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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, struct smb_rqst *rqst,
40 struct mid_q_entry *mid)
41{
42 int rc = 0;
43 struct smb_hdr *in_buf = (struct smb_hdr *)rqst->rq_iov[0].iov_base;
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, bool in_remaining)
91{
92 READ_RSP *rsp = (READ_RSP *)buf;
93 /* It's a bug reading remaining data for SMB1 packets */
94 WARN_ON(in_remaining);
95 return (le16_to_cpu(rsp->DataLengthHigh) << 16) +
96 le16_to_cpu(rsp->DataLength);
97}
98
99static struct mid_q_entry *
100cifs_find_mid(struct TCP_Server_Info *server, char *buffer)
101{
102 struct smb_hdr *buf = (struct smb_hdr *)buffer;
103 struct mid_q_entry *mid;
104
105 spin_lock(&GlobalMid_Lock);
106 list_for_each_entry(mid, &server->pending_mid_q, qhead) {
107 if (compare_mid(mid->mid, buf) &&
108 mid->mid_state == MID_REQUEST_SUBMITTED &&
109 le16_to_cpu(mid->command) == buf->Command) {
110 spin_unlock(&GlobalMid_Lock);
111 return mid;
112 }
113 }
114 spin_unlock(&GlobalMid_Lock);
115 return NULL;
116}
117
118static void
119cifs_add_credits(struct TCP_Server_Info *server, const unsigned int add,
120 const int optype)
121{
122 spin_lock(&server->req_lock);
123 server->credits += add;
124 server->in_flight--;
125 spin_unlock(&server->req_lock);
126 wake_up(&server->request_q);
127}
128
129static void
130cifs_set_credits(struct TCP_Server_Info *server, const int val)
131{
132 spin_lock(&server->req_lock);
133 server->credits = val;
134 server->oplocks = val > 1 ? enable_oplocks : false;
135 spin_unlock(&server->req_lock);
136}
137
138static int *
139cifs_get_credits_field(struct TCP_Server_Info *server, const int optype)
140{
141 return &server->credits;
142}
143
144static unsigned int
145cifs_get_credits(struct mid_q_entry *mid)
146{
147 return 1;
148}
149
150/*
151 * Find a free multiplex id (SMB mid). Otherwise there could be
152 * mid collisions which might cause problems, demultiplexing the
153 * wrong response to this request. Multiplex ids could collide if
154 * one of a series requests takes much longer than the others, or
155 * if a very large number of long lived requests (byte range
156 * locks or FindNotify requests) are pending. No more than
157 * 64K-1 requests can be outstanding at one time. If no
158 * mids are available, return zero. A future optimization
159 * could make the combination of mids and uid the key we use
160 * to demultiplex on (rather than mid alone).
161 * In addition to the above check, the cifs demultiplex
162 * code already used the command code as a secondary
163 * check of the frame and if signing is negotiated the
164 * response would be discarded if the mid were the same
165 * but the signature was wrong. Since the mid is not put in the
166 * pending queue until later (when it is about to be dispatched)
167 * we do have to limit the number of outstanding requests
168 * to somewhat less than 64K-1 although it is hard to imagine
169 * so many threads being in the vfs at one time.
170 */
171static __u64
172cifs_get_next_mid(struct TCP_Server_Info *server)
173{
174 __u64 mid = 0;
175 __u16 last_mid, cur_mid;
176 bool collision;
177
178 spin_lock(&GlobalMid_Lock);
179
180 /* mid is 16 bit only for CIFS/SMB */
181 cur_mid = (__u16)((server->CurrentMid) & 0xffff);
182 /* we do not want to loop forever */
183 last_mid = cur_mid;
184 cur_mid++;
185
186 /*
187 * This nested loop looks more expensive than it is.
188 * In practice the list of pending requests is short,
189 * fewer than 50, and the mids are likely to be unique
190 * on the first pass through the loop unless some request
191 * takes longer than the 64 thousand requests before it
192 * (and it would also have to have been a request that
193 * did not time out).
194 */
195 while (cur_mid != last_mid) {
196 struct mid_q_entry *mid_entry;
197 unsigned int num_mids;
198
199 collision = false;
200 if (cur_mid == 0)
201 cur_mid++;
202
203 num_mids = 0;
204 list_for_each_entry(mid_entry, &server->pending_mid_q, qhead) {
205 ++num_mids;
206 if (mid_entry->mid == cur_mid &&
207 mid_entry->mid_state == MID_REQUEST_SUBMITTED) {
208 /* This mid is in use, try a different one */
209 collision = true;
210 break;
211 }
212 }
213
214 /*
215 * if we have more than 32k mids in the list, then something
216 * is very wrong. Possibly a local user is trying to DoS the
217 * box by issuing long-running calls and SIGKILL'ing them. If
218 * we get to 2^16 mids then we're in big trouble as this
219 * function could loop forever.
220 *
221 * Go ahead and assign out the mid in this situation, but force
222 * an eventual reconnect to clean out the pending_mid_q.
