1 /* SPDX-License-Identifier: LGPL-2.1 */
2 /*
3 *
4 * Copyright (C) International Business Machines Corp., 2002,2008
5 * Author(s): Steve French (sfrench@us.ibm.com)
6 * Jeremy Allison (jra@samba.org)
7 *
8 */
9 #ifndef _CIFS_GLOB_H
10 #define _CIFS_GLOB_H
11
12 #include <linux/in.h>
13 #include <linux/in6.h>
14 #include <linux/inet.h>
15 #include <linux/slab.h>
16 #include <linux/scatterlist.h>
17 #include <linux/mm.h>
18 #include <linux/mempool.h>
19 #include <linux/workqueue.h>
20 #include <linux/utsname.h>
21 #include <linux/sched/mm.h>
22 #include <linux/netfs.h>
23 #include "cifs_fs_sb.h"
24 #include "cifsacl.h"
25 #include <crypto/internal/hash.h>
26 #include <uapi/linux/cifs/cifs_mount.h>
27 #include "../common/smb2pdu.h"
28 #include "smb2pdu.h"
29 #include <linux/filelock.h>
30
31 #define SMB_PATH_MAX 260
32 #define CIFS_PORT 445
33 #define RFC1001_PORT 139
34
35 /*
36 * The sizes of various internal tables and strings
37 */
38 #define MAX_UID_INFO 16
39 #define MAX_SES_INFO 2
40 #define MAX_TCON_INFO 4
41
42 #define MAX_TREE_SIZE (2 + CIFS_NI_MAXHOST + 1 + CIFS_MAX_SHARE_LEN + 1)
43
44 #define CIFS_MIN_RCV_POOL 4
45
46 #define MAX_REOPEN_ATT 5 /* these many maximum attempts to reopen a file */
47 /*
48 * default attribute cache timeout (jiffies)
49 */
50 #define CIFS_DEF_ACTIMEO (1 * HZ)
51
52 /*
53 * max sleep time before retry to server
54 */
55 #define CIFS_MAX_SLEEP 2000
56
57 /*
58 * max attribute cache timeout (jiffies) - 2^30
59 */
60 #define CIFS_MAX_ACTIMEO (1 << 30)
61
62 /*
63 * Max persistent and resilient handle timeout (milliseconds).
64 * Windows durable max was 960000 (16 minutes)
65 */
66 #define SMB3_MAX_HANDLE_TIMEOUT 960000
67
68 /*
69 * MAX_REQ is the maximum number of requests that WE will send
70 * on one socket concurrently.
71 */
72 #define CIFS_MAX_REQ 32767
73
74 #define RFC1001_NAME_LEN 15
75 #define RFC1001_NAME_LEN_WITH_NULL (RFC1001_NAME_LEN + 1)
76
77 /* maximum length of ip addr as a string (including ipv6 and sctp) */
78 #define SERVER_NAME_LENGTH 80
79 #define SERVER_NAME_LEN_WITH_NULL (SERVER_NAME_LENGTH + 1)
80
81 /* echo interval in seconds */
82 #define SMB_ECHO_INTERVAL_MIN 1
83 #define SMB_ECHO_INTERVAL_MAX 600
84 #define SMB_ECHO_INTERVAL_DEFAULT 60
85
86 /* smb multichannel query server interfaces interval in seconds */
87 #define SMB_INTERFACE_POLL_INTERVAL 600
88
89 /* maximum number of PDUs in one compound */
90 #define MAX_COMPOUND 7
91
92 /*
93 * Default number of credits to keep available for SMB3.
94 * This value is chosen somewhat arbitrarily. The Windows client
95 * defaults to 128 credits, the Windows server allows clients up to
96 * 512 credits (or 8K for later versions), and the NetApp server
97 * does not limit clients at all. Choose a high enough default value
98 * such that the client shouldn't limit performance, but allow mount
99 * to override (until you approach 64K, where we limit credits to 65000
100 * to reduce possibility of seeing more server credit overflow bugs.
101 */
102 #define SMB2_MAX_CREDITS_AVAILABLE 32000
103
104 #include "cifspdu.h"
105
106 #ifndef XATTR_DOS_ATTRIB
107 #define XATTR_DOS_ATTRIB "user.DOSATTRIB"
108 #endif
109
110 #define CIFS_MAX_WORKSTATION_LEN (__NEW_UTS_LEN + 1) /* reasonable max for client */
111
112 #define CIFS_DFS_ROOT_SES(ses) ((ses)->dfs_root_ses ?: (ses))
113
114 /*
115 * CIFS vfs client Status information (based on what we know.)
116 */
117
118 /* associated with each connection */
119 enum statusEnum {
120 CifsNew = 0,
121 CifsGood,
122 CifsExiting,
123 CifsNeedReconnect,
124 CifsNeedNegotiate,
125 CifsInNegotiate,
126 };
127
128 /* associated with each smb session */
129 enum ses_status_enum {
130 SES_NEW = 0,
131 SES_GOOD,
132 SES_EXITING,
133 SES_NEED_RECON,
134 SES_IN_SETUP
135 };
136
137 /* associated with each tree connection to the server */
138 enum tid_status_enum {
139 TID_NEW = 0,
140 TID_GOOD,
141 TID_EXITING,
142 TID_NEED_RECON,
143 TID_NEED_TCON,
144 TID_IN_TCON,
145 TID_NEED_FILES_INVALIDATE, /* currently unused */
146 TID_IN_FILES_INVALIDATE
147 };
148
149 enum securityEnum {
150 Unspecified = 0, /* not specified */
151 NTLMv2, /* Legacy NTLM auth with NTLMv2 hash */
152 RawNTLMSSP, /* NTLMSSP without SPNEGO, NTLMv2 hash */
153 Kerberos, /* Kerberos via SPNEGO */
154 };
155
156 enum cifs_reparse_type {
157 CIFS_REPARSE_TYPE_NFS,
158 CIFS_REPARSE_TYPE_WSL,
159 CIFS_REPARSE_TYPE_DEFAULT = CIFS_REPARSE_TYPE_NFS,
160 };
161
162 static inline const char *cifs_reparse_type_str(enum cifs_reparse_type type)
163 {
164 switch (type) {
165 case CIFS_REPARSE_TYPE_NFS:
166 return "nfs";
167 case CIFS_REPARSE_TYPE_WSL:
168 return "wsl";
169 default:
170 return "unknown";
171 }
172 }
173
174 struct session_key {
175 unsigned int len;
176 char *response;
177 };
178
179 /* crypto hashing related structure/fields, not specific to a sec mech */
180 struct cifs_secmech {
181 struct shash_desc *hmacmd5; /* hmacmd5 hash function, for NTLMv2/CR1 hashes */
182 struct shash_desc *md5; /* md5 hash function, for CIFS/SMB1 signatures */
183 struct shash_desc *hmacsha256; /* hmac-sha256 hash function, for SMB2 signatures */
184 struct shash_desc *sha512; /* sha512 hash function, for SMB3.1.1 preauth hash */
185 struct shash_desc *aes_cmac; /* block-cipher based MAC function, for SMB3 signatures */
186
187 struct crypto_aead *enc; /* smb3 encryption AEAD TFM (AES-CCM and AES-GCM) */
188 struct crypto_aead *dec; /* smb3 decryption AEAD TFM (AES-CCM and AES-GCM) */
189 };
190
191 /* per smb session structure/fields */
192 struct ntlmssp_auth {
193 bool sesskey_per_smbsess; /* whether session key is per smb session */
194 __u32 client_flags; /* sent by client in type 1 ntlmsssp exchange */
195 __u32 server_flags; /* sent by server in type 2 ntlmssp exchange */
196 unsigned char ciphertext[CIFS_CPHTXT_SIZE]; /* sent to server */
197 char cryptkey[CIFS_CRYPTO_KEY_SIZE]; /* used by ntlmssp */
198 };
199
200 struct cifs_cred {
201 int uid;
202 int gid;
203 int mode;
204 int cecount;
205 struct cifs_sid osid;
206 struct cifs_sid gsid;
207 struct cifs_ntace *ntaces;
208 struct cifs_ace *aces;
209 };
210
211 struct cifs_open_info_data {
212 bool adjust_tz;
213 union {
214 bool reparse_point;
215 bool symlink;
216 };
217 struct {
218 /* ioctl response buffer */
219 struct {
220 int buftype;
221 struct kvec iov;
222 } io;
223 __u32 tag;
224 union {
225 struct reparse_data_buffer *buf;
226 struct reparse_posix_data *posix;
227 };
228 } reparse;
229 struct {
230 __u8 eas[SMB2_WSL_MAX_QUERY_EA_RESP_SIZE];
231 unsigned int eas_len;
232 } wsl;
233 char *symlink_target;
234 struct cifs_sid posix_owner;
235 struct cifs_sid posix_group;
236 union {
237 struct smb2_file_all_info fi;
238 struct smb311_posix_qinfo posix_fi;
239 };
240 };
241
242 /*
243 *****************************************************************
244 * Except the CIFS PDUs themselves all the
245 * globally interesting structs should go here
246 *****************************************************************
247 */
248
249 /*
250 * A smb_rqst represents a complete request to be issued to a server. It's
251 * formed by a kvec array, followed by an array of pages. Page data is assumed
252 * to start at the beginning of the first page.
253 */
254 struct smb_rqst {
255 struct kvec *rq_iov; /* array of kvecs */
256 unsigned int rq_nvec; /* number of kvecs in array */
257 size_t rq_iter_size; /* Amount of data in ->rq_iter */
258 struct iov_iter rq_iter; /* Data iterator */
259 struct xarray rq_buffer; /* Page buffer for encryption */
260 };
261
262 struct mid_q_entry;
263 struct TCP_Server_Info;
264 struct cifsFileInfo;
265 struct cifs_ses;
266 struct cifs_tcon;
267 struct dfs_info3_param;
268 struct cifs_fattr;
269 struct smb3_fs_context;
270 struct cifs_fid;
271 struct cifs_io_subrequest;
272 struct cifs_io_parms;
273 struct cifs_search_info;
274 struct cifsInodeInfo;
275 struct cifs_open_parms;
276 struct cifs_credits;
277
278 struct smb_version_operations {
279 int (*send_cancel)(struct TCP_Server_Info *, struct smb_rqst *,
280 struct mid_q_entry *);
281 bool (*compare_fids)(struct cifsFileInfo *, struct cifsFileInfo *);
282 /* setup request: allocate mid, sign message */
283 struct mid_q_entry *(*setup_request)(struct cifs_ses *,
284 struct TCP_Server_Info *,
285 struct smb_rqst *);
286 /* setup async request: allocate mid, sign message */
287 struct mid_q_entry *(*setup_async_request)(struct TCP_Server_Info *,
288 struct smb_rqst *);
289 /* check response: verify signature, map error */
290 int (*check_receive)(struct mid_q_entry *, struct TCP_Server_Info *,
291 bool);
292 void (*add_credits)(struct TCP_Server_Info *server,
293 struct cifs_credits *credits,
294 const int optype);
295 void (*set_credits)(struct TCP_Server_Info *, const int);
296 int * (*get_credits_field)(struct TCP_Server_Info *, const int);
297 unsigned int (*get_credits)(struct mid_q_entry *);
298 __u64 (*get_next_mid)(struct TCP_Server_Info *);
299 void (*revert_current_mid)(struct TCP_Server_Info *server,
300 const unsigned int val);
301 /* data offset from read response message */
302 unsigned int (*read_data_offset)(char *);
303 /*
304 * Data length from read response message
305 * When in_remaining is true, the returned data length is in
306 * message field DataRemaining for out-of-band data read (e.g through
307 * Memory Registration RDMA write in SMBD).
308 * Otherwise, the returned data length is in message field DataLength.
