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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#include "fs_context.h"
16
17/*
18 * An NT cancel request header looks just like the original request except:
19 *
20 * The Command is SMB_COM_NT_CANCEL
21 * The WordCount is zeroed out
22 * The ByteCount is zeroed out
23 *
24 * This function mangles an existing request buffer into a
25 * SMB_COM_NT_CANCEL request and then sends it.
26 */
27static int
28send_nt_cancel(struct TCP_Server_Info *server, struct smb_rqst *rqst,
29 struct mid_q_entry *mid)
30{
31 int rc = 0;
32 struct smb_hdr *in_buf = (struct smb_hdr *)rqst->rq_iov[0].iov_base;
33
34 /* -4 for RFC1001 length and +2 for BCC field */
35 in_buf->smb_buf_length = cpu_to_be32(sizeof(struct smb_hdr) - 4 + 2);
36 in_buf->Command = SMB_COM_NT_CANCEL;
37 in_buf->WordCount = 0;
38 put_bcc(0, in_buf);
39
40 mutex_lock(&server->srv_mutex);
41 rc = cifs_sign_smb(in_buf, server, &mid->sequence_number);
42 if (rc) {
43 mutex_unlock(&server->srv_mutex);
44 return rc;
45 }
46
47 /*
48 * The response to this call was already factored into the sequence
49 * number when the call went out, so we must adjust it back downward
50 * after signing here.
51 */
52 --server->sequence_number;
53 rc = smb_send(server, in_buf, be32_to_cpu(in_buf->smb_buf_length));
54 if (rc < 0)
55 server->sequence_number--;
56
57 mutex_unlock(&server->srv_mutex);
58
59 cifs_dbg(FYI, "issued NT_CANCEL for mid %u, rc = %d\n",
60 get_mid(in_buf), rc);
61
62 return rc;
63}
64
65static bool
66cifs_compare_fids(struct cifsFileInfo *ob1, struct cifsFileInfo *ob2)
67{
68 return ob1->fid.netfid == ob2->fid.netfid;
69}
70
71static unsigned int
72cifs_read_data_offset(char *buf)
73{
74 READ_RSP *rsp = (READ_RSP *)buf;
75 return le16_to_cpu(rsp->DataOffset);
76}
77
78static unsigned int
79cifs_read_data_length(char *buf, bool in_remaining)
80{
81 READ_RSP *rsp = (READ_RSP *)buf;
82 /* It's a bug reading remaining data for SMB1 packets */
83 WARN_ON(in_remaining);
84 return (le16_to_cpu(rsp->DataLengthHigh) << 16) +
85 le16_to_cpu(rsp->DataLength);
86}
87
88static struct mid_q_entry *
89cifs_find_mid(struct TCP_Server_Info *server, char *buffer)
90{
91 struct smb_hdr *buf = (struct smb_hdr *)buffer;
92 struct mid_q_entry *mid;
93
94 spin_lock(&GlobalMid_Lock);
95 list_for_each_entry(mid, &server->pending_mid_q, qhead) {
96 if (compare_mid(mid->mid, buf) &&
97 mid->mid_state == MID_REQUEST_SUBMITTED &&
98 le16_to_cpu(mid->command) == buf->Command) {
99 kref_get(&mid->refcount);
100 spin_unlock(&GlobalMid_Lock);
101 return mid;
102 }
103 }
104 spin_unlock(&GlobalMid_Lock);
105 return NULL;
106}
107
108static void
109cifs_add_credits(struct TCP_Server_Info *server,
110 const struct cifs_credits *credits, const int optype)
111{
112 spin_lock(&server->req_lock);
113 server->credits += credits->value;
114 server->in_flight--;
115 spin_unlock(&server->req_lock);
116 wake_up(&server->request_q);
117}
118
119static void
120cifs_set_credits(struct TCP_Server_Info *server, const int val)
121{
122 spin_lock(&server->req_lock);
123 server->credits = val;
124 server->oplocks = val > 1 ? enable_oplocks : false;
125 spin_unlock(&server->req_lock);
126}
127
128static int *
129cifs_get_credits_field(struct TCP_Server_Info *server, const int optype)
130{
131 return &server->credits;
132}
133
134static unsigned int
135cifs_get_credits(struct mid_q_entry *mid)
136{
137 return 1;
138}
139
140/*
141 * Find a free multiplex id (SMB mid). Otherwise there could be
142 * mid collisions which might cause problems, demultiplexing the
143 * wrong response to this request. Multiplex ids could collide if
144 * one of a series requests takes much longer than the others, or
145 * if a very large number of long lived requests (byte range
146 * locks or FindNotify requests) are pending. No more than
147 * 64K-1 requests can be outstanding at one time. If no
148 * mids are available, return zero. A future optimization
149 * could make the combination of mids and uid the key we use
150 * to demultiplex on (rather than mid alone).
151 * In addition to the above check, the cifs demultiplex
152 * code already used the command code as a secondary
153 * check of the frame and if signing is negotiated the
154 * response would be discarded if the mid were the same
155 * but the signature was wrong. Since the mid is not put in the
156 * pending queue until later (when it is about to be dispatched)
157 * we do have to limit the number of outstanding requests
158 * to somewhat less than 64K-1 although it is hard to imagine
159 * so many threads being in the vfs at one time.
160 */
161static __u64
162cifs_get_next_mid(struct TCP_Server_Info *server)
163{
164 __u64 mid = 0;
165 __u16 last_mid, cur_mid;
166 bool collision;
167
168 spin_lock(&GlobalMid_Lock);
169
170 /* mid is 16 bit only for CIFS/SMB */
171 cur_mid = (__u16)((server->CurrentMid) & 0xffff);
172 /* we do not want to loop forever */
173 last_mid = cur_mid;
174 cur_mid++;
175 /* avoid 0xFFFF MID */
176 if (cur_mid == 0xffff)
177 cur_mid++;
178
179 /*
180 * This nested loop looks more expensive than it is.
181 * In practice the list of pending requests is short,
182 * fewer than 50, and the mids are likely to be unique
183 * on the first pass through the loop unless some request
184 * takes longer than the 64 thousand requests before it
185 * (and it would also have to have been a request that
186 * did not time out).
187 */
188 while (cur_mid != last_mid) {
189 struct mid_q_entry *mid_entry;
190 unsigned int num_mids;
191
192 collision = false;
193 if (cur_mid == 0)
194 cur_mid++;
195
196 num_mids = 0;
197 list_for_each_entry(mid_entry, &server->pending_mid_q, qhead) {
198 ++num_mids;
199 if (mid_entry->mid == cur_mid &&
200 mid_entry->mid_state == MID_REQUEST_SUBMITTED) {
201 /* This mid is in use, try a different one */
202 collision = true;
203 break;
204 }
205 }
206
207 /*
208 * if we have more than 32k mids in the list, then something
209 * is very wrong. Possibly a local user is trying to DoS the
210 * box by issuing long-running calls and SIGKILL'ing them. If
211 * we get to 2^16 mids then we're in big trouble as this
212 * function could loop forever.
213 *
214 * Go ahead and assign out the mid in this situation, but force
215 * an eventual reconnect to clean out the pending_mid_q.
