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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
27/*
28 * An NT cancel request header looks just like the original request except:
29 *
30 * The Command is SMB_COM_NT_CANCEL
31 * The WordCount is zeroed out
32 * The ByteCount is zeroed out
33 *
34 * This function mangles an existing request buffer into a
35 * SMB_COM_NT_CANCEL request and then sends it.
36 */
37static int
38send_nt_cancel(struct TCP_Server_Info *server, void *buf,
39 struct mid_q_entry *mid)
40{
41 int rc = 0;
42 struct smb_hdr *in_buf = (struct smb_hdr *)buf;
43
44 /* -4 for RFC1001 length and +2 for BCC field */
45 in_buf->smb_buf_length = cpu_to_be32(sizeof(struct smb_hdr) - 4 + 2);
46 in_buf->Command = SMB_COM_NT_CANCEL;
47 in_buf->WordCount = 0;
48 put_bcc(0, in_buf);
49
50 mutex_lock(&server->srv_mutex);
51 rc = cifs_sign_smb(in_buf, server, &mid->sequence_number);
52 if (rc) {
53 mutex_unlock(&server->srv_mutex);
54 return rc;
55 }
56
57 /*
58 * The response to this call was already factored into the sequence
59 * number when the call went out, so we must adjust it back downward
60 * after signing here.
61 */
62 --server->sequence_number;
63 rc = smb_send(server, in_buf, be32_to_cpu(in_buf->smb_buf_length));
64 if (rc < 0)
65 server->sequence_number--;
66
67 mutex_unlock(&server->srv_mutex);
68
69 cifs_dbg(FYI, "issued NT_CANCEL for mid %u, rc = %d\n",
70 get_mid(in_buf), rc);
71
72 return rc;
73}
74
75static bool
76cifs_compare_fids(struct cifsFileInfo *ob1, struct cifsFileInfo *ob2)
77{
78 return ob1->fid.netfid == ob2->fid.netfid;
79}
80
81static unsigned int
82cifs_read_data_offset(char *buf)
83{
84 READ_RSP *rsp = (READ_RSP *)buf;
85 return le16_to_cpu(rsp->DataOffset);
86}
87
88static unsigned int
89cifs_read_data_length(char *buf)
90{
91 READ_RSP *rsp = (READ_RSP *)buf;
92 return (le16_to_cpu(rsp->DataLengthHigh) << 16) +
93 le16_to_cpu(rsp->DataLength);
94}
95
96static struct mid_q_entry *
97cifs_find_mid(struct TCP_Server_Info *server, char *buffer)
98{
99 struct smb_hdr *buf = (struct smb_hdr *)buffer;
100 struct mid_q_entry *mid;
101
102 spin_lock(&GlobalMid_Lock);
103 list_for_each_entry(mid, &server->pending_mid_q, qhead) {
104 if (compare_mid(mid->mid, buf) &&
105 mid->mid_state == MID_REQUEST_SUBMITTED &&
106 le16_to_cpu(mid->command) == buf->Command) {
107 spin_unlock(&GlobalMid_Lock);
108 return mid;
109 }
110 }
111 spin_unlock(&GlobalMid_Lock);
112 return NULL;
113}
114
115static void
116cifs_add_credits(struct TCP_Server_Info *server, const unsigned int add,
117 const int optype)
118{
119 spin_lock(&server->req_lock);
120 server->credits += add;
121 server->in_flight--;
122 spin_unlock(&server->req_lock);
123 wake_up(&server->request_q);
124}
125
126static void
127cifs_set_credits(struct TCP_Server_Info *server, const int val)
128{
129 spin_lock(&server->req_lock);
130 server->credits = val;
131 server->oplocks = val > 1 ? enable_oplocks : false;
132 spin_unlock(&server->req_lock);
133}
134
135static int *
136cifs_get_credits_field(struct TCP_Server_Info *server, const int optype)
137{
138 return &server->credits;
139}
140
141static unsigned int
142cifs_get_credits(struct mid_q_entry *mid)
143{
144 return 1;
145}
146
147/*
148 * Find a free multiplex id (SMB mid). Otherwise there could be
149 * mid collisions which might cause problems, demultiplexing the
150 * wrong response to this request. Multiplex ids could collide if
151 * one of a series requests takes much longer than the others, or
152 * if a very large number of long lived requests (byte range
153 * locks or FindNotify requests) are pending. No more than
154 * 64K-1 requests can be outstanding at one time. If no
155 * mids are available, return zero. A future optimization
156 * could make the combination of mids and uid the key we use
157 * to demultiplex on (rather than mid alone).
158 * In addition to the above check, the cifs demultiplex
159 * code already used the command code as a secondary
160 * check of the frame and if signing is negotiated the
161 * response would be discarded if the mid were the same
162 * but the signature was wrong. Since the mid is not put in the
163 * pending queue until later (when it is about to be dispatched)
164 * we do have to limit the number of outstanding requests
165 * to somewhat less than 64K-1 although it is hard to imagine
166 * so many threads being in the vfs at one time.
167 */
168static __u64
169cifs_get_next_mid(struct TCP_Server_Info *server)
170{
171 __u64 mid = 0;
172 __u16 last_mid, cur_mid;
173 bool collision;
174
175 spin_lock(&GlobalMid_Lock);
176
177 /* mid is 16 bit only for CIFS/SMB */
178 cur_mid = (__u16)((server->CurrentMid) & 0xffff);
179 /* we do not want to loop forever */
180 last_mid = cur_mid;
181 cur_mid++;
182
183 /*
184 * This nested loop looks more expensive than it is.
185 * In practice the list of pending requests is short,
186 * fewer than 50, and the mids are likely to be unique
187 * on the first pass through the loop unless some request
188 * takes longer than the 64 thousand requests before it
189 * (and it would also have to have been a request that
190 * did not time out).
191 */
192 while (cur_mid != last_mid) {
193 struct mid_q_entry *mid_entry;
194 unsigned int num_mids;
195
196 collision = false;
197 if (cur_mid == 0)
198 cur_mid++;
199
200 num_mids = 0;
201 list_for_each_entry(mid_entry, &server->pending_mid_q, qhead) {
202 ++num_mids;
203 if (mid_entry->mid == cur_mid &&
204 mid_entry->mid_state == MID_REQUEST_SUBMITTED) {
205 /* This mid is in use, try a different one */
206 collision = true;
207 break;
208 }
209 }
210
211 /*
212 * if we have more than 32k mids in the list, then something
213 * is very wrong. Possibly a local user is trying to DoS the
214 * box by issuing long-running calls and SIGKILL'ing them. If
215 * we get to 2^16 mids then we're in big trouble as this
216 * function could loop forever.
217 *
218 * Go ahead and assign out the mid in this situation, but force
219 * an eventual reconnect to clean out the pending_mid_q.
220 */
221 if (num_mids > 32768)
222 server->tcpStatus = CifsNeedReconnect;
223
224 if (!collision) {
225 mid = (__u64)cur_mid;
226 server->CurrentMid = mid;
227 break;
228 }
229 cur_mid++;
230 }
231 spin_unlock(&GlobalMid_Lock);
232 return mid;
233}
234
235/*
236 return codes:
237 0 not a transact2, or all data present
238 >0 transact2 with that much data missing
239 -EINVAL invalid transact2
240 */
241static int
242check2ndT2(char *buf)
243{
244 struct smb_hdr *pSMB = (struct smb_hdr *)buf;
245 struct smb_t2_rsp *pSMBt;
246 int remaining;
247 __u16 total_data_size, data_in_this_rsp;
248
249 if (pSMB->Command != SMB_COM_TRANSACTION2)
250 return 0;
251
252 /* check for plausible wct, bcc and t2 data and parm sizes */
253 /* check for parm and data offset going beyond end of smb */
254 if (pSMB->WordCount != 10) { /* coalesce_t2 depends on this */
255 cifs_dbg(FYI, "invalid transact2 word count\n");
256 return -EINVAL;
257 }
258
259 pSMBt = (struct smb_t2_rsp *)pSMB;
260
261 total_data_size = get_unaligned_le16(&pSMBt->t2_rsp.TotalDataCount);
262 data_in_this_rsp = get_unaligned_le16(&pSMBt->t2_rsp.DataCount);
263
264 if (total_data_size == data_in_this_rsp)
265 return 0;
266 else if (total_data_size < data_in_this_rsp) {
267 cifs_dbg(FYI, "total data %d smaller than data in frame %d\n",
268 total_data_size, data_in_this_rsp);
269 return -EINVAL;
270 }
271
272 remaining = total_data_size - data_in_this_rsp;
273
274 cifs_dbg(FYI, "missing %d bytes from transact2, check next response\n",
275 remaining);
276 if (total_data_size > CIFSMaxBufSize) {
277 cifs_dbg(VFS, "TotalDataSize %d is over maximum buffer %d\n",
278 total_data_size, CIFSMaxBufSize);
279 return -EINVAL;
280 }
281 return remaining;
282}
283
284static int
285coalesce_t2(char *second_buf, struct smb_hdr *target_hdr)
286{
287 struct smb_t2_rsp *pSMBs = (struct smb_t2_rsp *)second_buf;
288 struct smb_t2_rsp *pSMBt = (struct smb_t2_rsp *)target_hdr;
289 char *data_area_of_tgt;
290 char *data_area_of_src;
291 int remaining;
292 unsigned int byte_count, total_in_tgt;
293 __u16 tgt_total_cnt, src_total_cnt, total_in_src;
294
295 src_total_cnt = get_unaligned_le16(&pSMBs->t2_rsp.TotalDataCount);
296 tgt_total_cnt = get_unaligned_le16(&pSMBt->t2_rsp.TotalDataCount);
297
298 if (tgt_total_cnt != src_total_cnt)
299 cifs_dbg(FYI, "total data count of primary and secondary t2 differ source=%hu target=%hu\n",
300 src_total_cnt, tgt_total_cnt);
301
302 total_in_tgt = get_unaligned_le16(&pSMBt->t2_rsp.DataCount);
303
304 remaining = tgt_total_cnt - total_in_tgt;
305
306 if (remaining < 0) {
307 cifs_dbg(FYI, "Server sent too much data. tgt_total_cnt=%hu total_in_tgt=%hu\n",
308 tgt_total_cnt, total_in_tgt);
309 return -EPROTO;
310 }
311
312 if (remaining == 0) {
313 /* nothing to do, ignore */
314 cifs_dbg(FYI, "no more data remains\n");
315 return 0;
316 }
317
