xref: /openbmc/linux/fs/smb/client/cifsglob.h (revision c7cd840b)
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_readdata;
272 struct cifs_writedata;
273 struct cifs_io_parms;
274 struct cifs_search_info;
275 struct cifsInodeInfo;
276 struct cifs_open_parms;
277 struct cifs_credits;
278 
279 struct smb_version_operations {
280 	int (*send_cancel)(struct TCP_Server_Info *, struct smb_rqst *,
281 			   struct mid_q_entry *);
282 	bool (*compare_fids)(struct cifsFileInfo *, struct cifsFileInfo *);
283 	/* setup request: allocate mid, sign message */
284 	struct mid_q_entry *(*setup_request)(struct cifs_ses *,
285 					     struct TCP_Server_Info *,
286 					     struct smb_rqst *);
287 	/* setup async request: allocate mid, sign message */
288 	struct mid_q_entry *(*setup_async_request)(struct TCP_Server_Info *,
289 						struct smb_rqst *);
290 	/* check response: verify signature, map error */
291 	int (*check_receive)(struct mid_q_entry *, struct TCP_Server_Info *,
292 			     bool);
293 	void (*add_credits)(struct TCP_Server_Info *server,
294 			    const struct cifs_credits *credits,
295 			    const int optype);
296 	void (*set_credits)(struct TCP_Server_Info *, const int);
297 	int * (*get_credits_field)(struct TCP_Server_Info *, const int);
298 	unsigned int (*get_credits)(struct mid_q_entry *);
299 	__u64 (*get_next_mid)(struct TCP_Server_Info *);
300 	void (*revert_current_mid)(struct TCP_Server_Info *server,
301 				   const unsigned int val);
302 	/* data offset from read response message */
303 	unsigned int (*read_data_offset)(char *);
304 	/*
305 	 * Data length from read response message
306 	 * When in_remaining is true, the returned data length is in
307 	 * message field DataRemaining for out-of-band data read (e.g through
308 	 * Memory Registration RDMA write in SMBD).
309 	 * Otherwise, the returned data length is in message field DataLength.
310 	 */
311 	unsigned int (*read_data_length)(char *, bool in_remaining);
312 	/* map smb to linux error */
313 	int (*map_error)(char *, bool);
314 	/* find mid corresponding to the response message */
315 	struct mid_q_entry * (*find_mid)(struct TCP_Server_Info *, char *);
316 	void (*dump_detail)(void *buf, struct TCP_Server_Info *ptcp_info);
317 	void (*clear_stats)(struct cifs_tcon *);
318 	void (*print_stats)(struct seq_file *m, struct cifs_tcon *);
319 	void (*dump_share_caps)(struct seq_file *, struct cifs_tcon *);
320 	/* verify the message */
321 	int (*check_message)(char *, unsigned int, struct TCP_Server_Info *);
322 	bool (*is_oplock_break)(char *, struct TCP_Server_Info *);
323 	int (*handle_cancelled_mid)(struct mid_q_entry *, struct TCP_Server_Info *);
324 	void (*downgrade_oplock)(struct TCP_Server_Info *server,
325 				 struct cifsInodeInfo *cinode, __u32 oplock,
326 				 unsigned int epoch, bool *purge_cache);
327 	/* process transaction2 response */
328 	bool (*check_trans2)(struct mid_q_entry *, struct TCP_Server_Info *,
329 			     char *, int);
330 	/* check if we need to negotiate */
331 	bool (*need_neg)(struct TCP_Server_Info *);
332 	/* negotiate to the server */
333 	int (*negotiate)(const unsigned int xid,
334 			 struct cifs_ses *ses,
335 			 struct TCP_Server_Info *server);
336 	/* set negotiated write size */
337 	unsigned int (*negotiate_wsize)(struct cifs_tcon *tcon, struct smb3_fs_context *ctx);
338 	/* set negotiated read size */
339 	unsigned int (*negotiate_rsize)(struct cifs_tcon *tcon, struct smb3_fs_context *ctx);
340 	/* setup smb sessionn */
341 	int (*sess_setup)(const unsigned int, struct cifs_ses *,
342 			  struct TCP_Server_Info *server,
343 			  const struct nls_table *);
344 	/* close smb session */
345 	int (*logoff)(const unsigned int, struct cifs_ses *);
346 	/* connect to a server share */
347 	int (*tree_connect)(const unsigned int, struct cifs_ses *, const char *,
348 			    struct cifs_tcon *, const struct nls_table *);
349 	/* close tree connecion */
350 	int (*tree_disconnect)(const unsigned int, struct cifs_tcon *);
351 	/* get DFS referrals */
352 	int (*get_dfs_refer)(const unsigned int, struct cifs_ses *,
353 			     const char *, struct dfs_info3_param **,
354 			     unsigned int *, const struct nls_table *, int);
355 	/* informational QFS call */
356 	void (*qfs_tcon)(const unsigned int, struct cifs_tcon *,
357 			 struct cifs_sb_info *);
358 	/* query for server interfaces */
359 	int (*query_server_interfaces)(const unsigned int, struct cifs_tcon *,
360 				       bool);
361 	/* check if a path is accessible or not */
362 	int (*is_path_accessible)(const unsigned int, struct cifs_tcon *,
363 				  struct cifs_sb_info *, const char *);
364 	/* query path data from the server */
365 	int (*query_path_info)(const unsigned int xid,
366 			       struct cifs_tcon *tcon,
367 			       struct cifs_sb_info *cifs_sb,
368 			       const char *full_path,
369 			       struct cifs_open_info_data *data);
370 	/* query file data from the server */
371 	int (*query_file_info)(const unsigned int xid, struct cifs_tcon *tcon,
372 			       struct cifsFileInfo *cfile, struct cifs_open_info_data *data);
373 	/* query reparse point to determine which type of special file */
374 	int (*query_reparse_point)(const unsigned int xid,
375 				   struct cifs_tcon *tcon,
376 				   struct cifs_sb_info *cifs_sb,
377 				   const char *full_path,
378 				   u32 *tag, struct kvec *rsp,
379 				   int *rsp_buftype);
380 	/* get server index number */
381 	int (*get_srv_inum)(const unsigned int xid, struct cifs_tcon *tcon,
382 			    struct cifs_sb_info *cifs_sb, const char *full_path, u64 *uniqueid,
383 			    struct cifs_open_info_data *data);
384 	/* set size by path */
385 	int (*set_path_size)(const unsigned int, struct cifs_tcon *,
386 			     const char *, __u64, struct cifs_sb_info *, bool,
387 				 struct dentry *);
388 	/* set size by file handle */
389 	int (*set_file_size)(const unsigned int, struct cifs_tcon *,
390 			     struct cifsFileInfo *, __u64, bool);
391 	/* set attributes */
392 	int (*set_file_info)(struct inode *, const char *, FILE_BASIC_INFO *,
393 			     const unsigned int);
394 	int (*set_compression)(const unsigned int, struct cifs_tcon *,
395 			       struct cifsFileInfo *);
396 	/* check if we can send an echo or nor */
397 	bool (*can_echo)(struct TCP_Server_Info *);
398 	/* send echo request */
399 	int (*echo)(struct TCP_Server_Info *);
400 	/* create directory */
401 	int (*posix_mkdir)(const unsigned int xid, struct inode *inode,
402 			umode_t mode, struct cifs_tcon *tcon,
403 			const char *full_path,
404 			struct cifs_sb_info *cifs_sb);
405 	int (*mkdir)(const unsigned int xid, struct inode *inode, umode_t mode,
406 		     struct cifs_tcon *tcon, const char *name,
407 		     struct cifs_sb_info *sb);
408 	/* set info on created directory */
409 	void (*mkdir_setinfo)(struct inode *, const char *,
410 			      struct cifs_sb_info *, struct cifs_tcon *,
411 			      const unsigned int);
412 	/* remove directory */
413 	int (*rmdir)(const unsigned int, struct cifs_tcon *, const char *,
414 		     struct cifs_sb_info *);
415 	/* unlink file */
416 	int (*unlink)(const unsigned int, struct cifs_tcon *, const char *,
417 		      struct cifs_sb_info *, struct dentry *);
418 	/* open, rename and delete file */
419 	int (*rename_pending_delete)(const char *, struct dentry *,
420 				     const unsigned int);
421 	/* send rename request */
422 	int (*rename)(const unsigned int xid,
423 		      struct cifs_tcon *tcon,
424 		      struct dentry *source_dentry,
425 		      const char *from_name, const char *to_name,
426 		      struct cifs_sb_info *cifs_sb);
427 	/* send create hardlink request */
428 	int (*create_hardlink)(const unsigned int xid,
429 			       struct cifs_tcon *tcon,
430 			       struct dentry *source_dentry,
431 			       const char *from_name, const char *to_name,
432 			       struct cifs_sb_info *cifs_sb);
433 	/* query symlink target */
434 	int (*query_symlink)(const unsigned int xid,
435 			     struct cifs_tcon *tcon,
436 			     struct cifs_sb_info *cifs_sb,
437 			     const char *full_path,
438 			     char **target_path);
439 	/* open a file for non-posix mounts */
440 	int (*open)(const unsigned int xid, struct cifs_open_parms *oparms, __u32 *oplock,
441 		    void *buf);
442 	/* set fid protocol-specific info */
443 	void (*set_fid)(struct cifsFileInfo *, struct cifs_fid *, __u32);
444 	/* close a file */
445 	int (*close)(const unsigned int, struct cifs_tcon *,
446 		      struct cifs_fid *);
447 	/* close a file, returning file attributes and timestamps */
448 	int (*close_getattr)(const unsigned int xid, struct cifs_tcon *tcon,
449 		      struct cifsFileInfo *pfile_info);
450 	/* send a flush request to the server */
451 	int (*flush)(const unsigned int, struct cifs_tcon *, struct cifs_fid *);
452 	/* async read from the server */
453 	int (*async_readv)(struct cifs_readdata *);
454 	/* async write to the server */
455 	int (*async_writev)(struct cifs_writedata *,
456 			    void (*release)(struct kref *));
457 	/* sync read from the server */
458 	int (*sync_read)(const unsigned int, struct cifs_fid *,
459 			 struct cifs_io_parms *, unsigned int *, char **,
460 			 int *);
461 	/* sync write to the server */
462 	int (*sync_write)(const unsigned int, struct cifs_fid *,
463 			  struct cifs_io_parms *, unsigned int *, struct kvec *,
464 			  unsigned long);
465 	/* open dir, start readdir */
466 	int (*query_dir_first)(const unsigned int, struct cifs_tcon *,
467 			       const char *, struct cifs_sb_info *,
468 			       struct cifs_fid *, __u16,
469 			       struct cifs_search_info *);
470 	/* continue readdir */
471 	int (*query_dir_next)(const unsigned int, struct cifs_tcon *,
472 			      struct cifs_fid *,
473 			      __u16, struct cifs_search_info *srch_inf);
474 	/* close dir */
475 	int (*close_dir)(const unsigned int, struct cifs_tcon *,
476 			 struct cifs_fid *);
477 	/* calculate a size of SMB message */
478 	unsigned int (*calc_smb_size)(void *buf);
479 	/* check for STATUS_PENDING and process the response if yes */
480 	bool (*is_status_pending)(char *buf, struct TCP_Server_Info *server);
481 	/* check for STATUS_NETWORK_SESSION_EXPIRED */
482 	bool (*is_session_expired)(char *);
483 	/* send oplock break response */
484 	int (*oplock_response)(struct cifs_tcon *tcon, __u64 persistent_fid, __u64 volatile_fid,
485 			__u16 net_fid, struct cifsInodeInfo *cifs_inode);
486 	/* query remote filesystem */