216 */
217 if (num_mids > 32768)
218 server->tcpStatus = CifsNeedReconnect;
219
220 if (!collision) {
221 mid = (__u64)cur_mid;
222 server->CurrentMid = mid;
223 break;
224 }
225 cur_mid++;
226 }
227 spin_unlock(&GlobalMid_Lock);
228 return mid;
229}
230
231/*
232 return codes:
233 0 not a transact2, or all data present
234 >0 transact2 with that much data missing
235 -EINVAL invalid transact2
236 */
237static int
238check2ndT2(char *buf)
239{
240 struct smb_hdr *pSMB = (struct smb_hdr *)buf;
241 struct smb_t2_rsp *pSMBt;
242 int remaining;
243 __u16 total_data_size, data_in_this_rsp;
244
245 if (pSMB->Command != SMB_COM_TRANSACTION2)
246 return 0;
247
248 /* check for plausible wct, bcc and t2 data and parm sizes */
249 /* check for parm and data offset going beyond end of smb */
250 if (pSMB->WordCount != 10) { /* coalesce_t2 depends on this */
251 cifs_dbg(FYI, "Invalid transact2 word count\n");
252 return -EINVAL;
253 }
254
255 pSMBt = (struct smb_t2_rsp *)pSMB;
256
257 total_data_size = get_unaligned_le16(&pSMBt->t2_rsp.TotalDataCount);
258 data_in_this_rsp = get_unaligned_le16(&pSMBt->t2_rsp.DataCount);
259
260 if (total_data_size == data_in_this_rsp)
261 return 0;
262 else if (total_data_size < data_in_this_rsp) {
263 cifs_dbg(FYI, "total data %d smaller than data in frame %d\n",
264 total_data_size, data_in_this_rsp);
265 return -EINVAL;
266 }
267
268 remaining = total_data_size - data_in_this_rsp;
269
270 cifs_dbg(FYI, "missing %d bytes from transact2, check next response\n",
271 remaining);
272 if (total_data_size > CIFSMaxBufSize) {
273 cifs_dbg(VFS, "TotalDataSize %d is over maximum buffer %d\n",
274 total_data_size, CIFSMaxBufSize);
275 return -EINVAL;
276 }
277 return remaining;
278}
279
280static int
281coalesce_t2(char *second_buf, struct smb_hdr *target_hdr)
282{
283 struct smb_t2_rsp *pSMBs = (struct smb_t2_rsp *)second_buf;
284 struct smb_t2_rsp *pSMBt = (struct smb_t2_rsp *)target_hdr;
285 char *data_area_of_tgt;
286 char *data_area_of_src;
287 int remaining;
288 unsigned int byte_count, total_in_tgt;
289 __u16 tgt_total_cnt, src_total_cnt, total_in_src;
290
291 src_total_cnt = get_unaligned_le16(&pSMBs->t2_rsp.TotalDataCount);
292 tgt_total_cnt = get_unaligned_le16(&pSMBt->t2_rsp.TotalDataCount);
293
294 if (tgt_total_cnt != src_total_cnt)
295 cifs_dbg(FYI, "total data count of primary and secondary t2 differ source=%hu target=%hu\n",
296 src_total_cnt, tgt_total_cnt);
297
298 total_in_tgt = get_unaligned_le16(&pSMBt->t2_rsp.DataCount);
299
300 remaining = tgt_total_cnt - total_in_tgt;
301
302 if (remaining < 0) {
303 cifs_dbg(FYI, "Server sent too much data. tgt_total_cnt=%hu total_in_tgt=%u\n",
304 tgt_total_cnt, total_in_tgt);
305 return -EPROTO;
306 }
307
308 if (remaining == 0) {
309 /* nothing to do, ignore */
310 cifs_dbg(FYI, "no more data remains\n");
311 return 0;
312 }
313
314 total_in_src = get_unaligned_le16(&pSMBs->t2_rsp.DataCount);
315 if (remaining < total_in_src)
316 cifs_dbg(FYI, "transact2 2nd response contains too much data\n");
317
318 /* find end of first SMB data area */
319 data_area_of_tgt = (char *)&pSMBt->hdr.Protocol +
320 get_unaligned_le16(&pSMBt->t2_rsp.DataOffset);
321
322 /* validate target area */
323 data_area_of_src = (char *)&pSMBs->hdr.Protocol +
324 get_unaligned_le16(&pSMBs->t2_rsp.DataOffset);
325
326 data_area_of_tgt += total_in_tgt;
327
328 total_in_tgt += total_in_src;
329 /* is the result too big for the field? */
330 if (total_in_tgt > USHRT_MAX) {
331 cifs_dbg(FYI, "coalesced DataCount too large (%u)\n",
332 total_in_tgt);
333 return -EPROTO;
334 }
335 put_unaligned_le16(total_in_tgt, &pSMBt->t2_rsp.DataCount);
336
337 /* fix up the BCC */
338 byte_count = get_bcc(target_hdr);
339 byte_count += total_in_src;
340 /* is the result too big for the field? */
341 if (byte_count > USHRT_MAX) {
342 cifs_dbg(FYI, "coalesced BCC too large (%u)\n", byte_count);
343 return -EPROTO;
344 }
345 put_bcc(byte_count, target_hdr);
346
347 byte_count = be32_to_cpu(target_hdr->smb_buf_length);
348 byte_count += total_in_src;
349 /* don't allow buffer to overflow */
350 if (byte_count > CIFSMaxBufSize + MAX_CIFS_HDR_SIZE - 4) {
351 cifs_dbg(FYI, "coalesced BCC exceeds buffer size (%u)\n",
352 byte_count);
353 return -ENOBUFS;
354 }
355 target_hdr->smb_buf_length = cpu_to_be32(byte_count);
356
357 /* copy second buffer into end of first buffer */
358 memcpy(data_area_of_tgt, data_area_of_src, total_in_src);
359
360 if (remaining != total_in_src) {
361 /* more responses to go */
362 cifs_dbg(FYI, "waiting for more secondary responses\n");
363 return 1;
364 }
365
366 /* we are done */
367 cifs_dbg(FYI, "found the last secondary response\n");
368 return 0;
369}
370
371static void
372cifs_downgrade_oplock(struct TCP_Server_Info *server,
373 struct cifsInodeInfo *cinode, __u32 oplock,
374 unsigned int epoch, bool *purge_cache)
375{
376 cifs_set_oplock_level(cinode, oplock);
377}
378
379static bool
380cifs_check_trans2(struct mid_q_entry *mid, struct TCP_Server_Info *server,
381 char *buf, int malformed)
382{
383 if (malformed)
384 return false;
385 if (check2ndT2(buf) <= 0)
386 return false;
387 mid->multiRsp = true;
388 if (mid->resp_buf) {
389 /* merge response - fix up 1st*/
390 malformed = coalesce_t2(buf, mid->resp_buf);
391 if (malformed > 0)
392 return true;
393 /* All parts received or packet is malformed. */
394 mid->multiEnd = true;
395 dequeue_mid(mid, malformed);
396 return true;
397 }
398 if (!server->large_buf) {
399 /*FIXME: switch to already allocated largebuf?*/
400 cifs_dbg(VFS, "1st trans2 resp needs bigbuf\n");
401 } else {
402 /* Have first buffer */
403 mid->resp_buf = buf;
404 mid->large_buf = true;
405 server->bigbuf = NULL;
406 }
407 return true;
408}
409
410static bool
411cifs_need_neg(struct TCP_Server_Info *server)
412{
413 return server->maxBuf == 0;
414}
415
416static int
417cifs_negotiate(const unsigned int xid, struct cifs_ses *ses)
418{
419 int rc;
420 rc = CIFSSMBNegotiate(xid, ses);
421 if (rc == -EAGAIN) {
422 /* retry only once on 1st time connection */
423 set_credits(ses->server, 1);
424 rc = CIFSSMBNegotiate(xid, ses);
425 if (rc == -EAGAIN)
426 rc = -EHOSTDOWN;
427 }
428 return rc;
429}
430
431static unsigned int
432cifs_negotiate_wsize(struct cifs_tcon *tcon, struct smb3_fs_context *ctx)
433{
434 __u64 unix_cap = le64_to_cpu(tcon->fsUnixInfo.Capability);
435 struct TCP_Server_Info *server = tcon->ses->server;
436 unsigned int wsize;
437
438 /* start with specified wsize, or default */
439 if (ctx->wsize)
440 wsize = ctx->wsize;
441 else if (tcon->unix_ext && (unix_cap & CIFS_UNIX_LARGE_WRITE_CAP))
442 wsize = CIFS_DEFAULT_IOSIZE;
443 else
444 wsize = CIFS_DEFAULT_NON_POSIX_WSIZE;
445
446 /* can server support 24-bit write sizes? (via UNIX extensions) */
447 if (!tcon->unix_ext || !(unix_cap & CIFS_UNIX_LARGE_WRITE_CAP))
448 wsize = min_t(unsigned int, wsize, CIFS_MAX_RFC1002_WSIZE);
449
450 /*
451 * no CAP_LARGE_WRITE_X or is signing enabled without CAP_UNIX set?
452 * Limit it to max buffer offered by the server, minus the size of the
453 * WRITEX header, not including the 4 byte RFC1001 length.
454 */
455 if (!(server->capabilities & CAP_LARGE_WRITE_X) ||
456 (!(server->capabilities & CAP_UNIX) && server->sign))
457 wsize = min_t(unsigned int, wsize,
458 server->maxBuf - sizeof(WRITE_REQ) + 4);
459
460 /* hard limit of CIFS_MAX_WSIZE */
461 wsize = min_t(unsigned int, wsize, CIFS_MAX_WSIZE);
462
463 return wsize;
464}
465
466static unsigned int
467cifs_negotiate_rsize(struct cifs_tcon *tcon, struct smb3_fs_context *ctx)
468{
469 __u64 unix_cap = le64_to_cpu(tcon->fsUnixInfo.Capability);
470 struct TCP_Server_Info *server = tcon->ses->server;
471 unsigned int rsize, defsize;
472
473 /*
474 * Set default value...
475 *
476 * HACK alert! Ancient servers have very small buffers. Even though
477 * MS-CIFS indicates that servers are only limited by the client's
478 * bufsize for reads, testing against win98se shows that it throws
479 * INVALID_PARAMETER errors if you try to request too large a read.
480 * OS/2 just sends back short reads.
481 *
482 * If the server doesn't advertise CAP_LARGE_READ_X, then assume that
483 * it can't handle a read request larger than its MaxBufferSize either.
484 */
485 if (tcon->unix_ext && (unix_cap & CIFS_UNIX_LARGE_READ_CAP))
486 defsize = CIFS_DEFAULT_IOSIZE;
487 else if (server->capabilities & CAP_LARGE_READ_X)
488 defsize = CIFS_DEFAULT_NON_POSIX_RSIZE;
489 else
490 defsize = server->maxBuf - sizeof(READ_RSP);
491
492 rsize = ctx->rsize ? ctx->rsize : defsize;
493
494 /*
495 * no CAP_LARGE_READ_X? Then MS-CIFS states that we must limit this to
496 * the client's MaxBufferSize.