318 total_in_src = get_unaligned_le16(&pSMBs->t2_rsp.DataCount);
319 if (remaining < total_in_src)
320 cifs_dbg(FYI, "transact2 2nd response contains too much data\n");
321
322 /* find end of first SMB data area */
323 data_area_of_tgt = (char *)&pSMBt->hdr.Protocol +
324 get_unaligned_le16(&pSMBt->t2_rsp.DataOffset);
325
326 /* validate target area */
327 data_area_of_src = (char *)&pSMBs->hdr.Protocol +
328 get_unaligned_le16(&pSMBs->t2_rsp.DataOffset);
329
330 data_area_of_tgt += total_in_tgt;
331
332 total_in_tgt += total_in_src;
333 /* is the result too big for the field? */
334 if (total_in_tgt > USHRT_MAX) {
335 cifs_dbg(FYI, "coalesced DataCount too large (%u)\n",
336 total_in_tgt);
337 return -EPROTO;
338 }
339 put_unaligned_le16(total_in_tgt, &pSMBt->t2_rsp.DataCount);
340
341 /* fix up the BCC */
342 byte_count = get_bcc(target_hdr);
343 byte_count += total_in_src;
344 /* is the result too big for the field? */
345 if (byte_count > USHRT_MAX) {
346 cifs_dbg(FYI, "coalesced BCC too large (%u)\n", byte_count);
347 return -EPROTO;
348 }
349 put_bcc(byte_count, target_hdr);
350
351 byte_count = be32_to_cpu(target_hdr->smb_buf_length);
352 byte_count += total_in_src;
353 /* don't allow buffer to overflow */
354 if (byte_count > CIFSMaxBufSize + MAX_CIFS_HDR_SIZE - 4) {
355 cifs_dbg(FYI, "coalesced BCC exceeds buffer size (%u)\n",
356 byte_count);
357 return -ENOBUFS;
358 }
359 target_hdr->smb_buf_length = cpu_to_be32(byte_count);
360
361 /* copy second buffer into end of first buffer */
362 memcpy(data_area_of_tgt, data_area_of_src, total_in_src);
363
364 if (remaining != total_in_src) {
365 /* more responses to go */
366 cifs_dbg(FYI, "waiting for more secondary responses\n");
367 return 1;
368 }
369
370 /* we are done */
371 cifs_dbg(FYI, "found the last secondary response\n");
372 return 0;
373}
374
375static void
376cifs_downgrade_oplock(struct TCP_Server_Info *server,
377 struct cifsInodeInfo *cinode, bool set_level2)
378{
379 if (set_level2)
380 cifs_set_oplock_level(cinode, OPLOCK_READ);
381 else
382 cifs_set_oplock_level(cinode, 0);
383}
384
385static bool
386cifs_check_trans2(struct mid_q_entry *mid, struct TCP_Server_Info *server,
387 char *buf, int malformed)
388{
389 if (malformed)
390 return false;
391 if (check2ndT2(buf) <= 0)
392 return false;
393 mid->multiRsp = true;
394 if (mid->resp_buf) {
395 /* merge response - fix up 1st*/
396 malformed = coalesce_t2(buf, mid->resp_buf);
397 if (malformed > 0)
398 return true;
399 /* All parts received or packet is malformed. */
400 mid->multiEnd = true;
401 dequeue_mid(mid, malformed);
402 return true;
403 }
404 if (!server->large_buf) {
405 /*FIXME: switch to already allocated largebuf?*/
406 cifs_dbg(VFS, "1st trans2 resp needs bigbuf\n");
407 } else {
408 /* Have first buffer */
409 mid->resp_buf = buf;
410 mid->large_buf = true;
411 server->bigbuf = NULL;
412 }
413 return true;
414}
415
416static bool
417cifs_need_neg(struct TCP_Server_Info *server)
418{
419 return server->maxBuf == 0;
420}
421
422static int
423cifs_negotiate(const unsigned int xid, struct cifs_ses *ses)
424{
425 int rc;
426 rc = CIFSSMBNegotiate(xid, ses);
427 if (rc == -EAGAIN) {
428 /* retry only once on 1st time connection */
429 set_credits(ses->server, 1);
430 rc = CIFSSMBNegotiate(xid, ses);
431 if (rc == -EAGAIN)
432 rc = -EHOSTDOWN;
433 }
434 return rc;
435}
436
437static unsigned int
438cifs_negotiate_wsize(struct cifs_tcon *tcon, struct smb_vol *volume_info)
439{
440 __u64 unix_cap = le64_to_cpu(tcon->fsUnixInfo.Capability);
441 struct TCP_Server_Info *server = tcon->ses->server;
442 unsigned int wsize;
443
444 /* start with specified wsize, or default */
445 if (volume_info->wsize)
446 wsize = volume_info->wsize;
447 else if (tcon->unix_ext && (unix_cap & CIFS_UNIX_LARGE_WRITE_CAP))
448 wsize = CIFS_DEFAULT_IOSIZE;
449 else
450 wsize = CIFS_DEFAULT_NON_POSIX_WSIZE;
451
452 /* can server support 24-bit write sizes? (via UNIX extensions) */
453 if (!tcon->unix_ext || !(unix_cap & CIFS_UNIX_LARGE_WRITE_CAP))
454 wsize = min_t(unsigned int, wsize, CIFS_MAX_RFC1002_WSIZE);
455
456 /*
457 * no CAP_LARGE_WRITE_X or is signing enabled without CAP_UNIX set?
458 * Limit it to max buffer offered by the server, minus the size of the
459 * WRITEX header, not including the 4 byte RFC1001 length.
460 */
461 if (!(server->capabilities & CAP_LARGE_WRITE_X) ||
462 (!(server->capabilities & CAP_UNIX) && server->sign))
463 wsize = min_t(unsigned int, wsize,
464 server->maxBuf - sizeof(WRITE_REQ) + 4);
465
466 /* hard limit of CIFS_MAX_WSIZE */
467 wsize = min_t(unsigned int, wsize, CIFS_MAX_WSIZE);
468
469 return wsize;
470}
471
472static unsigned int
473cifs_negotiate_rsize(struct cifs_tcon *tcon, struct smb_vol *volume_info)
474{
475 __u64 unix_cap = le64_to_cpu(tcon->fsUnixInfo.Capability);
476 struct TCP_Server_Info *server = tcon->ses->server;
477 unsigned int rsize, defsize;
478
479 /*
480 * Set default value...
481 *
482 * HACK alert! Ancient servers have very small buffers. Even though
483 * MS-CIFS indicates that servers are only limited by the client's
484 * bufsize for reads, testing against win98se shows that it throws
485 * INVALID_PARAMETER errors if you try to request too large a read.
486 * OS/2 just sends back short reads.
487 *
488 * If the server doesn't advertise CAP_LARGE_READ_X, then assume that
489 * it can't handle a read request larger than its MaxBufferSize either.
490 */
491 if (tcon->unix_ext && (unix_cap & CIFS_UNIX_LARGE_READ_CAP))
492 defsize = CIFS_DEFAULT_IOSIZE;
493 else if (server->capabilities & CAP_LARGE_READ_X)
494 defsize = CIFS_DEFAULT_NON_POSIX_RSIZE;
495 else
496 defsize = server->maxBuf - sizeof(READ_RSP);
497
498 rsize = volume_info->rsize ? volume_info->rsize : defsize;
499
500 /*
501 * no CAP_LARGE_READ_X? Then MS-CIFS states that we must limit this to
502 * the client's MaxBufferSize.
503 */
504 if (!(server->capabilities & CAP_LARGE_READ_X))
505 rsize = min_t(unsigned int, CIFSMaxBufSize, rsize);
506
507 /* hard limit of CIFS_MAX_RSIZE */
508 rsize = min_t(unsigned int, rsize, CIFS_MAX_RSIZE);
509
510 return rsize;
511}
512
513static void
514cifs_qfs_tcon(const unsigned int xid, struct cifs_tcon *tcon)
515{
516 CIFSSMBQFSDeviceInfo(xid, tcon);
517 CIFSSMBQFSAttributeInfo(xid, tcon);
518}
519
520static int
521cifs_is_path_accessible(const unsigned int xid, struct cifs_tcon *tcon,
522 struct cifs_sb_info *cifs_sb, const char *full_path)
523{
524 int rc;
525 FILE_ALL_INFO *file_info;
526
527 file_info = kmalloc(sizeof(FILE_ALL_INFO), GFP_KERNEL);
528 if (file_info == NULL)
529 return -ENOMEM;
530
531 rc = CIFSSMBQPathInfo(xid, tcon, full_path, file_info,
532 0 /* not legacy */, cifs_sb->local_nls,
533 cifs_sb->mnt_cifs_flags &
534 CIFS_MOUNT_MAP_SPECIAL_CHR);
535
536 if (rc == -EOPNOTSUPP || rc == -EINVAL)
537 rc = SMBQueryInformation(xid, tcon, full_path, file_info,
538 cifs_sb->local_nls, cifs_sb->mnt_cifs_flags &
539 CIFS_MOUNT_MAP_SPECIAL_CHR);
540 kfree(file_info);
541 return rc;
542}
543
544static int
545cifs_query_path_info(const unsigned int xid, struct cifs_tcon *tcon,
546 struct cifs_sb_info *cifs_sb, const char *full_path,
547 FILE_ALL_INFO *data, bool *adjustTZ, bool *symlink)
548{
549 int rc;
550
551 *symlink = false;
552
553 /* could do find first instead but this returns more info */
554 rc = CIFSSMBQPathInfo(xid, tcon, full_path, data, 0 /* not legacy */,
555 cifs_sb->local_nls, cifs_sb->mnt_cifs_flags &
556 CIFS_MOUNT_MAP_SPECIAL_CHR);
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_sb->mnt_cifs_flags &
566 CIFS_MOUNT_MAP_SPECIAL_CHR);
567 *adjustTZ = true;
568 }
569
570 if (!rc && (le32_to_cpu(data->Attributes) & ATTR_REPARSE)) {
571 int tmprc;
572 int oplock = 0;
573 struct cifs_fid fid;
574 struct cifs_open_parms oparms;
575
576 oparms.tcon = tcon;
577 oparms.cifs_sb = cifs_sb;
578 oparms.desired_access = FILE_READ_ATTRIBUTES;
579 oparms.create_options = 0;
580 oparms.disposition = FILE_OPEN;
581 oparms.path = full_path;
582 oparms.fid = &fid;
583 oparms.reconnect = false;
584
585 /* Need to check if this is a symbolic link or not */
586 tmprc = CIFS_open(xid, &oparms, &oplock, NULL);
587 if (tmprc == -EOPNOTSUPP)
588 *symlink = true;
589 else
590 CIFSSMBClose(xid, tcon, fid.netfid);
591 }
592
593 return rc;
594}
595
596static int
597cifs_get_srv_inum(const unsigned int xid, struct cifs_tcon *tcon,
598 struct cifs_sb_info *cifs_sb, const char *full_path,
599 u64 *uniqueid, FILE_ALL_INFO *data)
600{
601 /*
602 * We can not use the IndexNumber field by default from Windows or
603 * Samba (in ALL_INFO buf) but we can request it explicitly. The SNIA
604 * CIFS spec claims that this value is unique within the scope of a
605 * share, and the windows docs hint that it's actually unique
606 * per-machine.
607 *
608 * There may be higher info levels that work but are there Windows
609 * server or network appliances for which IndexNumber field is not
610 * guaranteed unique?