487 	int (*queryfs)(const unsigned int, struct cifs_tcon *,
488 		       struct cifs_sb_info *, struct kstatfs *);
489 	/* send mandatory brlock to the server */
490 	int (*mand_lock)(const unsigned int, struct cifsFileInfo *, __u64,
491 			 __u64, __u32, int, int, bool);
492 	/* unlock range of mandatory locks */
493 	int (*mand_unlock_range)(struct cifsFileInfo *, struct file_lock *,
494 				 const unsigned int);
495 	/* push brlocks from the cache to the server */
496 	int (*push_mand_locks)(struct cifsFileInfo *);
497 	/* get lease key of the inode */
498 	void (*get_lease_key)(struct inode *, struct cifs_fid *);
499 	/* set lease key of the inode */
500 	void (*set_lease_key)(struct inode *, struct cifs_fid *);
501 	/* generate new lease key */
502 	void (*new_lease_key)(struct cifs_fid *);
503 	int (*generate_signingkey)(struct cifs_ses *ses,
504 				   struct TCP_Server_Info *server);
505 	int (*calc_signature)(struct smb_rqst *, struct TCP_Server_Info *,
506 				bool allocate_crypto);
507 	int (*set_integrity)(const unsigned int, struct cifs_tcon *tcon,
508 			     struct cifsFileInfo *src_file);
509 	int (*enum_snapshots)(const unsigned int xid, struct cifs_tcon *tcon,
510 			     struct cifsFileInfo *src_file, void __user *);
511 	int (*notify)(const unsigned int xid, struct file *pfile,
512 			     void __user *pbuf, bool return_changes);
513 	int (*query_mf_symlink)(unsigned int, struct cifs_tcon *,
514 				struct cifs_sb_info *, const unsigned char *,
515 				char *, unsigned int *);
516 	int (*create_mf_symlink)(unsigned int, struct cifs_tcon *,
517 				 struct cifs_sb_info *, const unsigned char *,
518 				 char *, unsigned int *);
519 	/* if we can do cache read operations */
520 	bool (*is_read_op)(__u32);
521 	/* set oplock level for the inode */
522 	void (*set_oplock_level)(struct cifsInodeInfo *, __u32, unsigned int,
523 				 bool *);
524 	/* create lease context buffer for CREATE request */
525 	char * (*create_lease_buf)(u8 *lease_key, u8 oplock);
526 	/* parse lease context buffer and return oplock/epoch info */
527 	__u8 (*parse_lease_buf)(void *buf, unsigned int *epoch, char *lkey);
528 	ssize_t (*copychunk_range)(const unsigned int,
529 			struct cifsFileInfo *src_file,
530 			struct cifsFileInfo *target_file,
531 			u64 src_off, u64 len, u64 dest_off);
532 	int (*duplicate_extents)(const unsigned int, struct cifsFileInfo *src,
533 			struct cifsFileInfo *target_file, u64 src_off, u64 len,
534 			u64 dest_off);
535 	int (*validate_negotiate)(const unsigned int, struct cifs_tcon *);
536 	ssize_t (*query_all_EAs)(const unsigned int, struct cifs_tcon *,
537 			const unsigned char *, const unsigned char *, char *,
538 			size_t, struct cifs_sb_info *);
539 	int (*set_EA)(const unsigned int, struct cifs_tcon *, const char *,
540 			const char *, const void *, const __u16,
541 			const struct nls_table *, struct cifs_sb_info *);
542 	struct cifs_ntsd * (*get_acl)(struct cifs_sb_info *, struct inode *,
543 			const char *, u32 *, u32);
544 	struct cifs_ntsd * (*get_acl_by_fid)(struct cifs_sb_info *,
545 			const struct cifs_fid *, u32 *, u32);
546 	int (*set_acl)(struct cifs_ntsd *, __u32, struct inode *, const char *,
547 			int);
548 	/* writepages retry size */
549 	unsigned int (*wp_retry_size)(struct inode *);
550 	/* get mtu credits */
551 	int (*wait_mtu_credits)(struct TCP_Server_Info *, unsigned int,
552 				unsigned int *, struct cifs_credits *);
553 	/* adjust previously taken mtu credits to request size */
554 	int (*adjust_credits)(struct TCP_Server_Info *server,
555 			      struct cifs_credits *credits,
556 			      const unsigned int payload_size);
557 	/* check if we need to issue closedir */
558 	bool (*dir_needs_close)(struct cifsFileInfo *);
559 	long (*fallocate)(struct file *, struct cifs_tcon *, int, loff_t,
560 			  loff_t);
561 	/* init transform request - used for encryption for now */
562 	int (*init_transform_rq)(struct TCP_Server_Info *, int num_rqst,
563 				 struct smb_rqst *, struct smb_rqst *);
564 	int (*is_transform_hdr)(void *buf);
565 	int (*receive_transform)(struct TCP_Server_Info *,
566 				 struct mid_q_entry **, char **, int *);
567 	enum securityEnum (*select_sectype)(struct TCP_Server_Info *,
568 			    enum securityEnum);
569 	int (*next_header)(struct TCP_Server_Info *server, char *buf,
570 			   unsigned int *noff);
571 	/* ioctl passthrough for query_info */
572 	int (*ioctl_query_info)(const unsigned int xid,
573 				struct cifs_tcon *tcon,
574 				struct cifs_sb_info *cifs_sb,
575 				__le16 *path, int is_dir,
576 				unsigned long p);
577 	/* make unix special files (block, char, fifo, socket) */
578 	int (*make_node)(unsigned int xid,
579 			 struct inode *inode,
580 			 struct dentry *dentry,
581 			 struct cifs_tcon *tcon,
582 			 const char *full_path,
583 			 umode_t mode,
584 			 dev_t device_number);
585 	/* version specific fiemap implementation */
586 	int (*fiemap)(struct cifs_tcon *tcon, struct cifsFileInfo *,
587 		      struct fiemap_extent_info *, u64, u64);
588 	/* version specific llseek implementation */
589 	loff_t (*llseek)(struct file *, struct cifs_tcon *, loff_t, int);
590 	/* Check for STATUS_IO_TIMEOUT */
591 	bool (*is_status_io_timeout)(char *buf);
592 	/* Check for STATUS_NETWORK_NAME_DELETED */
593 	bool (*is_network_name_deleted)(char *buf, struct TCP_Server_Info *srv);
594 	int (*parse_reparse_point)(struct cifs_sb_info *cifs_sb,
595 				   struct kvec *rsp_iov,
596 				   struct cifs_open_info_data *data);
597 	int (*create_reparse_symlink)(const unsigned int xid,
598 				      struct inode *inode,
599 				      struct dentry *dentry,
600 				      struct cifs_tcon *tcon,
601 				      const char *full_path,
602 				      const char *symname);
603 };
604 
605 struct smb_version_values {
606 	char		*version_string;
607 	__u16		protocol_id;
608 	__u32		req_capabilities;
609 	__u32		large_lock_type;
610 	__u32		exclusive_lock_type;
611 	__u32		shared_lock_type;
612 	__u32		unlock_lock_type;
613 	size_t		header_preamble_size;
614 	size_t		header_size;
615 	size_t		max_header_size;
616 	size_t		read_rsp_size;
617 	__le16		lock_cmd;
618 	unsigned int	cap_unix;
619 	unsigned int	cap_nt_find;
620 	unsigned int	cap_large_files;
621 	__u16		signing_enabled;
622 	__u16		signing_required;
623 	size_t		create_lease_size;
624 };
625 
626 #define HEADER_SIZE(server) (server->vals->header_size)
627 #define MAX_HEADER_SIZE(server) (server->vals->max_header_size)
628 #define HEADER_PREAMBLE_SIZE(server) (server->vals->header_preamble_size)
629 #define MID_HEADER_SIZE(server) (HEADER_SIZE(server) - 1 - HEADER_PREAMBLE_SIZE(server))
630 
631 /**
632  * CIFS superblock mount flags (mnt_cifs_flags) to consider when
633  * trying to reuse existing superblock for a new mount
634  */
635 #define CIFS_MOUNT_MASK (CIFS_MOUNT_NO_PERM | CIFS_MOUNT_SET_UID | \
636 			 CIFS_MOUNT_SERVER_INUM | CIFS_MOUNT_DIRECT_IO | \
637 			 CIFS_MOUNT_NO_XATTR | CIFS_MOUNT_MAP_SPECIAL_CHR | \
638 			 CIFS_MOUNT_MAP_SFM_CHR | \
639 			 CIFS_MOUNT_UNX_EMUL | CIFS_MOUNT_NO_BRL | \
640 			 CIFS_MOUNT_CIFS_ACL | CIFS_MOUNT_OVERR_UID | \
641 			 CIFS_MOUNT_OVERR_GID | CIFS_MOUNT_DYNPERM | \
642 			 CIFS_MOUNT_NOPOSIXBRL | CIFS_MOUNT_NOSSYNC | \
643 			 CIFS_MOUNT_FSCACHE | CIFS_MOUNT_MF_SYMLINKS | \
644 			 CIFS_MOUNT_MULTIUSER | CIFS_MOUNT_STRICT_IO | \
645 			 CIFS_MOUNT_CIFS_BACKUPUID | CIFS_MOUNT_CIFS_BACKUPGID | \
646 			 CIFS_MOUNT_UID_FROM_ACL | CIFS_MOUNT_NO_HANDLE_CACHE | \
647 			 CIFS_MOUNT_NO_DFS | CIFS_MOUNT_MODE_FROM_SID | \
648 			 CIFS_MOUNT_RO_CACHE | CIFS_MOUNT_RW_CACHE)
649 
650 /**
651  * Generic VFS superblock mount flags (s_flags) to consider when
652  * trying to reuse existing superblock for a new mount
653  */
654 #define CIFS_MS_MASK (SB_RDONLY | SB_MANDLOCK | SB_NOEXEC | SB_NOSUID | \
655 		      SB_NODEV | SB_SYNCHRONOUS)
656 
657 struct cifs_mnt_data {
658 	struct cifs_sb_info *cifs_sb;
659 	struct smb3_fs_context *ctx;
660 	int flags;
661 };
662 
663 static inline unsigned int
664 get_rfc1002_length(void *buf)
665 {
666 	return be32_to_cpu(*((__be32 *)buf)) & 0xffffff;
667 }
668 
669 static inline void
670 inc_rfc1001_len(void *buf, int count)
671 {
672 	be32_add_cpu((__be32 *)buf, count);
673 }
674 
675 struct TCP_Server_Info {
676 	struct list_head tcp_ses_list;
677 	struct list_head smb_ses_list;
678 	spinlock_t srv_lock;  /* protect anything here that is not protected */
679 	__u64 conn_id; /* connection identifier (useful for debugging) */
680 	int srv_count; /* reference counter */
681 	/* 15 character server name + 0x20 16th byte indicating type = srv */
682 	char server_RFC1001_name[RFC1001_NAME_LEN_WITH_NULL];
683 	struct smb_version_operations	*ops;
684 	struct smb_version_values	*vals;
685 	/* updates to tcpStatus protected by cifs_tcp_ses_lock */
686 	enum statusEnum tcpStatus; /* what we think the status is */
687 	char *hostname; /* hostname portion of UNC string */
688 	struct socket *ssocket;
689 	struct sockaddr_storage dstaddr;
690 	struct sockaddr_storage srcaddr; /* locally bind to this IP */
691 #ifdef CONFIG_NET_NS
692 	struct net *net;
693 #endif
694 	wait_queue_head_t response_q;
695 	wait_queue_head_t request_q; /* if more than maxmpx to srvr must block*/
696 	spinlock_t mid_lock;  /* protect mid queue and it's entries */
697 	struct list_head pending_mid_q;
698 	bool noblocksnd;		/* use blocking sendmsg */
699 	bool noautotune;		/* do not autotune send buf sizes */
700 	bool nosharesock;
701 	bool tcp_nodelay;
702 	bool terminate;
703 	unsigned int credits;  /* send no more requests at once */
704 	unsigned int max_credits; /* can override large 32000 default at mnt */
705 	unsigned int in_flight;  /* number of requests on the wire to server */
706 	unsigned int max_in_flight; /* max number of requests that were on wire */
707 	spinlock_t req_lock;  /* protect the two values above */
708 	struct mutex _srv_mutex;
709 	unsigned int nofs_flag;
710 	struct task_struct *tsk;
711 	char server_GUID[16];
712 	__u16 sec_mode;
713 	bool sign; /* is signing enabled on this connection? */
714 	bool ignore_signature:1; /* skip validation of signatures in SMB2/3 rsp */
715 	bool session_estab; /* mark when very first sess is established */
716 	int echo_credits;  /* echo reserved slots */
717 	int oplock_credits;  /* oplock break reserved slots */
718 	bool echoes:1; /* enable echoes */
719 	__u8 client_guid[SMB2_CLIENT_GUID_SIZE]; /* Client GUID */
720 	u16 dialect; /* dialect index that server chose */