309 */
310 unsigned int (*read_data_length)(char *, bool in_remaining);
311 /* map smb to linux error */
312 int (*map_error)(char *, bool);
313 /* find mid corresponding to the response message */
314 struct mid_q_entry * (*find_mid)(struct TCP_Server_Info *, char *);
315 void (*dump_detail)(void *buf, struct TCP_Server_Info *ptcp_info);
316 void (*clear_stats)(struct cifs_tcon *);
317 void (*print_stats)(struct seq_file *m, struct cifs_tcon *);
318 void (*dump_share_caps)(struct seq_file *, struct cifs_tcon *);
319 /* verify the message */
320 int (*check_message)(char *, unsigned int, struct TCP_Server_Info *);
321 bool (*is_oplock_break)(char *, struct TCP_Server_Info *);
322 int (*handle_cancelled_mid)(struct mid_q_entry *, struct TCP_Server_Info *);
323 void (*downgrade_oplock)(struct TCP_Server_Info *server,
324 struct cifsInodeInfo *cinode, __u32 oplock,
325 unsigned int epoch, bool *purge_cache);
326 /* process transaction2 response */
327 bool (*check_trans2)(struct mid_q_entry *, struct TCP_Server_Info *,
328 char *, int);
329 /* check if we need to negotiate */
330 bool (*need_neg)(struct TCP_Server_Info *);
331 /* negotiate to the server */
332 int (*negotiate)(const unsigned int xid,
333 struct cifs_ses *ses,
334 struct TCP_Server_Info *server);
335 /* set negotiated write size */
336 unsigned int (*negotiate_wsize)(struct cifs_tcon *tcon, struct smb3_fs_context *ctx);
337 /* set negotiated read size */
338 unsigned int (*negotiate_rsize)(struct cifs_tcon *tcon, struct smb3_fs_context *ctx);
339 /* setup smb sessionn */
340 int (*sess_setup)(const unsigned int, struct cifs_ses *,
341 struct TCP_Server_Info *server,
342 const struct nls_table *);
343 /* close smb session */
344 int (*logoff)(const unsigned int, struct cifs_ses *);
345 /* connect to a server share */
346 int (*tree_connect)(const unsigned int, struct cifs_ses *, const char *,
347 struct cifs_tcon *, const struct nls_table *);
348 /* close tree connection */
349 int (*tree_disconnect)(const unsigned int, struct cifs_tcon *);
350 /* get DFS referrals */
351 int (*get_dfs_refer)(const unsigned int, struct cifs_ses *,
352 const char *, struct dfs_info3_param **,
353 unsigned int *, const struct nls_table *, int);
354 /* informational QFS call */
355 void (*qfs_tcon)(const unsigned int, struct cifs_tcon *,
356 struct cifs_sb_info *);
357 /* query for server interfaces */
358 int (*query_server_interfaces)(const unsigned int, struct cifs_tcon *,
359 bool);
360 /* check if a path is accessible or not */
361 int (*is_path_accessible)(const unsigned int, struct cifs_tcon *,
362 struct cifs_sb_info *, const char *);
363 /* query path data from the server */
364 int (*query_path_info)(const unsigned int xid,
365 struct cifs_tcon *tcon,
366 struct cifs_sb_info *cifs_sb,
367 const char *full_path,
368 struct cifs_open_info_data *data);
369 /* query file data from the server */
370 int (*query_file_info)(const unsigned int xid, struct cifs_tcon *tcon,
371 struct cifsFileInfo *cfile, struct cifs_open_info_data *data);
372 /* query reparse point to determine which type of special file */
373 int (*query_reparse_point)(const unsigned int xid,
374 struct cifs_tcon *tcon,
375 struct cifs_sb_info *cifs_sb,
376 const char *full_path,
377 u32 *tag, struct kvec *rsp,
378 int *rsp_buftype);
379 /* get server index number */
380 int (*get_srv_inum)(const unsigned int xid, struct cifs_tcon *tcon,
381 struct cifs_sb_info *cifs_sb, const char *full_path, u64 *uniqueid,
382 struct cifs_open_info_data *data);
383 /* set size by path */
384 int (*set_path_size)(const unsigned int, struct cifs_tcon *,
385 const char *, __u64, struct cifs_sb_info *, bool,
386 struct dentry *);
387 /* set size by file handle */
388 int (*set_file_size)(const unsigned int, struct cifs_tcon *,
389 struct cifsFileInfo *, __u64, bool);
390 /* set attributes */
391 int (*set_file_info)(struct inode *, const char *, FILE_BASIC_INFO *,
392 const unsigned int);
393 int (*set_compression)(const unsigned int, struct cifs_tcon *,
394 struct cifsFileInfo *);
395 /* check if we can send an echo or nor */
396 bool (*can_echo)(struct TCP_Server_Info *);
397 /* send echo request */
398 int (*echo)(struct TCP_Server_Info *);
399 /* create directory */
400 int (*posix_mkdir)(const unsigned int xid, struct inode *inode,
401 umode_t mode, struct cifs_tcon *tcon,
402 const char *full_path,
403 struct cifs_sb_info *cifs_sb);
404 int (*mkdir)(const unsigned int xid, struct inode *inode, umode_t mode,
405 struct cifs_tcon *tcon, const char *name,
406 struct cifs_sb_info *sb);
407 /* set info on created directory */
408 void (*mkdir_setinfo)(struct inode *, const char *,
409 struct cifs_sb_info *, struct cifs_tcon *,
410 const unsigned int);
411 /* remove directory */
412 int (*rmdir)(const unsigned int, struct cifs_tcon *, const char *,
413 struct cifs_sb_info *);
414 /* unlink file */
415 int (*unlink)(const unsigned int, struct cifs_tcon *, const char *,
416 struct cifs_sb_info *, struct dentry *);
417 /* open, rename and delete file */
418 int (*rename_pending_delete)(const char *, struct dentry *,
419 const unsigned int);
420 /* send rename request */
421 int (*rename)(const unsigned int xid,
422 struct cifs_tcon *tcon,
423 struct dentry *source_dentry,
424 const char *from_name, const char *to_name,
425 struct cifs_sb_info *cifs_sb);
426 /* send create hardlink request */
427 int (*create_hardlink)(const unsigned int xid,
428 struct cifs_tcon *tcon,
429 struct dentry *source_dentry,
430 const char *from_name, const char *to_name,
431 struct cifs_sb_info *cifs_sb);
432 /* query symlink target */
433 int (*query_symlink)(const unsigned int xid,
434 struct cifs_tcon *tcon,
435 struct cifs_sb_info *cifs_sb,
436 const char *full_path,
437 char **target_path);
438 /* open a file for non-posix mounts */
439 int (*open)(const unsigned int xid, struct cifs_open_parms *oparms, __u32 *oplock,
440 void *buf);
441 /* set fid protocol-specific info */
442 void (*set_fid)(struct cifsFileInfo *, struct cifs_fid *, __u32);
443 /* close a file */
444 int (*close)(const unsigned int, struct cifs_tcon *,
445 struct cifs_fid *);
446 /* close a file, returning file attributes and timestamps */
447 int (*close_getattr)(const unsigned int xid, struct cifs_tcon *tcon,
448 struct cifsFileInfo *pfile_info);
449 /* send a flush request to the server */
450 int (*flush)(const unsigned int, struct cifs_tcon *, struct cifs_fid *);
451 /* async read from the server */
452 int (*async_readv)(struct cifs_io_subrequest *);
453 /* async write to the server */
454 void (*async_writev)(struct cifs_io_subrequest *);
455 /* sync read from the server */
456 int (*sync_read)(const unsigned int, struct cifs_fid *,
457 struct cifs_io_parms *, unsigned int *, char **,
458 int *);
459 /* sync write to the server */
460 int (*sync_write)(const unsigned int, struct cifs_fid *,
461 struct cifs_io_parms *, unsigned int *, struct kvec *,
462 unsigned long);
463 /* open dir, start readdir */
464 int (*query_dir_first)(const unsigned int, struct cifs_tcon *,
465 const char *, struct cifs_sb_info *,
466 struct cifs_fid *, __u16,
467 struct cifs_search_info *);
468 /* continue readdir */
469 int (*query_dir_next)(const unsigned int, struct cifs_tcon *,
470 struct cifs_fid *,
471 __u16, struct cifs_search_info *srch_inf);
472 /* close dir */
473 int (*close_dir)(const unsigned int, struct cifs_tcon *,
474 struct cifs_fid *);
475 /* calculate a size of SMB message */
476 unsigned int (*calc_smb_size)(void *buf);
477 /* check for STATUS_PENDING and process the response if yes */
478 bool (*is_status_pending)(char *buf, struct TCP_Server_Info *server);
479 /* check for STATUS_NETWORK_SESSION_EXPIRED */
480 bool (*is_session_expired)(char *);
481 /* send oplock break response */
482 int (*oplock_response)(struct cifs_tcon *tcon, __u64 persistent_fid, __u64 volatile_fid,
483 __u16 net_fid, struct cifsInodeInfo *cifs_inode);
484 /* query remote filesystem */
485 int (*queryfs)(const unsigned int, struct cifs_tcon *,
486 struct cifs_sb_info *, struct kstatfs *);
487 /* send mandatory brlock to the server */
488 int (*mand_lock)(const unsigned int, struct cifsFileInfo *, __u64,
489 __u64, __u32, int, int, bool);
490 /* unlock range of mandatory locks */
491 int (*mand_unlock_range)(struct cifsFileInfo *, struct file_lock *,
492 const unsigned int);
493 /* push brlocks from the cache to the server */
494 int (*push_mand_locks)(struct cifsFileInfo *);
495 /* get lease key of the inode */
496 void (*get_lease_key)(struct inode *, struct cifs_fid *);
497 /* set lease key of the inode */
498 void (*set_lease_key)(struct inode *, struct cifs_fid *);
499 /* generate new lease key */
500 void (*new_lease_key)(struct cifs_fid *);
501 int (*generate_signingkey)(struct cifs_ses *ses,
502 struct TCP_Server_Info *server);
503 int (*calc_signature)(struct smb_rqst *, struct TCP_Server_Info *,
504 bool allocate_crypto);
505 int (*set_integrity)(const unsigned int, struct cifs_tcon *tcon,
506 struct cifsFileInfo *src_file);
507 int (*enum_snapshots)(const unsigned int xid, struct cifs_tcon *tcon,
508 struct cifsFileInfo *src_file, void __user *);
509 int (*notify)(const unsigned int xid, struct file *pfile,
510 void __user *pbuf, bool return_changes);
511 int (*query_mf_symlink)(unsigned int, struct cifs_tcon *,
512 struct cifs_sb_info *, const unsigned char *,
513 char *, unsigned int *);
514 int (*create_mf_symlink)(unsigned int, struct cifs_tcon *,
515 struct cifs_sb_info *, const unsigned char *,
516 char *, unsigned int *);
517 /* if we can do cache read operations */
518 bool (*is_read_op)(__u32);
519 /* set oplock level for the inode */
520 void (*set_oplock_level)(struct cifsInodeInfo *, __u32, unsigned int,
521 bool *);
522 /* create lease context buffer for CREATE request */
523 char * (*create_lease_buf)(u8 *lease_key, u8 oplock);
524 /* parse lease context buffer and return oplock/epoch info */
525 __u8 (*parse_lease_buf)(void *buf, unsigned int *epoch, char *lkey);
526 ssize_t (*copychunk_range)(const unsigned int,
527 struct cifsFileInfo *src_file,
528 struct cifsFileInfo *target_file,
529 u64 src_off, u64 len, u64 dest_off);
530 int (*duplicate_extents)(const unsigned int, struct cifsFileInfo *src,
531 struct cifsFileInfo *target_file, u64 src_off, u64 len,
532 u64 dest_off);
533 int (*validate_negotiate)(const unsigned int, struct cifs_tcon *);
534 ssize_t (*query_all_EAs)(const unsigned int, struct cifs_tcon *,
535 const unsigned char *, const unsigned char *, char *,
536 size_t, struct cifs_sb_info *);
537 int (*set_EA)(const unsigned int, struct cifs_tcon *, const char *,
538 const char *, const void *, const __u16,
539 const struct nls_table *, struct cifs_sb_info *);
540 struct cifs_ntsd * (*get_acl)(struct cifs_sb_info *, struct inode *,
541 const char *, u32 *, u32);
542 struct cifs_ntsd * (*get_acl_by_fid)(struct cifs_sb_info *,
543 const struct cifs_fid *, u32 *, u32);
544 int (*set_acl)(struct cifs_ntsd *, __u32, struct inode *, const char *,
545 int);
546 /* writepages retry size */
547 unsigned int (*wp_retry_size)(struct inode *);
548 /* get mtu credits */
549 int (*wait_mtu_credits)(struct TCP_Server_Info *, size_t,
550 size_t *, struct cifs_credits *);
551 /* adjust previously taken mtu credits to request size */
552 int (*adjust_credits)(struct TCP_Server_Info *server,
553 struct cifs_io_subrequest *subreq,
554 unsigned int /*enum smb3_rw_credits_trace*/ trace);
555 /* check if we need to issue closedir */