611 */
612 return CIFSGetSrvInodeNumber(xid, tcon, full_path, uniqueid,
613 cifs_sb->local_nls,
614 cifs_sb->mnt_cifs_flags &
615 CIFS_MOUNT_MAP_SPECIAL_CHR);
616}
617
618static int
619cifs_query_file_info(const unsigned int xid, struct cifs_tcon *tcon,
620 struct cifs_fid *fid, FILE_ALL_INFO *data)
621{
622 return CIFSSMBQFileInfo(xid, tcon, fid->netfid, data);
623}
624
625static void
626cifs_clear_stats(struct cifs_tcon *tcon)
627{
628#ifdef CONFIG_CIFS_STATS
629 atomic_set(&tcon->stats.cifs_stats.num_writes, 0);
630 atomic_set(&tcon->stats.cifs_stats.num_reads, 0);
631 atomic_set(&tcon->stats.cifs_stats.num_flushes, 0);
632 atomic_set(&tcon->stats.cifs_stats.num_oplock_brks, 0);
633 atomic_set(&tcon->stats.cifs_stats.num_opens, 0);
634 atomic_set(&tcon->stats.cifs_stats.num_posixopens, 0);
635 atomic_set(&tcon->stats.cifs_stats.num_posixmkdirs, 0);
636 atomic_set(&tcon->stats.cifs_stats.num_closes, 0);
637 atomic_set(&tcon->stats.cifs_stats.num_deletes, 0);
638 atomic_set(&tcon->stats.cifs_stats.num_mkdirs, 0);
639 atomic_set(&tcon->stats.cifs_stats.num_rmdirs, 0);
640 atomic_set(&tcon->stats.cifs_stats.num_renames, 0);
641 atomic_set(&tcon->stats.cifs_stats.num_t2renames, 0);
642 atomic_set(&tcon->stats.cifs_stats.num_ffirst, 0);
643 atomic_set(&tcon->stats.cifs_stats.num_fnext, 0);
644 atomic_set(&tcon->stats.cifs_stats.num_fclose, 0);
645 atomic_set(&tcon->stats.cifs_stats.num_hardlinks, 0);
646 atomic_set(&tcon->stats.cifs_stats.num_symlinks, 0);
647 atomic_set(&tcon->stats.cifs_stats.num_locks, 0);
648 atomic_set(&tcon->stats.cifs_stats.num_acl_get, 0);
649 atomic_set(&tcon->stats.cifs_stats.num_acl_set, 0);
650#endif
651}
652
653static void
654cifs_print_stats(struct seq_file *m, struct cifs_tcon *tcon)
655{
656#ifdef CONFIG_CIFS_STATS
657 seq_printf(m, " Oplocks breaks: %d",
658 atomic_read(&tcon->stats.cifs_stats.num_oplock_brks));
659 seq_printf(m, "\nReads: %d Bytes: %llu",
660 atomic_read(&tcon->stats.cifs_stats.num_reads),
661 (long long)(tcon->bytes_read));
662 seq_printf(m, "\nWrites: %d Bytes: %llu",
663 atomic_read(&tcon->stats.cifs_stats.num_writes),
664 (long long)(tcon->bytes_written));
665 seq_printf(m, "\nFlushes: %d",
666 atomic_read(&tcon->stats.cifs_stats.num_flushes));
667 seq_printf(m, "\nLocks: %d HardLinks: %d Symlinks: %d",
668 atomic_read(&tcon->stats.cifs_stats.num_locks),
669 atomic_read(&tcon->stats.cifs_stats.num_hardlinks),
670 atomic_read(&tcon->stats.cifs_stats.num_symlinks));
671 seq_printf(m, "\nOpens: %d Closes: %d Deletes: %d",
672 atomic_read(&tcon->stats.cifs_stats.num_opens),
673 atomic_read(&tcon->stats.cifs_stats.num_closes),
674 atomic_read(&tcon->stats.cifs_stats.num_deletes));
675 seq_printf(m, "\nPosix Opens: %d Posix Mkdirs: %d",
676 atomic_read(&tcon->stats.cifs_stats.num_posixopens),
677 atomic_read(&tcon->stats.cifs_stats.num_posixmkdirs));
678 seq_printf(m, "\nMkdirs: %d Rmdirs: %d",
679 atomic_read(&tcon->stats.cifs_stats.num_mkdirs),
680 atomic_read(&tcon->stats.cifs_stats.num_rmdirs));
681 seq_printf(m, "\nRenames: %d T2 Renames %d",
682 atomic_read(&tcon->stats.cifs_stats.num_renames),
683 atomic_read(&tcon->stats.cifs_stats.num_t2renames));
684 seq_printf(m, "\nFindFirst: %d FNext %d FClose %d",
685 atomic_read(&tcon->stats.cifs_stats.num_ffirst),
686 atomic_read(&tcon->stats.cifs_stats.num_fnext),
687 atomic_read(&tcon->stats.cifs_stats.num_fclose));
688#endif
689}
690
691static void
692cifs_mkdir_setinfo(struct inode *inode, const char *full_path,
693 struct cifs_sb_info *cifs_sb, struct cifs_tcon *tcon,
694 const unsigned int xid)
695{
696 FILE_BASIC_INFO info;
697 struct cifsInodeInfo *cifsInode;
698 u32 dosattrs;
699 int rc;
700
701 memset(&info, 0, sizeof(info));
702 cifsInode = CIFS_I(inode);
703 dosattrs = cifsInode->cifsAttrs|ATTR_READONLY;
704 info.Attributes = cpu_to_le32(dosattrs);
705 rc = CIFSSMBSetPathInfo(xid, tcon, full_path, &info, cifs_sb->local_nls,
706 cifs_sb->mnt_cifs_flags &
707 CIFS_MOUNT_MAP_SPECIAL_CHR);
708 if (rc == 0)
709 cifsInode->cifsAttrs = dosattrs;
710}
711
712static int
713cifs_open_file(const unsigned int xid, struct cifs_open_parms *oparms,
714 __u32 *oplock, FILE_ALL_INFO *buf)
715{
716 if (!(oparms->tcon->ses->capabilities & CAP_NT_SMBS))
717 return SMBLegacyOpen(xid, oparms->tcon, oparms->path,
718 oparms->disposition,
719 oparms->desired_access,
720 oparms->create_options,
721 &oparms->fid->netfid, oplock, buf,
722 oparms->cifs_sb->local_nls,
723 oparms->cifs_sb->mnt_cifs_flags
724 & CIFS_MOUNT_MAP_SPECIAL_CHR);
725 return CIFS_open(xid, oparms, oplock, buf);
726}
727
728static void
729cifs_set_fid(struct cifsFileInfo *cfile, struct cifs_fid *fid, __u32 oplock)
730{
731 struct cifsInodeInfo *cinode = CIFS_I(cfile->dentry->d_inode);
732 cfile->fid.netfid = fid->netfid;
733 cifs_set_oplock_level(cinode, oplock);
734 cinode->can_cache_brlcks = CIFS_CACHE_WRITE(cinode);
735}
736
737static void
738cifs_close_file(const unsigned int xid, struct cifs_tcon *tcon,
739 struct cifs_fid *fid)
740{
741 CIFSSMBClose(xid, tcon, fid->netfid);
742}
743
744static int
745cifs_flush_file(const unsigned int xid, struct cifs_tcon *tcon,
746 struct cifs_fid *fid)
747{
748 return CIFSSMBFlush(xid, tcon, fid->netfid);
749}
750
751static int
752cifs_sync_read(const unsigned int xid, struct cifsFileInfo *cfile,
753 struct cifs_io_parms *parms, unsigned int *bytes_read,
754 char **buf, int *buf_type)
755{
756 parms->netfid = cfile->fid.netfid;
757 return CIFSSMBRead(xid, parms, bytes_read, buf, buf_type);
758}
759
760static int
761cifs_sync_write(const unsigned int xid, struct cifsFileInfo *cfile,
762 struct cifs_io_parms *parms, unsigned int *written,
763 struct kvec *iov, unsigned long nr_segs)
764{
765
766 parms->netfid = cfile->fid.netfid;
767 return CIFSSMBWrite2(xid, parms, written, iov, nr_segs);
768}
769
770static int
771smb_set_file_info(struct inode *inode, const char *full_path,
772 FILE_BASIC_INFO *buf, const unsigned int xid)
773{
774 int oplock = 0;
775 int rc;
776 __u32 netpid;
777 struct cifs_fid fid;
778 struct cifs_open_parms oparms;
779 struct cifsFileInfo *open_file;
780 struct cifsInodeInfo *cinode = CIFS_I(inode);
781 struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
782 struct tcon_link *tlink = NULL;
783 struct cifs_tcon *tcon;
784
785 /* if the file is already open for write, just use that fileid */
786 open_file = find_writable_file(cinode, true);
787 if (open_file) {
788 fid.netfid = open_file->fid.netfid;
789 netpid = open_file->pid;
790 tcon = tlink_tcon(open_file->tlink);
791 goto set_via_filehandle;
792 }
793
794 tlink = cifs_sb_tlink(cifs_sb);
795 if (IS_ERR(tlink)) {
796 rc = PTR_ERR(tlink);
797 tlink = NULL;
798 goto out;
799 }
800 tcon = tlink_tcon(tlink);
801
802 rc = CIFSSMBSetPathInfo(xid, tcon, full_path, buf, cifs_sb->local_nls,
803 cifs_sb->mnt_cifs_flags &
804 CIFS_MOUNT_MAP_SPECIAL_CHR);
805 if (rc == 0) {
806 cinode->cifsAttrs = le32_to_cpu(buf->Attributes);
807 goto out;
808 } else if (rc != -EOPNOTSUPP && rc != -EINVAL) {
809 goto out;
810 }
811
812 oparms.tcon = tcon;
813 oparms.cifs_sb = cifs_sb;
814 oparms.desired_access = SYNCHRONIZE | FILE_WRITE_ATTRIBUTES;
815 oparms.create_options = CREATE_NOT_DIR;
816 oparms.disposition = FILE_OPEN;
817 oparms.path = full_path;
818 oparms.fid = &fid;
819 oparms.reconnect = false;
820
821 cifs_dbg(FYI, "calling SetFileInfo since SetPathInfo for times not supported by this server\n");
822 rc = CIFS_open(xid, &oparms, &oplock, NULL);
823 if (rc != 0) {
824 if (rc == -EIO)
825 rc = -EINVAL;
826 goto out;
827 }
828
829 netpid = current->tgid;
830
831set_via_filehandle:
832 rc = CIFSSMBSetFileInfo(xid, tcon, buf, fid.netfid, netpid);
833 if (!rc)
834 cinode->cifsAttrs = le32_to_cpu(buf->Attributes);
835
836 if (open_file == NULL)
837 CIFSSMBClose(xid, tcon, fid.netfid);
838 else
839 cifsFileInfo_put(open_file);
840out:
841 if (tlink != NULL)
842 cifs_put_tlink(tlink);
843 return rc;
844}
845
846static int
847cifs_set_compression(const unsigned int xid, struct cifs_tcon *tcon,
848 struct cifsFileInfo *cfile)
849{
850 return CIFSSMB_set_compression(xid, tcon, cfile->fid.netfid);
851}
852
853static int
854cifs_query_dir_first(const unsigned int xid, struct cifs_tcon *tcon,
855 const char *path, struct cifs_sb_info *cifs_sb,
856 struct cifs_fid *fid, __u16 search_flags,
857 struct cifs_search_info *srch_inf)
858{
859 return CIFSFindFirst(xid, tcon, path, cifs_sb,
860 &fid->netfid, search_flags, srch_inf, true);
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 if (rc == -EREMOTE)
972 rc = cifs_unix_dfs_readlink(xid, tcon, full_path,
973 target_path,
974 cifs_sb->local_nls);
975
976 goto out;
977 }
978
979 oparms.tcon = tcon;
980 oparms.cifs_sb = cifs_sb;