721 	bool oplocks:1; /* enable oplocks */
722 	unsigned int maxReq;	/* Clients should submit no more */
723 	/* than maxReq distinct unanswered SMBs to the server when using  */
724 	/* multiplexed reads or writes (for SMB1/CIFS only, not SMB2/SMB3) */
725 	unsigned int maxBuf;	/* maxBuf specifies the maximum */
726 	/* message size the server can send or receive for non-raw SMBs */
727 	/* maxBuf is returned by SMB NegotiateProtocol so maxBuf is only 0 */
728 	/* when socket is setup (and during reconnect) before NegProt sent */
729 	unsigned int max_rw;	/* maxRw specifies the maximum */
730 	/* message size the server can send or receive for */
731 	/* SMB_COM_WRITE_RAW or SMB_COM_READ_RAW. */
732 	unsigned int capabilities; /* selective disabling of caps by smb sess */
733 	int timeAdj;  /* Adjust for difference in server time zone in sec */
734 	__u64 CurrentMid;         /* multiplex id - rotating counter, protected by GlobalMid_Lock */
735 	char cryptkey[CIFS_CRYPTO_KEY_SIZE]; /* used by ntlm, ntlmv2 etc */
736 	/* 16th byte of RFC1001 workstation name is always null */
737 	char workstation_RFC1001_name[RFC1001_NAME_LEN_WITH_NULL];
738 	__u32 sequence_number; /* for signing, protected by srv_mutex */
739 	__u32 reconnect_instance; /* incremented on each reconnect */
740 	struct session_key session_key;
741 	unsigned long lstrp; /* when we got last response from this server */
742 	struct cifs_secmech secmech; /* crypto sec mech functs, descriptors */
743 #define	CIFS_NEGFLAVOR_UNENCAP	1	/* wct == 17, but no ext_sec */
744 #define	CIFS_NEGFLAVOR_EXTENDED	2	/* wct == 17, ext_sec bit set */
745 	char	negflavor;	/* NEGOTIATE response flavor */
746 	/* extended security flavors that server supports */
747 	bool	sec_ntlmssp;		/* supports NTLMSSP */
748 	bool	sec_kerberosu2u;	/* supports U2U Kerberos */
749 	bool	sec_kerberos;		/* supports plain Kerberos */
750 	bool	sec_mskerberos;		/* supports legacy MS Kerberos */
751 	bool	large_buf;		/* is current buffer large? */
752 	/* use SMBD connection instead of socket */
753 	bool	rdma;
754 	/* point to the SMBD connection if RDMA is used instead of socket */
755 	struct smbd_connection *smbd_conn;
756 	struct delayed_work	echo; /* echo ping workqueue job */
757 	char	*smallbuf;	/* pointer to current "small" buffer */
758 	char	*bigbuf;	/* pointer to current "big" buffer */
759 	/* Total size of this PDU. Only valid from cifs_demultiplex_thread */
760 	unsigned int pdu_size;
761 	unsigned int total_read; /* total amount of data read in this pass */
762 	atomic_t in_send; /* requests trying to send */
763 	atomic_t num_waiters;   /* blocked waiting to get in sendrecv */
764 #ifdef CONFIG_CIFS_STATS2
765 	atomic_t num_cmds[NUMBER_OF_SMB2_COMMANDS]; /* total requests by cmd */
766 	atomic_t smb2slowcmd[NUMBER_OF_SMB2_COMMANDS]; /* count resps > 1 sec */
767 	__u64 time_per_cmd[NUMBER_OF_SMB2_COMMANDS]; /* total time per cmd */
768 	__u32 slowest_cmd[NUMBER_OF_SMB2_COMMANDS];
769 	__u32 fastest_cmd[NUMBER_OF_SMB2_COMMANDS];
770 #endif /* STATS2 */
771 	unsigned int	max_read;
772 	unsigned int	max_write;
773 	unsigned int	min_offload;
774 	unsigned int	retrans;
775 	struct {
776 		bool requested; /* "compress" mount option set*/
777 		bool enabled; /* actually negotiated with server */
778 		__le16 alg; /* preferred alg negotiated with server */
779 	} compression;
780 	__u16	signing_algorithm;
781 	__le16	cipher_type;
782 	 /* save initital negprot hash */
783 	__u8	preauth_sha_hash[SMB2_PREAUTH_HASH_SIZE];
784 	bool	signing_negotiated; /* true if valid signing context rcvd from server */
785 	bool	posix_ext_supported;
786 	struct delayed_work reconnect; /* reconnect workqueue job */
787 	struct mutex reconnect_mutex; /* prevent simultaneous reconnects */
788 	unsigned long echo_interval;
789 
790 	/*
791 	 * Number of targets available for reconnect. The more targets
792 	 * the more tasks have to wait to let the demultiplex thread
793 	 * reconnect.
794 	 */
795 	int nr_targets;
796 	bool noblockcnt; /* use non-blocking connect() */
797 
798 	/*
799 	 * If this is a session channel,
800 	 * primary_server holds the ref-counted
801 	 * pointer to primary channel connection for the session.
802 	 */
803 #define SERVER_IS_CHAN(server)	(!!(server)->primary_server)
804 	struct TCP_Server_Info *primary_server;
805 	__u16 channel_sequence_num;  /* incremented on primary channel on each chan reconnect */
806 
807 #ifdef CONFIG_CIFS_SWN_UPCALL
808 	bool use_swn_dstaddr;
809 	struct sockaddr_storage swn_dstaddr;
810 #endif
811 	struct mutex refpath_lock; /* protects leaf_fullpath */
812 	/*
813 	 * leaf_fullpath: Canonical DFS referral path related to this
814 	 *                connection.
815 	 *                It is used in DFS cache refresher, reconnect and may
816 	 *                change due to nested DFS links.
817 	 *
818 	 * Protected by @refpath_lock and @srv_lock.  The @refpath_lock is
819 	 * mostly used for not requiring a copy of @leaf_fullpath when getting
820 	 * cached or new DFS referrals (which might also sleep during I/O).
821 	 * While @srv_lock is held for making string and NULL comparions against
822 	 * both fields as in mount(2) and cache refresh.
823 	 *
824 	 * format: \\HOST\SHARE[\OPTIONAL PATH]
825 	 */
826 	char *leaf_fullpath;
827 };
828 
829 static inline bool is_smb1(struct TCP_Server_Info *server)
830 {
831 	return HEADER_PREAMBLE_SIZE(server) != 0;
832 }
833 
834 static inline void cifs_server_lock(struct TCP_Server_Info *server)
835 {
836 	unsigned int nofs_flag = memalloc_nofs_save();
837 
838 	mutex_lock(&server->_srv_mutex);
839 	server->nofs_flag = nofs_flag;
840 }
841 
842 static inline void cifs_server_unlock(struct TCP_Server_Info *server)
843 {
844 	unsigned int nofs_flag = server->nofs_flag;
845 
846 	mutex_unlock(&server->_srv_mutex);
847 	memalloc_nofs_restore(nofs_flag);
848 }
849 
850 struct cifs_credits {
851 	unsigned int value;
852 	unsigned int instance;
853 };
854 
855 static inline unsigned int
856 in_flight(struct TCP_Server_Info *server)
857 {
858 	unsigned int num;
859 
860 	spin_lock(&server->req_lock);
861 	num = server->in_flight;
862 	spin_unlock(&server->req_lock);
863 	return num;
864 }
865 
866 static inline bool
867 has_credits(struct TCP_Server_Info *server, int *credits, int num_credits)
868 {
869 	int num;
870 
871 	spin_lock(&server->req_lock);
872 	num = *credits;
873 	spin_unlock(&server->req_lock);
874 	return num >= num_credits;
875 }
876 
877 static inline void
878 add_credits(struct TCP_Server_Info *server, const struct cifs_credits *credits,
879 	    const int optype)
880 {
881 	server->ops->add_credits(server, credits, optype);
882 }
883 
884 static inline void
885 add_credits_and_wake_if(struct TCP_Server_Info *server,
886 			const struct cifs_credits *credits, const int optype)
887 {
888 	if (credits->value) {
889 		server->ops->add_credits(server, credits, optype);
890 		wake_up(&server->request_q);
891 	}
892 }
893 
894 static inline void
895 set_credits(struct TCP_Server_Info *server, const int val)
896 {
897 	server->ops->set_credits(server, val);
898 }
899 
900 static inline int
901 adjust_credits(struct TCP_Server_Info *server, struct cifs_credits *credits,
902 	       const unsigned int payload_size)
903 {
904 	return server->ops->adjust_credits ?
905 		server->ops->adjust_credits(server, credits, payload_size) : 0;
906 }
907 
908 static inline __le64
909 get_next_mid64(struct TCP_Server_Info *server)
910 {
911 	return cpu_to_le64(server->ops->get_next_mid(server));
912 }
913 
914 static inline __le16
915 get_next_mid(struct TCP_Server_Info *server)
916 {
917 	__u16 mid = server->ops->get_next_mid(server);
918 	/*
919 	 * The value in the SMB header should be little endian for easy
920 	 * on-the-wire decoding.
921 	 */
922 	return cpu_to_le16(mid);
923 }
924 
925 static inline void
926 revert_current_mid(struct TCP_Server_Info *server, const unsigned int val)
927 {
928 	if (server->ops->revert_current_mid)
929 		server->ops->revert_current_mid(server, val);
930 }
931 
932 static inline void
933 revert_current_mid_from_hdr(struct TCP_Server_Info *server,
934 			    const struct smb2_hdr *shdr)
935 {
936 	unsigned int num = le16_to_cpu(shdr->CreditCharge);
937 
938 	return revert_current_mid(server, num > 0 ? num : 1);
939 }
940 
941 static inline __u16
942 get_mid(const struct smb_hdr *smb)
943 {
944 	return le16_to_cpu(smb->Mid);
945 }
946 
947 static inline bool
948 compare_mid(__u16 mid, const struct smb_hdr *smb)
949 {
950 	return mid == le16_to_cpu(smb->Mid);
951 }
952 
953 /*
954  * When the server supports very large reads and writes via POSIX extensions,
955  * we can allow up to 2^24-1, minus the size of a READ/WRITE_AND_X header, not
956  * including the RFC1001 length.
957  *
958  * Note that this might make for "interesting" allocation problems during
959  * writeback however as we have to allocate an array of pointers for the
960  * pages. A 16M write means ~32kb page array with PAGE_SIZE == 4096.
961  *
962  * For reads, there is a similar problem as we need to allocate an array
963  * of kvecs to handle the receive, though that should only need to be done
964  * once.
965  */
966 #define CIFS_MAX_WSIZE ((1<<24) - 1 - sizeof(WRITE_REQ) + 4)
967 #define CIFS_MAX_RSIZE ((1<<24) - sizeof(READ_RSP) + 4)
968 
969 /*
970  * When the server doesn't allow large posix writes, only allow a rsize/wsize
971  * of 2^17-1 minus the size of the call header. That allows for a read or
972  * write up to the maximum size described by RFC1002.
973  */
974 #define CIFS_MAX_RFC1002_WSIZE ((1<<17) - 1 - sizeof(WRITE_REQ) + 4)
975 #define CIFS_MAX_RFC1002_RSIZE ((1<<17) - 1 - sizeof(READ_RSP) + 4)
976 
977 #define CIFS_DEFAULT_IOSIZE (1024 * 1024)
978 
979 /*
980  * Windows only supports a max of 60kb reads and 65535 byte writes. Default to
981  * those values when posix extensions aren't in force. In actuality here, we
982  * use 65536 to allow for a write that is a multiple of 4k. Most servers seem
983  * to be ok with the extra byte even though Windows doesn't send writes that
984  * are that large.
985  *
986  * Citation:
987  *
988  * https://blogs.msdn.com/b/openspecification/archive/2009/04/10/smb-maximum-transmit-buffer-size-and-performance-tuning.aspx
989  */
990 #define CIFS_DEFAULT_NON_POSIX_RSIZE (60 * 1024)
991 #define CIFS_DEFAULT_NON_POSIX_WSIZE (65536)
992 
993 /*
994  * Macros to allow the TCP_Server_Info->net field and related code to drop out
995  * when CONFIG_NET_NS isn't set.