223 */
224 if (num_mids > 32768)
225 server->tcpStatus = CifsNeedReconnect;
226
227 if (!collision) {
228 mid = (__u64)cur_mid;
229 server->CurrentMid = mid;
230 break;
231 }
232 cur_mid++;
233 }
234 spin_unlock(&GlobalMid_Lock);
235 return mid;
236}
237
238/*
239 return codes:
240 0 not a transact2, or all data present
241 >0 transact2 with that much data missing
242 -EINVAL invalid transact2
243 */
244static int
245check2ndT2(char *buf)
246{
247 struct smb_hdr *pSMB = (struct smb_hdr *)buf;
248 struct smb_t2_rsp *pSMBt;
249 int remaining;
250 __u16 total_data_size, data_in_this_rsp;
251
252 if (pSMB->Command != SMB_COM_TRANSACTION2)
253 return 0;
254
255 /* check for plausible wct, bcc and t2 data and parm sizes */
256 /* check for parm and data offset going beyond end of smb */
257 if (pSMB->WordCount != 10) { /* coalesce_t2 depends on this */
258 cifs_dbg(FYI, "invalid transact2 word count\n");
259 return -EINVAL;
260 }
261
262 pSMBt = (struct smb_t2_rsp *)pSMB;
263
264 total_data_size = get_unaligned_le16(&pSMBt->t2_rsp.TotalDataCount);
265 data_in_this_rsp = get_unaligned_le16(&pSMBt->t2_rsp.DataCount);
266
267 if (total_data_size == data_in_this_rsp)
268 return 0;
269 else if (total_data_size < data_in_this_rsp) {
270 cifs_dbg(FYI, "total data %d smaller than data in frame %d\n",
271 total_data_size, data_in_this_rsp);
272 return -EINVAL;
273 }
274
275 remaining = total_data_size - data_in_this_rsp;
276
277 cifs_dbg(FYI, "missing %d bytes from transact2, check next response\n",
278 remaining);
279 if (total_data_size > CIFSMaxBufSize) {
280 cifs_dbg(VFS, "TotalDataSize %d is over maximum buffer %d\n",
281 total_data_size, CIFSMaxBufSize);
282 return -EINVAL;
283 }
284 return remaining;
285}
286
287static int
288coalesce_t2(char *second_buf, struct smb_hdr *target_hdr)
289{
290 struct smb_t2_rsp *pSMBs = (struct smb_t2_rsp *)second_buf;
291 struct smb_t2_rsp *pSMBt = (struct smb_t2_rsp *)target_hdr;
292 char *data_area_of_tgt;
293 char *data_area_of_src;
294 int remaining;
295 unsigned int byte_count, total_in_tgt;
296 __u16 tgt_total_cnt, src_total_cnt, total_in_src;
297
298 src_total_cnt = get_unaligned_le16(&pSMBs->t2_rsp.TotalDataCount);
299 tgt_total_cnt = get_unaligned_le16(&pSMBt->t2_rsp.TotalDataCount);
300
301 if (tgt_total_cnt != src_total_cnt)
302 cifs_dbg(FYI, "total data count of primary and secondary t2 differ source=%hu target=%hu\n",
303 src_total_cnt, tgt_total_cnt);
304
305 total_in_tgt = get_unaligned_le16(&pSMBt->t2_rsp.DataCount);
306
307 remaining = tgt_total_cnt - total_in_tgt;
308
309 if (remaining < 0) {
310 cifs_dbg(FYI, "Server sent too much data. tgt_total_cnt=%hu total_in_tgt=%hu\n",
311 tgt_total_cnt, total_in_tgt);
312 return -EPROTO;
313 }
314
315 if (remaining == 0) {
316 /* nothing to do, ignore */
317 cifs_dbg(FYI, "no more data remains\n");
318 return 0;
319 }
320
321 total_in_src = get_unaligned_le16(&pSMBs->t2_rsp.DataCount);
322 if (remaining < total_in_src)
323 cifs_dbg(FYI, "transact2 2nd response contains too much data\n");
324
325 /* find end of first SMB data area */
326 data_area_of_tgt = (char *)&pSMBt->hdr.Protocol +
327 get_unaligned_le16(&pSMBt->t2_rsp.DataOffset);
328
329 /* validate target area */
330 data_area_of_src = (char *)&pSMBs->hdr.Protocol +
331 get_unaligned_le16(&pSMBs->t2_rsp.DataOffset);
332
333 data_area_of_tgt += total_in_tgt;
334
335 total_in_tgt += total_in_src;
336 /* is the result too big for the field? */
337 if (total_in_tgt > USHRT_MAX) {
338 cifs_dbg(FYI, "coalesced DataCount too large (%u)\n",
339 total_in_tgt);
340 return -EPROTO;
341 }
342 put_unaligned_le16(total_in_tgt, &pSMBt->t2_rsp.DataCount);
343
344 /* fix up the BCC */
345 byte_count = get_bcc(target_hdr);
346 byte_count += total_in_src;
347 /* is the result too big for the field? */
348 if (byte_count > USHRT_MAX) {
349 cifs_dbg(FYI, "coalesced BCC too large (%u)\n", byte_count);
350 return -EPROTO;
351 }
352 put_bcc(byte_count, target_hdr);
353
354 byte_count = be32_to_cpu(target_hdr->smb_buf_length);
355 byte_count += total_in_src;
356 /* don't allow buffer to overflow */
357 if (byte_count > CIFSMaxBufSize + MAX_CIFS_HDR_SIZE - 4) {
358 cifs_dbg(FYI, "coalesced BCC exceeds buffer size (%u)\n",
359 byte_count);
360 return -ENOBUFS;
361 }
362 target_hdr->smb_buf_length = cpu_to_be32(byte_count);
363
364 /* copy second buffer into end of first buffer */
