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1/*
2 * SMB1 (CIFS) version specific operations
3 *
4 * Copyright (c) 2012, Jeff Layton <jlayton@redhat.com>
5 *
6 * This library is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License v2 as published
8 * by the Free Software Foundation.
9 *
10 * This library is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See
13 * the GNU Lesser General Public License for more details.
14 *
15 * You should have received a copy of the GNU Lesser General Public License
16 * along with this library; if not, write to the Free Software
17 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
18 */
19
20#include <linux/pagemap.h>
21#include <linux/vfs.h>
22#include "cifsglob.h"
23#include "cifsproto.h"
24#include "cifs_debug.h"
25#include "cifspdu.h"
26#include "cifs_unicode.h"
27
28/*
29 * An NT cancel request header looks just like the original request except:
30 *
31 * The Command is SMB_COM_NT_CANCEL
32 * The WordCount is zeroed out
33 * The ByteCount is zeroed out
34 *
35 * This function mangles an existing request buffer into a
36 * SMB_COM_NT_CANCEL request and then sends it.
37 */
38static int
39send_nt_cancel(struct TCP_Server_Info *server, void *buf,
40 struct mid_q_entry *mid)
41{
42 int rc = 0;
43 struct smb_hdr *in_buf = (struct smb_hdr *)buf;
44
45 /* -4 for RFC1001 length and +2 for BCC field */
46 in_buf->smb_buf_length = cpu_to_be32(sizeof(struct smb_hdr) - 4 + 2);
47 in_buf->Command = SMB_COM_NT_CANCEL;
48 in_buf->WordCount = 0;
49 put_bcc(0, in_buf);
50
51 mutex_lock(&server->srv_mutex);
52 rc = cifs_sign_smb(in_buf, server, &mid->sequence_number);
53 if (rc) {
54 mutex_unlock(&server->srv_mutex);
55 return rc;
56 }
57
58 /*
59 * The response to this call was already factored into the sequence
60 * number when the call went out, so we must adjust it back downward
61 * after signing here.
62 */
63 --server->sequence_number;
64 rc = smb_send(server, in_buf, be32_to_cpu(in_buf->smb_buf_length));
65 if (rc < 0)
66 server->sequence_number--;
67
68 mutex_unlock(&server->srv_mutex);
69
70 cifs_dbg(FYI, "issued NT_CANCEL for mid %u, rc = %d\n",
71 get_mid(in_buf), rc);
72
73 return rc;
74}
75
76static bool
77cifs_compare_fids(struct cifsFileInfo *ob1, struct cifsFileInfo *ob2)
78{
79 return ob1->fid.netfid == ob2->fid.netfid;
80}
81
82static unsigned int
83cifs_read_data_offset(char *buf)
84{
85 READ_RSP *rsp = (READ_RSP *)buf;
86 return le16_to_cpu(rsp->DataOffset);
87}
88
89static unsigned int
90cifs_read_data_length(char *buf)
91{
92 READ_RSP *rsp = (READ_RSP *)buf;
93 return (le16_to_cpu(rsp->DataLengthHigh) << 16) +
94 le16_to_cpu(rsp->DataLength);
95}
96
97static struct mid_q_entry *
98cifs_find_mid(struct TCP_Server_Info *server, char *buffer)
99{
100 struct smb_hdr *buf = (struct smb_hdr *)buffer;
101 struct mid_q_entry *mid;
102
103 spin_lock(&GlobalMid_Lock);
104 list_for_each_entry(mid, &server->pending_mid_q, qhead) {
105 if (compare_mid(mid->mid, buf) &&
106 mid->mid_state == MID_REQUEST_SUBMITTED &&
107 le16_to_cpu(mid->command) == buf->Command) {
108 spin_unlock(&GlobalMid_Lock);
109 return mid;
110 }
111 }
112 spin_unlock(&GlobalMid_Lock);
113 return NULL;
114}
115
116static void
117cifs_add_credits(struct TCP_Server_Info *server, const unsigned int add,
118 const int optype)
119{
120 spin_lock(&server->req_lock);
121 server->credits += add;
122 server->in_flight--;
123 spin_unlock(&server->req_lock);
124 wake_up(&server->request_q);
125}
126
127static void
128cifs_set_credits(struct TCP_Server_Info *server, const int val)
129{
130 spin_lock(&server->req_lock);
131 server->credits = val;
132 server->oplocks = val > 1 ? enable_oplocks : false;
133 spin_unlock(&server->req_lock);
134}
135
136static int *
137cifs_get_credits_field(struct TCP_Server_Info *server, const int optype)
138{
139 return &server->credits;
140}
141
142static unsigned int
143cifs_get_credits(struct mid_q_entry *mid)
144{
145 return 1;
146}
147
148/*
149 * Find a free multiplex id (SMB mid). Otherwise there could be
150 * mid collisions which might cause problems, demultiplexing the
151 * wrong response to this request. Multiplex ids could collide if
152 * one of a series requests takes much longer than the others, or
153 * if a very large number of long lived requests (byte range
154 * locks or FindNotify requests) are pending. No more than
155 * 64K-1 requests can be outstanding at one time. If no
156 * mids are available, return zero. A future optimization
157 * could make the combination of mids and uid the key we use
158 * to demultiplex on (rather than mid alone).
159 * In addition to the above check, the cifs demultiplex
160 * code already used the command code as a secondary
161 * check of the frame and if signing is negotiated the
162 * response would be discarded if the mid were the same
163 * but the signature was wrong. Since the mid is not put in the
164 * pending queue until later (when it is about to be dispatched)
165 * we do have to limit the number of outstanding requests
166 * to somewhat less than 64K-1 although it is hard to imagine
167 * so many threads being in the vfs at one time.
