data, "perm", 4) == 0) {
1328 vol->noperm = 0;
1329 } else if (strnicmp(data, "noperm", 6) == 0) {
1330 vol->noperm = 1;
1331 } else if (strnicmp(data, "mapchars", 8) == 0) {
1332 vol->remap = 1;
1333 } else if (strnicmp(data, "nomapchars", 10) == 0) {
1334 vol->remap = 0;
1335 } else if (strnicmp(data, "sfu", 3) == 0) {
1336 vol->sfu_emul = 1;
1337 } else if (strnicmp(data, "nosfu", 5) == 0) {
1338 vol->sfu_emul = 0;
1339 } else if (strnicmp(data, "nodfs", 5) == 0) {
1340 vol->nodfs = 1;
1341 } else if (strnicmp(data, "posixpaths", 10) == 0) {
1342 vol->posix_paths = 1;
1343 } else if (strnicmp(data, "noposixpaths", 12) == 0) {
1344 vol->posix_paths = 0;
1345 } else if (strnicmp(data, "nounix", 6) == 0) {
1346 vol->no_linux_ext = 1;
1347 } else if (strnicmp(data, "nolinux", 7) == 0) {
1348 vol->no_linux_ext = 1;
1349 } else if ((strnicmp(data, "nocase", 6) == 0) ||
1350 (strnicmp(data, "ignorecase", 10) == 0)) {
1351 vol->nocase = 1;
1352 } else if (strnicmp(data, "mand", 4) == 0) {
1353 /* ignore */
1354 } else if (strnicmp(data, "nomand", 6) == 0) {
1355 /* ignore */
1356 } else if (strnicmp(data, "_netdev", 7) == 0) {
1357 /* ignore */
1358 } else if (strnicmp(data, "brl", 3) == 0) {
1359 vol->nobrl = 0;
1360 } else if ((strnicmp(data, "nobrl", 5) == 0) ||
1361 (strnicmp(data, "nolock", 6) == 0)) {
1362 vol->nobrl = 1;
1363 /* turn off mandatory locking in mode
1364 if remote locking is turned off since the
1365 local vfs will do advisory */
1366 if (vol->file_mode ==
1367 (S_IALLUGO & ~(S_ISUID | S_IXGRP)))
1368 vol->file_mode = S_IALLUGO;
1369 } else if (strnicmp(data, "forcemandatorylock", 9) == 0) {
1370 /* will take the shorter form "forcemand" as well */
1371 /* This mount option will force use of mandatory
1372 (DOS/Windows style) byte range locks, instead of
1373 using posix advisory byte range locks, even if the
1374 Unix extensions are available and posix locks would
1375 be supported otherwise. If Unix extensions are not
1376 negotiated this has no effect since mandatory locks
1377 would be used (mandatory locks is all that those
1378 those servers support) */
1379 vol->mand_lock = 1;
1380 } else if (strnicmp(data, "setuids", 7) == 0) {
1381 vol->setuids = 1;
1382 } else if (strnicmp(data, "nosetuids", 9) == 0) {
1383 vol->setuids = 0;
1384 } else if (strnicmp(data, "dynperm", 7) == 0) {
1385 vol->dynperm = true;
1386 } else if (strnicmp(data, "nodynperm", 9) == 0) {
1387 vol->dynperm = false;
1388 } else if (strnicmp(data, "nohard", 6) == 0) {
1389 vol->retry = 0;
1390 } else if (strnicmp(data, "nosoft", 6) == 0) {
1391 vol->retry = 1;
1392 } else if (strnicmp(data, "nointr", 6) == 0) {
1393 vol->intr = 0;
1394 } else if (strnicmp(data, "intr", 4) == 0) {
1395 vol->intr = 1;
1396 } else if (strnicmp(data, "nostrictsync", 12) == 0) {
1397 vol->nostrictsync = 1;
1398 } else if (strnicmp(data, "strictsync", 10) == 0) {
1399 vol->nostrictsync = 0;
1400 } else if (strnicmp(data, "serverino", 7) == 0) {
1401 vol->server_ino = 1;
1402 } else if (strnicmp(data, "noserverino", 9) == 0) {
1403 vol->server_ino = 0;
1404 } else if (strnicmp(data, "rwpidforward", 12) == 0) {
1405 vol->rwpidforward = 1;
1406 } else if (strnicmp(data, "cifsacl", 7) == 0) {
1407 vol->cifs_acl = 1;
1408 } else if (strnicmp(data, "nocifsacl", 9) == 0) {
1409 vol->cifs_acl = 0;
1410 } else if (strnicmp(data, "acl", 3) == 0) {
1411 vol->no_psx_acl = 0;
1412 } else if (strnicmp(data, "noacl", 5) == 0) {
1413 vol->no_psx_acl = 1;
1414 } else if (strnicmp(data, "locallease", 6) == 0) {
1415 vol->local_lease = 1;
1416 } else if (strnicmp(data, "sign", 4) == 0) {
1417 vol->secFlg |= CIFSSEC_MUST_SIGN;
1418 } else if (strnicmp(data, "seal", 4) == 0) {
1419 /* we do not do the following in secFlags because seal
1420 is a per tree connection (mount) not a per socket
1421 or per-smb connection option in the protocol */
1422 /* vol->secFlg |= CIFSSEC_MUST_SEAL; */
1423 vol->seal = 1;
1424 } else if (strnicmp(data, "direct", 6) == 0) {
1425 vol->direct_io = 1;
1426 } else if (strnicmp(data, "forcedirectio", 13) == 0) {
1427 vol->direct_io = 1;
1428 } else if (strnicmp(data, "strictcache", 11) == 0) {
1429 vol->strict_io = 1;
1430 } else if (strnicmp(data, "noac", 4) == 0) {
1431 printk(KERN_WARNING "CIFS: Mount option noac not "
1432 "supported. Instead set "
1433 "/proc/fs/cifs/LookupCacheEnabled to 0\n");
1434 } else if (strnicmp(data, "fsc", 3) == 0) {
1435#ifndef CONFIG_CIFS_FSCACHE
1436 cERROR(1, "FS-Cache support needs CONFIG_CIFS_FSCACHE "
1437 "kernel config option set");
1438 goto cifs_parse_mount_err;
1439#endif
1440 vol->fsc = true;
1441 } else if (strnicmp(data, "mfsymlinks", 10) == 0) {
1442 vol->mfsymlinks = true;
1443 } else if (strnicmp(data, "multiuser", 8) == 0) {
1444 vol->multiuser = true;
1445 } else
1446 printk(KERN_WARNING "CIFS: Unknown mount option %s\n",
1447 data);
1448 }
1449 if (vol->UNC == NULL) {
1450 if (devname == NULL) {
1451 printk(KERN_WARNING "CIFS: Missing UNC name for mount "
1452 "target\n");
1453 goto cifs_parse_mount_err;
1454 }
1455 if ((temp_len = strnlen(devname, 300)) < 300) {
1456 vol->UNC = kmalloc(temp_len+1, GFP_KERNEL);
1457 if (vol->UNC == NULL)
1458 goto cifs_parse_mount_err;
1459 strcpy(vol->UNC, devname);
1460 if (strncmp(vol->UNC, "//", 2) == 0) {
1461 vol->UNC[0] = '\\';
1462 vol->UNC[1] = '\\';
1463 } else if (strncmp(vol->UNC, "\\\\", 2) != 0) {
1464 printk(KERN_WARNING "CIFS: UNC Path does not "
1465 "begin with // or \\\\ \n");
1466 goto cifs_parse_mount_err;
1467 }
1468 value = strpbrk(vol->UNC+2, "/\\");
1469 if (value)
1470 *value = '\\';
1471 } else {
1472 printk(KERN_WARNING "CIFS: UNC name too long\n");
1473 goto cifs_parse_mount_err;
1474 }
1475 }
1476
1477 if (vol->multiuser && !(vol->secFlg & CIFSSEC_MAY_KRB5)) {
1478 cERROR(1, "Multiuser mounts currently require krb5 "
1479 "authentication!");
1480 goto cifs_parse_mount_err;
1481 }
1482
1483 if (vol->UNCip == NULL)
1484 vol->UNCip = &vol->UNC[2];
1485
1486 if (uid_specified)
1487 vol->override_uid = override_uid;
1488 else if (override_uid == 1)
1489 printk(KERN_NOTICE "CIFS: ignoring forceuid mount option "
1490 "specified with no uid= option.\n");
1491
1492 if (gid_specified)
1493 vol->override_gid = override_gid;
1494 else if (override_gid == 1)
1495 printk(KERN_NOTICE "CIFS: ignoring forcegid mount option "
1496 "specified with no gid= option.\n");
1497
1498 kfree(mountdata_copy);
1499 return 0;
1500
1501cifs_parse_mount_err:
1502 kfree(mountdata_copy);
1503 return 1;
1504}
1505
1506/** Returns true if srcaddr isn't specified and rhs isn't
1507 * specified, or if srcaddr is specified and
1508 * matches the IP address of the rhs argument.
1509 */
1510static bool
1511srcip_matches(struct sockaddr *srcaddr, struct sockaddr *rhs)
1512{
1513 switch (srcaddr->sa_family) {
1514 case AF_UNSPEC:
1515 return (rhs->sa_family == AF_UNSPEC);
1516 case AF_INET: {
1517 struct sockaddr_in *saddr4 = (struct sockaddr_in *)srcaddr;
1518 struct sockaddr_in *vaddr4 = (struct sockaddr_in *)rhs;
1519 return (saddr4->sin_addr.s_addr == vaddr4->sin_addr.s_addr);
1520 }
1521 case AF_INET6: {
1522 struct sockaddr_in6 *saddr6 = (struct sockaddr_in6 *)srcaddr;
1523 struct sockaddr_in6 *vaddr6 = (struct sockaddr_in6 *)&rhs;
1524 return ipv6_addr_equal(&saddr6->sin6_addr, &vaddr6->sin6_addr);
1525 }
1526 default:
1527 WARN_ON(1);
1528 return false; /* don't expect to be here */
1529 }
1530}
1531
1532/*
1533 * If no port is specified in addr structure, we try to match with 445 port
1534 * and if it fails - with 139 ports. It should be called only if address
1535 * families of server and addr are equal.
1536 */
1537static bool
1538match_port(struct TCP_Server_Info *server, struct sockaddr *addr)
1539{
1540 __be16 port, *sport;
1541
1542 switch (addr->sa_family) {
1543 case AF_INET:
1544 sport = &((struct sockaddr_in *) &server->dstaddr)->sin_port;
1545 port = ((struct sockaddr_in *) addr)->sin_port;
1546 break;
1547 case AF_INET6:
1548 sport = &((struct sockaddr_in6 *) &server->dstaddr)->sin6_port;
1549 port = ((struct sockaddr_in6 *) addr)->sin6_port;
1550 break;
1551 default:
1552 WARN_ON(1);
1553 return false;
1554 }
1555
1556 if (!port) {
1557 port = htons(CIFS_PORT);
1558 if (port == *sport)
1559 return true;
1560
1561 port = htons(RFC1001_PORT);
1562 }
1563
1564 return port == *sport;
1565}
1566
1567static bool
1568match_address(struct TCP_Server_Info *server, struct sockaddr *addr,
1569 struct sockaddr *srcaddr)
1570{
1571 switch (addr->sa_family) {
1572 case AF_INET: {
1573 struct sockaddr_in *addr4 = (struct sockaddr_in *)addr;
1574 struct sockaddr_in *srv_addr4 =
1575 (struct sockaddr_in *)&server->dstaddr;
1576
1577 if (addr4->sin_addr.s_addr != srv_addr4->sin_addr.s_addr)
1578 return false;
1579 break;
1580 }
1581 case AF_INET6: {
1582 struct sockaddr_in6 *addr6 = (struct sockaddr_in6 *)addr;
1583 struct sockaddr_in6 *srv_addr6 =
1584 (struct sockaddr_in6 *)&server->dstaddr;
1585
1586 if (!ipv6_addr_equal(&addr6->sin6_addr,
1587 &srv_addr6->sin6_addr))
1588 return false;
1589 if (addr6->sin6_scope_id != srv_addr6->sin6_scope_id)
1590 return false;
1591 break;
1592 }
1593 default:
1594 WARN_ON(1);
1595 return false; /* don't expect to be here */
1596 }
1597
1598 if (!srcip_matches(srcaddr, (struct sockaddr *)&server->srcaddr))
1599 return false;
1600
1601 return true;
1602}
1603
1604static bool
1605match_security(struct TCP_Server_Info *server, struct smb_vol *vol)
1606{
1607 unsigned int secFlags;
1608
1609 if (vol->secFlg & (~(CIFSSEC_MUST_SIGN | CIFSSEC_MUST_SEAL)))
1610 secFlags = vol->secFlg;
1611 else
1612 secFlags = global_secflags | vol->secFlg;
1613
1614 switch (server->secType) {
1615 case LANMAN:
1616 if (!(secFlags & (CIFSSEC_MAY_LANMAN|CIFSSEC_MAY_PLNTXT)))
1617 return false;
1618 break;
1619 case NTLMv2:
1620 if (!(secFlags & CIFSSEC_MAY_NTLMV2))
1621 return false;
1622 break;
1623 case NTLM:
1624 if (!(secFlags & CIFSSEC_MAY_NTLM))
1625 return false;
1626 break;
1627 case Kerberos:
1628 if (!(secFlags & CIFSSEC_MAY_KRB5))
1629 return false;
1630 break;
1631 case RawNTLMSSP:
1632 if (!(secFlags & CIFSSEC_MAY_NTLMSSP))
1633 return false;
1634 break;
1635 default:
1636 /* shouldn't happen */
1637 return false;
1638 }
1639
1640 /* now check if signing mode is acceptable */
1641 if ((secFlags & CIFSSEC_MAY_SIGN) == 0 &&
1642 (server->sec_mode & SECMODE_SIGN_REQUIRED))
1643 return false;
1644 else if (((secFlags & CIFSSEC_MUST_SIGN) == CIFSSEC_MUST_SIGN) &&
1645 (server->sec_mode &
1646 (SECMODE_SIGN_ENABLED|SECMODE_SIGN_REQUIRED)) == 0)
1647 return false;
1648
1649 return true;
1650}
1651
1652static int match_server(struct TCP_Server_Info *server, struct sockaddr *addr,
1653 struct smb_vol *vol)
1654{
1655 if (!net_eq(cifs_net_ns(server), current->nsproxy->net_ns))
1656 return 0;
1657
1658 if (!match_address(server, addr,
1659 (struct sockaddr *)&vol->srcaddr))
1660 return 0;
1661
1662 if (!match_port(server, addr))
1663 return 0;
1664
1665 if (!match_security(server, vol))
1666 return 0;
1667
1668 return 1;
1669}
1670
1671static struct TCP_Server_Info *
1672cifs_find_tcp_session(struct sockaddr *addr, struct smb_vol *vol)
1673{
1674 struct TCP_Server_Info *server;
1675
1676 spin_lock(&cifs_tcp_ses_lock);
1677 list_for_each_entry(server, &cifs_tcp_ses_list, tcp_ses_list) {
1678 if (!match_server(server, addr, vol))
1679 continue;
1680
1681 ++server->srv_count;
1682 spin_unlock(&cifs_tcp_ses_lock);
1683 cFYI(1, "Existing tcp session with server found");
1684 return server;
1685 }
1686 spin_unlock(&cifs_tcp_ses_lock);
1687 return NULL;
1688}
1689
1690static void
1691cifs_put_tcp_session(struct TCP_Server_Info *server)
1692{
1693 struct task_struct *task;
1694
1695 spin_lock(&cifs_tcp_ses_lock);
1696 if (--server->srv_count > 0) {
1697 spin_unlock(&cifs_tcp_ses_lock);
1698 return;
1699 }
1700
1701 put_net(cifs_net_ns(server));
1702
1703 list_del_init(&server->tcp_ses_list);
1704 spin_unlock(&cifs_tcp_ses_lock);
1705
1706 cancel_delayed_work_sync(&server->echo);
1707
1708 spin_lock(&GlobalMid_Lock);
1709 server->tcpStatus = CifsExiting;
1710 spin_unlock(&GlobalMid_Lock);
1711
1712 cifs_crypto_shash_release(server);
1713 cifs_fscache_release_client_cookie(server);
1714
1715 kfree(server->session_key.response);
1716 server->session_key.response = NULL;
1717 server->session_key.len = 0;
1718
1719 task = xchg(&server->tsk, NULL);
1720 if (task)
1721 force_sig(SIGKILL, task);
1722}
1723
1724static struct TCP_Server_Info *
1725cifs_get_tcp_session(struct smb_vol *volume_info)
1726{
1727 struct TCP_Server_Info *tcp_ses = NULL;
1728 struct sockaddr_storage addr;
1729 struct sockaddr_in *sin_server = (struct sockaddr_in *) &addr;
1730 struct sockaddr_in6 *sin_server6 = (struct sockaddr_in6 *) &addr;
1731 int rc;
1732
1733 memset(&addr, 0, sizeof(struct sockaddr_storage));
1734
1735 cFYI(1, "UNC: %s ip: %s", volume_info->UNC, volume_info->UNCip);
1736
1737 if (volume_info->UNCip && volume_info->UNC) {
1738 rc = cifs_fill_sockaddr((struct sockaddr *)&addr,
1739 volume_info->UNCip,
1740 strlen(volume_info->UNCip),
1741 volume_info->port);
1742 if (!rc) {
1743 /* we failed translating address */
1744 rc = -EINVAL;
1745 goto out_err;
1746 }
1747 } else if (volume_info->UNCip) {
1748 /* BB using ip addr as tcp_ses name to connect to the
1749 DFS root below */
1750 cERROR(1, "Connecting to DFS root not implemented yet");
1751 rc = -EINVAL;
1752 goto out_err;
1753 } else /* which tcp_sess DFS root would we conect to */ {
1754 cERROR(1, "CIFS mount error: No UNC path (e.g. -o "
1755 "unc=//192.168.1.100/public) specified");
1756 rc = -EINVAL;
1757 goto out_err;
1758 }
1759
1760 /* see if we already have a matching tcp_ses */
1761 tcp_ses = cifs_find_tcp_session((struct sockaddr *)&addr, volume_info);
1762 if (tcp_ses)
1763 return tcp_ses;
1764
1765 tcp_ses = kzalloc(sizeof(struct TCP_Server_Info), GFP_KERNEL);
1766 if (!tcp_ses) {
1767 rc = -ENOMEM;
1768 goto out_err;
1769 }
1770
1771 rc = cifs_crypto_shash_allocate(tcp_ses);
1772 if (rc) {
1773 cERROR(1, "could not setup hash structures rc %d", rc);
1774 goto out_err;
1775 }
1776
1777 cifs_set_net_ns(tcp_ses, get_net(current->nsproxy->net_ns));
1778 tcp_ses->hostname = extract_hostname(volume_info->UNC);
1779 if (IS_ERR(tcp_ses->hostname)) {
1780 rc = PTR_ERR(tcp_ses->hostname);
1781 goto out_err_crypto_release;
1782 }
1783
1784 tcp_ses->noblocksnd = volume_info->noblocksnd;
1785 tcp_ses->noautotune = volume_info->noautotune;
1786 tcp_ses->tcp_nodelay = volume_info->sockopt_tcp_nodelay;
1787 atomic_set(&tcp_ses->inFlight, 0);
1788 init_waitqueue_head(&tcp_ses->response_q);
1789 init_waitqueue_head(&tcp_ses->request_q);
1790 INIT_LIST_HEAD(&tcp_ses->pending_mid_q);
1791 mutex_init(&tcp_ses->srv_mutex);
1792 memcpy(tcp_ses->workstation_RFC1001_name,
1793 volume_info->source_rfc1001_name, RFC1001_NAME_LEN_WITH_NULL);
1794 memcpy(tcp_ses->server_RFC1001_name,
1795 volume_info->target_rfc1001_name, RFC1001_NAME_LEN_WITH_NULL);
1796 tcp_ses->session_estab = false;
1797 tcp_ses->sequence_number = 0;
1798 tcp_ses->lstrp = jiffies;
1799 INIT_LIST_HEAD(&tcp_ses->tcp_ses_list);
1800 INIT_LIST_HEAD(&tcp_ses->smb_ses_list);
1801 INIT_DELAYED_WORK(&tcp_ses->echo, cifs_echo_request);
1802
1803 /*
1804 * at this point we are the only ones with the pointer
1805 * to the struct since the kernel thread not created yet
1806 * no need to spinlock this init of tcpStatus or srv_count
1807 */
1808 tcp_ses->tcpStatus = CifsNew;
1809 memcpy(&tcp_ses->srcaddr, &volume_info->srcaddr,
1810 sizeof(tcp_ses->srcaddr));
1811 ++tcp_ses->srv_count;
1812
1813 if (addr.ss_family == AF_INET6) {
1814 cFYI(1, "attempting ipv6 connect");
1815 /* BB should we allow ipv6 on port 139? */
1816 /* other OS never observed in Wild doing 139 with v6 */
1817 memcpy(&tcp_ses->dstaddr, sin_server6,
1818 sizeof(struct sockaddr_in6));
1819 } else
1820 memcpy(&tcp_ses->dstaddr, sin_server,
1821 sizeof(struct sockaddr_in));
1822
1823 rc = ip_connect(tcp_ses);
1824 if (rc < 0) {
1825 cERROR(1, "Error connecting to socket. Aborting operation");
1826 goto out_err_crypto_release;
1827 }
1828
1829 /*
1830 * since we're in a cifs function already, we know that
1831 * this will succeed. No need for try_module_get().
1832 */
1833 __module_get(THIS_MODULE);
1834 tcp_ses->tsk = kthread_run(cifs_demultiplex_thread,
1835 tcp_ses, "cifsd");
1836 if (IS_ERR(tcp_ses->tsk)) {
1837 rc = PTR_ERR(tcp_ses->tsk);
1838 cERROR(1, "error %d create cifsd thread", rc);
1839 module_put(THIS_MODULE);
1840 goto out_err_crypto_release;
1841 }
1842 tcp_ses->tcpStatus = CifsNeedNegotiate;
1843
1844 /* thread spawned, put it on the list */
1845 spin_lock(&cifs_tcp_ses_lock);
1846 list_add(&tcp_ses->tcp_ses_list, &cifs_tcp_ses_list);
1847 spin_unlock(&cifs_tcp_ses_lock);
1848
1849 cifs_fscache_get_client_cookie(tcp_ses);
1850
1851 /* queue echo request delayed work */
1852 queue_delayed_work(system_nrt_wq, &tcp_ses->echo, SMB_ECHO_INTERVAL);
1853
1854 return tcp_ses;
1855
1856out_err_crypto_release:
1857 cifs_crypto_shash_release(tcp_ses);
1858
1859 put_net(cifs_net_ns(tcp_ses));
1860
1861out_err:
1862 if (tcp_ses) {
1863 if (!IS_ERR(tcp_ses->hostname))
1864 kfree(tcp_ses->hostname);
1865 if (tcp_ses->ssocket)
1866 sock_release(tcp_ses->ssocket);
1867 kfree(tcp_ses);
1868 }
1869 return ERR_PTR(rc);
1870}
1871
1872static int match_session(struct cifs_ses *ses, struct smb_vol *vol)
1873{
1874 switch (ses->server->secType) {
1875 case Kerberos:
1876 if (vol->cred_uid != ses->cred_uid)
1877 return 0;
1878 break;
1879 default:
1880 /* anything else takes username/password */
1881 if (ses->user_name == NULL)
1882 return 0;
1883 if (strncmp(ses->user_name, vol->username,
1884 MAX_USERNAME_SIZE))
1885 return 0;
1886 if (strlen(vol->username) != 0 &&
1887 ses->password != NULL &&
1888 strncmp(ses->password,
1889 vol->password ? vol->password : "",
1890 MAX_PASSWORD_SIZE))
1891 return 0;
1892 }
1893 return 1;
1894}
1895
1896static struct cifs_ses *
1897cifs_find_smb_ses(struct TCP_Server_Info *server, struct smb_vol *vol)
1898{
1899 struct cifs_ses *ses;
1900
1901 spin_lock(&cifs_tcp_ses_lock);
1902 list_for_each_entry(ses, &server->smb_ses_list, smb_ses_list) {
1903 if (!match_session(ses, vol))
1904 continue;
1905 ++ses->ses_count;
1906 spin_unlock(&cifs_tcp_ses_lock);
1907 return ses;
1908 }
1909 spin_unlock(&cifs_tcp_ses_lock);
1910 return NULL;
1911}
1912
1913static void
1914cifs_put_smb_ses(struct cifs_ses *ses)
1915{
1916 int xid;
1917 struct TCP_Server_Info *server = ses->server;
1918
1919 cFYI(1, "%s: ses_count=%d\n", __func__, ses->ses_count);
1920 spin_lock(&cifs_tcp_ses_lock);
1921 if (--ses->ses_count > 0) {
1922 spin_unlock(&cifs_tcp_ses_lock);
1923 return;
1924 }
1925
1926 list_del_init(&ses->smb_ses_list);
1927 spin_unlock(&cifs_tcp_ses_lock);
1928
1929 if (ses->status == CifsGood) {
1930 xid = GetXid();
1931 CIFSSMBLogoff(xid, ses);
1932 _FreeXid(xid);
1933 }
1934 sesInfoFree(ses);
1935 cifs_put_tcp_session(server);
1936}
1937
1938static bool warned_on_ntlm; /* globals init to false automatically */
1939
1940static struct cifs_ses *
1941cifs_get_smb_ses(struct TCP_Server_Info *server, struct smb_vol *volume_info)
1942{
1943 int rc = -ENOMEM, xid;
1944 struct cifs_ses *ses;
1945 struct sockaddr_in *addr = (struct sockaddr_in *)&server->dstaddr;
1946 struct sockaddr_in6 *addr6 = (struct sockaddr_in6 *)&server->dstaddr;
1947
1948 xid = GetXid();
1949
1950 ses = cifs_find_smb_ses(server, volume_info);
1951 if (ses) {
1952 cFYI(1, "Existing smb sess found (status=%d)", ses->status);
1953
1954 mutex_lock(&ses->session_mutex);
1955 rc = cifs_negotiate_protocol(xid, ses);
1956 if (rc) {
1957 mutex_unlock(&ses->session_mutex);
1958 /* problem -- put our ses reference */
1959 cifs_put_smb_ses(ses);
1960 FreeXid(xid);
1961 return ERR_PTR(rc);
1962 }
1963 if (ses->need_reconnect) {
1964 cFYI(1, "Session needs reconnect");
1965 rc = cifs_setup_session(xid, ses,
1966 volume_info->local_nls);
1967 if (rc) {
1968 mutex_unlock(&ses->session_mutex);
1969 /* problem -- put our reference */
1970 cifs_put_smb_ses(ses);
1971 FreeXid(xid);
1972 return ERR_PTR(rc);
1973 }
1974 }
1975 mutex_unlock(&ses->session_mutex);
1976
1977 /* existing SMB ses has a server reference already */
1978 cifs_put_tcp_session(server);
1979 FreeXid(xid);
1980 return ses;
1981 }
1982
1983 cFYI(1, "Existing smb sess not found");
1984 ses = sesInfoAlloc();
1985 if (ses == NULL)
1986 goto get_ses_fail;
1987
1988 /* new SMB session uses our server ref */
1989 ses->server = server;
1990 if (server->dstaddr.ss_family == AF_INET6)
1991 sprintf(ses->serverName, "%pI6", &addr6->sin6_addr);
1992 else
1993 sprintf(ses->serverName, "%pI4", &addr->sin_addr);
1994
1995 if (volume_info->username) {
1996 ses->user_name = kstrdup(volume_info->username, GFP_KERNEL);
1997 if (!ses->user_name)
1998 goto get_ses_fail;
1999 }
2000
2001 /* volume_info->password freed at unmount */
2002 if (volume_info->password) {
2003 ses->password = kstrdup(volume_info->password, GFP_KERNEL);
2004 if (!ses->password)
2005 goto get_ses_fail;
2006 }
2007 if (volume_info->domainname) {
2008 ses->domainName = kstrdup(volume_info->domainname, GFP_KERNEL);
2009 if (!ses->domainName)
2010 goto get_ses_fail;
2011 }
2012 ses->cred_uid = volume_info->cred_uid;
2013 ses->linux_uid = volume_info->linux_uid;
2014
2015 /* ntlmv2 is much stronger than ntlm security, and has been broadly
2016 supported for many years, time to update default security mechanism */
2017 if ((volume_info->secFlg == 0) && warned_on_ntlm == false) {
2018 warned_on_ntlm = true;
2019 cERROR(1, "default security mechanism requested. The default "
2020 "security mechanism will be upgraded from ntlm to "
2021 "ntlmv2 in kernel release 3.2");
2022 }
2023 ses->overrideSecFlg = volume_info->secFlg;
2024
2025 mutex_lock(&ses->session_mutex);
2026 rc = cifs_negotiate_protocol(xid, ses);
2027 if (!rc)
2028 rc = cifs_setup_session(xid, ses, volume_info->local_nls);
2029 mutex_unlock(&ses->session_mutex);
2030 if (rc)
2031 goto get_ses_fail;
2032
2033 /* success, put it on the list */
2034 spin_lock(&cifs_tcp_ses_lock);
2035 list_add(&ses->smb_ses_list, &server->smb_ses_list);
2036 spin_unlock(&cifs_tcp_ses_lock);
2037
2038 FreeXid(xid);
2039 return ses;
2040
2041get_ses_fail:
2042 sesInfoFree(ses);
2043 FreeXid(xid);
2044 return ERR_PTR(rc);
2045}
2046
2047static int match_tcon(struct cifs_tcon *tcon, const char *unc)
2048{
2049 if (tcon->tidStatus == CifsExiting)
2050 return 0;
2051 if (strncmp(tcon->treeName, unc, MAX_TREE_SIZE))
2052 return 0;
2053 return 1;
2054}
2055
2056static struct cifs_tcon *
2057cifs_find_tcon(struct cifs_ses *ses, const char *unc)
2058{
2059 struct list_head *tmp;
2060 struct cifs_tcon *tcon;
2061
2062 spin_lock(&cifs_tcp_ses_lock);
2063 list_for_each(tmp, &ses->tcon_list) {
2064 tcon = list_entry(tmp, struct cifs_tcon, tcon_list);
2065 if (!match_tcon(tcon, unc))
2066 continue;
2067 ++tcon->tc_count;
2068 spin_unlock(&cifs_tcp_ses_lock);
2069 return tcon;
2070 }
2071 spin_unlock(&cifs_tcp_ses_lock);
2072 return NULL;
2073}
2074
2075static void
2076cifs_put_tcon(struct cifs_tcon *tcon)
2077{
2078 int xid;
2079 struct cifs_ses *ses = tcon->ses;
2080
2081 cFYI(1, "%s: tc_count=%d\n", __func__, tcon->tc_count);
2082 spin_lock(&cifs_tcp_ses_lock);
2083 if (--tcon->tc_count > 0) {
2084 spin_unlock(&cifs_tcp_ses_lock);
2085 return;
2086 }
2087
2088 list_del_init(&tcon->tcon_list);
2089 spin_unlock(&cifs_tcp_ses_lock);
2090
2091 xid = GetXid();
2092 CIFSSMBTDis(xid, tcon);
2093 _FreeXid(xid);
2094
2095 cifs_fscache_release_super_cookie(tcon);
2096 tconInfoFree(tcon);
2097 cifs_put_smb_ses(ses);
2098}
2099
2100static struct cifs_tcon *
2101cifs_get_tcon(struct cifs_ses *ses, struct smb_vol *volume_info)
2102{
2103 int rc, xid;
2104 struct cifs_tcon *tcon;
2105
2106 tcon = cifs_find_tcon(ses, volume_info->UNC);
2107 if (tcon) {
2108 cFYI(1, "Found match on UNC path");
2109 /* existing tcon already has a reference */
2110 cifs_put_smb_ses(ses);
2111 if (tcon->seal != volume_info->seal)
2112 cERROR(1, "transport encryption setting "
2113 "conflicts with existing tid");
2114 return tcon;
2115 }
2116
2117 tcon = tconInfoAlloc();
2118 if (tcon == NULL) {
2119 rc = -ENOMEM;
2120 goto out_fail;
2121 }
2122
2123 tcon->ses = ses;
2124 if (volume_info->password) {
2125 tcon->password = kstrdup(volume_info->password, GFP_KERNEL);
2126 if (!tcon->password) {
2127 rc = -ENOMEM;
2128 goto out_fail;
2129 }
2130 }
2131
2132 if (strchr(volume_info->UNC + 3, '\\') == NULL
2133 && strchr(volume_info->UNC + 3, '/') == NULL) {
2134 cERROR(1, "Missing share name");
2135 rc = -ENODEV;
2136 goto out_fail;
2137 }
2138
2139 /* BB Do we need to wrap session_mutex around
2140 * this TCon call and Unix SetFS as
2141 * we do on SessSetup and reconnect? */
2142 xid = GetXid();
2143 rc = CIFSTCon(xid, ses, volume_info->UNC, tcon, volume_info->local_nls);
2144 FreeXid(xid);
2145 cFYI(1, "CIFS Tcon rc = %d", rc);
2146 if (rc)
2147 goto out_fail;
2148
2149 if (volume_info->nodfs) {
2150 tcon->Flags &= ~SMB_SHARE_IS_IN_DFS;
2151 cFYI(1, "DFS disabled (%d)", tcon->Flags);
2152 }
2153 tcon->seal = volume_info->seal;
2154 /* we can have only one retry value for a connection
2155 to a share so for resources mounted more than once
2156 to the same server share the last value passed in
2157 for the retry flag is used */
2158 tcon->retry = volume_info->retry;
2159 tcon->nocase = volume_info->nocase;
2160 tcon->local_lease = volume_info->local_lease;
2161
2162 spin_lock(&cifs_tcp_ses_lock);
2163 list_add(&tcon->tcon_list, &ses->tcon_list);
2164 spin_unlock(&cifs_tcp_ses_lock);
2165
2166 cifs_fscache_get_super_cookie(tcon);
2167
2168 return tcon;
2169
2170out_fail:
2171 tconInfoFree(tcon);
2172 return ERR_PTR(rc);
2173}
2174
2175void
2176cifs_put_tlink(struct tcon_link *tlink)
2177{
2178 if (!tlink || IS_ERR(tlink))
2179 return;
2180
2181 if (!atomic_dec_and_test(&tlink->tl_count) ||
2182 test_bit(TCON_LINK_IN_TREE, &tlink->tl_flags)) {
2183 tlink->tl_time = jiffies;
2184 return;
2185 }
2186
2187 if (!IS_ERR(tlink_tcon(tlink)))
2188 cifs_put_tcon(tlink_tcon(tlink));
2189 kfree(tlink);
2190 return;
2191}
2192
2193static inline struct tcon_link *
2194cifs_sb_master_tlink(struct cifs_sb_info *cifs_sb)
2195{
2196 return cifs_sb->master_tlink;
2197}
2198
2199static int
2200compare_mount_options(struct super_block *sb, struct cifs_mnt_data *mnt_data)
2201{
2202 struct cifs_sb_info *old = CIFS_SB(sb);
2203 struct cifs_sb_info *new = mnt_data->cifs_sb;
2204
2205 if ((sb->s_flags & CIFS_MS_MASK) != (mnt_data->flags & CIFS_MS_MASK))
2206 return 0;
2207
2208 if ((old->mnt_cifs_flags & CIFS_MOUNT_MASK) !=
2209 (new->mnt_cifs_flags & CIFS_MOUNT_MASK))
2210 return 0;
2211
2212 if (old->rsize != new->rsize)
2213 return 0;
2214
2215 /*
2216 * We want to share sb only if we don't specify wsize or specified wsize
2217 * is greater or equal than existing one.