556 bool (*dir_needs_close)(struct cifsFileInfo *);
557 long (*fallocate)(struct file *, struct cifs_tcon *, int, loff_t,
558 loff_t);
559 /* init transform request - used for encryption for now */
560 int (*init_transform_rq)(struct TCP_Server_Info *, int num_rqst,
561 struct smb_rqst *, struct smb_rqst *);
562 int (*is_transform_hdr)(void *buf);
563 int (*receive_transform)(struct TCP_Server_Info *,
564 struct mid_q_entry **, char **, int *);
565 enum securityEnum (*select_sectype)(struct TCP_Server_Info *,
566 enum securityEnum);
567 int (*next_header)(struct TCP_Server_Info *server, char *buf,
568 unsigned int *noff);
569 /* ioctl passthrough for query_info */
570 int (*ioctl_query_info)(const unsigned int xid,
571 struct cifs_tcon *tcon,
572 struct cifs_sb_info *cifs_sb,
573 __le16 *path, int is_dir,
574 unsigned long p);
575 /* make unix special files (block, char, fifo, socket) */
576 int (*make_node)(unsigned int xid,
577 struct inode *inode,
578 struct dentry *dentry,
579 struct cifs_tcon *tcon,
580 const char *full_path,
581 umode_t mode,
582 dev_t device_number);
583 /* version specific fiemap implementation */
584 int (*fiemap)(struct cifs_tcon *tcon, struct cifsFileInfo *,
585 struct fiemap_extent_info *, u64, u64);
586 /* version specific llseek implementation */
587 loff_t (*llseek)(struct file *, struct cifs_tcon *, loff_t, int);
588 /* Check for STATUS_IO_TIMEOUT */
589 bool (*is_status_io_timeout)(char *buf);
590 /* Check for STATUS_NETWORK_NAME_DELETED */
591 bool (*is_network_name_deleted)(char *buf, struct TCP_Server_Info *srv);
592 int (*parse_reparse_point)(struct cifs_sb_info *cifs_sb,
593 struct kvec *rsp_iov,
594 struct cifs_open_info_data *data);
595 int (*create_reparse_symlink)(const unsigned int xid,
596 struct inode *inode,
597 struct dentry *dentry,
598 struct cifs_tcon *tcon,
599 const char *full_path,
600 const char *symname);
601 };
602
603 struct smb_version_values {
604 char *version_string;
605 __u16 protocol_id;
606 __u32 req_capabilities;
607 __u32 large_lock_type;
608 __u32 exclusive_lock_type;
609 __u32 shared_lock_type;
610 __u32 unlock_lock_type;
611 size_t header_preamble_size;
612 size_t header_size;
613 size_t max_header_size;
614 size_t read_rsp_size;
615 __le16 lock_cmd;
616 unsigned int cap_unix;
617 unsigned int cap_nt_find;
618 unsigned int cap_large_files;
619 __u16 signing_enabled;
620 __u16 signing_required;
621 size_t create_lease_size;
622 };
623
624 #define HEADER_SIZE(server) (server->vals->header_size)
625 #define MAX_HEADER_SIZE(server) (server->vals->max_header_size)
626 #define HEADER_PREAMBLE_SIZE(server) (server->vals->header_preamble_size)
627 #define MID_HEADER_SIZE(server) (HEADER_SIZE(server) - 1 - HEADER_PREAMBLE_SIZE(server))
628
629 /**
630 * CIFS superblock mount flags (mnt_cifs_flags) to consider when
631 * trying to reuse existing superblock for a new mount
632 */
633 #define CIFS_MOUNT_MASK (CIFS_MOUNT_NO_PERM | CIFS_MOUNT_SET_UID | \
634 CIFS_MOUNT_SERVER_INUM | CIFS_MOUNT_DIRECT_IO | \
635 CIFS_MOUNT_NO_XATTR | CIFS_MOUNT_MAP_SPECIAL_CHR | \
636 CIFS_MOUNT_MAP_SFM_CHR | \
637 CIFS_MOUNT_UNX_EMUL | CIFS_MOUNT_NO_BRL | \
638 CIFS_MOUNT_CIFS_ACL | CIFS_MOUNT_OVERR_UID | \
639 CIFS_MOUNT_OVERR_GID | CIFS_MOUNT_DYNPERM | \
640 CIFS_MOUNT_NOPOSIXBRL | CIFS_MOUNT_NOSSYNC | \
641 CIFS_MOUNT_FSCACHE | CIFS_MOUNT_MF_SYMLINKS | \
642 CIFS_MOUNT_MULTIUSER | CIFS_MOUNT_STRICT_IO | \
643 CIFS_MOUNT_CIFS_BACKUPUID | CIFS_MOUNT_CIFS_BACKUPGID | \
644 CIFS_MOUNT_UID_FROM_ACL | CIFS_MOUNT_NO_HANDLE_CACHE | \
645 CIFS_MOUNT_NO_DFS | CIFS_MOUNT_MODE_FROM_SID | \
646 CIFS_MOUNT_RO_CACHE | CIFS_MOUNT_RW_CACHE)
647
648 /**
649 * Generic VFS superblock mount flags (s_flags) to consider when
650 * trying to reuse existing superblock for a new mount
651 */
652 #define CIFS_MS_MASK (SB_RDONLY | SB_MANDLOCK | SB_NOEXEC | SB_NOSUID | \
653 SB_NODEV | SB_SYNCHRONOUS)
654
655 struct cifs_mnt_data {
656 struct cifs_sb_info *cifs_sb;
657 struct smb3_fs_context *ctx;
658 int flags;
659 };
660
661 static inline unsigned int
662 get_rfc1002_length(void *buf)
663 {
664 return be32_to_cpu(*((__be32 *)buf)) & 0xffffff;
665 }
666
667 static inline void
668 inc_rfc1001_len(void *buf, int count)
669 {
670 be32_add_cpu((__be32 *)buf, count);
671 }
672
673 struct TCP_Server_Info {
674 struct list_head tcp_ses_list;
675 struct list_head smb_ses_list;
676 spinlock_t srv_lock; /* protect anything here that is not protected */
677 __u64 conn_id; /* connection identifier (useful for debugging) */
678 int srv_count; /* reference counter */
679 /* 15 character server name + 0x20 16th byte indicating type = srv */
680 char server_RFC1001_name[RFC1001_NAME_LEN_WITH_NULL];
681 struct smb_version_operations *ops;
682 struct smb_version_values *vals;
683 /* updates to tcpStatus protected by cifs_tcp_ses_lock */
684 enum statusEnum tcpStatus; /* what we think the status is */
685 char *hostname; /* hostname portion of UNC string */
686 struct socket *ssocket;
687 struct sockaddr_storage dstaddr;
688 struct sockaddr_storage srcaddr; /* locally bind to this IP */
689 #ifdef CONFIG_NET_NS
690 struct net *net;
691 #endif
692 wait_queue_head_t response_q;
693 wait_queue_head_t request_q; /* if more than maxmpx to srvr must block*/
694 spinlock_t mid_lock; /* protect mid queue and it's entries */
695 struct list_head pending_mid_q;
696 bool noblocksnd; /* use blocking sendmsg */
697 bool noautotune; /* do not autotune send buf sizes */
698 bool nosharesock;
699 bool tcp_nodelay;
700 bool terminate;
701 unsigned int credits; /* send no more requests at once */
702 unsigned int max_credits; /* can override large 32000 default at mnt */
703 unsigned int in_flight; /* number of requests on the wire to server */
704 unsigned int max_in_flight; /* max number of requests that were on wire */
705 spinlock_t req_lock; /* protect the two values above */
706 struct mutex _srv_mutex;
707 unsigned int nofs_flag;
708 struct task_struct *tsk;
709 char server_GUID[16];
710 __u16 sec_mode;
711 bool sign; /* is signing enabled on this connection? */
712 bool ignore_signature:1; /* skip validation of signatures in SMB2/3 rsp */
713 bool session_estab; /* mark when very first sess is established */
714 int echo_credits; /* echo reserved slots */
715 int oplock_credits; /* oplock break reserved slots */
716 bool echoes:1; /* enable echoes */
717 __u8 client_guid[SMB2_CLIENT_GUID_SIZE]; /* Client GUID */
718 u16 dialect; /* dialect index that server chose */
719 bool oplocks:1; /* enable oplocks */
720 unsigned int maxReq; /* Clients should submit no more */
721 /* than maxReq distinct unanswered SMBs to the server when using */
722 /* multiplexed reads or writes (for SMB1/CIFS only, not SMB2/SMB3) */
723 unsigned int maxBuf; /* maxBuf specifies the maximum */
724 /* message size the server can send or receive for non-raw SMBs */
725 /* maxBuf is returned by SMB NegotiateProtocol so maxBuf is only 0 */
726 /* when socket is setup (and during reconnect) before NegProt sent */
727 unsigned int max_rw; /* maxRw specifies the maximum */
728 /* message size the server can send or receive for */
729 /* SMB_COM_WRITE_RAW or SMB_COM_READ_RAW. */
730 unsigned int capabilities; /* selective disabling of caps by smb sess */
731 int timeAdj; /* Adjust for difference in server time zone in sec */
732 __u64 CurrentMid; /* multiplex id - rotating counter, protected by GlobalMid_Lock */
733 char cryptkey[CIFS_CRYPTO_KEY_SIZE]; /* used by ntlm, ntlmv2 etc */
734 /* 16th byte of RFC1001 workstation name is always null */
735 char workstation_RFC1001_name[RFC1001_NAME_LEN_WITH_NULL];
736 __u32 sequence_number; /* for signing, protected by srv_mutex */
737 __u32 reconnect_instance; /* incremented on each reconnect */
738 struct session_key session_key;
739 unsigned long lstrp; /* when we got last response from this server */
740 struct cifs_secmech secmech; /* crypto sec mech functs, descriptors */
741 #define CIFS_NEGFLAVOR_UNENCAP 1 /* wct == 17, but no ext_sec */
742 #define CIFS_NEGFLAVOR_EXTENDED 2 /* wct == 17, ext_sec bit set */
743 char negflavor; /* NEGOTIATE response flavor */
744 /* extended security flavors that server supports */
745 bool sec_ntlmssp; /* supports NTLMSSP */
746 bool sec_kerberosu2u; /* supports U2U Kerberos */
747 bool sec_kerberos; /* supports plain Kerberos */
748 bool sec_mskerberos; /* supports legacy MS Kerberos */
749 bool large_buf; /* is current buffer large? */
750 /* use SMBD connection instead of socket */
751 bool rdma;
752 /* point to the SMBD connection if RDMA is used instead of socket */
753 struct smbd_connection *smbd_conn;
754 struct delayed_work echo; /* echo ping workqueue job */
755 char *smallbuf; /* pointer to current "small" buffer */
756 char *bigbuf; /* pointer to current "big" buffer */
757 /* Total size of this PDU. Only valid from cifs_demultiplex_thread */
758 unsigned int pdu_size;
759 unsigned int total_read; /* total amount of data read in this pass */
760 atomic_t in_send; /* requests trying to send */
761 atomic_t num_waiters; /* blocked waiting to get in sendrecv */
762 #ifdef CONFIG_CIFS_STATS2
763 atomic_t num_cmds[NUMBER_OF_SMB2_COMMANDS]; /* total requests by cmd */
764 atomic_t smb2slowcmd[NUMBER_OF_SMB2_COMMANDS]; /* count resps > 1 sec */
765 __u64 time_per_cmd[NUMBER_OF_SMB2_COMMANDS]; /* total time per cmd */
766 __u32 slowest_cmd[NUMBER_OF_SMB2_COMMANDS];
767 __u32 fastest_cmd[NUMBER_OF_SMB2_COMMANDS];
768 #endif /* STATS2 */
769 unsigned int max_read;
770 unsigned int max_write;
771 unsigned int min_offload;
772 unsigned int retrans;
773 struct {
774 bool requested; /* "compress" mount option set*/
775 bool enabled; /* actually negotiated with server */
776 __le16 alg; /* preferred alg negotiated with server */
777 } compression;
778 __u16 signing_algorithm;
779 __le16 cipher_type;
780 /* save initital negprot hash */
781 __u8 preauth_sha_hash[SMB2_PREAUTH_HASH_SIZE];
782 bool signing_negotiated; /* true if valid signing context rcvd from server */
783 bool posix_ext_supported;
784 struct delayed_work reconnect; /* reconnect workqueue job */
785 struct mutex reconnect_mutex; /* prevent simultaneous reconnects */
786 unsigned long echo_interval;
787
788 /*
789 * Number of targets available for reconnect. The more targets
790 * the more tasks have to wait to let the demultiplex thread
791 * reconnect.
792 */
793 int nr_targets;
794 bool noblockcnt; /* use non-blocking connect() */
795
796 /*
797 * If this is a session channel,
798 * primary_server holds the ref-counted
799 * pointer to primary channel connection for the session.
800 */
801 #define SERVER_IS_CHAN(server) (!!(server)->primary_server)
802 struct TCP_Server_Info *primary_server;
803 __u16 channel_sequence_num; /* incremented on primary channel on each chan reconnect */
804
805 #ifdef CONFIG_CIFS_SWN_UPCALL
806 bool use_swn_dstaddr;
807 struct sockaddr_storage swn_dstaddr;
808 #endif
809 struct mutex refpath_lock; /* protects leaf_fullpath */
810 /*
811 * leaf_fullpath: Canonical DFS referral path related to this
812 * connection.
813 * It is used in DFS cache refresher, reconnect and may
814 * change due to nested DFS links.
815 *
816 * Protected by @refpath_lock and @srv_lock. The @refpath_lock is
817 * mostly used for not requiring a copy of @leaf_fullpath when getting
818 * cached or new DFS referrals (which might also sleep during I/O).
819 * While @srv_lock is held for making string and NULL comparisons against
820 * both fields as in mount(2) and cache refresh.