168 */
169static __u64
170cifs_get_next_mid(struct TCP_Server_Info *server)
171{
172 __u64 mid = 0;
173 __u16 last_mid, cur_mid;
174 bool collision;
175
176 spin_lock(&GlobalMid_Lock);
177
178 /* mid is 16 bit only for CIFS/SMB */
179 cur_mid = (__u16)((server->CurrentMid) & 0xffff);
180 /* we do not want to loop forever */
181 last_mid = cur_mid;
182 cur_mid++;
183
184 /*
185 * This nested loop looks more expensive than it is.
186 * In practice the list of pending requests is short,
187 * fewer than 50, and the mids are likely to be unique
188 * on the first pass through the loop unless some request
189 * takes longer than the 64 thousand requests before it
190 * (and it would also have to have been a request that
191 * did not time out).
192 */
193 while (cur_mid != last_mid) {
194 struct mid_q_entry *mid_entry;
195 unsigned int num_mids;
196
197 collision = false;
198 if (cur_mid == 0)
199 cur_mid++;
200
201 num_mids = 0;
202 list_for_each_entry(mid_entry, &server->pending_mid_q, qhead) {
203 ++num_mids;
204 if (mid_entry->mid == cur_mid &&
205 mid_entry->mid_state == MID_REQUEST_SUBMITTED) {
206 /* This mid is in use, try a different one */
207 collision = true;
208 break;
209 }
210 }
211
212 /*
213 * if we have more than 32k mids in the list, then something
214 * is very wrong. Possibly a local user is trying to DoS the
215 * box by issuing long-running calls and SIGKILL'ing them. If
216 * we get to 2^16 mids then we're in big trouble as this
217 * function could loop forever.
218 *
219 * Go ahead and assign out the mid in this situation, but force
220 * an eventual reconnect to clean out the pending_mid_q.
221 */
222 if (num_mids > 32768)
223 server->tcpStatus = CifsNeedReconnect;
224
225 if (!collision) {
226 mid = (__u64)cur_mid;
227 server->CurrentMid = mid;
228 break;
229 }
230 cur_mid++;
231 }
232 spin_unlock(&GlobalMid_Lock);
233 return mid;
234}
235
236/*
237 return codes:
238 0 not a transact2, or all data present
239 >0 transact2 with that much data missing
240 -EINVAL invalid transact2
241 */
242static int
243check2ndT2(char *buf)
244{
245 struct smb_hdr *pSMB = (struct smb_hdr *)buf;
246 struct smb_t2_rsp *pSMBt;
247 int remaining;
248 __u16 total_data_size, data_in_this_rsp;
249
250 if (pSMB->Command != SMB_COM_TRANSACTION2)
251 return 0;
252
253 /* check for plausible wct, bcc and t2 data and parm sizes */
254 /* check for parm and data offset going beyond end of smb */
255 if (pSMB->WordCount != 10) { /* coalesce_t2 depends on this */
256 cifs_dbg(FYI, "invalid transact2 word count\n");
257 return -EINVAL;
258 }
259
260 pSMBt = (struct smb_t2_rsp *)pSMB;
261
262 total_data_size = get_unaligned_le16(&pSMBt->t2_rsp.TotalDataCount);
263 data_in_this_rsp = get_unaligned_le16(&pSMBt->t2_rsp.DataCount);
264
265 if (total_data_size == data_in_this_rsp)
266 return 0;
267 else if (total_data_size < data_in_this_rsp) {
268 cifs_dbg(FYI, "total data %d smaller than data in frame %d\n",
269 total_data_size, data_in_this_rsp);
270 return -EINVAL;
271 }
272
273 remaining = total_data_size - data_in_this_rsp;
274
275 cifs_dbg(FYI, "missing %d bytes from transact2, check next response\n",
276 remaining);
277 if (total_data_size > CIFSMaxBufSize) {
278 cifs_dbg(VFS, "TotalDataSize %d is over maximum buffer %d\n",
279 total_data_size, CIFSMaxBufSize);
280 return -EINVAL;
281 }
282 return remaining;
283}
284
285static int
286coalesce_t2(char *second_buf, struct smb_hdr *target_hdr)
287{
288 struct smb_t2_rsp *pSMBs = (struct smb_t2_rsp *)second_buf;
289 struct smb_t2_rsp *pSMBt = (struct smb_t2_rsp *)target_hdr;
290 char *data_area_of_tgt;
291 char *data_area_of_src;
292 int remaining;
293 unsigned int byte_count, total_in_tgt;
294 __u16 tgt_total_cnt, src_total_cnt, total_in_src;
295
296 src_total_cnt = get_unaligned_le16(&pSMBs->t2_rsp.TotalDataCount);
297 tgt_total_cnt = get_unaligned_le16(&pSMBt->t2_rsp.TotalDataCount);
298
299 if (tgt_total_cnt != src_total_cnt)
300 cifs_dbg(FYI, "total data count of primary and secondary t2 differ source=%hu target=%hu\n",
301 src_total_cnt, tgt_total_cnt);
302
303 total_in_tgt = get_unaligned_le16(&pSMBt->t2_rsp.DataCount);
304
305 remaining = tgt_total_cnt - total_in_tgt;
306
307 if (remaining < 0) {
308 cifs_dbg(FYI, "Server sent too much data. tgt_total_cnt=%hu total_in_tgt=%hu\n",
309 tgt_total_cnt, total_in_tgt);
310 return -EPROTO;
311 }
312
313 if (remaining == 0) {