365 memcpy(data_area_of_tgt, data_area_of_src, total_in_src);
366
367 if (remaining != total_in_src) {
368 /* more responses to go */
369 cifs_dbg(FYI, "waiting for more secondary responses\n");
370 return 1;
371 }
372
373 /* we are done */
374 cifs_dbg(FYI, "found the last secondary response\n");
375 return 0;
376}
377
378static void
379cifs_downgrade_oplock(struct TCP_Server_Info *server,
380 struct cifsInodeInfo *cinode, bool set_level2)
381{
382 if (set_level2)
383 cifs_set_oplock_level(cinode, OPLOCK_READ);
384 else
385 cifs_set_oplock_level(cinode, 0);
386}
387
388static bool
389cifs_check_trans2(struct mid_q_entry *mid, struct TCP_Server_Info *server,
390 char *buf, int malformed)
391{
392 if (malformed)
393 return false;
394 if (check2ndT2(buf) <= 0)
395 return false;
396 mid->multiRsp = true;
397 if (mid->resp_buf) {
398 /* merge response - fix up 1st*/
399 malformed = coalesce_t2(buf, mid->resp_buf);
400 if (malformed > 0)
401 return true;
402 /* All parts received or packet is malformed. */
403 mid->multiEnd = true;
404 dequeue_mid(mid, malformed);
405 return true;
406 }
407 if (!server->large_buf) {
408 /*FIXME: switch to already allocated largebuf?*/
409 cifs_dbg(VFS, "1st trans2 resp needs bigbuf\n");
410 } else {
411 /* Have first buffer */
412 mid->resp_buf = buf;
413 mid->large_buf = true;
414 server->bigbuf = NULL;
415 }
416 return true;
417}
418
419static bool
420cifs_need_neg(struct TCP_Server_Info *server)
421{
422 return server->maxBuf == 0;
423}
424
425static int
426cifs_negotiate(const unsigned int xid, struct cifs_ses *ses)
427{
428 int rc;
429 rc = CIFSSMBNegotiate(xid, ses);
430 if (rc == -EAGAIN) {
431 /* retry only once on 1st time connection */
432 set_credits(ses->server, 1);
433 rc = CIFSSMBNegotiate(xid, ses);
434 if (rc == -EAGAIN)
435 rc = -EHOSTDOWN;
436 }
437 return rc;
438}
439
440static unsigned int
441cifs_negotiate_wsize(struct cifs_tcon *tcon, struct smb_vol *volume_info)
442{
443 __u64 unix_cap = le64_to_cpu(tcon->fsUnixInfo.Capability);
444 struct TCP_Server_Info *server = tcon->ses->server;
445 unsigned int wsize;
446
447 /* start with specified wsize, or default */
448 if (volume_info->wsize)
449 wsize = volume_info->wsize;
450 else if (tcon->unix_ext && (unix_cap & CIFS_UNIX_LARGE_WRITE_CAP))
451 wsize = CIFS_DEFAULT_IOSIZE;
452 else
453 wsize = CIFS_DEFAULT_NON_POSIX_WSIZE;
454
455 /* can server support 24-bit write sizes? (via UNIX extensions) */
456 if (!tcon->unix_ext || !(unix_cap & CIFS_UNIX_LARGE_WRITE_CAP))
457 wsize = min_t(unsigned int, wsize, CIFS_MAX_RFC1002_WSIZE);
458
459 /*
460 * no CAP_LARGE_WRITE_X or is signing enabled without CAP_UNIX set?
461 * Limit it to max buffer offered by the server, minus the size of the
462 * WRITEX header, not including the 4 byte RFC1001 length.
463 */
464 if (!(server->capabilities & CAP_LARGE_WRITE_X) ||
465 (!(server->capabilities & CAP_UNIX) && server->sign))
466 wsize = min_t(unsigned int, wsize,
467 server->maxBuf - sizeof(WRITE_REQ) + 4);
468
469 /* hard limit of CIFS_MAX_WSIZE */
470 wsize = min_t(unsigned int, wsize, CIFS_MAX_WSIZE);
471
472 return wsize;
473}
474
475static unsigned int
476cifs_negotiate_rsize(struct cifs_tcon *tcon, struct smb_vol *volume_info)
477{
478 __u64 unix_cap = le64_to_cpu(tcon->fsUnixInfo.Capability);
479 struct TCP_Server_Info *server = tcon->ses->server;
480 unsigned int rsize, defsize;
481
482 /*
483 * Set default value...
484 *
485 * HACK alert! Ancient servers have very small buffers. Even though
486 * MS-CIFS indicates that servers are only limited by the client's
487 * bufsize for reads, testing against win98se shows that it throws
488 * INVALID_PARAMETER errors if you try to request too large a read.
489 * OS/2 just sends back short reads.
490 *
491 * If the server doesn't advertise CAP_LARGE_READ_X, then assume that
492 * it can't handle a read request larger than its MaxBufferSize either.
493 */
494 if (tcon->unix_ext && (unix_cap & CIFS_UNIX_LARGE_READ_CAP))
495 defsize = CIFS_DEFAULT_IOSIZE;
496 else if (server->capabilities & CAP_LARGE_READ_X)
497 defsize = CIFS_DEFAULT_NON_POSIX_RSIZE;
498 else
499 defsize = server->maxBuf - sizeof(READ_RSP);
500
501 rsize = volume_info->rsize ? volume_info->rsize : defsize;
502
503 /*
504 * no CAP_LARGE_READ_X? Then MS-CIFS states that we must limit this to
505 * the client's MaxBufferSize.