996  */
997 
998 #ifdef CONFIG_NET_NS
999 
1000 static inline struct net *cifs_net_ns(struct TCP_Server_Info *srv)
1001 {
1002 	return srv->net;
1003 }
1004 
1005 static inline void cifs_set_net_ns(struct TCP_Server_Info *srv, struct net *net)
1006 {
1007 	srv->net = net;
1008 }
1009 
1010 #else
1011 
1012 static inline struct net *cifs_net_ns(struct TCP_Server_Info *srv)
1013 {
1014 	return &init_net;
1015 }
1016 
1017 static inline void cifs_set_net_ns(struct TCP_Server_Info *srv, struct net *net)
1018 {
1019 }
1020 
1021 #endif
1022 
1023 struct cifs_server_iface {
1024 	struct list_head iface_head;
1025 	struct kref refcount;
1026 	size_t speed;
1027 	size_t weight_fulfilled;
1028 	unsigned int num_channels;
1029 	unsigned int rdma_capable : 1;
1030 	unsigned int rss_capable : 1;
1031 	unsigned int is_active : 1; /* unset if non existent */
1032 	struct sockaddr_storage sockaddr;
1033 };
1034 
1035 /* release iface when last ref is dropped */
1036 static inline void
1037 release_iface(struct kref *ref)
1038 {
1039 	struct cifs_server_iface *iface = container_of(ref,
1040 						       struct cifs_server_iface,
1041 						       refcount);
1042 	kfree(iface);
1043 }
1044 
1045 struct cifs_chan {
1046 	unsigned int in_reconnect : 1; /* if session setup in progress for this channel */
1047 	struct TCP_Server_Info *server;
1048 	struct cifs_server_iface *iface; /* interface in use */
1049 	__u8 signkey[SMB3_SIGN_KEY_SIZE];
1050 };
1051 
1052 #define CIFS_SES_FLAG_SCALE_CHANNELS (0x1)
1053 
1054 /*
1055  * Session structure.  One of these for each uid session with a particular host
1056  */
1057 struct cifs_ses {
1058 	struct list_head smb_ses_list;
1059 	struct list_head rlist; /* reconnect list */
1060 	struct list_head tcon_list;
1061 	struct cifs_tcon *tcon_ipc;
1062 	spinlock_t ses_lock;  /* protect anything here that is not protected */
1063 	struct mutex session_mutex;
1064 	struct TCP_Server_Info *server;	/* pointer to server info */
1065 	int ses_count;		/* reference counter */
1066 	enum ses_status_enum ses_status;  /* updates protected by cifs_tcp_ses_lock */
1067 	unsigned int overrideSecFlg; /* if non-zero override global sec flags */
1068 	char *serverOS;		/* name of operating system underlying server */
1069 	char *serverNOS;	/* name of network operating system of server */
1070 	char *serverDomain;	/* security realm of server */
1071 	__u64 Suid;		/* remote smb uid  */
1072 	kuid_t linux_uid;	/* overriding owner of files on the mount */
1073 	kuid_t cred_uid;	/* owner of credentials */
1074 	unsigned int capabilities;
1075 	char ip_addr[INET6_ADDRSTRLEN + 1]; /* Max ipv6 (or v4) addr string len */
1076 	char *user_name;	/* must not be null except during init of sess
1077 				   and after mount option parsing we fill it */
1078 	char *domainName;
1079 	char *password;
1080 	char *password2; /* When key rotation used, new password may be set before it expires */
1081 	char workstation_name[CIFS_MAX_WORKSTATION_LEN];
1082 	struct session_key auth_key;
1083 	struct ntlmssp_auth *ntlmssp; /* ciphertext, flags, server challenge */
1084 	enum securityEnum sectype; /* what security flavor was specified? */
1085 	bool sign;		/* is signing required? */
1086 	bool domainAuto:1;
1087 	bool expired_pwd;  /* track if access denied or expired pwd so can know if need to update */
1088 	unsigned int flags;
1089 	__u16 session_flags;
1090 	__u8 smb3signingkey[SMB3_SIGN_KEY_SIZE];
1091 	__u8 smb3encryptionkey[SMB3_ENC_DEC_KEY_SIZE];
1092 	__u8 smb3decryptionkey[SMB3_ENC_DEC_KEY_SIZE];
1093 	__u8 preauth_sha_hash[SMB2_PREAUTH_HASH_SIZE];
1094 
1095 	/*
1096 	 * Network interfaces available on the server this session is
1097 	 * connected to.
1098 	 *
1099 	 * Other channels can be opened by connecting and binding this
1100 	 * session to interfaces from this list.
1101 	 *
1102 	 * iface_lock should be taken when accessing any of these fields
1103 	 */
1104 	spinlock_t iface_lock;
1105 	/* ========= begin: protected by iface_lock ======== */
1106 	struct list_head iface_list;
1107 	size_t iface_count;
1108 	unsigned long iface_last_update; /* jiffies */
1109 	/* ========= end: protected by iface_lock ======== */
1110 
1111 	spinlock_t chan_lock;
1112 	/* ========= begin: protected by chan_lock ======== */
1113 #define CIFS_MAX_CHANNELS 16
1114 #define CIFS_INVAL_CHAN_INDEX (-1)
1115 #define CIFS_ALL_CHANNELS_SET(ses)	\
1116 	((1UL << (ses)->chan_count) - 1)
1117 #define CIFS_ALL_CHANS_GOOD(ses)		\
1118 	(!(ses)->chans_need_reconnect)
1119 #define CIFS_ALL_CHANS_NEED_RECONNECT(ses)	\
1120 	((ses)->chans_need_reconnect == CIFS_ALL_CHANNELS_SET(ses))
1121 #define CIFS_SET_ALL_CHANS_NEED_RECONNECT(ses)	\
1122 	((ses)->chans_need_reconnect = CIFS_ALL_CHANNELS_SET(ses))
1123 #define CIFS_CHAN_NEEDS_RECONNECT(ses, index)	\
1124 	test_bit((index), &(ses)->chans_need_reconnect)
1125 #define CIFS_CHAN_IN_RECONNECT(ses, index)	\
1126 	((ses)->chans[(index)].in_reconnect)
1127 
1128 	struct cifs_chan chans[CIFS_MAX_CHANNELS];
1129 	size_t chan_count;
1130 	size_t chan_max;
1131 	atomic_t chan_seq; /* round robin state */
1132 
1133 	/*
1134 	 * chans_need_reconnect is a bitmap indicating which of the channels
1135 	 * under this smb session needs to be reconnected.
1136 	 * If not multichannel session, only one bit will be used.
1137 	 *
1138 	 * We will ask for sess and tcon reconnection only if all the
1139 	 * channels are marked for needing reconnection. This will
1140 	 * enable the sessions on top to continue to live till any
1141 	 * of the channels below are active.
1142 	 */
1143 	unsigned long chans_need_reconnect;
1144 	/* ========= end: protected by chan_lock ======== */
1145 	struct cifs_ses *dfs_root_ses;
1146 	struct nls_table *local_nls;
1147 };
1148 
1149 static inline bool
1150 cap_unix(struct cifs_ses *ses)
1151 {
1152 	return ses->server->vals->cap_unix & ses->capabilities;
1153 }
1154 
1155 /*
1156  * common struct for holding inode info when searching for or updating an
1157  * inode with new info
1158  */
1159 
1160 #define CIFS_FATTR_JUNCTION		0x1
1161 #define CIFS_FATTR_DELETE_PENDING	0x2
1162 #define CIFS_FATTR_NEED_REVAL		0x4
1163 #define CIFS_FATTR_INO_COLLISION	0x8
1164 #define CIFS_FATTR_UNKNOWN_NLINK	0x10
1165 #define CIFS_FATTR_FAKE_ROOT_INO	0x20
1166 
1167 struct cifs_fattr {
1168 	u32		cf_flags;
1169 	u32		cf_cifsattrs;
1170 	u64		cf_uniqueid;
1171 	u64		cf_eof;
1172 	u64		cf_bytes;
1173 	u64		cf_createtime;
1174 	kuid_t		cf_uid;
1175 	kgid_t		cf_gid;
1176 	umode_t		cf_mode;
1177 	dev_t		cf_rdev;
1178 	unsigned int	cf_nlink;
1179 	unsigned int	cf_dtype;
1180 	struct timespec64 cf_atime;
1181 	struct timespec64 cf_mtime;
1182 	struct timespec64 cf_ctime;
1183 	u32             cf_cifstag;
1184 	char            *cf_symlink_target;
1185 };
1186 
1187 /*
1188  * there is one of these for each connection to a resource on a particular
1189  * session
1190  */
1191 struct cifs_tcon {
1192 	struct list_head tcon_list;
1193 	int debug_id;		/* Debugging for tracing */
1194 	int tc_count;
1195 	struct list_head rlist; /* reconnect list */
1196 	spinlock_t tc_lock;  /* protect anything here that is not protected */
1197 	atomic_t num_local_opens;  /* num of all opens including disconnected */
1198 	atomic_t num_remote_opens; /* num of all network opens on server */
1199 	struct list_head openFileList;
1200 	spinlock_t open_file_lock; /* protects list above */
1201 	struct cifs_ses *ses;	/* pointer to session associated with */
1202 	char tree_name[MAX_TREE_SIZE + 1]; /* UNC name of resource in ASCII */
1203 	char *nativeFileSystem;
1204 	char *password;		/* for share-level security */
1205 	__u32 tid;		/* The 4 byte tree id */
1206 	__u16 Flags;		/* optional support bits */
1207 	enum tid_status_enum status;
1208 	atomic_t num_smbs_sent;
1209 	union {
1210 		struct {
1211 			atomic_t num_writes;
1212 			atomic_t num_reads;
1213 			atomic_t num_flushes;
1214 			atomic_t num_oplock_brks;
1215 			atomic_t num_opens;
1216 			atomic_t num_closes;
1217 			atomic_t num_deletes;
1218 			atomic_t num_mkdirs;
1219 			atomic_t num_posixopens;
1220 			atomic_t num_posixmkdirs;
1221 			atomic_t num_rmdirs;
1222 			atomic_t num_renames;
1223 			atomic_t num_t2renames;
1224 			atomic_t num_ffirst;
1225 			atomic_t num_fnext;
1226 			atomic_t num_fclose;
1227 			atomic_t num_hardlinks;
1228 			atomic_t num_symlinks;
1229 			atomic_t num_locks;
1230 			atomic_t num_acl_get;
1231 			atomic_t num_acl_set;
1232 		} cifs_stats;
1233 		struct {
1234 			atomic_t smb2_com_sent[NUMBER_OF_SMB2_COMMANDS];
1235 			atomic_t smb2_com_failed[NUMBER_OF_SMB2_COMMANDS];
1236 		} smb2_stats;
1237 	} stats;
1238 	__u64    bytes_read;
1239 	__u64    bytes_written;
1240 	spinlock_t stat_lock;  /* protects the two fields above */
1241 	time64_t stats_from_time;
1242 	FILE_SYSTEM_DEVICE_INFO fsDevInfo;
1243 	FILE_SYSTEM_ATTRIBUTE_INFO fsAttrInfo; /* ok if fs name truncated */
1244 	FILE_SYSTEM_UNIX_INFO fsUnixInfo;
1245 	bool ipc:1;   /* set if connection to IPC$ share (always also pipe) */
1246 	bool pipe:1;  /* set if connection to pipe share */
1247 	bool print:1; /* set if connection to printer share */
1248 	bool retry:1;
1249 	bool nocase:1;
1250 	bool nohandlecache:1; /* if strange server resource prob can turn off */
1251 	bool nodelete:1;
1252 	bool seal:1;      /* transport encryption for this mounted share */
1253 	bool unix_ext:1;  /* if false disable Linux extensions to CIFS protocol
1254 				for this mount even if server would support */
1255 	bool posix_extensions; /* if true SMB3.11 posix extensions enabled */
1256 	bool local_lease:1; /* check leases (only) on local system not remote */
1257 	bool broken_posix_open; /* e.g. Samba server versions < 3.3.2, 3.2.9 */
1258 	bool broken_sparse_sup; /* if server or share does not support sparse */
1259 	bool need_reconnect:1; /* connection reset, tid now invalid */
1260 	bool need_reopen_files:1; /* need to reopen tcon file handles */
1261 	bool use_resilient:1; /* use resilient instead of durable handles */
1262 	bool use_persistent:1; /* use persistent instead of durable handles */
1263 	bool no_lease:1;    /* Do not request leases on files or directories */
1264 	bool use_witness:1; /* use witness protocol */
1265 	__le32 capabilities;
1266 	__u32 share_flags;
1267 	__u32 maximal_access;
1268 	__u32 vol_serial_number;
1269 	__le64 vol_create_time;
1270 	__u64 snapshot_time; /* for timewarp tokens - timestamp of snapshot */
1271 	__u32 handle_timeout; /* persistent and durable handle timeout in ms */
1272 	__u32 ss_flags;		/* sector size flags */
1273 	__u32 perf_sector_size; /* best sector size for perf */
1274 	__u32 max_chunks;
1275 	__u32 max_bytes_chunk;
1276 	__u32 max_bytes_copy;
1277 	__u32 max_cached_dirs;
1278 #ifdef CONFIG_CIFS_FSCACHE
1279 	u64 resource_id;		/* server resource id */
1280 	bool fscache_acquired;		/* T if we've tried acquiring a cookie */
1281 	struct fscache_volume *fscache;	/* cookie for share */
1282 	struct mutex fscache_lock;	/* Prevent regetting a cookie */
1283 #endif
1284 	struct list_head pending_opens;	/* list of incomplete opens */
1285 	struct cached_fids *cfids;
1286 	/* BB add field for back pointer to sb struct(s)? */
1287 #ifdef CONFIG_CIFS_DFS_UPCALL
1288 	struct delayed_work dfs_cache_work;
1289 #endif
1290 	struct delayed_work	query_interfaces; /* query interfaces workqueue job */
1291 	char *origin_fullpath; /* canonical copy of smb3_fs_context::source */
1292 };
1293 
1294 /*
1295  * This is a refcounted and timestamped container for a tcon pointer. The
1296  * container holds a tcon reference. It is considered safe to free one of
1297  * these when the tl_count goes to 0. The tl_time is the time of the last
1298  * "get" on the container.