497 */
498 if (!(server->capabilities & CAP_LARGE_READ_X))
499 rsize = min_t(unsigned int, CIFSMaxBufSize, rsize);
500
501 /* hard limit of CIFS_MAX_RSIZE */
502 rsize = min_t(unsigned int, rsize, CIFS_MAX_RSIZE);
503
504 return rsize;
505}
506
507static void
508cifs_qfs_tcon(const unsigned int xid, struct cifs_tcon *tcon,
509 struct cifs_sb_info *cifs_sb)
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 = cifs_create_options(cifs_sb, 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_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, FIND_WR_FSUID_ONLY);
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_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 = cifs_create_options(cifs_sb, 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 cifs_sb_info *cifs_sb, 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 = kstrdup(referral.node_name, GFP_KERNEL);
930 free_dfs_info_param(&referral);
931 if (!*symlinkinfo)
932 rc = -ENOMEM;
933 }
934 return rc;
935#else /* No DFS support */
936 return -EREMOTE;
937#endif
938}
939
940static int
941cifs_query_symlink(const unsigned int xid, struct cifs_tcon *tcon,
942 struct cifs_sb_info *cifs_sb, const char *full_path,
943 char **target_path, bool is_reparse_point)
944{
945 int rc;
946 int oplock = 0;
947 struct cifs_fid fid;
948 struct cifs_open_parms oparms;
949
950 cifs_dbg(FYI, "%s: path: %s\n", __func__, full_path);
951
952 if (is_reparse_point) {
953 cifs_dbg(VFS, "reparse points not handled for SMB1 symlinks\n");
954 return -EOPNOTSUPP;
955 }
956
957 /* Check for unix extensions */
958 if (cap_unix(tcon->ses)) {
959 rc = CIFSSMBUnixQuerySymLink(xid, tcon, full_path, target_path,
960 cifs_sb->local_nls,
961 cifs_remap(cifs_sb));
962 if (rc == -EREMOTE)
963 rc = cifs_unix_dfs_readlink(xid, tcon, full_path,
964 target_path,
965 cifs_sb->local_nls);
966
967 goto out;
968 }
969
970 oparms.tcon = tcon;
971 oparms.cifs_sb = cifs_sb;
972 oparms.desired_access = FILE_READ_ATTRIBUTES;
973 oparms.create_options = cifs_create_options(cifs_sb,
974 OPEN_REPARSE_POINT);
975 oparms.disposition = FILE_OPEN;
976 oparms.path = full_path;
977 oparms.fid = &fid;
978 oparms.reconnect = false;
979
980 rc = CIFS_open(xid, &oparms, &oplock, NULL);
981 if (rc)
982 goto out;
983
984 rc = CIFSSMBQuerySymLink(xid, tcon, fid.netfid, target_path,
985 cifs_sb->local_nls);
986 if (rc)
987 goto out_close;
988
989 convert_delimiter(*target_path, '/');
990out_close:
991 CIFSSMBClose(xid, tcon, fid.netfid);
992out:
993 if (!rc)
994 cifs_dbg(FYI, "%s: target path: %s\n", __func__, *target_path);
995 return rc;
996}
997
998static bool
999cifs_is_read_op(__u32 oplock)
1000{
1001 return oplock == OPLOCK_READ;
1002}
1003
1004static unsigned int
1005cifs_wp_retry_size(struct inode *inode)
1006{
1007 return CIFS_SB(inode->i_sb)->ctx->wsize;
1008}
1009
1010static bool
1011cifs_dir_needs_close(struct cifsFileInfo *cfile)
1012{
1013 return !cfile->srch_inf.endOfSearch && !cfile->invalidHandle;
1014}
1015
1016static bool
1017cifs_can_echo(struct TCP_Server_Info *server)
1018{
1019 if (server->tcpStatus == CifsGood)
1020 return true;
1021
1022 return false;
1023}
1024
1025static int
1026cifs_make_node(unsigned int xid, struct inode *inode,
1027 struct dentry *dentry, struct cifs_tcon *tcon,
1028 const char *full_path, umode_t mode, dev_t dev)
1029{
1030 struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
1031 struct inode *newinode = NULL;
1032 int rc = -EPERM;
1033 FILE_ALL_INFO *buf = NULL;
1034 struct cifs_io_parms io_parms;
1035 __u32 oplock = 0;
1036 struct cifs_fid fid;
1037 struct cifs_open_parms oparms;
1038 unsigned int bytes_written;
1039 struct win_dev *pdev;
1040 struct kvec iov[2];
1041
1042 if (tcon->unix_ext) {
1043 /*
1044 * SMB1 Unix Extensions: requires server support but
1045 * works with all special files
1046 */
1047 struct cifs_unix_set_info_args args = {
1048 .mode = mode & ~current_umask(),
1049 .ctime = NO_CHANGE_64,
1050 .atime = NO_CHANGE_64,
1051 .mtime = NO_CHANGE_64,
1052 .device = dev,
1053 };
1054 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SET_UID) {
1055 args.uid = current_fsuid();
1056 args.gid = current_fsgid();
1057 } else {
1058 args.uid = INVALID_UID; /* no change */
1059 args.gid = INVALID_GID; /* no change */
1060 }
1061 rc = CIFSSMBUnixSetPathInfo(xid, tcon, full_path, &args,
1062 cifs_sb->local_nls,
1063 cifs_remap(cifs_sb));
1064 if (rc)
1065 goto out;
1066
1067 rc = cifs_get_inode_info_unix(&newinode, full_path,
1068 inode->i_sb, xid);
1069
1070 if (rc == 0)
1071 d_instantiate(dentry, newinode);
1072 goto out;
1073 }
1074
1075 /*
1076 * SMB1 SFU emulation: should work with all servers, but only
1077 * support block and char device (no socket & fifo)
1078 */
1079 if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_UNX_EMUL))
1080 goto out;
1081
1082 if (!S_ISCHR(mode) && !S_ISBLK(mode))
1083 goto out;
1084
1085 cifs_dbg(FYI, "sfu compat create special file\n");
1086
1087 buf = kmalloc(sizeof(FILE_ALL_INFO), GFP_KERNEL);
1088 if (buf == NULL) {
1089 rc = -ENOMEM;
1090 goto out;
1091 }
1092
1093 oparms.tcon = tcon;
1094 oparms.cifs_sb = cifs_sb;
1095 oparms.desired_access = GENERIC_WRITE;
1096 oparms.create_options = cifs_create_options(cifs_sb, CREATE_NOT_DIR |
1097 CREATE_OPTION_SPECIAL);
1098 oparms.disposition = FILE_CREATE;
1099 oparms.path = full_path;
1100 oparms.fid = &fid;
1101 oparms.reconnect = false;
1102
1103 if (tcon->ses->server->oplocks)
1104 oplock = REQ_OPLOCK;
1105 else
1106 oplock = 0;
1107 rc = tcon->ses->server->ops->open(xid, &oparms, &oplock, buf);
1108 if (rc)
1109 goto out;
1110
1111 /*
1112 * BB Do not bother to decode buf since no local inode yet to put
1113 * timestamps in, but we can reuse it safely.
1114 */
1115
1116 pdev = (struct win_dev *)buf;
1117 io_parms.pid = current->tgid;
1118 io_parms.tcon = tcon;
1119 io_parms.offset = 0;
1120 io_parms.length = sizeof(struct win_dev);
1121 iov[1].iov_base = buf;
1122 iov[1].iov_len = sizeof(struct win_dev);
1123 if (S_ISCHR(mode)) {
1124 memcpy(pdev->type, "IntxCHR", 8);
1125 pdev->major = cpu_to_le64(MAJOR(dev));
1126 pdev->minor = cpu_to_le64(MINOR(dev));
1127 rc = tcon->ses->server->ops->sync_write(xid, &fid, &io_parms,
1128 &bytes_written, iov, 1);
1129 } else if (S_ISBLK(mode)) {
1130 memcpy(pdev->type, "IntxBLK", 8);
1131 pdev->major = cpu_to_le64(MAJOR(dev));
1132 pdev->minor = cpu_to_le64(MINOR(dev));
1133 rc = tcon->ses->server->ops->sync_write(xid, &fid, &io_parms,
1134 &bytes_written, iov, 1);
1135 }
1136 tcon->ses->server->ops->close(xid, tcon, &fid);
1137 d_drop(dentry);
1138
1139 /* FIXME: add code here to set EAs */
1140out:
1141 kfree(buf);
1142 return rc;
1143}
1144
1145
1146
1147struct smb_version_operations smb1_operations = {
1148 .send_cancel = send_nt_cancel,
1149 .compare_fids = cifs_compare_fids,
1150 .setup_request = cifs_setup_request,
1151 .setup_async_request = cifs_setup_async_request,
1152 .check_receive = cifs_check_receive,
1153 .add_credits = cifs_add_credits,
1154 .set_credits = cifs_set_credits,
1155 .get_credits_field = cifs_get_credits_field,
1156 .get_credits = cifs_get_credits,
1157 .wait_mtu_credits = cifs_wait_mtu_credits,
1158 .get_next_mid = cifs_get_next_mid,
1159 .read_data_offset = cifs_read_data_offset,
1160 .read_data_length = cifs_read_data_length,
1161 .map_error = map_smb_to_linux_error,
1162 .find_mid = cifs_find_mid,
1163 .check_message = checkSMB,
1164 .dump_detail = cifs_dump_detail,
1165 .clear_stats = cifs_clear_stats,
1166 .print_stats = cifs_print_stats,
1167 .is_oplock_break = is_valid_oplock_break,
1168 .downgrade_oplock = cifs_downgrade_oplock,
1169 .check_trans2 = cifs_check_trans2,
1170 .need_neg = cifs_need_neg,
1171 .negotiate = cifs_negotiate,
1172 .negotiate_wsize = cifs_negotiate_wsize,
1173 .negotiate_rsize = cifs_negotiate_rsize,
1174 .sess_setup = CIFS_SessSetup,
1175 .logoff = CIFSSMBLogoff,
1176 .tree_connect = CIFSTCon,
1177 .tree_disconnect = CIFSSMBTDis,
1178 .get_dfs_refer = CIFSGetDFSRefer,
1179 .qfs_tcon = cifs_qfs_tcon,
1180 .is_path_accessible = cifs_is_path_accessible,
1181 .can_echo = cifs_can_echo,
1182 .query_path_info = cifs_query_path_info,
1183 .query_file_info = cifs_query_file_info,
1184 .get_srv_inum = cifs_get_srv_inum,