506 */
507 if (!(server->capabilities & CAP_LARGE_READ_X))
508 rsize = min_t(unsigned int, CIFSMaxBufSize, rsize);
509
510 /* hard limit of CIFS_MAX_RSIZE */
511 rsize = min_t(unsigned int, rsize, CIFS_MAX_RSIZE);
512
513 return rsize;
514}
515
516static void
517cifs_qfs_tcon(const unsigned int xid, struct cifs_tcon *tcon)
518{
519 CIFSSMBQFSDeviceInfo(xid, tcon);
520 CIFSSMBQFSAttributeInfo(xid, tcon);
521}
522
523static int
524cifs_is_path_accessible(const unsigned int xid, struct cifs_tcon *tcon,
525 struct cifs_sb_info *cifs_sb, const char *full_path)
526{
527 int rc;
528 FILE_ALL_INFO *file_info;
529
530 file_info = kmalloc(sizeof(FILE_ALL_INFO), GFP_KERNEL);
531 if (file_info == NULL)
532 return -ENOMEM;
533
534 rc = CIFSSMBQPathInfo(xid, tcon, full_path, file_info,
535 0 /* not legacy */, cifs_sb->local_nls,
536 cifs_remap(cifs_sb));
537
538 if (rc == -EOPNOTSUPP || rc == -EINVAL)
539 rc = SMBQueryInformation(xid, tcon, full_path, file_info,
540 cifs_sb->local_nls, cifs_remap(cifs_sb));
541 kfree(file_info);
542 return rc;
543}
544
545static int
546cifs_query_path_info(const unsigned int xid, struct cifs_tcon *tcon,
547 struct cifs_sb_info *cifs_sb, const char *full_path,
548 FILE_ALL_INFO *data, bool *adjustTZ, bool *symlink)
549{
550 int rc;
551
552 *symlink = false;
553
554 /* could do find first instead but this returns more info */
555 rc = CIFSSMBQPathInfo(xid, tcon, full_path, data, 0 /* not legacy */,
556 cifs_sb->local_nls, cifs_remap(cifs_sb));
557 /*
558 * BB optimize code so we do not make the above call when server claims
559 * no NT SMB support and the above call failed at least once - set flag
560 * in tcon or mount.
561 */
562 if ((rc == -EOPNOTSUPP) || (rc == -EINVAL)) {
563 rc = SMBQueryInformation(xid, tcon, full_path, data,
564 cifs_sb->local_nls,
565 cifs_remap(cifs_sb));
566 *adjustTZ = true;
567 }
568
569 if (!rc && (le32_to_cpu(data->Attributes) & ATTR_REPARSE)) {
570 int tmprc;
571 int oplock = 0;
572 struct cifs_fid fid;
573 struct cifs_open_parms oparms;
574
575 oparms.tcon = tcon;
576 oparms.cifs_sb = cifs_sb;
577 oparms.desired_access = FILE_READ_ATTRIBUTES;
578 oparms.create_options = 0;
579 oparms.disposition = FILE_OPEN;
580 oparms.path = full_path;
581 oparms.fid = &fid;
582 oparms.reconnect = false;
583
584 /* Need to check if this is a symbolic link or not */
585 tmprc = CIFS_open(xid, &oparms, &oplock, NULL);
586 if (tmprc == -EOPNOTSUPP)
587 *symlink = true;
588 else if (tmprc == 0)
589 CIFSSMBClose(xid, tcon, fid.netfid);
590 }
591
592 return rc;
593}
594
595static int
596cifs_get_srv_inum(const unsigned int xid, struct cifs_tcon *tcon,
597 struct cifs_sb_info *cifs_sb, const char *full_path,
598 u64 *uniqueid, FILE_ALL_INFO *data)
599{
600 /*
601 * We can not use the IndexNumber field by default from Windows or
602 * Samba (in ALL_INFO buf) but we can request it explicitly. The SNIA
603 * CIFS spec claims that this value is unique within the scope of a
604 * share, and the windows docs hint that it's actually unique
605 * per-machine.
606 *
607 * There may be higher info levels that work but are there Windows
608 * server or network appliances for which IndexNumber field is not
609 * guaranteed unique?