1299  */
1300 struct tcon_link {
1301 	struct rb_node		tl_rbnode;
1302 	kuid_t			tl_uid;
1303 	unsigned long		tl_flags;
1304 #define TCON_LINK_MASTER	0
1305 #define TCON_LINK_PENDING	1
1306 #define TCON_LINK_IN_TREE	2
1307 	unsigned long		tl_time;
1308 	atomic_t		tl_count;
1309 	struct cifs_tcon	*tl_tcon;
1310 };
1311 
1312 extern struct tcon_link *cifs_sb_tlink(struct cifs_sb_info *cifs_sb);
1313 extern void smb3_free_compound_rqst(int num_rqst, struct smb_rqst *rqst);
1314 
1315 static inline struct cifs_tcon *
1316 tlink_tcon(struct tcon_link *tlink)
1317 {
1318 	return tlink->tl_tcon;
1319 }
1320 
1321 static inline struct tcon_link *
1322 cifs_sb_master_tlink(struct cifs_sb_info *cifs_sb)
1323 {
1324 	return cifs_sb->master_tlink;
1325 }
1326 
1327 extern void cifs_put_tlink(struct tcon_link *tlink);
1328 
1329 static inline struct tcon_link *
1330 cifs_get_tlink(struct tcon_link *tlink)
1331 {
1332 	if (tlink && !IS_ERR(tlink))
1333 		atomic_inc(&tlink->tl_count);
1334 	return tlink;
1335 }
1336 
1337 /* This function is always expected to succeed */
1338 extern struct cifs_tcon *cifs_sb_master_tcon(struct cifs_sb_info *cifs_sb);
1339 
1340 #define CIFS_OPLOCK_NO_CHANGE 0xfe
1341 
1342 struct cifs_pending_open {
1343 	struct list_head olist;
1344 	struct tcon_link *tlink;
1345 	__u8 lease_key[16];
1346 	__u32 oplock;
1347 };
1348 
1349 struct cifs_deferred_close {
1350 	struct list_head dlist;
1351 	struct tcon_link *tlink;
1352 	__u16  netfid;
1353 	__u64  persistent_fid;
1354 	__u64  volatile_fid;
1355 };
1356 
1357 /*
1358  * This info hangs off the cifsFileInfo structure, pointed to by llist.
1359  * This is used to track byte stream locks on the file
1360  */
1361 struct cifsLockInfo {
1362 	struct list_head llist;	/* pointer to next cifsLockInfo */
1363 	struct list_head blist; /* pointer to locks blocked on this */
1364 	wait_queue_head_t block_q;
1365 	__u64 offset;
1366 	__u64 length;
1367 	__u32 pid;
1368 	__u16 type;
1369 	__u16 flags;
1370 };
1371 
1372 /*
1373  * One of these for each open instance of a file
1374  */
1375 struct cifs_search_info {
1376 	loff_t index_of_last_entry;
1377 	__u16 entries_in_buffer;
1378 	__u16 info_level;
1379 	__u32 resume_key;
1380 	char *ntwrk_buf_start;
1381 	char *srch_entries_start;
1382 	char *last_entry;
1383 	const char *presume_name;
1384 	unsigned int resume_name_len;
1385 	bool endOfSearch:1;
1386 	bool emptyDir:1;
1387 	bool unicode:1;
1388 	bool smallBuf:1; /* so we know which buf_release function to call */
1389 };
1390 
1391 #define ACL_NO_MODE	((umode_t)(-1))
1392 struct cifs_open_parms {
1393 	struct cifs_tcon *tcon;
1394 	struct cifs_sb_info *cifs_sb;
1395 	int disposition;
1396 	int desired_access;
1397 	int create_options;
1398 	const char *path;
1399 	struct cifs_fid *fid;
1400 	umode_t mode;
1401 	bool reconnect:1;
1402 	bool replay:1; /* indicates that this open is for a replay */
1403 	struct kvec *ea_cctx;
1404 };
1405 
1406 struct cifs_fid {
1407 	__u16 netfid;
1408 	__u64 persistent_fid;	/* persist file id for smb2 */
1409 	__u64 volatile_fid;	/* volatile file id for smb2 */
1410 	__u8 lease_key[SMB2_LEASE_KEY_SIZE];	/* lease key for smb2 */
1411 	__u8 create_guid[16];
1412 	__u32 access;
1413 	struct cifs_pending_open *pending_open;
1414 	unsigned int epoch;
1415 #ifdef CONFIG_CIFS_DEBUG2
1416 	__u64 mid;
1417 #endif /* CIFS_DEBUG2 */
1418 	bool purge_cache;
1419 };
1420 
1421 struct cifs_fid_locks {
1422 	struct list_head llist;
1423 	struct cifsFileInfo *cfile;	/* fid that owns locks */
1424 	struct list_head locks;		/* locks held by fid above */
1425 };
1426 
1427 struct cifsFileInfo {
1428 	/* following two lists are protected by tcon->open_file_lock */
1429 	struct list_head tlist;	/* pointer to next fid owned by tcon */
1430 	struct list_head flist;	/* next fid (file instance) for this inode */
1431 	/* lock list below protected by cifsi->lock_sem */
1432 	struct cifs_fid_locks *llist;	/* brlocks held by this fid */
1433 	kuid_t uid;		/* allows finding which FileInfo structure */
1434 	__u32 pid;		/* process id who opened file */
1435 	struct cifs_fid fid;	/* file id from remote */
1436 	struct list_head rlist; /* reconnect list */
1437 	/* BB add lock scope info here if needed */
1438 	/* lock scope id (0 if none) */
1439 	struct dentry *dentry;
1440 	struct tcon_link *tlink;
1441 	unsigned int f_flags;
1442 	bool invalidHandle:1;	/* file closed via session abend */
1443 	bool swapfile:1;
1444 	bool oplock_break_cancelled:1;
1445 	bool status_file_deleted:1; /* file has been deleted */
1446 	bool offload:1; /* offload final part of _put to a wq */
1447 	unsigned int oplock_epoch; /* epoch from the lease break */
1448 	__u32 oplock_level; /* oplock/lease level from the lease break */
1449 	int count;
1450 	spinlock_t file_info_lock; /* protects four flag/count fields above */
1451 	struct mutex fh_mutex; /* prevents reopen race after dead ses*/
1452 	struct cifs_search_info srch_inf;
1453 	struct work_struct oplock_break; /* work for oplock breaks */
1454 	struct work_struct put; /* work for the final part of _put */
1455 	struct work_struct serverclose; /* work for serverclose */
1456 	struct delayed_work deferred;
1457 	bool deferred_close_scheduled; /* Flag to indicate close is scheduled */
1458 	char *symlink_target;
1459 };
1460 
1461 struct cifs_io_parms {
1462 	__u16 netfid;
1463 	__u64 persistent_fid;	/* persist file id for smb2 */
1464 	__u64 volatile_fid;	/* volatile file id for smb2 */
1465 	__u32 pid;
1466 	__u64 offset;
1467 	unsigned int length;
1468 	struct cifs_tcon *tcon;
1469 	struct TCP_Server_Info *server;
1470 };
1471 
1472 struct cifs_aio_ctx {
1473 	struct kref		refcount;
1474 	struct list_head	list;
1475 	struct mutex		aio_mutex;
1476 	struct completion	done;
1477 	struct iov_iter		iter;
1478 	struct kiocb		*iocb;
1479 	struct cifsFileInfo	*cfile;
1480 	struct bio_vec		*bv;
1481 	loff_t			pos;
1482 	unsigned int		nr_pinned_pages;
1483 	ssize_t			rc;
1484 	unsigned int		len;
1485 	unsigned int		total_len;
1486 	unsigned int		bv_need_unpin;	/* If ->bv[] needs unpinning */
1487 	bool			should_dirty;
1488 	/*
1489 	 * Indicates if this aio_ctx is for direct_io,
1490 	 * If yes, iter is a copy of the user passed iov_iter
1491 	 */
1492 	bool			direct_io;
1493 };
1494 
1495 /* asynchronous read support */
1496 struct cifs_readdata {
1497 	struct kref			refcount;
1498 	struct list_head		list;
1499 	struct completion		done;
1500 	struct cifsFileInfo		*cfile;
1501 	struct address_space		*mapping;
1502 	struct cifs_aio_ctx		*ctx;
1503 	__u64				offset;
1504 	ssize_t				got_bytes;
1505 	unsigned int			bytes;
1506 	pid_t				pid;
1507 	int				result;
1508 	struct work_struct		work;
1509 	struct iov_iter			iter;
1510 	struct kvec			iov[2];
1511 	struct TCP_Server_Info		*server;
1512 #ifdef CONFIG_CIFS_SMB_DIRECT
1513 	struct smbd_mr			*mr;
1514 #endif
1515 	struct cifs_credits		credits;
1516 };
1517 
1518 /* asynchronous write support */
1519 struct cifs_writedata {
1520 	struct kref			refcount;
1521 	struct list_head		list;
1522 	struct completion		done;
1523 	enum writeback_sync_modes	sync_mode;
1524 	struct work_struct		work;
1525 	struct cifsFileInfo		*cfile;
1526 	struct cifs_aio_ctx		*ctx;
1527 	struct iov_iter			iter;
1528 	struct bio_vec			*bv;
1529 	__u64				offset;
1530 	pid_t				pid;
1531 	unsigned int			bytes;
1532 	int				result;
1533 	struct TCP_Server_Info		*server;
1534 #ifdef CONFIG_CIFS_SMB_DIRECT
1535 	struct smbd_mr			*mr;
1536 #endif
1537 	struct cifs_credits		credits;
1538 	bool				replay;
1539 };
1540 
1541 /*
1542  * Take a reference on the file private data. Must be called with
1543  * cfile->file_info_lock held.
1544  */
1545 static inline void
1546 cifsFileInfo_get_locked(struct cifsFileInfo *cifs_file)
1547 {
1548 	++cifs_file->count;
1549 }
1550 
1551 struct cifsFileInfo *cifsFileInfo_get(struct cifsFileInfo *cifs_file);
1552 void _cifsFileInfo_put(struct cifsFileInfo *cifs_file, bool wait_oplock_hdlr,
1553 		       bool offload);
1554 void cifsFileInfo_put(struct cifsFileInfo *cifs_file);
1555 
1556 #define CIFS_CACHE_READ_FLG	1
1557 #define CIFS_CACHE_HANDLE_FLG	2
1558 #define CIFS_CACHE_RH_FLG	(CIFS_CACHE_READ_FLG | CIFS_CACHE_HANDLE_FLG)
1559 #define CIFS_CACHE_WRITE_FLG	4
1560 #define CIFS_CACHE_RW_FLG	(CIFS_CACHE_READ_FLG | CIFS_CACHE_WRITE_FLG)
1561 #define CIFS_CACHE_RHW_FLG	(CIFS_CACHE_RW_FLG | CIFS_CACHE_HANDLE_FLG)
1562 
1563 #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))
1564 #define CIFS_CACHE_HANDLE(cinode) (cinode->oplock & CIFS_CACHE_HANDLE_FLG)
1565 #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))
1566 
1567 /*
1568  * One of these for each file inode
1569  */
1570 
1571 struct cifsInodeInfo {
1572 	struct netfs_inode netfs; /* Netfslib context and vfs inode */
1573 	bool can_cache_brlcks;
1574 	struct list_head llist;	/* locks helb by this inode */
1575 	/*
1576 	 * NOTE: Some code paths call down_read(lock_sem) twice, so
1577 	 * we must always use cifs_down_write() instead of down_write()
1578 	 * for this semaphore to avoid deadlocks.
