1 /* SPDX-License-Identifier: LGPL-2.1 */
5 * Copyright (C) International Business Machines Corp., 2002,2008
6 * Author(s): Steve French (sfrench@us.ibm.com)
7 * Jeremy Allison (jra@samba.org)
14 #include <linux/in6.h>
15 #include <linux/inet.h>
16 #include <linux/slab.h>
17 #include <linux/mempool.h>
18 #include <linux/workqueue.h>
19 #include "cifs_fs_sb.h"
21 #include <crypto/internal/hash.h>
22 #include <linux/scatterlist.h>
23 #include <uapi/linux/cifs/cifs_mount.h>
26 #define CIFS_MAGIC_NUMBER 0xFF534D42 /* the first four bytes of SMB PDUs */
28 #define SMB_PATH_MAX 260
30 #define RFC1001_PORT 139
33 * The sizes of various internal tables and strings
35 #define MAX_UID_INFO 16
36 #define MAX_SES_INFO 2
37 #define MAX_TCON_INFO 4
39 #define MAX_TREE_SIZE (2 + CIFS_NI_MAXHOST + 1 + CIFS_MAX_SHARE_LEN + 1)
41 #define CIFS_MIN_RCV_POOL 4
43 #define MAX_REOPEN_ATT 5 /* these many maximum attempts to reopen a file */
45 * default attribute cache timeout (jiffies)
47 #define CIFS_DEF_ACTIMEO (1 * HZ)
50 * max attribute cache timeout (jiffies) - 2^30
52 #define CIFS_MAX_ACTIMEO (1 << 30)
55 * Max persistent and resilient handle timeout (milliseconds).
56 * Windows durable max was 960000 (16 minutes)
58 #define SMB3_MAX_HANDLE_TIMEOUT 960000
61 * MAX_REQ is the maximum number of requests that WE will send
62 * on one socket concurrently.
64 #define CIFS_MAX_REQ 32767
66 #define RFC1001_NAME_LEN 15
67 #define RFC1001_NAME_LEN_WITH_NULL (RFC1001_NAME_LEN + 1)
69 /* maximum length of ip addr as a string (including ipv6 and sctp) */
70 #define SERVER_NAME_LENGTH 80
71 #define SERVER_NAME_LEN_WITH_NULL (SERVER_NAME_LENGTH + 1)
73 /* echo interval in seconds */
74 #define SMB_ECHO_INTERVAL_MIN 1
75 #define SMB_ECHO_INTERVAL_MAX 600
76 #define SMB_ECHO_INTERVAL_DEFAULT 60
78 /* maximum number of PDUs in one compound */
79 #define MAX_COMPOUND 5
82 * Default number of credits to keep available for SMB3.
83 * This value is chosen somewhat arbitrarily. The Windows client
84 * defaults to 128 credits, the Windows server allows clients up to
85 * 512 credits (or 8K for later versions), and the NetApp server
86 * does not limit clients at all. Choose a high enough default value
87 * such that the client shouldn't limit performance, but allow mount
88 * to override (until you approach 64K, where we limit credits to 65000
89 * to reduce possibility of seeing more server credit overflow bugs.
91 #define SMB2_MAX_CREDITS_AVAILABLE 32000
95 #ifndef XATTR_DOS_ATTRIB
96 #define XATTR_DOS_ATTRIB "user.DOSATTRIB"
100 * CIFS vfs client Status information (based on what we know.)