1185 .set_path_size = CIFSSMBSetEOF,
1186 .set_file_size = CIFSSMBSetFileSize,
1187 .set_file_info = smb_set_file_info,
1188 .set_compression = cifs_set_compression,
1189 .echo = CIFSSMBEcho,
1190 .mkdir = CIFSSMBMkDir,
1191 .mkdir_setinfo = cifs_mkdir_setinfo,
1192 .rmdir = CIFSSMBRmDir,
1193 .unlink = CIFSSMBDelFile,
1194 .rename_pending_delete = cifs_rename_pending_delete,
1195 .rename = CIFSSMBRename,
1196 .create_hardlink = CIFSCreateHardLink,
1197 .query_symlink = cifs_query_symlink,
1198 .open = cifs_open_file,
1199 .set_fid = cifs_set_fid,
1200 .close = cifs_close_file,
1201 .flush = cifs_flush_file,
1202 .async_readv = cifs_async_readv,
1203 .async_writev = cifs_async_writev,
1204 .sync_read = cifs_sync_read,
1205 .sync_write = cifs_sync_write,
1206 .query_dir_first = cifs_query_dir_first,
1207 .query_dir_next = cifs_query_dir_next,
1208 .close_dir = cifs_close_dir,
1209 .calc_smb_size = smbCalcSize,
1210 .oplock_response = cifs_oplock_response,
1211 .queryfs = cifs_queryfs,
1212 .mand_lock = cifs_mand_lock,
1213 .mand_unlock_range = cifs_unlock_range,
1214 .push_mand_locks = cifs_push_mandatory_locks,
1215 .query_mf_symlink = cifs_query_mf_symlink,
1216 .create_mf_symlink = cifs_create_mf_symlink,
1217 .is_read_op = cifs_is_read_op,
1218 .wp_retry_size = cifs_wp_retry_size,
1219 .dir_needs_close = cifs_dir_needs_close,
1220 .select_sectype = cifs_select_sectype,
1221#ifdef CONFIG_CIFS_XATTR
1222 .query_all_EAs = CIFSSMBQAllEAs,
1223 .set_EA = CIFSSMBSetEA,
1224#endif /* CIFS_XATTR */
1225 .get_acl = get_cifs_acl,
1226 .get_acl_by_fid = get_cifs_acl_by_fid,
1227 .set_acl = set_cifs_acl,
1228 .make_node = cifs_make_node,
1229};
1230
1231struct smb_version_values smb1_values = {
1232 .version_string = SMB1_VERSION_STRING,
1233 .protocol_id = SMB10_PROT_ID,
1234 .large_lock_type = LOCKING_ANDX_LARGE_FILES,
1235 .exclusive_lock_type = 0,
1236 .shared_lock_type = LOCKING_ANDX_SHARED_LOCK,
1237 .unlock_lock_type = 0,
1238 .header_preamble_size = 4,
1239 .header_size = sizeof(struct smb_hdr),
1240 .max_header_size = MAX_CIFS_HDR_SIZE,
1241 .read_rsp_size = sizeof(READ_RSP),
1242 .lock_cmd = cpu_to_le16(SMB_COM_LOCKING_ANDX),
1243 .cap_unix = CAP_UNIX,
1244 .cap_nt_find = CAP_NT_SMBS | CAP_NT_FIND,
1245 .cap_large_files = CAP_LARGE_FILES,
1246 .signing_enabled = SECMODE_SIGN_ENABLED,
1247 .signing_required = SECMODE_SIGN_REQUIRED,
1248};
1/*
2 * SMB1 (CIFS) version specific operations
3 *
4 * Copyright (c) 2012, Jeff Layton <jlayton@redhat.com>
5 *
6 * This library is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License v2 as published
8 * by the Free Software Foundation.
9 *
10 * This library is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See
13 * the GNU Lesser General Public License for more details.
14 *
15 * You should have received a copy of the GNU Lesser General Public License
16 * along with this library; if not, write to the Free Software
17 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
18 */
19
20#include <linux/pagemap.h>
21#include <linux/vfs.h>
22#include "cifsglob.h"
23#include "cifsproto.h"
24#include "cifs_debug.h"
25#include "cifspdu.h"
26#include "cifs_unicode.h"
27
28/*
29 * An NT cancel request header looks just like the original request except:
30 *
31 * The Command is SMB_COM_NT_CANCEL
32 * The WordCount is zeroed out
33 * The ByteCount is zeroed out
34 *
35 * This function mangles an existing request buffer into a
36 * SMB_COM_NT_CANCEL request and then sends it.
37 */
38static int
39send_nt_cancel(struct TCP_Server_Info *server, void *buf,
40 struct mid_q_entry *mid)
41{
42 int rc = 0;
43 struct smb_hdr *in_buf = (struct smb_hdr *)buf;
44
45 /* -4 for RFC1001 length and +2 for BCC field */
46 in_buf->smb_buf_length = cpu_to_be32(sizeof(struct smb_hdr) - 4 + 2);
47 in_buf->Command = SMB_COM_NT_CANCEL;
48 in_buf->WordCount = 0;
49 put_bcc(0, in_buf);
50
51 mutex_lock(&server->srv_mutex);
52 rc = cifs_sign_smb(in_buf, server, &mid->sequence_number);
53 if (rc) {
54 mutex_unlock(&server->srv_mutex);
55 return rc;
56 }
57
58 /*
59 * The response to this call was already factored into the sequence
60 * number when the call went out, so we must adjust it back downward
61 * after signing here.
62 */
63 --server->sequence_number;
64 rc = smb_send(server, in_buf, be32_to_cpu(in_buf->smb_buf_length));
65 if (rc < 0)
66 server->sequence_number--;
67
68 mutex_unlock(&server->srv_mutex);
69
70 cifs_dbg(FYI, "issued NT_CANCEL for mid %u, rc = %d\n",
71 get_mid(in_buf), rc);
72
73 return rc;
74}
75
76static bool
77cifs_compare_fids(struct cifsFileInfo *ob1, struct cifsFileInfo *ob2)
78{
79 return ob1->fid.netfid == ob2->fid.netfid;
80}
81
82static unsigned int
83cifs_read_data_offset(char *buf)
84{
85 READ_RSP *rsp = (READ_RSP *)buf;
86 return le16_to_cpu(rsp->DataOffset);
87}
88
89static unsigned int
90cifs_read_data_length(char *buf)
91{
92 READ_RSP *rsp = (READ_RSP *)buf;
93 return (le16_to_cpu(rsp->DataLengthHigh) << 16) +
94 le16_to_cpu(rsp->DataLength);
95}
96
97static struct mid_q_entry *
98cifs_find_mid(struct TCP_Server_Info *server, char *buffer)
99{
100 struct smb_hdr *buf = (struct smb_hdr *)buffer;
101 struct mid_q_entry *mid;
102
103 spin_lock(&GlobalMid_Lock);
104 list_for_each_entry(mid, &server->pending_mid_q, qhead) {
105 if (compare_mid(mid->mid, buf) &&
106 mid->mid_state == MID_REQUEST_SUBMITTED &&
107 le16_to_cpu(mid->command) == buf->Command) {
108 spin_unlock(&GlobalMid_Lock);
109 return mid;
110 }
111 }
112 spin_unlock(&GlobalMid_Lock);
113 return NULL;
114}
115
116static void
117cifs_add_credits(struct TCP_Server_Info *server, const unsigned int add,
118 const int optype)
119{
120 spin_lock(&server->req_lock);
121 server->credits += add;
122 server->in_flight--;
123 spin_unlock(&server->req_lock);
124 wake_up(&server->request_q);
125}
126
127static void
128cifs_set_credits(struct TCP_Server_Info *server, const int val)
129{
130 spin_lock(&server->req_lock);
131 server->credits = val;
132 server->oplocks = val > 1 ? enable_oplocks : false;
133 spin_unlock(&server->req_lock);
134}
135
136static int *
137cifs_get_credits_field(struct TCP_Server_Info *server, const int optype)
138{
139 return &server->credits;
140}
141
142static unsigned int
143cifs_get_credits(struct mid_q_entry *mid)
144{
145 return 1;
146}
147
148/*
149 * Find a free multiplex id (SMB mid). Otherwise there could be
150 * mid collisions which might cause problems, demultiplexing the
151 * wrong response to this request. Multiplex ids could collide if
152 * one of a series requests takes much longer than the others, or
153 * if a very large number of long lived requests (byte range
154 * locks or FindNotify requests) are pending. No more than
155 * 64K-1 requests can be outstanding at one time. If no
156 * mids are available, return zero. A future optimization
157 * could make the combination of mids and uid the key we use
158 * to demultiplex on (rather than mid alone).
159 * In addition to the above check, the cifs demultiplex
160 * code already used the command code as a secondary
161 * check of the frame and if signing is negotiated the
162 * response would be discarded if the mid were the same
163 * but the signature was wrong. Since the mid is not put in the
164 * pending queue until later (when it is about to be dispatched)
165 * we do have to limit the number of outstanding requests
166 * to somewhat less than 64K-1 although it is hard to imagine
167 * so many threads being in the vfs at one time.
168 */
169static __u64
170cifs_get_next_mid(struct TCP_Server_Info *server)
171{
172 __u64 mid = 0;
173 __u16 last_mid, cur_mid;
174 bool collision;
175
176 spin_lock(&GlobalMid_Lock);
177
178 /* mid is 16 bit only for CIFS/SMB */
179 cur_mid = (__u16)((server->CurrentMid) & 0xffff);
180 /* we do not want to loop forever */
181 last_mid = cur_mid;
182 cur_mid++;
183
184 /*
185 * This nested loop looks more expensive than it is.
186 * In practice the list of pending requests is short,
187 * fewer than 50, and the mids are likely to be unique
188 * on the first pass through the loop unless some request
189 * takes longer than the 64 thousand requests before it
190 * (and it would also have to have been a request that
191 * did not time out).