981 oparms.desired_access = FILE_READ_ATTRIBUTES;
982 oparms.create_options = OPEN_REPARSE_POINT;
983 oparms.disposition = FILE_OPEN;
984 oparms.path = full_path;
985 oparms.fid = &fid;
986 oparms.reconnect = false;
987
988 rc = CIFS_open(xid, &oparms, &oplock, NULL);
989 if (rc)
990 goto out;
991
992 rc = CIFSSMBQuerySymLink(xid, tcon, fid.netfid, target_path,
993 cifs_sb->local_nls);
994 if (rc)
995 goto out_close;
996
997 convert_delimiter(*target_path, '/');
998out_close:
999 CIFSSMBClose(xid, tcon, fid.netfid);
1000out:
1001 if (!rc)
1002 cifs_dbg(FYI, "%s: target path: %s\n", __func__, *target_path);
1003 return rc;
1004}
1005
1006static bool
1007cifs_is_read_op(__u32 oplock)
1008{
1009 return oplock == OPLOCK_READ;
1010}
1011
1012struct smb_version_operations smb1_operations = {
1013 .send_cancel = send_nt_cancel,
1014 .compare_fids = cifs_compare_fids,
1015 .setup_request = cifs_setup_request,
1016 .setup_async_request = cifs_setup_async_request,
1017 .check_receive = cifs_check_receive,
1018 .add_credits = cifs_add_credits,
1019 .set_credits = cifs_set_credits,
1020 .get_credits_field = cifs_get_credits_field,
1021 .get_credits = cifs_get_credits,
1022 .get_next_mid = cifs_get_next_mid,
1023 .read_data_offset = cifs_read_data_offset,
1024 .read_data_length = cifs_read_data_length,
1025 .map_error = map_smb_to_linux_error,
1026 .find_mid = cifs_find_mid,
1027 .check_message = checkSMB,
1028 .dump_detail = cifs_dump_detail,
1029 .clear_stats = cifs_clear_stats,
1030 .print_stats = cifs_print_stats,
1031 .is_oplock_break = is_valid_oplock_break,
1032 .downgrade_oplock = cifs_downgrade_oplock,
1033 .check_trans2 = cifs_check_trans2,
1034 .need_neg = cifs_need_neg,
1035 .negotiate = cifs_negotiate,
1036 .negotiate_wsize = cifs_negotiate_wsize,
1037 .negotiate_rsize = cifs_negotiate_rsize,
1038 .sess_setup = CIFS_SessSetup,
1039 .logoff = CIFSSMBLogoff,
1040 .tree_connect = CIFSTCon,
1041 .tree_disconnect = CIFSSMBTDis,
1042 .get_dfs_refer = CIFSGetDFSRefer,
1043 .qfs_tcon = cifs_qfs_tcon,
1044 .is_path_accessible = cifs_is_path_accessible,
1045 .query_path_info = cifs_query_path_info,
1046 .query_file_info = cifs_query_file_info,
1047 .get_srv_inum = cifs_get_srv_inum,
1048 .set_path_size = CIFSSMBSetEOF,
1049 .set_file_size = CIFSSMBSetFileSize,
1050 .set_file_info = smb_set_file_info,
1051 .set_compression = cifs_set_compression,
1052 .echo = CIFSSMBEcho,
1053 .mkdir = CIFSSMBMkDir,
1054 .mkdir_setinfo = cifs_mkdir_setinfo,
1055 .rmdir = CIFSSMBRmDir,
1056 .unlink = CIFSSMBDelFile,
1057 .rename_pending_delete = cifs_rename_pending_delete,
1058 .rename = CIFSSMBRename,
1059 .create_hardlink = CIFSCreateHardLink,
1060 .query_symlink = cifs_query_symlink,
1061 .open = cifs_open_file,
1062 .set_fid = cifs_set_fid,
1063 .close = cifs_close_file,
1064 .flush = cifs_flush_file,
1065 .async_readv = cifs_async_readv,
1066 .async_writev = cifs_async_writev,
1067 .sync_read = cifs_sync_read,
1068 .sync_write = cifs_sync_write,
1069 .query_dir_first = cifs_query_dir_first,
1070 .query_dir_next = cifs_query_dir_next,
1071 .close_dir = cifs_close_dir,
1072 .calc_smb_size = smbCalcSize,
1073 .oplock_response = cifs_oplock_response,
1074 .queryfs = cifs_queryfs,
1075 .mand_lock = cifs_mand_lock,
1076 .mand_unlock_range = cifs_unlock_range,
1077 .push_mand_locks = cifs_push_mandatory_locks,
1078 .query_mf_symlink = cifs_query_mf_symlink,
1079 .create_mf_symlink = cifs_create_mf_symlink,
1080 .is_read_op = cifs_is_read_op,
1081#ifdef CONFIG_CIFS_XATTR
1082 .query_all_EAs = CIFSSMBQAllEAs,
1083 .set_EA = CIFSSMBSetEA,
1084#endif /* CIFS_XATTR */
1085#ifdef CONFIG_CIFS_ACL
1086 .get_acl = get_cifs_acl,
1087 .get_acl_by_fid = get_cifs_acl_by_fid,
1088 .set_acl = set_cifs_acl,
1089#endif /* CIFS_ACL */
1090};
1091
1092struct smb_version_values smb1_values = {
1093 .version_string = SMB1_VERSION_STRING,
1094 .large_lock_type = LOCKING_ANDX_LARGE_FILES,
1095 .exclusive_lock_type = 0,
1096 .shared_lock_type = LOCKING_ANDX_SHARED_LOCK,
1097 .unlock_lock_type = 0,
1098 .header_size = sizeof(struct smb_hdr),
1099 .max_header_size = MAX_CIFS_HDR_SIZE,
1100 .read_rsp_size = sizeof(READ_RSP),
1101 .lock_cmd = cpu_to_le16(SMB_COM_LOCKING_ANDX),
1102 .cap_unix = CAP_UNIX,
1103 .cap_nt_find = CAP_NT_SMBS | CAP_NT_FIND,
1104 .cap_large_files = CAP_LARGE_FILES,
1105 .signing_enabled = SECMODE_SIGN_ENABLED,
1106 .signing_required = SECMODE_SIGN_REQUIRED,
1107};
1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * SMB1 (CIFS) version specific operations
4 *
5 * Copyright (c) 2012, Jeff Layton <jlayton@redhat.com>
6 */
7
8#include <linux/pagemap.h>
9#include <linux/vfs.h>
10#include "cifsglob.h"
11#include "cifsproto.h"
12#include "cifs_debug.h"
13#include "cifspdu.h"
14#include "cifs_unicode.h"
15
16/*
17 * An NT cancel request header looks just like the original request except:
18 *
19 * The Command is SMB_COM_NT_CANCEL
20 * The WordCount is zeroed out
21 * The ByteCount is zeroed out
22 *
23 * This function mangles an existing request buffer into a
24 * SMB_COM_NT_CANCEL request and then sends it.
25 */
26static int
27send_nt_cancel(struct TCP_Server_Info *server, struct smb_rqst *rqst,
28 struct mid_q_entry *mid)
29{
30 int rc = 0;
31 struct smb_hdr *in_buf = (struct smb_hdr *)rqst->rq_iov[0].iov_base;
32
33 /* -4 for RFC1001 length and +2 for BCC field */
34 in_buf->smb_buf_length = cpu_to_be32(sizeof(struct smb_hdr) - 4 + 2);
35 in_buf->Command = SMB_COM_NT_CANCEL;
36 in_buf->WordCount = 0;
37 put_bcc(0, in_buf);
38
39 mutex_lock(&server->srv_mutex);
40 rc = cifs_sign_smb(in_buf, server, &mid->sequence_number);
41 if (rc) {
42 mutex_unlock(&server->srv_mutex);
43 return rc;
44 }
45
46 /*
47 * The response to this call was already factored into the sequence
48 * number when the call went out, so we must adjust it back downward
49 * after signing here.
50 */
51 --server->sequence_number;
52 rc = smb_send(server, in_buf, be32_to_cpu(in_buf->smb_buf_length));
53 if (rc < 0)
54 server->sequence_number--;
55
56 mutex_unlock(&server->srv_mutex);
57
58 cifs_dbg(FYI, "issued NT_CANCEL for mid %u, rc = %d\n",
59 get_mid(in_buf), rc);
60
61 return rc;
62}
63
64static bool
65cifs_compare_fids(struct cifsFileInfo *ob1, struct cifsFileInfo *ob2)
66{
67 return ob1->fid.netfid == ob2->fid.netfid;
68}
69
70static unsigned int
71cifs_read_data_offset(char *buf)
72{
73 READ_RSP *rsp = (READ_RSP *)buf;
74 return le16_to_cpu(rsp->DataOffset);
75}
76
77static unsigned int
78cifs_read_data_length(char *buf, bool in_remaining)
79{
80 READ_RSP *rsp = (READ_RSP *)buf;
81 /* It's a bug reading remaining data for SMB1 packets */
82 WARN_ON(in_remaining);
83 return (le16_to_cpu(rsp->DataLengthHigh) << 16) +
84 le16_to_cpu(rsp->DataLength);
85}
86
87static struct mid_q_entry *
88cifs_find_mid(struct TCP_Server_Info *server, char *buffer)
89{
90 struct smb_hdr *buf = (struct smb_hdr *)buffer;
91 struct mid_q_entry *mid;
92
93 spin_lock(&GlobalMid_Lock);
94 list_for_each_entry(mid, &server->pending_mid_q, qhead) {
95 if (compare_mid(mid->mid, buf) &&
96 mid->mid_state == MID_REQUEST_SUBMITTED &&
97 le16_to_cpu(mid->command) == buf->Command) {
98 kref_get(&mid->refcount);
99 spin_unlock(&GlobalMid_Lock);
100 return mid;
101 }
102 }
103 spin_unlock(&GlobalMid_Lock);
104 return NULL;
105}
106
107static void
108cifs_add_credits(struct TCP_Server_Info *server,
109 const struct cifs_credits *credits, const int optype)
110{
111 spin_lock(&server->req_lock);
112 server->credits += credits->value;
113 server->in_flight--;
114 spin_unlock(&server->req_lock);
115 wake_up(&server->request_q);
116}
117
118static void
119cifs_set_credits(struct TCP_Server_Info *server, const int val)
120{
121 spin_lock(&server->req_lock);
122 server->credits = val;
123 server->oplocks = val > 1 ? enable_oplocks : false;
124 spin_unlock(&server->req_lock);
125}
126
127static int *
128cifs_get_credits_field(struct TCP_Server_Info *server, const int optype)
129{
130 return &server->credits;
131}
132
133static unsigned int
134cifs_get_credits(struct mid_q_entry *mid)
135{
136 return 1;
137}
138
139/*
140 * Find a free multiplex id (SMB mid). Otherwise there could be
141 * mid collisions which might cause problems, demultiplexing the
142 * wrong response to this request. Multiplex ids could collide if
143 * one of a series requests takes much longer than the others, or
144 * if a very large number of long lived requests (byte range
145 * locks or FindNotify requests) are pending. No more than
146 * 64K-1 requests can be outstanding at one time. If no
147 * mids are available, return zero. A future optimization
148 * could make the combination of mids and uid the key we use
149 * to demultiplex on (rather than mid alone).