103 /* associated with each tcp and smb session */
113 Unspecified = 0, /* not specified */
114 LANMAN, /* Legacy LANMAN auth */
115 NTLM, /* Legacy NTLM012 auth with NTLM hash */
116 NTLMv2, /* Legacy NTLM auth with NTLMv2 hash */
117 RawNTLMSSP, /* NTLMSSP without SPNEGO, NTLMv2 hash */
118 Kerberos, /* Kerberos via SPNEGO */
126 /* crypto security descriptor definition */
128 struct shash_desc shash;
132 /* crypto hashing related structure/fields, not specific to a sec mech */
133 struct cifs_secmech {
134 struct crypto_shash *hmacmd5; /* hmac-md5 hash function */
135 struct crypto_shash *md5; /* md5 hash function */
136 struct crypto_shash *hmacsha256; /* hmac-sha256 hash function */
137 struct crypto_shash *cmacaes; /* block-cipher based MAC function */
138 struct crypto_shash *sha512; /* sha512 hash function */
139 struct sdesc *sdeschmacmd5; /* ctxt to generate ntlmv2 hash, CR1 */
140 struct sdesc *sdescmd5; /* ctxt to generate cifs/smb signature */
141 struct sdesc *sdeschmacsha256; /* ctxt to generate smb2 signature */
142 struct sdesc *sdesccmacaes; /* ctxt to generate smb3 signature */
143 struct sdesc *sdescsha512; /* ctxt to generate smb3.11 signing key */
144 struct crypto_aead *ccmaesencrypt; /* smb3 encryption aead */
145 struct crypto_aead *ccmaesdecrypt; /* smb3 decryption aead */
148 /* per smb session structure/fields */
149 struct ntlmssp_auth {
150 bool sesskey_per_smbsess; /* whether session key is per smb session */
151 __u32 client_flags; /* sent by client in type 1 ntlmsssp exchange */
152 __u32 server_flags; /* sent by server in type 2 ntlmssp exchange */
153 unsigned char ciphertext[CIFS_CPHTXT_SIZE]; /* sent to server */
154 char cryptkey[CIFS_CRYPTO_KEY_SIZE]; /* used by ntlmssp */
162 struct cifs_sid osid;
163 struct cifs_sid gsid;
164 struct cifs_ntace *ntaces;
165 struct cifs_ace *aces;
169 *****************************************************************
170 * Except the CIFS PDUs themselves all the
171 * globally interesting structs should go here
172 *****************************************************************
176 * A smb_rqst represents a complete request to be issued to a server. It's
177 * formed by a kvec array, followed by an array of pages. Page data is assumed
178 * to start at the beginning of the first page.
181 struct kvec *rq_iov; /* array of kvecs */
182 unsigned int rq_nvec; /* number of kvecs in array */
183 struct page **rq_pages; /* pointer to array of page ptrs */
184 unsigned int rq_offset; /* the offset to the 1st page */
185 unsigned int rq_npages; /* number pages in array */
186 unsigned int rq_pagesz; /* page size to use */
187 unsigned int rq_tailsz; /* length of last page */
191 struct TCP_Server_Info;
195 struct dfs_info3_param;
197 struct smb3_fs_context;
199 struct cifs_readdata;
200 struct cifs_writedata;
201 struct cifs_io_parms;
202 struct cifs_search_info;
203 struct cifsInodeInfo;
204 struct cifs_open_parms;
207 struct smb_version_operations {
208 int (*send_cancel)(struct TCP_Server_Info *, struct smb_rqst *,
209 struct mid_q_entry *);
210 bool (*compare_fids)(struct cifsFileInfo *, struct cifsFileInfo *);
211 /* setup request: allocate mid, sign message */
212 struct mid_q_entry *(*setup_request)(struct cifs_ses *,
213 struct TCP_Server_Info *,
215 /* setup async request: allocate mid, sign message */
216 struct mid_q_entry *(*setup_async_request)(struct TCP_Server_Info *,
218 /* check response: verify signature, map error */
219 int (*check_receive)(struct mid_q_entry *, struct TCP_Server_Info *,
221 void (*add_credits)(struct TCP_Server_Info *server,
222 const struct cifs_credits *credits,
224 void (*set_credits)(struct TCP_Server_Info *, const int);
225 int * (*get_credits_field)(struct TCP_Server_Info *, const int);
226 unsigned int (*get_credits)(struct mid_q_entry *);
227 __u64 (*get_next_mid)(struct TCP_Server_Info *);
228 void (*revert_current_mid)(struct TCP_Server_Info *server,
229 const unsigned int val);
230 /* data offset from read response message */
231 unsigned int (*read_data_offset)(char *);
233 * Data length from read response message
234 * When in_remaining is true, the returned data length is in
235 * message field DataRemaining for out-of-band data read (e.g through
236 * Memory Registration RDMA write in SMBD).