1579 	 */
1580 	struct rw_semaphore lock_sem;	/* protect the fields above */
1581 	/* BB add in lists for dirty pages i.e. write caching info for oplock */
1582 	struct list_head openFileList;
1583 	spinlock_t	open_file_lock;	/* protects openFileList */
1584 	__u32 cifsAttrs; /* e.g. DOS archive bit, sparse, compressed, system */
1585 	unsigned int oplock;		/* oplock/lease level we have */
1586 	unsigned int epoch;		/* used to track lease state changes */
1587 #define CIFS_INODE_PENDING_OPLOCK_BREAK   (0) /* oplock break in progress */
1588 #define CIFS_INODE_PENDING_WRITERS	  (1) /* Writes in progress */
1589 #define CIFS_INODE_FLAG_UNUSED		  (2) /* Unused flag */
1590 #define CIFS_INO_DELETE_PENDING		  (3) /* delete pending on server */
1591 #define CIFS_INO_INVALID_MAPPING	  (4) /* pagecache is invalid */
1592 #define CIFS_INO_LOCK			  (5) /* lock bit for synchronization */
1593 #define CIFS_INO_MODIFIED_ATTR            (6) /* Indicate change in mtime/ctime */
1594 #define CIFS_INO_CLOSE_ON_LOCK            (7) /* Not to defer the close when lock is set */
1595 	unsigned long flags;
1596 	spinlock_t writers_lock;
1597 	unsigned int writers;		/* Number of writers on this inode */
1598 	unsigned long time;		/* jiffies of last update of inode */
1599 	u64  server_eof;		/* current file size on server -- protected by i_lock */
1600 	u64  uniqueid;			/* server inode number */
1601 	u64  createtime;		/* creation time on server */
1602 	__u8 lease_key[SMB2_LEASE_KEY_SIZE];	/* lease key for this inode */
1603 	struct list_head deferred_closes; /* list of deferred closes */
1604 	spinlock_t deferred_lock; /* protection on deferred list */
1605 	bool lease_granted; /* Flag to indicate whether lease or oplock is granted. */
1606 	char *symlink_target;
1607 	__u32 reparse_tag;
1608 };
1609 
1610 static inline struct cifsInodeInfo *
1611 CIFS_I(struct inode *inode)
1612 {
1613 	return container_of(inode, struct cifsInodeInfo, netfs.inode);
1614 }
1615 
1616 static inline struct cifs_sb_info *
1617 CIFS_SB(struct super_block *sb)
1618 {
1619 	return sb->s_fs_info;
1620 }
1621 
1622 static inline struct cifs_sb_info *
1623 CIFS_FILE_SB(struct file *file)
1624 {
1625 	return CIFS_SB(file_inode(file)->i_sb);
1626 }
1627 
1628 static inline char CIFS_DIR_SEP(const struct cifs_sb_info *cifs_sb)
1629 {
1630 	if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_POSIX_PATHS)
1631 		return '/';
1632 	else
1633 		return '\\';
1634 }
1635 
1636 static inline void
1637 convert_delimiter(char *path, char delim)
1638 {
1639 	char old_delim, *pos;
1640 
1641 	if (delim == '/')
1642 		old_delim = '\\';
1643 	else
1644 		old_delim = '/';
1645 
1646 	pos = path;
1647 	while ((pos = strchr(pos, old_delim)))
1648 		*pos = delim;
1649 }
1650 
1651 #define cifs_stats_inc atomic_inc
1652 
1653 static inline void cifs_stats_bytes_written(struct cifs_tcon *tcon,
1654 					    unsigned int bytes)
1655 {
1656 	if (bytes) {
1657 		spin_lock(&tcon->stat_lock);
1658 		tcon->bytes_written += bytes;
1659 		spin_unlock(&tcon->stat_lock);
1660 	}
1661 }
1662 
1663 static inline void cifs_stats_bytes_read(struct cifs_tcon *tcon,
1664 					 unsigned int bytes)
1665 {
1666 	spin_lock(&tcon->stat_lock);
1667 	tcon->bytes_read += bytes;
1668 	spin_unlock(&tcon->stat_lock);
1669 }
1670 
1671 
1672 /*
1673  * This is the prototype for the mid receive function. This function is for
1674  * receiving the rest of the SMB frame, starting with the WordCount (which is
1675  * just after the MID in struct smb_hdr). Note:
1676  *
1677  * - This will be called by cifsd, with no locks held.
1678  * - The mid will still be on the pending_mid_q.
1679  * - mid->resp_buf will point to the current buffer.
1680  *
1681  * Returns zero on a successful receive, or an error. The receive state in
1682  * the TCP_Server_Info will also be updated.
1683  */
1684 typedef int (mid_receive_t)(struct TCP_Server_Info *server,
1685 			    struct mid_q_entry *mid);
1686 
1687 /*
1688  * This is the prototype for the mid callback function. This is called once the
1689  * mid has been received off of the socket. When creating one, take special
1690  * care to avoid deadlocks. Things to bear in mind:
1691  *
1692  * - it will be called by cifsd, with no locks held
1693  * - the mid will be removed from any lists
1694  */
1695 typedef void (mid_callback_t)(struct mid_q_entry *mid);
1696 
1697 /*
1698  * This is the protopyte for mid handle function. This is called once the mid
1699  * has been recognized after decryption of the message.
1700  */
1701 typedef int (mid_handle_t)(struct TCP_Server_Info *server,
1702 			    struct mid_q_entry *mid);
1703 
1704 /* one of these for every pending CIFS request to the server */
1705 struct mid_q_entry {
1706 	struct list_head qhead;	/* mids waiting on reply from this server */
1707 	struct kref refcount;
1708 	struct TCP_Server_Info *server;	/* server corresponding to this mid */
1709 	__u64 mid;		/* multiplex id */
1710 	__u16 credits;		/* number of credits consumed by this mid */
1711 	__u16 credits_received;	/* number of credits from the response */
1712 	__u32 pid;		/* process id */
1713 	__u32 sequence_number;  /* for CIFS signing */
1714 	unsigned long when_alloc;  /* when mid was created */
1715 #ifdef CONFIG_CIFS_STATS2
1716 	unsigned long when_sent; /* time when smb send finished */
1717 	unsigned long when_received; /* when demux complete (taken off wire) */
1718 #endif
1719 	mid_receive_t *receive; /* call receive callback */
1720 	mid_callback_t *callback; /* call completion callback */
1721 	mid_handle_t *handle; /* call handle mid callback */
1722 	void *callback_data;	  /* general purpose pointer for callback */
1723 	struct task_struct *creator;
1724 	void *resp_buf;		/* pointer to received SMB header */
1725 	unsigned int resp_buf_size;
1726 	int mid_state;	/* wish this were enum but can not pass to wait_event */
1727 	unsigned int mid_flags;
1728 	__le16 command;		/* smb command code */
1729 	unsigned int optype;	/* operation type */
1730 	bool large_buf:1;	/* if valid response, is pointer to large buf */
1731 	bool multiRsp:1;	/* multiple trans2 responses for one request  */
1732 	bool multiEnd:1;	/* both received */
1733 	bool decrypted:1;	/* decrypted entry */
1734 };
1735 
1736 struct close_cancelled_open {
1737 	struct cifs_fid         fid;
1738 	struct cifs_tcon        *tcon;
1739 	struct work_struct      work;
1740 	__u64 mid;
1741 	__u16 cmd;
1742 };
1743 
1744 /*	Make code in transport.c a little cleaner by moving
1745 	update of optional stats into function below */
1746 static inline void cifs_in_send_inc(struct TCP_Server_Info *server)
1747 {
1748 	atomic_inc(&server->in_send);
1749 }
1750 
1751 static inline void cifs_in_send_dec(struct TCP_Server_Info *server)
1752 {
1753 	atomic_dec(&server->in_send);
1754 }
1755 
1756 static inline void cifs_num_waiters_inc(struct TCP_Server_Info *server)
1757 {
1758 	atomic_inc(&server->num_waiters);
1759 }
1760 
1761 static inline void cifs_num_waiters_dec(struct TCP_Server_Info *server)
1762 {
1763 	atomic_dec(&server->num_waiters);
1764 }
1765 
1766 #ifdef CONFIG_CIFS_STATS2
1767 static inline void cifs_save_when_sent(struct mid_q_entry *mid)
1768 {
1769 	mid->when_sent = jiffies;
1770 }
1771 #else
1772 static inline void cifs_save_when_sent(struct mid_q_entry *mid)
1773 {
1774 }
1775 #endif
1776 
1777 /* for pending dnotify requests */
1778 struct dir_notify_req {
1779 	struct list_head lhead;
1780 	__le16 Pid;
1781 	__le16 PidHigh;
1782 	__u16 Mid;
1783 	__u16 Tid;
1784 	__u16 Uid;
1785 	__u16 netfid;
1786 	__u32 filter; /* CompletionFilter (for multishot) */
1787 	int multishot;
1788 	struct file *pfile;
1789 };
1790 
1791 struct dfs_info3_param {
1792 	int flags; /* DFSREF_REFERRAL_SERVER, DFSREF_STORAGE_SERVER*/
1793 	int path_consumed;
1794 	int server_type;
1795 	int ref_flag;
1796 	char *path_name;
1797 	char *node_name;
1798 	int ttl;
1799 };
1800 
1801 struct file_list {
1802 	struct list_head list;
1803 	struct cifsFileInfo *cfile;
1804 };
1805 
1806 struct cifs_mount_ctx {
1807 	struct cifs_sb_info *cifs_sb;
1808 	struct smb3_fs_context *fs_ctx;
1809 	unsigned int xid;
1810 	struct TCP_Server_Info *server;
1811 	struct cifs_ses *ses;
1812 	struct cifs_tcon *tcon;
1813 };
1814 
1815 static inline void __free_dfs_info_param(struct dfs_info3_param *param)
1816 {
1817 	kfree(param->path_name);
1818 	kfree(param->node_name);
1819 }
1820 
1821 static inline void free_dfs_info_param(struct dfs_info3_param *param)
1822 {
1823 	if (param)
1824 		__free_dfs_info_param(param);
1825 }
1826 
1827 static inline void zfree_dfs_info_param(struct dfs_info3_param *param)
1828 {
1829 	if (param) {
1830 		__free_dfs_info_param(param);
1831 		memset(param, 0, sizeof(*param));
1832 	}
1833 }
1834 
1835 static inline void free_dfs_info_array(struct dfs_info3_param *param,
1836 				       int number_of_items)
1837 {
1838 	int i;
1839 
1840 	if ((number_of_items == 0) || (param == NULL))
1841 		return;
1842 	for (i = 0; i < number_of_items; i++) {
1843 		kfree(param[i].path_name);
1844 		kfree(param[i].node_name);
1845 	}
1846 	kfree(param);
1847 }
1848 
1849 static inline bool is_interrupt_error(int error)
1850 {
1851 	switch (error) {
1852 	case -EINTR:
1853 	case -ERESTARTSYS:
1854 	case -ERESTARTNOHAND:
1855 	case -ERESTARTNOINTR:
1856 		return true;
1857 	}
1858 	return false;
1859 }
1860 
1861 static inline bool is_retryable_error(int error)
1862 {
1863 	if (is_interrupt_error(error) || error == -EAGAIN)
1864 		return true;
1865 	return false;
1866 }
1867 
1868 static inline bool is_replayable_error(int error)
1869 {
1870 	if (error == -EAGAIN || error == -ECONNABORTED)
1871 		return true;
1872 	return false;
1873 }
1874 
1875 
1876 /* cifs_get_writable_file() flags */
1877 #define FIND_WR_ANY         0
1878 #define FIND_WR_FSUID_ONLY  1
1879 #define FIND_WR_WITH_DELETE 2
1880 
1881 #define   MID_FREE 0
1882 #define   MID_REQUEST_ALLOCATED 1
1883 #define   MID_REQUEST_SUBMITTED 2
1884 #define   MID_RESPONSE_RECEIVED 4
1885 #define   MID_RETRY_NEEDED      8 /* session closed while this request out */
1886 #define   MID_RESPONSE_MALFORMED 0x10
1887 #define   MID_SHUTDOWN		 0x20
1888 #define   MID_RESPONSE_READY 0x40 /* ready for other process handle the rsp */
1889 
1890 /* Flags */
1891 #define   MID_WAIT_CANCELLED	 1 /* Cancelled while waiting for response */
1892 #define   MID_DELETED            2 /* Mid has been dequeued/deleted */
1893 
1894 /* Types of response buffer returned from SendReceive2 */
1895 #define   CIFS_NO_BUFFER        0    /* Response buffer not returned */
1896 #define   CIFS_SMALL_BUFFER     1
1897 #define   CIFS_LARGE_BUFFER     2
1898 #define   CIFS_IOVEC            4    /* array of response buffers */
1899 
1900 /* Type of Request to SendReceive2 */
1901 #define   CIFS_BLOCKING_OP      1    /* operation can block */
1902 #define   CIFS_NON_BLOCKING     2    /* do not block waiting for credits */
1903 #define   CIFS_TIMEOUT_MASK 0x003    /* only one of above set in req */
1904 #define   CIFS_LOG_ERROR    0x010    /* log NT STATUS if non-zero */
1905 #define   CIFS_LARGE_BUF_OP 0x020    /* large request buffer */
1906 #define   CIFS_NO_RSP_BUF   0x040    /* no response buffer required */
1907 
1908 /* Type of request operation */
1909 #define   CIFS_ECHO_OP            0x080  /* echo request */
1910 #define   CIFS_OBREAK_OP          0x0100 /* oplock break request */
1911 #define   CIFS_NEG_OP             0x0200 /* negotiate request */
1912 #define   CIFS_CP_CREATE_CLOSE_OP 0x0400 /* compound create+close request */
1913 /* Lower bitmask values are reserved by others below. */
1914 #define   CIFS_SESS_OP            0x2000 /* session setup request */
1915 #define   CIFS_OP_MASK            0x2780 /* mask request type */
1916 
1917 #define   CIFS_HAS_CREDITS        0x0400 /* already has credits */
1918 #define   CIFS_TRANSFORM_REQ      0x0800 /* transform request before sending */
1919 #define   CIFS_NO_SRV_RSP         0x1000 /* there is no server response */
1920 
1921 /* Security Flags: indicate type of session setup needed */
1922 #define   CIFSSEC_MAY_SIGN	0x00001
1923 #define   CIFSSEC_MAY_NTLMV2	0x00004
1924 #define   CIFSSEC_MAY_KRB5	0x00008
1925 #define   CIFSSEC_MAY_SEAL	0x00040
1926 #define   CIFSSEC_MAY_NTLMSSP	0x00080 /* raw ntlmssp with ntlmv2 */
1927 
1928 #define   CIFSSEC_MUST_SIGN	0x01001
1929 /* note that only one of the following can be set so the
1930 result of setting MUST flags more than once will be to
1931 require use of the stronger protocol */
1932 #define   CIFSSEC_MUST_NTLMV2	0x04004
1933 #define   CIFSSEC_MUST_KRB5	0x08008
1934 #ifdef CONFIG_CIFS_UPCALL
1935 #define   CIFSSEC_MASK          0xCF0CF /* flags supported if no weak allowed */
1936 #else
1937 #define	  CIFSSEC_MASK          0xC70C7 /* flags supported if no weak allowed */
1938 #endif /* UPCALL */
1939 #define   CIFSSEC_MUST_SEAL	0x40040
1940 #define   CIFSSEC_MUST_NTLMSSP	0x80080 /* raw ntlmssp with ntlmv2 */
1941 
1942 #define   CIFSSEC_DEF (CIFSSEC_MAY_SIGN | CIFSSEC_MAY_NTLMV2 | CIFSSEC_MAY_NTLMSSP | CIFSSEC_MAY_SEAL)
1943 #define   CIFSSEC_MAX (CIFSSEC_MAY_SIGN | CIFSSEC_MUST_KRB5 | CIFSSEC_MAY_SEAL)
1944 #define   CIFSSEC_AUTH_MASK (CIFSSEC_MAY_NTLMV2 | CIFSSEC_MAY_KRB5 | CIFSSEC_MAY_NTLMSSP)
1945 /*
1946  *****************************************************************
1947  * All constants go here
1948  *****************************************************************
1949  */
1950 
1951 #define UID_HASH (16)
1952 
1953 /*
1954  * Note that ONE module should define _DECLARE_GLOBALS_HERE to cause the
1955  * following to be declared.
1956  */
1957 
1958 /****************************************************************************
1959  * Here are all the locks (spinlock, mutex, semaphore) in cifs.ko, arranged according
1960  * to the locking order. i.e. if two locks are to be held together, the lock that
1961  * appears higher in this list needs to be taken before the other.
1962  *
1963  * If you hold a lock that is lower in this list, and you need to take a higher lock
1964  * (or if you think that one of the functions that you're calling may need to), first
1965  * drop the lock you hold, pick up the higher lock, then the lower one. This will
1966  * ensure that locks are picked up only in one direction in the below table
1967  * (top to bottom).
1968  *
1969  * Also, if you expect a function to be called with a lock held, explicitly document
1970  * this in the comments on top of your function definition.
1971  *
1972  * And also, try to keep the critical sections (lock hold time) to be as minimal as
1973  * possible. Blocking / calling other functions with a lock held always increase
1974  * the risk of a possible deadlock.
1975  *
1976  * Following this rule will avoid unnecessary deadlocks, which can get really hard to
1977  * debug. Also, any new lock that you introduce, please add to this list in the correct
1978  * order.
1979  *
1980  * Please populate this list whenever you introduce new locks in your changes. Or in
1981  * case I've missed some existing locks. Please ensure that it's added in the list
1982  * based on the locking order expected.
1983  *
1984  * =====================================================================================
1985  * Lock				Protects			Initialization fn
1986  * =====================================================================================
1987  * vol_list_lock
1988  * vol_info->ctx_lock		vol_info->ctx
1989  * cifs_sb_info->tlink_tree_lock	cifs_sb_info->tlink_tree	cifs_setup_cifs_sb
1990  * TCP_Server_Info->		TCP_Server_Info			cifs_get_tcp_session
1991  * reconnect_mutex
1992  * TCP_Server_Info->srv_mutex	TCP_Server_Info			cifs_get_tcp_session
1993  * cifs_ses->session_mutex		cifs_ses		sesInfoAlloc
1994  *				cifs_tcon
1995  * cifs_tcon->open_file_lock	cifs_tcon->openFileList		tconInfoAlloc
1996  *				cifs_tcon->pending_opens
1997  * cifs_tcon->stat_lock		cifs_tcon->bytes_read		tconInfoAlloc
1998  *				cifs_tcon->bytes_written
1999  * cifs_tcp_ses_lock		cifs_tcp_ses_list		sesInfoAlloc
2000  * GlobalMid_Lock		GlobalMaxActiveXid		init_cifs
2001  *				GlobalCurrentXid
2002  *				GlobalTotalActiveXid
2003  * TCP_Server_Info->srv_lock	(anything in struct not protected by another lock and can change)
2004  * TCP_Server_Info->mid_lock	TCP_Server_Info->pending_mid_q	cifs_get_tcp_session
2005  *				->CurrentMid
2006  *				(any changes in mid_q_entry fields)
2007  * TCP_Server_Info->req_lock	TCP_Server_Info->in_flight	cifs_get_tcp_session
2008  *				->credits
2009  *				->echo_credits
2010  *				->oplock_credits
2011  *				->reconnect_instance
2012  * cifs_ses->ses_lock		(anything that is not protected by another lock and can change)
2013  * cifs_ses->iface_lock		cifs_ses->iface_list		sesInfoAlloc
2014  *				->iface_count
2015  *				->iface_last_update
2016  * cifs_ses->chan_lock		cifs_ses->chans
2017  *				->chans_need_reconnect
2018  *				->chans_in_reconnect
2019  * cifs_tcon->tc_lock		(anything that is not protected by another lock and can change)
2020  * cifsInodeInfo->open_file_lock	cifsInodeInfo->openFileList	cifs_alloc_inode
2021  * cifsInodeInfo->writers_lock	cifsInodeInfo->writers		cifsInodeInfo_alloc
2022  * cifsInodeInfo->lock_sem	cifsInodeInfo->llist		cifs_init_once
2023  *				->can_cache_brlcks
2024  * cifsInodeInfo->deferred_lock	cifsInodeInfo->deferred_closes	cifsInodeInfo_alloc
2025  * cached_fid->fid_mutex		cifs_tcon->crfid		tcon_info_alloc
2026  * cifsFileInfo->fh_mutex		cifsFileInfo			cifs_new_fileinfo
2027  * cifsFileInfo->file_info_lock	cifsFileInfo->count		cifs_new_fileinfo
2028  *				->invalidHandle			initiate_cifs_search
2029  *				->oplock_break_cancelled
2030  * cifs_aio_ctx->aio_mutex		cifs_aio_ctx			cifs_aio_ctx_alloc
2031  ****************************************************************************/
2032 
2033 #ifdef DECLARE_GLOBALS_HERE
2034 #define GLOBAL_EXTERN
2035 #else
2036 #define GLOBAL_EXTERN extern
2037 #endif
2038 
2039 /*
2040  * the list of TCP_Server_Info structures, ie each of the sockets
2041  * connecting our client to a distinct server (ip address), is
2042  * chained together by cifs_tcp_ses_list. The list of all our SMB
2043  * sessions (and from that the tree connections) can be found
2044  * by iterating over cifs_tcp_ses_list
2045  */
2046 extern struct list_head		cifs_tcp_ses_list;
2047 
2048 /*
2049  * This lock protects the cifs_tcp_ses_list, the list of smb sessions per
2050  * tcp session, and the list of tcon's per smb session. It also protects
2051  * the reference counters for the server, smb session, and tcon.