610 */
611 return CIFSGetSrvInodeNumber(xid, tcon, full_path, uniqueid,
612 cifs_sb->local_nls,
613 cifs_remap(cifs_sb));
614}
615
616static int
617cifs_query_file_info(const unsigned int xid, struct cifs_tcon *tcon,
618 struct cifs_fid *fid, FILE_ALL_INFO *data)
619{
620 return CIFSSMBQFileInfo(xid, tcon, fid->netfid, data);
621}
622
623static void
624cifs_clear_stats(struct cifs_tcon *tcon)
625{
626#ifdef CONFIG_CIFS_STATS
627 atomic_set(&tcon->stats.cifs_stats.num_writes, 0);
628 atomic_set(&tcon->stats.cifs_stats.num_reads, 0);
629 atomic_set(&tcon->stats.cifs_stats.num_flushes, 0);
630 atomic_set(&tcon->stats.cifs_stats.num_oplock_brks, 0);
631 atomic_set(&tcon->stats.cifs_stats.num_opens, 0);
632 atomic_set(&tcon->stats.cifs_stats.num_posixopens, 0);
633 atomic_set(&tcon->stats.cifs_stats.num_posixmkdirs, 0);
634 atomic_set(&tcon->stats.cifs_stats.num_closes, 0);
635 atomic_set(&tcon->stats.cifs_stats.num_deletes, 0);
636 atomic_set(&tcon->stats.cifs_stats.num_mkdirs, 0);
637 atomic_set(&tcon->stats.cifs_stats.num_rmdirs, 0);
638 atomic_set(&tcon->stats.cifs_stats.num_renames, 0);
639 atomic_set(&tcon->stats.cifs_stats.num_t2renames, 0);
640 atomic_set(&tcon->stats.cifs_stats.num_ffirst, 0);
641 atomic_set(&tcon->stats.cifs_stats.num_fnext, 0);
642 atomic_set(&tcon->stats.cifs_stats.num_fclose, 0);
643 atomic_set(&tcon->stats.cifs_stats.num_hardlinks, 0);
644 atomic_set(&tcon->stats.cifs_stats.num_symlinks, 0);
645 atomic_set(&tcon->stats.cifs_stats.num_locks, 0);
646 atomic_set(&tcon->stats.cifs_stats.num_acl_get, 0);
647 atomic_set(&tcon->stats.cifs_stats.num_acl_set, 0);
648#endif
649}
650
651static void
652cifs_print_stats(struct seq_file *m, struct cifs_tcon *tcon)
653{
654#ifdef CONFIG_CIFS_STATS
655 seq_printf(m, " Oplocks breaks: %d",
656 atomic_read(&tcon->stats.cifs_stats.num_oplock_brks));
657 seq_printf(m, "\nReads: %d Bytes: %llu",
658 atomic_read(&tcon->stats.cifs_stats.num_reads),
659 (long long)(tcon->bytes_read));
660 seq_printf(m, "\nWrites: %d Bytes: %llu",
661 atomic_read(&tcon->stats.cifs_stats.num_writes),
662 (long long)(tcon->bytes_written));
663 seq_printf(m, "\nFlushes: %d",
664 atomic_read(&tcon->stats.cifs_stats.num_flushes));
665 seq_printf(m, "\nLocks: %d HardLinks: %d Symlinks: %d",
666 atomic_read(&tcon->stats.cifs_stats.num_locks),
667 atomic_read(&tcon->stats.cifs_stats.num_hardlinks),
668 atomic_read(&tcon->stats.cifs_stats.num_symlinks));
669 seq_printf(m, "\nOpens: %d Closes: %d Deletes: %d",
670 atomic_read(&tcon->stats.cifs_stats.num_opens),
671 atomic_read(&tcon->stats.cifs_stats.num_closes),
672 atomic_read(&tcon->stats.cifs_stats.num_deletes));
673 seq_printf(m, "\nPosix Opens: %d Posix Mkdirs: %d",
674 atomic_read(&tcon->stats.cifs_stats.num_posixopens),
675 atomic_read(&tcon->stats.cifs_stats.num_posixmkdirs));
676 seq_printf(m, "\nMkdirs: %d Rmdirs: %d",
677 atomic_read(&tcon->stats.cifs_stats.num_mkdirs),
678 atomic_read(&tcon->stats.cifs_stats.num_rmdirs));
679 seq_printf(m, "\nRenames: %d T2 Renames %d",
680 atomic_read(&tcon->stats.cifs_stats.num_renames),
681 atomic_read(&tcon->stats.cifs_stats.num_t2renames));
682 seq_printf(m, "\nFindFirst: %d FNext %d FClose %d",
683 atomic_read(&tcon->stats.cifs_stats.num_ffirst),
684 atomic_read(&tcon->stats.cifs_stats.num_fnext),
685 atomic_read(&tcon->stats.cifs_stats.num_fclose));
686#endif
687}
688
689static void
690cifs_mkdir_setinfo(struct inode *inode, const char *full_path,
691 struct cifs_sb_info *cifs_sb, struct cifs_tcon *tcon,
692 const unsigned int xid)
693{
694 FILE_BASIC_INFO info;
695 struct cifsInodeInfo *cifsInode;
696 u32 dosattrs;
697 int rc;
698
699 memset(&info, 0, sizeof(info));
700 cifsInode = CIFS_I(inode);
701 dosattrs = cifsInode->cifsAttrs|ATTR_READONLY;
702 info.Attributes = cpu_to_le32(dosattrs);
703 rc = CIFSSMBSetPathInfo(xid, tcon, full_path, &info, cifs_sb->local_nls,
704 cifs_remap(cifs_sb));
705 if (rc == 0)
706 cifsInode->cifsAttrs = dosattrs;
707}
708
709static int
710cifs_open_file(const unsigned int xid, struct cifs_open_parms *oparms,
711 __u32 *oplock, FILE_ALL_INFO *buf)
712{
713 if (!(oparms->tcon->ses->capabilities & CAP_NT_SMBS))
714 return SMBLegacyOpen(xid, oparms->tcon, oparms->path,
715 oparms->disposition,
716 oparms->desired_access,
717 oparms->create_options,
718 &oparms->fid->netfid, oplock, buf,
719 oparms->cifs_sb->local_nls,
720 cifs_remap(oparms->cifs_sb));
721 return CIFS_open(xid, oparms, oplock, buf);
722}
723
724static void
725cifs_set_fid(struct cifsFileInfo *cfile, struct cifs_fid *fid, __u32 oplock)
726{
727 struct cifsInodeInfo *cinode = CIFS_I(d_inode(cfile->dentry));
728 cfile->fid.netfid = fid->netfid;
729 cifs_set_oplock_level(cinode, oplock);
730 cinode->can_cache_brlcks = CIFS_CACHE_WRITE(cinode);
731}
732
733static void