2218 */
2219 if (new->wsize && new->wsize < old->wsize)
2220 return 0;
2221
2222 if (old->mnt_uid != new->mnt_uid || old->mnt_gid != new->mnt_gid)
2223 return 0;
2224
2225 if (old->mnt_file_mode != new->mnt_file_mode ||
2226 old->mnt_dir_mode != new->mnt_dir_mode)
2227 return 0;
2228
2229 if (strcmp(old->local_nls->charset, new->local_nls->charset))
2230 return 0;
2231
2232 if (old->actimeo != new->actimeo)
2233 return 0;
2234
2235 return 1;
2236}
2237
2238int
2239cifs_match_super(struct super_block *sb, void *data)
2240{
2241 struct cifs_mnt_data *mnt_data = (struct cifs_mnt_data *)data;
2242 struct smb_vol *volume_info;
2243 struct cifs_sb_info *cifs_sb;
2244 struct TCP_Server_Info *tcp_srv;
2245 struct cifs_ses *ses;
2246 struct cifs_tcon *tcon;
2247 struct tcon_link *tlink;
2248 struct sockaddr_storage addr;
2249 int rc = 0;
2250
2251 memset(&addr, 0, sizeof(struct sockaddr_storage));
2252
2253 spin_lock(&cifs_tcp_ses_lock);
2254 cifs_sb = CIFS_SB(sb);
2255 tlink = cifs_get_tlink(cifs_sb_master_tlink(cifs_sb));
2256 if (IS_ERR(tlink)) {
2257 spin_unlock(&cifs_tcp_ses_lock);
2258 return rc;
2259 }
2260 tcon = tlink_tcon(tlink);
2261 ses = tcon->ses;
2262 tcp_srv = ses->server;
2263
2264 volume_info = mnt_data->vol;
2265
2266 if (!volume_info->UNCip || !volume_info->UNC)
2267 goto out;
2268
2269 rc = cifs_fill_sockaddr((struct sockaddr *)&addr,
2270 volume_info->UNCip,
2271 strlen(volume_info->UNCip),
2272 volume_info->port);
2273 if (!rc)
2274 goto out;
2275
2276 if (!match_server(tcp_srv, (struct sockaddr *)&addr, volume_info) ||
2277 !match_session(ses, volume_info) ||
2278 !match_tcon(tcon, volume_info->UNC)) {
2279 rc = 0;
2280 goto out;
2281 }
2282
2283 rc = compare_mount_options(sb, mnt_data);
2284out:
2285 spin_unlock(&cifs_tcp_ses_lock);
2286 cifs_put_tlink(tlink);
2287 return rc;
2288}
2289
2290int
2291get_dfs_path(int xid, struct cifs_ses *pSesInfo, const char *old_path,
2292 const struct nls_table *nls_codepage, unsigned int *pnum_referrals,
2293 struct dfs_info3_param **preferrals, int remap)
2294{
2295 char *temp_unc;
2296 int rc = 0;
2297
2298 *pnum_referrals = 0;
2299 *preferrals = NULL;
2300
2301 if (pSesInfo->ipc_tid == 0) {
2302 temp_unc = kmalloc(2 /* for slashes */ +
2303 strnlen(pSesInfo->serverName,
2304 SERVER_NAME_LEN_WITH_NULL * 2)
2305 + 1 + 4 /* slash IPC$ */ + 2,
2306 GFP_KERNEL);
2307 if (temp_unc == NULL)
2308 return -ENOMEM;
2309 temp_unc[0] = '\\';
2310 temp_unc[1] = '\\';
2311 strcpy(temp_unc + 2, pSesInfo->serverName);
2312 strcpy(temp_unc + 2 + strlen(pSesInfo->serverName), "\\IPC$");
2313 rc = CIFSTCon(xid, pSesInfo, temp_unc, NULL, nls_codepage);
2314 cFYI(1, "CIFS Tcon rc = %d ipc_tid = %d", rc, pSesInfo->ipc_tid);
2315 kfree(temp_unc);
2316 }
2317 if (rc == 0)
2318 rc = CIFSGetDFSRefer(xid, pSesInfo, old_path, preferrals,
2319 pnum_referrals, nls_codepage, remap);
2320 /* BB map targetUNCs to dfs_info3 structures, here or
2321 in CIFSGetDFSRefer BB */
2322
2323 return rc;
2324}
2325
2326#ifdef CONFIG_DEBUG_LOCK_ALLOC
2327static struct lock_class_key cifs_key[2];
2328static struct lock_class_key cifs_slock_key[2];
2329
2330static inline void
2331cifs_reclassify_socket4(struct socket *sock)
2332{
2333 struct sock *sk = sock->sk;
2334 BUG_ON(sock_owned_by_user(sk));
2335 sock_lock_init_class_and_name(sk, "slock-AF_INET-CIFS",
2336 &cifs_slock_key[0], "sk_lock-AF_INET-CIFS", &cifs_key[0]);
2337}
2338
2339static inline void
2340cifs_reclassify_socket6(struct socket *sock)
2341{
2342 struct sock *sk = sock->sk;
2343 BUG_ON(sock_owned_by_user(sk));
2344 sock_lock_init_class_and_name(sk, "slock-AF_INET6-CIFS",
2345 &cifs_slock_key[1], "sk_lock-AF_INET6-CIFS", &cifs_key[1]);
2346}
2347#else
2348static inline void
2349cifs_reclassify_socket4(struct socket *sock)
2350{
2351}
2352
2353static inline void
2354cifs_reclassify_socket6(struct socket *sock)
2355{
2356}
2357#endif
2358
2359/* See RFC1001 section 14 on representation of Netbios names */
2360static void rfc1002mangle(char *target, char *source, unsigned int length)
2361{
2362 unsigned int i, j;
2363
2364 for (i = 0, j = 0; i < (length); i++) {
2365 /* mask a nibble at a time and encode */
2366 target[j] = 'A' + (0x0F & (source[i] >> 4));
2367 target[j+1] = 'A' + (0x0F & source[i]);
2368 j += 2;
2369 }
2370
2371}
2372
2373static int
2374bind_socket(struct TCP_Server_Info *server)
2375{
2376 int rc = 0;
2377 if (server->srcaddr.ss_family != AF_UNSPEC) {
2378 /* Bind to the specified local IP address */
2379 struct socket *socket = server->ssocket;
2380 rc = socket->ops->bind(socket,
2381 (struct sockaddr *) &server->srcaddr,
2382 sizeof(server->srcaddr));
2383 if (rc < 0) {
2384 struct sockaddr_in *saddr4;
2385 struct sockaddr_in6 *saddr6;
2386 saddr4 = (struct sockaddr_in *)&server->srcaddr;
2387 saddr6 = (struct sockaddr_in6 *)&server->srcaddr;
2388 if (saddr6->sin6_family == AF_INET6)
2389 cERROR(1, "cifs: "
2390 "Failed to bind to: %pI6c, error: %d\n",
2391 &saddr6->sin6_addr, rc);
2392 else
2393 cERROR(1, "cifs: "
2394 "Failed to bind to: %pI4, error: %d\n",
2395 &saddr4->sin_addr.s_addr, rc);
2396 }
2397 }
2398 return rc;
2399}
2400
2401static int
2402ip_rfc1001_connect(struct TCP_Server_Info *server)
2403{
2404 int rc = 0;
2405 /*
2406 * some servers require RFC1001 sessinit before sending
2407 * negprot - BB check reconnection in case where second
2408 * sessinit is sent but no second negprot
2409 */
2410 struct rfc1002_session_packet *ses_init_buf;
2411 struct smb_hdr *smb_buf;
2412 ses_init_buf = kzalloc(sizeof(struct rfc1002_session_packet),
2413 GFP_KERNEL);
2414 if (ses_init_buf) {
2415 ses_init_buf->trailer.session_req.called_len = 32;
2416
2417 if (server->server_RFC1001_name &&
2418 server->server_RFC1001_name[0] != 0)
2419 rfc1002mangle(ses_init_buf->trailer.
2420 session_req.called_name,
2421 server->server_RFC1001_name,
2422 RFC1001_NAME_LEN_WITH_NULL);
2423 else
2424 rfc1002mangle(ses_init_buf->trailer.
2425 session_req.called_name,
2426 DEFAULT_CIFS_CALLED_NAME,
2427 RFC1001_NAME_LEN_WITH_NULL);
2428
2429 ses_init_buf->trailer.session_req.calling_len = 32;
2430
2431 /*
2432 * calling name ends in null (byte 16) from old smb
2433 * convention.
2434 */
2435 if (server->workstation_RFC1001_name &&
2436 server->workstation_RFC1001_name[0] != 0)
2437 rfc1002mangle(ses_init_buf->trailer.
2438 session_req.calling_name,
2439 server->workstation_RFC1001_name,
2440 RFC1001_NAME_LEN_WITH_NULL);
2441 else
2442 rfc1002mangle(ses_init_buf->trailer.
2443 session_req.calling_name,
2444 "LINUX_CIFS_CLNT",
2445 RFC1001_NAME_LEN_WITH_NULL);
2446
2447 ses_init_buf->trailer.session_req.scope1 = 0;
2448 ses_init_buf->trailer.session_req.scope2 = 0;
2449 smb_buf = (struct smb_hdr *)ses_init_buf;
2450
2451 /* sizeof RFC1002_SESSION_REQUEST with no scope */
2452 smb_buf->smb_buf_length = cpu_to_be32(0x81000044);
2453 rc = smb_send(server, smb_buf, 0x44);
2454 kfree(ses_init_buf);
2455 /*
2456 * RFC1001 layer in at least one server
2457 * requires very short break before negprot
2458 * presumably because not expecting negprot
2459 * to follow so fast. This is a simple
2460 * solution that works without
2461 * complicating the code and causes no
2462 * significant slowing down on mount
2463 * for everyone else
2464 */
2465 usleep_range(1000, 2000);
2466 }
2467 /*
2468 * else the negprot may still work without this
2469 * even though malloc failed
2470 */
2471
2472 return rc;
2473}
2474
2475static int
2476generic_ip_connect(struct TCP_Server_Info *server)
2477{
2478 int rc = 0;
2479 __be16 sport;
2480 int slen, sfamily;
2481 struct socket *socket = server->ssocket;
2482 struct sockaddr *saddr;
2483
2484 saddr = (struct sockaddr *) &server->dstaddr;
2485
2486 if (server->dstaddr.ss_family == AF_INET6) {
2487 sport = ((struct sockaddr_in6 *) saddr)->sin6_port;
2488 slen = sizeof(struct sockaddr_in6);
2489 sfamily = AF_INET6;
2490 } else {
2491 sport = ((struct sockaddr_in *) saddr)->sin_port;
2492 slen = sizeof(struct sockaddr_in);
2493 sfamily = AF_INET;
2494 }
2495
2496 if (socket == NULL) {
2497 rc = __sock_create(cifs_net_ns(server), sfamily, SOCK_STREAM,
2498 IPPROTO_TCP, &socket, 1);
2499 if (rc < 0) {
2500 cERROR(1, "Error %d creating socket", rc);
2501 server->ssocket = NULL;
2502 return rc;
2503 }
2504
2505 /* BB other socket options to set KEEPALIVE, NODELAY? */
2506 cFYI(1, "Socket created");
2507 server->ssocket = socket;
2508 socket->sk->sk_allocation = GFP_NOFS;
2509 if (sfamily == AF_INET6)
2510 cifs_reclassify_socket6(socket);
2511 else
2512 cifs_reclassify_socket4(socket);
2513 }
2514
2515 rc = bind_socket(server);
2516 if (rc < 0)
2517 return rc;
2518
2519 /*
2520 * Eventually check for other socket options to change from
2521 * the default. sock_setsockopt not used because it expects
2522 * user space buffer
2523 */
2524 socket->sk->sk_rcvtimeo = 7 * HZ;
2525 socket->sk->sk_sndtimeo = 5 * HZ;
2526
2527 /* make the bufsizes depend on wsize/rsize and max requests */
2528 if (server->noautotune) {
2529 if (socket->sk->sk_sndbuf < (200 * 1024))
2530 socket->sk->sk_sndbuf = 200 * 1024;
2531 if (socket->sk->sk_rcvbuf < (140 * 1024))
2532 socket->sk->sk_rcvbuf = 140 * 1024;
2533 }
2534
2535 if (server->tcp_nodelay) {
2536 int val = 1;
2537 rc = kernel_setsockopt(socket, SOL_TCP, TCP_NODELAY,
2538 (char *)&val, sizeof(val));
2539 if (rc)
2540 cFYI(1, "set TCP_NODELAY socket option error %d", rc);
2541 }
2542
2543 cFYI(1, "sndbuf %d rcvbuf %d rcvtimeo 0x%lx",
2544 socket->sk->sk_sndbuf,
2545 socket->sk->sk_rcvbuf, socket->sk->sk_rcvtimeo);
2546
2547 rc = socket->ops->connect(socket, saddr, slen, 0);
2548 if (rc < 0) {
2549 cFYI(1, "Error %d connecting to server", rc);
2550 sock_release(socket);
2551 server->ssocket = NULL;
2552 return rc;
2553 }
2554
2555 if (sport == htons(RFC1001_PORT))
2556 rc = ip_rfc1001_connect(server);
2557
2558 return rc;
2559}
2560
2561static int
2562ip_connect(struct TCP_Server_Info *server)
2563{
2564 __be16 *sport;
2565 struct sockaddr_in6 *addr6 = (struct sockaddr_in6 *)&server->dstaddr;
2566 struct sockaddr_in *addr = (struct sockaddr_in *)&server->dstaddr;
2567
2568 if (server->dstaddr.ss_family == AF_INET6)
2569 sport = &addr6->sin6_port;
2570 else
2571 sport = &addr->sin_port;
2572
2573 if (*sport == 0) {
2574 int rc;
2575
2576 /* try with 445 port at first */
2577 *sport = htons(CIFS_PORT);
2578
2579 rc = generic_ip_connect(server);
2580 if (rc >= 0)
2581 return rc;
2582
2583 /* if it failed, try with 139 port */
2584 *sport = htons(RFC1001_PORT);
2585 }
2586
2587 return generic_ip_connect(server);
2588}
2589
2590void reset_cifs_unix_caps(int xid, struct cifs_tcon *tcon,
2591 struct cifs_sb_info *cifs_sb, struct smb_vol *vol_info)
2592{
2593 /* if we are reconnecting then should we check to see if
2594 * any requested capabilities changed locally e.g. via
2595 * remount but we can not do much about it here
2596 * if they have (even if we could detect it by the following)
2597 * Perhaps we could add a backpointer to array of sb from tcon
2598 * or if we change to make all sb to same share the same
2599 * sb as NFS - then we only have one backpointer to sb.
2600 * What if we wanted to mount the server share twice once with
2601 * and once without posixacls or posix paths? */
2602 __u64 saved_cap = le64_to_cpu(tcon->fsUnixInfo.Capability);
2603
2604 if (vol_info && vol_info->no_linux_ext) {
2605 tcon->fsUnixInfo.Capability = 0;
2606 tcon->unix_ext = 0; /* Unix Extensions disabled */
2607 cFYI(1, "Linux protocol extensions disabled");
2608 return;
2609 } else if (vol_info)
2610 tcon->unix_ext = 1; /* Unix Extensions supported */
2611
2612 if (tcon->unix_ext == 0) {
2613 cFYI(1, "Unix extensions disabled so not set on reconnect");
2614 return;
2615 }
2616
2617 if (!CIFSSMBQFSUnixInfo(xid, tcon)) {
2618 __u64 cap = le64_to_cpu(tcon->fsUnixInfo.Capability);
2619 cFYI(1, "unix caps which server supports %lld", cap);
2620 /* check for reconnect case in which we do not
2621 want to change the mount behavior if we can avoid it */
2622 if (vol_info == NULL) {
2623 /* turn off POSIX ACL and PATHNAMES if not set
2624 originally at mount time */
2625 if ((saved_cap & CIFS_UNIX_POSIX_ACL_CAP) == 0)
2626 cap &= ~CIFS_UNIX_POSIX_ACL_CAP;
2627 if ((saved_cap & CIFS_UNIX_POSIX_PATHNAMES_CAP) == 0) {
2628 if (cap & CIFS_UNIX_POSIX_PATHNAMES_CAP)
2629 cERROR(1, "POSIXPATH support change");
2630 cap &= ~CIFS_UNIX_POSIX_PATHNAMES_CAP;
2631 } else if ((cap & CIFS_UNIX_POSIX_PATHNAMES_CAP) == 0) {
2632 cERROR(1, "possible reconnect error");
2633 cERROR(1, "server disabled POSIX path support");
2634 }
2635 }
2636
2637 if (cap & CIFS_UNIX_TRANSPORT_ENCRYPTION_MANDATORY_CAP)
2638 cERROR(1, "per-share encryption not supported yet");
2639
2640 cap &= CIFS_UNIX_CAP_MASK;
2641 if (vol_info && vol_info->no_psx_acl)
2642 cap &= ~CIFS_UNIX_POSIX_ACL_CAP;
2643 else if (CIFS_UNIX_POSIX_ACL_CAP & cap) {
2644 cFYI(1, "negotiated posix acl support");
2645 if (cifs_sb)
2646 cifs_sb->mnt_cifs_flags |=
2647 CIFS_MOUNT_POSIXACL;
2648 }
2649
2650 if (vol_info && vol_info->posix_paths == 0)
2651 cap &= ~CIFS_UNIX_POSIX_PATHNAMES_CAP;
2652 else if (cap & CIFS_UNIX_POSIX_PATHNAMES_CAP) {
2653 cFYI(1, "negotiate posix pathnames");
2654 if (cifs_sb)
2655 cifs_sb->mnt_cifs_flags |=
2656 CIFS_MOUNT_POSIX_PATHS;
2657 }
2658
2659 if (cifs_sb && (cifs_sb->rsize > 127 * 1024)) {
2660 if ((cap & CIFS_UNIX_LARGE_READ_CAP) == 0) {
2661 cifs_sb->rsize = 127 * 1024;
2662 cFYI(DBG2, "larger reads not supported by srv");
2663 }
2664 }
2665
2666
2667 cFYI(1, "Negotiate caps 0x%x", (int)cap);
2668#ifdef CONFIG_CIFS_DEBUG2
2669 if (cap & CIFS_UNIX_FCNTL_CAP)
2670 cFYI(1, "FCNTL cap");
2671 if (cap & CIFS_UNIX_EXTATTR_CAP)
2672 cFYI(1, "EXTATTR cap");
2673 if (cap & CIFS_UNIX_POSIX_PATHNAMES_CAP)
2674 cFYI(1, "POSIX path cap");
2675 if (cap & CIFS_UNIX_XATTR_CAP)
2676 cFYI(1, "XATTR cap");
2677 if (cap & CIFS_UNIX_POSIX_ACL_CAP)
2678 cFYI(1, "POSIX ACL cap");
2679 if (cap & CIFS_UNIX_LARGE_READ_CAP)
2680 cFYI(1, "very large read cap");
2681 if (cap & CIFS_UNIX_LARGE_WRITE_CAP)
2682 cFYI(1, "very large write cap");
2683 if (cap & CIFS_UNIX_TRANSPORT_ENCRYPTION_CAP)
2684 cFYI(1, "transport encryption cap");
2685 if (cap & CIFS_UNIX_TRANSPORT_ENCRYPTION_MANDATORY_CAP)
2686 cFYI(1, "mandatory transport encryption cap");
2687#endif /* CIFS_DEBUG2 */
2688 if (CIFSSMBSetFSUnixInfo(xid, tcon, cap)) {
2689 if (vol_info == NULL) {
2690 cFYI(1, "resetting capabilities failed");
2691 } else
2692 cERROR(1, "Negotiating Unix capabilities "
2693 "with the server failed. Consider "
2694 "mounting with the Unix Extensions\n"
2695 "disabled, if problems are found, "
2696 "by specifying the nounix mount "
2697 "option.");
2698
2699 }
2700 }
2701}
2702
2703void cifs_setup_cifs_sb(struct smb_vol *pvolume_info,
2704 struct cifs_sb_info *cifs_sb)
2705{
2706 INIT_DELAYED_WORK(&cifs_sb->prune_tlinks, cifs_prune_tlinks);
2707
2708 spin_lock_init(&cifs_sb->tlink_tree_lock);
2709 cifs_sb->tlink_tree = RB_ROOT;
2710
2711 if (pvolume_info->rsize > CIFSMaxBufSize) {
2712 cERROR(1, "rsize %d too large, using MaxBufSize",
2713 pvolume_info->rsize);
2714 cifs_sb->rsize = CIFSMaxBufSize;
2715 } else if ((pvolume_info->rsize) &&
2716 (pvolume_info->rsize <= CIFSMaxBufSize))
2717 cifs_sb->rsize = pvolume_info->rsize;
2718 else /* default */
2719 cifs_sb->rsize = CIFSMaxBufSize;
2720
2721 if (cifs_sb->rsize < 2048) {
2722 cifs_sb->rsize = 2048;
2723 /* Windows ME may prefer this */
2724 cFYI(1, "readsize set to minimum: 2048");
2725 }
2726
2727 /*
2728 * Temporarily set wsize for matching superblock. If we end up using
2729 * new sb then cifs_negotiate_wsize will later negotiate it downward
2730 * if needed.
2731 */
2732 cifs_sb->wsize = pvolume_info->wsize;
2733
2734 cifs_sb->mnt_uid = pvolume_info->linux_uid;
2735 cifs_sb->mnt_gid = pvolume_info->linux_gid;
2736 cifs_sb->mnt_file_mode = pvolume_info->file_mode;
2737 cifs_sb->mnt_dir_mode = pvolume_info->dir_mode;
2738 cFYI(1, "file mode: 0x%x dir mode: 0x%x",
2739 cifs_sb->mnt_file_mode, cifs_sb->mnt_dir_mode);
2740
2741 cifs_sb->actimeo = pvolume_info->actimeo;
2742 cifs_sb->local_nls = pvolume_info->local_nls;
2743
2744 if (pvolume_info->noperm)
2745 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_NO_PERM;
2746 if (pvolume_info->setuids)
2747 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_SET_UID;
2748 if (pvolume_info->server_ino)
2749 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_SERVER_INUM;
2750 if (pvolume_info->remap)
2751 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_MAP_SPECIAL_CHR;
2752 if (pvolume_info->no_xattr)
2753 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_NO_XATTR;
2754 if (pvolume_info->sfu_emul)
2755 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_UNX_EMUL;
2756 if (pvolume_info->nobrl)
2757 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_NO_BRL;
2758 if (pvolume_info->nostrictsync)
2759 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_NOSSYNC;
2760 if (pvolume_info->mand_lock)
2761 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_NOPOSIXBRL;
2762 if (pvolume_info->rwpidforward)
2763 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_RWPIDFORWARD;
2764 if (pvolume_info->cifs_acl)
2765 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_CIFS_ACL;
2766 if (pvolume_info->override_uid)
2767 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_OVERR_UID;
2768 if (pvolume_info->override_gid)
2769 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_OVERR_GID;
2770 if (pvolume_info->dynperm)
2771 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_DYNPERM;
2772 if (pvolume_info->fsc)
2773 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_FSCACHE;
2774 if (pvolume_info->multiuser)
2775 cifs_sb->mnt_cifs_flags |= (CIFS_MOUNT_MULTIUSER |
2776 CIFS_MOUNT_NO_PERM);
2777 if (pvolume_info->strict_io)
2778 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_STRICT_IO;
2779 if (pvolume_info->direct_io) {
2780 cFYI(1, "mounting share using direct i/o");
2781 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_DIRECT_IO;
2782 }
2783 if (pvolume_info->mfsymlinks) {
2784 if (pvolume_info->sfu_emul) {
2785 cERROR(1, "mount option mfsymlinks ignored if sfu "
2786 "mount option is used");
2787 } else {
2788 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_MF_SYMLINKS;
2789 }
2790 }
2791
2792 if ((pvolume_info->cifs_acl) && (pvolume_info->dynperm))
2793 cERROR(1, "mount option dynperm ignored if cifsacl "
2794 "mount option supported");
2795}
2796
2797/*
2798 * When the server supports very large writes via POSIX extensions, we can
2799 * allow up to 2^24-1, minus the size of a WRITE_AND_X header, not including
2800 * the RFC1001 length.
2801 *
2802 * Note that this might make for "interesting" allocation problems during
2803 * writeback however as we have to allocate an array of pointers for the
2804 * pages. A 16M write means ~32kb page array with PAGE_CACHE_SIZE == 4096.
2805 */
2806#define CIFS_MAX_WSIZE ((1<<24) - 1 - sizeof(WRITE_REQ) + 4)
2807
2808/*
2809 * When the server doesn't allow large posix writes, only allow a wsize of
2810 * 128k minus the size of the WRITE_AND_X header. That allows for a write up
2811 * to the maximum size described by RFC1002.
2812 */
2813#define CIFS_MAX_RFC1002_WSIZE (128 * 1024 - sizeof(WRITE_REQ) + 4)
2814
2815/*
2816 * The default wsize is 1M. find_get_pages seems to return a maximum of 256
2817 * pages in a single call. With PAGE_CACHE_SIZE == 4k, this means we can fill
2818 * a single wsize request with a single call.
2819 */
2820#define CIFS_DEFAULT_WSIZE (1024 * 1024)
2821
2822static unsigned int
2823cifs_negotiate_wsize(struct cifs_tcon *tcon, struct smb_vol *pvolume_info)
2824{
2825 __u64 unix_cap = le64_to_cpu(tcon->fsUnixInfo.Capability);
2826 struct TCP_Server_Info *server = tcon->ses->server;
2827 unsigned int wsize = pvolume_info->wsize ? pvolume_info->wsize :
2828 CIFS_DEFAULT_WSIZE;
2829
2830 /* can server support 24-bit write sizes? (via UNIX extensions) */
2831 if (!tcon->unix_ext || !(unix_cap & CIFS_UNIX_LARGE_WRITE_CAP))
2832 wsize = min_t(unsigned int, wsize, CIFS_MAX_RFC1002_WSIZE);
2833
2834 /*
2835 * no CAP_LARGE_WRITE_X or is signing enabled without CAP_UNIX set?
2836 * Limit it to max buffer offered by the server, minus the size of the
2837 * WRITEX header, not including the 4 byte RFC1001 length.
2838 */
2839 if (!(server->capabilities & CAP_LARGE_WRITE_X) ||
2840 (!(server->capabilities & CAP_UNIX) &&
2841 (server->sec_mode & (SECMODE_SIGN_ENABLED|SECMODE_SIGN_REQUIRED))))
2842 wsize = min_t(unsigned int, wsize,
2843 server->maxBuf - sizeof(WRITE_REQ) + 4);
2844
2845 /* hard limit of CIFS_MAX_WSIZE */
2846 wsize = min_t(unsigned int, wsize, CIFS_MAX_WSIZE);
2847
2848 return wsize;
2849}
2850
2851static int
2852is_path_accessible(int xid, struct cifs_tcon *tcon,
2853 struct cifs_sb_info *cifs_sb, const char *full_path)
2854{
2855 int rc;
2856 FILE_ALL_INFO *pfile_info;
2857
2858 pfile_info = kmalloc(sizeof(FILE_ALL_INFO), GFP_KERNEL);
2859 if (pfile_info == NULL)
2860 return -ENOMEM;
2861
2862 rc = CIFSSMBQPathInfo(xid, tcon, full_path, pfile_info,
2863 0 /* not legacy */, cifs_sb->local_nls,
2864 cifs_sb->mnt_cifs_flags &
2865 CIFS_MOUNT_MAP_SPECIAL_CHR);
2866
2867 if (rc == -EOPNOTSUPP || rc == -EINVAL)
2868 rc = SMBQueryInformation(xid, tcon, full_path, pfile_info,
2869 cifs_sb->local_nls, cifs_sb->mnt_cifs_flags &
2870 CIFS_MOUNT_MAP_SPECIAL_CHR);
2871 kfree(pfile_info);
2872 return rc;
2873}
2874
2875static void
2876cleanup_volume_info_contents(struct smb_vol *volume_info)
2877{
2878 kfree(volume_info->username);
2879 kzfree(volume_info->password);
2880 kfree(volume_info->UNC);
2881 if (volume_info->UNCip != volume_info->UNC + 2)
2882 kfree(volume_info->UNCip);
2883 kfree(volume_info->domainname);
2884 kfree(volume_info->iocharset);
2885 kfree(volume_info->prepath);
2886}
2887
2888void
2889cifs_cleanup_volume_info(struct smb_vol *volume_info)
2890{
2891 if (!volume_info)
2892 return;
2893 cleanup_volume_info_contents(volume_info);
2894 kfree(volume_info);
2895}
2896
2897
2898#ifdef CONFIG_CIFS_DFS_UPCALL
2899/* build_path_to_root returns full path to root when
2900 * we do not have an exiting connection (tcon) */
2901static char *
2902build_unc_path_to_root(const struct smb_vol *vol,
2903 const struct cifs_sb_info *cifs_sb)
2904{
2905 char *full_path, *pos;
2906 unsigned int pplen = vol->prepath ? strlen(vol->prepath) : 0;
2907 unsigned int unc_len = strnlen(vol->UNC, MAX_TREE_SIZE + 1);
2908
2909 full_path = kmalloc(unc_len + pplen + 1, GFP_KERNEL);
2910 if (full_path == NULL)
2911 return ERR_PTR(-ENOMEM);
2912
2913 strncpy(full_path, vol->UNC, unc_len);
2914 pos = full_path + unc_len;
2915
2916 if (pplen) {
2917 strncpy(pos, vol->prepath, pplen);
2918 pos += pplen;
2919 }
2920
2921 *pos = '\0'; /* add trailing null */
2922 convert_delimiter(full_path, CIFS_DIR_SEP(cifs_sb));
2923 cFYI(1, "%s: full_path=%s", __func__, full_path);
2924 return full_path;
2925}
2926
2927/*
2928 * Perform a dfs referral query for a share and (optionally) prefix
2929 *
2930 * If a referral is found, cifs_sb->mountdata will be (re-)allocated
2931 * to a string containing updated options for the submount. Otherwise it
2932 * will be left untouched.
2933 *
2934 * Returns the rc from get_dfs_path to the caller, which can be used to
2935 * determine whether there were referrals.