192 */
193 while (cur_mid != last_mid) {
194 struct mid_q_entry *mid_entry;
195 unsigned int num_mids;
196
197 collision = false;
198 if (cur_mid == 0)
199 cur_mid++;
200
201 num_mids = 0;
202 list_for_each_entry(mid_entry, &server->pending_mid_q, qhead) {
203 ++num_mids;
204 if (mid_entry->mid == cur_mid &&
205 mid_entry->mid_state == MID_REQUEST_SUBMITTED) {
206 /* This mid is in use, try a different one */
207 collision = true;
208 break;
209 }
210 }
211
212 /*
213 * if we have more than 32k mids in the list, then something
214 * is very wrong. Possibly a local user is trying to DoS the
215 * box by issuing long-running calls and SIGKILL'ing them. If
216 * we get to 2^16 mids then we're in big trouble as this
217 * function could loop forever.
218 *
219 * Go ahead and assign out the mid in this situation, but force
220 * an eventual reconnect to clean out the pending_mid_q.
221 */
222 if (num_mids > 32768)
223 server->tcpStatus = CifsNeedReconnect;
224
225 if (!collision) {
226 mid = (__u64)cur_mid;
227 server->CurrentMid = mid;
228 break;
229 }
230 cur_mid++;
231 }
232 spin_unlock(&GlobalMid_Lock);
233 return mid;
234}
235
236/*
237 return codes:
238 0 not a transact2, or all data present
239 >0 transact2 with that much data missing
240 -EINVAL invalid transact2
241 */
242static int
243check2ndT2(char *buf)
244{
245 struct smb_hdr *pSMB = (struct smb_hdr *)buf;
246 struct smb_t2_rsp *pSMBt;
247 int remaining;
248 __u16 total_data_size, data_in_this_rsp;
249
250 if (pSMB->Command != SMB_COM_TRANSACTION2)
251 return 0;
252
253 /* check for plausible wct, bcc and t2 data and parm sizes */
254 /* check for parm and data offset going beyond end of smb */
255 if (pSMB->WordCount != 10) { /* coalesce_t2 depends on this */
256 cifs_dbg(FYI, "invalid transact2 word count\n");
257 return -EINVAL;
258 }
259
260 pSMBt = (struct smb_t2_rsp *)pSMB;
261
262 total_data_size = get_unaligned_le16(&pSMBt->t2_rsp.TotalDataCount);
263 data_in_this_rsp = get_unaligned_le16(&pSMBt->t2_rsp.DataCount);
264
265 if (total_data_size == data_in_this_rsp)
266 return 0;
267 else if (total_data_size < data_in_this_rsp) {
268 cifs_dbg(FYI, "total data %d smaller than data in frame %d\n",
269 total_data_size, data_in_this_rsp);
270 return -EINVAL;
271 }
272
273 remaining = total_data_size - data_in_this_rsp;
274
275 cifs_dbg(FYI, "missing %d bytes from transact2, check next response\n",
276 remaining);
277 if (total_data_size > CIFSMaxBufSize) {
278 cifs_dbg(VFS, "TotalDataSize %d is over maximum buffer %d\n",
279 total_data_size, CIFSMaxBufSize);
280 return -EINVAL;
281 }
282 return remaining;
283}
284
285static int
286coalesce_t2(char *second_buf, struct smb_hdr *target_hdr)
287{
288 struct smb_t2_rsp *pSMBs = (struct smb_t2_rsp *)second_buf;
289 struct smb_t2_rsp *pSMBt = (struct smb_t2_rsp *)target_hdr;
290 char *data_area_of_tgt;
291 char *data_area_of_src;
292 int remaining;
293 unsigned int byte_count, total_in_tgt;
294 __u16 tgt_total_cnt, src_total_cnt, total_in_src;
295
296 src_total_cnt = get_unaligned_le16(&pSMBs->t2_rsp.TotalDataCount);
297 tgt_total_cnt = get_unaligned_le16(&pSMBt->t2_rsp.TotalDataCount);
298
299 if (tgt_total_cnt != src_total_cnt)
300 cifs_dbg(FYI, "total data count of primary and secondary t2 differ source=%hu target=%hu\n",
301 src_total_cnt, tgt_total_cnt);
302
303 total_in_tgt = get_unaligned_le16(&pSMBt->t2_rsp.DataCount);
304
305 remaining = tgt_total_cnt - total_in_tgt;
306
307 if (remaining < 0) {
308 cifs_dbg(FYI, "Server sent too much data. tgt_total_cnt=%hu total_in_tgt=%hu\n",
309 tgt_total_cnt, total_in_tgt);
310 return -EPROTO;
311 }
312
313 if (remaining == 0) {
314 /* nothing to do, ignore */
315 cifs_dbg(FYI, "no more data remains\n");
316 return 0;
317 }
318
319 total_in_src = get_unaligned_le16(&pSMBs->t2_rsp.DataCount);
320 if (remaining < total_in_src)
321 cifs_dbg(FYI, "transact2 2nd response contains too much data\n");
322
323 /* find end of first SMB data area */
324 data_area_of_tgt = (char *)&pSMBt->hdr.Protocol +
325 get_unaligned_le16(&pSMBt->t2_rsp.DataOffset);
326
327 /* validate target area */
328 data_area_of_src = (char *)&pSMBs->hdr.Protocol +
329 get_unaligned_le16(&pSMBs->t2_rsp.DataOffset);
330
331 data_area_of_tgt += total_in_tgt;
332
333 total_in_tgt += total_in_src;
334 /* is the result too big for the field? */
335 if (total_in_tgt > USHRT_MAX) {
336 cifs_dbg(FYI, "coalesced DataCount too large (%u)\n",
337 total_in_tgt);
338 return -EPROTO;
339 }
340 put_unaligned_le16(total_in_tgt, &pSMBt->t2_rsp.DataCount);
341
342 /* fix up the BCC */
343 byte_count = get_bcc(target_hdr);
344 byte_count += total_in_src;
345 /* is the result too big for the field? */
346 if (byte_count > USHRT_MAX) {
347 cifs_dbg(FYI, "coalesced BCC too large (%u)\n", byte_count);
348 return -EPROTO;
349 }
350 put_bcc(byte_count, target_hdr);
351
352 byte_count = be32_to_cpu(target_hdr->smb_buf_length);
353 byte_count += total_in_src;
354 /* don't allow buffer to overflow */
355 if (byte_count > CIFSMaxBufSize + MAX_CIFS_HDR_SIZE - 4) {
356 cifs_dbg(FYI, "coalesced BCC exceeds buffer size (%u)\n",
357 byte_count);
358 return -ENOBUFS;
359 }
360 target_hdr->smb_buf_length = cpu_to_be32(byte_count);
361
362 /* copy second buffer into end of first buffer */
363 memcpy(data_area_of_tgt, data_area_of_src, total_in_src);
364
365 if (remaining != total_in_src) {
366 /* more responses to go */
367 cifs_dbg(FYI, "waiting for more secondary responses\n");
368 return 1;
369 }
370
371 /* we are done */
372 cifs_dbg(FYI, "found the last secondary response\n");
373 return 0;
374}
375
376static void
377cifs_downgrade_oplock(struct TCP_Server_Info *server,
378 struct cifsInodeInfo *cinode, bool set_level2)
379{
380 if (set_level2)
381 cifs_set_oplock_level(cinode, OPLOCK_READ);
382 else
383 cifs_set_oplock_level(cinode, 0);
384}
385
386static bool
387cifs_check_trans2(struct mid_q_entry *mid, struct TCP_Server_Info *server,
388 char *buf, int malformed)
389{
390 if (malformed)
391 return false;
392 if (check2ndT2(buf) <= 0)
393 return false;
394 mid->multiRsp = true;
395 if (mid->resp_buf) {
396 /* merge response - fix up 1st*/
397 malformed = coalesce_t2(buf, mid->resp_buf);
398 if (malformed > 0)
399 return true;
400 /* All parts received or packet is malformed. */
401 mid->multiEnd = true;
402 dequeue_mid(mid, malformed);
403 return true;
404 }
405 if (!server->large_buf) {
406 /*FIXME: switch to already allocated largebuf?*/
407 cifs_dbg(VFS, "1st trans2 resp needs bigbuf\n");
408 } else {
409 /* Have first buffer */
410 mid->resp_buf = buf;
411 mid->large_buf = true;
412 server->bigbuf = NULL;
413 }
414 return true;
415}
416
417static bool
418cifs_need_neg(struct TCP_Server_Info *server)
419{
420 return server->maxBuf == 0;
421}
422
423static int
424cifs_negotiate(const unsigned int xid, struct cifs_ses *ses)
425{
426 int rc;
427 rc = CIFSSMBNegotiate(xid, ses);
428 if (rc == -EAGAIN) {
429 /* retry only once on 1st time connection */
430 set_credits(ses->server, 1);
431 rc = CIFSSMBNegotiate(xid, ses);
432 if (rc == -EAGAIN)
433 rc = -EHOSTDOWN;
434 }
435 return rc;
436}
437
438static unsigned int
439cifs_negotiate_wsize(struct cifs_tcon *tcon, struct smb_vol *volume_info)
440{
441 __u64 unix_cap = le64_to_cpu(tcon->fsUnixInfo.Capability);
442 struct TCP_Server_Info *server = tcon->ses->server;
443 unsigned int wsize;
444
445 /* start with specified wsize, or default */
446 if (volume_info->wsize)
447 wsize = volume_info->wsize;
448 else if (tcon->unix_ext && (unix_cap & CIFS_UNIX_LARGE_WRITE_CAP))
449 wsize = CIFS_DEFAULT_IOSIZE;
450 else
451 wsize = CIFS_DEFAULT_NON_POSIX_WSIZE;
452
453 /* can server support 24-bit write sizes? (via UNIX extensions) */
454 if (!tcon->unix_ext || !(unix_cap & CIFS_UNIX_LARGE_WRITE_CAP))
455 wsize = min_t(unsigned int, wsize, CIFS_MAX_RFC1002_WSIZE);
456
457 /*
458 * no CAP_LARGE_WRITE_X or is signing enabled without CAP_UNIX set?