734cifs_close_file(const unsigned int xid, struct cifs_tcon *tcon,
735 struct cifs_fid *fid)
736{
737 CIFSSMBClose(xid, tcon, fid->netfid);
738}
739
740static int
741cifs_flush_file(const unsigned int xid, struct cifs_tcon *tcon,
742 struct cifs_fid *fid)
743{
744 return CIFSSMBFlush(xid, tcon, fid->netfid);
745}
746
747static int
748cifs_sync_read(const unsigned int xid, struct cifs_fid *pfid,
749 struct cifs_io_parms *parms, unsigned int *bytes_read,
750 char **buf, int *buf_type)
751{
752 parms->netfid = pfid->netfid;
753 return CIFSSMBRead(xid, parms, bytes_read, buf, buf_type);
754}
755
756static int
757cifs_sync_write(const unsigned int xid, struct cifs_fid *pfid,
758 struct cifs_io_parms *parms, unsigned int *written,
759 struct kvec *iov, unsigned long nr_segs)
760{
761
762 parms->netfid = pfid->netfid;
763 return CIFSSMBWrite2(xid, parms, written, iov, nr_segs);
764}
765
766static int
767smb_set_file_info(struct inode *inode, const char *full_path,
768 FILE_BASIC_INFO *buf, const unsigned int xid)
769{
770 int oplock = 0;
771 int rc;
772 __u32 netpid;
773 struct cifs_fid fid;
774 struct cifs_open_parms oparms;
775 struct cifsFileInfo *open_file;
776 struct cifsInodeInfo *cinode = CIFS_I(inode);
777 struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
778 struct tcon_link *tlink = NULL;
779 struct cifs_tcon *tcon;
780
781 /* if the file is already open for write, just use that fileid */
782 open_file = find_writable_file(cinode, true);
783 if (open_file) {
784 fid.netfid = open_file->fid.netfid;
785 netpid = open_file->pid;
786 tcon = tlink_tcon(open_file->tlink);
787 goto set_via_filehandle;
788 }
789
790 tlink = cifs_sb_tlink(cifs_sb);
791 if (IS_ERR(tlink)) {
792 rc = PTR_ERR(tlink);
793 tlink = NULL;
794 goto out;
795 }
796 tcon = tlink_tcon(tlink);
797
798 rc = CIFSSMBSetPathInfo(xid, tcon, full_path, buf, cifs_sb->local_nls,
799 cifs_remap(cifs_sb));
800 if (rc == 0) {
801 cinode->cifsAttrs = le32_to_cpu(buf->Attributes);
802 goto out;
803 } else if (rc != -EOPNOTSUPP && rc != -EINVAL) {
804 goto out;
805 }
806
807 oparms.tcon = tcon;
808 oparms.cifs_sb = cifs_sb;
809 oparms.desired_access = SYNCHRONIZE | FILE_WRITE_ATTRIBUTES;
810 oparms.create_options = CREATE_NOT_DIR;
811 oparms.disposition = FILE_OPEN;
812 oparms.path = full_path;
813 oparms.fid = &fid;
814 oparms.reconnect = false;
815
816 cifs_dbg(FYI, "calling SetFileInfo since SetPathInfo for times not supported by this server\n");
817 rc = CIFS_open(xid, &oparms, &oplock, NULL);
818 if (rc != 0) {
819 if (rc == -EIO)
820 rc = -EINVAL;
821 goto out;
822 }
823
824 netpid = current->tgid;
825
826set_via_filehandle:
827 rc = CIFSSMBSetFileInfo(xid, tcon, buf, fid.netfid, netpid);
828 if (!rc)
829 cinode->cifsAttrs = le32_to_cpu(buf->Attributes);
830
831 if (open_file == NULL)
832 CIFSSMBClose(xid, tcon, fid.netfid);
833 else
834 cifsFileInfo_put(open_file);
835out:
836 if (tlink != NULL)
837 cifs_put_tlink(tlink);
838 return rc;
839}
840
841static int
842cifs_set_compression(const unsigned int xid, struct cifs_tcon *tcon,
843 struct cifsFileInfo *cfile)
844{
845 return CIFSSMB_set_compression(xid, tcon, cfile->fid.netfid);
846}
847
848static int
849cifs_query_dir_first(const unsigned int xid, struct cifs_tcon *tcon,
850 const char *path, struct cifs_sb_info *cifs_sb,
851 struct cifs_fid *fid, __u16 search_flags,
852 struct cifs_search_info *srch_inf)
853{
854 int rc;
855
856 rc = CIFSFindFirst(xid, tcon, path, cifs_sb,
857 &fid->netfid, search_flags, srch_inf, true);
858 if (rc)
859 cifs_dbg(FYI, "find first failed=%d\n", rc);
860 return rc;
861}
862
863static int
864cifs_query_dir_next(const unsigned int xid, struct cifs_tcon *tcon,
865 struct cifs_fid *fid, __u16 search_flags,
866 struct cifs_search_info *srch_inf)
867{
868 return CIFSFindNext(xid, tcon, fid->netfid, search_flags, srch_inf);
869}
870
871static int
872cifs_close_dir(const unsigned int xid, struct cifs_tcon *tcon,
873 struct cifs_fid *fid)
874{
875 return CIFSFindClose(xid, tcon, fid->netfid);
876}
877
878static int
879cifs_oplock_response(struct cifs_tcon *tcon, struct cifs_fid *fid,
880 struct cifsInodeInfo *cinode)
881{
882 return CIFSSMBLock(0, tcon, fid->netfid, current->tgid, 0, 0, 0, 0,
883 LOCKING_ANDX_OPLOCK_RELEASE, false,
884 CIFS_CACHE_READ(cinode) ? 1 : 0);
885}
886
887static int
888cifs_queryfs(const unsigned int xid, struct cifs_tcon *tcon,
889 struct kstatfs *buf)
890{
891 int rc = -EOPNOTSUPP;
892
893 buf->f_type = CIFS_MAGIC_NUMBER;
894
895 /*
896 * We could add a second check for a QFS Unix capability bit
897 */
898 if ((tcon->ses->capabilities & CAP_UNIX) &&
899 (CIFS_POSIX_EXTENSIONS & le64_to_cpu(tcon->fsUnixInfo.Capability)))
900 rc = CIFSSMBQFSPosixInfo(xid, tcon, buf);
901
902 /*
903 * Only need to call the old QFSInfo if failed on newer one,
904 * e.g. by OS/2.