2936 */
2937static int
2938expand_dfs_referral(int xid, struct cifs_ses *pSesInfo,
2939 struct smb_vol *volume_info, struct cifs_sb_info *cifs_sb,
2940 int check_prefix)
2941{
2942 int rc;
2943 unsigned int num_referrals = 0;
2944 struct dfs_info3_param *referrals = NULL;
2945 char *full_path = NULL, *ref_path = NULL, *mdata = NULL;
2946
2947 full_path = build_unc_path_to_root(volume_info, cifs_sb);
2948 if (IS_ERR(full_path))
2949 return PTR_ERR(full_path);
2950
2951 /* For DFS paths, skip the first '\' of the UNC */
2952 ref_path = check_prefix ? full_path + 1 : volume_info->UNC + 1;
2953
2954 rc = get_dfs_path(xid, pSesInfo , ref_path, cifs_sb->local_nls,
2955 &num_referrals, &referrals,
2956 cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR);
2957
2958 if (!rc && num_referrals > 0) {
2959 char *fake_devname = NULL;
2960
2961 mdata = cifs_compose_mount_options(cifs_sb->mountdata,
2962 full_path + 1, referrals,
2963 &fake_devname);
2964
2965 free_dfs_info_array(referrals, num_referrals);
2966
2967 if (IS_ERR(mdata)) {
2968 rc = PTR_ERR(mdata);
2969 mdata = NULL;
2970 } else {
2971 cleanup_volume_info_contents(volume_info);
2972 memset(volume_info, '\0', sizeof(*volume_info));
2973 rc = cifs_setup_volume_info(volume_info, mdata,
2974 fake_devname);
2975 }
2976 kfree(fake_devname);
2977 kfree(cifs_sb->mountdata);
2978 cifs_sb->mountdata = mdata;
2979 }
2980 kfree(full_path);
2981 return rc;
2982}
2983#endif
2984
2985static int
2986cifs_setup_volume_info(struct smb_vol *volume_info, char *mount_data,
2987 const char *devname)
2988{
2989 int rc = 0;
2990
2991 if (cifs_parse_mount_options(mount_data, devname, volume_info))
2992 return -EINVAL;
2993
2994 if (volume_info->nullauth) {
2995 cFYI(1, "null user");
2996 volume_info->username = kzalloc(1, GFP_KERNEL);
2997 if (volume_info->username == NULL)
2998 return -ENOMEM;
2999 } else if (volume_info->username) {
3000 /* BB fixme parse for domain name here */
3001 cFYI(1, "Username: %s", volume_info->username);
3002 } else {
3003 cifserror("No username specified");
3004 /* In userspace mount helper we can get user name from alternate
3005 locations such as env variables and files on disk */
3006 return -EINVAL;
3007 }
3008
3009 /* this is needed for ASCII cp to Unicode converts */
3010 if (volume_info->iocharset == NULL) {
3011 /* load_nls_default cannot return null */
3012 volume_info->local_nls = load_nls_default();
3013 } else {
3014 volume_info->local_nls = load_nls(volume_info->iocharset);
3015 if (volume_info->local_nls == NULL) {
3016 cERROR(1, "CIFS mount error: iocharset %s not found",
3017 volume_info->iocharset);
3018 return -ELIBACC;
3019 }
3020 }
3021
3022 return rc;
3023}
3024
3025struct smb_vol *
3026cifs_get_volume_info(char *mount_data, const char *devname)
3027{
3028 int rc;
3029 struct smb_vol *volume_info;
3030
3031 volume_info = kzalloc(sizeof(struct smb_vol), GFP_KERNEL);
3032 if (!volume_info)
3033 return ERR_PTR(-ENOMEM);
3034
3035 rc = cifs_setup_volume_info(volume_info, mount_data, devname);
3036 if (rc) {
3037 cifs_cleanup_volume_info(volume_info);
3038 volume_info = ERR_PTR(rc);
3039 }
3040
3041 return volume_info;
3042}
3043
3044int
3045cifs_mount(struct cifs_sb_info *cifs_sb, struct smb_vol *volume_info)
3046{
3047 int rc = 0;
3048 int xid;
3049 struct cifs_ses *pSesInfo;
3050 struct cifs_tcon *tcon;
3051 struct TCP_Server_Info *srvTcp;
3052 char *full_path;
3053 struct tcon_link *tlink;
3054#ifdef CONFIG_CIFS_DFS_UPCALL
3055 int referral_walks_count = 0;
3056#endif
3057
3058 rc = bdi_setup_and_register(&cifs_sb->bdi, "cifs", BDI_CAP_MAP_COPY);
3059 if (rc)
3060 return rc;
3061
3062 cifs_sb->bdi.ra_pages = default_backing_dev_info.ra_pages;
3063
3064#ifdef CONFIG_CIFS_DFS_UPCALL
3065try_mount_again:
3066 /* cleanup activities if we're chasing a referral */
3067 if (referral_walks_count) {
3068 if (tcon)
3069 cifs_put_tcon(tcon);
3070 else if (pSesInfo)
3071 cifs_put_smb_ses(pSesInfo);
3072
3073 FreeXid(xid);
3074 }
3075#endif
3076 tcon = NULL;
3077 pSesInfo = NULL;
3078 srvTcp = NULL;
3079 full_path = NULL;
3080 tlink = NULL;
3081
3082 xid = GetXid();
3083
3084 /* get a reference to a tcp session */
3085 srvTcp = cifs_get_tcp_session(volume_info);
3086 if (IS_ERR(srvTcp)) {
3087 rc = PTR_ERR(srvTcp);
3088 bdi_destroy(&cifs_sb->bdi);
3089 goto out;
3090 }
3091
3092 /* get a reference to a SMB session */
3093 pSesInfo = cifs_get_smb_ses(srvTcp, volume_info);
3094 if (IS_ERR(pSesInfo)) {
3095 rc = PTR_ERR(pSesInfo);
3096 pSesInfo = NULL;
3097 goto mount_fail_check;
3098 }
3099
3100 /* search for existing tcon to this server share */
3101 tcon = cifs_get_tcon(pSesInfo, volume_info);
3102 if (IS_ERR(tcon)) {
3103 rc = PTR_ERR(tcon);
3104 tcon = NULL;
3105 goto remote_path_check;
3106 }
3107
3108 /* tell server which Unix caps we support */
3109 if (tcon->ses->capabilities & CAP_UNIX) {
3110 /* reset of caps checks mount to see if unix extensions
3111 disabled for just this mount */
3112 reset_cifs_unix_caps(xid, tcon, cifs_sb, volume_info);
3113 if ((tcon->ses->server->tcpStatus == CifsNeedReconnect) &&
3114 (le64_to_cpu(tcon->fsUnixInfo.Capability) &
3115 CIFS_UNIX_TRANSPORT_ENCRYPTION_MANDATORY_CAP)) {
3116 rc = -EACCES;
3117 goto mount_fail_check;
3118 }
3119 } else
3120 tcon->unix_ext = 0; /* server does not support them */
3121
3122 /* do not care if following two calls succeed - informational */
3123 if (!tcon->ipc) {
3124 CIFSSMBQFSDeviceInfo(xid, tcon);
3125 CIFSSMBQFSAttributeInfo(xid, tcon);
3126 }
3127
3128 if ((tcon->unix_ext == 0) && (cifs_sb->rsize > (1024 * 127))) {
3129 cifs_sb->rsize = 1024 * 127;
3130 cFYI(DBG2, "no very large read support, rsize now 127K");
3131 }
3132 if (!(tcon->ses->capabilities & CAP_LARGE_READ_X))
3133 cifs_sb->rsize = min(cifs_sb->rsize,
3134 (tcon->ses->server->maxBuf - MAX_CIFS_HDR_SIZE));
3135
3136 cifs_sb->wsize = cifs_negotiate_wsize(tcon, volume_info);
3137
3138remote_path_check:
3139#ifdef CONFIG_CIFS_DFS_UPCALL
3140 /*
3141 * Perform an unconditional check for whether there are DFS
3142 * referrals for this path without prefix, to provide support
3143 * for DFS referrals from w2k8 servers which don't seem to respond
3144 * with PATH_NOT_COVERED to requests that include the prefix.
3145 * Chase the referral if found, otherwise continue normally.
3146 */
3147 if (referral_walks_count == 0) {
3148 int refrc = expand_dfs_referral(xid, pSesInfo, volume_info,
3149 cifs_sb, false);
3150 if (!refrc) {
3151 referral_walks_count++;
3152 goto try_mount_again;
3153 }
3154 }
3155#endif
3156
3157 /* check if a whole path is not remote */
3158 if (!rc && tcon) {
3159 /* build_path_to_root works only when we have a valid tcon */
3160 full_path = cifs_build_path_to_root(volume_info, cifs_sb, tcon);
3161 if (full_path == NULL) {
3162 rc = -ENOMEM;
3163 goto mount_fail_check;
3164 }
3165 rc = is_path_accessible(xid, tcon, cifs_sb, full_path);
3166 if (rc != 0 && rc != -EREMOTE) {
3167 kfree(full_path);
3168 goto mount_fail_check;
3169 }
3170 kfree(full_path);
3171 }
3172
3173 /* get referral if needed */
3174 if (rc == -EREMOTE) {
3175#ifdef CONFIG_CIFS_DFS_UPCALL
3176 if (referral_walks_count > MAX_NESTED_LINKS) {
3177 /*
3178 * BB: when we implement proper loop detection,
3179 * we will remove this check. But now we need it
3180 * to prevent an indefinite loop if 'DFS tree' is
3181 * misconfigured (i.e. has loops).
3182 */
3183 rc = -ELOOP;
3184 goto mount_fail_check;
3185 }
3186
3187 rc = expand_dfs_referral(xid, pSesInfo, volume_info, cifs_sb,
3188 true);
3189
3190 if (!rc) {
3191 referral_walks_count++;
3192 goto try_mount_again;
3193 }
3194 goto mount_fail_check;
3195#else /* No DFS support, return error on mount */
3196 rc = -EOPNOTSUPP;
3197#endif
3198 }
3199
3200 if (rc)
3201 goto mount_fail_check;
3202
3203 /* now, hang the tcon off of the superblock */
3204 tlink = kzalloc(sizeof *tlink, GFP_KERNEL);
3205 if (tlink == NULL) {
3206 rc = -ENOMEM;
3207 goto mount_fail_check;
3208 }
3209
3210 tlink->tl_uid = pSesInfo->linux_uid;
3211 tlink->tl_tcon = tcon;
3212 tlink->tl_time = jiffies;
3213 set_bit(TCON_LINK_MASTER, &tlink->tl_flags);
3214 set_bit(TCON_LINK_IN_TREE, &tlink->tl_flags);
3215
3216 cifs_sb->master_tlink = tlink;
3217 spin_lock(&cifs_sb->tlink_tree_lock);
3218 tlink_rb_insert(&cifs_sb->tlink_tree, tlink);
3219 spin_unlock(&cifs_sb->tlink_tree_lock);
3220
3221 queue_delayed_work(system_nrt_wq, &cifs_sb->prune_tlinks,
3222 TLINK_IDLE_EXPIRE);
3223
3224mount_fail_check:
3225 /* on error free sesinfo and tcon struct if needed */
3226 if (rc) {
3227 /* If find_unc succeeded then rc == 0 so we can not end */
3228 /* up accidentally freeing someone elses tcon struct */
3229 if (tcon)
3230 cifs_put_tcon(tcon);
3231 else if (pSesInfo)
3232 cifs_put_smb_ses(pSesInfo);
3233 else
3234 cifs_put_tcp_session(srvTcp);
3235 bdi_destroy(&cifs_sb->bdi);
3236 }
3237
3238out:
3239 FreeXid(xid);
3240 return rc;
3241}
3242
3243/*
3244 * Issue a TREE_CONNECT request. Note that for IPC$ shares, that the tcon
3245 * pointer may be NULL.
3246 */
3247int
3248CIFSTCon(unsigned int xid, struct cifs_ses *ses,
3249 const char *tree, struct cifs_tcon *tcon,
3250 const struct nls_table *nls_codepage)
3251{
3252 struct smb_hdr *smb_buffer;
3253 struct smb_hdr *smb_buffer_response;
3254 TCONX_REQ *pSMB;
3255 TCONX_RSP *pSMBr;
3256 unsigned char *bcc_ptr;
3257 int rc = 0;
3258 int length;
3259 __u16 bytes_left, count;
3260
3261 if (ses == NULL)
3262 return -EIO;
3263
3264 smb_buffer = cifs_buf_get();
3265 if (smb_buffer == NULL)
3266 return -ENOMEM;
3267
3268 smb_buffer_response = smb_buffer;
3269
3270 header_assemble(smb_buffer, SMB_COM_TREE_CONNECT_ANDX,
3271 NULL /*no tid */ , 4 /*wct */ );
3272
3273 smb_buffer->Mid = GetNextMid(ses->server);
3274 smb_buffer->Uid = ses->Suid;
3275 pSMB = (TCONX_REQ *) smb_buffer;
3276 pSMBr = (TCONX_RSP *) smb_buffer_response;
3277
3278 pSMB->AndXCommand = 0xFF;
3279 pSMB->Flags = cpu_to_le16(TCON_EXTENDED_SECINFO);
3280 bcc_ptr = &pSMB->Password[0];
3281 if (!tcon || (ses->server->sec_mode & SECMODE_USER)) {
3282 pSMB->PasswordLength = cpu_to_le16(1); /* minimum */
3283 *bcc_ptr = 0; /* password is null byte */
3284 bcc_ptr++; /* skip password */
3285 /* already aligned so no need to do it below */
3286 } else {
3287 pSMB->PasswordLength = cpu_to_le16(CIFS_AUTH_RESP_SIZE);
3288 /* BB FIXME add code to fail this if NTLMv2 or Kerberos
3289 specified as required (when that support is added to
3290 the vfs in the future) as only NTLM or the much
3291 weaker LANMAN (which we do not send by default) is accepted
3292 by Samba (not sure whether other servers allow
3293 NTLMv2 password here) */
3294#ifdef CONFIG_CIFS_WEAK_PW_HASH
3295 if ((global_secflags & CIFSSEC_MAY_LANMAN) &&
3296 (ses->server->secType == LANMAN))
3297 calc_lanman_hash(tcon->password, ses->server->cryptkey,
3298 ses->server->sec_mode &
3299 SECMODE_PW_ENCRYPT ? true : false,
3300 bcc_ptr);
3301 else
3302#endif /* CIFS_WEAK_PW_HASH */
3303 rc = SMBNTencrypt(tcon->password, ses->server->cryptkey,
3304 bcc_ptr);
3305
3306 bcc_ptr += CIFS_AUTH_RESP_SIZE;
3307 if (ses->capabilities & CAP_UNICODE) {
3308 /* must align unicode strings */
3309 *bcc_ptr = 0; /* null byte password */
3310 bcc_ptr++;
3311 }
3312 }
3313
3314 if (ses->server->sec_mode &
3315 (SECMODE_SIGN_REQUIRED | SECMODE_SIGN_ENABLED))
3316 smb_buffer->Flags2 |= SMBFLG2_SECURITY_SIGNATURE;
3317
3318 if (ses->capabilities & CAP_STATUS32) {
3319 smb_buffer->Flags2 |= SMBFLG2_ERR_STATUS;
3320 }
3321 if (ses->capabilities & CAP_DFS) {
3322 smb_buffer->Flags2 |= SMBFLG2_DFS;
3323 }
3324 if (ses->capabilities & CAP_UNICODE) {
3325 smb_buffer->Flags2 |= SMBFLG2_UNICODE;
3326 length =
3327 cifs_strtoUCS((__le16 *) bcc_ptr, tree,
3328 6 /* max utf8 char length in bytes */ *
3329 (/* server len*/ + 256 /* share len */), nls_codepage);
3330 bcc_ptr += 2 * length; /* convert num 16 bit words to bytes */
3331 bcc_ptr += 2; /* skip trailing null */
3332 } else { /* ASCII */
3333 strcpy(bcc_ptr, tree);
3334 bcc_ptr += strlen(tree) + 1;
3335 }
3336 strcpy(bcc_ptr, "?????");
3337 bcc_ptr += strlen("?????");
3338 bcc_ptr += 1;
3339 count = bcc_ptr - &pSMB->Password[0];
3340 pSMB->hdr.smb_buf_length = cpu_to_be32(be32_to_cpu(
3341 pSMB->hdr.smb_buf_length) + count);
3342 pSMB->ByteCount = cpu_to_le16(count);
3343
3344 rc = SendReceive(xid, ses, smb_buffer, smb_buffer_response, &length,
3345 0);
3346
3347 /* above now done in SendReceive */
3348 if ((rc == 0) && (tcon != NULL)) {
3349 bool is_unicode;
3350
3351 tcon->tidStatus = CifsGood;
3352 tcon->need_reconnect = false;
3353 tcon->tid = smb_buffer_response->Tid;
3354 bcc_ptr = pByteArea(smb_buffer_response);
3355 bytes_left = get_bcc(smb_buffer_response);
3356 length = strnlen(bcc_ptr, bytes_left - 2);
3357 if (smb_buffer->Flags2 & SMBFLG2_UNICODE)
3358 is_unicode = true;
3359 else
3360 is_unicode = false;
3361
3362
3363 /* skip service field (NB: this field is always ASCII) */
3364 if (length == 3) {
3365 if ((bcc_ptr[0] == 'I') && (bcc_ptr[1] == 'P') &&
3366 (bcc_ptr[2] == 'C')) {
3367 cFYI(1, "IPC connection");
3368 tcon->ipc = 1;
3369 }
3370 } else if (length == 2) {
3371 if ((bcc_ptr[0] == 'A') && (bcc_ptr[1] == ':')) {
3372 /* the most common case */
3373 cFYI(1, "disk share connection");
3374 }
3375 }
3376 bcc_ptr += length + 1;
3377 bytes_left -= (length + 1);
3378 strncpy(tcon->treeName, tree, MAX_TREE_SIZE);
3379
3380 /* mostly informational -- no need to fail on error here */
3381 kfree(tcon->nativeFileSystem);
3382 tcon->nativeFileSystem = cifs_strndup_from_ucs(bcc_ptr,
3383 bytes_left, is_unicode,
3384 nls_codepage);
3385
3386 cFYI(1, "nativeFileSystem=%s", tcon->nativeFileSystem);
3387
3388 if ((smb_buffer_response->WordCount == 3) ||
3389 (smb_buffer_response->WordCount == 7))
3390 /* field is in same location */
3391 tcon->Flags = le16_to_cpu(pSMBr->OptionalSupport);
3392 else
3393 tcon->Flags = 0;
3394 cFYI(1, "Tcon flags: 0x%x ", tcon->Flags);
3395 } else if ((rc == 0) && tcon == NULL) {
3396 /* all we need to save for IPC$ connection */
3397 ses->ipc_tid = smb_buffer_response->Tid;
3398 }
3399
3400 cifs_buf_release(smb_buffer);
3401 return rc;
3402}
3403
3404void
3405cifs_umount(struct cifs_sb_info *cifs_sb)
3406{
3407 struct rb_root *root = &cifs_sb->tlink_tree;
3408 struct rb_node *node;
3409 struct tcon_link *tlink;
3410
3411 cancel_delayed_work_sync(&cifs_sb->prune_tlinks);
3412
3413 spin_lock(&cifs_sb->tlink_tree_lock);
3414 while ((node = rb_first(root))) {
3415 tlink = rb_entry(node, struct tcon_link, tl_rbnode);
3416 cifs_get_tlink(tlink);
3417 clear_bit(TCON_LINK_IN_TREE, &tlink->tl_flags);
3418 rb_erase(node, root);
3419
3420 spin_unlock(&cifs_sb->tlink_tree_lock);
3421 cifs_put_tlink(tlink);
3422 spin_lock(&cifs_sb->tlink_tree_lock);
3423 }
3424 spin_unlock(&cifs_sb->tlink_tree_lock);
3425
3426 bdi_destroy(&cifs_sb->bdi);
3427 kfree(cifs_sb->mountdata);
3428 unload_nls(cifs_sb->local_nls);
3429 kfree(cifs_sb);
3430}
3431
3432int cifs_negotiate_protocol(unsigned int xid, struct cifs_ses *ses)
3433{
3434 int rc = 0;
3435 struct TCP_Server_Info *server = ses->server;
3436
3437 /* only send once per connect */
3438 if (server->maxBuf != 0)
3439 return 0;
3440
3441 rc = CIFSSMBNegotiate(xid, ses);
3442 if (rc == -EAGAIN) {
3443 /* retry only once on 1st time connection */
3444 rc = CIFSSMBNegotiate(xid, ses);
3445 if (rc == -EAGAIN)
3446 rc = -EHOSTDOWN;
3447 }
3448 if (rc == 0) {
3449 spin_lock(&GlobalMid_Lock);
3450 if (server->tcpStatus == CifsNeedNegotiate)
3451 server->tcpStatus = CifsGood;
3452 else
3453 rc = -EHOSTDOWN;
3454 spin_unlock(&GlobalMid_Lock);
3455
3456 }
3457
3458 return rc;
3459}
3460
3461
3462int cifs_setup_session(unsigned int xid, struct cifs_ses *ses,
3463 struct nls_table *nls_info)
3464{
3465 int rc = 0;
3466 struct TCP_Server_Info *server = ses->server;
3467
3468 ses->flags = 0;
3469 ses->capabilities = server->capabilities;
3470 if (linuxExtEnabled == 0)
3471 ses->capabilities &= (~CAP_UNIX);
3472
3473 cFYI(1, "Security Mode: 0x%x Capabilities: 0x%x TimeAdjust: %d",
3474 server->sec_mode, server->capabilities, server->timeAdj);
3475
3476 rc = CIFS_SessSetup(xid, ses, nls_info);
3477 if (rc) {
3478 cERROR(1, "Send error in SessSetup = %d", rc);
3479 } else {
3480 mutex_lock(&ses->server->srv_mutex);
3481 if (!server->session_estab) {
3482 server->session_key.response = ses->auth_key.response;
3483 server->session_key.len = ses->auth_key.len;
3484 server->sequence_number = 0x2;
3485 server->session_estab = true;
3486 ses->auth_key.response = NULL;
3487 }
3488 mutex_unlock(&server->srv_mutex);
3489
3490 cFYI(1, "CIFS Session Established successfully");
3491 spin_lock(&GlobalMid_Lock);
3492 ses->status = CifsGood;
3493 ses->need_reconnect = false;
3494 spin_unlock(&GlobalMid_Lock);
3495 }
3496
3497 kfree(ses->auth_key.response);
3498 ses->auth_key.response = NULL;
3499 ses->auth_key.len = 0;
3500 kfree(ses->ntlmssp);
3501 ses->ntlmssp = NULL;
3502
3503 return rc;
3504}
3505
3506static struct cifs_tcon *
3507cifs_construct_tcon(struct cifs_sb_info *cifs_sb, uid_t fsuid)
3508{
3509 struct cifs_tcon *master_tcon = cifs_sb_master_tcon(cifs_sb);
3510 struct cifs_ses *ses;
3511 struct cifs_tcon *tcon = NULL;
3512 struct smb_vol *vol_info;
3513 char username[28]; /* big enough for "krb50x" + hex of ULONG_MAX 6+16 */
3514 /* We used to have this as MAX_USERNAME which is */
3515 /* way too big now (256 instead of 32) */
3516
3517 vol_info = kzalloc(sizeof(*vol_info), GFP_KERNEL);
3518 if (vol_info == NULL) {
3519 tcon = ERR_PTR(-ENOMEM);
3520 goto out;
3521 }
3522
3523 snprintf(username, sizeof(username), "krb50x%x", fsuid);
3524 vol_info->username = username;
3525 vol_info->local_nls = cifs_sb->local_nls;
3526 vol_info->linux_uid = fsuid;
3527 vol_info->cred_uid = fsuid;
3528 vol_info->UNC = master_tcon->treeName;
3529 vol_info->retry = master_tcon->retry;
3530 vol_info->nocase = master_tcon->nocase;
3531 vol_info->local_lease = master_tcon->local_lease;
3532 vol_info->no_linux_ext = !master_tcon->unix_ext;
3533
3534 /* FIXME: allow for other secFlg settings */
3535 vol_info->secFlg = CIFSSEC_MUST_KRB5;
3536
3537 /* get a reference for the same TCP session */
3538 spin_lock(&cifs_tcp_ses_lock);
3539 ++master_tcon->ses->server->srv_count;
3540 spin_unlock(&cifs_tcp_ses_lock);
3541
3542 ses = cifs_get_smb_ses(master_tcon->ses->server, vol_info);
3543 if (IS_ERR(ses)) {
3544 tcon = (struct cifs_tcon *)ses;
3545 cifs_put_tcp_session(master_tcon->ses->server);
3546 goto out;
3547 }
3548
3549 tcon = cifs_get_tcon(ses, vol_info);
3550 if (IS_ERR(tcon)) {
3551 cifs_put_smb_ses(ses);
3552 goto out;
3553 }
3554
3555 if (ses->capabilities & CAP_UNIX)
3556 reset_cifs_unix_caps(0, tcon, NULL, vol_info);
3557out:
3558 kfree(vol_info);
3559
3560 return tcon;
3561}
3562
3563struct cifs_tcon *
3564cifs_sb_master_tcon(struct cifs_sb_info *cifs_sb)
3565{
3566 return tlink_tcon(cifs_sb_master_tlink(cifs_sb));
3567}
3568
3569static int
3570cifs_sb_tcon_pending_wait(void *unused)
3571{
3572 schedule();
3573 return signal_pending(current) ? -ERESTARTSYS : 0;
3574}
3575
3576/* find and return a tlink with given uid */
3577static struct tcon_link *
3578tlink_rb_search(struct rb_root *root, uid_t uid)
3579{
3580 struct rb_node *node = root->rb_node;
3581 struct tcon_link *tlink;
3582
3583 while (node) {
3584 tlink = rb_entry(node, struct tcon_link, tl_rbnode);
3585
3586 if (tlink->tl_uid > uid)
3587 node = node->rb_left;
3588 else if (tlink->tl_uid < uid)
3589 node = node->rb_right;
3590 else
3591 return tlink;
3592 }
3593 return NULL;
3594}
3595
3596/* insert a tcon_link into the tree */
3597static void
3598tlink_rb_insert(struct rb_root *root, struct tcon_link *new_tlink)
3599{
3600 struct rb_node **new = &(root->rb_node), *parent = NULL;
3601 struct tcon_link *tlink;
3602
3603 while (*new) {
3604 tlink = rb_entry(*new, struct tcon_link, tl_rbnode);
3605 parent = *new;
3606
3607 if (tlink->tl_uid > new_tlink->tl_uid)
3608 new = &((*new)->rb_left);
3609 else
3610 new = &((*new)->rb_right);
3611 }
3612
3613 rb_link_node(&new_tlink->tl_rbnode, parent, new);
3614 rb_insert_color(&new_tlink->tl_rbnode, root);
3615}
3616
3617/*
3618 * Find or construct an appropriate tcon given a cifs_sb and the fsuid of the
3619 * current task.
3620 *
3621 * If the superblock doesn't refer to a multiuser mount, then just return
3622 * the master tcon for the mount.
3623 *
3624 * First, search the rbtree for an existing tcon for this fsuid. If one
3625 * exists, then check to see if it's pending construction. If it is then wait
3626 * for construction to complete. Once it's no longer pending, check to see if
3627 * it failed and either return an error or retry construction, depending on
3628 * the timeout.
3629 *
3630 * If one doesn't exist then insert a new tcon_link struct into the tree and
3631 * try to construct a new one.
3632 */
3633struct tcon_link *
3634cifs_sb_tlink(struct cifs_sb_info *cifs_sb)
3635{
3636 int ret;
3637 uid_t fsuid = current_fsuid();
3638 struct tcon_link *tlink, *newtlink;
3639
3640 if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MULTIUSER))
3641 return cifs_get_tlink(cifs_sb_master_tlink(cifs_sb));
3642
3643 spin_lock(&cifs_sb->tlink_tree_lock);
3644 tlink = tlink_rb_search(&cifs_sb->tlink_tree, fsuid);
3645 if (tlink)
3646 cifs_get_tlink(tlink);
3647 spin_unlock(&cifs_sb->tlink_tree_lock);
3648
3649 if (tlink == NULL) {
3650 newtlink = kzalloc(sizeof(*tlink), GFP_KERNEL);
3651 if (newtlink == NULL)
3652 return ERR_PTR(-ENOMEM);
3653 newtlink->tl_uid = fsuid;
3654 newtlink->tl_tcon = ERR_PTR(-EACCES);
3655 set_bit(TCON_LINK_PENDING, &newtlink->tl_flags);
3656 set_bit(TCON_LINK_IN_TREE, &newtlink->tl_flags);
3657 cifs_get_tlink(newtlink);
3658
3659 spin_lock(&cifs_sb->tlink_tree_lock);
3660 /* was one inserted after previous search? */
3661 tlink = tlink_rb_search(&cifs_sb->tlink_tree, fsuid);
3662 if (tlink) {
3663 cifs_get_tlink(tlink);
3664 spin_unlock(&cifs_sb->tlink_tree_lock);
3665 kfree(newtlink);
3666 goto wait_for_construction;
3667 }
3668 tlink = newtlink;
3669 tlink_rb_insert(&cifs_sb->tlink_tree, tlink);
3670 spin_unlock(&cifs_sb->tlink_tree_lock);
3671 } else {
3672wait_for_construction:
3673 ret = wait_on_bit(&tlink->tl_flags, TCON_LINK_PENDING,
3674 cifs_sb_tcon_pending_wait,
3675 TASK_INTERRUPTIBLE);
3676 if (ret) {
3677 cifs_put_tlink(tlink);
3678 return ERR_PTR(ret);
3679 }
3680
3681 /* if it's good, return it */
3682 if (!IS_ERR(tlink->tl_tcon))
3683 return tlink;
3684
3685 /* return error if we tried this already recently */
3686 if (time_before(jiffies, tlink->tl_time + TLINK_ERROR_EXPIRE)) {
3687 cifs_put_tlink(tlink);
3688 return ERR_PTR(-EACCES);
3689 }
3690
3691 if (test_and_set_bit(TCON_LINK_PENDING, &tlink->tl_flags))
3692 goto wait_for_construction;
3693 }
3694
3695 tlink->tl_tcon = cifs_construct_tcon(cifs_sb, fsuid);
3696 clear_bit(TCON_LINK_PENDING, &tlink->tl_flags);
3697 wake_up_bit(&tlink->tl_flags, TCON_LINK_PENDING);
3698
3699 if (IS_ERR(tlink->tl_tcon)) {
3700 cifs_put_tlink(tlink);
3701 return ERR_PTR(-EACCES);
3702 }
3703
3704 return tlink;
3705}
3706
3707/*
3708 * periodic workqueue job that scans tcon_tree for a superblock and closes
3709 * out tcons.
3710 */
3711static void
3712cifs_prune_tlinks(struct work_struct *work)
3713{
3714 struct cifs_sb_info *cifs_sb = container_of(work, struct cifs_sb_info,
3715 prune_tlinks.work);
3716 struct rb_root *root = &cifs_sb->tlink_tree;
3717 struct rb_node *node = rb_first(root);
3718 struct rb_node *tmp;
3719 struct tcon_link *tlink;
3720
3721 /*
3722 * Because we drop the spinlock in the loop in order to put the tlink
3723 * it's not guarded against removal of links from the tree. The only
3724 * places that remove entries from the tree are this function and
3725 * umounts. Because this function is non-reentrant and is canceled
3726 * before umount can proceed, this is safe.
3727 */
3728 spin_lock(&cifs_sb->tlink_tree_lock);
3729 node = rb_first(root);
3730 while (node != NULL) {
3731 tmp = node;
3732 node = rb_next(tmp);
3733 tlink = rb_entry(tmp, struct tcon_link, tl_rbnode);
3734
3735 if (test_bit(TCON_LINK_MASTER, &tlink->tl_flags) ||
3736 atomic_read(&tlink->tl_count) != 0 ||
3737 time_after(tlink->tl_time + TLINK_IDLE_EXPIRE, jiffies))
3738 continue;
3739
3740 cifs_get_tlink(tlink);
3741 clear_bit(TCON_LINK_IN_TREE, &tlink->tl_flags);
3742 rb_erase(tmp, root);
3743
3744 spin_unlock(&cifs_sb->tlink_tree_lock);
3745 cifs_put_tlink(tlink);
3746 spin_lock(&cifs_sb->tlink_tree_lock);
3747 }
3748 spin_unlock(&cifs_sb->tlink_tree_lock);
3749
3750 queue_delayed_work(system_nrt_wq, &cifs_sb->prune_tlinks,
3751 TLINK_IDLE_EXPIRE);
3752}
1// SPDX-License-Identifier: LGPL-2.1
2/*
3 * fs/cifs/connect.c
4 *
5 * Copyright (C) International Business Machines Corp., 2002,2011
6 * Author(s): Steve French (sfrench@us.ibm.com)
7 *
8 */
9#include <linux/fs.h>
10#include <linux/net.h>
11#include <linux/string.h>
12#include <linux/sched/mm.h>
13#include <linux/sched/signal.h>
14#include <linux/list.h>
15#include <linux/wait.h>
16#include <linux/slab.h>
17#include <linux/pagemap.h>
18#include <linux/ctype.h>
19#include <linux/utsname.h>
20#include <linux/mempool.h>
21#include <linux/delay.h>
22#include <linux/completion.h>
23#include <linux/kthread.h>
24#include <linux/pagevec.h>
25#include <linux/freezer.h>
26#include <linux/namei.h>
27#include <linux/uuid.h>
28#include <linux/uaccess.h>
29#include <asm/processor.h>
30#include <linux/inet.h>
31#include <linux/module.h>
32#include <keys/user-type.h>
33#include <net/ipv6.h>
34#include <linux/parser.h>
35#include <linux/bvec.h>
36#include "cifspdu.h"
37#include "cifsglob.h"
38#include "cifsproto.h"
39#include "cifs_unicode.h"
40#include "cifs_debug.h"
41#include "cifs_fs_sb.h"
42#include "ntlmssp.h"
43#include "nterr.h"
44#include "rfc1002pdu.h"
45#include "fscache.h"
46#include "smb2proto.h"
47#include "smbdirect.h"
48#include "dns_resolve.h"
49#ifdef CONFIG_CIFS_DFS_UPCALL
50#include "dfs_cache.h"
51#endif
52#include "fs_context.h"
53#include "cifs_swn.h"
54
55extern mempool_t *cifs_req_poolp;
56extern bool disable_legacy_dialects;
57
58/* FIXME: should these be tunable? */
59#define TLINK_ERROR_EXPIRE (1 * HZ)
60#define TLINK_IDLE_EXPIRE (600 * HZ)
61
62/* Drop the connection to not overload the server */
63#define NUM_STATUS_IO_TIMEOUT 5
64
65static int ip_connect(struct TCP_Server_Info *server);
66static int generic_ip_connect(struct TCP_Server_Info *server);
67static void tlink_rb_insert(struct rb_root *root, struct tcon_link *new_tlink);
68static void cifs_prune_tlinks(struct work_struct *work);
69
70/*
71 * Resolve hostname and set ip addr in tcp ses. Useful for hostnames that may
72 * get their ip addresses changed at some point.