821 *
822 * format: \\HOST\SHARE[\OPTIONAL PATH]
823 */
824 char *leaf_fullpath;
825 };
826
827 static inline bool is_smb1(struct TCP_Server_Info *server)
828 {
829 return HEADER_PREAMBLE_SIZE(server) != 0;
830 }
831
832 static inline void cifs_server_lock(struct TCP_Server_Info *server)
833 {
834 unsigned int nofs_flag = memalloc_nofs_save();
835
836 mutex_lock(&server->_srv_mutex);
837 server->nofs_flag = nofs_flag;
838 }
839
840 static inline void cifs_server_unlock(struct TCP_Server_Info *server)
841 {
842 unsigned int nofs_flag = server->nofs_flag;
843
844 mutex_unlock(&server->_srv_mutex);
845 memalloc_nofs_restore(nofs_flag);
846 }
847
848 struct cifs_credits {
849 unsigned int value;
850 unsigned int instance;
851 unsigned int in_flight_check;
852 unsigned int rreq_debug_id;
853 unsigned int rreq_debug_index;
854 };
855
856 static inline unsigned int
857 in_flight(struct TCP_Server_Info *server)
858 {
859 unsigned int num;
860
861 spin_lock(&server->req_lock);
862 num = server->in_flight;
863 spin_unlock(&server->req_lock);
864 return num;
865 }
866
867 static inline bool
868 has_credits(struct TCP_Server_Info *server, int *credits, int num_credits)
869 {
870 int num;
871
872 spin_lock(&server->req_lock);
873 num = *credits;
874 spin_unlock(&server->req_lock);
875 return num >= num_credits;
876 }
877
878 static inline void
879 add_credits(struct TCP_Server_Info *server, struct cifs_credits *credits,
880 const int optype)
881 {
882 server->ops->add_credits(server, credits, optype);
883 }
884
885 static inline void
886 add_credits_and_wake_if(struct TCP_Server_Info *server,
887 struct cifs_credits *credits, const int optype)
888 {
889 if (credits->value) {
890 server->ops->add_credits(server, credits, optype);
891 wake_up(&server->request_q);
892 credits->value = 0;
893 }
894 }
895
896 static inline void
897 set_credits(struct TCP_Server_Info *server, const int val)
898 {
899 server->ops->set_credits(server, val);
900 }
901
902 static inline int
903 adjust_credits(struct TCP_Server_Info *server, struct cifs_io_subrequest *subreq,
904 unsigned int /* enum smb3_rw_credits_trace */ trace)
905 {
906 return server->ops->adjust_credits ?
907 server->ops->adjust_credits(server, subreq, trace) : 0;
908 }
909
910 static inline __le64
911 get_next_mid64(struct TCP_Server_Info *server)
912 {
913 return cpu_to_le64(server->ops->get_next_mid(server));
914 }
915
916 static inline __le16
917 get_next_mid(struct TCP_Server_Info *server)
918 {
919 __u16 mid = server->ops->get_next_mid(server);
920 /*
921 * The value in the SMB header should be little endian for easy
922 * on-the-wire decoding.
923 */
924 return cpu_to_le16(mid);
925 }
926
927 static inline void
928 revert_current_mid(struct TCP_Server_Info *server, const unsigned int val)
929 {
930 if (server->ops->revert_current_mid)
931 server->ops->revert_current_mid(server, val);
932 }
933
934 static inline void
935 revert_current_mid_from_hdr(struct TCP_Server_Info *server,
936 const struct smb2_hdr *shdr)
937 {
938 unsigned int num = le16_to_cpu(shdr->CreditCharge);
939
940 return revert_current_mid(server, num > 0 ? num : 1);
941 }
942
943 static inline __u16
944 get_mid(const struct smb_hdr *smb)
945 {
946 return le16_to_cpu(smb->Mid);
947 }
948
949 static inline bool
950 compare_mid(__u16 mid, const struct smb_hdr *smb)
951 {
952 return mid == le16_to_cpu(smb->Mid);
953 }
954
955 /*
956 * When the server supports very large reads and writes via POSIX extensions,
957 * we can allow up to 2^24-1, minus the size of a READ/WRITE_AND_X header, not
958 * including the RFC1001 length.
959 *
960 * Note that this might make for "interesting" allocation problems during
961 * writeback however as we have to allocate an array of pointers for the
962 * pages. A 16M write means ~32kb page array with PAGE_SIZE == 4096.
963 *
964 * For reads, there is a similar problem as we need to allocate an array
965 * of kvecs to handle the receive, though that should only need to be done
966 * once.
967 */
968 #define CIFS_MAX_WSIZE ((1<<24) - 1 - sizeof(WRITE_REQ) + 4)
969 #define CIFS_MAX_RSIZE ((1<<24) - sizeof(READ_RSP) + 4)
970
971 /*
972 * When the server doesn't allow large posix writes, only allow a rsize/wsize
973 * of 2^17-1 minus the size of the call header. That allows for a read or
974 * write up to the maximum size described by RFC1002.
975 */
976 #define CIFS_MAX_RFC1002_WSIZE ((1<<17) - 1 - sizeof(WRITE_REQ) + 4)
977 #define CIFS_MAX_RFC1002_RSIZE ((1<<17) - 1 - sizeof(READ_RSP) + 4)
978
979 #define CIFS_DEFAULT_IOSIZE (1024 * 1024)
980
981 /*
982 * Windows only supports a max of 60kb reads and 65535 byte writes. Default to
983 * those values when posix extensions aren't in force. In actuality here, we
984 * use 65536 to allow for a write that is a multiple of 4k. Most servers seem
985 * to be ok with the extra byte even though Windows doesn't send writes that
986 * are that large.
987 *
988 * Citation:
989 *
990 * https://blogs.msdn.com/b/openspecification/archive/2009/04/10/smb-maximum-transmit-buffer-size-and-performance-tuning.aspx
991 */
992 #define CIFS_DEFAULT_NON_POSIX_RSIZE (60 * 1024)
993 #define CIFS_DEFAULT_NON_POSIX_WSIZE (65536)
994
995 /*
996 * Macros to allow the TCP_Server_Info->net field and related code to drop out
997 * when CONFIG_NET_NS isn't set.
998 */
999
1000 #ifdef CONFIG_NET_NS
1001
1002 static inline struct net *cifs_net_ns(struct TCP_Server_Info *srv)
1003 {
1004 return srv->net;
1005 }
1006
1007 static inline void cifs_set_net_ns(struct TCP_Server_Info *srv, struct net *net)
1008 {
1009 srv->net = net;
1010 }
1011
1012 #else
1013
1014 static inline struct net *cifs_net_ns(struct TCP_Server_Info *srv)
1015 {
1016 return &init_net;
1017 }
1018
1019 static inline void cifs_set_net_ns(struct TCP_Server_Info *srv, struct net *net)
1020 {
1021 }
1022
1023 #endif
1024
1025 struct cifs_server_iface {
1026 struct list_head iface_head;
1027 struct kref refcount;
1028 size_t speed;
1029 size_t weight_fulfilled;
1030 unsigned int num_channels;
1031 unsigned int rdma_capable : 1;
1032 unsigned int rss_capable : 1;
1033 unsigned int is_active : 1; /* unset if non existent */
1034 struct sockaddr_storage sockaddr;
1035 };
1036
1037 /* release iface when last ref is dropped */
1038 static inline void
1039 release_iface(struct kref *ref)
1040 {
1041 struct cifs_server_iface *iface = container_of(ref,
1042 struct cifs_server_iface,
1043 refcount);
1044 kfree(iface);
1045 }
1046
1047 struct cifs_chan {
1048 unsigned int in_reconnect : 1; /* if session setup in progress for this channel */
1049 struct TCP_Server_Info *server;
1050 struct cifs_server_iface *iface; /* interface in use */
1051 __u8 signkey[SMB3_SIGN_KEY_SIZE];
1052 };
1053
1054 #define CIFS_SES_FLAG_SCALE_CHANNELS (0x1)
1055
1056 /*
1057 * Session structure. One of these for each uid session with a particular host
1058 */
1059 struct cifs_ses {
1060 struct list_head smb_ses_list;
1061 struct list_head rlist; /* reconnect list */
1062 struct list_head tcon_list;
1063 struct cifs_tcon *tcon_ipc;
1064 spinlock_t ses_lock; /* protect anything here that is not protected */
1065 struct mutex session_mutex;
1066 struct TCP_Server_Info *server; /* pointer to server info */
1067 int ses_count; /* reference counter */
1068 enum ses_status_enum ses_status; /* updates protected by cifs_tcp_ses_lock */
1069 unsigned int overrideSecFlg; /* if non-zero override global sec flags */
1070 char *serverOS; /* name of operating system underlying server */
1071 char *serverNOS; /* name of network operating system of server */
1072 char *serverDomain; /* security realm of server */
1073 __u64 Suid; /* remote smb uid */
1074 kuid_t linux_uid; /* overriding owner of files on the mount */
1075 kuid_t cred_uid; /* owner of credentials */
1076 unsigned int capabilities;
1077 char ip_addr[INET6_ADDRSTRLEN + 1]; /* Max ipv6 (or v4) addr string len */
1078 char *user_name; /* must not be null except during init of sess
1079 and after mount option parsing we fill it */
1080 char *domainName;
1081 char *password;
1082 char *password2; /* When key rotation used, new password may be set before it expires */
1083 char workstation_name[CIFS_MAX_WORKSTATION_LEN];
1084 struct session_key auth_key;
1085 struct ntlmssp_auth *ntlmssp; /* ciphertext, flags, server challenge */
1086 enum securityEnum sectype; /* what security flavor was specified? */
1087 bool sign; /* is signing required? */
1088 bool domainAuto:1;
1089 bool expired_pwd; /* track if access denied or expired pwd so can know if need to update */
1090 unsigned int flags;
1091 __u16 session_flags;
1092 __u8 smb3signingkey[SMB3_SIGN_KEY_SIZE];
1093 __u8 smb3encryptionkey[SMB3_ENC_DEC_KEY_SIZE];
1094 __u8 smb3decryptionkey[SMB3_ENC_DEC_KEY_SIZE];
1095 __u8 preauth_sha_hash[SMB2_PREAUTH_HASH_SIZE];
1096
1097 /*
1098 * Network interfaces available on the server this session is
1099 * connected to.
1100 *
1101 * Other channels can be opened by connecting and binding this
1102 * session to interfaces from this list.
1103 *
1104 * iface_lock should be taken when accessing any of these fields
1105 */
1106 spinlock_t iface_lock;
1107 /* ========= begin: protected by iface_lock ======== */
1108 struct list_head iface_list;
1109 size_t iface_count;
1110 unsigned long iface_last_update; /* jiffies */
1111 /* ========= end: protected by iface_lock ======== */
1112
1113 spinlock_t chan_lock;
1114 /* ========= begin: protected by chan_lock ======== */
1115 #define CIFS_MAX_CHANNELS 16
1116 #define CIFS_INVAL_CHAN_INDEX (-1)
1117 #define CIFS_ALL_CHANNELS_SET(ses) \
1118 ((1UL << (ses)->chan_count) - 1)
1119 #define CIFS_ALL_CHANS_GOOD(ses) \
1120 (!(ses)->chans_need_reconnect)
1121 #define CIFS_ALL_CHANS_NEED_RECONNECT(ses) \
1122 ((ses)->chans_need_reconnect == CIFS_ALL_CHANNELS_SET(ses))
1123 #define CIFS_SET_ALL_CHANS_NEED_RECONNECT(ses) \
1124 ((ses)->chans_need_reconnect = CIFS_ALL_CHANNELS_SET(ses))
1125 #define CIFS_CHAN_NEEDS_RECONNECT(ses, index) \
1126 test_bit((index), &(ses)->chans_need_reconnect)
1127 #define CIFS_CHAN_IN_RECONNECT(ses, index) \
1128 ((ses)->chans[(index)].in_reconnect)
1129
1130 struct cifs_chan chans[CIFS_MAX_CHANNELS];
1131 size_t chan_count;
1132 size_t chan_max;
1133 atomic_t chan_seq; /* round robin state */
1134
1135 /*
1136 * chans_need_reconnect is a bitmap indicating which of the channels
1137 * under this smb session needs to be reconnected.
1138 * If not multichannel session, only one bit will be used.
1139 *
1140 * We will ask for sess and tcon reconnection only if all the
1141 * channels are marked for needing reconnection. This will
1142 * enable the sessions on top to continue to live till any
1143 * of the channels below are active.