314 /* nothing to do, ignore */
315 cifs_dbg(FYI, "no more data remains\n");
316 return 0;
317 }
318
319 total_in_src = get_unaligned_le16(&pSMBs->t2_rsp.DataCount);
320 if (remaining < total_in_src)
321 cifs_dbg(FYI, "transact2 2nd response contains too much data\n");
322
323 /* find end of first SMB data area */
324 data_area_of_tgt = (char *)&pSMBt->hdr.Protocol +
325 get_unaligned_le16(&pSMBt->t2_rsp.DataOffset);
326
327 /* validate target area */
328 data_area_of_src = (char *)&pSMBs->hdr.Protocol +
329 get_unaligned_le16(&pSMBs->t2_rsp.DataOffset);
330
331 data_area_of_tgt += total_in_tgt;
332
333 total_in_tgt += total_in_src;
334 /* is the result too big for the field? */
335 if (total_in_tgt > USHRT_MAX) {
336 cifs_dbg(FYI, "coalesced DataCount too large (%u)\n",
337 total_in_tgt);
338 return -EPROTO;
339 }
340 put_unaligned_le16(total_in_tgt, &pSMBt->t2_rsp.DataCount);
341
342 /* fix up the BCC */
343 byte_count = get_bcc(target_hdr);
344 byte_count += total_in_src;
345 /* is the result too big for the field? */
346 if (byte_count > USHRT_MAX) {
347 cifs_dbg(FYI, "coalesced BCC too large (%u)\n", byte_count);
348 return -EPROTO;
349 }
350 put_bcc(byte_count, target_hdr);
351
352 byte_count = be32_to_cpu(target_hdr->smb_buf_length);
353 byte_count += total_in_src;
354 /* don't allow buffer to overflow */
355 if (byte_count > CIFSMaxBufSize + MAX_CIFS_HDR_SIZE - 4) {
356 cifs_dbg(FYI, "coalesced BCC exceeds buffer size (%u)\n",
357 byte_count);
358 return -ENOBUFS;
359 }
360 target_hdr->smb_buf_length = cpu_to_be32(byte_count);
361
362 /* copy second buffer into end of first buffer */
363 memcpy(data_area_of_tgt, data_area_of_src, total_in_src);
364
365 if (remaining != total_in_src) {
366 /* more responses to go */
367 cifs_dbg(FYI, "waiting for more secondary responses\n");
368 return 1;
369 }
370
371 /* we are done */
372 cifs_dbg(FYI, "found the last secondary response\n");
373 return 0;
374}
375
376static void
377cifs_downgrade_oplock(struct TCP_Server_Info *server,
378 struct cifsInodeInfo *cinode, bool set_level2)
379{
380 if (set_level2)
381 cifs_set_oplock_level(cinode, OPLOCK_READ);
382 else
383 cifs_set_oplock_level(cinode, 0);
384}
385
386static bool
387cifs_check_trans2(struct mid_q_entry *mid, struct TCP_Server_Info *server,
388 char *buf, int malformed)
389{
390 if (malformed)
391 return false;
392 if (check2ndT2(buf) <= 0)
393 return false;
394 mid->multiRsp = true;
395 if (mid->resp_buf) {
396 /* merge response - fix up 1st*/
397 malformed = coalesce_t2(buf, mid->resp_buf);
398 if (malformed > 0)
399 return true;
400 /* All parts received or packet is malformed. */
401 mid->multiEnd = true;
402 dequeue_mid(mid, malformed);
403 return true;
404 }
405 if (!server->large_buf) {
406 /*FIXME: switch to already allocated largebuf?*/
407 cifs_dbg(VFS, "1st trans2 resp needs bigbuf\n");
408 } else {
409 /* Have first buffer */
410 mid->resp_buf = buf;
411 mid->large_buf = true;
412 server->bigbuf = NULL;
413 }
414 return true;
415}
416
417static bool
418cifs_need_neg(struct TCP_Server_Info *server)
419{
420 return server->maxBuf == 0;
421}
422
423static int
424cifs_negotiate(const unsigned int xid, struct cifs_ses *ses)
425{
426 int rc;
427 rc = CIFSSMBNegotiate(xid, ses);
428 if (rc == -EAGAIN) {
429 /* retry only once on 1st time connection */
430 set_credits(ses->server, 1);
431 rc = CIFSSMBNegotiate(xid, ses);
432 if (rc == -EAGAIN)
433 rc = -EHOSTDOWN;
434 }
435 return rc;
436}
437
438static unsigned int
439cifs_negotiate_wsize(struct cifs_tcon *tcon, struct smb_vol *volume_info)
440{
441 __u64 unix_cap = le64_to_cpu(tcon->fsUnixInfo.Capability);
442 struct TCP_Server_Info *server = tcon->ses->server;
443 unsigned int wsize;
444
445 /* start with specified wsize, or default */
446 if (volume_info->wsize)
447 wsize = volume_info->wsize;
448 else if (tcon->unix_ext && (unix_cap & CIFS_UNIX_LARGE_WRITE_CAP))
449 wsize = CIFS_DEFAULT_IOSIZE;
450 else
451 wsize = CIFS_DEFAULT_NON_POSIX_WSIZE;
452
453 /* can server support 24-bit write sizes? (via UNIX extensions) */
454 if (!tcon->unix_ext || !(unix_cap & CIFS_UNIX_LARGE_WRITE_CAP))
455 wsize = min_t(unsigned int, wsize, CIFS_MAX_RFC1002_WSIZE);
456
457 /*
458 * no CAP_LARGE_WRITE_X or is signing enabled without CAP_UNIX set?
459 * Limit it to max buffer offered by the server, minus the size of the
460 * WRITEX header, not including the 4 byte RFC1001 length.