73 *
74 * This should be called with server->srv_mutex held.
75 */
76static int reconn_set_ipaddr_from_hostname(struct TCP_Server_Info *server)
77{
78 int rc;
79 int len;
80 char *unc, *ipaddr = NULL;
81 time64_t expiry, now;
82 unsigned long ttl = SMB_DNS_RESOLVE_INTERVAL_DEFAULT;
83
84 if (!server->hostname)
85 return -EINVAL;
86
87 len = strlen(server->hostname) + 3;
88
89 unc = kmalloc(len, GFP_KERNEL);
90 if (!unc) {
91 cifs_dbg(FYI, "%s: failed to create UNC path\n", __func__);
92 return -ENOMEM;
93 }
94 scnprintf(unc, len, "\\\\%s", server->hostname);
95
96 rc = dns_resolve_server_name_to_ip(unc, &ipaddr, &expiry);
97 kfree(unc);
98
99 if (rc < 0) {
100 cifs_dbg(FYI, "%s: failed to resolve server part of %s to IP: %d\n",
101 __func__, server->hostname, rc);
102 goto requeue_resolve;
103 }
104
105 spin_lock(&cifs_tcp_ses_lock);
106 rc = cifs_convert_address((struct sockaddr *)&server->dstaddr, ipaddr,
107 strlen(ipaddr));
108 spin_unlock(&cifs_tcp_ses_lock);
109 kfree(ipaddr);
110
111 /* rc == 1 means success here */
112 if (rc) {
113 now = ktime_get_real_seconds();
114 if (expiry && expiry > now)
115 /*
116 * To make sure we don't use the cached entry, retry 1s
117 * after expiry.
118 */
119 ttl = (expiry - now + 1);
120 }
121 rc = !rc ? -1 : 0;
122
123requeue_resolve:
124 cifs_dbg(FYI, "%s: next dns resolution scheduled for %lu seconds in the future\n",
125 __func__, ttl);
126 mod_delayed_work(cifsiod_wq, &server->resolve, (ttl * HZ));
127
128 return rc;
129}
130
131
132static void cifs_resolve_server(struct work_struct *work)
133{
134 int rc;
135 struct TCP_Server_Info *server = container_of(work,
136 struct TCP_Server_Info, resolve.work);
137
138 mutex_lock(&server->srv_mutex);
139
140 /*
141 * Resolve the hostname again to make sure that IP address is up-to-date.
142 */
143 rc = reconn_set_ipaddr_from_hostname(server);
144 if (rc) {
145 cifs_dbg(FYI, "%s: failed to resolve hostname: %d\n",
146 __func__, rc);
147 }
148
149 mutex_unlock(&server->srv_mutex);
150}
151
152#ifdef CONFIG_CIFS_DFS_UPCALL
153/* These functions must be called with server->srv_mutex held */
154static void reconn_set_next_dfs_target(struct TCP_Server_Info *server,
155 struct cifs_sb_info *cifs_sb,
156 struct dfs_cache_tgt_list *tgt_list,
157 struct dfs_cache_tgt_iterator **tgt_it)
158{
159 const char *name;
160 int rc;
161
162 if (!cifs_sb || !cifs_sb->origin_fullpath)
163 return;
164
165 if (!*tgt_it) {
166 *tgt_it = dfs_cache_get_tgt_iterator(tgt_list);
167 } else {
168 *tgt_it = dfs_cache_get_next_tgt(tgt_list, *tgt_it);
169 if (!*tgt_it)
170 *tgt_it = dfs_cache_get_tgt_iterator(tgt_list);
171 }
172
173 cifs_dbg(FYI, "%s: UNC: %s\n", __func__, cifs_sb->origin_fullpath);
174
175 name = dfs_cache_get_tgt_name(*tgt_it);
176
177 kfree(server->hostname);
178
179 server->hostname = extract_hostname(name);
180 if (IS_ERR(server->hostname)) {
181 cifs_dbg(FYI,
182 "%s: failed to extract hostname from target: %ld\n",
183 __func__, PTR_ERR(server->hostname));
184 return;
185 }
186
187 rc = reconn_set_ipaddr_from_hostname(server);
188 if (rc) {
189 cifs_dbg(FYI, "%s: failed to resolve hostname: %d\n",
190 __func__, rc);
191 }
192}
193
194static inline int reconn_setup_dfs_targets(struct cifs_sb_info *cifs_sb,
195 struct dfs_cache_tgt_list *tl)
196{
197 if (!cifs_sb->origin_fullpath)
198 return -EOPNOTSUPP;
199 return dfs_cache_noreq_find(cifs_sb->origin_fullpath + 1, NULL, tl);
200}
201#endif
202
203/*
204 * cifs tcp session reconnection
205 *
206 * mark tcp session as reconnecting so temporarily locked
207 * mark all smb sessions as reconnecting for tcp session
208 * reconnect tcp session
209 * wake up waiters on reconnection? - (not needed currently)
210 */
211int
212cifs_reconnect(struct TCP_Server_Info *server)
213{
214 int rc = 0;
215 struct list_head *tmp, *tmp2;
216 struct cifs_ses *ses;
217 struct cifs_tcon *tcon;
218 struct mid_q_entry *mid_entry;
219 struct list_head retry_list;
220#ifdef CONFIG_CIFS_DFS_UPCALL
221 struct super_block *sb = NULL;
222 struct cifs_sb_info *cifs_sb = NULL;
223 struct dfs_cache_tgt_list tgt_list = DFS_CACHE_TGT_LIST_INIT(tgt_list);
224 struct dfs_cache_tgt_iterator *tgt_it = NULL;
225#endif
226
227 spin_lock(&GlobalMid_Lock);
228 server->nr_targets = 1;
229#ifdef CONFIG_CIFS_DFS_UPCALL
230 spin_unlock(&GlobalMid_Lock);
231 sb = cifs_get_tcp_super(server);
232 if (IS_ERR(sb)) {
233 rc = PTR_ERR(sb);
234 cifs_dbg(FYI, "%s: will not do DFS failover: rc = %d\n",
235 __func__, rc);
236 sb = NULL;
237 } else {
238 cifs_sb = CIFS_SB(sb);
239 rc = reconn_setup_dfs_targets(cifs_sb, &tgt_list);
240 if (rc) {
241 cifs_sb = NULL;
242 if (rc != -EOPNOTSUPP) {
243 cifs_server_dbg(VFS, "%s: no target servers for DFS failover\n",
244 __func__);
245 }
246 } else {
247 server->nr_targets = dfs_cache_get_nr_tgts(&tgt_list);
248 }
249 }
250 cifs_dbg(FYI, "%s: will retry %d target(s)\n", __func__,
251 server->nr_targets);
252 spin_lock(&GlobalMid_Lock);
253#endif
254 if (server->tcpStatus == CifsExiting) {
255 /* the demux thread will exit normally
256 next time through the loop */
257 spin_unlock(&GlobalMid_Lock);
258#ifdef CONFIG_CIFS_DFS_UPCALL
259 dfs_cache_free_tgts(&tgt_list);
260 cifs_put_tcp_super(sb);
261#endif
262 wake_up(&server->response_q);
263 return rc;
264 } else
265 server->tcpStatus = CifsNeedReconnect;
266 spin_unlock(&GlobalMid_Lock);
267 server->maxBuf = 0;
268 server->max_read = 0;
269
270 cifs_dbg(FYI, "Mark tcp session as need reconnect\n");
271 trace_smb3_reconnect(server->CurrentMid, server->conn_id, server->hostname);
272
273 /* before reconnecting the tcp session, mark the smb session (uid)
274 and the tid bad so they are not used until reconnected */
275 cifs_dbg(FYI, "%s: marking sessions and tcons for reconnect\n",
276 __func__);
277 spin_lock(&cifs_tcp_ses_lock);
278 list_for_each(tmp, &server->smb_ses_list) {
279 ses = list_entry(tmp, struct cifs_ses, smb_ses_list);
280 ses->need_reconnect = true;
281 list_for_each(tmp2, &ses->tcon_list) {
282 tcon = list_entry(tmp2, struct cifs_tcon, tcon_list);
283 tcon->need_reconnect = true;
284 }
285 if (ses->tcon_ipc)
286 ses->tcon_ipc->need_reconnect = true;
287 }
288 spin_unlock(&cifs_tcp_ses_lock);
289
290 /* do not want to be sending data on a socket we are freeing */
291 cifs_dbg(FYI, "%s: tearing down socket\n", __func__);
292 mutex_lock(&server->srv_mutex);
293 if (server->ssocket) {
294 cifs_dbg(FYI, "State: 0x%x Flags: 0x%lx\n",
295 server->ssocket->state, server->ssocket->flags);
296 kernel_sock_shutdown(server->ssocket, SHUT_WR);
297 cifs_dbg(FYI, "Post shutdown state: 0x%x Flags: 0x%lx\n",
298 server->ssocket->state, server->ssocket->flags);
299 sock_release(server->ssocket);
300 server->ssocket = NULL;
301 }
302 server->sequence_number = 0;
303 server->session_estab = false;
304 kfree(server->session_key.response);
305 server->session_key.response = NULL;
306 server->session_key.len = 0;
307 server->lstrp = jiffies;
308
309 /* mark submitted MIDs for retry and issue callback */
310 INIT_LIST_HEAD(&retry_list);
311 cifs_dbg(FYI, "%s: moving mids to private list\n", __func__);
312 spin_lock(&GlobalMid_Lock);
313 list_for_each_safe(tmp, tmp2, &server->pending_mid_q) {
314 mid_entry = list_entry(tmp, struct mid_q_entry, qhead);
315 kref_get(&mid_entry->refcount);
316 if (mid_entry->mid_state == MID_REQUEST_SUBMITTED)
317 mid_entry->mid_state = MID_RETRY_NEEDED;
318 list_move(&mid_entry->qhead, &retry_list);
319 mid_entry->mid_flags |= MID_DELETED;
320 }
321 spin_unlock(&GlobalMid_Lock);
322 mutex_unlock(&server->srv_mutex);
323
324 cifs_dbg(FYI, "%s: issuing mid callbacks\n", __func__);
325 list_for_each_safe(tmp, tmp2, &retry_list) {
326 mid_entry = list_entry(tmp, struct mid_q_entry, qhead);
327 list_del_init(&mid_entry->qhead);
328 mid_entry->callback(mid_entry);
329 cifs_mid_q_entry_release(mid_entry);
330 }
331
332 if (cifs_rdma_enabled(server)) {
333 mutex_lock(&server->srv_mutex);
334 smbd_destroy(server);
335 mutex_unlock(&server->srv_mutex);
336 }
337
338 do {
339 try_to_freeze();
340
341 mutex_lock(&server->srv_mutex);
342
343
344 if (!cifs_swn_set_server_dstaddr(server)) {
345#ifdef CONFIG_CIFS_DFS_UPCALL
346 if (cifs_sb && cifs_sb->origin_fullpath)
347 /*
348 * Set up next DFS target server (if any) for reconnect. If DFS
349 * feature is disabled, then we will retry last server we
350 * connected to before.
351 */
352 reconn_set_next_dfs_target(server, cifs_sb, &tgt_list, &tgt_it);
353 else {
354#endif
355 /*
356 * Resolve the hostname again to make sure that IP address is up-to-date.
357 */
358 rc = reconn_set_ipaddr_from_hostname(server);
359 if (rc) {
360 cifs_dbg(FYI, "%s: failed to resolve hostname: %d\n",
361 __func__, rc);
362 }
363
364#ifdef CONFIG_CIFS_DFS_UPCALL
365 }
366#endif
367
368
369 }
370
371 if (cifs_rdma_enabled(server))
372 rc = smbd_reconnect(server);
373 else
374 rc = generic_ip_connect(server);
375 if (rc) {
376 cifs_dbg(FYI, "reconnect error %d\n", rc);
377 mutex_unlock(&server->srv_mutex);
378 msleep(3000);
379 } else {
380 atomic_inc(&tcpSesReconnectCount);
381 set_credits(server, 1);
382 spin_lock(&GlobalMid_Lock);
383 if (server->tcpStatus != CifsExiting)
384 server->tcpStatus = CifsNeedNegotiate;
385 spin_unlock(&GlobalMid_Lock);
386 cifs_swn_reset_server_dstaddr(server);
387 mutex_unlock(&server->srv_mutex);
388 }
389 } while (server->tcpStatus == CifsNeedReconnect);
390
391#ifdef CONFIG_CIFS_DFS_UPCALL
392 if (tgt_it) {
393 rc = dfs_cache_noreq_update_tgthint(cifs_sb->origin_fullpath + 1,
394 tgt_it);
395 if (rc) {
396 cifs_server_dbg(VFS, "%s: failed to update DFS target hint: rc = %d\n",
397 __func__, rc);
398 }
399 dfs_cache_free_tgts(&tgt_list);
400 }
401
402 cifs_put_tcp_super(sb);
403#endif
404 if (server->tcpStatus == CifsNeedNegotiate)
405 mod_delayed_work(cifsiod_wq, &server->echo, 0);
406
407 wake_up(&server->response_q);
408 return rc;
409}
410
411static void
412cifs_echo_request(struct work_struct *work)
413{
414 int rc;
415 struct TCP_Server_Info *server = container_of(work,
416 struct TCP_Server_Info, echo.work);
417
418 /*
419 * We cannot send an echo if it is disabled.
420 * Also, no need to ping if we got a response recently.
421 */
422
423 if (server->tcpStatus == CifsNeedReconnect ||
424 server->tcpStatus == CifsExiting ||
425 server->tcpStatus == CifsNew ||
426 (server->ops->can_echo && !server->ops->can_echo(server)) ||
427 time_before(jiffies, server->lstrp + server->echo_interval - HZ))
428 goto requeue_echo;
429
430 rc = server->ops->echo ? server->ops->echo(server) : -ENOSYS;
431 if (rc)
432 cifs_dbg(FYI, "Unable to send echo request to server: %s\n",
433 server->hostname);
434
435 /* Check witness registrations */
436 cifs_swn_check();
437
438requeue_echo:
439 queue_delayed_work(cifsiod_wq, &server->echo, server->echo_interval);
440}
441
442static bool
443allocate_buffers(struct TCP_Server_Info *server)
444{
445 if (!server->bigbuf) {
446 server->bigbuf = (char *)cifs_buf_get();
447 if (!server->bigbuf) {
448 cifs_server_dbg(VFS, "No memory for large SMB response\n");
449 msleep(3000);
450 /* retry will check if exiting */
451 return false;
452 }
453 } else if (server->large_buf) {
454 /* we are reusing a dirty large buf, clear its start */
455 memset(server->bigbuf, 0, HEADER_SIZE(server));
456 }
457
458 if (!server->smallbuf) {
459 server->smallbuf = (char *)cifs_small_buf_get();
460 if (!server->smallbuf) {
461 cifs_server_dbg(VFS, "No memory for SMB response\n");
462 msleep(1000);
463 /* retry will check if exiting */
464 return false;
465 }
466 /* beginning of smb buffer is cleared in our buf_get */
467 } else {
468 /* if existing small buf clear beginning */
469 memset(server->smallbuf, 0, HEADER_SIZE(server));
470 }
471
472 return true;
473}
474
475static bool
476server_unresponsive(struct TCP_Server_Info *server)
477{
478 /*
479 * We need to wait 3 echo intervals to make sure we handle such
480 * situations right:
481 * 1s client sends a normal SMB request
482 * 2s client gets a response
483 * 30s echo workqueue job pops, and decides we got a response recently
484 * and don't need to send another
485 * ...
486 * 65s kernel_recvmsg times out, and we see that we haven't gotten
487 * a response in >60s.
488 */
489 if ((server->tcpStatus == CifsGood ||
490 server->tcpStatus == CifsNeedNegotiate) &&
491 (!server->ops->can_echo || server->ops->can_echo(server)) &&
492 time_after(jiffies, server->lstrp + 3 * server->echo_interval)) {
493 cifs_server_dbg(VFS, "has not responded in %lu seconds. Reconnecting...\n",
494 (3 * server->echo_interval) / HZ);
495 cifs_reconnect(server);
496 return true;
497 }
498
499 return false;
500}
501
502static inline bool
503zero_credits(struct TCP_Server_Info *server)
504{
505 int val;
506
507 spin_lock(&server->req_lock);
508 val = server->credits + server->echo_credits + server->oplock_credits;
509 if (server->in_flight == 0 && val == 0) {
510 spin_unlock(&server->req_lock);
511 return true;
512 }
513 spin_unlock(&server->req_lock);
514 return false;
515}
516
517static int
518cifs_readv_from_socket(struct TCP_Server_Info *server, struct msghdr *smb_msg)
519{
520 int length = 0;
521 int total_read;
522
523 smb_msg->msg_control = NULL;
524 smb_msg->msg_controllen = 0;
525
526 for (total_read = 0; msg_data_left(smb_msg); total_read += length) {
527 try_to_freeze();
528
529 /* reconnect if no credits and no requests in flight */
530 if (zero_credits(server)) {
531 cifs_reconnect(server);
532 return -ECONNABORTED;
533 }
534
535 if (server_unresponsive(server))
536 return -ECONNABORTED;
537 if (cifs_rdma_enabled(server) && server->smbd_conn)
538 length = smbd_recv(server->smbd_conn, smb_msg);
539 else
540 length = sock_recvmsg(server->ssocket, smb_msg, 0);
541
542 if (server->tcpStatus == CifsExiting)
543 return -ESHUTDOWN;
544
545 if (server->tcpStatus == CifsNeedReconnect) {
546 cifs_reconnect(server);
547 return -ECONNABORTED;
548 }
549
550 if (length == -ERESTARTSYS ||
551 length == -EAGAIN ||
552 length == -EINTR) {
553 /*
554 * Minimum sleep to prevent looping, allowing socket
555 * to clear and app threads to set tcpStatus
556 * CifsNeedReconnect if server hung.
557 */
558 usleep_range(1000, 2000);
559 length = 0;
560 continue;
561 }
562
563 if (length <= 0) {
564 cifs_dbg(FYI, "Received no data or error: %d\n", length);
565 cifs_reconnect(server);
566 return -ECONNABORTED;
567 }
568 }
569 return total_read;
570}
571
572int
573cifs_read_from_socket(struct TCP_Server_Info *server, char *buf,
574 unsigned int to_read)
575{
576 struct msghdr smb_msg;
577 struct kvec iov = {.iov_base = buf, .iov_len = to_read};
578 iov_iter_kvec(&smb_msg.msg_iter, READ, &iov, 1, to_read);
579
580 return cifs_readv_from_socket(server, &smb_msg);
581}
582
583ssize_t
584cifs_discard_from_socket(struct TCP_Server_Info *server, size_t to_read)
585{
586 struct msghdr smb_msg;
587
588 /*
589 * iov_iter_discard already sets smb_msg.type and count and iov_offset
590 * and cifs_readv_from_socket sets msg_control and msg_controllen
591 * so little to initialize in struct msghdr
592 */
593 smb_msg.msg_name = NULL;
594 smb_msg.msg_namelen = 0;
595 iov_iter_discard(&smb_msg.msg_iter, READ, to_read);
596
597 return cifs_readv_from_socket(server, &smb_msg);
598}
599
600int
601cifs_read_page_from_socket(struct TCP_Server_Info *server, struct page *page,
602 unsigned int page_offset, unsigned int to_read)
603{
604 struct msghdr smb_msg;
605 struct bio_vec bv = {
606 .bv_page = page, .bv_len = to_read, .bv_offset = page_offset};
607 iov_iter_bvec(&smb_msg.msg_iter, READ, &bv, 1, to_read);
608 return cifs_readv_from_socket(server, &smb_msg);
609}
610
611static bool
612is_smb_response(struct TCP_Server_Info *server, unsigned char type)
613{
614 /*
615 * The first byte big endian of the length field,
616 * is actually not part of the length but the type
617 * with the most common, zero, as regular data.
618 */
619 switch (type) {
620 case RFC1002_SESSION_MESSAGE:
621 /* Regular SMB response */
622 return true;
623 case RFC1002_SESSION_KEEP_ALIVE:
624 cifs_dbg(FYI, "RFC 1002 session keep alive\n");
625 break;
626 case RFC1002_POSITIVE_SESSION_RESPONSE:
627 cifs_dbg(FYI, "RFC 1002 positive session response\n");
628 break;
629 case RFC1002_NEGATIVE_SESSION_RESPONSE:
630 /*
631 * We get this from Windows 98 instead of an error on
632 * SMB negprot response.
633 */
634 cifs_dbg(FYI, "RFC 1002 negative session response\n");
635 /* give server a second to clean up */
636 msleep(1000);
637 /*
638 * Always try 445 first on reconnect since we get NACK
639 * on some if we ever connected to port 139 (the NACK
640 * is since we do not begin with RFC1001 session
641 * initialize frame).
642 */
643 cifs_set_port((struct sockaddr *)&server->dstaddr, CIFS_PORT);
644 cifs_reconnect(server);
645 break;
646 default:
647 cifs_server_dbg(VFS, "RFC 1002 unknown response type 0x%x\n", type);
648 cifs_reconnect(server);
649 }
650
651 return false;
652}
653
654void
655dequeue_mid(struct mid_q_entry *mid, bool malformed)
656{
657#ifdef CONFIG_CIFS_STATS2
658 mid->when_received = jiffies;
659#endif
660 spin_lock(&GlobalMid_Lock);
661 if (!malformed)
662 mid->mid_state = MID_RESPONSE_RECEIVED;
663 else
664 mid->mid_state = MID_RESPONSE_MALFORMED;
665 /*
666 * Trying to handle/dequeue a mid after the send_recv()
667 * function has finished processing it is a bug.
668 */
669 if (mid->mid_flags & MID_DELETED)
670 pr_warn_once("trying to dequeue a deleted mid\n");
671 else {
672 list_del_init(&mid->qhead);
673 mid->mid_flags |= MID_DELETED;
674 }
675 spin_unlock(&GlobalMid_Lock);
676}
677
678static unsigned int
679smb2_get_credits_from_hdr(char *buffer, struct TCP_Server_Info *server)
680{
681 struct smb2_sync_hdr *shdr = (struct smb2_sync_hdr *)buffer;
682
683 /*
684 * SMB1 does not use credits.
685 */
686 if (server->vals->header_preamble_size)
687 return 0;
688
689 return le16_to_cpu(shdr->CreditRequest);
690}
691
692static void
693handle_mid(struct mid_q_entry *mid, struct TCP_Server_Info *server,
694 char *buf, int malformed)
695{
696 if (server->ops->check_trans2 &&
697 server->ops->check_trans2(mid, server, buf, malformed))
698 return;
699 mid->credits_received = smb2_get_credits_from_hdr(buf, server);
700 mid->resp_buf = buf;
701 mid->large_buf = server->large_buf;
702 /* Was previous buf put in mpx struct for multi-rsp? */
703 if (!mid->multiRsp) {
704 /* smb buffer will be freed by user thread */
705 if (server->large_buf)
706 server->bigbuf = NULL;
707 else
708 server->smallbuf = NULL;
709 }
710 dequeue_mid(mid, malformed);
711}
712
713static void clean_demultiplex_info(struct TCP_Server_Info *server)
714{
715 int length;
716
717 /* take it off the list, if it's not already */
718 spin_lock(&cifs_tcp_ses_lock);
719 list_del_init(&server->tcp_ses_list);
720 spin_unlock(&cifs_tcp_ses_lock);
721
722 cancel_delayed_work_sync(&server->echo);
723 cancel_delayed_work_sync(&server->resolve);
724
725 spin_lock(&GlobalMid_Lock);
726 server->tcpStatus = CifsExiting;
727 spin_unlock(&GlobalMid_Lock);
728 wake_up_all(&server->response_q);
729
730 /* check if we have blocked requests that need to free */
731 spin_lock(&server->req_lock);
732 if (server->credits <= 0)
733 server->credits = 1;
734 spin_unlock(&server->req_lock);
735 /*
736 * Although there should not be any requests blocked on this queue it
737 * can not hurt to be paranoid and try to wake up requests that may
738 * haven been blocked when more than 50 at time were on the wire to the
739 * same server - they now will see the session is in exit state and get
740 * out of SendReceive.
741 */
742 wake_up_all(&server->request_q);
743 /* give those requests time to exit */
744 msleep(125);
745 if (cifs_rdma_enabled(server))
746 smbd_destroy(server);
747 if (server->ssocket) {
748 sock_release(server->ssocket);
749 server->ssocket = NULL;
750 }
751
752 if (!list_empty(&server->pending_mid_q)) {
753 struct list_head dispose_list;
754 struct mid_q_entry *mid_entry;
755 struct list_head *tmp, *tmp2;
756
757 INIT_LIST_HEAD(&dispose_list);
758 spin_lock(&GlobalMid_Lock);
759 list_for_each_safe(tmp, tmp2, &server->pending_mid_q) {
760 mid_entry = list_entry(tmp, struct mid_q_entry, qhead);
761 cifs_dbg(FYI, "Clearing mid %llu\n", mid_entry->mid);
762 kref_get(&mid_entry->refcount);
763 mid_entry->mid_state = MID_SHUTDOWN;
764 list_move(&mid_entry->qhead, &dispose_list);
765 mid_entry->mid_flags |= MID_DELETED;
766 }
767 spin_unlock(&GlobalMid_Lock);
768
769 /* now walk dispose list and issue callbacks */
770 list_for_each_safe(tmp, tmp2, &dispose_list) {
771 mid_entry = list_entry(tmp, struct mid_q_entry, qhead);
772 cifs_dbg(FYI, "Callback mid %llu\n", mid_entry->mid);
773 list_del_init(&mid_entry->qhead);
774 mid_entry->callback(mid_entry);
775 cifs_mid_q_entry_release(mid_entry);
776 }
777 /* 1/8th of sec is more than enough time for them to exit */
778 msleep(125);
779 }
780
781 if (!list_empty(&server->pending_mid_q)) {
782 /*
783 * mpx threads have not exited yet give them at least the smb
784 * send timeout time for long ops.
785 *
786 * Due to delays on oplock break requests, we need to wait at
787 * least 45 seconds before giving up on a request getting a
788 * response and going ahead and killing cifsd.
789 */
790 cifs_dbg(FYI, "Wait for exit from demultiplex thread\n");
791 msleep(46000);
792 /*
793 * If threads still have not exited they are probably never
794 * coming home not much else we can do but free the memory.
795 */
796 }
797
798 kfree(server->hostname);
799 kfree(server);
800
801 length = atomic_dec_return(&tcpSesAllocCount);
802 if (length > 0)
803 mempool_resize(cifs_req_poolp, length + cifs_min_rcv);
804}
805
806static int
807standard_receive3(struct TCP_Server_Info *server, struct mid_q_entry *mid)
808{
809 int length;
810 char *buf = server->smallbuf;
811 unsigned int pdu_length = server->pdu_size;
812
813 /* make sure this will fit in a large buffer */
814 if (pdu_length > CIFSMaxBufSize + MAX_HEADER_SIZE(server) -
815 server->vals->header_preamble_size) {
816 cifs_server_dbg(VFS, "SMB response too long (%u bytes)\n", pdu_length);
817 cifs_reconnect(server);
818 return -ECONNABORTED;
819 }
820
821 /* switch to large buffer if too big for a small one */
822 if (pdu_length > MAX_CIFS_SMALL_BUFFER_SIZE - 4) {
823 server->large_buf = true;
824 memcpy(server->bigbuf, buf, server->total_read);
825 buf = server->bigbuf;
826 }
827
828 /* now read the rest */
829 length = cifs_read_from_socket(server, buf + HEADER_SIZE(server) - 1,
830 pdu_length - HEADER_SIZE(server) + 1
831 + server->vals->header_preamble_size);
832
833 if (length < 0)
834 return length;
835 server->total_read += length;
836
837 dump_smb(buf, server->total_read);
838
839 return cifs_handle_standard(server, mid);
840}
841
842int
843cifs_handle_standard(struct TCP_Server_Info *server, struct mid_q_entry *mid)
844{
845 char *buf = server->large_buf ? server->bigbuf : server->smallbuf;
846 int length;
847
848 /*
849 * We know that we received enough to get to the MID as we
850 * checked the pdu_length earlier. Now check to see
851 * if the rest of the header is OK. We borrow the length
852 * var for the rest of the loop to avoid a new stack var.
853 *
854 * 48 bytes is enough to display the header and a little bit
855 * into the payload for debugging purposes.
856 */
857 length = server->ops->check_message(buf, server->total_read, server);
858 if (length != 0)
859 cifs_dump_mem("Bad SMB: ", buf,
860 min_t(unsigned int, server->total_read, 48));
861
862 if (server->ops->is_session_expired &&
863 server->ops->is_session_expired(buf)) {
864 cifs_reconnect(server);
865 return -1;
866 }
867
868 if (server->ops->is_status_pending &&
869 server->ops->is_status_pending(buf, server))
870 return -1;
871
872 if (!mid)
873 return length;
874
875 handle_mid(mid, server, buf, length);
876 return 0;
877}
878
879static void
880smb2_add_credits_from_hdr(char *buffer, struct TCP_Server_Info *server)
881{
882 struct smb2_sync_hdr *shdr = (struct smb2_sync_hdr *)buffer;
883 int scredits, in_flight;
884
885 /*
886 * SMB1 does not use credits.
887 */
888 if (server->vals->header_preamble_size)
889 return;
890
891 if (shdr->CreditRequest) {
892 spin_lock(&server->req_lock);
893 server->credits += le16_to_cpu(shdr->CreditRequest);
894 scredits = server->credits;
895 in_flight = server->in_flight;
896 spin_unlock(&server->req_lock);
897 wake_up(&server->request_q);
898
899 trace_smb3_add_credits(server->CurrentMid,
900 server->conn_id, server->hostname, scredits,
901 le16_to_cpu(shdr->CreditRequest), in_flight);
902 cifs_server_dbg(FYI, "%s: added %u credits total=%d\n",
903 __func__, le16_to_cpu(shdr->CreditRequest),
904 scredits);
905 }
906}
907
908
909static int
910cifs_demultiplex_thread(void *p)
911{
912 int i, num_mids, length;
913 struct TCP_Server_Info *server = p;
914 unsigned int pdu_length;
915 unsigned int next_offset;
916 char *buf = NULL;
917 struct task_struct *task_to_wake = NULL;
918 struct mid_q_entry *mids[MAX_COMPOUND];
919 char *bufs[MAX_COMPOUND];
920 unsigned int noreclaim_flag, num_io_timeout = 0;
921
922 noreclaim_flag = memalloc_noreclaim_save();
923 cifs_dbg(FYI, "Demultiplex PID: %d\n", task_pid_nr(current));
924
925 length = atomic_inc_return(&tcpSesAllocCount);
926 if (length > 1)
927 mempool_resize(cifs_req_poolp, length + cifs_min_rcv);
928
929 set_freezable();
930 allow_kernel_signal(SIGKILL);
931 while (server->tcpStatus != CifsExiting) {
932 if (try_to_freeze())
933 continue;
934
935 if (!allocate_buffers(server))
936 continue;
937
938 server->large_buf = false;
939 buf = server->smallbuf;
940 pdu_length = 4; /* enough to get RFC1001 header */
941
942 length = cifs_read_from_socket(server, buf, pdu_length);
943 if (length < 0)
944 continue;
945
946 if (server->vals->header_preamble_size == 0)
947 server->total_read = 0;
948 else
949 server->total_read = length;
950
951 /*
952 * The right amount was read from socket - 4 bytes,
953 * so we can now interpret the length field.