1144 */
1145 unsigned long chans_need_reconnect;
1146 /* ========= end: protected by chan_lock ======== */
1147 struct cifs_ses *dfs_root_ses;
1148 struct nls_table *local_nls;
1149 };
1150
1151 static inline bool
1152 cap_unix(struct cifs_ses *ses)
1153 {
1154 return ses->server->vals->cap_unix & ses->capabilities;
1155 }
1156
1157 /*
1158 * common struct for holding inode info when searching for or updating an
1159 * inode with new info
1160 */
1161
1162 #define CIFS_FATTR_JUNCTION 0x1
1163 #define CIFS_FATTR_DELETE_PENDING 0x2
1164 #define CIFS_FATTR_NEED_REVAL 0x4
1165 #define CIFS_FATTR_INO_COLLISION 0x8
1166 #define CIFS_FATTR_UNKNOWN_NLINK 0x10
1167 #define CIFS_FATTR_FAKE_ROOT_INO 0x20
1168
1169 struct cifs_fattr {
1170 u32 cf_flags;
1171 u32 cf_cifsattrs;
1172 u64 cf_uniqueid;
1173 u64 cf_eof;
1174 u64 cf_bytes;
1175 u64 cf_createtime;
1176 kuid_t cf_uid;
1177 kgid_t cf_gid;
1178 umode_t cf_mode;
1179 dev_t cf_rdev;
1180 unsigned int cf_nlink;
1181 unsigned int cf_dtype;
1182 struct timespec64 cf_atime;
1183 struct timespec64 cf_mtime;
1184 struct timespec64 cf_ctime;
1185 u32 cf_cifstag;
1186 char *cf_symlink_target;
1187 };
1188
1189 /*
1190 * there is one of these for each connection to a resource on a particular
1191 * session
1192 */
1193 struct cifs_tcon {
1194 struct list_head tcon_list;
1195 int debug_id; /* Debugging for tracing */
1196 int tc_count;
1197 struct list_head rlist; /* reconnect list */
1198 spinlock_t tc_lock; /* protect anything here that is not protected */
1199 atomic_t num_local_opens; /* num of all opens including disconnected */
1200 atomic_t num_remote_opens; /* num of all network opens on server */
1201 struct list_head openFileList;
1202 spinlock_t open_file_lock; /* protects list above */
1203 struct cifs_ses *ses; /* pointer to session associated with */
1204 char tree_name[MAX_TREE_SIZE + 1]; /* UNC name of resource in ASCII */
1205 char *nativeFileSystem;
1206 char *password; /* for share-level security */
1207 __u32 tid; /* The 4 byte tree id */
1208 __u16 Flags; /* optional support bits */
1209 enum tid_status_enum status;
1210 atomic_t num_smbs_sent;
1211 union {
1212 struct {
1213 atomic_t num_writes;
1214 atomic_t num_reads;
1215 atomic_t num_flushes;
1216 atomic_t num_oplock_brks;
1217 atomic_t num_opens;
1218 atomic_t num_closes;
1219 atomic_t num_deletes;
1220 atomic_t num_mkdirs;
1221 atomic_t num_posixopens;
1222 atomic_t num_posixmkdirs;
1223 atomic_t num_rmdirs;
1224 atomic_t num_renames;
1225 atomic_t num_t2renames;
1226 atomic_t num_ffirst;
1227 atomic_t num_fnext;
1228 atomic_t num_fclose;
1229 atomic_t num_hardlinks;
1230 atomic_t num_symlinks;
1231 atomic_t num_locks;
1232 atomic_t num_acl_get;
1233 atomic_t num_acl_set;
1234 } cifs_stats;
1235 struct {
1236 atomic_t smb2_com_sent[NUMBER_OF_SMB2_COMMANDS];
1237 atomic_t smb2_com_failed[NUMBER_OF_SMB2_COMMANDS];
1238 } smb2_stats;
1239 } stats;
1240 __u64 bytes_read;
1241 __u64 bytes_written;
1242 spinlock_t stat_lock; /* protects the two fields above */
1243 time64_t stats_from_time;
1244 FILE_SYSTEM_DEVICE_INFO fsDevInfo;
1245 FILE_SYSTEM_ATTRIBUTE_INFO fsAttrInfo; /* ok if fs name truncated */
1246 FILE_SYSTEM_UNIX_INFO fsUnixInfo;
1247 bool ipc:1; /* set if connection to IPC$ share (always also pipe) */
1248 bool pipe:1; /* set if connection to pipe share */
1249 bool print:1; /* set if connection to printer share */
1250 bool retry:1;
1251 bool nocase:1;
1252 bool nohandlecache:1; /* if strange server resource prob can turn off */
1253 bool nodelete:1;
1254 bool seal:1; /* transport encryption for this mounted share */
1255 bool unix_ext:1; /* if false disable Linux extensions to CIFS protocol
1256 for this mount even if server would support */
1257 bool posix_extensions; /* if true SMB3.11 posix extensions enabled */
1258 bool local_lease:1; /* check leases (only) on local system not remote */
1259 bool broken_posix_open; /* e.g. Samba server versions < 3.3.2, 3.2.9 */
1260 bool broken_sparse_sup; /* if server or share does not support sparse */
1261 bool need_reconnect:1; /* connection reset, tid now invalid */
1262 bool need_reopen_files:1; /* need to reopen tcon file handles */
1263 bool use_resilient:1; /* use resilient instead of durable handles */
1264 bool use_persistent:1; /* use persistent instead of durable handles */
1265 bool no_lease:1; /* Do not request leases on files or directories */
1266 bool use_witness:1; /* use witness protocol */
1267 __le32 capabilities;
1268 __u32 share_flags;
1269 __u32 maximal_access;
1270 __u32 vol_serial_number;
1271 __le64 vol_create_time;
1272 __u64 snapshot_time; /* for timewarp tokens - timestamp of snapshot */
1273 __u32 handle_timeout; /* persistent and durable handle timeout in ms */
1274 __u32 ss_flags; /* sector size flags */
1275 __u32 perf_sector_size; /* best sector size for perf */
1276 __u32 max_chunks;
1277 __u32 max_bytes_chunk;
1278 __u32 max_bytes_copy;
1279 __u32 max_cached_dirs;
1280 #ifdef CONFIG_CIFS_FSCACHE
1281 u64 resource_id; /* server resource id */
1282 bool fscache_acquired; /* T if we've tried acquiring a cookie */
1283 struct fscache_volume *fscache; /* cookie for share */
1284 struct mutex fscache_lock; /* Prevent regetting a cookie */
1285 #endif
1286 struct list_head pending_opens; /* list of incomplete opens */
1287 struct cached_fids *cfids;
1288 /* BB add field for back pointer to sb struct(s)? */
1289 #ifdef CONFIG_CIFS_DFS_UPCALL
1290 struct delayed_work dfs_cache_work;
1291 #endif
1292 struct delayed_work query_interfaces; /* query interfaces workqueue job */
1293 char *origin_fullpath; /* canonical copy of smb3_fs_context::source */
1294 };
1295
1296 /*
1297 * This is a refcounted and timestamped container for a tcon pointer. The
1298 * container holds a tcon reference. It is considered safe to free one of
1299 * these when the tl_count goes to 0. The tl_time is the time of the last
1300 * "get" on the container.
1301 */
1302 struct tcon_link {
1303 struct rb_node tl_rbnode;
1304 kuid_t tl_uid;
1305 unsigned long tl_flags;
1306 #define TCON_LINK_MASTER 0
1307 #define TCON_LINK_PENDING 1
1308 #define TCON_LINK_IN_TREE 2
1309 unsigned long tl_time;
1310 atomic_t tl_count;
1311 struct cifs_tcon *tl_tcon;
1312 };
1313
1314 extern struct tcon_link *cifs_sb_tlink(struct cifs_sb_info *cifs_sb);
1315 extern void smb3_free_compound_rqst(int num_rqst, struct smb_rqst *rqst);
1316
1317 static inline struct cifs_tcon *
1318 tlink_tcon(struct tcon_link *tlink)
1319 {
1320 return tlink->tl_tcon;
1321 }
1322
1323 static inline struct tcon_link *
1324 cifs_sb_master_tlink(struct cifs_sb_info *cifs_sb)
1325 {
1326 return cifs_sb->master_tlink;
1327 }
1328
1329 extern void cifs_put_tlink(struct tcon_link *tlink);
1330
1331 static inline struct tcon_link *
1332 cifs_get_tlink(struct tcon_link *tlink)
1333 {
1334 if (tlink && !IS_ERR(tlink))
1335 atomic_inc(&tlink->tl_count);
1336 return tlink;
1337 }
1338
1339 /* This function is always expected to succeed */
1340 extern struct cifs_tcon *cifs_sb_master_tcon(struct cifs_sb_info *cifs_sb);
1341
1342 #define CIFS_OPLOCK_NO_CHANGE 0xfe
1343
1344 struct cifs_pending_open {
1345 struct list_head olist;
1346 struct tcon_link *tlink;
1347 __u8 lease_key[16];
1348 __u32 oplock;
1349 };
1350
1351 struct cifs_deferred_close {
1352 struct list_head dlist;
1353 struct tcon_link *tlink;
1354 __u16 netfid;
1355 __u64 persistent_fid;
1356 __u64 volatile_fid;
1357 };
1358
1359 /*
1360 * This info hangs off the cifsFileInfo structure, pointed to by llist.
1361 * This is used to track byte stream locks on the file
1362 */
1363 struct cifsLockInfo {
1364 struct list_head llist; /* pointer to next cifsLockInfo */
1365 struct list_head blist; /* pointer to locks blocked on this */
1366 wait_queue_head_t block_q;
1367 __u64 offset;
1368 __u64 length;
1369 __u32 pid;
1370 __u16 type;
1371 __u16 flags;
1372 };
1373
1374 /*
1375 * One of these for each open instance of a file
1376 */
1377 struct cifs_search_info {
1378 loff_t index_of_last_entry;
1379 __u16 entries_in_buffer;
1380 __u16 info_level;
1381 __u32 resume_key;
1382 char *ntwrk_buf_start;
1383 char *srch_entries_start;
1384 char *last_entry;
1385 const char *presume_name;
1386 unsigned int resume_name_len;
1387 bool endOfSearch:1;
1388 bool emptyDir:1;
1389 bool unicode:1;
1390 bool smallBuf:1; /* so we know which buf_release function to call */
1391 };
1392
1393 #define ACL_NO_MODE ((umode_t)(-1))
1394 struct cifs_open_parms {
1395 struct cifs_tcon *tcon;
1396 struct cifs_sb_info *cifs_sb;
1397 int disposition;
1398 int desired_access;
1399 int create_options;
1400 const char *path;
1401 struct cifs_fid *fid;
1402 umode_t mode;
1403 bool reconnect:1;
1404 bool replay:1; /* indicates that this open is for a replay */
1405 struct kvec *ea_cctx;
1406 };
1407
1408 struct cifs_fid {
1409 __u16 netfid;
1410 __u64 persistent_fid; /* persist file id for smb2 */
1411 __u64 volatile_fid; /* volatile file id for smb2 */
1412 __u8 lease_key[SMB2_LEASE_KEY_SIZE]; /* lease key for smb2 */
1413 __u8 create_guid[16];
1414 __u32 access;
1415 struct cifs_pending_open *pending_open;
1416 unsigned int epoch;
1417 #ifdef CONFIG_CIFS_DEBUG2
1418 __u64 mid;
1419 #endif /* CIFS_DEBUG2 */
1420 bool purge_cache;
1421 };
1422
1423 struct cifs_fid_locks {
1424 struct list_head llist;
1425 struct cifsFileInfo *cfile; /* fid that owns locks */
1426 struct list_head locks; /* locks held by fid above */
1427 };
1428
1429 struct cifsFileInfo {
1430 /* following two lists are protected by tcon->open_file_lock */
1431 struct list_head tlist; /* pointer to next fid owned by tcon */
1432 struct list_head flist; /* next fid (file instance) for this inode */
1433 /* lock list below protected by cifsi->lock_sem */
1434 struct cifs_fid_locks *llist; /* brlocks held by this fid */
1435 kuid_t uid; /* allows finding which FileInfo structure */
1436 __u32 pid; /* process id who opened file */
1437 struct cifs_fid fid; /* file id from remote */
1438 struct list_head rlist; /* reconnect list */
1439 /* BB add lock scope info here if needed */
1440 /* lock scope id (0 if none) */
1441 struct dentry *dentry;
1442 struct tcon_link *tlink;
1443 unsigned int f_flags;
1444 bool invalidHandle:1; /* file closed via session abend */
1445 bool swapfile:1;
1446 bool oplock_break_cancelled:1;
1447 bool status_file_deleted:1; /* file has been deleted */
1448 bool offload:1; /* offload final part of _put to a wq */
1449 unsigned int oplock_epoch; /* epoch from the lease break */
1450 __u32 oplock_level; /* oplock/lease level from the lease break */
1451 int count;
1452 spinlock_t file_info_lock; /* protects four flag/count fields above */
1453 struct mutex fh_mutex; /* prevents reopen race after dead ses*/
1454 struct cifs_search_info srch_inf;
1455 struct work_struct oplock_break; /* work for oplock breaks */
1456 struct work_struct put; /* work for the final part of _put */
1457 struct work_struct serverclose; /* work for serverclose */
1458 struct delayed_work deferred;
1459 bool deferred_close_scheduled; /* Flag to indicate close is scheduled */
1460 char *symlink_target;
1461 };
1462
1463 struct cifs_io_parms {
1464 __u16 netfid;
1465 __u64 persistent_fid; /* persist file id for smb2 */
1466 __u64 volatile_fid; /* volatile file id for smb2 */
1467 __u32 pid;
1468 __u64 offset;
1469 unsigned int length;
1470 struct cifs_tcon *tcon;
1471 struct TCP_Server_Info *server;
1472 };
1473
1474 struct cifs_io_request {
1475 struct netfs_io_request rreq;
1476 struct cifsFileInfo *cfile;
1477 struct TCP_Server_Info *server;
1478 pid_t pid;
1479 };
1480
1481 /* asynchronous read support */
1482 struct cifs_io_subrequest {
1483 union {
1484 struct netfs_io_subrequest subreq;
1485 struct netfs_io_request *rreq;
1486 struct cifs_io_request *req;
1487 };
1488 ssize_t got_bytes;
1489 unsigned int xid;
1490 int result;
1491 bool have_xid;
1492 bool replay;
1493 struct kvec iov[2];
1494 struct TCP_Server_Info *server;
1495 #ifdef CONFIG_CIFS_SMB_DIRECT
1496 struct smbd_mr *mr;
1497 #endif
1498 struct cifs_credits credits;
1499 };
1500
1501 /*
1502 * Take a reference on the file private data. Must be called with
1503 * cfile->file_info_lock held.