150 * In addition to the above check, the cifs demultiplex
151 * code already used the command code as a secondary
152 * check of the frame and if signing is negotiated the
153 * response would be discarded if the mid were the same
154 * but the signature was wrong. Since the mid is not put in the
155 * pending queue until later (when it is about to be dispatched)
156 * we do have to limit the number of outstanding requests
157 * to somewhat less than 64K-1 although it is hard to imagine
158 * so many threads being in the vfs at one time.
159 */
160static __u64
161cifs_get_next_mid(struct TCP_Server_Info *server)
162{
163 __u64 mid = 0;
164 __u16 last_mid, cur_mid;
165 bool collision;
166
167 spin_lock(&GlobalMid_Lock);
168
169 /* mid is 16 bit only for CIFS/SMB */
170 cur_mid = (__u16)((server->CurrentMid) & 0xffff);
171 /* we do not want to loop forever */
172 last_mid = cur_mid;
173 cur_mid++;
174 /* avoid 0xFFFF MID */
175 if (cur_mid == 0xffff)
176 cur_mid++;
177
178 /*
179 * This nested loop looks more expensive than it is.
180 * In practice the list of pending requests is short,
181 * fewer than 50, and the mids are likely to be unique
182 * on the first pass through the loop unless some request
183 * takes longer than the 64 thousand requests before it
184 * (and it would also have to have been a request that
185 * did not time out).
186 */
187 while (cur_mid != last_mid) {
188 struct mid_q_entry *mid_entry;
189 unsigned int num_mids;
190
191 collision = false;
192 if (cur_mid == 0)
193 cur_mid++;
194
195 num_mids = 0;
196 list_for_each_entry(mid_entry, &server->pending_mid_q, qhead) {
197 ++num_mids;
198 if (mid_entry->mid == cur_mid &&
199 mid_entry->mid_state == MID_REQUEST_SUBMITTED) {
200 /* This mid is in use, try a different one */
201 collision = true;
202 break;
203 }
204 }
205
206 /*
207 * if we have more than 32k mids in the list, then something
208 * is very wrong. Possibly a local user is trying to DoS the
209 * box by issuing long-running calls and SIGKILL'ing them. If
210 * we get to 2^16 mids then we're in big trouble as this
211 * function could loop forever.
212 *
213 * Go ahead and assign out the mid in this situation, but force
214 * an eventual reconnect to clean out the pending_mid_q.
215 */
216 if (num_mids > 32768)
217 server->tcpStatus = CifsNeedReconnect;
218
219 if (!collision) {
220 mid = (__u64)cur_mid;
221 server->CurrentMid = mid;
222 break;
223 }
224 cur_mid++;
225 }
226 spin_unlock(&GlobalMid_Lock);
227 return mid;
228}
229
230/*
231 return codes:
232 0 not a transact2, or all data present
233 >0 transact2 with that much data missing
234 -EINVAL invalid transact2
235 */
236static int
237check2ndT2(char *buf)
238{
239 struct smb_hdr *pSMB = (struct smb_hdr *)buf;
240 struct smb_t2_rsp *pSMBt;
241 int remaining;
242 __u16 total_data_size, data_in_this_rsp;
243
244 if (pSMB->Command != SMB_COM_TRANSACTION2)
245 return 0;
246
247 /* check for plausible wct, bcc and t2 data and parm sizes */
248 /* check for parm and data offset going beyond end of smb */
249 if (pSMB->WordCount != 10) { /* coalesce_t2 depends on this */
250 cifs_dbg(FYI, "invalid transact2 word count\n");
251 return -EINVAL;
252 }
253
254 pSMBt = (struct smb_t2_rsp *)pSMB;
255
256 total_data_size = get_unaligned_le16(&pSMBt->t2_rsp.TotalDataCount);
257 data_in_this_rsp = get_unaligned_le16(&pSMBt->t2_rsp.DataCount);
258
259 if (total_data_size == data_in_this_rsp)
260 return 0;
261 else if (total_data_size < data_in_this_rsp) {
262 cifs_dbg(FYI, "total data %d smaller than data in frame %d\n",
263 total_data_size, data_in_this_rsp);
264 return -EINVAL;
265 }
266
267 remaining = total_data_size - data_in_this_rsp;
268
269 cifs_dbg(FYI, "missing %d bytes from transact2, check next response\n",
270 remaining);
271 if (total_data_size > CIFSMaxBufSize) {
272 cifs_dbg(VFS, "TotalDataSize %d is over maximum buffer %d\n",
273 total_data_size, CIFSMaxBufSize);
274 return -EINVAL;
275 }
276 return remaining;
277}
278
279static int
280coalesce_t2(char *second_buf, struct smb_hdr *target_hdr)
281{
282 struct smb_t2_rsp *pSMBs = (struct smb_t2_rsp *)second_buf;
283 struct smb_t2_rsp *pSMBt = (struct smb_t2_rsp *)target_hdr;
284 char *data_area_of_tgt;
285 char *data_area_of_src;
286 int remaining;
287 unsigned int byte_count, total_in_tgt;
288 __u16 tgt_total_cnt, src_total_cnt, total_in_src;
289
290 src_total_cnt = get_unaligned_le16(&pSMBs->t2_rsp.TotalDataCount);
291 tgt_total_cnt = get_unaligned_le16(&pSMBt->t2_rsp.TotalDataCount);
292
293 if (tgt_total_cnt != src_total_cnt)
294 cifs_dbg(FYI, "total data count of primary and secondary t2 differ source=%hu target=%hu\n",
295 src_total_cnt, tgt_total_cnt);
296
297 total_in_tgt = get_unaligned_le16(&pSMBt->t2_rsp.DataCount);
298
299 remaining = tgt_total_cnt - total_in_tgt;
300
301 if (remaining < 0) {
302 cifs_dbg(FYI, "Server sent too much data. tgt_total_cnt=%hu total_in_tgt=%u\n",
303 tgt_total_cnt, total_in_tgt);
304 return -EPROTO;
305 }
306
307 if (remaining == 0) {
308 /* nothing to do, ignore */
309 cifs_dbg(FYI, "no more data remains\n");
310 return 0;
311 }
312
313 total_in_src = get_unaligned_le16(&pSMBs->t2_rsp.DataCount);
314 if (remaining < total_in_src)
315 cifs_dbg(FYI, "transact2 2nd response contains too much data\n");
316
317 /* find end of first SMB data area */
318 data_area_of_tgt = (char *)&pSMBt->hdr.Protocol +
319 get_unaligned_le16(&pSMBt->t2_rsp.DataOffset);
320
321 /* validate target area */
322 data_area_of_src = (char *)&pSMBs->hdr.Protocol +
323 get_unaligned_le16(&pSMBs->t2_rsp.DataOffset);
324
325 data_area_of_tgt += total_in_tgt;
326
327 total_in_tgt += total_in_src;
328 /* is the result too big for the field? */
329 if (total_in_tgt > USHRT_MAX) {
330 cifs_dbg(FYI, "coalesced DataCount too large (%u)\n",
331 total_in_tgt);
332 return -EPROTO;
333 }
334 put_unaligned_le16(total_in_tgt, &pSMBt->t2_rsp.DataCount);
335
336 /* fix up the BCC */
337 byte_count = get_bcc(target_hdr);
338 byte_count += total_in_src;
339 /* is the result too big for the field? */
340 if (byte_count > USHRT_MAX) {
341 cifs_dbg(FYI, "coalesced BCC too large (%u)\n", byte_count);
342 return -EPROTO;
343 }
344 put_bcc(byte_count, target_hdr);
345
346 byte_count = be32_to_cpu(target_hdr->smb_buf_length);
347 byte_count += total_in_src;
348 /* don't allow buffer to overflow */
349 if (byte_count > CIFSMaxBufSize + MAX_CIFS_HDR_SIZE - 4) {
350 cifs_dbg(FYI, "coalesced BCC exceeds buffer size (%u)\n",
351 byte_count);
352 return -ENOBUFS;
353 }
354 target_hdr->smb_buf_length = cpu_to_be32(byte_count);
355
356 /* copy second buffer into end of first buffer */
357 memcpy(data_area_of_tgt, data_area_of_src, total_in_src);
358
359 if (remaining != total_in_src) {
360 /* more responses to go */
361 cifs_dbg(FYI, "waiting for more secondary responses\n");
362 return 1;
363 }
364
365 /* we are done */
366 cifs_dbg(FYI, "found the last secondary response\n");
367 return 0;
368}
369
370static void
371cifs_downgrade_oplock(struct TCP_Server_Info *server,
372 struct cifsInodeInfo *cinode, bool set_level2)
373{
374 if (set_level2)
375 cifs_set_oplock_level(cinode, OPLOCK_READ);
376 else
377 cifs_set_oplock_level(cinode, 0);
378}
379
380static bool
381cifs_check_trans2(struct mid_q_entry *mid, struct TCP_Server_Info *server,
382 char *buf, int malformed)
383{
384 if (malformed)
385 return false;
386 if (check2ndT2(buf) <= 0)
387 return false;
388 mid->multiRsp = true;
389 if (mid->resp_buf) {
390 /* merge response - fix up 1st*/
391 malformed = coalesce_t2(buf, mid->resp_buf);
392 if (malformed > 0)
393 return true;
394 /* All parts received or packet is malformed. */
395 mid->multiEnd = true;
396 dequeue_mid(mid, malformed);
397 return true;
398 }
399 if (!server->large_buf) {
400 /*FIXME: switch to already allocated largebuf?*/
401 cifs_dbg(VFS, "1st trans2 resp needs bigbuf\n");
402 } else {
403 /* Have first buffer */
404 mid->resp_buf = buf;
405 mid->large_buf = true;
406 server->bigbuf = NULL;
407 }
408 return true;
409}
410
411static bool
412cifs_need_neg(struct TCP_Server_Info *server)
413{
414 return server->maxBuf == 0;
415}
416
417static int
418cifs_negotiate(const unsigned int xid, struct cifs_ses *ses)
419{
420 int rc;
421 rc = CIFSSMBNegotiate(xid, ses);
422 if (rc == -EAGAIN) {
423 /* retry only once on 1st time connection */
424 set_credits(ses->server, 1);
425 rc = CIFSSMBNegotiate(xid, ses);
426 if (rc == -EAGAIN)
427 rc = -EHOSTDOWN;
428 }
429 return rc;
430}
431
432static unsigned int
433cifs_negotiate_wsize(struct cifs_tcon *tcon, struct smb_vol *volume_info)
434{
435 __u64 unix_cap = le64_to_cpu(tcon->fsUnixInfo.Capability);
436 struct TCP_Server_Info *server = tcon->ses->server;
437 unsigned int wsize;
438
439 /* start with specified wsize, or default */
440 if (volume_info->wsize)
441 wsize = volume_info->wsize;
442 else if (tcon->unix_ext && (unix_cap & CIFS_UNIX_LARGE_WRITE_CAP))
443 wsize = CIFS_DEFAULT_IOSIZE;
444 else
445 wsize = CIFS_DEFAULT_NON_POSIX_WSIZE;
446
447 /* can server support 24-bit write sizes? (via UNIX extensions) */
448 if (!tcon->unix_ext || !(unix_cap & CIFS_UNIX_LARGE_WRITE_CAP))
449 wsize = min_t(unsigned int, wsize, CIFS_MAX_RFC1002_WSIZE);
450
451 /*
452 * no CAP_LARGE_WRITE_X or is signing enabled without CAP_UNIX set?