461 */
462 if (!(server->capabilities & CAP_LARGE_WRITE_X) ||
463 (!(server->capabilities & CAP_UNIX) && server->sign))
464 wsize = min_t(unsigned int, wsize,
465 server->maxBuf - sizeof(WRITE_REQ) + 4);
466
467 /* hard limit of CIFS_MAX_WSIZE */
468 wsize = min_t(unsigned int, wsize, CIFS_MAX_WSIZE);
469
470 return wsize;
471}
472
473static unsigned int
474cifs_negotiate_rsize(struct cifs_tcon *tcon, struct smb_vol *volume_info)
475{
476 __u64 unix_cap = le64_to_cpu(tcon->fsUnixInfo.Capability);
477 struct TCP_Server_Info *server = tcon->ses->server;
478 unsigned int rsize, defsize;
479
480 /*
481 * Set default value...
482 *
483 * HACK alert! Ancient servers have very small buffers. Even though
484 * MS-CIFS indicates that servers are only limited by the client's
485 * bufsize for reads, testing against win98se shows that it throws
486 * INVALID_PARAMETER errors if you try to request too large a read.
487 * OS/2 just sends back short reads.
488 *
489 * If the server doesn't advertise CAP_LARGE_READ_X, then assume that
490 * it can't handle a read request larger than its MaxBufferSize either.
491 */
492 if (tcon->unix_ext && (unix_cap & CIFS_UNIX_LARGE_READ_CAP))
493 defsize = CIFS_DEFAULT_IOSIZE;
494 else if (server->capabilities & CAP_LARGE_READ_X)
495 defsize = CIFS_DEFAULT_NON_POSIX_RSIZE;
496 else
497 defsize = server->maxBuf - sizeof(READ_RSP);
498
499 rsize = volume_info->rsize ? volume_info->rsize : defsize;
500
501 /*
502 * no CAP_LARGE_READ_X? Then MS-CIFS states that we must limit this to
503 * the client's MaxBufferSize.
504 */
505 if (!(server->capabilities & CAP_LARGE_READ_X))
506 rsize = min_t(unsigned int, CIFSMaxBufSize, rsize);
507
508 /* hard limit of CIFS_MAX_RSIZE */
509 rsize = min_t(unsigned int, rsize, CIFS_MAX_RSIZE);
510
511 return rsize;
512}
513
514static void
515cifs_qfs_tcon(const unsigned int xid, struct cifs_tcon *tcon)
516{
517 CIFSSMBQFSDeviceInfo(xid, tcon);
518 CIFSSMBQFSAttributeInfo(xid, tcon);
519}
520
521static int
522cifs_is_path_accessible(const unsigned int xid, struct cifs_tcon *tcon,
523 struct cifs_sb_info *cifs_sb, const char *full_path)
524{
525 int rc;
526 FILE_ALL_INFO *file_info;
527
528 file_info = kmalloc(sizeof(FILE_ALL_INFO), GFP_KERNEL);
529 if (file_info == NULL)
530 return -ENOMEM;
531
532 rc = CIFSSMBQPathInfo(xid, tcon, full_path, file_info,
533 0 /* not legacy */, cifs_sb->local_nls,
534 cifs_remap(cifs_sb));
535
536 if (rc == -EOPNOTSUPP || rc == -EINVAL)
537 rc = SMBQueryInformation(xid, tcon, full_path, file_info,
538 cifs_sb->local_nls, cifs_remap(cifs_sb));
539 kfree(file_info);
540 return rc;
541}
542
543static int
544cifs_query_path_info(const unsigned int xid, struct cifs_tcon *tcon,
545 struct cifs_sb_info *cifs_sb, const char *full_path,
546 FILE_ALL_INFO *data, bool *adjustTZ, bool *symlink)
547{
548 int rc;
549
550 *symlink = false;
551
552 /* could do find first instead but this returns more info */
553 rc = CIFSSMBQPathInfo(xid, tcon, full_path, data, 0 /* not legacy */,
554 cifs_sb->local_nls, cifs_remap(cifs_sb));
555 /*
556 * BB optimize code so we do not make the above call when server claims
557 * no NT SMB support and the above call failed at least once - set flag
558 * in tcon or mount.
559 */
560 if ((rc == -EOPNOTSUPP) || (rc == -EINVAL)) {
561 rc = SMBQueryInformation(xid, tcon, full_path, data,
562 cifs_sb->local_nls,
563 cifs_remap(cifs_sb));
564 *adjustTZ = true;
565 }
566
567 if (!rc && (le32_to_cpu(data->Attributes) & ATTR_REPARSE)) {
568 int tmprc;
569 int oplock = 0;
570 struct cifs_fid fid;
571 struct cifs_open_parms oparms;
572
573 oparms.tcon = tcon;
574 oparms.cifs_sb = cifs_sb;
575 oparms.desired_access = FILE_READ_ATTRIBUTES;
576 oparms.create_options = 0;
577 oparms.disposition = FILE_OPEN;
578 oparms.path = full_path;
579 oparms.fid = &fid;
580 oparms.reconnect = false;
581
582 /* Need to check if this is a symbolic link or not */
583 tmprc = CIFS_open(xid, &oparms, &oplock, NULL);
584 if (tmprc == -EOPNOTSUPP)
585 *symlink = true;
586 else if (tmprc == 0)
587 CIFSSMBClose(xid, tcon, fid.netfid);
588 }
589
590 return rc;
591}
592
593static int
594cifs_get_srv_inum(const unsigned int xid, struct cifs_tcon *tcon,
595 struct cifs_sb_info *cifs_sb, const char *full_path,
596 u64 *uniqueid, FILE_ALL_INFO *data)
597{
598 /*
599 * We can not use the IndexNumber field by default from Windows or
600 * Samba (in ALL_INFO buf) but we can request it explicitly. The SNIA
601 * CIFS spec claims that this value is unique within the scope of a
602 * share, and the windows docs hint that it's actually unique
603 * per-machine.