954 */
955 pdu_length = get_rfc1002_length(buf);
956
957 cifs_dbg(FYI, "RFC1002 header 0x%x\n", pdu_length);
958 if (!is_smb_response(server, buf[0]))
959 continue;
960next_pdu:
961 server->pdu_size = pdu_length;
962
963 /* make sure we have enough to get to the MID */
964 if (server->pdu_size < HEADER_SIZE(server) - 1 -
965 server->vals->header_preamble_size) {
966 cifs_server_dbg(VFS, "SMB response too short (%u bytes)\n",
967 server->pdu_size);
968 cifs_reconnect(server);
969 continue;
970 }
971
972 /* read down to the MID */
973 length = cifs_read_from_socket(server,
974 buf + server->vals->header_preamble_size,
975 HEADER_SIZE(server) - 1
976 - server->vals->header_preamble_size);
977 if (length < 0)
978 continue;
979 server->total_read += length;
980
981 if (server->ops->next_header) {
982 next_offset = server->ops->next_header(buf);
983 if (next_offset)
984 server->pdu_size = next_offset;
985 }
986
987 memset(mids, 0, sizeof(mids));
988 memset(bufs, 0, sizeof(bufs));
989 num_mids = 0;
990
991 if (server->ops->is_transform_hdr &&
992 server->ops->receive_transform &&
993 server->ops->is_transform_hdr(buf)) {
994 length = server->ops->receive_transform(server,
995 mids,
996 bufs,
997 &num_mids);
998 } else {
999 mids[0] = server->ops->find_mid(server, buf);
1000 bufs[0] = buf;
1001 num_mids = 1;
1002
1003 if (!mids[0] || !mids[0]->receive)
1004 length = standard_receive3(server, mids[0]);
1005 else
1006 length = mids[0]->receive(server, mids[0]);
1007 }
1008
1009 if (length < 0) {
1010 for (i = 0; i < num_mids; i++)
1011 if (mids[i])
1012 cifs_mid_q_entry_release(mids[i]);
1013 continue;
1014 }
1015
1016 if (server->ops->is_status_io_timeout &&
1017 server->ops->is_status_io_timeout(buf)) {
1018 num_io_timeout++;
1019 if (num_io_timeout > NUM_STATUS_IO_TIMEOUT) {
1020 cifs_reconnect(server);
1021 num_io_timeout = 0;
1022 continue;
1023 }
1024 }
1025
1026 server->lstrp = jiffies;
1027
1028 for (i = 0; i < num_mids; i++) {
1029 if (mids[i] != NULL) {
1030 mids[i]->resp_buf_size = server->pdu_size;
1031
1032 if (bufs[i] && server->ops->is_network_name_deleted)
1033 server->ops->is_network_name_deleted(bufs[i],
1034 server);
1035
1036 if (!mids[i]->multiRsp || mids[i]->multiEnd)
1037 mids[i]->callback(mids[i]);
1038
1039 cifs_mid_q_entry_release(mids[i]);
1040 } else if (server->ops->is_oplock_break &&
1041 server->ops->is_oplock_break(bufs[i],
1042 server)) {
1043 smb2_add_credits_from_hdr(bufs[i], server);
1044 cifs_dbg(FYI, "Received oplock break\n");
1045 } else {
1046 cifs_server_dbg(VFS, "No task to wake, unknown frame received! NumMids %d\n",
1047 atomic_read(&midCount));
1048 cifs_dump_mem("Received Data is: ", bufs[i],
1049 HEADER_SIZE(server));
1050 smb2_add_credits_from_hdr(bufs[i], server);
1051#ifdef CONFIG_CIFS_DEBUG2
1052 if (server->ops->dump_detail)
1053 server->ops->dump_detail(bufs[i],
1054 server);
1055 cifs_dump_mids(server);
1056#endif /* CIFS_DEBUG2 */
1057 }
1058 }
1059
1060 if (pdu_length > server->pdu_size) {
1061 if (!allocate_buffers(server))
1062 continue;
1063 pdu_length -= server->pdu_size;
1064 server->total_read = 0;
1065 server->large_buf = false;
1066 buf = server->smallbuf;
1067 goto next_pdu;
1068 }
1069 } /* end while !EXITING */
1070
1071 /* buffer usually freed in free_mid - need to free it here on exit */
1072 cifs_buf_release(server->bigbuf);
1073 if (server->smallbuf) /* no sense logging a debug message if NULL */
1074 cifs_small_buf_release(server->smallbuf);
1075
1076 task_to_wake = xchg(&server->tsk, NULL);
1077 clean_demultiplex_info(server);
1078
1079 /* if server->tsk was NULL then wait for a signal before exiting */
1080 if (!task_to_wake) {
1081 set_current_state(TASK_INTERRUPTIBLE);
1082 while (!signal_pending(current)) {
1083 schedule();
1084 set_current_state(TASK_INTERRUPTIBLE);
1085 }
1086 set_current_state(TASK_RUNNING);
1087 }
1088
1089 memalloc_noreclaim_restore(noreclaim_flag);
1090 module_put_and_exit(0);
1091}
1092
1093/**
1094 * Returns true if srcaddr isn't specified and rhs isn't specified, or
1095 * if srcaddr is specified and matches the IP address of the rhs argument
1096 */
1097bool
1098cifs_match_ipaddr(struct sockaddr *srcaddr, struct sockaddr *rhs)
1099{
1100 switch (srcaddr->sa_family) {
1101 case AF_UNSPEC:
1102 return (rhs->sa_family == AF_UNSPEC);
1103 case AF_INET: {
1104 struct sockaddr_in *saddr4 = (struct sockaddr_in *)srcaddr;
1105 struct sockaddr_in *vaddr4 = (struct sockaddr_in *)rhs;
1106 return (saddr4->sin_addr.s_addr == vaddr4->sin_addr.s_addr);
1107 }
1108 case AF_INET6: {
1109 struct sockaddr_in6 *saddr6 = (struct sockaddr_in6 *)srcaddr;
1110 struct sockaddr_in6 *vaddr6 = (struct sockaddr_in6 *)rhs;
1111 return ipv6_addr_equal(&saddr6->sin6_addr, &vaddr6->sin6_addr);
1112 }
1113 default:
1114 WARN_ON(1);
1115 return false; /* don't expect to be here */
1116 }
1117}
1118
1119/*
1120 * If no port is specified in addr structure, we try to match with 445 port
1121 * and if it fails - with 139 ports. It should be called only if address
1122 * families of server and addr are equal.
1123 */
1124static bool
1125match_port(struct TCP_Server_Info *server, struct sockaddr *addr)
1126{
1127 __be16 port, *sport;
1128
1129 /* SMBDirect manages its own ports, don't match it here */
1130 if (server->rdma)
1131 return true;
1132
1133 switch (addr->sa_family) {
1134 case AF_INET:
1135 sport = &((struct sockaddr_in *) &server->dstaddr)->sin_port;
1136 port = ((struct sockaddr_in *) addr)->sin_port;
1137 break;
1138 case AF_INET6:
1139 sport = &((struct sockaddr_in6 *) &server->dstaddr)->sin6_port;
1140 port = ((struct sockaddr_in6 *) addr)->sin6_port;
1141 break;
1142 default:
1143 WARN_ON(1);
1144 return false;
1145 }
1146
1147 if (!port) {
1148 port = htons(CIFS_PORT);
1149 if (port == *sport)
1150 return true;
1151
1152 port = htons(RFC1001_PORT);
1153 }
1154
1155 return port == *sport;
1156}
1157
1158static bool
1159match_address(struct TCP_Server_Info *server, struct sockaddr *addr,
1160 struct sockaddr *srcaddr)
1161{
1162 switch (addr->sa_family) {
1163 case AF_INET: {
1164 struct sockaddr_in *addr4 = (struct sockaddr_in *)addr;
1165 struct sockaddr_in *srv_addr4 =
1166 (struct sockaddr_in *)&server->dstaddr;
1167
1168 if (addr4->sin_addr.s_addr != srv_addr4->sin_addr.s_addr)
1169 return false;
1170 break;
1171 }
1172 case AF_INET6: {
1173 struct sockaddr_in6 *addr6 = (struct sockaddr_in6 *)addr;
1174 struct sockaddr_in6 *srv_addr6 =
1175 (struct sockaddr_in6 *)&server->dstaddr;
1176
1177 if (!ipv6_addr_equal(&addr6->sin6_addr,
1178 &srv_addr6->sin6_addr))
1179 return false;
1180 if (addr6->sin6_scope_id != srv_addr6->sin6_scope_id)
1181 return false;
1182 break;
1183 }
1184 default:
1185 WARN_ON(1);
1186 return false; /* don't expect to be here */
1187 }
1188
1189 if (!cifs_match_ipaddr(srcaddr, (struct sockaddr *)&server->srcaddr))
1190 return false;
1191
1192 return true;
1193}
1194
1195static bool
1196match_security(struct TCP_Server_Info *server, struct smb3_fs_context *ctx)
1197{
1198 /*
1199 * The select_sectype function should either return the ctx->sectype
1200 * that was specified, or "Unspecified" if that sectype was not
1201 * compatible with the given NEGOTIATE request.
1202 */
1203 if (server->ops->select_sectype(server, ctx->sectype)
1204 == Unspecified)
1205 return false;
1206
1207 /*
1208 * Now check if signing mode is acceptable. No need to check
1209 * global_secflags at this point since if MUST_SIGN is set then
1210 * the server->sign had better be too.
1211 */
1212 if (ctx->sign && !server->sign)
1213 return false;
1214
1215 return true;
1216}
1217
1218static int match_server(struct TCP_Server_Info *server, struct smb3_fs_context *ctx)
1219{
1220 struct sockaddr *addr = (struct sockaddr *)&ctx->dstaddr;
1221
1222 if (ctx->nosharesock)
1223 return 0;
1224
1225 /* If multidialect negotiation see if existing sessions match one */
1226 if (strcmp(ctx->vals->version_string, SMB3ANY_VERSION_STRING) == 0) {
1227 if (server->vals->protocol_id < SMB30_PROT_ID)
1228 return 0;
1229 } else if (strcmp(ctx->vals->version_string,
1230 SMBDEFAULT_VERSION_STRING) == 0) {
1231 if (server->vals->protocol_id < SMB21_PROT_ID)
1232 return 0;
1233 } else if ((server->vals != ctx->vals) || (server->ops != ctx->ops))
1234 return 0;
1235
1236 if (!net_eq(cifs_net_ns(server), current->nsproxy->net_ns))
1237 return 0;
1238
1239 if (!match_address(server, addr,
1240 (struct sockaddr *)&ctx->srcaddr))
1241 return 0;
1242
1243 if (!match_port(server, addr))
1244 return 0;
1245
1246 if (!match_security(server, ctx))
1247 return 0;
1248
1249 if (server->echo_interval != ctx->echo_interval * HZ)
1250 return 0;
1251
1252 if (server->rdma != ctx->rdma)
1253 return 0;
1254
1255 if (server->ignore_signature != ctx->ignore_signature)
1256 return 0;
1257
1258 if (server->min_offload != ctx->min_offload)
1259 return 0;
1260
1261 return 1;
1262}
1263
1264struct TCP_Server_Info *
1265cifs_find_tcp_session(struct smb3_fs_context *ctx)
1266{
1267 struct TCP_Server_Info *server;
1268
1269 spin_lock(&cifs_tcp_ses_lock);
1270 list_for_each_entry(server, &cifs_tcp_ses_list, tcp_ses_list) {
1271#ifdef CONFIG_CIFS_DFS_UPCALL
1272 /*
1273 * DFS failover implementation in cifs_reconnect() requires unique tcp sessions for
1274 * DFS connections to do failover properly, so avoid sharing them with regular
1275 * shares or even links that may connect to same server but having completely
1276 * different failover targets.
1277 */
1278 if (server->is_dfs_conn)
1279 continue;
1280#endif
1281 /*
1282 * Skip ses channels since they're only handled in lower layers
1283 * (e.g. cifs_send_recv).
1284 */
1285 if (server->is_channel || !match_server(server, ctx))
1286 continue;
1287
1288 ++server->srv_count;
1289 spin_unlock(&cifs_tcp_ses_lock);
1290 cifs_dbg(FYI, "Existing tcp session with server found\n");
1291 return server;
1292 }
1293 spin_unlock(&cifs_tcp_ses_lock);
1294 return NULL;
1295}
1296
1297void
1298cifs_put_tcp_session(struct TCP_Server_Info *server, int from_reconnect)
1299{
1300 struct task_struct *task;
1301
1302 spin_lock(&cifs_tcp_ses_lock);
1303 if (--server->srv_count > 0) {
1304 spin_unlock(&cifs_tcp_ses_lock);
1305 return;
1306 }
1307
1308 /* srv_count can never go negative */
1309 WARN_ON(server->srv_count < 0);
1310
1311 put_net(cifs_net_ns(server));
1312
1313 list_del_init(&server->tcp_ses_list);
1314 spin_unlock(&cifs_tcp_ses_lock);
1315
1316 cancel_delayed_work_sync(&server->echo);
1317 cancel_delayed_work_sync(&server->resolve);
1318
1319 if (from_reconnect)
1320 /*
1321 * Avoid deadlock here: reconnect work calls
1322 * cifs_put_tcp_session() at its end. Need to be sure
1323 * that reconnect work does nothing with server pointer after
1324 * that step.
1325 */
1326 cancel_delayed_work(&server->reconnect);
1327 else
1328 cancel_delayed_work_sync(&server->reconnect);
1329
1330 spin_lock(&GlobalMid_Lock);
1331 server->tcpStatus = CifsExiting;
1332 spin_unlock(&GlobalMid_Lock);
1333
1334 cifs_crypto_secmech_release(server);
1335 cifs_fscache_release_client_cookie(server);
1336
1337 kfree(server->session_key.response);
1338 server->session_key.response = NULL;
1339 server->session_key.len = 0;
1340
1341 task = xchg(&server->tsk, NULL);
1342 if (task)
1343 send_sig(SIGKILL, task, 1);
1344}
1345
1346struct TCP_Server_Info *
1347cifs_get_tcp_session(struct smb3_fs_context *ctx)
1348{
1349 struct TCP_Server_Info *tcp_ses = NULL;
1350 int rc;
1351
1352 cifs_dbg(FYI, "UNC: %s\n", ctx->UNC);
1353
1354 /* see if we already have a matching tcp_ses */
1355 tcp_ses = cifs_find_tcp_session(ctx);
1356 if (tcp_ses)
1357 return tcp_ses;
1358
1359 tcp_ses = kzalloc(sizeof(struct TCP_Server_Info), GFP_KERNEL);
1360 if (!tcp_ses) {
1361 rc = -ENOMEM;
1362 goto out_err;
1363 }
1364
1365 tcp_ses->ops = ctx->ops;
1366 tcp_ses->vals = ctx->vals;
1367 cifs_set_net_ns(tcp_ses, get_net(current->nsproxy->net_ns));
1368 tcp_ses->hostname = extract_hostname(ctx->UNC);
1369 if (IS_ERR(tcp_ses->hostname)) {
1370 rc = PTR_ERR(tcp_ses->hostname);
1371 goto out_err_crypto_release;
1372 }
1373
1374 tcp_ses->conn_id = atomic_inc_return(&tcpSesNextId);
1375 tcp_ses->noblockcnt = ctx->rootfs;
1376 tcp_ses->noblocksnd = ctx->noblocksnd || ctx->rootfs;
1377 tcp_ses->noautotune = ctx->noautotune;
1378 tcp_ses->tcp_nodelay = ctx->sockopt_tcp_nodelay;
1379 tcp_ses->rdma = ctx->rdma;
1380 tcp_ses->in_flight = 0;
1381 tcp_ses->max_in_flight = 0;
1382 tcp_ses->credits = 1;
1383 init_waitqueue_head(&tcp_ses->response_q);
1384 init_waitqueue_head(&tcp_ses->request_q);
1385 INIT_LIST_HEAD(&tcp_ses->pending_mid_q);
1386 mutex_init(&tcp_ses->srv_mutex);
1387 memcpy(tcp_ses->workstation_RFC1001_name,
1388 ctx->source_rfc1001_name, RFC1001_NAME_LEN_WITH_NULL);
1389 memcpy(tcp_ses->server_RFC1001_name,
1390 ctx->target_rfc1001_name, RFC1001_NAME_LEN_WITH_NULL);
1391 tcp_ses->session_estab = false;
1392 tcp_ses->sequence_number = 0;
1393 tcp_ses->reconnect_instance = 1;
1394 tcp_ses->lstrp = jiffies;
1395 tcp_ses->compress_algorithm = cpu_to_le16(ctx->compression);
1396 spin_lock_init(&tcp_ses->req_lock);
1397 INIT_LIST_HEAD(&tcp_ses->tcp_ses_list);
1398 INIT_LIST_HEAD(&tcp_ses->smb_ses_list);
1399 INIT_DELAYED_WORK(&tcp_ses->echo, cifs_echo_request);
1400 INIT_DELAYED_WORK(&tcp_ses->resolve, cifs_resolve_server);
1401 INIT_DELAYED_WORK(&tcp_ses->reconnect, smb2_reconnect_server);
1402 mutex_init(&tcp_ses->reconnect_mutex);
1403 memcpy(&tcp_ses->srcaddr, &ctx->srcaddr,
1404 sizeof(tcp_ses->srcaddr));
1405 memcpy(&tcp_ses->dstaddr, &ctx->dstaddr,
1406 sizeof(tcp_ses->dstaddr));
1407 if (ctx->use_client_guid)
1408 memcpy(tcp_ses->client_guid, ctx->client_guid,
1409 SMB2_CLIENT_GUID_SIZE);
1410 else
1411 generate_random_uuid(tcp_ses->client_guid);
1412 /*
1413 * at this point we are the only ones with the pointer
1414 * to the struct since the kernel thread not created yet
1415 * no need to spinlock this init of tcpStatus or srv_count
1416 */
1417 tcp_ses->tcpStatus = CifsNew;
1418 ++tcp_ses->srv_count;
1419
1420 if (ctx->echo_interval >= SMB_ECHO_INTERVAL_MIN &&
1421 ctx->echo_interval <= SMB_ECHO_INTERVAL_MAX)
1422 tcp_ses->echo_interval = ctx->echo_interval * HZ;
1423 else
1424 tcp_ses->echo_interval = SMB_ECHO_INTERVAL_DEFAULT * HZ;
1425 if (tcp_ses->rdma) {
1426#ifndef CONFIG_CIFS_SMB_DIRECT
1427 cifs_dbg(VFS, "CONFIG_CIFS_SMB_DIRECT is not enabled\n");
1428 rc = -ENOENT;
1429 goto out_err_crypto_release;
1430#endif
1431 tcp_ses->smbd_conn = smbd_get_connection(
1432 tcp_ses, (struct sockaddr *)&ctx->dstaddr);
1433 if (tcp_ses->smbd_conn) {
1434 cifs_dbg(VFS, "RDMA transport established\n");
1435 rc = 0;
1436 goto smbd_connected;
1437 } else {
1438 rc = -ENOENT;
1439 goto out_err_crypto_release;
1440 }
1441 }
1442 rc = ip_connect(tcp_ses);
1443 if (rc < 0) {
1444 cifs_dbg(VFS, "Error connecting to socket. Aborting operation.\n");
1445 goto out_err_crypto_release;
1446 }
1447smbd_connected:
1448 /*
1449 * since we're in a cifs function already, we know that
1450 * this will succeed. No need for try_module_get().
1451 */
1452 __module_get(THIS_MODULE);
1453 tcp_ses->tsk = kthread_run(cifs_demultiplex_thread,
1454 tcp_ses, "cifsd");
1455 if (IS_ERR(tcp_ses->tsk)) {
1456 rc = PTR_ERR(tcp_ses->tsk);
1457 cifs_dbg(VFS, "error %d create cifsd thread\n", rc);
1458 module_put(THIS_MODULE);
1459 goto out_err_crypto_release;
1460 }
1461 tcp_ses->min_offload = ctx->min_offload;
1462 /*
1463 * at this point we are the only ones with the pointer
1464 * to the struct since the kernel thread not created yet
1465 * no need to spinlock this update of tcpStatus
1466 */
1467 tcp_ses->tcpStatus = CifsNeedNegotiate;
1468
1469 if ((ctx->max_credits < 20) || (ctx->max_credits > 60000))
1470 tcp_ses->max_credits = SMB2_MAX_CREDITS_AVAILABLE;
1471 else
1472 tcp_ses->max_credits = ctx->max_credits;
1473
1474 tcp_ses->nr_targets = 1;
1475 tcp_ses->ignore_signature = ctx->ignore_signature;
1476 /* thread spawned, put it on the list */
1477 spin_lock(&cifs_tcp_ses_lock);
1478 list_add(&tcp_ses->tcp_ses_list, &cifs_tcp_ses_list);
1479 spin_unlock(&cifs_tcp_ses_lock);
1480
1481 cifs_fscache_get_client_cookie(tcp_ses);
1482
1483 /* queue echo request delayed work */
1484 queue_delayed_work(cifsiod_wq, &tcp_ses->echo, tcp_ses->echo_interval);
1485
1486 /* queue dns resolution delayed work */
1487 cifs_dbg(FYI, "%s: next dns resolution scheduled for %d seconds in the future\n",
1488 __func__, SMB_DNS_RESOLVE_INTERVAL_DEFAULT);
1489
1490 queue_delayed_work(cifsiod_wq, &tcp_ses->resolve, (SMB_DNS_RESOLVE_INTERVAL_DEFAULT * HZ));
1491
1492 return tcp_ses;
1493
1494out_err_crypto_release:
1495 cifs_crypto_secmech_release(tcp_ses);
1496
1497 put_net(cifs_net_ns(tcp_ses));
1498
1499out_err:
1500 if (tcp_ses) {
1501 if (!IS_ERR(tcp_ses->hostname))
1502 kfree(tcp_ses->hostname);
1503 if (tcp_ses->ssocket)
1504 sock_release(tcp_ses->ssocket);
1505 kfree(tcp_ses);
1506 }
1507 return ERR_PTR(rc);
1508}
1509
1510static int match_session(struct cifs_ses *ses, struct smb3_fs_context *ctx)
1511{
1512 if (ctx->sectype != Unspecified &&
1513 ctx->sectype != ses->sectype)
1514 return 0;
1515
1516 /*
1517 * If an existing session is limited to less channels than
1518 * requested, it should not be reused
1519 */
1520 if (ses->chan_max < ctx->max_channels)
1521 return 0;
1522
1523 switch (ses->sectype) {
1524 case Kerberos:
1525 if (!uid_eq(ctx->cred_uid, ses->cred_uid))
1526 return 0;
1527 break;
1528 default:
1529 /* NULL username means anonymous session */
1530 if (ses->user_name == NULL) {
1531 if (!ctx->nullauth)
1532 return 0;
1533 break;
1534 }
1535
1536 /* anything else takes username/password */
1537 if (strncmp(ses->user_name,
1538 ctx->username ? ctx->username : "",
1539 CIFS_MAX_USERNAME_LEN))
1540 return 0;
1541 if ((ctx->username && strlen(ctx->username) != 0) &&
1542 ses->password != NULL &&
1543 strncmp(ses->password,
1544 ctx->password ? ctx->password : "",
1545 CIFS_MAX_PASSWORD_LEN))
1546 return 0;
1547 }
1548 return 1;
1549}
1550
1551/**
1552 * cifs_setup_ipc - helper to setup the IPC tcon for the session
1553 *
1554 * A new IPC connection is made and stored in the session
1555 * tcon_ipc. The IPC tcon has the same lifetime as the session.
1556 */
1557static int
1558cifs_setup_ipc(struct cifs_ses *ses, struct smb3_fs_context *ctx)
1559{
1560 int rc = 0, xid;
1561 struct cifs_tcon *tcon;
1562 char unc[SERVER_NAME_LENGTH + sizeof("//x/IPC$")] = {0};
1563 bool seal = false;
1564 struct TCP_Server_Info *server = ses->server;
1565
1566 /*
1567 * If the mount request that resulted in the creation of the
1568 * session requires encryption, force IPC to be encrypted too.
1569 */
1570 if (ctx->seal) {
1571 if (server->capabilities & SMB2_GLOBAL_CAP_ENCRYPTION)
1572 seal = true;
1573 else {
1574 cifs_server_dbg(VFS,
1575 "IPC: server doesn't support encryption\n");
1576 return -EOPNOTSUPP;
1577 }
1578 }
1579
1580 tcon = tconInfoAlloc();
1581 if (tcon == NULL)
1582 return -ENOMEM;
1583
1584 scnprintf(unc, sizeof(unc), "\\\\%s\\IPC$", server->hostname);
1585
1586 xid = get_xid();
1587 tcon->ses = ses;
1588 tcon->ipc = true;
1589 tcon->seal = seal;
1590 rc = server->ops->tree_connect(xid, ses, unc, tcon, ctx->local_nls);
1591 free_xid(xid);
1592
1593 if (rc) {
1594 cifs_server_dbg(VFS, "failed to connect to IPC (rc=%d)\n", rc);
1595 tconInfoFree(tcon);
1596 goto out;
1597 }
1598
1599 cifs_dbg(FYI, "IPC tcon rc = %d ipc tid = %d\n", rc, tcon->tid);
1600
1601 ses->tcon_ipc = tcon;
1602out:
1603 return rc;
1604}
1605
1606/**
1607 * cifs_free_ipc - helper to release the session IPC tcon
1608 *
1609 * Needs to be called everytime a session is destroyed.
1610 *
1611 * On session close, the IPC is closed and the server must release all tcons of the session.
1612 * No need to send a tree disconnect here.
1613 *
1614 * Besides, it will make the server to not close durable and resilient files on session close, as
1615 * specified in MS-SMB2 3.3.5.6 Receiving an SMB2 LOGOFF Request.
1616 */
1617static int
1618cifs_free_ipc(struct cifs_ses *ses)
1619{
1620 struct cifs_tcon *tcon = ses->tcon_ipc;
1621
1622 if (tcon == NULL)
1623 return 0;
1624
1625 tconInfoFree(tcon);
1626 ses->tcon_ipc = NULL;
1627 return 0;
1628}
1629
1630static struct cifs_ses *
1631cifs_find_smb_ses(struct TCP_Server_Info *server, struct smb3_fs_context *ctx)
1632{
1633 struct cifs_ses *ses;
1634
1635 spin_lock(&cifs_tcp_ses_lock);
1636 list_for_each_entry(ses, &server->smb_ses_list, smb_ses_list) {
1637 if (ses->status == CifsExiting)
1638 continue;
1639 if (!match_session(ses, ctx))
1640 continue;
1641 ++ses->ses_count;
1642 spin_unlock(&cifs_tcp_ses_lock);
1643 return ses;
1644 }
1645 spin_unlock(&cifs_tcp_ses_lock);
1646 return NULL;
1647}
1648
1649void cifs_put_smb_ses(struct cifs_ses *ses)
1650{
1651 unsigned int rc, xid;
1652 struct TCP_Server_Info *server = ses->server;
1653 cifs_dbg(FYI, "%s: ses_count=%d\n", __func__, ses->ses_count);
1654
1655 spin_lock(&cifs_tcp_ses_lock);
1656 if (ses->status == CifsExiting) {
1657 spin_unlock(&cifs_tcp_ses_lock);
1658 return;
1659 }
1660
1661 cifs_dbg(FYI, "%s: ses_count=%d\n", __func__, ses->ses_count);
1662 cifs_dbg(FYI, "%s: ses ipc: %s\n", __func__, ses->tcon_ipc ? ses->tcon_ipc->treeName : "NONE");
1663
1664 if (--ses->ses_count > 0) {
1665 spin_unlock(&cifs_tcp_ses_lock);
1666 return;
1667 }
1668 spin_unlock(&cifs_tcp_ses_lock);
1669
1670 /* ses_count can never go negative */
1671 WARN_ON(ses->ses_count < 0);
1672
1673 spin_lock(&GlobalMid_Lock);
1674 if (ses->status == CifsGood)
1675 ses->status = CifsExiting;
1676 spin_unlock(&GlobalMid_Lock);
1677
1678 cifs_free_ipc(ses);
1679
1680 if (ses->status == CifsExiting && server->ops->logoff) {
1681 xid = get_xid();
1682 rc = server->ops->logoff(xid, ses);
1683 if (rc)
1684 cifs_server_dbg(VFS, "%s: Session Logoff failure rc=%d\n",
1685 __func__, rc);
1686 _free_xid(xid);
1687 }
1688
1689 spin_lock(&cifs_tcp_ses_lock);
1690 list_del_init(&ses->smb_ses_list);
1691 spin_unlock(&cifs_tcp_ses_lock);
1692
1693 /* close any extra channels */
1694 if (ses->chan_count > 1) {
1695 int i;
1696
1697 for (i = 1; i < ses->chan_count; i++)
1698 cifs_put_tcp_session(ses->chans[i].server, 0);
1699 }
1700
1701 sesInfoFree(ses);
1702 cifs_put_tcp_session(server, 0);
1703}
1704
1705#ifdef CONFIG_KEYS
1706
1707/* strlen("cifs:a:") + CIFS_MAX_DOMAINNAME_LEN + 1 */
1708#define CIFSCREDS_DESC_SIZE (7 + CIFS_MAX_DOMAINNAME_LEN + 1)
1709
1710/* Populate username and pw fields from keyring if possible */
1711static int
1712cifs_set_cifscreds(struct smb3_fs_context *ctx, struct cifs_ses *ses)
1713{
1714 int rc = 0;
1715 int is_domain = 0;
1716 const char *delim, *payload;
1717 char *desc;
1718 ssize_t len;
1719 struct key *key;
1720 struct TCP_Server_Info *server = ses->server;
1721 struct sockaddr_in *sa;
1722 struct sockaddr_in6 *sa6;
1723 const struct user_key_payload *upayload;
1724
1725 desc = kmalloc(CIFSCREDS_DESC_SIZE, GFP_KERNEL);
1726 if (!desc)
1727 return -ENOMEM;
1728
1729 /* try to find an address key first */
1730 switch (server->dstaddr.ss_family) {
1731 case AF_INET:
1732 sa = (struct sockaddr_in *)&server->dstaddr;
1733 sprintf(desc, "cifs:a:%pI4", &sa->sin_addr.s_addr);
1734 break;
1735 case AF_INET6:
1736 sa6 = (struct sockaddr_in6 *)&server->dstaddr;
1737 sprintf(desc, "cifs:a:%pI6c", &sa6->sin6_addr.s6_addr);
1738 break;
1739 default:
1740 cifs_dbg(FYI, "Bad ss_family (%hu)\n",
1741 server->dstaddr.ss_family);
1742 rc = -EINVAL;
1743 goto out_err;
1744 }
1745
1746 cifs_dbg(FYI, "%s: desc=%s\n", __func__, desc);
1747 key = request_key(&key_type_logon, desc, "");
1748 if (IS_ERR(key)) {
1749 if (!ses->domainName) {
1750 cifs_dbg(FYI, "domainName is NULL\n");
1751 rc = PTR_ERR(key);
1752 goto out_err;
1753 }
1754
1755 /* didn't work, try to find a domain key */
1756 sprintf(desc, "cifs:d:%s", ses->domainName);
1757 cifs_dbg(FYI, "%s: desc=%s\n", __func__, desc);
1758 key = request_key(&key_type_logon, desc, "");
1759 if (IS_ERR(key)) {
1760 rc = PTR_ERR(key);
1761 goto out_err;
1762 }
1763 is_domain = 1;
1764 }
1765
1766 down_read(&key->sem);
1767 upayload = user_key_payload_locked(key);
1768 if (IS_ERR_OR_NULL(upayload)) {
1769 rc = upayload ? PTR_ERR(upayload) : -EINVAL;
1770 goto out_key_put;
1771 }
1772
1773 /* find first : in payload */
1774 payload = upayload->data;
1775 delim = strnchr(payload, upayload->datalen, ':');
1776 cifs_dbg(FYI, "payload=%s\n", payload);
1777 if (!delim) {
1778 cifs_dbg(FYI, "Unable to find ':' in payload (datalen=%d)\n",
1779 upayload->datalen);
1780 rc = -EINVAL;
1781 goto out_key_put;
1782 }
1783
1784 len = delim - payload;
1785 if (len > CIFS_MAX_USERNAME_LEN || len <= 0) {
1786 cifs_dbg(FYI, "Bad value from username search (len=%zd)\n",
1787 len);
1788 rc = -EINVAL;
1789 goto out_key_put;
1790 }
1791
1792 ctx->username = kstrndup(payload, len, GFP_KERNEL);
1793 if (!ctx->username) {
1794 cifs_dbg(FYI, "Unable to allocate %zd bytes for username\n",
1795 len);
1796 rc = -ENOMEM;
1797 goto out_key_put;
1798 }
1799 cifs_dbg(FYI, "%s: username=%s\n", __func__, ctx->username);
1800
1801 len = key->datalen - (len + 1);
1802 if (len > CIFS_MAX_PASSWORD_LEN || len <= 0) {
1803 cifs_dbg(FYI, "Bad len for password search (len=%zd)\n", len);
1804 rc = -EINVAL;
1805 kfree(ctx->username);
1806 ctx->username = NULL;
1807 goto out_key_put;
1808 }
1809
1810 ++delim;
1811 ctx->password = kstrndup(delim, len, GFP_KERNEL);
1812 if (!ctx->password) {
1813 cifs_dbg(FYI, "Unable to allocate %zd bytes for password\n",
1814 len);
1815 rc = -ENOMEM;
1816 kfree(ctx->username);
1817 ctx->username = NULL;
1818 goto out_key_put;
1819 }
1820
1821 /*
1822 * If we have a domain key then we must set the domainName in the
1823 * for the request.