237 * Otherwise, the returned data length is in message field DataLength.
239 unsigned int (*read_data_length)(char *, bool in_remaining);
240 /* map smb to linux error */
241 int (*map_error)(char *, bool);
242 /* find mid corresponding to the response message */
243 struct mid_q_entry * (*find_mid)(struct TCP_Server_Info *, char *);
244 void (*dump_detail)(void *buf, struct TCP_Server_Info *ptcp_info);
245 void (*clear_stats)(struct cifs_tcon *);
246 void (*print_stats)(struct seq_file *m, struct cifs_tcon *);
247 void (*dump_share_caps)(struct seq_file *, struct cifs_tcon *);
248 /* verify the message */
249 int (*check_message)(char *, unsigned int, struct TCP_Server_Info *);
250 bool (*is_oplock_break)(char *, struct TCP_Server_Info *);
251 int (*handle_cancelled_mid)(struct mid_q_entry *, struct TCP_Server_Info *);
252 void (*downgrade_oplock)(struct TCP_Server_Info *server,
253 struct cifsInodeInfo *cinode, __u32 oplock,
254 unsigned int epoch, bool *purge_cache);
255 /* process transaction2 response */
256 bool (*check_trans2)(struct mid_q_entry *, struct TCP_Server_Info *,
258 /* check if we need to negotiate */
259 bool (*need_neg)(struct TCP_Server_Info *);
260 /* negotiate to the server */
261 int (*negotiate)(const unsigned int, struct cifs_ses *);
262 /* set negotiated write size */
263 unsigned int (*negotiate_wsize)(struct cifs_tcon *tcon, struct smb3_fs_context *ctx);
264 /* set negotiated read size */
265 unsigned int (*negotiate_rsize)(struct cifs_tcon *tcon, struct smb3_fs_context *ctx);
266 /* setup smb sessionn */
267 int (*sess_setup)(const unsigned int, struct cifs_ses *,
268 const struct nls_table *);
269 /* close smb session */
270 int (*logoff)(const unsigned int, struct cifs_ses *);
271 /* connect to a server share */
272 int (*tree_connect)(const unsigned int, struct cifs_ses *, const char *,
273 struct cifs_tcon *, const struct nls_table *);
274 /* close tree connecion */
275 int (*tree_disconnect)(const unsigned int, struct cifs_tcon *);
276 /* get DFS referrals */
277 int (*get_dfs_refer)(const unsigned int, struct cifs_ses *,
278 const char *, struct dfs_info3_param **,
279 unsigned int *, const struct nls_table *, int);
280 /* informational QFS call */
281 void (*qfs_tcon)(const unsigned int, struct cifs_tcon *,
282 struct cifs_sb_info *);
283 /* check if a path is accessible or not */
284 int (*is_path_accessible)(const unsigned int, struct cifs_tcon *,
285 struct cifs_sb_info *, const char *);
286 /* query path data from the server */
287 int (*query_path_info)(const unsigned int, struct cifs_tcon *,
288 struct cifs_sb_info *, const char *,
289 FILE_ALL_INFO *, bool *, bool *);
290 /* query file data from the server */
291 int (*query_file_info)(const unsigned int, struct cifs_tcon *,
292 struct cifs_fid *, FILE_ALL_INFO *);
293 /* query reparse tag from srv to determine which type of special file */
294 int (*query_reparse_tag)(const unsigned int xid, struct cifs_tcon *tcon,
295 struct cifs_sb_info *cifs_sb, const char *path,
297 /* get server index number */
298 int (*get_srv_inum)(const unsigned int, struct cifs_tcon *,
299 struct cifs_sb_info *, const char *,
300 u64 *uniqueid, FILE_ALL_INFO *);
301 /* set size by path */
302 int (*set_path_size)(const unsigned int, struct cifs_tcon *,
303 const char *, __u64, struct cifs_sb_info *, bool);