604 *
605 * There may be higher info levels that work but are there Windows
606 * server or network appliances for which IndexNumber field is not
607 * guaranteed unique?
608 */
609 return CIFSGetSrvInodeNumber(xid, tcon, full_path, uniqueid,
610 cifs_sb->local_nls,
611 cifs_remap(cifs_sb));
612}
613
614static int
615cifs_query_file_info(const unsigned int xid, struct cifs_tcon *tcon,
616 struct cifs_fid *fid, FILE_ALL_INFO *data)
617{
618 return CIFSSMBQFileInfo(xid, tcon, fid->netfid, data);
619}
620
621static void
622cifs_clear_stats(struct cifs_tcon *tcon)
623{
624#ifdef CONFIG_CIFS_STATS
625 atomic_set(&tcon->stats.cifs_stats.num_writes, 0);
626 atomic_set(&tcon->stats.cifs_stats.num_reads, 0);
627 atomic_set(&tcon->stats.cifs_stats.num_flushes, 0);
628 atomic_set(&tcon->stats.cifs_stats.num_oplock_brks, 0);
629 atomic_set(&tcon->stats.cifs_stats.num_opens, 0);
630 atomic_set(&tcon->stats.cifs_stats.num_posixopens, 0);
631 atomic_set(&tcon->stats.cifs_stats.num_posixmkdirs, 0);
632 atomic_set(&tcon->stats.cifs_stats.num_closes, 0);
633 atomic_set(&tcon->stats.cifs_stats.num_deletes, 0);
634 atomic_set(&tcon->stats.cifs_stats.num_mkdirs, 0);
635 atomic_set(&tcon->stats.cifs_stats.num_rmdirs, 0);
636 atomic_set(&tcon->stats.cifs_stats.num_renames, 0);
637 atomic_set(&tcon->stats.cifs_stats.num_t2renames, 0);
638 atomic_set(&tcon->stats.cifs_stats.num_ffirst, 0);
639 atomic_set(&tcon->stats.cifs_stats.num_fnext, 0);
640 atomic_set(&tcon->stats.cifs_stats.num_fclose, 0);
641 atomic_set(&tcon->stats.cifs_stats.num_hardlinks, 0);
642 atomic_set(&tcon->stats.cifs_stats.num_symlinks, 0);
643 atomic_set(&tcon->stats.cifs_stats.num_locks, 0);
644 atomic_set(&tcon->stats.cifs_stats.num_acl_get, 0);
645 atomic_set(&tcon->stats.cifs_stats.num_acl_set, 0);
646#endif
647}
648
649static void
650cifs_print_stats(struct seq_file *m, struct cifs_tcon *tcon)
651{
652#ifdef CONFIG_CIFS_STATS
653 seq_printf(m, " Oplocks breaks: %d",
654 atomic_read(&tcon->stats.cifs_stats.num_oplock_brks));
655 seq_printf(m, "\nReads: %d Bytes: %llu",
656 atomic_read(&tcon->stats.cifs_stats.num_reads),
657 (long long)(tcon->bytes_read));
658 seq_printf(m, "\nWrites: %d Bytes: %llu",
659 atomic_read(&tcon->stats.cifs_stats.num_writes),
660 (long long)(tcon->bytes_written));
661 seq_printf(m, "\nFlushes: %d",
662 atomic_read(&tcon->stats.cifs_stats.num_flushes));
663 seq_printf(m, "\nLocks: %d HardLinks: %d Symlinks: %d",
664 atomic_read(&tcon->stats.cifs_stats.num_locks),
665 atomic_read(&tcon->stats.cifs_stats.num_hardlinks),
666 atomic_read(&tcon->stats.cifs_stats.num_symlinks));
667 seq_printf(m, "\nOpens: %d Closes: %d Deletes: %d",
668 atomic_read(&tcon->stats.cifs_stats.num_opens),
669 atomic_read(&tcon->stats.cifs_stats.num_closes),
670 atomic_read(&tcon->stats.cifs_stats.num_deletes));
671 seq_printf(m, "\nPosix Opens: %d Posix Mkdirs: %d",
672 atomic_read(&tcon->stats.cifs_stats.num_posixopens),
673 atomic_read(&tcon->stats.cifs_stats.num_posixmkdirs));
674 seq_printf(m, "\nMkdirs: %d Rmdirs: %d",
675 atomic_read(&tcon->stats.cifs_stats.num_mkdirs),
676 atomic_read(&tcon->stats.cifs_stats.num_rmdirs));
677 seq_printf(m, "\nRenames: %d T2 Renames %d",
678 atomic_read(&tcon->stats.cifs_stats.num_renames),
679 atomic_read(&tcon->stats.cifs_stats.num_t2renames));
680 seq_printf(m, "\nFindFirst: %d FNext %d FClose %d",
681 atomic_read(&tcon->stats.cifs_stats.num_ffirst),
682 atomic_read(&tcon->stats.cifs_stats.num_fnext),
683 atomic_read(&tcon->stats.cifs_stats.num_fclose));
684#endif
685}
686
687static void
688cifs_mkdir_setinfo(struct inode *inode, const char *full_path,
689 struct cifs_sb_info *cifs_sb, struct cifs_tcon *tcon,
690 const unsigned int xid)
691{
692 FILE_BASIC_INFO info;
693 struct cifsInodeInfo *cifsInode;
694 u32 dosattrs;
695 int rc;
696
697 memset(&info, 0, sizeof(info));
698 cifsInode = CIFS_I(inode);
699 dosattrs = cifsInode->cifsAttrs|ATTR_READONLY;
700 info.Attributes = cpu_to_le32(dosattrs);
701 rc = CIFSSMBSetPathInfo(xid, tcon, full_path, &info, cifs_sb->local_nls,
702 cifs_remap(cifs_sb));
703 if (rc == 0)
704 cifsInode->cifsAttrs = dosattrs;
705}
706
707static int