453 * Limit it to max buffer offered by the server, minus the size of the
454 * WRITEX header, not including the 4 byte RFC1001 length.
455 */
456 if (!(server->capabilities & CAP_LARGE_WRITE_X) ||
457 (!(server->capabilities & CAP_UNIX) && server->sign))
458 wsize = min_t(unsigned int, wsize,
459 server->maxBuf - sizeof(WRITE_REQ) + 4);
460
461 /* hard limit of CIFS_MAX_WSIZE */
462 wsize = min_t(unsigned int, wsize, CIFS_MAX_WSIZE);
463
464 return wsize;
465}
466
467static unsigned int
468cifs_negotiate_rsize(struct cifs_tcon *tcon, struct smb_vol *volume_info)
469{
470 __u64 unix_cap = le64_to_cpu(tcon->fsUnixInfo.Capability);
471 struct TCP_Server_Info *server = tcon->ses->server;
472 unsigned int rsize, defsize;
473
474 /*
475 * Set default value...
476 *
477 * HACK alert! Ancient servers have very small buffers. Even though
478 * MS-CIFS indicates that servers are only limited by the client's
479 * bufsize for reads, testing against win98se shows that it throws
480 * INVALID_PARAMETER errors if you try to request too large a read.
481 * OS/2 just sends back short reads.
482 *
483 * If the server doesn't advertise CAP_LARGE_READ_X, then assume that
484 * it can't handle a read request larger than its MaxBufferSize either.
485 */
486 if (tcon->unix_ext && (unix_cap & CIFS_UNIX_LARGE_READ_CAP))
487 defsize = CIFS_DEFAULT_IOSIZE;
488 else if (server->capabilities & CAP_LARGE_READ_X)
489 defsize = CIFS_DEFAULT_NON_POSIX_RSIZE;
490 else
491 defsize = server->maxBuf - sizeof(READ_RSP);
492
493 rsize = volume_info->rsize ? volume_info->rsize : defsize;
494
495 /*
496 * no CAP_LARGE_READ_X? Then MS-CIFS states that we must limit this to
497 * the client's MaxBufferSize.
498 */
499 if (!(server->capabilities & CAP_LARGE_READ_X))
500 rsize = min_t(unsigned int, CIFSMaxBufSize, rsize);
501
502 /* hard limit of CIFS_MAX_RSIZE */
503 rsize = min_t(unsigned int, rsize, CIFS_MAX_RSIZE);
504
505 return rsize;
506}
507
508static void
509cifs_qfs_tcon(const unsigned int xid, struct cifs_tcon *tcon)
510{
511 CIFSSMBQFSDeviceInfo(xid, tcon);
512 CIFSSMBQFSAttributeInfo(xid, tcon);
513}
514
515static int
516cifs_is_path_accessible(const unsigned int xid, struct cifs_tcon *tcon,
517 struct cifs_sb_info *cifs_sb, const char *full_path)
518{
519 int rc;
520 FILE_ALL_INFO *file_info;
521
522 file_info = kmalloc(sizeof(FILE_ALL_INFO), GFP_KERNEL);
523 if (file_info == NULL)
524 return -ENOMEM;
525
526 rc = CIFSSMBQPathInfo(xid, tcon, full_path, file_info,
527 0 /* not legacy */, cifs_sb->local_nls,
528 cifs_remap(cifs_sb));
529
530 if (rc == -EOPNOTSUPP || rc == -EINVAL)
531 rc = SMBQueryInformation(xid, tcon, full_path, file_info,
532 cifs_sb->local_nls, cifs_remap(cifs_sb));
533 kfree(file_info);
534 return rc;
535}
536
537static int
538cifs_query_path_info(const unsigned int xid, struct cifs_tcon *tcon,
539 struct cifs_sb_info *cifs_sb, const char *full_path,
540 FILE_ALL_INFO *data, bool *adjustTZ, bool *symlink)
541{
542 int rc;
543
544 *symlink = false;
545
546 /* could do find first instead but this returns more info */
547 rc = CIFSSMBQPathInfo(xid, tcon, full_path, data, 0 /* not legacy */,
548 cifs_sb->local_nls, cifs_remap(cifs_sb));
549 /*
550 * BB optimize code so we do not make the above call when server claims
551 * no NT SMB support and the above call failed at least once - set flag
552 * in tcon or mount.
553 */
554 if ((rc == -EOPNOTSUPP) || (rc == -EINVAL)) {
555 rc = SMBQueryInformation(xid, tcon, full_path, data,
556 cifs_sb->local_nls,
557 cifs_remap(cifs_sb));
558 *adjustTZ = true;
559 }
560
561 if (!rc && (le32_to_cpu(data->Attributes) & ATTR_REPARSE)) {
562 int tmprc;
563 int oplock = 0;
564 struct cifs_fid fid;
565 struct cifs_open_parms oparms;
566
567 oparms.tcon = tcon;
568 oparms.cifs_sb = cifs_sb;
569 oparms.desired_access = FILE_READ_ATTRIBUTES;
570 oparms.create_options = 0;
571 oparms.disposition = FILE_OPEN;
572 oparms.path = full_path;
573 oparms.fid = &fid;
574 oparms.reconnect = false;
575
576 /* Need to check if this is a symbolic link or not */
577 tmprc = CIFS_open(xid, &oparms, &oplock, NULL);
578 if (tmprc == -EOPNOTSUPP)
579 *symlink = true;
580 else if (tmprc == 0)
581 CIFSSMBClose(xid, tcon, fid.netfid);
582 }
583
584 return rc;
585}
586
587static int
588cifs_get_srv_inum(const unsigned int xid, struct cifs_tcon *tcon,
589 struct cifs_sb_info *cifs_sb, const char *full_path,
590 u64 *uniqueid, FILE_ALL_INFO *data)
591{
592 /*
593 * We can not use the IndexNumber field by default from Windows or
594 * Samba (in ALL_INFO buf) but we can request it explicitly. The SNIA
595 * CIFS spec claims that this value is unique within the scope of a
596 * share, and the windows docs hint that it's actually unique
597 * per-machine.
598 *
599 * There may be higher info levels that work but are there Windows
600 * server or network appliances for which IndexNumber field is not
601 * guaranteed unique?
602 */
603 return CIFSGetSrvInodeNumber(xid, tcon, full_path, uniqueid,
604 cifs_sb->local_nls,
605 cifs_remap(cifs_sb));
606}
607
608static int
609cifs_query_file_info(const unsigned int xid, struct cifs_tcon *tcon,
610 struct cifs_fid *fid, FILE_ALL_INFO *data)
611{
612 return CIFSSMBQFileInfo(xid, tcon, fid->netfid, data);
613}
614
615static void
616cifs_clear_stats(struct cifs_tcon *tcon)
617{
618 atomic_set(&tcon->stats.cifs_stats.num_writes, 0);
619 atomic_set(&tcon->stats.cifs_stats.num_reads, 0);
620 atomic_set(&tcon->stats.cifs_stats.num_flushes, 0);
621 atomic_set(&tcon->stats.cifs_stats.num_oplock_brks, 0);
622 atomic_set(&tcon->stats.cifs_stats.num_opens, 0);
623 atomic_set(&tcon->stats.cifs_stats.num_posixopens, 0);
624 atomic_set(&tcon->stats.cifs_stats.num_posixmkdirs, 0);
625 atomic_set(&tcon->stats.cifs_stats.num_closes, 0);
626 atomic_set(&tcon->stats.cifs_stats.num_deletes, 0);
627 atomic_set(&tcon->stats.cifs_stats.num_mkdirs, 0);
628 atomic_set(&tcon->stats.cifs_stats.num_rmdirs, 0);
629 atomic_set(&tcon->stats.cifs_stats.num_renames, 0);
630 atomic_set(&tcon->stats.cifs_stats.num_t2renames, 0);
631 atomic_set(&tcon->stats.cifs_stats.num_ffirst, 0);
632 atomic_set(&tcon->stats.cifs_stats.num_fnext, 0);
633 atomic_set(&tcon->stats.cifs_stats.num_fclose, 0);
634 atomic_set(&tcon->stats.cifs_stats.num_hardlinks, 0);
635 atomic_set(&tcon->stats.cifs_stats.num_symlinks, 0);
636 atomic_set(&tcon->stats.cifs_stats.num_locks, 0);
637 atomic_set(&tcon->stats.cifs_stats.num_acl_get, 0);
638 atomic_set(&tcon->stats.cifs_stats.num_acl_set, 0);
639}
640
641static void
642cifs_print_stats(struct seq_file *m, struct cifs_tcon *tcon)
643{
644 seq_printf(m, " Oplocks breaks: %d",
645 atomic_read(&tcon->stats.cifs_stats.num_oplock_brks));
646 seq_printf(m, "\nReads: %d Bytes: %llu",
647 atomic_read(&tcon->stats.cifs_stats.num_reads),
648 (long long)(tcon->bytes_read));
649 seq_printf(m, "\nWrites: %d Bytes: %llu",
650 atomic_read(&tcon->stats.cifs_stats.num_writes),
651 (long long)(tcon->bytes_written));
652 seq_printf(m, "\nFlushes: %d",
653 atomic_read(&tcon->stats.cifs_stats.num_flushes));
654 seq_printf(m, "\nLocks: %d HardLinks: %d Symlinks: %d",
655 atomic_read(&tcon->stats.cifs_stats.num_locks),
656 atomic_read(&tcon->stats.cifs_stats.num_hardlinks),
657 atomic_read(&tcon->stats.cifs_stats.num_symlinks));
658 seq_printf(m, "\nOpens: %d Closes: %d Deletes: %d",
659 atomic_read(&tcon->stats.cifs_stats.num_opens),
660 atomic_read(&tcon->stats.cifs_stats.num_closes),
661 atomic_read(&tcon->stats.cifs_stats.num_deletes));
662 seq_printf(m, "\nPosix Opens: %d Posix Mkdirs: %d",
663 atomic_read(&tcon->stats.cifs_stats.num_posixopens),
664 atomic_read(&tcon->stats.cifs_stats.num_posixmkdirs));
665 seq_printf(m, "\nMkdirs: %d Rmdirs: %d",
666 atomic_read(&tcon->stats.cifs_stats.num_mkdirs),
667 atomic_read(&tcon->stats.cifs_stats.num_rmdirs));
668 seq_printf(m, "\nRenames: %d T2 Renames %d",
669 atomic_read(&tcon->stats.cifs_stats.num_renames),
670 atomic_read(&tcon->stats.cifs_stats.num_t2renames));
671 seq_printf(m, "\nFindFirst: %d FNext %d FClose %d",
672 atomic_read(&tcon->stats.cifs_stats.num_ffirst),
673 atomic_read(&tcon->stats.cifs_stats.num_fnext),
674 atomic_read(&tcon->stats.cifs_stats.num_fclose));
675}
676
677static void
678cifs_mkdir_setinfo(struct inode *inode, const char *full_path,
679 struct cifs_sb_info *cifs_sb, struct cifs_tcon *tcon,
680 const unsigned int xid)
681{
682 FILE_BASIC_INFO info;
683 struct cifsInodeInfo *cifsInode;
684 u32 dosattrs;
685 int rc;
686