304 /* set size by file handle */
305 int (*set_file_size)(const unsigned int, struct cifs_tcon *,
306 struct cifsFileInfo *, __u64, bool);
308 int (*set_file_info)(struct inode *, const char *, FILE_BASIC_INFO *,
310 int (*set_compression)(const unsigned int, struct cifs_tcon *,
311 struct cifsFileInfo *);
312 /* check if we can send an echo or nor */
313 bool (*can_echo)(struct TCP_Server_Info *);
314 /* send echo request */
315 int (*echo)(struct TCP_Server_Info *);
316 /* create directory */
317 int (*posix_mkdir)(const unsigned int xid, struct inode *inode,
318 umode_t mode, struct cifs_tcon *tcon,
319 const char *full_path,
320 struct cifs_sb_info *cifs_sb);
321 int (*mkdir)(const unsigned int xid, struct inode *inode, umode_t mode,
322 struct cifs_tcon *tcon, const char *name,
323 struct cifs_sb_info *sb);
324 /* set info on created directory */
325 void (*mkdir_setinfo)(struct inode *, const char *,
326 struct cifs_sb_info *, struct cifs_tcon *,
328 /* remove directory */
329 int (*rmdir)(const unsigned int, struct cifs_tcon *, const char *,
330 struct cifs_sb_info *);
332 int (*unlink)(const unsigned int, struct cifs_tcon *, const char *,
333 struct cifs_sb_info *);
334 /* open, rename and delete file */
335 int (*rename_pending_delete)(const char *, struct dentry *,
337 /* send rename request */
338 int (*rename)(const unsigned int, struct cifs_tcon *, const char *,
339 const char *, struct cifs_sb_info *);
340 /* send create hardlink request */
341 int (*create_hardlink)(const unsigned int, struct cifs_tcon *,
342 const char *, const char *,
343 struct cifs_sb_info *);
344 /* query symlink target */
345 int (*query_symlink)(const unsigned int, struct cifs_tcon *,
346 struct cifs_sb_info *, const char *,
348 /* open a file for non-posix mounts */
349 int (*open)(const unsigned int, struct cifs_open_parms *,
350 __u32 *, FILE_ALL_INFO *);
351 /* set fid protocol-specific info */
352 void (*set_fid)(struct cifsFileInfo *, struct cifs_fid *, __u32);
354 void (*close)(const unsigned int, struct cifs_tcon *,
356 /* close a file, returning file attributes and timestamps */
357 void (*close_getattr)(const unsigned int xid, struct cifs_tcon *tcon,
358 struct cifsFileInfo *pfile_info);
359 /* send a flush request to the server */
360 int (*flush)(const unsigned int, struct cifs_tcon *, struct cifs_fid *);
361 /* async read from the server */
362 int (*async_readv)(struct cifs_readdata *);
363 /* async write to the server */
364 int (*async_writev)(struct cifs_writedata *,
365 void (*release)(struct kref *));
366 /* sync read from the server */
367 int (*sync_read)(const unsigned int, struct cifs_fid *,
368 struct cifs_io_parms *, unsigned int *, char **,
370 /* sync write to the server */
371 int (*sync_write)(const unsigned int, struct cifs_fid *,
372 struct cifs_io_parms *, unsigned int *, struct kvec *,
374 /* open dir, start readdir */
375 int (*query_dir_first)(const unsigned int, struct cifs_tcon *,
376 const char *, struct cifs_sb_info *,
377 struct cifs_fid *, __u16,
378 struct cifs_search_info *);
379 /* continue readdir */
380 int (*query_dir_next)(const unsigned int, struct cifs_tcon *,
382 __u16, struct cifs_search_info *srch_inf);
384 int (*close_dir)(const unsigned int, struct cifs_tcon *,
386 /* calculate a size of SMB message */