459 * Limit it to max buffer offered by the server, minus the size of the
460 * WRITEX header, not including the 4 byte RFC1001 length.
461 */
462 if (!(server->capabilities & CAP_LARGE_WRITE_X) ||
463 (!(server->capabilities & CAP_UNIX) && server->sign))
464 wsize = min_t(unsigned int, wsize,
465 server->maxBuf - sizeof(WRITE_REQ) + 4);
466
467 /* hard limit of CIFS_MAX_WSIZE */
468 wsize = min_t(unsigned int, wsize, CIFS_MAX_WSIZE);
469
470 return wsize;
471}
472
473static unsigned int
474cifs_negotiate_rsize(struct cifs_tcon *tcon, struct smb_vol *volume_info)
475{
476 __u64 unix_cap = le64_to_cpu(tcon->fsUnixInfo.Capability);
477 struct TCP_Server_Info *server = tcon->ses->server;
478 unsigned int rsize, defsize;
479
480 /*
481 * Set default value...
482 *
483 * HACK alert! Ancient servers have very small buffers. Even though
484 * MS-CIFS indicates that servers are only limited by the client's
485 * bufsize for reads, testing against win98se shows that it throws
486 * INVALID_PARAMETER errors if you try to request too large a read.
487 * OS/2 just sends back short reads.
488 *
489 * If the server doesn't advertise CAP_LARGE_READ_X, then assume that
490 * it can't handle a read request larger than its MaxBufferSize either.
491 */
492 if (tcon->unix_ext && (unix_cap & CIFS_UNIX_LARGE_READ_CAP))
493 defsize = CIFS_DEFAULT_IOSIZE;
494 else if (server->capabilities & CAP_LARGE_READ_X)
495 defsize = CIFS_DEFAULT_NON_POSIX_RSIZE;
496 else
497 defsize = server->maxBuf - sizeof(READ_RSP);
498
499 rsize = volume_info->rsize ? volume_info->rsize : defsize;
500
501 /*
502 * no CAP_LARGE_READ_X? Then MS-CIFS states that we must limit this to
503 * the client's MaxBufferSize.
504 */
505 if (!(server->capabilities & CAP_LARGE_READ_X))
506 rsize = min_t(unsigned int, CIFSMaxBufSize, rsize);
507
508 /* hard limit of CIFS_MAX_RSIZE */
509 rsize = min_t(unsigned int, rsize, CIFS_MAX_RSIZE);
510
511 return rsize;
512}
513
514static void
515cifs_qfs_tcon(const unsigned int xid, struct cifs_tcon *tcon)
516{
517 CIFSSMBQFSDeviceInfo(xid, tcon);
518 CIFSSMBQFSAttributeInfo(xid, tcon);
519}
520
521static int
522cifs_is_path_accessible(const unsigned int xid, struct cifs_tcon *tcon,
523 struct cifs_sb_info *cifs_sb, const char *full_path)
524{
525 int rc;
526 FILE_ALL_INFO *file_info;
527
528 file_info = kmalloc(sizeof(FILE_ALL_INFO), GFP_KERNEL);
529 if (file_info == NULL)
530 return -ENOMEM;
531
532 rc = CIFSSMBQPathInfo(xid, tcon, full_path, file_info,
533 0 /* not legacy */, cifs_sb->local_nls,
534 cifs_remap(cifs_sb));
535
536 if (rc == -EOPNOTSUPP || rc == -EINVAL)
537 rc = SMBQueryInformation(xid, tcon, full_path, file_info,
538 cifs_sb->local_nls, cifs_remap(cifs_sb));
539 kfree(file_info);
540 return rc;
541}
542
543static int
544cifs_query_path_info(const unsigned int xid, struct cifs_tcon *tcon,
545 struct cifs_sb_info *cifs_sb, const char *full_path,
546 FILE_ALL_INFO *data, bool *adjustTZ, bool *symlink)
547{
548 int rc;
549
550 *symlink = false;
551
552 /* could do find first instead but this returns more info */
553 rc = CIFSSMBQPathInfo(xid, tcon, full_path, data, 0 /* not legacy */,
554 cifs_sb->local_nls, cifs_remap(cifs_sb));
555 /*
556 * BB optimize code so we do not make the above call when server claims
557 * no NT SMB support and the above call failed at least once - set flag
558 * in tcon or mount.
559 */
560 if ((rc == -EOPNOTSUPP) || (rc == -EINVAL)) {
561 rc = SMBQueryInformation(xid, tcon, full_path, data,
562 cifs_sb->local_nls,
563 cifs_remap(cifs_sb));
564 *adjustTZ = true;
565 }
566
567 if (!rc && (le32_to_cpu(data->Attributes) & ATTR_REPARSE)) {
568 int tmprc;
569 int oplock = 0;
570 struct cifs_fid fid;
571 struct cifs_open_parms oparms;
572
573 oparms.tcon = tcon;
574 oparms.cifs_sb = cifs_sb;
575 oparms.desired_access = FILE_READ_ATTRIBUTES;
576 oparms.create_options = 0;
577 oparms.disposition = FILE_OPEN;
578 oparms.path = full_path;
579 oparms.fid = &fid;
580 oparms.reconnect = false;
581
582 /* Need to check if this is a symbolic link or not */
583 tmprc = CIFS_open(xid, &oparms, &oplock, NULL);
584 if (tmprc == -EOPNOTSUPP)
585 *symlink = true;
586 else if (tmprc == 0)
587 CIFSSMBClose(xid, tcon, fid.netfid);
588 }
589
590 return rc;
591}
592
593static int
594cifs_get_srv_inum(const unsigned int xid, struct cifs_tcon *tcon,
595 struct cifs_sb_info *cifs_sb, const char *full_path,
596 u64 *uniqueid, FILE_ALL_INFO *data)
597{
598 /*
599 * We can not use the IndexNumber field by default from Windows or
600 * Samba (in ALL_INFO buf) but we can request it explicitly. The SNIA
601 * CIFS spec claims that this value is unique within the scope of a
602 * share, and the windows docs hint that it's actually unique
603 * per-machine.
604 *
605 * There may be higher info levels that work but are there Windows
606 * server or network appliances for which IndexNumber field is not
607 * guaranteed unique?
608 */
609 return CIFSGetSrvInodeNumber(xid, tcon, full_path, uniqueid,
610 cifs_sb->local_nls,
611 cifs_remap(cifs_sb));
612}
613
614static int
615cifs_query_file_info(const unsigned int xid, struct cifs_tcon *tcon,
616 struct cifs_fid *fid, FILE_ALL_INFO *data)
617{
618 return CIFSSMBQFileInfo(xid, tcon, fid->netfid, data);
619}
620
621static void
622cifs_clear_stats(struct cifs_tcon *tcon)
623{
624#ifdef CONFIG_CIFS_STATS
625 atomic_set(&tcon->stats.cifs_stats.num_writes, 0);
626 atomic_set(&tcon->stats.cifs_stats.num_reads, 0);
627 atomic_set(&tcon->stats.cifs_stats.num_flushes, 0);
628 atomic_set(&tcon->stats.cifs_stats.num_oplock_brks, 0);
629 atomic_set(&tcon->stats.cifs_stats.num_opens, 0);
630 atomic_set(&tcon->stats.cifs_stats.num_posixopens, 0);
631 atomic_set(&tcon->stats.cifs_stats.num_posixmkdirs, 0);
632 atomic_set(&tcon->stats.cifs_stats.num_closes, 0);
633 atomic_set(&tcon->stats.cifs_stats.num_deletes, 0);
634 atomic_set(&tcon->stats.cifs_stats.num_mkdirs, 0);
635 atomic_set(&tcon->stats.cifs_stats.num_rmdirs, 0);
636 atomic_set(&tcon->stats.cifs_stats.num_renames, 0);
637 atomic_set(&tcon->stats.cifs_stats.num_t2renames, 0);
638 atomic_set(&tcon->stats.cifs_stats.num_ffirst, 0);
639 atomic_set(&tcon->stats.cifs_stats.num_fnext, 0);
640 atomic_set(&tcon->stats.cifs_stats.num_fclose, 0);
641 atomic_set(&tcon->stats.cifs_stats.num_hardlinks, 0);
642 atomic_set(&tcon->stats.cifs_stats.num_symlinks, 0);
643 atomic_set(&tcon->stats.cifs_stats.num_locks, 0);
644 atomic_set(&tcon->stats.cifs_stats.num_acl_get, 0);
645 atomic_set(&tcon->stats.cifs_stats.num_acl_set, 0);
646#endif
647}
648
649static void
650cifs_print_stats(struct seq_file *m, struct cifs_tcon *tcon)
651{
652#ifdef CONFIG_CIFS_STATS
653 seq_printf(m, " Oplocks breaks: %d",
654 atomic_read(&tcon->stats.cifs_stats.num_oplock_brks));
655 seq_printf(m, "\nReads: %d Bytes: %llu",
656 atomic_read(&tcon->stats.cifs_stats.num_reads),
657 (long long)(tcon->bytes_read));
658 seq_printf(m, "\nWrites: %d Bytes: %llu",
659 atomic_read(&tcon->stats.cifs_stats.num_writes),
660 (long long)(tcon->bytes_written));
661 seq_printf(m, "\nFlushes: %d",
662 atomic_read(&tcon->stats.cifs_stats.num_flushes));
663 seq_printf(m, "\nLocks: %d HardLinks: %d Symlinks: %d",
664 atomic_read(&tcon->stats.cifs_stats.num_locks),