687 memset(&info, 0, sizeof(info));
688 cifsInode = CIFS_I(inode);
689 dosattrs = cifsInode->cifsAttrs|ATTR_READONLY;
690 info.Attributes = cpu_to_le32(dosattrs);
691 rc = CIFSSMBSetPathInfo(xid, tcon, full_path, &info, cifs_sb->local_nls,
692 cifs_remap(cifs_sb));
693 if (rc == 0)
694 cifsInode->cifsAttrs = dosattrs;
695}
696
697static int
698cifs_open_file(const unsigned int xid, struct cifs_open_parms *oparms,
699 __u32 *oplock, FILE_ALL_INFO *buf)
700{
701 if (!(oparms->tcon->ses->capabilities & CAP_NT_SMBS))
702 return SMBLegacyOpen(xid, oparms->tcon, oparms->path,
703 oparms->disposition,
704 oparms->desired_access,
705 oparms->create_options,
706 &oparms->fid->netfid, oplock, buf,
707 oparms->cifs_sb->local_nls,
708 cifs_remap(oparms->cifs_sb));
709 return CIFS_open(xid, oparms, oplock, buf);
710}
711
712static void
713cifs_set_fid(struct cifsFileInfo *cfile, struct cifs_fid *fid, __u32 oplock)
714{
715 struct cifsInodeInfo *cinode = CIFS_I(d_inode(cfile->dentry));
716 cfile->fid.netfid = fid->netfid;
717 cifs_set_oplock_level(cinode, oplock);
718 cinode->can_cache_brlcks = CIFS_CACHE_WRITE(cinode);
719}
720
721static void
722cifs_close_file(const unsigned int xid, struct cifs_tcon *tcon,
723 struct cifs_fid *fid)
724{
725 CIFSSMBClose(xid, tcon, fid->netfid);
726}
727
728static int
729cifs_flush_file(const unsigned int xid, struct cifs_tcon *tcon,
730 struct cifs_fid *fid)
731{
732 return CIFSSMBFlush(xid, tcon, fid->netfid);
733}
734
735static int
736cifs_sync_read(const unsigned int xid, struct cifs_fid *pfid,
737 struct cifs_io_parms *parms, unsigned int *bytes_read,
738 char **buf, int *buf_type)
739{
740 parms->netfid = pfid->netfid;
741 return CIFSSMBRead(xid, parms, bytes_read, buf, buf_type);
742}
743
744static int
745cifs_sync_write(const unsigned int xid, struct cifs_fid *pfid,
746 struct cifs_io_parms *parms, unsigned int *written,
747 struct kvec *iov, unsigned long nr_segs)
748{
749
750 parms->netfid = pfid->netfid;
751 return CIFSSMBWrite2(xid, parms, written, iov, nr_segs);
752}
753
754static int
755smb_set_file_info(struct inode *inode, const char *full_path,
756 FILE_BASIC_INFO *buf, const unsigned int xid)
757{
758 int oplock = 0;
759 int rc;
760 __u32 netpid;
761 struct cifs_fid fid;
762 struct cifs_open_parms oparms;
763 struct cifsFileInfo *open_file;
764 struct cifsInodeInfo *cinode = CIFS_I(inode);
765 struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
766 struct tcon_link *tlink = NULL;
767 struct cifs_tcon *tcon;
768
769 /* if the file is already open for write, just use that fileid */
770 open_file = find_writable_file(cinode, true);
771 if (open_file) {
772 fid.netfid = open_file->fid.netfid;
773 netpid = open_file->pid;
774 tcon = tlink_tcon(open_file->tlink);
775 goto set_via_filehandle;
776 }
777
778 tlink = cifs_sb_tlink(cifs_sb);
779 if (IS_ERR(tlink)) {
780 rc = PTR_ERR(tlink);
781 tlink = NULL;
782 goto out;
783 }
784 tcon = tlink_tcon(tlink);
785
786 rc = CIFSSMBSetPathInfo(xid, tcon, full_path, buf, cifs_sb->local_nls,
787 cifs_remap(cifs_sb));
788 if (rc == 0) {
789 cinode->cifsAttrs = le32_to_cpu(buf->Attributes);
790 goto out;
791 } else if (rc != -EOPNOTSUPP && rc != -EINVAL) {
792 goto out;
793 }
794
795 oparms.tcon = tcon;
796 oparms.cifs_sb = cifs_sb;
797 oparms.desired_access = SYNCHRONIZE | FILE_WRITE_ATTRIBUTES;
798 oparms.create_options = CREATE_NOT_DIR;
799 oparms.disposition = FILE_OPEN;
800 oparms.path = full_path;
801 oparms.fid = &fid;
802 oparms.reconnect = false;
803
804 cifs_dbg(FYI, "calling SetFileInfo since SetPathInfo for times not supported by this server\n");
805 rc = CIFS_open(xid, &oparms, &oplock, NULL);
806 if (rc != 0) {
807 if (rc == -EIO)
808 rc = -EINVAL;
809 goto out;
810 }
811
812 netpid = current->tgid;
813
814set_via_filehandle:
815 rc = CIFSSMBSetFileInfo(xid, tcon, buf, fid.netfid, netpid);
816 if (!rc)
817 cinode->cifsAttrs = le32_to_cpu(buf->Attributes);
818
819 if (open_file == NULL)
820 CIFSSMBClose(xid, tcon, fid.netfid);
821 else
822 cifsFileInfo_put(open_file);
823out:
824 if (tlink != NULL)
825 cifs_put_tlink(tlink);
826 return rc;
827}
828
829static int
830cifs_set_compression(const unsigned int xid, struct cifs_tcon *tcon,
831 struct cifsFileInfo *cfile)
832{
833 return CIFSSMB_set_compression(xid, tcon, cfile->fid.netfid);
834}
835
836static int
837cifs_query_dir_first(const unsigned int xid, struct cifs_tcon *tcon,
838 const char *path, struct cifs_sb_info *cifs_sb,
839 struct cifs_fid *fid, __u16 search_flags,
840 struct cifs_search_info *srch_inf)
841{
842 int rc;
843
844 rc = CIFSFindFirst(xid, tcon, path, cifs_sb,
845 &fid->netfid, search_flags, srch_inf, true);
846 if (rc)
847 cifs_dbg(FYI, "find first failed=%d\n", rc);
848 return rc;
849}
850
851static int
852cifs_query_dir_next(const unsigned int xid, struct cifs_tcon *tcon,
853 struct cifs_fid *fid, __u16 search_flags,
854 struct cifs_search_info *srch_inf)
855{
856 return CIFSFindNext(xid, tcon, fid->netfid, search_flags, srch_inf);
857}
858
859static int
860cifs_close_dir(const unsigned int xid, struct cifs_tcon *tcon,
861 struct cifs_fid *fid)
862{
863 return CIFSFindClose(xid, tcon, fid->netfid);
864}
865
866static int
867cifs_oplock_response(struct cifs_tcon *tcon, struct cifs_fid *fid,
868 struct cifsInodeInfo *cinode)
869{
870 return CIFSSMBLock(0, tcon, fid->netfid, current->tgid, 0, 0, 0, 0,
871 LOCKING_ANDX_OPLOCK_RELEASE, false,
872 CIFS_CACHE_READ(cinode) ? 1 : 0);
873}
874
875static int
876cifs_queryfs(const unsigned int xid, struct cifs_tcon *tcon,
877 struct kstatfs *buf)
878{
879 int rc = -EOPNOTSUPP;
880
881 buf->f_type = CIFS_MAGIC_NUMBER;
882
883 /*
884 * We could add a second check for a QFS Unix capability bit
885 */
886 if ((tcon->ses->capabilities & CAP_UNIX) &&
887 (CIFS_POSIX_EXTENSIONS & le64_to_cpu(tcon->fsUnixInfo.Capability)))
888 rc = CIFSSMBQFSPosixInfo(xid, tcon, buf);
889
890 /*
891 * Only need to call the old QFSInfo if failed on newer one,
892 * e.g. by OS/2.
893 **/
894 if (rc && (tcon->ses->capabilities & CAP_NT_SMBS))
895 rc = CIFSSMBQFSInfo(xid, tcon, buf);
896
897 /*
898 * Some old Windows servers also do not support level 103, retry with
899 * older level one if old server failed the previous call or we
900 * bypassed it because we detected that this was an older LANMAN sess
901 */
902 if (rc)
903 rc = SMBOldQFSInfo(xid, tcon, buf);
904 return rc;
905}
906
907static int
908cifs_mand_lock(const unsigned int xid, struct cifsFileInfo *cfile, __u64 offset,
909 __u64 length, __u32 type, int lock, int unlock, bool wait)
910{
911 return CIFSSMBLock(xid, tlink_tcon(cfile->tlink), cfile->fid.netfid,
912 current->tgid, length, offset, unlock, lock,
913 (__u8)type, wait, 0);
914}
915
916static int
917cifs_unix_dfs_readlink(const unsigned int xid, struct cifs_tcon *tcon,
918 const unsigned char *searchName, char **symlinkinfo,
919 const struct nls_table *nls_codepage)
920{
921#ifdef CONFIG_CIFS_DFS_UPCALL
922 int rc;
923 struct dfs_info3_param referral = {0};
924
925 rc = get_dfs_path(xid, tcon->ses, searchName, nls_codepage, &referral,
926 0);
927
928 if (!rc) {
929 *symlinkinfo = kstrndup(referral.node_name,
930 strlen(referral.node_name),
931 GFP_KERNEL);
932 free_dfs_info_param(&referral);
933 if (!*symlinkinfo)
934 rc = -ENOMEM;
935 }
936 return rc;
937#else /* No DFS support */
938 return -EREMOTE;
939#endif
940}
941
942static int
943cifs_query_symlink(const unsigned int xid, struct cifs_tcon *tcon,
944 struct cifs_sb_info *cifs_sb, const char *full_path,
945 char **target_path, bool is_reparse_point)
946{
947 int rc;
948 int oplock = 0;
949 struct cifs_fid fid;
950 struct cifs_open_parms oparms;
951
952 cifs_dbg(FYI, "%s: path: %s\n", __func__, full_path);
953
954 if (is_reparse_point) {
955 cifs_dbg(VFS, "reparse points not handled for SMB1 symlinks\n");
956 return -EOPNOTSUPP;
957 }
958
959 /* Check for unix extensions */
960 if (cap_unix(tcon->ses)) {
961 rc = CIFSSMBUnixQuerySymLink(xid, tcon, full_path, target_path,
962 cifs_sb->local_nls,
963 cifs_remap(cifs_sb));
964 if (rc == -EREMOTE)
965 rc = cifs_unix_dfs_readlink(xid, tcon, full_path,
966 target_path,
967 cifs_sb->local_nls);
968
969 goto out;
970 }
971
972 oparms.tcon = tcon;
973 oparms.cifs_sb = cifs_sb;
974 oparms.desired_access = FILE_READ_ATTRIBUTES;
975 oparms.create_options = OPEN_REPARSE_POINT;
976 oparms.disposition = FILE_OPEN;
977 oparms.path = full_path;
978 oparms.fid = &fid;
979 oparms.reconnect = false;
980
981 rc = CIFS_open(xid, &oparms, &oplock, NULL);