1504 */
1505 static inline void
1506 cifsFileInfo_get_locked(struct cifsFileInfo *cifs_file)
1507 {
1508 ++cifs_file->count;
1509 }
1510
1511 struct cifsFileInfo *cifsFileInfo_get(struct cifsFileInfo *cifs_file);
1512 void _cifsFileInfo_put(struct cifsFileInfo *cifs_file, bool wait_oplock_hdlr,
1513 bool offload);
1514 void cifsFileInfo_put(struct cifsFileInfo *cifs_file);
1515
1516 #define CIFS_CACHE_READ_FLG 1
1517 #define CIFS_CACHE_HANDLE_FLG 2
1518 #define CIFS_CACHE_RH_FLG (CIFS_CACHE_READ_FLG | CIFS_CACHE_HANDLE_FLG)
1519 #define CIFS_CACHE_WRITE_FLG 4
1520 #define CIFS_CACHE_RW_FLG (CIFS_CACHE_READ_FLG | CIFS_CACHE_WRITE_FLG)
1521 #define CIFS_CACHE_RHW_FLG (CIFS_CACHE_RW_FLG | CIFS_CACHE_HANDLE_FLG)
1522
1523 #define CIFS_CACHE_READ(cinode) ((cinode->oplock & CIFS_CACHE_READ_FLG) || (CIFS_SB(cinode->netfs.inode.i_sb)->mnt_cifs_flags & CIFS_MOUNT_RO_CACHE))
1524 #define CIFS_CACHE_HANDLE(cinode) (cinode->oplock & CIFS_CACHE_HANDLE_FLG)
1525 #define CIFS_CACHE_WRITE(cinode) ((cinode->oplock & CIFS_CACHE_WRITE_FLG) || (CIFS_SB(cinode->netfs.inode.i_sb)->mnt_cifs_flags & CIFS_MOUNT_RW_CACHE))
1526
1527 /*
1528 * One of these for each file inode
1529 */
1530
1531 struct cifsInodeInfo {
1532 struct netfs_inode netfs; /* Netfslib context and vfs inode */
1533 bool can_cache_brlcks;
1534 struct list_head llist; /* locks helb by this inode */
1535 /*
1536 * NOTE: Some code paths call down_read(lock_sem) twice, so
1537 * we must always use cifs_down_write() instead of down_write()
1538 * for this semaphore to avoid deadlocks.
1539 */
1540 struct rw_semaphore lock_sem; /* protect the fields above */
1541 /* BB add in lists for dirty pages i.e. write caching info for oplock */
1542 struct list_head openFileList;
1543 spinlock_t open_file_lock; /* protects openFileList */
1544 __u32 cifsAttrs; /* e.g. DOS archive bit, sparse, compressed, system */
1545 unsigned int oplock; /* oplock/lease level we have */
1546 unsigned int epoch; /* used to track lease state changes */
1547 #define CIFS_INODE_PENDING_OPLOCK_BREAK (0) /* oplock break in progress */
1548 #define CIFS_INODE_PENDING_WRITERS (1) /* Writes in progress */
1549 #define CIFS_INODE_FLAG_UNUSED (2) /* Unused flag */
1550 #define CIFS_INO_DELETE_PENDING (3) /* delete pending on server */
1551 #define CIFS_INO_INVALID_MAPPING (4) /* pagecache is invalid */
1552 #define CIFS_INO_LOCK (5) /* lock bit for synchronization */
1553 #define CIFS_INO_MODIFIED_ATTR (6) /* Indicate change in mtime/ctime */
1554 #define CIFS_INO_CLOSE_ON_LOCK (7) /* Not to defer the close when lock is set */
1555 unsigned long flags;
1556 spinlock_t writers_lock;
1557 unsigned int writers; /* Number of writers on this inode */
1558 unsigned long time; /* jiffies of last update of inode */
1559 u64 uniqueid; /* server inode number */
1560 u64 createtime; /* creation time on server */
1561 __u8 lease_key[SMB2_LEASE_KEY_SIZE]; /* lease key for this inode */
1562 struct list_head deferred_closes; /* list of deferred closes */
1563 spinlock_t deferred_lock; /* protection on deferred list */
1564 bool lease_granted; /* Flag to indicate whether lease or oplock is granted. */
1565 char *symlink_target;
1566 __u32 reparse_tag;
1567 };
1568
1569 static inline struct cifsInodeInfo *
1570 CIFS_I(struct inode *inode)
1571 {
1572 return container_of(inode, struct cifsInodeInfo, netfs.inode);
1573 }
1574
1575 static inline struct cifs_sb_info *
1576 CIFS_SB(struct super_block *sb)
1577 {
1578 return sb->s_fs_info;
1579 }
1580
1581 static inline struct cifs_sb_info *
1582 CIFS_FILE_SB(struct file *file)
1583 {
1584 return CIFS_SB(file_inode(file)->i_sb);
1585 }
1586
1587 static inline char CIFS_DIR_SEP(const struct cifs_sb_info *cifs_sb)
1588 {
1589 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_POSIX_PATHS)
1590 return '/';
1591 else
1592 return '\\';
1593 }
1594
1595 static inline void
1596 convert_delimiter(char *path, char delim)
1597 {
1598 char old_delim, *pos;
1599
1600 if (delim == '/')
1601 old_delim = '\\';
1602 else
1603 old_delim = '/';
1604
1605 pos = path;
1606 while ((pos = strchr(pos, old_delim)))
1607 *pos = delim;
1608 }
1609
1610 #define cifs_stats_inc atomic_inc
1611
1612 static inline void cifs_stats_bytes_written(struct cifs_tcon *tcon,
1613 unsigned int bytes)
1614 {
1615 if (bytes) {
1616 spin_lock(&tcon->stat_lock);
1617 tcon->bytes_written += bytes;
1618 spin_unlock(&tcon->stat_lock);
1619 }
1620 }
1621
1622 static inline void cifs_stats_bytes_read(struct cifs_tcon *tcon,
1623 unsigned int bytes)
1624 {
1625 spin_lock(&tcon->stat_lock);
1626 tcon->bytes_read += bytes;
1627 spin_unlock(&tcon->stat_lock);
1628 }
1629
1630
1631 /*
1632 * This is the prototype for the mid receive function. This function is for
1633 * receiving the rest of the SMB frame, starting with the WordCount (which is
1634 * just after the MID in struct smb_hdr). Note:
1635 *
1636 * - This will be called by cifsd, with no locks held.
1637 * - The mid will still be on the pending_mid_q.
1638 * - mid->resp_buf will point to the current buffer.
1639 *
1640 * Returns zero on a successful receive, or an error. The receive state in
1641 * the TCP_Server_Info will also be updated.
1642 */
1643 typedef int (mid_receive_t)(struct TCP_Server_Info *server,
1644 struct mid_q_entry *mid);
1645
1646 /*
1647 * This is the prototype for the mid callback function. This is called once the
1648 * mid has been received off of the socket. When creating one, take special
1649 * care to avoid deadlocks. Things to bear in mind:
1650 *
1651 * - it will be called by cifsd, with no locks held
1652 * - the mid will be removed from any lists
1653 */
1654 typedef void (mid_callback_t)(struct mid_q_entry *mid);
1655
1656 /*
1657 * This is the protopyte for mid handle function. This is called once the mid
1658 * has been recognized after decryption of the message.
1659 */
1660 typedef int (mid_handle_t)(struct TCP_Server_Info *server,
1661 struct mid_q_entry *mid);
1662
1663 /* one of these for every pending CIFS request to the server */
1664 struct mid_q_entry {
1665 struct list_head qhead; /* mids waiting on reply from this server */
1666 struct kref refcount;
1667 struct TCP_Server_Info *server; /* server corresponding to this mid */
1668 __u64 mid; /* multiplex id */
1669 __u16 credits; /* number of credits consumed by this mid */
1670 __u16 credits_received; /* number of credits from the response */
1671 __u32 pid; /* process id */
1672 __u32 sequence_number; /* for CIFS signing */
1673 unsigned long when_alloc; /* when mid was created */
1674 #ifdef CONFIG_CIFS_STATS2
1675 unsigned long when_sent; /* time when smb send finished */
1676 unsigned long when_received; /* when demux complete (taken off wire) */
1677 #endif
1678 mid_receive_t *receive; /* call receive callback */
1679 mid_callback_t *callback; /* call completion callback */
1680 mid_handle_t *handle; /* call handle mid callback */
1681 void *callback_data; /* general purpose pointer for callback */
1682 struct task_struct *creator;
1683 void *resp_buf; /* pointer to received SMB header */
1684 unsigned int resp_buf_size;
1685 int mid_state; /* wish this were enum but can not pass to wait_event */
1686 unsigned int mid_flags;
1687 __le16 command; /* smb command code */
1688 unsigned int optype; /* operation type */
1689 bool large_buf:1; /* if valid response, is pointer to large buf */
1690 bool multiRsp:1; /* multiple trans2 responses for one request */
1691 bool multiEnd:1; /* both received */
1692 bool decrypted:1; /* decrypted entry */
1693 };
1694
1695 struct close_cancelled_open {
1696 struct cifs_fid fid;
1697 struct cifs_tcon *tcon;
1698 struct work_struct work;
1699 __u64 mid;
1700 __u16 cmd;
1701 };
1702
1703 /* Make code in transport.c a little cleaner by moving
1704 update of optional stats into function below */
1705 static inline void cifs_in_send_inc(struct TCP_Server_Info *server)
1706 {
1707 atomic_inc(&server->in_send);
1708 }
1709
1710 static inline void cifs_in_send_dec(struct TCP_Server_Info *server)
1711 {
1712 atomic_dec(&server->in_send);
1713 }
1714
1715 static inline void cifs_num_waiters_inc(struct TCP_Server_Info *server)
1716 {
1717 atomic_inc(&server->num_waiters);
1718 }
1719
1720 static inline void cifs_num_waiters_dec(struct TCP_Server_Info *server)
1721 {
1722 atomic_dec(&server->num_waiters);
1723 }
1724
1725 #ifdef CONFIG_CIFS_STATS2
1726 static inline void cifs_save_when_sent(struct mid_q_entry *mid)
1727 {
1728 mid->when_sent = jiffies;
1729 }
1730 #else
1731 static inline void cifs_save_when_sent(struct mid_q_entry *mid)
1732 {
1733 }
1734 #endif
1735
1736 /* for pending dnotify requests */
1737 struct dir_notify_req {
1738 struct list_head lhead;
1739 __le16 Pid;
1740 __le16 PidHigh;
1741 __u16 Mid;
1742 __u16 Tid;
1743 __u16 Uid;
1744 __u16 netfid;
1745 __u32 filter; /* CompletionFilter (for multishot) */
1746 int multishot;
1747 struct file *pfile;
1748 };
1749
1750 struct dfs_info3_param {
1751 int flags; /* DFSREF_REFERRAL_SERVER, DFSREF_STORAGE_SERVER*/
1752 int path_consumed;
1753 int server_type;
1754 int ref_flag;
1755 char *path_name;
1756 char *node_name;
1757 int ttl;
1758 };
1759
1760 struct file_list {
1761 struct list_head list;
1762 struct cifsFileInfo *cfile;
1763 };
1764
1765 struct cifs_mount_ctx {
1766 struct cifs_sb_info *cifs_sb;
1767 struct smb3_fs_context *fs_ctx;
1768 unsigned int xid;
1769 struct TCP_Server_Info *server;
1770 struct cifs_ses *ses;
1771 struct cifs_tcon *tcon;
1772 };
1773
1774 static inline void __free_dfs_info_param(struct dfs_info3_param *param)
1775 {
1776 kfree(param->path_name);
1777 kfree(param->node_name);
1778 }
1779