665 atomic_read(&tcon->stats.cifs_stats.num_hardlinks),
666 atomic_read(&tcon->stats.cifs_stats.num_symlinks));
667 seq_printf(m, "\nOpens: %d Closes: %d Deletes: %d",
668 atomic_read(&tcon->stats.cifs_stats.num_opens),
669 atomic_read(&tcon->stats.cifs_stats.num_closes),
670 atomic_read(&tcon->stats.cifs_stats.num_deletes));
671 seq_printf(m, "\nPosix Opens: %d Posix Mkdirs: %d",
672 atomic_read(&tcon->stats.cifs_stats.num_posixopens),
673 atomic_read(&tcon->stats.cifs_stats.num_posixmkdirs));
674 seq_printf(m, "\nMkdirs: %d Rmdirs: %d",
675 atomic_read(&tcon->stats.cifs_stats.num_mkdirs),
676 atomic_read(&tcon->stats.cifs_stats.num_rmdirs));
677 seq_printf(m, "\nRenames: %d T2 Renames %d",
678 atomic_read(&tcon->stats.cifs_stats.num_renames),
679 atomic_read(&tcon->stats.cifs_stats.num_t2renames));
680 seq_printf(m, "\nFindFirst: %d FNext %d FClose %d",
681 atomic_read(&tcon->stats.cifs_stats.num_ffirst),
682 atomic_read(&tcon->stats.cifs_stats.num_fnext),
683 atomic_read(&tcon->stats.cifs_stats.num_fclose));
684#endif
685}
686
687static void
688cifs_mkdir_setinfo(struct inode *inode, const char *full_path,
689 struct cifs_sb_info *cifs_sb, struct cifs_tcon *tcon,
690 const unsigned int xid)
691{
692 FILE_BASIC_INFO info;
693 struct cifsInodeInfo *cifsInode;
694 u32 dosattrs;
695 int rc;
696
697 memset(&info, 0, sizeof(info));
698 cifsInode = CIFS_I(inode);
699 dosattrs = cifsInode->cifsAttrs|ATTR_READONLY;
700 info.Attributes = cpu_to_le32(dosattrs);
701 rc = CIFSSMBSetPathInfo(xid, tcon, full_path, &info, cifs_sb->local_nls,
702 cifs_remap(cifs_sb));
703 if (rc == 0)
704 cifsInode->cifsAttrs = dosattrs;
705}
706
707static int
708cifs_open_file(const unsigned int xid, struct cifs_open_parms *oparms,
709 __u32 *oplock, FILE_ALL_INFO *buf)
710{
711 if (!(oparms->tcon->ses->capabilities & CAP_NT_SMBS))
712 return SMBLegacyOpen(xid, oparms->tcon, oparms->path,
713 oparms->disposition,
714 oparms->desired_access,
715 oparms->create_options,
716 &oparms->fid->netfid, oplock, buf,
717 oparms->cifs_sb->local_nls,
718 cifs_remap(oparms->cifs_sb));
719 return CIFS_open(xid, oparms, oplock, buf);
720}
721
722static void
723cifs_set_fid(struct cifsFileInfo *cfile, struct cifs_fid *fid, __u32 oplock)
724{
725 struct cifsInodeInfo *cinode = CIFS_I(d_inode(cfile->dentry));
726 cfile->fid.netfid = fid->netfid;
727 cifs_set_oplock_level(cinode, oplock);
728 cinode->can_cache_brlcks = CIFS_CACHE_WRITE(cinode);
729}
730
731static void
732cifs_close_file(const unsigned int xid, struct cifs_tcon *tcon,
733 struct cifs_fid *fid)
734{
735 CIFSSMBClose(xid, tcon, fid->netfid);
736}
737
738static int
739cifs_flush_file(const unsigned int xid, struct cifs_tcon *tcon,
740 struct cifs_fid *fid)
741{
742 return CIFSSMBFlush(xid, tcon, fid->netfid);
743}
744
745static int
746cifs_sync_read(const unsigned int xid, struct cifs_fid *pfid,
747 struct cifs_io_parms *parms, unsigned int *bytes_read,
748 char **buf, int *buf_type)
749{
750 parms->netfid = pfid->netfid;
751 return CIFSSMBRead(xid, parms, bytes_read, buf, buf_type);
752}
753
754static int
755cifs_sync_write(const unsigned int xid, struct cifs_fid *pfid,
756 struct cifs_io_parms *parms, unsigned int *written,
757 struct kvec *iov, unsigned long nr_segs)
758{
759
760 parms->netfid = pfid->netfid;
761 return CIFSSMBWrite2(xid, parms, written, iov, nr_segs);
762}
763
764static int
765smb_set_file_info(struct inode *inode, const char *full_path,
766 FILE_BASIC_INFO *buf, const unsigned int xid)
767{
768 int oplock = 0;
769 int rc;
770 __u32 netpid;
771 struct cifs_fid fid;
772 struct cifs_open_parms oparms;
773 struct cifsFileInfo *open_file;
774 struct cifsInodeInfo *cinode = CIFS_I(inode);
775 struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
776 struct tcon_link *tlink = NULL;
777 struct cifs_tcon *tcon;
778
779 /* if the file is already open for write, just use that fileid */
780 open_file = find_writable_file(cinode, true);
781 if (open_file) {
782 fid.netfid = open_file->fid.netfid;
783 netpid = open_file->pid;
784 tcon = tlink_tcon(open_file->tlink);
785 goto set_via_filehandle;
786 }
787
788 tlink = cifs_sb_tlink(cifs_sb);
789 if (IS_ERR(tlink)) {
790 rc = PTR_ERR(tlink);
791 tlink = NULL;
792 goto out;
793 }
794 tcon = tlink_tcon(tlink);
795
796 rc = CIFSSMBSetPathInfo(xid, tcon, full_path, buf, cifs_sb->local_nls,
797 cifs_remap(cifs_sb));
798 if (rc == 0) {
799 cinode->cifsAttrs = le32_to_cpu(buf->Attributes);
800 goto out;
801 } else if (rc != -EOPNOTSUPP && rc != -EINVAL) {
802 goto out;
803 }
804
805 oparms.tcon = tcon;
806 oparms.cifs_sb = cifs_sb;
807 oparms.desired_access = SYNCHRONIZE | FILE_WRITE_ATTRIBUTES;
808 oparms.create_options = CREATE_NOT_DIR;
809 oparms.disposition = FILE_OPEN;
810 oparms.path = full_path;
811 oparms.fid = &fid;
812 oparms.reconnect = false;
813
814 cifs_dbg(FYI, "calling SetFileInfo since SetPathInfo for times not supported by this server\n");
815 rc = CIFS_open(xid, &oparms, &oplock, NULL);
816 if (rc != 0) {
817 if (rc == -EIO)
818 rc = -EINVAL;
819 goto out;
820 }
821
822 netpid = current->tgid;
823
824set_via_filehandle:
825 rc = CIFSSMBSetFileInfo(xid, tcon, buf, fid.netfid, netpid);
826 if (!rc)
827 cinode->cifsAttrs = le32_to_cpu(buf->Attributes);
828
829 if (open_file == NULL)
830 CIFSSMBClose(xid, tcon, fid.netfid);
831 else
832 cifsFileInfo_put(open_file);
833out:
834 if (tlink != NULL)
835 cifs_put_tlink(tlink);
836 return rc;
837}
838
839static int
840cifs_set_compression(const unsigned int xid, struct cifs_tcon *tcon,
841 struct cifsFileInfo *cfile)
842{
843 return CIFSSMB_set_compression(xid, tcon, cfile->fid.netfid);
844}
845
846static int
847cifs_query_dir_first(const unsigned int xid, struct cifs_tcon *tcon,
848 const char *path, struct cifs_sb_info *cifs_sb,
849 struct cifs_fid *fid, __u16 search_flags,
850 struct cifs_search_info *srch_inf)
851{
852 return CIFSFindFirst(xid, tcon, path, cifs_sb,
853 &fid->netfid, search_flags, srch_inf, true);
854}
855
856static int
857cifs_query_dir_next(const unsigned int xid, struct cifs_tcon *tcon,
858 struct cifs_fid *fid, __u16 search_flags,
859 struct cifs_search_info *srch_inf)
860{
861 return CIFSFindNext(xid, tcon, fid->netfid, search_flags, srch_inf);
862}
863
864static int
865cifs_close_dir(const unsigned int xid, struct cifs_tcon *tcon,
866 struct cifs_fid *fid)
867{
868 return CIFSFindClose(xid, tcon, fid->netfid);
869}
870
871static int
872cifs_oplock_response(struct cifs_tcon *tcon, struct cifs_fid *fid,
873 struct cifsInodeInfo *cinode)
874{
875 return CIFSSMBLock(0, tcon, fid->netfid, current->tgid, 0, 0, 0, 0,
876 LOCKING_ANDX_OPLOCK_RELEASE, false,
877 CIFS_CACHE_READ(cinode) ? 1 : 0);
878}
879
880static int
881cifs_queryfs(const unsigned int xid, struct cifs_tcon *tcon,
882 struct kstatfs *buf)
883{
884 int rc = -EOPNOTSUPP;
885
886 buf->f_type = CIFS_MAGIC_NUMBER;
887
888 /*
889 * We could add a second check for a QFS Unix capability bit
890 */
891 if ((tcon->ses->capabilities & CAP_UNIX) &&
892 (CIFS_POSIX_EXTENSIONS & le64_to_cpu(tcon->fsUnixInfo.Capability)))
893 rc = CIFSSMBQFSPosixInfo(xid, tcon, buf);
894
895 /*
896 * Only need to call the old QFSInfo if failed on newer one,
897 * e.g. by OS/2.