708cifs_open_file(const unsigned int xid, struct cifs_open_parms *oparms,
709 __u32 *oplock, FILE_ALL_INFO *buf)
710{
711 if (!(oparms->tcon->ses->capabilities & CAP_NT_SMBS))
712 return SMBLegacyOpen(xid, oparms->tcon, oparms->path,
713 oparms->disposition,
714 oparms->desired_access,
715 oparms->create_options,
716 &oparms->fid->netfid, oplock, buf,
717 oparms->cifs_sb->local_nls,
718 cifs_remap(oparms->cifs_sb));
719 return CIFS_open(xid, oparms, oplock, buf);
720}
721
722static void
723cifs_set_fid(struct cifsFileInfo *cfile, struct cifs_fid *fid, __u32 oplock)
724{
725 struct cifsInodeInfo *cinode = CIFS_I(d_inode(cfile->dentry));
726 cfile->fid.netfid = fid->netfid;
727 cifs_set_oplock_level(cinode, oplock);
728 cinode->can_cache_brlcks = CIFS_CACHE_WRITE(cinode);
729}
730
731static void
732cifs_close_file(const unsigned int xid, struct cifs_tcon *tcon,
733 struct cifs_fid *fid)
734{
735 CIFSSMBClose(xid, tcon, fid->netfid);
736}
737
738static int
739cifs_flush_file(const unsigned int xid, struct cifs_tcon *tcon,
740 struct cifs_fid *fid)
741{
742 return CIFSSMBFlush(xid, tcon, fid->netfid);
743}
744
745static int
746cifs_sync_read(const unsigned int xid, struct cifs_fid *pfid,
747 struct cifs_io_parms *parms, unsigned int *bytes_read,
748 char **buf, int *buf_type)
749{
750 parms->netfid = pfid->netfid;
751 return CIFSSMBRead(xid, parms, bytes_read, buf, buf_type);
752}
753
754static int
755cifs_sync_write(const unsigned int xid, struct cifs_fid *pfid,
756 struct cifs_io_parms *parms, unsigned int *written,
757 struct kvec *iov, unsigned long nr_segs)
758{
759
760 parms->netfid = pfid->netfid;
761 return CIFSSMBWrite2(xid, parms, written, iov, nr_segs);
762}
763
764static int
765smb_set_file_info(struct inode *inode, const char *full_path,
766 FILE_BASIC_INFO *buf, const unsigned int xid)
767{
768 int oplock = 0;
769 int rc;
770 __u32 netpid;
771 struct cifs_fid fid;
772 struct cifs_open_parms oparms;
773 struct cifsFileInfo *open_file;
774 struct cifsInodeInfo *cinode = CIFS_I(inode);
775 struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
776 struct tcon_link *tlink = NULL;
777 struct cifs_tcon *tcon;
778
779 /* if the file is already open for write, just use that fileid */
780 open_file = find_writable_file(cinode, true);
781 if (open_file) {
782 fid.netfid = open_file->fid.netfid;
783 netpid = open_file->pid;
784 tcon = tlink_tcon(open_file->tlink);
785 goto set_via_filehandle;
786 }
787
788 tlink = cifs_sb_tlink(cifs_sb);
789 if (IS_ERR(tlink)) {
790 rc = PTR_ERR(tlink);
791 tlink = NULL;
792 goto out;
793 }
794 tcon = tlink_tcon(tlink);
795
796 rc = CIFSSMBSetPathInfo(xid, tcon, full_path, buf, cifs_sb->local_nls,
797 cifs_remap(cifs_sb));
798 if (rc == 0) {
799 cinode->cifsAttrs = le32_to_cpu(buf->Attributes);
800 goto out;
801 } else if (rc != -EOPNOTSUPP && rc != -EINVAL) {
802 goto out;
803 }
804
805 oparms.tcon = tcon;
806 oparms.cifs_sb = cifs_sb;
807 oparms.desired_access = SYNCHRONIZE | FILE_WRITE_ATTRIBUTES;
808 oparms.create_options = CREATE_NOT_DIR;
809 oparms.disposition = FILE_OPEN;
810 oparms.path = full_path;
811 oparms.fid = &fid;
812 oparms.reconnect = false;
813
814 cifs_dbg(FYI, "calling SetFileInfo since SetPathInfo for times not supported by this server\n");
815 rc = CIFS_open(xid, &oparms, &oplock, NULL);
816 if (rc != 0) {
817 if (rc == -EIO)
818 rc = -EINVAL;
819 goto out;
820 }
821
822 netpid = current->tgid;
823
824set_via_filehandle:
825 rc = CIFSSMBSetFileInfo(xid, tcon, buf, fid.netfid, netpid);
826 if (!rc)
827 cinode->cifsAttrs = le32_to_cpu(buf->Attributes);
828
829 if (open_file == NULL)
830 CIFSSMBClose(xid, tcon, fid.netfid);
831 else
832 cifsFileInfo_put(open_file);
833out:
834 if (tlink != NULL)
835 cifs_put_tlink(tlink);
836 return rc;
837}
838
839static int
840cifs_set_compression(const unsigned int xid, struct cifs_tcon *tcon,
841 struct cifsFileInfo *cfile)
842{
843 return CIFSSMB_set_compression(xid, tcon, cfile->fid.netfid);
844}
845
846static int
847cifs_query_dir_first(const unsigned int xid, struct cifs_tcon *tcon,
848 const char *path, struct cifs_sb_info *cifs_sb,
849 struct cifs_fid *fid, __u16 search_flags,
850 struct cifs_search_info *srch_inf)
851{