1824 */
1825 if (is_domain && ses->domainName) {
1826 ctx->domainname = kstrdup(ses->domainName, GFP_KERNEL);
1827 if (!ctx->domainname) {
1828 cifs_dbg(FYI, "Unable to allocate %zd bytes for domain\n",
1829 len);
1830 rc = -ENOMEM;
1831 kfree(ctx->username);
1832 ctx->username = NULL;
1833 kfree_sensitive(ctx->password);
1834 ctx->password = NULL;
1835 goto out_key_put;
1836 }
1837 }
1838
1839out_key_put:
1840 up_read(&key->sem);
1841 key_put(key);
1842out_err:
1843 kfree(desc);
1844 cifs_dbg(FYI, "%s: returning %d\n", __func__, rc);
1845 return rc;
1846}
1847#else /* ! CONFIG_KEYS */
1848static inline int
1849cifs_set_cifscreds(struct smb3_fs_context *ctx __attribute__((unused)),
1850 struct cifs_ses *ses __attribute__((unused)))
1851{
1852 return -ENOSYS;
1853}
1854#endif /* CONFIG_KEYS */
1855
1856/**
1857 * cifs_get_smb_ses - get a session matching @ctx data from @server
1858 *
1859 * This function assumes it is being called from cifs_mount() where we
1860 * already got a server reference (server refcount +1). See
1861 * cifs_get_tcon() for refcount explanations.
1862 */
1863struct cifs_ses *
1864cifs_get_smb_ses(struct TCP_Server_Info *server, struct smb3_fs_context *ctx)
1865{
1866 int rc = -ENOMEM;
1867 unsigned int xid;
1868 struct cifs_ses *ses;
1869 struct sockaddr_in *addr = (struct sockaddr_in *)&server->dstaddr;
1870 struct sockaddr_in6 *addr6 = (struct sockaddr_in6 *)&server->dstaddr;
1871
1872 xid = get_xid();
1873
1874 ses = cifs_find_smb_ses(server, ctx);
1875 if (ses) {
1876 cifs_dbg(FYI, "Existing smb sess found (status=%d)\n",
1877 ses->status);
1878
1879 mutex_lock(&ses->session_mutex);
1880 rc = cifs_negotiate_protocol(xid, ses);
1881 if (rc) {
1882 mutex_unlock(&ses->session_mutex);
1883 /* problem -- put our ses reference */
1884 cifs_put_smb_ses(ses);
1885 free_xid(xid);
1886 return ERR_PTR(rc);
1887 }
1888 if (ses->need_reconnect) {
1889 cifs_dbg(FYI, "Session needs reconnect\n");
1890 rc = cifs_setup_session(xid, ses,
1891 ctx->local_nls);
1892 if (rc) {
1893 mutex_unlock(&ses->session_mutex);
1894 /* problem -- put our reference */
1895 cifs_put_smb_ses(ses);
1896 free_xid(xid);
1897 return ERR_PTR(rc);
1898 }
1899 }
1900 mutex_unlock(&ses->session_mutex);
1901
1902 /* existing SMB ses has a server reference already */
1903 cifs_put_tcp_session(server, 0);
1904 free_xid(xid);
1905 return ses;
1906 }
1907
1908 cifs_dbg(FYI, "Existing smb sess not found\n");
1909 ses = sesInfoAlloc();
1910 if (ses == NULL)
1911 goto get_ses_fail;
1912
1913 /* new SMB session uses our server ref */
1914 ses->server = server;
1915 if (server->dstaddr.ss_family == AF_INET6)
1916 sprintf(ses->ip_addr, "%pI6", &addr6->sin6_addr);
1917 else
1918 sprintf(ses->ip_addr, "%pI4", &addr->sin_addr);
1919
1920 if (ctx->username) {
1921 ses->user_name = kstrdup(ctx->username, GFP_KERNEL);
1922 if (!ses->user_name)
1923 goto get_ses_fail;
1924 }
1925
1926 /* ctx->password freed at unmount */
1927 if (ctx->password) {
1928 ses->password = kstrdup(ctx->password, GFP_KERNEL);
1929 if (!ses->password)
1930 goto get_ses_fail;
1931 }
1932 if (ctx->domainname) {
1933 ses->domainName = kstrdup(ctx->domainname, GFP_KERNEL);
1934 if (!ses->domainName)
1935 goto get_ses_fail;
1936 }
1937 if (ctx->domainauto)
1938 ses->domainAuto = ctx->domainauto;
1939 ses->cred_uid = ctx->cred_uid;
1940 ses->linux_uid = ctx->linux_uid;
1941
1942 ses->sectype = ctx->sectype;
1943 ses->sign = ctx->sign;
1944 mutex_lock(&ses->session_mutex);
1945
1946 /* add server as first channel */
1947 ses->chans[0].server = server;
1948 ses->chan_count = 1;
1949 ses->chan_max = ctx->multichannel ? ctx->max_channels:1;
1950
1951 rc = cifs_negotiate_protocol(xid, ses);
1952 if (!rc)
1953 rc = cifs_setup_session(xid, ses, ctx->local_nls);
1954
1955 /* each channel uses a different signing key */
1956 memcpy(ses->chans[0].signkey, ses->smb3signingkey,
1957 sizeof(ses->smb3signingkey));
1958
1959 mutex_unlock(&ses->session_mutex);
1960 if (rc)
1961 goto get_ses_fail;
1962
1963 /* success, put it on the list and add it as first channel */
1964 spin_lock(&cifs_tcp_ses_lock);
1965 list_add(&ses->smb_ses_list, &server->smb_ses_list);
1966 spin_unlock(&cifs_tcp_ses_lock);
1967
1968 free_xid(xid);
1969
1970 cifs_setup_ipc(ses, ctx);
1971
1972 return ses;
1973
1974get_ses_fail:
1975 sesInfoFree(ses);
1976 free_xid(xid);
1977 return ERR_PTR(rc);
1978}
1979
1980static int match_tcon(struct cifs_tcon *tcon, struct smb3_fs_context *ctx)
1981{
1982 if (tcon->tidStatus == CifsExiting)
1983 return 0;
1984 if (strncmp(tcon->treeName, ctx->UNC, MAX_TREE_SIZE))
1985 return 0;
1986 if (tcon->seal != ctx->seal)
1987 return 0;
1988 if (tcon->snapshot_time != ctx->snapshot_time)
1989 return 0;
1990 if (tcon->handle_timeout != ctx->handle_timeout)
1991 return 0;
1992 if (tcon->no_lease != ctx->no_lease)
1993 return 0;
1994 if (tcon->nodelete != ctx->nodelete)
1995 return 0;
1996 return 1;
1997}
1998
1999static struct cifs_tcon *
2000cifs_find_tcon(struct cifs_ses *ses, struct smb3_fs_context *ctx)
2001{
2002 struct list_head *tmp;
2003 struct cifs_tcon *tcon;
2004
2005 spin_lock(&cifs_tcp_ses_lock);
2006 list_for_each(tmp, &ses->tcon_list) {
2007 tcon = list_entry(tmp, struct cifs_tcon, tcon_list);
2008
2009 if (!match_tcon(tcon, ctx))
2010 continue;
2011 ++tcon->tc_count;
2012 spin_unlock(&cifs_tcp_ses_lock);
2013 return tcon;
2014 }
2015 spin_unlock(&cifs_tcp_ses_lock);
2016 return NULL;
2017}
2018
2019void
2020cifs_put_tcon(struct cifs_tcon *tcon)
2021{
2022 unsigned int xid;
2023 struct cifs_ses *ses;
2024
2025 /*
2026 * IPC tcon share the lifetime of their session and are
2027 * destroyed in the session put function
2028 */
2029 if (tcon == NULL || tcon->ipc)
2030 return;
2031
2032 ses = tcon->ses;
2033 cifs_dbg(FYI, "%s: tc_count=%d\n", __func__, tcon->tc_count);
2034 spin_lock(&cifs_tcp_ses_lock);
2035 if (--tcon->tc_count > 0) {
2036 spin_unlock(&cifs_tcp_ses_lock);
2037 return;
2038 }
2039
2040 /* tc_count can never go negative */
2041 WARN_ON(tcon->tc_count < 0);
2042
2043 if (tcon->use_witness) {
2044 int rc;
2045
2046 rc = cifs_swn_unregister(tcon);
2047 if (rc < 0) {
2048 cifs_dbg(VFS, "%s: Failed to unregister for witness notifications: %d\n",
2049 __func__, rc);
2050 }
2051 }
2052
2053 list_del_init(&tcon->tcon_list);
2054 spin_unlock(&cifs_tcp_ses_lock);
2055
2056 xid = get_xid();
2057 if (ses->server->ops->tree_disconnect)
2058 ses->server->ops->tree_disconnect(xid, tcon);
2059 _free_xid(xid);
2060
2061 cifs_fscache_release_super_cookie(tcon);
2062 tconInfoFree(tcon);
2063 cifs_put_smb_ses(ses);
2064}
2065
2066/**
2067 * cifs_get_tcon - get a tcon matching @ctx data from @ses
2068 *
2069 * - tcon refcount is the number of mount points using the tcon.
2070 * - ses refcount is the number of tcon using the session.
2071 *
2072 * 1. This function assumes it is being called from cifs_mount() where
2073 * we already got a session reference (ses refcount +1).
2074 *
2075 * 2. Since we're in the context of adding a mount point, the end
2076 * result should be either:
2077 *
2078 * a) a new tcon already allocated with refcount=1 (1 mount point) and
2079 * its session refcount incremented (1 new tcon). This +1 was
2080 * already done in (1).
2081 *
2082 * b) an existing tcon with refcount+1 (add a mount point to it) and
2083 * identical ses refcount (no new tcon). Because of (1) we need to
2084 * decrement the ses refcount.
2085 */
2086static struct cifs_tcon *
2087cifs_get_tcon(struct cifs_ses *ses, struct smb3_fs_context *ctx)
2088{
2089 int rc, xid;
2090 struct cifs_tcon *tcon;
2091
2092 tcon = cifs_find_tcon(ses, ctx);
2093 if (tcon) {
2094 /*
2095 * tcon has refcount already incremented but we need to
2096 * decrement extra ses reference gotten by caller (case b)
2097 */
2098 cifs_dbg(FYI, "Found match on UNC path\n");
2099 cifs_put_smb_ses(ses);
2100 return tcon;
2101 }
2102
2103 if (!ses->server->ops->tree_connect) {
2104 rc = -ENOSYS;
2105 goto out_fail;
2106 }
2107
2108 tcon = tconInfoAlloc();
2109 if (tcon == NULL) {
2110 rc = -ENOMEM;
2111 goto out_fail;
2112 }
2113
2114 if (ctx->snapshot_time) {
2115 if (ses->server->vals->protocol_id == 0) {
2116 cifs_dbg(VFS,
2117 "Use SMB2 or later for snapshot mount option\n");
2118 rc = -EOPNOTSUPP;
2119 goto out_fail;
2120 } else
2121 tcon->snapshot_time = ctx->snapshot_time;
2122 }
2123
2124 if (ctx->handle_timeout) {
2125 if (ses->server->vals->protocol_id == 0) {
2126 cifs_dbg(VFS,
2127 "Use SMB2.1 or later for handle timeout option\n");
2128 rc = -EOPNOTSUPP;
2129 goto out_fail;
2130 } else
2131 tcon->handle_timeout = ctx->handle_timeout;
2132 }
2133
2134 tcon->ses = ses;
2135 if (ctx->password) {
2136 tcon->password = kstrdup(ctx->password, GFP_KERNEL);
2137 if (!tcon->password) {
2138 rc = -ENOMEM;
2139 goto out_fail;
2140 }
2141 }
2142
2143 if (ctx->seal) {
2144 if (ses->server->vals->protocol_id == 0) {
2145 cifs_dbg(VFS,
2146 "SMB3 or later required for encryption\n");
2147 rc = -EOPNOTSUPP;
2148 goto out_fail;
2149 } else if (tcon->ses->server->capabilities &
2150 SMB2_GLOBAL_CAP_ENCRYPTION)
2151 tcon->seal = true;
2152 else {
2153 cifs_dbg(VFS, "Encryption is not supported on share\n");
2154 rc = -EOPNOTSUPP;
2155 goto out_fail;
2156 }
2157 }
2158
2159 if (ctx->linux_ext) {
2160 if (ses->server->posix_ext_supported) {
2161 tcon->posix_extensions = true;
2162 pr_warn_once("SMB3.11 POSIX Extensions are experimental\n");
2163 } else {
2164 cifs_dbg(VFS, "Server does not support mounting with posix SMB3.11 extensions\n");
2165 rc = -EOPNOTSUPP;
2166 goto out_fail;
2167 }
2168 }
2169
2170 /*
2171 * BB Do we need to wrap session_mutex around this TCon call and Unix
2172 * SetFS as we do on SessSetup and reconnect?
2173 */
2174 xid = get_xid();
2175 rc = ses->server->ops->tree_connect(xid, ses, ctx->UNC, tcon,
2176 ctx->local_nls);
2177 free_xid(xid);
2178 cifs_dbg(FYI, "Tcon rc = %d\n", rc);
2179 if (rc)
2180 goto out_fail;
2181
2182 tcon->use_persistent = false;
2183 /* check if SMB2 or later, CIFS does not support persistent handles */
2184 if (ctx->persistent) {
2185 if (ses->server->vals->protocol_id == 0) {
2186 cifs_dbg(VFS,
2187 "SMB3 or later required for persistent handles\n");
2188 rc = -EOPNOTSUPP;
2189 goto out_fail;
2190 } else if (ses->server->capabilities &
2191 SMB2_GLOBAL_CAP_PERSISTENT_HANDLES)
2192 tcon->use_persistent = true;
2193 else /* persistent handles requested but not supported */ {
2194 cifs_dbg(VFS,
2195 "Persistent handles not supported on share\n");
2196 rc = -EOPNOTSUPP;
2197 goto out_fail;
2198 }
2199 } else if ((tcon->capabilities & SMB2_SHARE_CAP_CONTINUOUS_AVAILABILITY)
2200 && (ses->server->capabilities & SMB2_GLOBAL_CAP_PERSISTENT_HANDLES)
2201 && (ctx->nopersistent == false)) {
2202 cifs_dbg(FYI, "enabling persistent handles\n");
2203 tcon->use_persistent = true;
2204 } else if (ctx->resilient) {
2205 if (ses->server->vals->protocol_id == 0) {
2206 cifs_dbg(VFS,
2207 "SMB2.1 or later required for resilient handles\n");
2208 rc = -EOPNOTSUPP;
2209 goto out_fail;
2210 }
2211 tcon->use_resilient = true;
2212 }
2213
2214 tcon->use_witness = false;
2215 if (IS_ENABLED(CONFIG_CIFS_SWN_UPCALL) && ctx->witness) {
2216 if (ses->server->vals->protocol_id >= SMB30_PROT_ID) {
2217 if (tcon->capabilities & SMB2_SHARE_CAP_CLUSTER) {
2218 /*
2219 * Set witness in use flag in first place
2220 * to retry registration in the echo task
2221 */
2222 tcon->use_witness = true;
2223 /* And try to register immediately */
2224 rc = cifs_swn_register(tcon);
2225 if (rc < 0) {
2226 cifs_dbg(VFS, "Failed to register for witness notifications: %d\n", rc);
2227 goto out_fail;
2228 }
2229 } else {
2230 /* TODO: try to extend for non-cluster uses (eg multichannel) */
2231 cifs_dbg(VFS, "witness requested on mount but no CLUSTER capability on share\n");
2232 rc = -EOPNOTSUPP;
2233 goto out_fail;
2234 }
2235 } else {
2236 cifs_dbg(VFS, "SMB3 or later required for witness option\n");
2237 rc = -EOPNOTSUPP;
2238 goto out_fail;
2239 }
2240 }
2241
2242 /* If the user really knows what they are doing they can override */
2243 if (tcon->share_flags & SMB2_SHAREFLAG_NO_CACHING) {
2244 if (ctx->cache_ro)
2245 cifs_dbg(VFS, "cache=ro requested on mount but NO_CACHING flag set on share\n");
2246 else if (ctx->cache_rw)
2247 cifs_dbg(VFS, "cache=singleclient requested on mount but NO_CACHING flag set on share\n");
2248 }
2249
2250 if (ctx->no_lease) {
2251 if (ses->server->vals->protocol_id == 0) {
2252 cifs_dbg(VFS,
2253 "SMB2 or later required for nolease option\n");
2254 rc = -EOPNOTSUPP;
2255 goto out_fail;
2256 } else
2257 tcon->no_lease = ctx->no_lease;
2258 }
2259
2260 /*
2261 * We can have only one retry value for a connection to a share so for
2262 * resources mounted more than once to the same server share the last
2263 * value passed in for the retry flag is used.
2264 */
2265 tcon->retry = ctx->retry;
2266 tcon->nocase = ctx->nocase;
2267 if (ses->server->capabilities & SMB2_GLOBAL_CAP_DIRECTORY_LEASING)
2268 tcon->nohandlecache = ctx->nohandlecache;
2269 else
2270 tcon->nohandlecache = true;
2271 tcon->nodelete = ctx->nodelete;
2272 tcon->local_lease = ctx->local_lease;
2273 INIT_LIST_HEAD(&tcon->pending_opens);
2274
2275 spin_lock(&cifs_tcp_ses_lock);
2276 list_add(&tcon->tcon_list, &ses->tcon_list);
2277 spin_unlock(&cifs_tcp_ses_lock);
2278
2279 cifs_fscache_get_super_cookie(tcon);
2280
2281 return tcon;
2282
2283out_fail:
2284 tconInfoFree(tcon);
2285 return ERR_PTR(rc);
2286}
2287
2288void
2289cifs_put_tlink(struct tcon_link *tlink)
2290{
2291 if (!tlink || IS_ERR(tlink))
2292 return;
2293
2294 if (!atomic_dec_and_test(&tlink->tl_count) ||
2295 test_bit(TCON_LINK_IN_TREE, &tlink->tl_flags)) {
2296 tlink->tl_time = jiffies;
2297 return;
2298 }
2299
2300 if (!IS_ERR(tlink_tcon(tlink)))
2301 cifs_put_tcon(tlink_tcon(tlink));
2302 kfree(tlink);
2303 return;
2304}
2305
2306static int
2307compare_mount_options(struct super_block *sb, struct cifs_mnt_data *mnt_data)
2308{
2309 struct cifs_sb_info *old = CIFS_SB(sb);
2310 struct cifs_sb_info *new = mnt_data->cifs_sb;
2311 unsigned int oldflags = old->mnt_cifs_flags & CIFS_MOUNT_MASK;
2312 unsigned int newflags = new->mnt_cifs_flags & CIFS_MOUNT_MASK;
2313
2314 if ((sb->s_flags & CIFS_MS_MASK) != (mnt_data->flags & CIFS_MS_MASK))
2315 return 0;
2316
2317 if (old->mnt_cifs_serverino_autodisabled)
2318 newflags &= ~CIFS_MOUNT_SERVER_INUM;
2319
2320 if (oldflags != newflags)
2321 return 0;
2322
2323 /*
2324 * We want to share sb only if we don't specify an r/wsize or
2325 * specified r/wsize is greater than or equal to existing one.
2326 */
2327 if (new->ctx->wsize && new->ctx->wsize < old->ctx->wsize)
2328 return 0;
2329
2330 if (new->ctx->rsize && new->ctx->rsize < old->ctx->rsize)
2331 return 0;
2332
2333 if (!uid_eq(old->ctx->linux_uid, new->ctx->linux_uid) ||
2334 !gid_eq(old->ctx->linux_gid, new->ctx->linux_gid))
2335 return 0;
2336
2337 if (old->ctx->file_mode != new->ctx->file_mode ||
2338 old->ctx->dir_mode != new->ctx->dir_mode)
2339 return 0;
2340
2341 if (strcmp(old->local_nls->charset, new->local_nls->charset))
2342 return 0;
2343
2344 if (old->ctx->acregmax != new->ctx->acregmax)
2345 return 0;
2346 if (old->ctx->acdirmax != new->ctx->acdirmax)
2347 return 0;
2348
2349 return 1;
2350}
2351
2352static int
2353match_prepath(struct super_block *sb, struct cifs_mnt_data *mnt_data)
2354{
2355 struct cifs_sb_info *old = CIFS_SB(sb);
2356 struct cifs_sb_info *new = mnt_data->cifs_sb;
2357 bool old_set = (old->mnt_cifs_flags & CIFS_MOUNT_USE_PREFIX_PATH) &&
2358 old->prepath;
2359 bool new_set = (new->mnt_cifs_flags & CIFS_MOUNT_USE_PREFIX_PATH) &&
2360 new->prepath;
2361
2362 if (old_set && new_set && !strcmp(new->prepath, old->prepath))
2363 return 1;
2364 else if (!old_set && !new_set)
2365 return 1;
2366
2367 return 0;
2368}
2369
2370int
2371cifs_match_super(struct super_block *sb, void *data)
2372{
2373 struct cifs_mnt_data *mnt_data = (struct cifs_mnt_data *)data;
2374 struct smb3_fs_context *ctx;
2375 struct cifs_sb_info *cifs_sb;
2376 struct TCP_Server_Info *tcp_srv;
2377 struct cifs_ses *ses;
2378 struct cifs_tcon *tcon;
2379 struct tcon_link *tlink;
2380 int rc = 0;
2381
2382 spin_lock(&cifs_tcp_ses_lock);
2383 cifs_sb = CIFS_SB(sb);
2384 tlink = cifs_get_tlink(cifs_sb_master_tlink(cifs_sb));
2385 if (tlink == NULL) {
2386 /* can not match superblock if tlink were ever null */
2387 spin_unlock(&cifs_tcp_ses_lock);
2388 return 0;
2389 }
2390 tcon = tlink_tcon(tlink);
2391 ses = tcon->ses;
2392 tcp_srv = ses->server;
2393
2394 ctx = mnt_data->ctx;
2395
2396 if (!match_server(tcp_srv, ctx) ||
2397 !match_session(ses, ctx) ||
2398 !match_tcon(tcon, ctx) ||
2399 !match_prepath(sb, mnt_data)) {
2400 rc = 0;
2401 goto out;
2402 }
2403
2404 rc = compare_mount_options(sb, mnt_data);
2405out:
2406 spin_unlock(&cifs_tcp_ses_lock);
2407 cifs_put_tlink(tlink);
2408 return rc;
2409}
2410
2411#ifdef CONFIG_DEBUG_LOCK_ALLOC
2412static struct lock_class_key cifs_key[2];
2413static struct lock_class_key cifs_slock_key[2];
2414
2415static inline void
2416cifs_reclassify_socket4(struct socket *sock)
2417{
2418 struct sock *sk = sock->sk;
2419 BUG_ON(!sock_allow_reclassification(sk));
2420 sock_lock_init_class_and_name(sk, "slock-AF_INET-CIFS",
2421 &cifs_slock_key[0], "sk_lock-AF_INET-CIFS", &cifs_key[0]);
2422}
2423
2424static inline void
2425cifs_reclassify_socket6(struct socket *sock)
2426{
2427 struct sock *sk = sock->sk;
2428 BUG_ON(!sock_allow_reclassification(sk));
2429 sock_lock_init_class_and_name(sk, "slock-AF_INET6-CIFS",
2430 &cifs_slock_key[1], "sk_lock-AF_INET6-CIFS", &cifs_key[1]);
2431}
2432#else
2433static inline void
2434cifs_reclassify_socket4(struct socket *sock)
2435{
2436}
2437
2438static inline void
2439cifs_reclassify_socket6(struct socket *sock)
2440{
2441}
2442#endif
2443
2444/* See RFC1001 section 14 on representation of Netbios names */
2445static void rfc1002mangle(char *target, char *source, unsigned int length)
2446{
2447 unsigned int i, j;
2448
2449 for (i = 0, j = 0; i < (length); i++) {
2450 /* mask a nibble at a time and encode */
2451 target[j] = 'A' + (0x0F & (source[i] >> 4));
2452 target[j+1] = 'A' + (0x0F & source[i]);
2453 j += 2;
2454 }
2455
2456}
2457
2458static int
2459bind_socket(struct TCP_Server_Info *server)
2460{
2461 int rc = 0;
2462 if (server->srcaddr.ss_family != AF_UNSPEC) {
2463 /* Bind to the specified local IP address */
2464 struct socket *socket = server->ssocket;
2465 rc = socket->ops->bind(socket,
2466 (struct sockaddr *) &server->srcaddr,
2467 sizeof(server->srcaddr));
2468 if (rc < 0) {
2469 struct sockaddr_in *saddr4;
2470 struct sockaddr_in6 *saddr6;
2471 saddr4 = (struct sockaddr_in *)&server->srcaddr;
2472 saddr6 = (struct sockaddr_in6 *)&server->srcaddr;
2473 if (saddr6->sin6_family == AF_INET6)
2474 cifs_server_dbg(VFS, "Failed to bind to: %pI6c, error: %d\n",
2475 &saddr6->sin6_addr, rc);
2476 else
2477 cifs_server_dbg(VFS, "Failed to bind to: %pI4, error: %d\n",
2478 &saddr4->sin_addr.s_addr, rc);
2479 }
2480 }
2481 return rc;
2482}
2483
2484static int
2485ip_rfc1001_connect(struct TCP_Server_Info *server)
2486{
2487 int rc = 0;
2488 /*
2489 * some servers require RFC1001 sessinit before sending
2490 * negprot - BB check reconnection in case where second
2491 * sessinit is sent but no second negprot
2492 */
2493 struct rfc1002_session_packet *ses_init_buf;
2494 struct smb_hdr *smb_buf;
2495 ses_init_buf = kzalloc(sizeof(struct rfc1002_session_packet),
2496 GFP_KERNEL);
2497 if (ses_init_buf) {
2498 ses_init_buf->trailer.session_req.called_len = 32;
2499
2500 if (server->server_RFC1001_name[0] != 0)
2501 rfc1002mangle(ses_init_buf->trailer.
2502 session_req.called_name,
2503 server->server_RFC1001_name,
2504 RFC1001_NAME_LEN_WITH_NULL);
2505 else
2506 rfc1002mangle(ses_init_buf->trailer.
2507 session_req.called_name,
2508 DEFAULT_CIFS_CALLED_NAME,
2509 RFC1001_NAME_LEN_WITH_NULL);
2510
2511 ses_init_buf->trailer.session_req.calling_len = 32;
2512
2513 /*
2514 * calling name ends in null (byte 16) from old smb
2515 * convention.
2516 */
2517 if (server->workstation_RFC1001_name[0] != 0)
2518 rfc1002mangle(ses_init_buf->trailer.
2519 session_req.calling_name,
2520 server->workstation_RFC1001_name,
2521 RFC1001_NAME_LEN_WITH_NULL);
2522 else
2523 rfc1002mangle(ses_init_buf->trailer.
2524 session_req.calling_name,
2525 "LINUX_CIFS_CLNT",
2526 RFC1001_NAME_LEN_WITH_NULL);
2527
2528 ses_init_buf->trailer.session_req.scope1 = 0;
2529 ses_init_buf->trailer.session_req.scope2 = 0;
2530 smb_buf = (struct smb_hdr *)ses_init_buf;
2531
2532 /* sizeof RFC1002_SESSION_REQUEST with no scope */
2533 smb_buf->smb_buf_length = cpu_to_be32(0x81000044);
2534 rc = smb_send(server, smb_buf, 0x44);
2535 kfree(ses_init_buf);
2536 /*
2537 * RFC1001 layer in at least one server
2538 * requires very short break before negprot
2539 * presumably because not expecting negprot
2540 * to follow so fast. This is a simple
2541 * solution that works without
2542 * complicating the code and causes no
2543 * significant slowing down on mount
2544 * for everyone else
2545 */
2546 usleep_range(1000, 2000);
2547 }
2548 /*
2549 * else the negprot may still work without this
2550 * even though malloc failed
2551 */
2552
2553 return rc;
2554}
2555
2556static int
2557generic_ip_connect(struct TCP_Server_Info *server)
2558{
2559 int rc = 0;
2560 __be16 sport;
2561 int slen, sfamily;
2562 struct socket *socket = server->ssocket;
2563 struct sockaddr *saddr;
2564
2565 saddr = (struct sockaddr *) &server->dstaddr;
2566
2567 if (server->dstaddr.ss_family == AF_INET6) {
2568 struct sockaddr_in6 *ipv6 = (struct sockaddr_in6 *)&server->dstaddr;
2569
2570 sport = ipv6->sin6_port;
2571 slen = sizeof(struct sockaddr_in6);
2572 sfamily = AF_INET6;
2573 cifs_dbg(FYI, "%s: connecting to [%pI6]:%d\n", __func__, &ipv6->sin6_addr,
2574 ntohs(sport));
2575 } else {
2576 struct sockaddr_in *ipv4 = (struct sockaddr_in *)&server->dstaddr;
2577
2578 sport = ipv4->sin_port;
2579 slen = sizeof(struct sockaddr_in);
2580 sfamily = AF_INET;
2581 cifs_dbg(FYI, "%s: connecting to %pI4:%d\n", __func__, &ipv4->sin_addr,
2582 ntohs(sport));
2583 }
2584
2585 if (socket == NULL) {
2586 rc = __sock_create(cifs_net_ns(server), sfamily, SOCK_STREAM,
2587 IPPROTO_TCP, &socket, 1);
2588 if (rc < 0) {
2589 cifs_server_dbg(VFS, "Error %d creating socket\n", rc);
2590 server->ssocket = NULL;
2591 return rc;
2592 }
2593
2594 /* BB other socket options to set KEEPALIVE, NODELAY? */
2595 cifs_dbg(FYI, "Socket created\n");
2596 server->ssocket = socket;
2597 socket->sk->sk_allocation = GFP_NOFS;
2598 if (sfamily == AF_INET6)
2599 cifs_reclassify_socket6(socket);
2600 else
2601 cifs_reclassify_socket4(socket);
2602 }
2603
2604 rc = bind_socket(server);
2605 if (rc < 0)
2606 return rc;
2607
2608 /*
2609 * Eventually check for other socket options to change from
2610 * the default. sock_setsockopt not used because it expects
2611 * user space buffer
2612 */
2613 socket->sk->sk_rcvtimeo = 7 * HZ;
2614 socket->sk->sk_sndtimeo = 5 * HZ;
2615
2616 /* make the bufsizes depend on wsize/rsize and max requests */
2617 if (server->noautotune) {
2618 if (socket->sk->sk_sndbuf < (200 * 1024))
2619 socket->sk->sk_sndbuf = 200 * 1024;
2620 if (socket->sk->sk_rcvbuf < (140 * 1024))
2621 socket->sk->sk_rcvbuf = 140 * 1024;
2622 }
2623
2624 if (server->tcp_nodelay)
2625 tcp_sock_set_nodelay(socket->sk);
2626
2627 cifs_dbg(FYI, "sndbuf %d rcvbuf %d rcvtimeo 0x%lx\n",
2628 socket->sk->sk_sndbuf,
2629 socket->sk->sk_rcvbuf, socket->sk->sk_rcvtimeo);
2630
2631 rc = socket->ops->connect(socket, saddr, slen,
2632 server->noblockcnt ? O_NONBLOCK : 0);
2633 /*
2634 * When mounting SMB root file systems, we do not want to block in
2635 * connect. Otherwise bail out and then let cifs_reconnect() perform
2636 * reconnect failover - if possible.
2637 */
2638 if (server->noblockcnt && rc == -EINPROGRESS)
2639 rc = 0;
2640 if (rc < 0) {
2641 cifs_dbg(FYI, "Error %d connecting to server\n", rc);
2642 sock_release(socket);
2643 server->ssocket = NULL;
2644 return rc;
2645 }
2646
2647 if (sport == htons(RFC1001_PORT))
2648 rc = ip_rfc1001_connect(server);
2649
2650 return rc;
2651}
2652
2653static int
2654ip_connect(struct TCP_Server_Info *server)
2655{
2656 __be16 *sport;
2657 struct sockaddr_in6 *addr6 = (struct sockaddr_in6 *)&server->dstaddr;
2658 struct sockaddr_in *addr = (struct sockaddr_in *)&server->dstaddr;
2659
2660 if (server->dstaddr.ss_family == AF_INET6)
2661 sport = &addr6->sin6_port;
2662 else
2663 sport = &addr->sin_port;
2664
2665 if (*sport == 0) {
2666 int rc;
2667
2668 /* try with 445 port at first */
2669 *sport = htons(CIFS_PORT);
2670
2671 rc = generic_ip_connect(server);
2672 if (rc >= 0)
2673 return rc;
2674
2675 /* if it failed, try with 139 port */
2676 *sport = htons(RFC1001_PORT);
2677 }
2678
2679 return generic_ip_connect(server);
2680}
2681
2682void reset_cifs_unix_caps(unsigned int xid, struct cifs_tcon *tcon,
2683 struct cifs_sb_info *cifs_sb, struct smb3_fs_context *ctx)
2684{
2685 /*
2686 * If we are reconnecting then should we check to see if
2687 * any requested capabilities changed locally e.g. via
2688 * remount but we can not do much about it here
2689 * if they have (even if we could detect it by the following)
2690 * Perhaps we could add a backpointer to array of sb from tcon
2691 * or if we change to make all sb to same share the same
2692 * sb as NFS - then we only have one backpointer to sb.