387 unsigned int (*calc_smb_size)(void *buf, struct TCP_Server_Info *ptcpi);
388 /* check for STATUS_PENDING and process the response if yes */
389 bool (*is_status_pending)(char *buf, struct TCP_Server_Info *server);
390 /* check for STATUS_NETWORK_SESSION_EXPIRED */
391 bool (*is_session_expired)(char *);
392 /* send oplock break response */
393 int (*oplock_response)(struct cifs_tcon *, struct cifs_fid *,
394 struct cifsInodeInfo *);
395 /* query remote filesystem */
396 int (*queryfs)(const unsigned int, struct cifs_tcon *,
397 struct cifs_sb_info *, struct kstatfs *);
398 /* send mandatory brlock to the server */
399 int (*mand_lock)(const unsigned int, struct cifsFileInfo *, __u64,
400 __u64, __u32, int, int, bool);
401 /* unlock range of mandatory locks */
402 int (*mand_unlock_range)(struct cifsFileInfo *, struct file_lock *,
404 /* push brlocks from the cache to the server */
405 int (*push_mand_locks)(struct cifsFileInfo *);
406 /* get lease key of the inode */
407 void (*get_lease_key)(struct inode *, struct cifs_fid *);
408 /* set lease key of the inode */
409 void (*set_lease_key)(struct inode *, struct cifs_fid *);
410 /* generate new lease key */
411 void (*new_lease_key)(struct cifs_fid *);
412 int (*generate_signingkey)(struct cifs_ses *);
413 int (*calc_signature)(struct smb_rqst *, struct TCP_Server_Info *,
414 bool allocate_crypto);
415 int (*set_integrity)(const unsigned int, struct cifs_tcon *tcon,
416 struct cifsFileInfo *src_file);
417 int (*enum_snapshots)(const unsigned int xid, struct cifs_tcon *tcon,
418 struct cifsFileInfo *src_file, void __user *);
419 int (*notify)(const unsigned int xid, struct file *pfile,
421 int (*query_mf_symlink)(unsigned int, struct cifs_tcon *,
422 struct cifs_sb_info *, const unsigned char *,
423 char *, unsigned int *);
424 int (*create_mf_symlink)(unsigned int, struct cifs_tcon *,
425 struct cifs_sb_info *, const unsigned char *,
426 char *, unsigned int *);
427 /* if we can do cache read operations */
428 bool (*is_read_op)(__u32);
429 /* set oplock level for the inode */
430 void (*set_oplock_level)(struct cifsInodeInfo *, __u32, unsigned int,
432 /* create lease context buffer for CREATE request */
433 char * (*create_lease_buf)(u8 *lease_key, u8 oplock);
434 /* parse lease context buffer and return oplock/epoch info */
435 __u8 (*parse_lease_buf)(void *buf, unsigned int *epoch, char *lkey);
436 ssize_t (*copychunk_range)(const unsigned int,
437 struct cifsFileInfo *src_file,
438 struct cifsFileInfo *target_file,
439 u64 src_off, u64 len, u64 dest_off);
440 int (*duplicate_extents)(const unsigned int, struct cifsFileInfo *src,
441 struct cifsFileInfo *target_file, u64 src_off, u64 len,
443 int (*validate_negotiate)(const unsigned int, struct cifs_tcon *);
444 ssize_t (*query_all_EAs)(const unsigned int, struct cifs_tcon *,
445 const unsigned char *, const unsigned char *, char *,
446 size_t, struct cifs_sb_info *);
447 int (*set_EA)(const unsigned int, struct cifs_tcon *, const char *,
448 const char *, const void *, const __u16,
449 const struct nls_table *, struct cifs_sb_info *);
450 struct cifs_ntsd * (*get_acl)(struct cifs_sb_info *, struct inode *,
451 const char *, u32 *, u32);
452 struct cifs_ntsd * (*get_acl_by_fid)(struct cifs_sb_info *,
453 const struct cifs_fid *, u32 *, u32);