905 **/
906 if (rc && (tcon->ses->capabilities & CAP_NT_SMBS))
907 rc = CIFSSMBQFSInfo(xid, tcon, buf);
908
909 /*
910 * Some old Windows servers also do not support level 103, retry with
911 * older level one if old server failed the previous call or we
912 * bypassed it because we detected that this was an older LANMAN sess
913 */
914 if (rc)
915 rc = SMBOldQFSInfo(xid, tcon, buf);
916 return rc;
917}
918
919static int
920cifs_mand_lock(const unsigned int xid, struct cifsFileInfo *cfile, __u64 offset,
921 __u64 length, __u32 type, int lock, int unlock, bool wait)
922{
923 return CIFSSMBLock(xid, tlink_tcon(cfile->tlink), cfile->fid.netfid,
924 current->tgid, length, offset, unlock, lock,
925 (__u8)type, wait, 0);
926}
927
928static int
929cifs_unix_dfs_readlink(const unsigned int xid, struct cifs_tcon *tcon,
930 const unsigned char *searchName, char **symlinkinfo,
931 const struct nls_table *nls_codepage)
932{
933#ifdef CONFIG_CIFS_DFS_UPCALL
934 int rc;
935 unsigned int num_referrals = 0;
936 struct dfs_info3_param *referrals = NULL;
937
938 rc = get_dfs_path(xid, tcon->ses, searchName, nls_codepage,
939 &num_referrals, &referrals, 0);
940
941 if (!rc && num_referrals > 0) {
942 *symlinkinfo = kstrndup(referrals->node_name,
943 strlen(referrals->node_name),
944 GFP_KERNEL);
945 if (!*symlinkinfo)
946 rc = -ENOMEM;
947 free_dfs_info_array(referrals, num_referrals);
948 }
949 return rc;
950#else /* No DFS support */
951 return -EREMOTE;
952#endif
953}
954
955static int
956cifs_query_symlink(const unsigned int xid, struct cifs_tcon *tcon,
957 const char *full_path, char **target_path,
958 struct cifs_sb_info *cifs_sb)
959{
960 int rc;
961 int oplock = 0;
962 struct cifs_fid fid;
963 struct cifs_open_parms oparms;
964
965 cifs_dbg(FYI, "%s: path: %s\n", __func__, full_path);
966
967 /* Check for unix extensions */
968 if (cap_unix(tcon->ses)) {
969 rc = CIFSSMBUnixQuerySymLink(xid, tcon, full_path, target_path,
970 cifs_sb->local_nls,
971 cifs_remap(cifs_sb));
972 if (rc == -EREMOTE)
973 rc = cifs_unix_dfs_readlink(xid, tcon, full_path,
974 target_path,
975 cifs_sb->local_nls);
976
977 goto out;
978 }
979
980 oparms.tcon = tcon;
981 oparms.cifs_sb = cifs_sb;
982 oparms.desired_access = FILE_READ_ATTRIBUTES;
983 oparms.create_options = OPEN_REPARSE_POINT;
984 oparms.disposition = FILE_OPEN;
985 oparms.path = full_path;
986 oparms.fid = &fid;
987 oparms.reconnect = false;
988
989 rc = CIFS_open(xid, &oparms, &oplock, NULL);
990 if (rc)
991 goto out;
992
993 rc = CIFSSMBQuerySymLink(xid, tcon, fid.netfid, target_path,
994 cifs_sb->local_nls);
995 if (rc)
996 goto out_close;
997
998 convert_delimiter(*target_path, '/');
999out_close:
1000 CIFSSMBClose(xid, tcon, fid.netfid);
1001out:
1002 if (!rc)
1003 cifs_dbg(FYI, "%s: target path: %s\n", __func__, *target_path);
1004 return rc;
1005}
1006
1007static bool
1008cifs_is_read_op(__u32 oplock)
1009{
1010 return oplock == OPLOCK_READ;
1011}
1012
1013static unsigned int
1014cifs_wp_retry_size(struct inode *inode)
1015{
1016 return CIFS_SB(inode->i_sb)->wsize;
1017}
1018
1019static bool
1020cifs_dir_needs_close(struct cifsFileInfo *cfile)
1021{
1022 return !cfile->srch_inf.endOfSearch && !cfile->invalidHandle;
1023}
1024
1025static bool
1026cifs_can_echo(struct TCP_Server_Info *server)
1027{
1028 if (server->tcpStatus == CifsGood)
1029 return true;
1030
1031 return false;
1032}
1033
1034struct smb_version_operations smb1_operations = {
1035 .send_cancel = send_nt_cancel,
1036 .compare_fids = cifs_compare_fids,
1037 .setup_request = cifs_setup_request,
1038 .setup_async_request = cifs_setup_async_request,
1039 .check_receive = cifs_check_receive,