2693 * What if we wanted to mount the server share twice once with
2694 * and once without posixacls or posix paths?
2695 */
2696 __u64 saved_cap = le64_to_cpu(tcon->fsUnixInfo.Capability);
2697
2698 if (ctx && ctx->no_linux_ext) {
2699 tcon->fsUnixInfo.Capability = 0;
2700 tcon->unix_ext = 0; /* Unix Extensions disabled */
2701 cifs_dbg(FYI, "Linux protocol extensions disabled\n");
2702 return;
2703 } else if (ctx)
2704 tcon->unix_ext = 1; /* Unix Extensions supported */
2705
2706 if (!tcon->unix_ext) {
2707 cifs_dbg(FYI, "Unix extensions disabled so not set on reconnect\n");
2708 return;
2709 }
2710
2711 if (!CIFSSMBQFSUnixInfo(xid, tcon)) {
2712 __u64 cap = le64_to_cpu(tcon->fsUnixInfo.Capability);
2713 cifs_dbg(FYI, "unix caps which server supports %lld\n", cap);
2714 /*
2715 * check for reconnect case in which we do not
2716 * want to change the mount behavior if we can avoid it
2717 */
2718 if (ctx == NULL) {
2719 /*
2720 * turn off POSIX ACL and PATHNAMES if not set
2721 * originally at mount time
2722 */
2723 if ((saved_cap & CIFS_UNIX_POSIX_ACL_CAP) == 0)
2724 cap &= ~CIFS_UNIX_POSIX_ACL_CAP;
2725 if ((saved_cap & CIFS_UNIX_POSIX_PATHNAMES_CAP) == 0) {
2726 if (cap & CIFS_UNIX_POSIX_PATHNAMES_CAP)
2727 cifs_dbg(VFS, "POSIXPATH support change\n");
2728 cap &= ~CIFS_UNIX_POSIX_PATHNAMES_CAP;
2729 } else if ((cap & CIFS_UNIX_POSIX_PATHNAMES_CAP) == 0) {
2730 cifs_dbg(VFS, "possible reconnect error\n");
2731 cifs_dbg(VFS, "server disabled POSIX path support\n");
2732 }
2733 }
2734
2735 if (cap & CIFS_UNIX_TRANSPORT_ENCRYPTION_MANDATORY_CAP)
2736 cifs_dbg(VFS, "per-share encryption not supported yet\n");
2737
2738 cap &= CIFS_UNIX_CAP_MASK;
2739 if (ctx && ctx->no_psx_acl)
2740 cap &= ~CIFS_UNIX_POSIX_ACL_CAP;
2741 else if (CIFS_UNIX_POSIX_ACL_CAP & cap) {
2742 cifs_dbg(FYI, "negotiated posix acl support\n");
2743 if (cifs_sb)
2744 cifs_sb->mnt_cifs_flags |=
2745 CIFS_MOUNT_POSIXACL;
2746 }
2747
2748 if (ctx && ctx->posix_paths == 0)
2749 cap &= ~CIFS_UNIX_POSIX_PATHNAMES_CAP;
2750 else if (cap & CIFS_UNIX_POSIX_PATHNAMES_CAP) {
2751 cifs_dbg(FYI, "negotiate posix pathnames\n");
2752 if (cifs_sb)
2753 cifs_sb->mnt_cifs_flags |=
2754 CIFS_MOUNT_POSIX_PATHS;
2755 }
2756
2757 cifs_dbg(FYI, "Negotiate caps 0x%x\n", (int)cap);
2758#ifdef CONFIG_CIFS_DEBUG2
2759 if (cap & CIFS_UNIX_FCNTL_CAP)
2760 cifs_dbg(FYI, "FCNTL cap\n");
2761 if (cap & CIFS_UNIX_EXTATTR_CAP)
2762 cifs_dbg(FYI, "EXTATTR cap\n");
2763 if (cap & CIFS_UNIX_POSIX_PATHNAMES_CAP)
2764 cifs_dbg(FYI, "POSIX path cap\n");
2765 if (cap & CIFS_UNIX_XATTR_CAP)
2766 cifs_dbg(FYI, "XATTR cap\n");
2767 if (cap & CIFS_UNIX_POSIX_ACL_CAP)
2768 cifs_dbg(FYI, "POSIX ACL cap\n");
2769 if (cap & CIFS_UNIX_LARGE_READ_CAP)
2770 cifs_dbg(FYI, "very large read cap\n");
2771 if (cap & CIFS_UNIX_LARGE_WRITE_CAP)
2772 cifs_dbg(FYI, "very large write cap\n");
2773 if (cap & CIFS_UNIX_TRANSPORT_ENCRYPTION_CAP)
2774 cifs_dbg(FYI, "transport encryption cap\n");
2775 if (cap & CIFS_UNIX_TRANSPORT_ENCRYPTION_MANDATORY_CAP)
2776 cifs_dbg(FYI, "mandatory transport encryption cap\n");
2777#endif /* CIFS_DEBUG2 */
2778 if (CIFSSMBSetFSUnixInfo(xid, tcon, cap)) {
2779 if (ctx == NULL)
2780 cifs_dbg(FYI, "resetting capabilities failed\n");
2781 else
2782 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");
2783
2784 }
2785 }
2786}
2787
2788int cifs_setup_cifs_sb(struct cifs_sb_info *cifs_sb)
2789{
2790 struct smb3_fs_context *ctx = cifs_sb->ctx;
2791
2792 INIT_DELAYED_WORK(&cifs_sb->prune_tlinks, cifs_prune_tlinks);
2793
2794 spin_lock_init(&cifs_sb->tlink_tree_lock);
2795 cifs_sb->tlink_tree = RB_ROOT;
2796
2797 cifs_dbg(FYI, "file mode: %04ho dir mode: %04ho\n",
2798 ctx->file_mode, ctx->dir_mode);
2799
2800 /* this is needed for ASCII cp to Unicode converts */
2801 if (ctx->iocharset == NULL) {
2802 /* load_nls_default cannot return null */
2803 cifs_sb->local_nls = load_nls_default();
2804 } else {
2805 cifs_sb->local_nls = load_nls(ctx->iocharset);
2806 if (cifs_sb->local_nls == NULL) {
2807 cifs_dbg(VFS, "CIFS mount error: iocharset %s not found\n",
2808 ctx->iocharset);
2809 return -ELIBACC;
2810 }
2811 }
2812 ctx->local_nls = cifs_sb->local_nls;
2813
2814 smb3_update_mnt_flags(cifs_sb);
2815
2816 if (ctx->direct_io)
2817 cifs_dbg(FYI, "mounting share using direct i/o\n");
2818 if (ctx->cache_ro) {
2819 cifs_dbg(VFS, "mounting share with read only caching. Ensure that the share will not be modified while in use.\n");
2820 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_RO_CACHE;
2821 } else if (ctx->cache_rw) {
2822 cifs_dbg(VFS, "mounting share in single client RW caching mode. Ensure that no other systems will be accessing the share.\n");
2823 cifs_sb->mnt_cifs_flags |= (CIFS_MOUNT_RO_CACHE |
2824 CIFS_MOUNT_RW_CACHE);
2825 }
2826
2827 if ((ctx->cifs_acl) && (ctx->dynperm))
2828 cifs_dbg(VFS, "mount option dynperm ignored if cifsacl mount option supported\n");
2829
2830 if (ctx->prepath) {
2831 cifs_sb->prepath = kstrdup(ctx->prepath, GFP_KERNEL);
2832 if (cifs_sb->prepath == NULL)
2833 return -ENOMEM;
2834 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_USE_PREFIX_PATH;
2835 }
2836
2837 return 0;
2838}
2839
2840/* Release all succeed connections */
2841static inline void mount_put_conns(struct cifs_sb_info *cifs_sb,
2842 unsigned int xid,
2843 struct TCP_Server_Info *server,
2844 struct cifs_ses *ses, struct cifs_tcon *tcon)
2845{
2846 int rc = 0;
2847
2848 if (tcon)
2849 cifs_put_tcon(tcon);
2850 else if (ses)
2851 cifs_put_smb_ses(ses);
2852 else if (server)
2853 cifs_put_tcp_session(server, 0);
2854 cifs_sb->mnt_cifs_flags &= ~CIFS_MOUNT_POSIX_PATHS;
2855 free_xid(xid);
2856}
2857
2858/* Get connections for tcp, ses and tcon */
2859static int mount_get_conns(struct smb3_fs_context *ctx, struct cifs_sb_info *cifs_sb,
2860 unsigned int *xid,
2861 struct TCP_Server_Info **nserver,
2862 struct cifs_ses **nses, struct cifs_tcon **ntcon)
2863{
2864 int rc = 0;
2865 struct TCP_Server_Info *server;
2866 struct cifs_ses *ses;
2867 struct cifs_tcon *tcon;
2868
2869 *nserver = NULL;
2870 *nses = NULL;
2871 *ntcon = NULL;
2872
2873 *xid = get_xid();
2874
2875 /* get a reference to a tcp session */
2876 server = cifs_get_tcp_session(ctx);
2877 if (IS_ERR(server)) {
2878 rc = PTR_ERR(server);
2879 return rc;
2880 }
2881
2882 *nserver = server;
2883
2884 /* get a reference to a SMB session */
2885 ses = cifs_get_smb_ses(server, ctx);
2886 if (IS_ERR(ses)) {
2887 rc = PTR_ERR(ses);
2888 return rc;
2889 }
2890
2891 *nses = ses;
2892
2893 if ((ctx->persistent == true) && (!(ses->server->capabilities &
2894 SMB2_GLOBAL_CAP_PERSISTENT_HANDLES))) {
2895 cifs_server_dbg(VFS, "persistent handles not supported by server\n");
2896 return -EOPNOTSUPP;
2897 }
2898
2899 /* search for existing tcon to this server share */
2900 tcon = cifs_get_tcon(ses, ctx);
2901 if (IS_ERR(tcon)) {
2902 rc = PTR_ERR(tcon);
2903 return rc;
2904 }
2905
2906 *ntcon = tcon;
2907
2908 /* if new SMB3.11 POSIX extensions are supported do not remap / and \ */
2909 if (tcon->posix_extensions)
2910 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_POSIX_PATHS;
2911
2912 /* tell server which Unix caps we support */
2913 if (cap_unix(tcon->ses)) {
2914 /*
2915 * reset of caps checks mount to see if unix extensions disabled
2916 * for just this mount.
2917 */
2918 reset_cifs_unix_caps(*xid, tcon, cifs_sb, ctx);
2919 if ((tcon->ses->server->tcpStatus == CifsNeedReconnect) &&
2920 (le64_to_cpu(tcon->fsUnixInfo.Capability) &
2921 CIFS_UNIX_TRANSPORT_ENCRYPTION_MANDATORY_CAP))
2922 return -EACCES;
2923 } else
2924 tcon->unix_ext = 0; /* server does not support them */
2925
2926 /* do not care if a following call succeed - informational */
2927 if (!tcon->pipe && server->ops->qfs_tcon) {
2928 server->ops->qfs_tcon(*xid, tcon, cifs_sb);
2929 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_RO_CACHE) {
2930 if (tcon->fsDevInfo.DeviceCharacteristics &
2931 cpu_to_le32(FILE_READ_ONLY_DEVICE))
2932 cifs_dbg(VFS, "mounted to read only share\n");
2933 else if ((cifs_sb->mnt_cifs_flags &
2934 CIFS_MOUNT_RW_CACHE) == 0)
2935 cifs_dbg(VFS, "read only mount of RW share\n");
2936 /* no need to log a RW mount of a typical RW share */
2937 }
2938 }
2939
2940 /*
2941 * Clamp the rsize/wsize mount arguments if they are too big for the server
2942 * and set the rsize/wsize to the negotiated values if not passed in by
2943 * the user on mount
2944 */
2945 if ((cifs_sb->ctx->wsize == 0) ||
2946 (cifs_sb->ctx->wsize > server->ops->negotiate_wsize(tcon, ctx)))
2947 cifs_sb->ctx->wsize = server->ops->negotiate_wsize(tcon, ctx);
2948 if ((cifs_sb->ctx->rsize == 0) ||
2949 (cifs_sb->ctx->rsize > server->ops->negotiate_rsize(tcon, ctx)))
2950 cifs_sb->ctx->rsize = server->ops->negotiate_rsize(tcon, ctx);
2951
2952 return 0;
2953}
2954
2955static int mount_setup_tlink(struct cifs_sb_info *cifs_sb, struct cifs_ses *ses,
2956 struct cifs_tcon *tcon)
2957{
2958 struct tcon_link *tlink;
2959
2960 /* hang the tcon off of the superblock */
2961 tlink = kzalloc(sizeof(*tlink), GFP_KERNEL);
2962 if (tlink == NULL)
2963 return -ENOMEM;
2964
2965 tlink->tl_uid = ses->linux_uid;
2966 tlink->tl_tcon = tcon;
2967 tlink->tl_time = jiffies;
2968 set_bit(TCON_LINK_MASTER, &tlink->tl_flags);
2969 set_bit(TCON_LINK_IN_TREE, &tlink->tl_flags);
2970
2971 cifs_sb->master_tlink = tlink;
2972 spin_lock(&cifs_sb->tlink_tree_lock);
2973 tlink_rb_insert(&cifs_sb->tlink_tree, tlink);
2974 spin_unlock(&cifs_sb->tlink_tree_lock);
2975
2976 queue_delayed_work(cifsiod_wq, &cifs_sb->prune_tlinks,
2977 TLINK_IDLE_EXPIRE);
2978 return 0;
2979}
2980
2981#ifdef CONFIG_CIFS_DFS_UPCALL
2982static int mount_get_dfs_conns(struct smb3_fs_context *ctx, struct cifs_sb_info *cifs_sb,
2983 unsigned int *xid, struct TCP_Server_Info **nserver,
2984 struct cifs_ses **nses, struct cifs_tcon **ntcon)
2985{
2986 int rc;
2987
2988 ctx->nosharesock = true;
2989 rc = mount_get_conns(ctx, cifs_sb, xid, nserver, nses, ntcon);
2990 if (*nserver) {
2991 cifs_dbg(FYI, "%s: marking tcp session as a dfs connection\n", __func__);
2992 spin_lock(&cifs_tcp_ses_lock);
2993 (*nserver)->is_dfs_conn = true;
2994 spin_unlock(&cifs_tcp_ses_lock);
2995 }
2996 return rc;
2997}
2998
2999/*
3000 * cifs_build_path_to_root returns full path to root when we do not have an
3001 * existing connection (tcon)
3002 */
3003static char *
3004build_unc_path_to_root(const struct smb3_fs_context *ctx,
3005 const struct cifs_sb_info *cifs_sb, bool useppath)
3006{
3007 char *full_path, *pos;
3008 unsigned int pplen = useppath && ctx->prepath ?
3009 strlen(ctx->prepath) + 1 : 0;
3010 unsigned int unc_len = strnlen(ctx->UNC, MAX_TREE_SIZE + 1);
3011
3012 if (unc_len > MAX_TREE_SIZE)
3013 return ERR_PTR(-EINVAL);
3014
3015 full_path = kmalloc(unc_len + pplen + 1, GFP_KERNEL);
3016 if (full_path == NULL)
3017 return ERR_PTR(-ENOMEM);
3018
3019 memcpy(full_path, ctx->UNC, unc_len);
3020 pos = full_path + unc_len;
3021
3022 if (pplen) {
3023 *pos = CIFS_DIR_SEP(cifs_sb);
3024 memcpy(pos + 1, ctx->prepath, pplen);
3025 pos += pplen;
3026 }
3027
3028 *pos = '\0'; /* add trailing null */
3029 convert_delimiter(full_path, CIFS_DIR_SEP(cifs_sb));
3030 cifs_dbg(FYI, "%s: full_path=%s\n", __func__, full_path);
3031 return full_path;
3032}
3033
3034/**
3035 * expand_dfs_referral - Perform a dfs referral query and update the cifs_sb
3036 *
3037 * If a referral is found, cifs_sb->ctx->mount_options will be (re-)allocated
3038 * to a string containing updated options for the submount. Otherwise it
3039 * will be left untouched.
3040 *
3041 * Returns the rc from get_dfs_path to the caller, which can be used to
3042 * determine whether there were referrals.
3043 */
3044static int
3045expand_dfs_referral(const unsigned int xid, struct cifs_ses *ses,
3046 struct smb3_fs_context *ctx, struct cifs_sb_info *cifs_sb,
3047 char *ref_path)
3048{
3049 int rc;
3050 struct dfs_info3_param referral = {0};
3051 char *full_path = NULL, *mdata = NULL;
3052
3053 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_DFS)
3054 return -EREMOTE;
3055
3056 full_path = build_unc_path_to_root(ctx, cifs_sb, true);
3057 if (IS_ERR(full_path))
3058 return PTR_ERR(full_path);
3059
3060 rc = dfs_cache_find(xid, ses, cifs_sb->local_nls, cifs_remap(cifs_sb),
3061 ref_path, &referral, NULL);
3062 if (!rc) {
3063 char *fake_devname = NULL;
3064
3065 mdata = cifs_compose_mount_options(cifs_sb->ctx->mount_options,
3066 full_path + 1, &referral,
3067 &fake_devname);
3068 free_dfs_info_param(&referral);
3069
3070 if (IS_ERR(mdata)) {
3071 rc = PTR_ERR(mdata);
3072 mdata = NULL;
3073 } else {
3074 /*
3075 * We can not clear out the whole structure since we
3076 * no longer have an explicit function to parse
3077 * a mount-string. Instead we need to clear out the
3078 * individual fields that are no longer valid.
3079 */
3080 kfree(ctx->prepath);
3081 ctx->prepath = NULL;
3082 rc = cifs_setup_volume_info(ctx, mdata, fake_devname);
3083 }
3084 kfree(fake_devname);
3085 kfree(cifs_sb->ctx->mount_options);
3086 cifs_sb->ctx->mount_options = mdata;
3087 }
3088 kfree(full_path);
3089 return rc;
3090}
3091
3092static int get_next_dfs_tgt(struct dfs_cache_tgt_list *tgt_list,
3093 struct dfs_cache_tgt_iterator **tgt_it)
3094{
3095 if (!*tgt_it)
3096 *tgt_it = dfs_cache_get_tgt_iterator(tgt_list);
3097 else
3098 *tgt_it = dfs_cache_get_next_tgt(tgt_list, *tgt_it);
3099 return !*tgt_it ? -EHOSTDOWN : 0;
3100}
3101
3102static int update_vol_info(const struct dfs_cache_tgt_iterator *tgt_it,
3103 struct smb3_fs_context *fake_ctx, struct smb3_fs_context *ctx)
3104{
3105 const char *tgt = dfs_cache_get_tgt_name(tgt_it);
3106 int len = strlen(tgt) + 2;
3107 char *new_unc;
3108
3109 new_unc = kmalloc(len, GFP_KERNEL);
3110 if (!new_unc)
3111 return -ENOMEM;
3112 scnprintf(new_unc, len, "\\%s", tgt);
3113
3114 kfree(ctx->UNC);
3115 ctx->UNC = new_unc;
3116
3117 if (fake_ctx->prepath) {
3118 kfree(ctx->prepath);
3119 ctx->prepath = fake_ctx->prepath;
3120 fake_ctx->prepath = NULL;
3121 }
3122 memcpy(&ctx->dstaddr, &fake_ctx->dstaddr, sizeof(ctx->dstaddr));
3123
3124 return 0;
3125}
3126
3127static int do_dfs_failover(const char *path, const char *full_path, struct cifs_sb_info *cifs_sb,
3128 struct smb3_fs_context *ctx, struct cifs_ses *root_ses,
3129 unsigned int *xid, struct TCP_Server_Info **server,
3130 struct cifs_ses **ses, struct cifs_tcon **tcon)
3131{
3132 int rc;
3133 char *npath = NULL;
3134 struct dfs_cache_tgt_list tgt_list = DFS_CACHE_TGT_LIST_INIT(tgt_list);
3135 struct dfs_cache_tgt_iterator *tgt_it = NULL;
3136 struct smb3_fs_context tmp_ctx = {NULL};
3137
3138 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_DFS)
3139 return -EOPNOTSUPP;
3140
3141 npath = dfs_cache_canonical_path(path, cifs_sb->local_nls, cifs_remap(cifs_sb));
3142 if (IS_ERR(npath))
3143 return PTR_ERR(npath);
3144
3145 cifs_dbg(FYI, "%s: path=%s full_path=%s\n", __func__, npath, full_path);
3146
3147 rc = dfs_cache_noreq_find(npath, NULL, &tgt_list);
3148 if (rc)
3149 goto out;
3150 /*
3151 * We use a 'tmp_ctx' here because we need pass it down to the mount_{get,put} functions to
3152 * test connection against new DFS targets.
3153 */
3154 rc = smb3_fs_context_dup(&tmp_ctx, ctx);
3155 if (rc)
3156 goto out;
3157
3158 for (;;) {
3159 struct dfs_info3_param ref = {0};
3160 char *fake_devname = NULL, *mdata = NULL;
3161
3162 /* Get next DFS target server - if any */
3163 rc = get_next_dfs_tgt(&tgt_list, &tgt_it);
3164 if (rc)
3165 break;
3166
3167 rc = dfs_cache_get_tgt_referral(npath, tgt_it, &ref);
3168 if (rc)
3169 break;
3170
3171 cifs_dbg(FYI, "%s: old ctx: UNC=%s prepath=%s\n", __func__, tmp_ctx.UNC,
3172 tmp_ctx.prepath);
3173
3174 mdata = cifs_compose_mount_options(cifs_sb->ctx->mount_options, full_path + 1, &ref,
3175 &fake_devname);
3176 free_dfs_info_param(&ref);
3177
3178 if (IS_ERR(mdata)) {
3179 rc = PTR_ERR(mdata);
3180 mdata = NULL;
3181 } else
3182 rc = cifs_setup_volume_info(&tmp_ctx, mdata, fake_devname);
3183
3184 kfree(mdata);
3185 kfree(fake_devname);
3186
3187 if (rc)
3188 break;
3189
3190 cifs_dbg(FYI, "%s: new ctx: UNC=%s prepath=%s\n", __func__, tmp_ctx.UNC,
3191 tmp_ctx.prepath);
3192
3193 mount_put_conns(cifs_sb, *xid, *server, *ses, *tcon);
3194 rc = mount_get_dfs_conns(&tmp_ctx, cifs_sb, xid, server, ses, tcon);
3195 if (!rc || (*server && *ses)) {
3196 /*
3197 * We were able to connect to new target server. Update current context with
3198 * new target server.
3199 */
3200 rc = update_vol_info(tgt_it, &tmp_ctx, ctx);
3201 break;
3202 }
3203 }
3204 if (!rc) {
3205 cifs_dbg(FYI, "%s: final ctx: UNC=%s prepath=%s\n", __func__, tmp_ctx.UNC,
3206 tmp_ctx.prepath);
3207 /*
3208 * Update DFS target hint in DFS referral cache with the target server we
3209 * successfully reconnected to.
3210 */
3211 rc = dfs_cache_update_tgthint(*xid, root_ses ? root_ses : *ses, cifs_sb->local_nls,
3212 cifs_remap(cifs_sb), path, tgt_it);
3213 }
3214
3215out:
3216 kfree(npath);
3217 smb3_cleanup_fs_context_contents(&tmp_ctx);
3218 dfs_cache_free_tgts(&tgt_list);
3219 return rc;
3220}
3221#endif
3222
3223/* TODO: all callers to this are broken. We are not parsing mount_options here
3224 * we should pass a clone of the original context?
3225 */
3226int
3227cifs_setup_volume_info(struct smb3_fs_context *ctx, const char *mntopts, const char *devname)
3228{
3229 int rc;
3230
3231 if (devname) {
3232 cifs_dbg(FYI, "%s: devname=%s\n", __func__, devname);
3233 rc = smb3_parse_devname(devname, ctx);
3234 if (rc) {
3235 cifs_dbg(VFS, "%s: failed to parse %s: %d\n", __func__, devname, rc);
3236 return rc;
3237 }
3238 }
3239
3240 if (mntopts) {
3241 char *ip;
3242
3243 rc = smb3_parse_opt(mntopts, "ip", &ip);
3244 if (rc) {
3245 cifs_dbg(VFS, "%s: failed to parse ip options: %d\n", __func__, rc);
3246 return rc;
3247 }
3248
3249 rc = cifs_convert_address((struct sockaddr *)&ctx->dstaddr, ip, strlen(ip));
3250 kfree(ip);
3251 if (!rc) {
3252 cifs_dbg(VFS, "%s: failed to convert ip address\n", __func__);
3253 return -EINVAL;
3254 }
3255 }
3256
3257 if (ctx->nullauth) {
3258 cifs_dbg(FYI, "Anonymous login\n");
3259 kfree(ctx->username);
3260 ctx->username = NULL;
3261 } else if (ctx->username) {
3262 /* BB fixme parse for domain name here */
3263 cifs_dbg(FYI, "Username: %s\n", ctx->username);
3264 } else {
3265 cifs_dbg(VFS, "No username specified\n");
3266 /* In userspace mount helper we can get user name from alternate
3267 locations such as env variables and files on disk */
3268 return -EINVAL;
3269 }
3270
3271 return 0;
3272}
3273
3274static int
3275cifs_are_all_path_components_accessible(struct TCP_Server_Info *server,
3276 unsigned int xid,
3277 struct cifs_tcon *tcon,
3278 struct cifs_sb_info *cifs_sb,
3279 char *full_path,
3280 int added_treename)
3281{
3282 int rc;
3283 char *s;
3284 char sep, tmp;
3285 int skip = added_treename ? 1 : 0;
3286
3287 sep = CIFS_DIR_SEP(cifs_sb);
3288 s = full_path;
3289
3290 rc = server->ops->is_path_accessible(xid, tcon, cifs_sb, "");
3291 while (rc == 0) {
3292 /* skip separators */
3293 while (*s == sep)
3294 s++;
3295 if (!*s)
3296 break;
3297 /* next separator */
3298 while (*s && *s != sep)
3299 s++;
3300 /*
3301 * if the treename is added, we then have to skip the first
3302 * part within the separators
3303 */
3304 if (skip) {
3305 skip = 0;
3306 continue;
3307 }
3308 /*
3309 * temporarily null-terminate the path at the end of
3310 * the current component
3311 */
3312 tmp = *s;
3313 *s = 0;
3314 rc = server->ops->is_path_accessible(xid, tcon, cifs_sb,
3315 full_path);
3316 *s = tmp;
3317 }
3318 return rc;
3319}
3320
3321/*
3322 * Check if path is remote (e.g. a DFS share). Return -EREMOTE if it is,
3323 * otherwise 0.
3324 */
3325static int is_path_remote(struct cifs_sb_info *cifs_sb, struct smb3_fs_context *ctx,
3326 const unsigned int xid,
3327 struct TCP_Server_Info *server,
3328 struct cifs_tcon *tcon)
3329{
3330 int rc;
3331 char *full_path;
3332
3333 if (!server->ops->is_path_accessible)
3334 return -EOPNOTSUPP;
3335
3336 /*
3337 * cifs_build_path_to_root works only when we have a valid tcon
3338 */
3339 full_path = cifs_build_path_to_root(ctx, cifs_sb, tcon,
3340 tcon->Flags & SMB_SHARE_IS_IN_DFS);
3341 if (full_path == NULL)
3342 return -ENOMEM;
3343
3344 cifs_dbg(FYI, "%s: full_path: %s\n", __func__, full_path);
3345
3346 rc = server->ops->is_path_accessible(xid, tcon, cifs_sb,
3347 full_path);
3348 if (rc != 0 && rc != -EREMOTE) {
3349 kfree(full_path);
3350 return rc;
3351 }
3352
3353 if (rc != -EREMOTE) {
3354 rc = cifs_are_all_path_components_accessible(server, xid, tcon,
3355 cifs_sb, full_path, tcon->Flags & SMB_SHARE_IS_IN_DFS);
3356 if (rc != 0) {
3357 cifs_server_dbg(VFS, "cannot query dirs between root and final path, enabling CIFS_MOUNT_USE_PREFIX_PATH\n");
3358 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_USE_PREFIX_PATH;
3359 rc = 0;
3360 }
3361 }
3362
3363 kfree(full_path);
3364 return rc;
3365}
3366
3367#ifdef CONFIG_CIFS_DFS_UPCALL
3368static void set_root_ses(struct cifs_sb_info *cifs_sb, const uuid_t *mount_id, struct cifs_ses *ses,
3369 struct cifs_ses **root_ses)
3370{
3371 if (ses) {
3372 spin_lock(&cifs_tcp_ses_lock);
3373 ses->ses_count++;
3374 spin_unlock(&cifs_tcp_ses_lock);
3375 dfs_cache_add_refsrv_session(mount_id, ses);
3376 }
3377 *root_ses = ses;
3378}
3379
3380/* Set up next dfs prefix path in @dfs_path */
3381static int next_dfs_prepath(struct cifs_sb_info *cifs_sb, struct smb3_fs_context *ctx,
3382 const unsigned int xid, struct TCP_Server_Info *server,
3383 struct cifs_tcon *tcon, char **dfs_path)
3384{
3385 char *path, *npath;
3386 int added_treename = is_tcon_dfs(tcon);
3387 int rc;
3388
3389 path = cifs_build_path_to_root(ctx, cifs_sb, tcon, added_treename);
3390 if (!path)
3391 return -ENOMEM;
3392
3393 rc = is_path_remote(cifs_sb, ctx, xid, server, tcon);
3394 if (rc == -EREMOTE) {
3395 struct smb3_fs_context v = {NULL};
3396 /* if @path contains a tree name, skip it in the prefix path */
3397 if (added_treename) {
3398 rc = smb3_parse_devname(path, &v);
3399 if (rc)
3400 goto out;
3401 npath = build_unc_path_to_root(&v, cifs_sb, true);
3402 smb3_cleanup_fs_context_contents(&v);
3403 } else {
3404 v.UNC = ctx->UNC;
3405 v.prepath = path + 1;
3406 npath = build_unc_path_to_root(&v, cifs_sb, true);
3407 }
3408
3409 if (IS_ERR(npath)) {
3410 rc = PTR_ERR(npath);
3411 goto out;
3412 }
3413
3414 kfree(*dfs_path);
3415 *dfs_path = npath;
3416 rc = -EREMOTE;
3417 }
3418
3419out:
3420 kfree(path);
3421 return rc;
3422}
3423
3424/* Check if resolved targets can handle any DFS referrals */
3425static int is_referral_server(const char *ref_path, struct cifs_sb_info *cifs_sb,
3426 struct cifs_tcon *tcon, bool *ref_server)
3427{
3428 int rc;
3429 struct dfs_info3_param ref = {0};
3430
3431 cifs_dbg(FYI, "%s: ref_path=%s\n", __func__, ref_path);
3432
3433 if (is_tcon_dfs(tcon)) {
3434 *ref_server = true;
3435 } else {
3436 char *npath;
3437
3438 npath = dfs_cache_canonical_path(ref_path, cifs_sb->local_nls, cifs_remap(cifs_sb));
3439 if (IS_ERR(npath))
3440 return PTR_ERR(npath);
3441
3442 rc = dfs_cache_noreq_find(npath, &ref, NULL);
3443 kfree(npath);
3444 if (rc) {
3445 cifs_dbg(VFS, "%s: dfs_cache_noreq_find: failed (rc=%d)\n", __func__, rc);
3446 return rc;
3447 }
3448 cifs_dbg(FYI, "%s: ref.flags=0x%x\n", __func__, ref.flags);
3449 /*
3450 * Check if all targets are capable of handling DFS referrals as per
3451 * MS-DFSC 2.2.4 RESP_GET_DFS_REFERRAL.
3452 */
3453 *ref_server = !!(ref.flags & DFSREF_REFERRAL_SERVER);
3454 free_dfs_info_param(&ref);
3455 }
3456 return 0;
3457}
3458
3459int cifs_mount(struct cifs_sb_info *cifs_sb, struct smb3_fs_context *ctx)
3460{
3461 int rc = 0;
3462 unsigned int xid;
3463 struct TCP_Server_Info *server = NULL;
3464 struct cifs_ses *ses = NULL, *root_ses = NULL;
3465 struct cifs_tcon *tcon = NULL;
3466 int count = 0;
3467 uuid_t mount_id = {0};
3468 char *ref_path = NULL, *full_path = NULL;
3469 char *oldmnt = NULL;
3470 bool ref_server = false;
3471
3472 rc = mount_get_conns(ctx, cifs_sb, &xid, &server, &ses, &tcon);
3473 /*
3474 * If called with 'nodfs' mount option, then skip DFS resolving. Otherwise unconditionally
3475 * try to get an DFS referral (even cached) to determine whether it is an DFS mount.