982 if (rc)
983 goto out;
984
985 rc = CIFSSMBQuerySymLink(xid, tcon, fid.netfid, target_path,
986 cifs_sb->local_nls);
987 if (rc)
988 goto out_close;
989
990 convert_delimiter(*target_path, '/');
991out_close:
992 CIFSSMBClose(xid, tcon, fid.netfid);
993out:
994 if (!rc)
995 cifs_dbg(FYI, "%s: target path: %s\n", __func__, *target_path);
996 return rc;
997}
998
999static bool
1000cifs_is_read_op(__u32 oplock)
1001{
1002 return oplock == OPLOCK_READ;
1003}
1004
1005static unsigned int
1006cifs_wp_retry_size(struct inode *inode)
1007{
1008 return CIFS_SB(inode->i_sb)->wsize;
1009}
1010
1011static bool
1012cifs_dir_needs_close(struct cifsFileInfo *cfile)
1013{
1014 return !cfile->srch_inf.endOfSearch && !cfile->invalidHandle;
1015}
1016
1017static bool
1018cifs_can_echo(struct TCP_Server_Info *server)
1019{
1020 if (server->tcpStatus == CifsGood)
1021 return true;
1022
1023 return false;
1024}
1025
1026static int
1027cifs_make_node(unsigned int xid, struct inode *inode,
1028 struct dentry *dentry, struct cifs_tcon *tcon,
1029 char *full_path, umode_t mode, dev_t dev)
1030{
1031 struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
1032 struct inode *newinode = NULL;
1033 int rc = -EPERM;
1034 int create_options = CREATE_NOT_DIR | CREATE_OPTION_SPECIAL;
1035 FILE_ALL_INFO *buf = NULL;
1036 struct cifs_io_parms io_parms;
1037 __u32 oplock = 0;
1038 struct cifs_fid fid;
1039 struct cifs_open_parms oparms;
1040 unsigned int bytes_written;
1041 struct win_dev *pdev;
1042 struct kvec iov[2];
1043
1044 if (tcon->unix_ext) {
1045 /*
1046 * SMB1 Unix Extensions: requires server support but
1047 * works with all special files
1048 */
1049 struct cifs_unix_set_info_args args = {
1050 .mode = mode & ~current_umask(),
1051 .ctime = NO_CHANGE_64,
1052 .atime = NO_CHANGE_64,
1053 .mtime = NO_CHANGE_64,
1054 .device = dev,
1055 };
1056 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SET_UID) {
1057 args.uid = current_fsuid();
1058 args.gid = current_fsgid();
1059 } else {
1060 args.uid = INVALID_UID; /* no change */
1061 args.gid = INVALID_GID; /* no change */
1062 }
1063 rc = CIFSSMBUnixSetPathInfo(xid, tcon, full_path, &args,
1064 cifs_sb->local_nls,
1065 cifs_remap(cifs_sb));
1066 if (rc)
1067 goto out;
1068
1069 rc = cifs_get_inode_info_unix(&newinode, full_path,
1070 inode->i_sb, xid);
1071
1072 if (rc == 0)
1073 d_instantiate(dentry, newinode);
1074 goto out;
1075 }
1076
1077 /*
1078 * SMB1 SFU emulation: should work with all servers, but only
1079 * support block and char device (no socket & fifo)
1080 */
1081 if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_UNX_EMUL))
1082 goto out;
1083
1084 if (!S_ISCHR(mode) && !S_ISBLK(mode))
1085 goto out;
1086
1087 cifs_dbg(FYI, "sfu compat create special file\n");
1088
1089 buf = kmalloc(sizeof(FILE_ALL_INFO), GFP_KERNEL);
1090 if (buf == NULL) {
1091 rc = -ENOMEM;
1092 goto out;
1093 }
1094
1095 if (backup_cred(cifs_sb))
1096 create_options |= CREATE_OPEN_BACKUP_INTENT;
1097
1098 oparms.tcon = tcon;
1099 oparms.cifs_sb = cifs_sb;
1100 oparms.desired_access = GENERIC_WRITE;
1101 oparms.create_options = create_options;
1102 oparms.disposition = FILE_CREATE;
1103 oparms.path = full_path;
1104 oparms.fid = &fid;
1105 oparms.reconnect = false;
1106
1107 if (tcon->ses->server->oplocks)
1108 oplock = REQ_OPLOCK;
1109 else
1110 oplock = 0;
1111 rc = tcon->ses->server->ops->open(xid, &oparms, &oplock, buf);
1112 if (rc)
1113 goto out;
1114
1115 /*
1116 * BB Do not bother to decode buf since no local inode yet to put
1117 * timestamps in, but we can reuse it safely.
1118 */
1119
1120 pdev = (struct win_dev *)buf;
1121 io_parms.pid = current->tgid;
1122 io_parms.tcon = tcon;
1123 io_parms.offset = 0;
1124 io_parms.length = sizeof(struct win_dev);
1125 iov[1].iov_base = buf;
1126 iov[1].iov_len = sizeof(struct win_dev);
1127 if (S_ISCHR(mode)) {
1128 memcpy(pdev->type, "IntxCHR", 8);
1129 pdev->major = cpu_to_le64(MAJOR(dev));
1130 pdev->minor = cpu_to_le64(MINOR(dev));
1131 rc = tcon->ses->server->ops->sync_write(xid, &fid, &io_parms,
1132 &bytes_written, iov, 1);
1133 } else if (S_ISBLK(mode)) {
1134 memcpy(pdev->type, "IntxBLK", 8);
1135 pdev->major = cpu_to_le64(MAJOR(dev));
1136 pdev->minor = cpu_to_le64(MINOR(dev));
1137 rc = tcon->ses->server->ops->sync_write(xid, &fid, &io_parms,
1138 &bytes_written, iov, 1);
1139 }
1140 tcon->ses->server->ops->close(xid, tcon, &fid);
1141 d_drop(dentry);
1142
1143 /* FIXME: add code here to set EAs */
1144out:
1145 kfree(buf);
1146 return rc;
1147}
1148
1149
1150
1151struct smb_version_operations smb1_operations = {
1152 .send_cancel = send_nt_cancel,
1153 .compare_fids = cifs_compare_fids,
1154 .setup_request = cifs_setup_request,
1155 .setup_async_request = cifs_setup_async_request,
1156 .check_receive = cifs_check_receive,
1157 .add_credits = cifs_add_credits,
1158 .set_credits = cifs_set_credits,
1159 .get_credits_field = cifs_get_credits_field,
1160 .get_credits = cifs_get_credits,
1161 .wait_mtu_credits = cifs_wait_mtu_credits,
1162 .get_next_mid = cifs_get_next_mid,
1163 .read_data_offset = cifs_read_data_offset,
1164 .read_data_length = cifs_read_data_length,
1165 .map_error = map_smb_to_linux_error,
1166 .find_mid = cifs_find_mid,
1167 .check_message = checkSMB,
1168 .dump_detail = cifs_dump_detail,
1169 .clear_stats = cifs_clear_stats,
1170 .print_stats = cifs_print_stats,
1171 .is_oplock_break = is_valid_oplock_break,
1172 .downgrade_oplock = cifs_downgrade_oplock,
1173 .check_trans2 = cifs_check_trans2,
1174 .need_neg = cifs_need_neg,
1175 .negotiate = cifs_negotiate,
1176 .negotiate_wsize = cifs_negotiate_wsize,
1177 .negotiate_rsize = cifs_negotiate_rsize,
1178 .sess_setup = CIFS_SessSetup,
1179 .logoff = CIFSSMBLogoff,
1180 .tree_connect = CIFSTCon,
1181 .tree_disconnect = CIFSSMBTDis,
1182 .get_dfs_refer = CIFSGetDFSRefer,
1183 .qfs_tcon = cifs_qfs_tcon,
1184 .is_path_accessible = cifs_is_path_accessible,
1185 .can_echo = cifs_can_echo,
1186 .query_path_info = cifs_query_path_info,
1187 .query_file_info = cifs_query_file_info,
1188 .get_srv_inum = cifs_get_srv_inum,
1189 .set_path_size = CIFSSMBSetEOF,
1190 .set_file_size = CIFSSMBSetFileSize,
1191 .set_file_info = smb_set_file_info,
1192 .set_compression = cifs_set_compression,
1193 .echo = CIFSSMBEcho,
1194 .mkdir = CIFSSMBMkDir,
1195 .mkdir_setinfo = cifs_mkdir_setinfo,
1196 .rmdir = CIFSSMBRmDir,
1197 .unlink = CIFSSMBDelFile,
1198 .rename_pending_delete = cifs_rename_pending_delete,
1199 .rename = CIFSSMBRename,
1200 .create_hardlink = CIFSCreateHardLink,
1201 .query_symlink = cifs_query_symlink,
1202 .open = cifs_open_file,
1203 .set_fid = cifs_set_fid,
1204 .close = cifs_close_file,
1205 .flush = cifs_flush_file,
1206 .async_readv = cifs_async_readv,
1207 .async_writev = cifs_async_writev,
1208 .sync_read = cifs_sync_read,
1209 .sync_write = cifs_sync_write,
1210 .query_dir_first = cifs_query_dir_first,
1211 .query_dir_next = cifs_query_dir_next,
1212 .close_dir = cifs_close_dir,
1213 .calc_smb_size = smbCalcSize,
1214 .oplock_response = cifs_oplock_response,
1215 .queryfs = cifs_queryfs,
1216 .mand_lock = cifs_mand_lock,
1217 .mand_unlock_range = cifs_unlock_range,
1218 .push_mand_locks = cifs_push_mandatory_locks,
1219 .query_mf_symlink = cifs_query_mf_symlink,
1220 .create_mf_symlink = cifs_create_mf_symlink,
1221 .is_read_op = cifs_is_read_op,
1222 .wp_retry_size = cifs_wp_retry_size,
1223 .dir_needs_close = cifs_dir_needs_close,
1224 .select_sectype = cifs_select_sectype,
1225#ifdef CONFIG_CIFS_XATTR
1226 .query_all_EAs = CIFSSMBQAllEAs,
1227 .set_EA = CIFSSMBSetEA,
1228#endif /* CIFS_XATTR */
1229 .get_acl = get_cifs_acl,
1230 .get_acl_by_fid = get_cifs_acl_by_fid,
1231 .set_acl = set_cifs_acl,
1232 .make_node = cifs_make_node,
1233};
1234
1235struct smb_version_values smb1_values = {
1236 .version_string = SMB1_VERSION_STRING,
1237 .protocol_id = SMB10_PROT_ID,
1238 .large_lock_type = LOCKING_ANDX_LARGE_FILES,
1239 .exclusive_lock_type = 0,
1240 .shared_lock_type = LOCKING_ANDX_SHARED_LOCK,
1241 .unlock_lock_type = 0,
1242 .header_preamble_size = 4,
1243 .header_size = sizeof(struct smb_hdr),
1244 .max_header_size = MAX_CIFS_HDR_SIZE,
1245 .read_rsp_size = sizeof(READ_RSP),
1246 .lock_cmd = cpu_to_le16(SMB_COM_LOCKING_ANDX),
1247 .cap_unix = CAP_UNIX,
1248 .cap_nt_find = CAP_NT_SMBS | CAP_NT_FIND,
1249 .cap_large_files = CAP_LARGE_FILES,
1250 .signing_enabled = SECMODE_SIGN_ENABLED,
1251 .signing_required = SECMODE_SIGN_REQUIRED,
1252};