852 return CIFSFindFirst(xid, tcon, path, cifs_sb,
853 &fid->netfid, search_flags, srch_inf, true);
854}
855
856static int
857cifs_query_dir_next(const unsigned int xid, struct cifs_tcon *tcon,
858 struct cifs_fid *fid, __u16 search_flags,
859 struct cifs_search_info *srch_inf)
860{
861 return CIFSFindNext(xid, tcon, fid->netfid, search_flags, srch_inf);
862}
863
864static int
865cifs_close_dir(const unsigned int xid, struct cifs_tcon *tcon,
866 struct cifs_fid *fid)
867{
868 return CIFSFindClose(xid, tcon, fid->netfid);
869}
870
871static int
872cifs_oplock_response(struct cifs_tcon *tcon, struct cifs_fid *fid,
873 struct cifsInodeInfo *cinode)
874{
875 return CIFSSMBLock(0, tcon, fid->netfid, current->tgid, 0, 0, 0, 0,
876 LOCKING_ANDX_OPLOCK_RELEASE, false,
877 CIFS_CACHE_READ(cinode) ? 1 : 0);
878}
879
880static int
881cifs_queryfs(const unsigned int xid, struct cifs_tcon *tcon,
882 struct kstatfs *buf)
883{
884 int rc = -EOPNOTSUPP;
885
886 buf->f_type = CIFS_MAGIC_NUMBER;
887
888 /*
889 * We could add a second check for a QFS Unix capability bit
890 */
891 if ((tcon->ses->capabilities & CAP_UNIX) &&
892 (CIFS_POSIX_EXTENSIONS & le64_to_cpu(tcon->fsUnixInfo.Capability)))
893 rc = CIFSSMBQFSPosixInfo(xid, tcon, buf);
894
895 /*
896 * Only need to call the old QFSInfo if failed on newer one,
897 * e.g. by OS/2.
898 **/
899 if (rc && (tcon->ses->capabilities & CAP_NT_SMBS))
900 rc = CIFSSMBQFSInfo(xid, tcon, buf);
901
902 /*
903 * Some old Windows servers also do not support level 103, retry with
904 * older level one if old server failed the previous call or we
905 * bypassed it because we detected that this was an older LANMAN sess
906 */
907 if (rc)
908 rc = SMBOldQFSInfo(xid, tcon, buf);
909 return rc;
910}
911
912static int
913cifs_mand_lock(const unsigned int xid, struct cifsFileInfo *cfile, __u64 offset,
914 __u64 length, __u32 type, int lock, int unlock, bool wait)
915{
916 return CIFSSMBLock(xid, tlink_tcon(cfile->tlink), cfile->fid.netfid,
917 current->tgid, length, offset, unlock, lock,
918 (__u8)type, wait, 0);
919}
920
921static int
922cifs_unix_dfs_readlink(const unsigned int xid, struct cifs_tcon *tcon,
923 const unsigned char *searchName, char **symlinkinfo,
924 const struct nls_table *nls_codepage)
925{
926#ifdef CONFIG_CIFS_DFS_UPCALL
927 int rc;
928 unsigned int num_referrals = 0;
929 struct dfs_info3_param *referrals = NULL;
930
931 rc = get_dfs_path(xid, tcon->ses, searchName, nls_codepage,
932 &num_referrals, &referrals, 0);
933
934 if (!rc && num_referrals > 0) {
935 *symlinkinfo = kstrndup(referrals->node_name,
936 strlen(referrals->node_name),
937 GFP_KERNEL);
938 if (!*symlinkinfo)
939 rc = -ENOMEM;
940 free_dfs_info_array(referrals, num_referrals);
941 }
942 return rc;
943#else /* No DFS support */
944 return -EREMOTE;
945#endif
946}
947
948static int
949cifs_query_symlink(const unsigned int xid, struct cifs_tcon *tcon,
950 const char *full_path, char **target_path,
951 struct cifs_sb_info *cifs_sb)
952{
953 int rc;
954 int oplock = 0;
955 struct cifs_fid fid;
956 struct cifs_open_parms oparms;
957
958 cifs_dbg(FYI, "%s: path: %s\n", __func__, full_path);
959
960 /* Check for unix extensions */
961 if (cap_unix(tcon->ses)) {
962 rc = CIFSSMBUnixQuerySymLink(xid, tcon, full_path, target_path,
963 cifs_sb->local_nls,
964 cifs_remap(cifs_sb));
965 if (rc == -EREMOTE)
966 rc = cifs_unix_dfs_readlink(xid, tcon, full_path,
967 target_path,
968 cifs_sb->local_nls);
969
970 goto out;
971 }
972
973 oparms.tcon = tcon;
974 oparms.cifs_sb = cifs_sb;
975 oparms.desired_access = FILE_READ_ATTRIBUTES;
976 oparms.create_options = OPEN_REPARSE_POINT;
977 oparms.disposition = FILE_OPEN;
978 oparms.path = full_path;
979 oparms.fid = &fid;
980 oparms.reconnect = false;
981
982 rc = CIFS_open(xid, &oparms, &oplock, NULL);
983 if (rc)
984 goto out;
985
986 rc = CIFSSMBQuerySymLink(xid, tcon, fid.netfid, target_path,
987 cifs_sb->local_nls);
988 if (rc)
989 goto out_close;
990
991 convert_delimiter(*target_path, '/');
992out_close:
993 CIFSSMBClose(xid, tcon, fid.netfid);
994out:
995 if (!rc)
996 cifs_dbg(FYI, "%s: target path: %s\n", __func__, *target_path);
997 return rc;
998}
999
1000static bool