1780 static inline void free_dfs_info_param(struct dfs_info3_param *param)
1781 {
1782 if (param)
1783 __free_dfs_info_param(param);
1784 }
1785
1786 static inline void zfree_dfs_info_param(struct dfs_info3_param *param)
1787 {
1788 if (param) {
1789 __free_dfs_info_param(param);
1790 memset(param, 0, sizeof(*param));
1791 }
1792 }
1793
1794 static inline void free_dfs_info_array(struct dfs_info3_param *param,
1795 int number_of_items)
1796 {
1797 int i;
1798
1799 if ((number_of_items == 0) || (param == NULL))
1800 return;
1801 for (i = 0; i < number_of_items; i++) {
1802 kfree(param[i].path_name);
1803 kfree(param[i].node_name);
1804 }
1805 kfree(param);
1806 }
1807
1808 static inline bool is_interrupt_error(int error)
1809 {
1810 switch (error) {
1811 case -EINTR:
1812 case -ERESTARTSYS:
1813 case -ERESTARTNOHAND:
1814 case -ERESTARTNOINTR:
1815 return true;
1816 }
1817 return false;
1818 }
1819
1820 static inline bool is_retryable_error(int error)
1821 {
1822 if (is_interrupt_error(error) || error == -EAGAIN)
1823 return true;
1824 return false;
1825 }
1826
1827 static inline bool is_replayable_error(int error)
1828 {
1829 if (error == -EAGAIN || error == -ECONNABORTED)
1830 return true;
1831 return false;
1832 }
1833
1834
1835 /* cifs_get_writable_file() flags */
1836 #define FIND_WR_ANY 0
1837 #define FIND_WR_FSUID_ONLY 1
1838 #define FIND_WR_WITH_DELETE 2
1839
1840 #define MID_FREE 0
1841 #define MID_REQUEST_ALLOCATED 1
1842 #define MID_REQUEST_SUBMITTED 2
1843 #define MID_RESPONSE_RECEIVED 4
1844 #define MID_RETRY_NEEDED 8 /* session closed while this request out */
1845 #define MID_RESPONSE_MALFORMED 0x10
1846 #define MID_SHUTDOWN 0x20
1847 #define MID_RESPONSE_READY 0x40 /* ready for other process handle the rsp */
1848
1849 /* Flags */
1850 #define MID_WAIT_CANCELLED 1 /* Cancelled while waiting for response */
1851 #define MID_DELETED 2 /* Mid has been dequeued/deleted */
1852
1853 /* Types of response buffer returned from SendReceive2 */
1854 #define CIFS_NO_BUFFER 0 /* Response buffer not returned */
1855 #define CIFS_SMALL_BUFFER 1
1856 #define CIFS_LARGE_BUFFER 2
1857 #define CIFS_IOVEC 4 /* array of response buffers */
1858
1859 /* Type of Request to SendReceive2 */
1860 #define CIFS_BLOCKING_OP 1 /* operation can block */
1861 #define CIFS_NON_BLOCKING 2 /* do not block waiting for credits */
1862 #define CIFS_TIMEOUT_MASK 0x003 /* only one of above set in req */
1863 #define CIFS_LOG_ERROR 0x010 /* log NT STATUS if non-zero */
1864 #define CIFS_LARGE_BUF_OP 0x020 /* large request buffer */
1865 #define CIFS_NO_RSP_BUF 0x040 /* no response buffer required */
1866
1867 /* Type of request operation */
1868 #define CIFS_ECHO_OP 0x080 /* echo request */
1869 #define CIFS_OBREAK_OP 0x0100 /* oplock break request */
1870 #define CIFS_NEG_OP 0x0200 /* negotiate request */
1871 #define CIFS_CP_CREATE_CLOSE_OP 0x0400 /* compound create+close request */
1872 /* Lower bitmask values are reserved by others below. */
1873 #define CIFS_SESS_OP 0x2000 /* session setup request */
1874 #define CIFS_OP_MASK 0x2780 /* mask request type */
1875
1876 #define CIFS_HAS_CREDITS 0x0400 /* already has credits */
1877 #define CIFS_TRANSFORM_REQ 0x0800 /* transform request before sending */
1878 #define CIFS_NO_SRV_RSP 0x1000 /* there is no server response */
1879
1880 /* Security Flags: indicate type of session setup needed */
1881 #define CIFSSEC_MAY_SIGN 0x00001
1882 #define CIFSSEC_MAY_NTLMV2 0x00004
1883 #define CIFSSEC_MAY_KRB5 0x00008
1884 #define CIFSSEC_MAY_SEAL 0x00040
1885 #define CIFSSEC_MAY_NTLMSSP 0x00080 /* raw ntlmssp with ntlmv2 */
1886
1887 #define CIFSSEC_MUST_SIGN 0x01001
1888 /* note that only one of the following can be set so the
1889 result of setting MUST flags more than once will be to
1890 require use of the stronger protocol */
1891 #define CIFSSEC_MUST_NTLMV2 0x04004
1892 #define CIFSSEC_MUST_KRB5 0x08008
1893 #ifdef CONFIG_CIFS_UPCALL
1894 #define CIFSSEC_MASK 0xCF0CF /* flags supported if no weak allowed */
1895 #else
1896 #define CIFSSEC_MASK 0xC70C7 /* flags supported if no weak allowed */
1897 #endif /* UPCALL */
1898 #define CIFSSEC_MUST_SEAL 0x40040
1899 #define CIFSSEC_MUST_NTLMSSP 0x80080 /* raw ntlmssp with ntlmv2 */
1900
1901 #define CIFSSEC_DEF (CIFSSEC_MAY_SIGN | CIFSSEC_MAY_NTLMV2 | CIFSSEC_MAY_NTLMSSP | CIFSSEC_MAY_SEAL)
1902 #define CIFSSEC_MAX (CIFSSEC_MAY_SIGN | CIFSSEC_MUST_KRB5 | CIFSSEC_MAY_SEAL)
1903 #define CIFSSEC_AUTH_MASK (CIFSSEC_MAY_NTLMV2 | CIFSSEC_MAY_KRB5 | CIFSSEC_MAY_NTLMSSP)
1904 /*
1905 *****************************************************************
1906 * All constants go here
1907 *****************************************************************
1908 */
1909
1910 #define UID_HASH (16)
1911
1912 /*
1913 * Note that ONE module should define _DECLARE_GLOBALS_HERE to cause the
1914 * following to be declared.
1915 */
1916
1917 /****************************************************************************
1918 * Here are all the locks (spinlock, mutex, semaphore) in cifs.ko, arranged according
1919 * to the locking order. i.e. if two locks are to be held together, the lock that
1920 * appears higher in this list needs to be taken before the other.
1921 *
1922 * If you hold a lock that is lower in this list, and you need to take a higher lock
1923 * (or if you think that one of the functions that you're calling may need to), first
1924 * drop the lock you hold, pick up the higher lock, then the lower one. This will
1925 * ensure that locks are picked up only in one direction in the below table
1926 * (top to bottom).
1927 *
1928 * Also, if you expect a function to be called with a lock held, explicitly document
1929 * this in the comments on top of your function definition.
1930 *
1931 * And also, try to keep the critical sections (lock hold time) to be as minimal as
1932 * possible. Blocking / calling other functions with a lock held always increase
1933 * the risk of a possible deadlock.
1934 *
1935 * Following this rule will avoid unnecessary deadlocks, which can get really hard to
1936 * debug. Also, any new lock that you introduce, please add to this list in the correct
1937 * order.
1938 *
1939 * Please populate this list whenever you introduce new locks in your changes. Or in
1940 * case I've missed some existing locks. Please ensure that it's added in the list
1941 * based on the locking order expected.
1942 *
1943 * =====================================================================================
1944 * Lock Protects Initialization fn
1945 * =====================================================================================
1946 * vol_list_lock
1947 * vol_info->ctx_lock vol_info->ctx
1948 * cifs_sb_info->tlink_tree_lock cifs_sb_info->tlink_tree cifs_setup_cifs_sb
1949 * TCP_Server_Info-> TCP_Server_Info cifs_get_tcp_session
1950 * reconnect_mutex
1951 * TCP_Server_Info->srv_mutex TCP_Server_Info cifs_get_tcp_session
1952 * cifs_ses->session_mutex cifs_ses sesInfoAlloc
1953 * cifs_tcon
1954 * cifs_tcon->open_file_lock cifs_tcon->openFileList tconInfoAlloc
1955 * cifs_tcon->pending_opens
1956 * cifs_tcon->stat_lock cifs_tcon->bytes_read tconInfoAlloc
1957 * cifs_tcon->bytes_written
1958 * cifs_tcp_ses_lock cifs_tcp_ses_list sesInfoAlloc
1959 * GlobalMid_Lock GlobalMaxActiveXid init_cifs
1960 * GlobalCurrentXid
1961 * GlobalTotalActiveXid
1962 * TCP_Server_Info->srv_lock (anything in struct not protected by another lock and can change)
1963 * TCP_Server_Info->mid_lock TCP_Server_Info->pending_mid_q cifs_get_tcp_session
1964 * ->CurrentMid
1965 * (any changes in mid_q_entry fields)
1966 * TCP_Server_Info->req_lock TCP_Server_Info->in_flight cifs_get_tcp_session
1967 * ->credits
1968 * ->echo_credits
1969 * ->oplock_credits
1970 * ->reconnect_instance
1971 * cifs_ses->ses_lock (anything that is not protected by another lock and can change)
1972 * cifs_ses->iface_lock cifs_ses->iface_list sesInfoAlloc
1973 * ->iface_count
1974 * ->iface_last_update
1975 * cifs_ses->chan_lock cifs_ses->chans
1976 * ->chans_need_reconnect
1977 * ->chans_in_reconnect
1978 * cifs_tcon->tc_lock (anything that is not protected by another lock and can change)
1979 * inode->i_rwsem, taken by fs/netfs/locking.c e.g. should be taken before cifsInodeInfo locks
1980 * cifsInodeInfo->open_file_lock cifsInodeInfo->openFileList cifs_alloc_inode
1981 * cifsInodeInfo->writers_lock cifsInodeInfo->writers cifsInodeInfo_alloc
1982 * cifsInodeInfo->lock_sem cifsInodeInfo->llist cifs_init_once
1983 * ->can_cache_brlcks
1984 * cifsInodeInfo->deferred_lock cifsInodeInfo->deferred_closes cifsInodeInfo_alloc
1985 * cached_fid->fid_mutex cifs_tcon->crfid tcon_info_alloc
1986 * cifsFileInfo->fh_mutex cifsFileInfo cifs_new_fileinfo
1987 * cifsFileInfo->file_info_lock cifsFileInfo->count cifs_new_fileinfo
1988 * ->invalidHandle initiate_cifs_search
1989 * ->oplock_break_cancelled
1990 ****************************************************************************/
1991
1992 #ifdef DECLARE_GLOBALS_HERE
1993 #define GLOBAL_EXTERN
1994 #else
1995 #define GLOBAL_EXTERN extern
1996 #endif
1997
1998 /*
1999 * the list of TCP_Server_Info structures, ie each of the sockets
2000 * connecting our client to a distinct server (ip address), is
2001 * chained together by cifs_tcp_ses_list. The list of all our SMB
2002 * sessions (and from that the tree connections) can be found
2003 * by iterating over cifs_tcp_ses_list
2004 */
2005 extern struct list_head cifs_tcp_ses_list;
2006
2007 /*
2008 * This lock protects the cifs_tcp_ses_list, the list of smb sessions per
2009 * tcp session, and the list of tcon's per smb session. It also protects
2010 * the reference counters for the server, smb session, and tcon.