2052  * generally the locks should be taken in order tcp_ses_lock before
2053  * tcon->open_file_lock and that before file->file_info_lock since the
2054  * structure order is cifs_socket-->cifs_ses-->cifs_tcon-->cifs_file
2055  */
2056 extern spinlock_t		cifs_tcp_ses_lock;
2057 
2058 /*
2059  * Global transaction id (XID) information
2060  */
2061 extern unsigned int GlobalCurrentXid;	/* protected by GlobalMid_Sem */
2062 extern unsigned int GlobalTotalActiveXid; /* prot by GlobalMid_Sem */
2063 extern unsigned int GlobalMaxActiveXid;	/* prot by GlobalMid_Sem */
2064 extern spinlock_t GlobalMid_Lock; /* protects above & list operations on midQ entries */
2065 
2066 /*
2067  *  Global counters, updated atomically
2068  */
2069 extern atomic_t sesInfoAllocCount;
2070 extern atomic_t tconInfoAllocCount;
2071 extern atomic_t tcpSesNextId;
2072 extern atomic_t tcpSesAllocCount;
2073 extern atomic_t tcpSesReconnectCount;
2074 extern atomic_t tconInfoReconnectCount;
2075 
2076 /* Various Debug counters */
2077 extern atomic_t buf_alloc_count;	/* current number allocated  */
2078 extern atomic_t small_buf_alloc_count;
2079 #ifdef CONFIG_CIFS_STATS2
2080 extern atomic_t total_buf_alloc_count; /* total allocated over all time */
2081 extern atomic_t total_small_buf_alloc_count;
2082 extern unsigned int slow_rsp_threshold; /* number of secs before logging */
2083 #endif
2084 
2085 /* Misc globals */
2086 extern bool enable_oplocks; /* enable or disable oplocks */
2087 extern bool lookupCacheEnabled;
2088 extern unsigned int global_secflags;	/* if on, session setup sent
2089 				with more secure ntlmssp2 challenge/resp */
2090 extern unsigned int sign_CIFS_PDUs;  /* enable smb packet signing */
2091 extern bool enable_gcm_256; /* allow optional negotiate of strongest signing (aes-gcm-256) */
2092 extern bool require_gcm_256; /* require use of strongest signing (aes-gcm-256) */
2093 extern bool enable_negotiate_signing; /* request use of faster (GMAC) signing if available */
2094 extern bool linuxExtEnabled;/*enable Linux/Unix CIFS extensions*/
2095 extern unsigned int CIFSMaxBufSize;  /* max size not including hdr */
2096 extern unsigned int cifs_min_rcv;    /* min size of big ntwrk buf pool */
2097 extern unsigned int cifs_min_small;  /* min size of small buf pool */
2098 extern unsigned int cifs_max_pending; /* MAX requests at once to server*/
2099 extern unsigned int dir_cache_timeout; /* max time for directory lease caching of dir */
2100 extern bool disable_legacy_dialects;  /* forbid vers=1.0 and vers=2.0 mounts */
2101 extern atomic_t mid_count;
2102 
2103 void cifs_oplock_break(struct work_struct *work);
2104 void cifs_queue_oplock_break(struct cifsFileInfo *cfile);
2105 void smb2_deferred_work_close(struct work_struct *work);
2106 
2107 extern const struct slow_work_ops cifs_oplock_break_ops;
2108 extern struct workqueue_struct *cifsiod_wq;
2109 extern struct workqueue_struct *decrypt_wq;
2110 extern struct workqueue_struct *fileinfo_put_wq;
2111 extern struct workqueue_struct *cifsoplockd_wq;
2112 extern struct workqueue_struct *deferredclose_wq;
2113 extern struct workqueue_struct *serverclose_wq;
2114 extern __u32 cifs_lock_secret;
2115 
2116 extern mempool_t *cifs_sm_req_poolp;
2117 extern mempool_t *cifs_req_poolp;
2118 extern mempool_t *cifs_mid_poolp;
2119 
2120 /* Operations for different SMB versions */
2121 #define SMB1_VERSION_STRING	"1.0"
2122 #define SMB20_VERSION_STRING    "2.0"
2123 #ifdef CONFIG_CIFS_ALLOW_INSECURE_LEGACY
2124 extern struct smb_version_operations smb1_operations;
2125 extern struct smb_version_values smb1_values;
2126 extern struct smb_version_operations smb20_operations;
2127 extern struct smb_version_values smb20_values;
2128 #endif /* CIFS_ALLOW_INSECURE_LEGACY */
2129 #define SMB21_VERSION_STRING	"2.1"
2130 extern struct smb_version_operations smb21_operations;
2131 extern struct smb_version_values smb21_values;
2132 #define SMBDEFAULT_VERSION_STRING "default"
2133 extern struct smb_version_values smbdefault_values;
2134 #define SMB3ANY_VERSION_STRING "3"
2135 extern struct smb_version_values smb3any_values;
2136 #define SMB30_VERSION_STRING	"3.0"
2137 extern struct smb_version_operations smb30_operations;
2138 extern struct smb_version_values smb30_values;
2139 #define SMB302_VERSION_STRING	"3.02"
2140 #define ALT_SMB302_VERSION_STRING "3.0.2"
2141 /*extern struct smb_version_operations smb302_operations;*/ /* not needed yet */
2142 extern struct smb_version_values smb302_values;
2143 #define SMB311_VERSION_STRING	"3.1.1"
2144 #define ALT_SMB311_VERSION_STRING "3.11"
2145 extern struct smb_version_operations smb311_operations;
2146 extern struct smb_version_values smb311_values;
2147 
2148 static inline char *get_security_type_str(enum securityEnum sectype)
2149 {
2150 	switch (sectype) {
2151 	case RawNTLMSSP:
2152 		return "RawNTLMSSP";
2153 	case Kerberos:
2154 		return "Kerberos";
2155 	case NTLMv2:
2156 		return "NTLMv2";
2157 	default:
2158 		return "Unknown";
2159 	}
2160 }
2161 
2162 static inline bool is_smb1_server(struct TCP_Server_Info *server)
2163 {
2164 	return strcmp(server->vals->version_string, SMB1_VERSION_STRING) == 0;
2165 }
2166 
2167 static inline bool is_tcon_dfs(struct cifs_tcon *tcon)
2168 {
2169 	/*
2170 	 * For SMB1, see MS-CIFS 2.4.55 SMB_COM_TREE_CONNECT_ANDX (0x75) and MS-CIFS 3.3.4.4 DFS
2171 	 * Subsystem Notifies That a Share Is a DFS Share.
2172 	 *
2173 	 * For SMB2+, see MS-SMB2 2.2.10 SMB2 TREE_CONNECT Response and MS-SMB2 3.3.4.14 Server
2174 	 * Application Updates a Share.
2175 	 */
2176 	if (!tcon || !tcon->ses || !tcon->ses->server)
2177 		return false;
2178 	return is_smb1_server(tcon->ses->server) ? tcon->Flags & SMB_SHARE_IS_IN_DFS :
2179 		tcon->share_flags & (SHI1005_FLAGS_DFS | SHI1005_FLAGS_DFS_ROOT);
2180 }
2181 
2182 static inline bool cifs_is_referral_server(struct cifs_tcon *tcon,
2183 					   const struct dfs_info3_param *ref)
2184 {
2185 	/*
2186 	 * Check if all targets are capable of handling DFS referrals as per
2187 	 * MS-DFSC 2.2.4 RESP_GET_DFS_REFERRAL.
2188 	 */
2189 	return is_tcon_dfs(tcon) || (ref && (ref->flags & DFSREF_REFERRAL_SERVER));
2190 }
2191 
2192 static inline u64 cifs_flock_len(const struct file_lock *fl)
2193 {
2194 	return (u64)fl->fl_end - fl->fl_start + 1;
2195 }
2196 
2197 static inline size_t ntlmssp_workstation_name_size(const struct cifs_ses *ses)
2198 {
2199 	if (WARN_ON_ONCE(!ses || !ses->server))
2200 		return 0;
2201 	/*
2202 	 * Make workstation name no more than 15 chars when using insecure dialects as some legacy
2203 	 * servers do require it during NTLMSSP.
2204 	 */
2205 	if (ses->server->dialect <= SMB20_PROT_ID)
2206 		return min_t(size_t, sizeof(ses->workstation_name), RFC1001_NAME_LEN_WITH_NULL);
2207 	return sizeof(ses->workstation_name);
2208 }
2209 
2210 static inline void move_cifs_info_to_smb2(struct smb2_file_all_info *dst, const FILE_ALL_INFO *src)
2211 {
2212 	memcpy(dst, src, (size_t)((u8 *)&src->AccessFlags - (u8 *)src));
2213 	dst->AccessFlags = src->AccessFlags;
2214 	dst->CurrentByteOffset = src->CurrentByteOffset;
2215 	dst->Mode = src->Mode;
2216 	dst->AlignmentRequirement = src->AlignmentRequirement;
2217 	dst->FileNameLength = src->FileNameLength;
2218 }
2219 
2220 static inline int cifs_get_num_sgs(const struct smb_rqst *rqst,
2221 				   int num_rqst,
2222 				   const u8 *sig)
2223 {
2224 	unsigned int len, skip;
2225 	unsigned int nents = 0;
2226 	unsigned long addr;
2227 	size_t data_size;
2228 	int i, j;
2229 
2230 	/*
2231 	 * The first rqst has a transform header where the first 20 bytes are
2232 	 * not part of the encrypted blob.
2233 	 */
2234 	skip = 20;
2235 
2236 	/* Assumes the first rqst has a transform header as the first iov.
2237 	 * I.e.
2238 	 * rqst[0].rq_iov[0]  is transform header
2239 	 * rqst[0].rq_iov[1+] data to be encrypted/decrypted
2240 	 * rqst[1+].rq_iov[0+] data to be encrypted/decrypted
2241 	 */
2242 	for (i = 0; i < num_rqst; i++) {
2243 		data_size = iov_iter_count(&rqst[i].rq_iter);
2244 
2245 		/* We really don't want a mixture of pinned and unpinned pages
2246 		 * in the sglist.  It's hard to keep track of which is what.
2247 		 * Instead, we convert to a BVEC-type iterator higher up.
2248 		 */
2249 		if (data_size &&
2250 		    WARN_ON_ONCE(user_backed_iter(&rqst[i].rq_iter)))
2251 			return -EIO;
2252 
2253 		/* We also don't want to have any extra refs or pins to clean
2254 		 * up in the sglist.
2255 		 */
2256 		if (data_size &&
2257 		    WARN_ON_ONCE(iov_iter_extract_will_pin(&rqst[i].rq_iter)))
2258 			return -EIO;
2259 
2260 		for (j = 0; j < rqst[i].rq_nvec; j++) {
2261 			struct kvec *iov = &rqst[i].rq_iov[j];
2262 
2263 			addr = (unsigned long)iov->iov_base + skip;
2264 			if (unlikely(is_vmalloc_addr((void *)addr))) {
2265 				len = iov->iov_len - skip;
2266 				nents += DIV_ROUND_UP(offset_in_page(addr) + len,
2267 						      PAGE_SIZE);
2268 			} else {
2269 				nents++;
2270 			}
2271 			skip = 0;
2272 		}
2273 		if (data_size)
2274 			nents += iov_iter_npages(&rqst[i].rq_iter, INT_MAX);
2275 	}
2276 	nents += DIV_ROUND_UP(offset_in_page(sig) + SMB2_SIGNATURE_SIZE, PAGE_SIZE);
2277 	return nents;
2278 }
2279 
2280 /* We can not use the normal sg_set_buf() as we will sometimes pass a
2281  * stack object as buf.
2282  */
2283 static inline void cifs_sg_set_buf(struct sg_table *sgtable,
2284 				   const void *buf,
2285 				   unsigned int buflen)
2286 {
2287 	unsigned long addr = (unsigned long)buf;
2288 	unsigned int off = offset_in_page(addr);
2289 
2290 	addr &= PAGE_MASK;
2291 	if (unlikely(is_vmalloc_addr((void *)addr))) {
2292 		do {
2293 			unsigned int len = min_t(unsigned int, buflen, PAGE_SIZE - off);
2294 
2295 			sg_set_page(&sgtable->sgl[sgtable->nents++],
2296 				    vmalloc_to_page((void *)addr), len, off);
2297 
2298 			off = 0;
2299 			addr += PAGE_SIZE;
2300 			buflen -= len;
2301 		} while (buflen);
2302 	} else {
2303 		sg_set_page(&sgtable->sgl[sgtable->nents++],
2304 			    virt_to_page((void *)addr), buflen, off);
2305 	}
2306 }
2307 
2308 #define CIFS_OPARMS(_cifs_sb, _tcon, _path, _da, _cd, _co, _mode) \
2309 	((struct cifs_open_parms) { \
2310 		.tcon = _tcon, \
2311 		.path = _path, \
2312 		.desired_access = (_da), \
2313 		.disposition = (_cd), \
2314 		.create_options = cifs_create_options(_cifs_sb, (_co)), \
2315 		.mode = (_mode), \
2316 		.cifs_sb = _cifs_sb, \
2317 	})
2318 
2319 struct smb2_compound_vars {
2320 	struct cifs_open_parms oparms;
2321 	struct kvec rsp_iov[MAX_COMPOUND];
2322 	struct smb_rqst rqst[MAX_COMPOUND];
2323 	struct kvec open_iov[SMB2_CREATE_IOV_SIZE];
2324 	struct kvec qi_iov;
2325 	struct kvec io_iov[SMB2_IOCTL_IOV_SIZE];
2326 	struct kvec si_iov[SMB2_SET_INFO_IOV_SIZE];
2327 	struct kvec close_iov;
2328 	struct smb2_file_rename_info rename_info;
2329 	struct smb2_file_link_info link_info;
2330 	struct kvec ea_iov;
2331 };
2332 
2333 static inline bool cifs_ses_exiting(struct cifs_ses *ses)
2334 {
2335 	bool ret;
2336 
2337 	spin_lock(&ses->ses_lock);
2338 	ret = ses->ses_status == SES_EXITING;
2339 	spin_unlock(&ses->ses_lock);
2340 	return ret;
2341 }
2342 
2343 #endif	/* _CIFS_GLOB_H */
2344