1040 .add_credits = cifs_add_credits,
1041 .set_credits = cifs_set_credits,
1042 .get_credits_field = cifs_get_credits_field,
1043 .get_credits = cifs_get_credits,
1044 .wait_mtu_credits = cifs_wait_mtu_credits,
1045 .get_next_mid = cifs_get_next_mid,
1046 .read_data_offset = cifs_read_data_offset,
1047 .read_data_length = cifs_read_data_length,
1048 .map_error = map_smb_to_linux_error,
1049 .find_mid = cifs_find_mid,
1050 .check_message = checkSMB,
1051 .dump_detail = cifs_dump_detail,
1052 .clear_stats = cifs_clear_stats,
1053 .print_stats = cifs_print_stats,
1054 .is_oplock_break = is_valid_oplock_break,
1055 .downgrade_oplock = cifs_downgrade_oplock,
1056 .check_trans2 = cifs_check_trans2,
1057 .need_neg = cifs_need_neg,
1058 .negotiate = cifs_negotiate,
1059 .negotiate_wsize = cifs_negotiate_wsize,
1060 .negotiate_rsize = cifs_negotiate_rsize,
1061 .sess_setup = CIFS_SessSetup,
1062 .logoff = CIFSSMBLogoff,
1063 .tree_connect = CIFSTCon,
1064 .tree_disconnect = CIFSSMBTDis,
1065 .get_dfs_refer = CIFSGetDFSRefer,
1066 .qfs_tcon = cifs_qfs_tcon,
1067 .is_path_accessible = cifs_is_path_accessible,
1068 .can_echo = cifs_can_echo,
1069 .query_path_info = cifs_query_path_info,
1070 .query_file_info = cifs_query_file_info,
1071 .get_srv_inum = cifs_get_srv_inum,
1072 .set_path_size = CIFSSMBSetEOF,
1073 .set_file_size = CIFSSMBSetFileSize,
1074 .set_file_info = smb_set_file_info,
1075 .set_compression = cifs_set_compression,
1076 .echo = CIFSSMBEcho,
1077 .mkdir = CIFSSMBMkDir,
1078 .mkdir_setinfo = cifs_mkdir_setinfo,
1079 .rmdir = CIFSSMBRmDir,
1080 .unlink = CIFSSMBDelFile,
1081 .rename_pending_delete = cifs_rename_pending_delete,
1082 .rename = CIFSSMBRename,
1083 .create_hardlink = CIFSCreateHardLink,
1084 .query_symlink = cifs_query_symlink,
1085 .open = cifs_open_file,
1086 .set_fid = cifs_set_fid,
1087 .close = cifs_close_file,
1088 .flush = cifs_flush_file,
1089 .async_readv = cifs_async_readv,
1090 .async_writev = cifs_async_writev,
1091 .sync_read = cifs_sync_read,
1092 .sync_write = cifs_sync_write,
1093 .query_dir_first = cifs_query_dir_first,
1094 .query_dir_next = cifs_query_dir_next,
1095 .close_dir = cifs_close_dir,
1096 .calc_smb_size = smbCalcSize,
1097 .oplock_response = cifs_oplock_response,
1098 .queryfs = cifs_queryfs,
1099 .mand_lock = cifs_mand_lock,
1100 .mand_unlock_range = cifs_unlock_range,
1101 .push_mand_locks = cifs_push_mandatory_locks,
1102 .query_mf_symlink = cifs_query_mf_symlink,
1103 .create_mf_symlink = cifs_create_mf_symlink,
1104 .is_read_op = cifs_is_read_op,
1105 .wp_retry_size = cifs_wp_retry_size,
1106 .dir_needs_close = cifs_dir_needs_close,
1107 .select_sectype = cifs_select_sectype,
1108#ifdef CONFIG_CIFS_XATTR
1109 .query_all_EAs = CIFSSMBQAllEAs,
1110 .set_EA = CIFSSMBSetEA,
1111#endif /* CIFS_XATTR */
1112#ifdef CONFIG_CIFS_ACL
1113 .get_acl = get_cifs_acl,
1114 .get_acl_by_fid = get_cifs_acl_by_fid,
1115 .set_acl = set_cifs_acl,
1116#endif /* CIFS_ACL */
1117};
1118
1119struct smb_version_values smb1_values = {
1120 .version_string = SMB1_VERSION_STRING,
1121 .large_lock_type = LOCKING_ANDX_LARGE_FILES,
1122 .exclusive_lock_type = 0,
1123 .shared_lock_type = LOCKING_ANDX_SHARED_LOCK,
1124 .unlock_lock_type = 0,
1125 .header_preamble_size = 4,
1126 .header_size = sizeof(struct smb_hdr),
1127 .max_header_size = MAX_CIFS_HDR_SIZE,
1128 .read_rsp_size = sizeof(READ_RSP),
1129 .lock_cmd = cpu_to_le16(SMB_COM_LOCKING_ANDX),
1130 .cap_unix = CAP_UNIX,
1131 .cap_nt_find = CAP_NT_SMBS | CAP_NT_FIND,
1132 .cap_large_files = CAP_LARGE_FILES,
1133 .signing_enabled = SECMODE_SIGN_ENABLED,
1134 .signing_required = SECMODE_SIGN_REQUIRED,
1135};