3476 *
3477 * Skip prefix path to provide support for DFS referrals from w2k8 servers which don't seem
3478 * to respond with PATH_NOT_COVERED to requests that include the prefix.
3479 */
3480 if ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_DFS) ||
3481 dfs_cache_find(xid, ses, cifs_sb->local_nls, cifs_remap(cifs_sb), ctx->UNC + 1, NULL,
3482 NULL)) {
3483 if (rc)
3484 goto error;
3485 /* Check if it is fully accessible and then mount it */
3486 rc = is_path_remote(cifs_sb, ctx, xid, server, tcon);
3487 if (!rc)
3488 goto out;
3489 if (rc != -EREMOTE)
3490 goto error;
3491 }
3492
3493 mount_put_conns(cifs_sb, xid, server, ses, tcon);
3494 /*
3495 * Ignore error check here because we may failover to other targets from cached a
3496 * referral.
3497 */
3498 (void)mount_get_dfs_conns(ctx, cifs_sb, &xid, &server, &ses, &tcon);
3499
3500 /* Get path of DFS root */
3501 ref_path = build_unc_path_to_root(ctx, cifs_sb, false);
3502 if (IS_ERR(ref_path)) {
3503 rc = PTR_ERR(ref_path);
3504 ref_path = NULL;
3505 goto error;
3506 }
3507
3508 uuid_gen(&mount_id);
3509 set_root_ses(cifs_sb, &mount_id, ses, &root_ses);
3510 do {
3511 /* Save full path of last DFS path we used to resolve final target server */
3512 kfree(full_path);
3513 full_path = build_unc_path_to_root(ctx, cifs_sb, !!count);
3514 if (IS_ERR(full_path)) {
3515 rc = PTR_ERR(full_path);
3516 full_path = NULL;
3517 break;
3518 }
3519 /* Chase referral */
3520 oldmnt = cifs_sb->ctx->mount_options;
3521 rc = expand_dfs_referral(xid, root_ses, ctx, cifs_sb, ref_path + 1);
3522 if (rc)
3523 break;
3524 /* Connect to new DFS target only if we were redirected */
3525 if (oldmnt != cifs_sb->ctx->mount_options) {
3526 mount_put_conns(cifs_sb, xid, server, ses, tcon);
3527 rc = mount_get_dfs_conns(ctx, cifs_sb, &xid, &server, &ses, &tcon);
3528 }
3529 if (rc && !server && !ses) {
3530 /* Failed to connect. Try to connect to other targets in the referral. */
3531 rc = do_dfs_failover(ref_path + 1, full_path, cifs_sb, ctx, root_ses, &xid,
3532 &server, &ses, &tcon);
3533 }
3534 if (rc == -EACCES || rc == -EOPNOTSUPP || !server || !ses)
3535 break;
3536 if (!tcon)
3537 continue;
3538
3539 /* Make sure that requests go through new root servers */
3540 rc = is_referral_server(ref_path + 1, cifs_sb, tcon, &ref_server);
3541 if (rc)
3542 break;
3543 if (ref_server)
3544 set_root_ses(cifs_sb, &mount_id, ses, &root_ses);
3545
3546 /* Get next dfs path and then continue chasing them if -EREMOTE */
3547 rc = next_dfs_prepath(cifs_sb, ctx, xid, server, tcon, &ref_path);
3548 /* Prevent recursion on broken link referrals */
3549 if (rc == -EREMOTE && ++count > MAX_NESTED_LINKS)
3550 rc = -ELOOP;
3551 } while (rc == -EREMOTE);
3552
3553 if (rc || !tcon || !ses)
3554 goto error;
3555
3556 kfree(ref_path);
3557 /*
3558 * Store DFS full path in both superblock and tree connect structures.
3559 *
3560 * For DFS root mounts, the prefix path (cifs_sb->prepath) is preserved during reconnect so
3561 * only the root path is set in cifs_sb->origin_fullpath and tcon->dfs_path. And for DFS
3562 * links, the prefix path is included in both and may be changed during reconnect. See
3563 * cifs_tree_connect().
3564 */
3565 ref_path = dfs_cache_canonical_path(full_path, cifs_sb->local_nls, cifs_remap(cifs_sb));
3566 kfree(full_path);
3567 full_path = NULL;
3568
3569 if (IS_ERR(ref_path)) {
3570 rc = PTR_ERR(ref_path);
3571 ref_path = NULL;
3572 goto error;
3573 }
3574 cifs_sb->origin_fullpath = ref_path;
3575
3576 ref_path = kstrdup(cifs_sb->origin_fullpath, GFP_KERNEL);
3577 if (!ref_path) {
3578 rc = -ENOMEM;
3579 goto error;
3580 }
3581 spin_lock(&cifs_tcp_ses_lock);
3582 tcon->dfs_path = ref_path;
3583 ref_path = NULL;
3584 spin_unlock(&cifs_tcp_ses_lock);
3585
3586 /*
3587 * After reconnecting to a different server, unique ids won't
3588 * match anymore, so we disable serverino. This prevents
3589 * dentry revalidation to think the dentry are stale (ESTALE).
3590 */
3591 cifs_autodisable_serverino(cifs_sb);
3592 /*
3593 * Force the use of prefix path to support failover on DFS paths that
3594 * resolve to targets that have different prefix paths.
3595 */
3596 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_USE_PREFIX_PATH;
3597 kfree(cifs_sb->prepath);
3598 cifs_sb->prepath = ctx->prepath;
3599 ctx->prepath = NULL;
3600 uuid_copy(&cifs_sb->dfs_mount_id, &mount_id);
3601
3602out:
3603 free_xid(xid);
3604 cifs_try_adding_channels(cifs_sb, ses);
3605 return mount_setup_tlink(cifs_sb, ses, tcon);
3606
3607error:
3608 kfree(ref_path);
3609 kfree(full_path);
3610 kfree(cifs_sb->origin_fullpath);
3611 dfs_cache_put_refsrv_sessions(&mount_id);
3612 mount_put_conns(cifs_sb, xid, server, ses, tcon);
3613 return rc;
3614}
3615#else
3616int cifs_mount(struct cifs_sb_info *cifs_sb, struct smb3_fs_context *ctx)
3617{
3618 int rc = 0;
3619 unsigned int xid;
3620 struct cifs_ses *ses;
3621 struct cifs_tcon *tcon;
3622 struct TCP_Server_Info *server;
3623
3624 rc = mount_get_conns(ctx, cifs_sb, &xid, &server, &ses, &tcon);
3625 if (rc)
3626 goto error;
3627
3628 if (tcon) {
3629 rc = is_path_remote(cifs_sb, ctx, xid, server, tcon);
3630 if (rc == -EREMOTE)
3631 rc = -EOPNOTSUPP;
3632 if (rc)
3633 goto error;
3634 }
3635
3636 free_xid(xid);
3637
3638 return mount_setup_tlink(cifs_sb, ses, tcon);
3639
3640error:
3641 mount_put_conns(cifs_sb, xid, server, ses, tcon);
3642 return rc;
3643}
3644#endif
3645
3646/*
3647 * Issue a TREE_CONNECT request.
3648 */
3649int
3650CIFSTCon(const unsigned int xid, struct cifs_ses *ses,
3651 const char *tree, struct cifs_tcon *tcon,
3652 const struct nls_table *nls_codepage)
3653{
3654 struct smb_hdr *smb_buffer;
3655 struct smb_hdr *smb_buffer_response;
3656 TCONX_REQ *pSMB;
3657 TCONX_RSP *pSMBr;
3658 unsigned char *bcc_ptr;
3659 int rc = 0;
3660 int length;
3661 __u16 bytes_left, count;
3662
3663 if (ses == NULL)
3664 return -EIO;
3665
3666 smb_buffer = cifs_buf_get();
3667 if (smb_buffer == NULL)
3668 return -ENOMEM;
3669
3670 smb_buffer_response = smb_buffer;
3671
3672 header_assemble(smb_buffer, SMB_COM_TREE_CONNECT_ANDX,
3673 NULL /*no tid */ , 4 /*wct */ );
3674
3675 smb_buffer->Mid = get_next_mid(ses->server);
3676 smb_buffer->Uid = ses->Suid;
3677 pSMB = (TCONX_REQ *) smb_buffer;
3678 pSMBr = (TCONX_RSP *) smb_buffer_response;
3679
3680 pSMB->AndXCommand = 0xFF;
3681 pSMB->Flags = cpu_to_le16(TCON_EXTENDED_SECINFO);
3682 bcc_ptr = &pSMB->Password[0];
3683 if (tcon->pipe || (ses->server->sec_mode & SECMODE_USER)) {
3684 pSMB->PasswordLength = cpu_to_le16(1); /* minimum */
3685 *bcc_ptr = 0; /* password is null byte */
3686 bcc_ptr++; /* skip password */
3687 /* already aligned so no need to do it below */
3688 } else {
3689 pSMB->PasswordLength = cpu_to_le16(CIFS_AUTH_RESP_SIZE);
3690 /* BB FIXME add code to fail this if NTLMv2 or Kerberos
3691 specified as required (when that support is added to
3692 the vfs in the future) as only NTLM or the much
3693 weaker LANMAN (which we do not send by default) is accepted
3694 by Samba (not sure whether other servers allow
3695 NTLMv2 password here) */
3696#ifdef CONFIG_CIFS_WEAK_PW_HASH
3697 if ((global_secflags & CIFSSEC_MAY_LANMAN) &&
3698 (ses->sectype == LANMAN))
3699 calc_lanman_hash(tcon->password, ses->server->cryptkey,
3700 ses->server->sec_mode &
3701 SECMODE_PW_ENCRYPT ? true : false,
3702 bcc_ptr);
3703 else
3704#endif /* CIFS_WEAK_PW_HASH */
3705 rc = SMBNTencrypt(tcon->password, ses->server->cryptkey,
3706 bcc_ptr, nls_codepage);
3707 if (rc) {
3708 cifs_dbg(FYI, "%s Can't generate NTLM rsp. Error: %d\n",
3709 __func__, rc);
3710 cifs_buf_release(smb_buffer);
3711 return rc;
3712 }
3713
3714 bcc_ptr += CIFS_AUTH_RESP_SIZE;
3715 if (ses->capabilities & CAP_UNICODE) {
3716 /* must align unicode strings */
3717 *bcc_ptr = 0; /* null byte password */
3718 bcc_ptr++;
3719 }
3720 }
3721
3722 if (ses->server->sign)
3723 smb_buffer->Flags2 |= SMBFLG2_SECURITY_SIGNATURE;
3724
3725 if (ses->capabilities & CAP_STATUS32) {
3726 smb_buffer->Flags2 |= SMBFLG2_ERR_STATUS;
3727 }
3728 if (ses->capabilities & CAP_DFS) {
3729 smb_buffer->Flags2 |= SMBFLG2_DFS;
3730 }
3731 if (ses->capabilities & CAP_UNICODE) {
3732 smb_buffer->Flags2 |= SMBFLG2_UNICODE;
3733 length =
3734 cifs_strtoUTF16((__le16 *) bcc_ptr, tree,
3735 6 /* max utf8 char length in bytes */ *
3736 (/* server len*/ + 256 /* share len */), nls_codepage);
3737 bcc_ptr += 2 * length; /* convert num 16 bit words to bytes */
3738 bcc_ptr += 2; /* skip trailing null */
3739 } else { /* ASCII */
3740 strcpy(bcc_ptr, tree);
3741 bcc_ptr += strlen(tree) + 1;
3742 }
3743 strcpy(bcc_ptr, "?????");
3744 bcc_ptr += strlen("?????");
3745 bcc_ptr += 1;
3746 count = bcc_ptr - &pSMB->Password[0];
3747 be32_add_cpu(&pSMB->hdr.smb_buf_length, count);
3748 pSMB->ByteCount = cpu_to_le16(count);
3749
3750 rc = SendReceive(xid, ses, smb_buffer, smb_buffer_response, &length,
3751 0);
3752
3753 /* above now done in SendReceive */
3754 if (rc == 0) {
3755 bool is_unicode;
3756
3757 tcon->tidStatus = CifsGood;
3758 tcon->need_reconnect = false;
3759 tcon->tid = smb_buffer_response->Tid;
3760 bcc_ptr = pByteArea(smb_buffer_response);
3761 bytes_left = get_bcc(smb_buffer_response);
3762 length = strnlen(bcc_ptr, bytes_left - 2);
3763 if (smb_buffer->Flags2 & SMBFLG2_UNICODE)
3764 is_unicode = true;
3765 else
3766 is_unicode = false;
3767
3768
3769 /* skip service field (NB: this field is always ASCII) */
3770 if (length == 3) {
3771 if ((bcc_ptr[0] == 'I') && (bcc_ptr[1] == 'P') &&
3772 (bcc_ptr[2] == 'C')) {
3773 cifs_dbg(FYI, "IPC connection\n");
3774 tcon->ipc = true;
3775 tcon->pipe = true;
3776 }
3777 } else if (length == 2) {
3778 if ((bcc_ptr[0] == 'A') && (bcc_ptr[1] == ':')) {
3779 /* the most common case */
3780 cifs_dbg(FYI, "disk share connection\n");
3781 }
3782 }
3783 bcc_ptr += length + 1;
3784 bytes_left -= (length + 1);
3785 strlcpy(tcon->treeName, tree, sizeof(tcon->treeName));
3786
3787 /* mostly informational -- no need to fail on error here */
3788 kfree(tcon->nativeFileSystem);
3789 tcon->nativeFileSystem = cifs_strndup_from_utf16(bcc_ptr,
3790 bytes_left, is_unicode,
3791 nls_codepage);
3792
3793 cifs_dbg(FYI, "nativeFileSystem=%s\n", tcon->nativeFileSystem);
3794
3795 if ((smb_buffer_response->WordCount == 3) ||
3796 (smb_buffer_response->WordCount == 7))
3797 /* field is in same location */
3798 tcon->Flags = le16_to_cpu(pSMBr->OptionalSupport);
3799 else
3800 tcon->Flags = 0;
3801 cifs_dbg(FYI, "Tcon flags: 0x%x\n", tcon->Flags);
3802 }
3803
3804 cifs_buf_release(smb_buffer);
3805 return rc;
3806}
3807
3808static void delayed_free(struct rcu_head *p)
3809{
3810 struct cifs_sb_info *cifs_sb = container_of(p, struct cifs_sb_info, rcu);
3811
3812 unload_nls(cifs_sb->local_nls);
3813 smb3_cleanup_fs_context(cifs_sb->ctx);
3814 kfree(cifs_sb);
3815}
3816
3817void
3818cifs_umount(struct cifs_sb_info *cifs_sb)
3819{
3820 struct rb_root *root = &cifs_sb->tlink_tree;
3821 struct rb_node *node;
3822 struct tcon_link *tlink;
3823
3824 cancel_delayed_work_sync(&cifs_sb->prune_tlinks);
3825
3826 spin_lock(&cifs_sb->tlink_tree_lock);
3827 while ((node = rb_first(root))) {
3828 tlink = rb_entry(node, struct tcon_link, tl_rbnode);
3829 cifs_get_tlink(tlink);
3830 clear_bit(TCON_LINK_IN_TREE, &tlink->tl_flags);
3831 rb_erase(node, root);
3832
3833 spin_unlock(&cifs_sb->tlink_tree_lock);
3834 cifs_put_tlink(tlink);
3835 spin_lock(&cifs_sb->tlink_tree_lock);
3836 }
3837 spin_unlock(&cifs_sb->tlink_tree_lock);
3838
3839 kfree(cifs_sb->prepath);
3840#ifdef CONFIG_CIFS_DFS_UPCALL
3841 dfs_cache_put_refsrv_sessions(&cifs_sb->dfs_mount_id);
3842 kfree(cifs_sb->origin_fullpath);
3843#endif
3844 call_rcu(&cifs_sb->rcu, delayed_free);
3845}
3846
3847int
3848cifs_negotiate_protocol(const unsigned int xid, struct cifs_ses *ses)
3849{
3850 int rc = 0;
3851 struct TCP_Server_Info *server = cifs_ses_server(ses);
3852
3853 if (!server->ops->need_neg || !server->ops->negotiate)
3854 return -ENOSYS;
3855
3856 /* only send once per connect */
3857 if (!server->ops->need_neg(server))
3858 return 0;
3859
3860 rc = server->ops->negotiate(xid, ses);
3861 if (rc == 0) {
3862 spin_lock(&GlobalMid_Lock);
3863 if (server->tcpStatus == CifsNeedNegotiate)
3864 server->tcpStatus = CifsGood;
3865 else
3866 rc = -EHOSTDOWN;
3867 spin_unlock(&GlobalMid_Lock);
3868 }
3869
3870 return rc;
3871}
3872
3873int
3874cifs_setup_session(const unsigned int xid, struct cifs_ses *ses,
3875 struct nls_table *nls_info)
3876{
3877 int rc = -ENOSYS;
3878 struct TCP_Server_Info *server = cifs_ses_server(ses);
3879
3880 if (!ses->binding) {
3881 ses->capabilities = server->capabilities;
3882 if (!linuxExtEnabled)
3883 ses->capabilities &= (~server->vals->cap_unix);
3884
3885 if (ses->auth_key.response) {
3886 cifs_dbg(FYI, "Free previous auth_key.response = %p\n",
3887 ses->auth_key.response);
3888 kfree(ses->auth_key.response);
3889 ses->auth_key.response = NULL;
3890 ses->auth_key.len = 0;
3891 }
3892 }
3893
3894 cifs_dbg(FYI, "Security Mode: 0x%x Capabilities: 0x%x TimeAdjust: %d\n",
3895 server->sec_mode, server->capabilities, server->timeAdj);
3896
3897 if (server->ops->sess_setup)
3898 rc = server->ops->sess_setup(xid, ses, nls_info);
3899
3900 if (rc)
3901 cifs_server_dbg(VFS, "Send error in SessSetup = %d\n", rc);
3902
3903 return rc;
3904}
3905
3906static int
3907cifs_set_vol_auth(struct smb3_fs_context *ctx, struct cifs_ses *ses)
3908{
3909 ctx->sectype = ses->sectype;
3910
3911 /* krb5 is special, since we don't need username or pw */
3912 if (ctx->sectype == Kerberos)
3913 return 0;
3914
3915 return cifs_set_cifscreds(ctx, ses);
3916}
3917
3918static struct cifs_tcon *
3919cifs_construct_tcon(struct cifs_sb_info *cifs_sb, kuid_t fsuid)
3920{
3921 int rc;
3922 struct cifs_tcon *master_tcon = cifs_sb_master_tcon(cifs_sb);
3923 struct cifs_ses *ses;
3924 struct cifs_tcon *tcon = NULL;
3925 struct smb3_fs_context *ctx;
3926
3927 ctx = kzalloc(sizeof(*ctx), GFP_KERNEL);
3928 if (ctx == NULL)
3929 return ERR_PTR(-ENOMEM);
3930
3931 ctx->local_nls = cifs_sb->local_nls;
3932 ctx->linux_uid = fsuid;
3933 ctx->cred_uid = fsuid;
3934 ctx->UNC = master_tcon->treeName;
3935 ctx->retry = master_tcon->retry;
3936 ctx->nocase = master_tcon->nocase;
3937 ctx->nohandlecache = master_tcon->nohandlecache;
3938 ctx->local_lease = master_tcon->local_lease;
3939 ctx->no_lease = master_tcon->no_lease;
3940 ctx->resilient = master_tcon->use_resilient;
3941 ctx->persistent = master_tcon->use_persistent;
3942 ctx->handle_timeout = master_tcon->handle_timeout;
3943 ctx->no_linux_ext = !master_tcon->unix_ext;
3944 ctx->linux_ext = master_tcon->posix_extensions;
3945 ctx->sectype = master_tcon->ses->sectype;
3946 ctx->sign = master_tcon->ses->sign;
3947 ctx->seal = master_tcon->seal;
3948 ctx->witness = master_tcon->use_witness;
3949
3950 rc = cifs_set_vol_auth(ctx, master_tcon->ses);
3951 if (rc) {
3952 tcon = ERR_PTR(rc);
3953 goto out;
3954 }
3955
3956 /* get a reference for the same TCP session */
3957 spin_lock(&cifs_tcp_ses_lock);
3958 ++master_tcon->ses->server->srv_count;
3959 spin_unlock(&cifs_tcp_ses_lock);
3960
3961 ses = cifs_get_smb_ses(master_tcon->ses->server, ctx);
3962 if (IS_ERR(ses)) {
3963 tcon = (struct cifs_tcon *)ses;
3964 cifs_put_tcp_session(master_tcon->ses->server, 0);
3965 goto out;
3966 }
3967
3968 tcon = cifs_get_tcon(ses, ctx);
3969 if (IS_ERR(tcon)) {
3970 cifs_put_smb_ses(ses);
3971 goto out;
3972 }
3973
3974 if (cap_unix(ses))
3975 reset_cifs_unix_caps(0, tcon, NULL, ctx);
3976
3977out:
3978 kfree(ctx->username);
3979 kfree_sensitive(ctx->password);
3980 kfree(ctx);
3981
3982 return tcon;
3983}
3984
3985struct cifs_tcon *
3986cifs_sb_master_tcon(struct cifs_sb_info *cifs_sb)
3987{
3988 return tlink_tcon(cifs_sb_master_tlink(cifs_sb));
3989}
3990
3991/* find and return a tlink with given uid */
3992static struct tcon_link *
3993tlink_rb_search(struct rb_root *root, kuid_t uid)
3994{
3995 struct rb_node *node = root->rb_node;
3996 struct tcon_link *tlink;
3997
3998 while (node) {
3999 tlink = rb_entry(node, struct tcon_link, tl_rbnode);
4000
4001 if (uid_gt(tlink->tl_uid, uid))
4002 node = node->rb_left;
4003 else if (uid_lt(tlink->tl_uid, uid))
4004 node = node->rb_right;
4005 else
4006 return tlink;
4007 }
4008 return NULL;
4009}
4010
4011/* insert a tcon_link into the tree */
4012static void
4013tlink_rb_insert(struct rb_root *root, struct tcon_link *new_tlink)
4014{
4015 struct rb_node **new = &(root->rb_node), *parent = NULL;
4016 struct tcon_link *tlink;
4017
4018 while (*new) {
4019 tlink = rb_entry(*new, struct tcon_link, tl_rbnode);
4020 parent = *new;
4021
4022 if (uid_gt(tlink->tl_uid, new_tlink->tl_uid))
4023 new = &((*new)->rb_left);
4024 else
4025 new = &((*new)->rb_right);
4026 }
4027
4028 rb_link_node(&new_tlink->tl_rbnode, parent, new);
4029 rb_insert_color(&new_tlink->tl_rbnode, root);
4030}
4031
4032/*
4033 * Find or construct an appropriate tcon given a cifs_sb and the fsuid of the
4034 * current task.
4035 *
4036 * If the superblock doesn't refer to a multiuser mount, then just return
4037 * the master tcon for the mount.
4038 *
4039 * First, search the rbtree for an existing tcon for this fsuid. If one
4040 * exists, then check to see if it's pending construction. If it is then wait
4041 * for construction to complete. Once it's no longer pending, check to see if
4042 * it failed and either return an error or retry construction, depending on
4043 * the timeout.
4044 *
4045 * If one doesn't exist then insert a new tcon_link struct into the tree and
4046 * try to construct a new one.
4047 */
4048struct tcon_link *
4049cifs_sb_tlink(struct cifs_sb_info *cifs_sb)
4050{
4051 int ret;
4052 kuid_t fsuid = current_fsuid();
4053 struct tcon_link *tlink, *newtlink;
4054
4055 if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MULTIUSER))
4056 return cifs_get_tlink(cifs_sb_master_tlink(cifs_sb));
4057
4058 spin_lock(&cifs_sb->tlink_tree_lock);
4059 tlink = tlink_rb_search(&cifs_sb->tlink_tree, fsuid);
4060 if (tlink)
4061 cifs_get_tlink(tlink);
4062 spin_unlock(&cifs_sb->tlink_tree_lock);
4063
4064 if (tlink == NULL) {
4065 newtlink = kzalloc(sizeof(*tlink), GFP_KERNEL);
4066 if (newtlink == NULL)
4067 return ERR_PTR(-ENOMEM);
4068 newtlink->tl_uid = fsuid;
4069 newtlink->tl_tcon = ERR_PTR(-EACCES);
4070 set_bit(TCON_LINK_PENDING, &newtlink->tl_flags);
4071 set_bit(TCON_LINK_IN_TREE, &newtlink->tl_flags);
4072 cifs_get_tlink(newtlink);
4073
4074 spin_lock(&cifs_sb->tlink_tree_lock);
4075 /* was one inserted after previous search? */
4076 tlink = tlink_rb_search(&cifs_sb->tlink_tree, fsuid);
4077 if (tlink) {
4078 cifs_get_tlink(tlink);
4079 spin_unlock(&cifs_sb->tlink_tree_lock);
4080 kfree(newtlink);
4081 goto wait_for_construction;
4082 }
4083 tlink = newtlink;
4084 tlink_rb_insert(&cifs_sb->tlink_tree, tlink);
4085 spin_unlock(&cifs_sb->tlink_tree_lock);
4086 } else {
4087wait_for_construction:
4088 ret = wait_on_bit(&tlink->tl_flags, TCON_LINK_PENDING,
4089 TASK_INTERRUPTIBLE);
4090 if (ret) {
4091 cifs_put_tlink(tlink);
4092 return ERR_PTR(-ERESTARTSYS);
4093 }
4094
4095 /* if it's good, return it */
4096 if (!IS_ERR(tlink->tl_tcon))
4097 return tlink;
4098
4099 /* return error if we tried this already recently */
4100 if (time_before(jiffies, tlink->tl_time + TLINK_ERROR_EXPIRE)) {
4101 cifs_put_tlink(tlink);
4102 return ERR_PTR(-EACCES);
4103 }
4104
4105 if (test_and_set_bit(TCON_LINK_PENDING, &tlink->tl_flags))
4106 goto wait_for_construction;
4107 }
4108
4109 tlink->tl_tcon = cifs_construct_tcon(cifs_sb, fsuid);
4110 clear_bit(TCON_LINK_PENDING, &tlink->tl_flags);
4111 wake_up_bit(&tlink->tl_flags, TCON_LINK_PENDING);
4112
4113 if (IS_ERR(tlink->tl_tcon)) {
4114 cifs_put_tlink(tlink);
4115 return ERR_PTR(-EACCES);
4116 }
4117
4118 return tlink;
4119}
4120
4121/*
4122 * periodic workqueue job that scans tcon_tree for a superblock and closes
4123 * out tcons.
4124 */
4125static void
4126cifs_prune_tlinks(struct work_struct *work)
4127{
4128 struct cifs_sb_info *cifs_sb = container_of(work, struct cifs_sb_info,
4129 prune_tlinks.work);
4130 struct rb_root *root = &cifs_sb->tlink_tree;
4131 struct rb_node *node;
4132 struct rb_node *tmp;
4133 struct tcon_link *tlink;
4134
4135 /*
4136 * Because we drop the spinlock in the loop in order to put the tlink
4137 * it's not guarded against removal of links from the tree. The only
4138 * places that remove entries from the tree are this function and
4139 * umounts. Because this function is non-reentrant and is canceled
4140 * before umount can proceed, this is safe.
4141 */
4142 spin_lock(&cifs_sb->tlink_tree_lock);
4143 node = rb_first(root);
4144 while (node != NULL) {
4145 tmp = node;
4146 node = rb_next(tmp);
4147 tlink = rb_entry(tmp, struct tcon_link, tl_rbnode);
4148
4149 if (test_bit(TCON_LINK_MASTER, &tlink->tl_flags) ||
4150 atomic_read(&tlink->tl_count) != 0 ||
4151 time_after(tlink->tl_time + TLINK_IDLE_EXPIRE, jiffies))
4152 continue;
4153
4154 cifs_get_tlink(tlink);
4155 clear_bit(TCON_LINK_IN_TREE, &tlink->tl_flags);
4156 rb_erase(tmp, root);
4157
4158 spin_unlock(&cifs_sb->tlink_tree_lock);
4159 cifs_put_tlink(tlink);
4160 spin_lock(&cifs_sb->tlink_tree_lock);
4161 }
4162 spin_unlock(&cifs_sb->tlink_tree_lock);
4163
4164 queue_delayed_work(cifsiod_wq, &cifs_sb->prune_tlinks,
4165 TLINK_IDLE_EXPIRE);
4166}
4167
4168#ifdef CONFIG_CIFS_DFS_UPCALL
4169int cifs_tree_connect(const unsigned int xid, struct cifs_tcon *tcon, const struct nls_table *nlsc)
4170{
4171 int rc;
4172 struct TCP_Server_Info *server = tcon->ses->server;
4173 const struct smb_version_operations *ops = server->ops;
4174 struct dfs_cache_tgt_list tl;
4175 struct dfs_cache_tgt_iterator *it = NULL;
4176 char *tree;
4177 const char *tcp_host;
4178 size_t tcp_host_len;
4179 const char *dfs_host;
4180 size_t dfs_host_len;
4181 char *share = NULL, *prefix = NULL;
4182 struct dfs_info3_param ref = {0};
4183 bool isroot;
4184
4185 tree = kzalloc(MAX_TREE_SIZE, GFP_KERNEL);
4186 if (!tree)
4187 return -ENOMEM;
4188
4189 /* If it is not dfs or there was no cached dfs referral, then reconnect to same share */
4190 if (!tcon->dfs_path || dfs_cache_noreq_find(tcon->dfs_path + 1, &ref, &tl)) {
4191 if (tcon->ipc) {
4192 scnprintf(tree, MAX_TREE_SIZE, "\\\\%s\\IPC$", server->hostname);
4193 rc = ops->tree_connect(xid, tcon->ses, tree, tcon, nlsc);
4194 } else {
4195 rc = ops->tree_connect(xid, tcon->ses, tcon->treeName, tcon, nlsc);
4196 }
4197 goto out;
4198 }
4199
4200 isroot = ref.server_type == DFS_TYPE_ROOT;
4201 free_dfs_info_param(&ref);
4202
4203 extract_unc_hostname(server->hostname, &tcp_host, &tcp_host_len);
4204
4205 for (it = dfs_cache_get_tgt_iterator(&tl); it; it = dfs_cache_get_next_tgt(&tl, it)) {
4206 bool target_match;
4207
4208 kfree(share);
4209 kfree(prefix);
4210 share = NULL;
4211 prefix = NULL;
4212
4213 rc = dfs_cache_get_tgt_share(tcon->dfs_path + 1, it, &share, &prefix);
4214 if (rc) {
4215 cifs_dbg(VFS, "%s: failed to parse target share %d\n",
4216 __func__, rc);
4217 continue;
4218 }
4219
4220 extract_unc_hostname(share, &dfs_host, &dfs_host_len);
4221
4222 if (dfs_host_len != tcp_host_len
4223 || strncasecmp(dfs_host, tcp_host, dfs_host_len) != 0) {
4224 cifs_dbg(FYI, "%s: %.*s doesn't match %.*s\n", __func__, (int)dfs_host_len,
4225 dfs_host, (int)tcp_host_len, tcp_host);
4226
4227 rc = match_target_ip(server, dfs_host, dfs_host_len, &target_match);
4228 if (rc) {
4229 cifs_dbg(VFS, "%s: failed to match target ip: %d\n", __func__, rc);
4230 break;
4231 }
4232
4233 if (!target_match) {
4234 cifs_dbg(FYI, "%s: skipping target\n", __func__);
4235 continue;
4236 }
4237 }
4238
4239 if (tcon->ipc) {
4240 scnprintf(tree, MAX_TREE_SIZE, "\\\\%s\\IPC$", share);
4241 rc = ops->tree_connect(xid, tcon->ses, tree, tcon, nlsc);
4242 } else {
4243 scnprintf(tree, MAX_TREE_SIZE, "\\%s", share);
4244 rc = ops->tree_connect(xid, tcon->ses, tree, tcon, nlsc);
4245 /* Only handle prefix paths of DFS link targets */
4246 if (!rc && !isroot) {
4247 rc = update_super_prepath(tcon, prefix);
4248 break;
4249 }
4250 }
4251 if (rc == -EREMOTE)
4252 break;
4253 }
4254
4255 kfree(share);
4256 kfree(prefix);
4257
4258 if (!rc) {
4259 if (it)
4260 rc = dfs_cache_noreq_update_tgthint(tcon->dfs_path + 1, it);
4261 else
4262 rc = -ENOENT;
4263 }
4264 dfs_cache_free_tgts(&tl);
4265out:
4266 kfree(tree);
4267 return rc;
4268}
4269#else
4270int cifs_tree_connect(const unsigned int xid, struct cifs_tcon *tcon, const struct nls_table *nlsc)
4271{
4272 const struct smb_version_operations *ops = tcon->ses->server->ops;
4273
4274 return ops->tree_connect(xid, tcon->ses, tcon->treeName, tcon, nlsc);
4275}
4276#endif