1001cifs_is_read_op(__u32 oplock)
1002{
1003 return oplock == OPLOCK_READ;
1004}
1005
1006static unsigned int
1007cifs_wp_retry_size(struct inode *inode)
1008{
1009 return CIFS_SB(inode->i_sb)->wsize;
1010}
1011
1012static bool
1013cifs_dir_needs_close(struct cifsFileInfo *cfile)
1014{
1015 return !cfile->srch_inf.endOfSearch && !cfile->invalidHandle;
1016}
1017
1018struct smb_version_operations smb1_operations = {
1019 .send_cancel = send_nt_cancel,
1020 .compare_fids = cifs_compare_fids,
1021 .setup_request = cifs_setup_request,
1022 .setup_async_request = cifs_setup_async_request,
1023 .check_receive = cifs_check_receive,
1024 .add_credits = cifs_add_credits,
1025 .set_credits = cifs_set_credits,
1026 .get_credits_field = cifs_get_credits_field,
1027 .get_credits = cifs_get_credits,
1028 .wait_mtu_credits = cifs_wait_mtu_credits,
1029 .get_next_mid = cifs_get_next_mid,
1030 .read_data_offset = cifs_read_data_offset,
1031 .read_data_length = cifs_read_data_length,
1032 .map_error = map_smb_to_linux_error,
1033 .find_mid = cifs_find_mid,
1034 .check_message = checkSMB,
1035 .dump_detail = cifs_dump_detail,
1036 .clear_stats = cifs_clear_stats,
1037 .print_stats = cifs_print_stats,
1038 .is_oplock_break = is_valid_oplock_break,
1039 .downgrade_oplock = cifs_downgrade_oplock,
1040 .check_trans2 = cifs_check_trans2,
1041 .need_neg = cifs_need_neg,
1042 .negotiate = cifs_negotiate,
1043 .negotiate_wsize = cifs_negotiate_wsize,
1044 .negotiate_rsize = cifs_negotiate_rsize,
1045 .sess_setup = CIFS_SessSetup,
1046 .logoff = CIFSSMBLogoff,
1047 .tree_connect = CIFSTCon,
1048 .tree_disconnect = CIFSSMBTDis,
1049 .get_dfs_refer = CIFSGetDFSRefer,
1050 .qfs_tcon = cifs_qfs_tcon,
1051 .is_path_accessible = cifs_is_path_accessible,
1052 .query_path_info = cifs_query_path_info,
1053 .query_file_info = cifs_query_file_info,
1054 .get_srv_inum = cifs_get_srv_inum,
1055 .set_path_size = CIFSSMBSetEOF,
1056 .set_file_size = CIFSSMBSetFileSize,
1057 .set_file_info = smb_set_file_info,
1058 .set_compression = cifs_set_compression,
1059 .echo = CIFSSMBEcho,
1060 .mkdir = CIFSSMBMkDir,
1061 .mkdir_setinfo = cifs_mkdir_setinfo,
1062 .rmdir = CIFSSMBRmDir,
1063 .unlink = CIFSSMBDelFile,
1064 .rename_pending_delete = cifs_rename_pending_delete,
1065 .rename = CIFSSMBRename,
1066 .create_hardlink = CIFSCreateHardLink,
1067 .query_symlink = cifs_query_symlink,
1068 .open = cifs_open_file,
1069 .set_fid = cifs_set_fid,
1070 .close = cifs_close_file,
1071 .flush = cifs_flush_file,
1072 .async_readv = cifs_async_readv,
1073 .async_writev = cifs_async_writev,
1074 .sync_read = cifs_sync_read,
1075 .sync_write = cifs_sync_write,
1076 .query_dir_first = cifs_query_dir_first,
1077 .query_dir_next = cifs_query_dir_next,
1078 .close_dir = cifs_close_dir,
1079 .calc_smb_size = smbCalcSize,
1080 .oplock_response = cifs_oplock_response,
1081 .queryfs = cifs_queryfs,
1082 .mand_lock = cifs_mand_lock,
1083 .mand_unlock_range = cifs_unlock_range,
1084 .push_mand_locks = cifs_push_mandatory_locks,
1085 .query_mf_symlink = cifs_query_mf_symlink,
1086 .create_mf_symlink = cifs_create_mf_symlink,
1087 .is_read_op = cifs_is_read_op,
1088 .wp_retry_size = cifs_wp_retry_size,
1089 .dir_needs_close = cifs_dir_needs_close,
1090#ifdef CONFIG_CIFS_XATTR
1091 .query_all_EAs = CIFSSMBQAllEAs,
1092 .set_EA = CIFSSMBSetEA,
1093#endif /* CIFS_XATTR */
1094#ifdef CONFIG_CIFS_ACL
1095 .get_acl = get_cifs_acl,
1096 .get_acl_by_fid = get_cifs_acl_by_fid,
1097 .set_acl = set_cifs_acl,
1098#endif /* CIFS_ACL */
1099};
1100
1101struct smb_version_values smb1_values = {
1102 .version_string = SMB1_VERSION_STRING,
1103 .large_lock_type = LOCKING_ANDX_LARGE_FILES,
1104 .exclusive_lock_type = 0,
1105 .shared_lock_type = LOCKING_ANDX_SHARED_LOCK,
1106 .unlock_lock_type = 0,
1107 .header_size = sizeof(struct smb_hdr),
1108 .max_header_size = MAX_CIFS_HDR_SIZE,
1109 .read_rsp_size = sizeof(READ_RSP),
1110 .lock_cmd = cpu_to_le16(SMB_COM_LOCKING_ANDX),
1111 .cap_unix = CAP_UNIX,
1112 .cap_nt_find = CAP_NT_SMBS | CAP_NT_FIND,
1113 .cap_large_files = CAP_LARGE_FILES,
1114 .signing_enabled = SECMODE_SIGN_ENABLED,
1115 .signing_required = SECMODE_SIGN_REQUIRED,
1116};