2011 * generally the locks should be taken in order tcp_ses_lock before
2012 * tcon->open_file_lock and that before file->file_info_lock since the
2013 * structure order is cifs_socket-->cifs_ses-->cifs_tcon-->cifs_file
2014 */
2015 extern spinlock_t cifs_tcp_ses_lock;
2016
2017 /*
2018 * Global transaction id (XID) information
2019 */
2020 extern unsigned int GlobalCurrentXid; /* protected by GlobalMid_Sem */
2021 extern unsigned int GlobalTotalActiveXid; /* prot by GlobalMid_Sem */
2022 extern unsigned int GlobalMaxActiveXid; /* prot by GlobalMid_Sem */
2023 extern spinlock_t GlobalMid_Lock; /* protects above & list operations on midQ entries */
2024
2025 /*
2026 * Global counters, updated atomically
2027 */
2028 extern atomic_t sesInfoAllocCount;
2029 extern atomic_t tconInfoAllocCount;
2030 extern atomic_t tcpSesNextId;
2031 extern atomic_t tcpSesAllocCount;
2032 extern atomic_t tcpSesReconnectCount;
2033 extern atomic_t tconInfoReconnectCount;
2034
2035 /* Various Debug counters */
2036 extern atomic_t buf_alloc_count; /* current number allocated */
2037 extern atomic_t small_buf_alloc_count;
2038 #ifdef CONFIG_CIFS_STATS2
2039 extern atomic_t total_buf_alloc_count; /* total allocated over all time */
2040 extern atomic_t total_small_buf_alloc_count;
2041 extern unsigned int slow_rsp_threshold; /* number of secs before logging */
2042 #endif
2043
2044 /* Misc globals */
2045 extern bool enable_oplocks; /* enable or disable oplocks */
2046 extern bool lookupCacheEnabled;
2047 extern unsigned int global_secflags; /* if on, session setup sent
2048 with more secure ntlmssp2 challenge/resp */
2049 extern unsigned int sign_CIFS_PDUs; /* enable smb packet signing */
2050 extern bool enable_gcm_256; /* allow optional negotiate of strongest signing (aes-gcm-256) */
2051 extern bool require_gcm_256; /* require use of strongest signing (aes-gcm-256) */
2052 extern bool enable_negotiate_signing; /* request use of faster (GMAC) signing if available */
2053 extern bool linuxExtEnabled;/*enable Linux/Unix CIFS extensions*/
2054 extern unsigned int CIFSMaxBufSize; /* max size not including hdr */
2055 extern unsigned int cifs_min_rcv; /* min size of big ntwrk buf pool */
2056 extern unsigned int cifs_min_small; /* min size of small buf pool */
2057 extern unsigned int cifs_max_pending; /* MAX requests at once to server*/
2058 extern unsigned int dir_cache_timeout; /* max time for directory lease caching of dir */
2059 extern bool disable_legacy_dialects; /* forbid vers=1.0 and vers=2.0 mounts */
2060 extern atomic_t mid_count;
2061
2062 void cifs_oplock_break(struct work_struct *work);
2063 void cifs_queue_oplock_break(struct cifsFileInfo *cfile);
2064 void smb2_deferred_work_close(struct work_struct *work);
2065
2066 extern const struct slow_work_ops cifs_oplock_break_ops;
2067 extern struct workqueue_struct *cifsiod_wq;
2068 extern struct workqueue_struct *decrypt_wq;
2069 extern struct workqueue_struct *fileinfo_put_wq;
2070 extern struct workqueue_struct *cifsoplockd_wq;
2071 extern struct workqueue_struct *deferredclose_wq;
2072 extern struct workqueue_struct *serverclose_wq;
2073 extern __u32 cifs_lock_secret;
2074
2075 extern mempool_t *cifs_sm_req_poolp;
2076 extern mempool_t *cifs_req_poolp;
2077 extern mempool_t *cifs_mid_poolp;
2078 extern mempool_t cifs_io_request_pool;
2079 extern mempool_t cifs_io_subrequest_pool;
2080
2081 /* Operations for different SMB versions */
2082 #define SMB1_VERSION_STRING "1.0"
2083 #define SMB20_VERSION_STRING "2.0"
2084 #ifdef CONFIG_CIFS_ALLOW_INSECURE_LEGACY
2085 extern struct smb_version_operations smb1_operations;
2086 extern struct smb_version_values smb1_values;
2087 extern struct smb_version_operations smb20_operations;
2088 extern struct smb_version_values smb20_values;
2089 #endif /* CIFS_ALLOW_INSECURE_LEGACY */
2090 #define SMB21_VERSION_STRING "2.1"
2091 extern struct smb_version_operations smb21_operations;
2092 extern struct smb_version_values smb21_values;
2093 #define SMBDEFAULT_VERSION_STRING "default"
2094 extern struct smb_version_values smbdefault_values;
2095 #define SMB3ANY_VERSION_STRING "3"
2096 extern struct smb_version_values smb3any_values;
2097 #define SMB30_VERSION_STRING "3.0"
2098 extern struct smb_version_operations smb30_operations;
2099 extern struct smb_version_values smb30_values;
2100 #define SMB302_VERSION_STRING "3.02"
2101 #define ALT_SMB302_VERSION_STRING "3.0.2"
2102 /*extern struct smb_version_operations smb302_operations;*/ /* not needed yet */
2103 extern struct smb_version_values smb302_values;
2104 #define SMB311_VERSION_STRING "3.1.1"
2105 #define ALT_SMB311_VERSION_STRING "3.11"
2106 extern struct smb_version_operations smb311_operations;
2107 extern struct smb_version_values smb311_values;
2108
2109 static inline char *get_security_type_str(enum securityEnum sectype)
2110 {
2111 switch (sectype) {
2112 case RawNTLMSSP:
2113 return "RawNTLMSSP";
2114 case Kerberos:
2115 return "Kerberos";
2116 case NTLMv2:
2117 return "NTLMv2";
2118 default:
2119 return "Unknown";
2120 }
2121 }
2122
2123 static inline bool is_smb1_server(struct TCP_Server_Info *server)
2124 {
2125 return strcmp(server->vals->version_string, SMB1_VERSION_STRING) == 0;
2126 }
2127
2128 static inline bool is_tcon_dfs(struct cifs_tcon *tcon)
2129 {
2130 /*
2131 * For SMB1, see MS-CIFS 2.4.55 SMB_COM_TREE_CONNECT_ANDX (0x75) and MS-CIFS 3.3.4.4 DFS
2132 * Subsystem Notifies That a Share Is a DFS Share.
2133 *
2134 * For SMB2+, see MS-SMB2 2.2.10 SMB2 TREE_CONNECT Response and MS-SMB2 3.3.4.14 Server
2135 * Application Updates a Share.
2136 */
2137 if (!tcon || !tcon->ses || !tcon->ses->server)
2138 return false;
2139 return is_smb1_server(tcon->ses->server) ? tcon->Flags & SMB_SHARE_IS_IN_DFS :
2140 tcon->share_flags & (SHI1005_FLAGS_DFS | SHI1005_FLAGS_DFS_ROOT);
2141 }
2142
2143 static inline bool cifs_is_referral_server(struct cifs_tcon *tcon,
2144 const struct dfs_info3_param *ref)
2145 {
2146 /*
2147 * Check if all targets are capable of handling DFS referrals as per
2148 * MS-DFSC 2.2.4 RESP_GET_DFS_REFERRAL.
2149 */
2150 return is_tcon_dfs(tcon) || (ref && (ref->flags & DFSREF_REFERRAL_SERVER));
2151 }
2152
2153 static inline u64 cifs_flock_len(const struct file_lock *fl)
2154 {
2155 return (u64)fl->fl_end - fl->fl_start + 1;
2156 }
2157
2158 static inline size_t ntlmssp_workstation_name_size(const struct cifs_ses *ses)
2159 {
2160 if (WARN_ON_ONCE(!ses || !ses->server))
2161 return 0;
2162 /*
2163 * Make workstation name no more than 15 chars when using insecure dialects as some legacy
2164 * servers do require it during NTLMSSP.
2165 */
2166 if (ses->server->dialect <= SMB20_PROT_ID)
2167 return min_t(size_t, sizeof(ses->workstation_name), RFC1001_NAME_LEN_WITH_NULL);
2168 return sizeof(ses->workstation_name);
2169 }
2170
2171 static inline void move_cifs_info_to_smb2(struct smb2_file_all_info *dst, const FILE_ALL_INFO *src)
2172 {
2173 memcpy(dst, src, (size_t)((u8 *)&src->AccessFlags - (u8 *)src));
2174 dst->AccessFlags = src->AccessFlags;
2175 dst->CurrentByteOffset = src->CurrentByteOffset;
2176 dst->Mode = src->Mode;
2177 dst->AlignmentRequirement = src->AlignmentRequirement;
2178 dst->FileNameLength = src->FileNameLength;
2179 }
2180
2181 static inline int cifs_get_num_sgs(const struct smb_rqst *rqst,
2182 int num_rqst,
2183 const u8 *sig)
2184 {
2185 unsigned int len, skip;
2186 unsigned int nents = 0;
2187 unsigned long addr;
2188 size_t data_size;
2189 int i, j;
2190
2191 /*
2192 * The first rqst has a transform header where the first 20 bytes are
2193 * not part of the encrypted blob.
2194 */
2195 skip = 20;
2196
2197 /* Assumes the first rqst has a transform header as the first iov.
2198 * I.e.
2199 * rqst[0].rq_iov[0] is transform header
2200 * rqst[0].rq_iov[1+] data to be encrypted/decrypted
2201 * rqst[1+].rq_iov[0+] data to be encrypted/decrypted
2202 */
2203 for (i = 0; i < num_rqst; i++) {
2204 data_size = iov_iter_count(&rqst[i].rq_iter);
2205
2206 /* We really don't want a mixture of pinned and unpinned pages
2207 * in the sglist. It's hard to keep track of which is what.
2208 * Instead, we convert to a BVEC-type iterator higher up.
2209 */
2210 if (data_size &&
2211 WARN_ON_ONCE(user_backed_iter(&rqst[i].rq_iter)))
2212 return -EIO;
2213
2214 /* We also don't want to have any extra refs or pins to clean
2215 * up in the sglist.
2216 */
2217 if (data_size &&
2218 WARN_ON_ONCE(iov_iter_extract_will_pin(&rqst[i].rq_iter)))
2219 return -EIO;
2220
2221 for (j = 0; j < rqst[i].rq_nvec; j++) {
2222 struct kvec *iov = &rqst[i].rq_iov[j];
2223
2224 addr = (unsigned long)iov->iov_base + skip;
2225 if (unlikely(is_vmalloc_addr((void *)addr))) {
2226 len = iov->iov_len - skip;
2227 nents += DIV_ROUND_UP(offset_in_page(addr) + len,
2228 PAGE_SIZE);
2229 } else {
2230 nents++;
2231 }
2232 skip = 0;
2233 }
2234 if (data_size)
2235 nents += iov_iter_npages(&rqst[i].rq_iter, INT_MAX);
2236 }
2237 nents += DIV_ROUND_UP(offset_in_page(sig) + SMB2_SIGNATURE_SIZE, PAGE_SIZE);
2238 return nents;
2239 }
2240
2241 /* We can not use the normal sg_set_buf() as we will sometimes pass a
2242 * stack object as buf.
2243 */
2244 static inline void cifs_sg_set_buf(struct sg_table *sgtable,
2245 const void *buf,
2246 unsigned int buflen)
2247 {
2248 unsigned long addr = (unsigned long)buf;
2249 unsigned int off = offset_in_page(addr);
2250
2251 addr &= PAGE_MASK;
2252 if (unlikely(is_vmalloc_addr((void *)addr))) {
2253 do {
2254 unsigned int len = min_t(unsigned int, buflen, PAGE_SIZE - off);
2255
2256 sg_set_page(&sgtable->sgl[sgtable->nents++],
2257 vmalloc_to_page((void *)addr), len, off);
2258
2259 off = 0;
2260 addr += PAGE_SIZE;
2261 buflen -= len;
2262 } while (buflen);
2263 } else {
2264 sg_set_page(&sgtable->sgl[sgtable->nents++],
2265 virt_to_page((void *)addr), buflen, off);
2266 }
2267 }
2268
2269 #define CIFS_OPARMS(_cifs_sb, _tcon, _path, _da, _cd, _co, _mode) \
2270 ((struct cifs_open_parms) { \
2271 .tcon = _tcon, \
2272 .path = _path, \
2273 .desired_access = (_da), \
2274 .disposition = (_cd), \
2275 .create_options = cifs_create_options(_cifs_sb, (_co)), \
2276 .mode = (_mode), \
2277 .cifs_sb = _cifs_sb, \
2278 })
2279
2280 struct smb2_compound_vars {
2281 struct cifs_open_parms oparms;
2282 struct kvec rsp_iov[MAX_COMPOUND];
2283 struct smb_rqst rqst[MAX_COMPOUND];
2284 struct kvec open_iov[SMB2_CREATE_IOV_SIZE];
2285 struct kvec qi_iov;
2286 struct kvec io_iov[SMB2_IOCTL_IOV_SIZE];
2287 struct kvec si_iov[SMB2_SET_INFO_IOV_SIZE];
2288 struct kvec close_iov;
2289 struct smb2_file_rename_info rename_info;
2290 struct smb2_file_link_info link_info;
2291 struct kvec ea_iov;
2292 };
2293
2294 static inline bool cifs_ses_exiting(struct cifs_ses *ses)
2295 {
2296 bool ret;
2297
2298 spin_lock(&ses->ses_lock);
2299 ret = ses->ses_status == SES_EXITING;
2300 spin_unlock(&ses->ses_lock);
2301 return ret;
2302 }
2303
2304 #endif /* _CIFS_GLOB_H */
2305
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