898 **/
899 if (rc && (tcon->ses->capabilities & CAP_NT_SMBS))
900 rc = CIFSSMBQFSInfo(xid, tcon, buf);
901
902 /*
903 * Some old Windows servers also do not support level 103, retry with
904 * older level one if old server failed the previous call or we
905 * bypassed it because we detected that this was an older LANMAN sess
906 */
907 if (rc)
908 rc = SMBOldQFSInfo(xid, tcon, buf);
909 return rc;
910}
911
912static int
913cifs_mand_lock(const unsigned int xid, struct cifsFileInfo *cfile, __u64 offset,
914 __u64 length, __u32 type, int lock, int unlock, bool wait)
915{
916 return CIFSSMBLock(xid, tlink_tcon(cfile->tlink), cfile->fid.netfid,
917 current->tgid, length, offset, unlock, lock,
918 (__u8)type, wait, 0);
919}
920
921static int
922cifs_unix_dfs_readlink(const unsigned int xid, struct cifs_tcon *tcon,
923 const unsigned char *searchName, char **symlinkinfo,
924 const struct nls_table *nls_codepage)
925{
926#ifdef CONFIG_CIFS_DFS_UPCALL
927 int rc;
928 unsigned int num_referrals = 0;
929 struct dfs_info3_param *referrals = NULL;
930
931 rc = get_dfs_path(xid, tcon->ses, searchName, nls_codepage,
932 &num_referrals, &referrals, 0);
933
934 if (!rc && num_referrals > 0) {
935 *symlinkinfo = kstrndup(referrals->node_name,
936 strlen(referrals->node_name),
937 GFP_KERNEL);
938 if (!*symlinkinfo)
939 rc = -ENOMEM;
940 free_dfs_info_array(referrals, num_referrals);
941 }
942 return rc;
943#else /* No DFS support */
944 return -EREMOTE;
945#endif
946}
947
948static int
949cifs_query_symlink(const unsigned int xid, struct cifs_tcon *tcon,
950 const char *full_path, char **target_path,
951 struct cifs_sb_info *cifs_sb)
952{
953 int rc;
954 int oplock = 0;
955 struct cifs_fid fid;
956 struct cifs_open_parms oparms;
957
958 cifs_dbg(FYI, "%s: path: %s\n", __func__, full_path);
959
960 /* Check for unix extensions */
961 if (cap_unix(tcon->ses)) {
962 rc = CIFSSMBUnixQuerySymLink(xid, tcon, full_path, target_path,
963 cifs_sb->local_nls,
964 cifs_remap(cifs_sb));
965 if (rc == -EREMOTE)
966 rc = cifs_unix_dfs_readlink(xid, tcon, full_path,
967 target_path,
968 cifs_sb->local_nls);
969
970 goto out;
971 }
972
973 oparms.tcon = tcon;
974 oparms.cifs_sb = cifs_sb;
975 oparms.desired_access = FILE_READ_ATTRIBUTES;
976 oparms.create_options = OPEN_REPARSE_POINT;
977 oparms.disposition = FILE_OPEN;
978 oparms.path = full_path;
979 oparms.fid = &fid;
980 oparms.reconnect = false;
981
982 rc = CIFS_open(xid, &oparms, &oplock, NULL);
983 if (rc)
984 goto out;
985
986 rc = CIFSSMBQuerySymLink(xid, tcon, fid.netfid, target_path,
987 cifs_sb->local_nls);
988 if (rc)
989 goto out_close;
990
991 convert_delimiter(*target_path, '/');
992out_close:
993 CIFSSMBClose(xid, tcon, fid.netfid);
994out:
995 if (!rc)
996 cifs_dbg(FYI, "%s: target path: %s\n", __func__, *target_path);
997 return rc;
998}
999
1000static bool
1001cifs_is_read_op(__u32 oplock)
1002{
1003 return oplock == OPLOCK_READ;
1004}
1005
1006static unsigned int
1007cifs_wp_retry_size(struct inode *inode)
1008{
1009 return CIFS_SB(inode->i_sb)->wsize;
1010}
1011
1012static bool
1013cifs_dir_needs_close(struct cifsFileInfo *cfile)
1014{
1015 return !cfile->srch_inf.endOfSearch && !cfile->invalidHandle;
1016}
1017
1018struct smb_version_operations smb1_operations = {
1019 .send_cancel = send_nt_cancel,
1020 .compare_fids = cifs_compare_fids,
1021 .setup_request = cifs_setup_request,
1022 .setup_async_request = cifs_setup_async_request,
1023 .check_receive = cifs_check_receive,
1024 .add_credits = cifs_add_credits,
1025 .set_credits = cifs_set_credits,
1026 .get_credits_field = cifs_get_credits_field,
1027 .get_credits = cifs_get_credits,
1028 .wait_mtu_credits = cifs_wait_mtu_credits,
1029 .get_next_mid = cifs_get_next_mid,
1030 .read_data_offset = cifs_read_data_offset,
1031 .read_data_length = cifs_read_data_length,
1032 .map_error = map_smb_to_linux_error,
1033 .find_mid = cifs_find_mid,
1034 .check_message = checkSMB,
1035 .dump_detail = cifs_dump_detail,
1036 .clear_stats = cifs_clear_stats,
1037 .print_stats = cifs_print_stats,
1038 .is_oplock_break = is_valid_oplock_break,
1039 .downgrade_oplock = cifs_downgrade_oplock,
1040 .check_trans2 = cifs_check_trans2,
1041 .need_neg = cifs_need_neg,
1042 .negotiate = cifs_negotiate,
1043 .negotiate_wsize = cifs_negotiate_wsize,
1044 .negotiate_rsize = cifs_negotiate_rsize,
1045 .sess_setup = CIFS_SessSetup,
1046 .logoff = CIFSSMBLogoff,
1047 .tree_connect = CIFSTCon,
1048 .tree_disconnect = CIFSSMBTDis,
1049 .get_dfs_refer = CIFSGetDFSRefer,
1050 .qfs_tcon = cifs_qfs_tcon,
1051 .is_path_accessible = cifs_is_path_accessible,
1052 .query_path_info = cifs_query_path_info,
1053 .query_file_info = cifs_query_file_info,
1054 .get_srv_inum = cifs_get_srv_inum,
1055 .set_path_size = CIFSSMBSetEOF,
1056 .set_file_size = CIFSSMBSetFileSize,
1057 .set_file_info = smb_set_file_info,
1058 .set_compression = cifs_set_compression,
1059 .echo = CIFSSMBEcho,
1060 .mkdir = CIFSSMBMkDir,
1061 .mkdir_setinfo = cifs_mkdir_setinfo,
1062 .rmdir = CIFSSMBRmDir,
1063 .unlink = CIFSSMBDelFile,
1064 .rename_pending_delete = cifs_rename_pending_delete,
1065 .rename = CIFSSMBRename,
1066 .create_hardlink = CIFSCreateHardLink,
1067 .query_symlink = cifs_query_symlink,
1068 .open = cifs_open_file,
1069 .set_fid = cifs_set_fid,
1070 .close = cifs_close_file,
1071 .flush = cifs_flush_file,
1072 .async_readv = cifs_async_readv,
1073 .async_writev = cifs_async_writev,
1074 .sync_read = cifs_sync_read,
1075 .sync_write = cifs_sync_write,
1076 .query_dir_first = cifs_query_dir_first,
1077 .query_dir_next = cifs_query_dir_next,
1078 .close_dir = cifs_close_dir,
1079 .calc_smb_size = smbCalcSize,
1080 .oplock_response = cifs_oplock_response,
1081 .queryfs = cifs_queryfs,
1082 .mand_lock = cifs_mand_lock,
1083 .mand_unlock_range = cifs_unlock_range,
1084 .push_mand_locks = cifs_push_mandatory_locks,
1085 .query_mf_symlink = cifs_query_mf_symlink,
1086 .create_mf_symlink = cifs_create_mf_symlink,
1087 .is_read_op = cifs_is_read_op,
1088 .wp_retry_size = cifs_wp_retry_size,
1089 .dir_needs_close = cifs_dir_needs_close,
1090#ifdef CONFIG_CIFS_XATTR
1091 .query_all_EAs = CIFSSMBQAllEAs,
1092 .set_EA = CIFSSMBSetEA,
1093#endif /* CIFS_XATTR */
1094#ifdef CONFIG_CIFS_ACL
1095 .get_acl = get_cifs_acl,
1096 .get_acl_by_fid = get_cifs_acl_by_fid,
1097 .set_acl = set_cifs_acl,
1098#endif /* CIFS_ACL */
1099};
1100
1101struct smb_version_values smb1_values = {
1102 .version_string = SMB1_VERSION_STRING,
1103 .large_lock_type = LOCKING_ANDX_LARGE_FILES,
1104 .exclusive_lock_type = 0,
1105 .shared_lock_type = LOCKING_ANDX_SHARED_LOCK,
1106 .unlock_lock_type = 0,
1107 .header_size = sizeof(struct smb_hdr),
1108 .max_header_size = MAX_CIFS_HDR_SIZE,
1109 .read_rsp_size = sizeof(READ_RSP),
1110 .lock_cmd = cpu_to_le16(SMB_COM_LOCKING_ANDX),
1111 .cap_unix = CAP_UNIX,
1112 .cap_nt_find = CAP_NT_SMBS | CAP_NT_FIND,
1113 .cap_large_files = CAP_LARGE_FILES,
1114 .signing_enabled = SECMODE_SIGN_ENABLED,
1115 .signing_required = SECMODE_SIGN_REQUIRED,
1116};