454 int (*set_acl)(struct cifs_ntsd *, __u32, struct inode *, const char *,
456 /* writepages retry size */
457 unsigned int (*wp_retry_size)(struct inode *);
458 /* get mtu credits */
459 int (*wait_mtu_credits)(struct TCP_Server_Info *, unsigned int,
460 unsigned int *, struct cifs_credits *);
461 /* adjust previously taken mtu credits to request size */
462 int (*adjust_credits)(struct TCP_Server_Info *server,
463 struct cifs_credits *credits,
464 const unsigned int payload_size);
465 /* check if we need to issue closedir */
466 bool (*dir_needs_close)(struct cifsFileInfo *);
467 long (*fallocate)(struct file *, struct cifs_tcon *, int, loff_t,
469 /* init transform request - used for encryption for now */
470 int (*init_transform_rq)(struct TCP_Server_Info *, int num_rqst,
471 struct smb_rqst *, struct smb_rqst *);
472 int (*is_transform_hdr)(void *buf);
473 int (*receive_transform)(struct TCP_Server_Info *,
474 struct mid_q_entry **, char **, int *);
475 enum securityEnum (*select_sectype)(struct TCP_Server_Info *,
477 int (*next_header)(char *);
478 /* ioctl passthrough for query_info */
479 int (*ioctl_query_info)(const unsigned int xid,
480 struct cifs_tcon *tcon,
481 struct cifs_sb_info *cifs_sb,
482 __le16 *path, int is_dir,
484 /* make unix special files (block, char, fifo, socket) */
485 int (*make_node)(unsigned int xid,
487 struct dentry *dentry,
488 struct cifs_tcon *tcon,
489 const char *full_path,
491 dev_t device_number);
492 /* version specific fiemap implementation */
493 int (*fiemap)(struct cifs_tcon *tcon, struct cifsFileInfo *,
494 struct fiemap_extent_info *, u64, u64);
495 /* version specific llseek implementation */
496 loff_t (*llseek)(struct file *, struct cifs_tcon *, loff_t, int);
497 /* Check for STATUS_IO_TIMEOUT */
498 bool (*is_status_io_timeout)(char *buf);
499 /* Check for STATUS_NETWORK_NAME_DELETED */
500 void (*is_network_name_deleted)(char *buf, struct TCP_Server_Info *srv);
503 struct smb_version_values {
504 char *version_string;
506 __u32 req_capabilities;
507 __u32 large_lock_type;
508 __u32 exclusive_lock_type;
509 __u32 shared_lock_type;
510 __u32 unlock_lock_type;
511 size_t header_preamble_size;
513 size_t max_header_size;
514 size_t read_rsp_size;
516 unsigned int cap_unix;
517 unsigned int cap_nt_find;
518 unsigned int cap_large_files;
519 __u16 signing_enabled;
520 __u16 signing_required;
521 size_t create_lease_size;
524 #define HEADER_SIZE(server) (server->vals->header_size)
525 #define MAX_HEADER_SIZE(server) (server->vals->max_header_size)
528 * CIFS superblock mount flags (mnt_cifs_flags) to consider when
529 * trying to reuse existing superblock for a new mount
531 #define CIFS_MOUNT_MASK (CIFS_MOUNT_NO_PERM | CIFS_MOUNT_SET_UID | \
532 CIFS_MOUNT_SERVER_INUM | CIFS_MOUNT_DIRECT_IO | \
533 CIFS_MOUNT_NO_XATTR | CIFS_MOUNT_MAP_SPECIAL_CHR | \
534 CIFS_MOUNT_MAP_SFM_CHR | \
535 CIFS_MOUNT_UNX_EMUL | CIFS_MOUNT_NO_BRL | \
536 CIFS_MOUNT_CIFS_ACL | CIFS_MOUNT_OVERR_UID | \
537 CIFS_MOUNT_OVERR_GID | CIFS_MOUNT_DYNPERM | \
538 CIFS_MOUNT_NOPOSIXBRL | CIFS_MOUNT_NOSSYNC | \
539 CIFS_MOUNT_FSCACHE | CIFS_MOUNT_MF_SYMLINKS | \
540 CIFS_MOUNT_MULTIUSER | CIFS_MOUNT_STRICT_IO | \
541 CIFS_MOUNT_CIFS_BACKUPUID | CIFS_MOUNT_CIFS_BACKUPGID | \
542 CIFS_MOUNT_UID_FROM_ACL | CIFS_MOUNT_NO_HANDLE_CACHE | \
543 CIFS_MOUNT_NO_DFS | CIFS_MOUNT_MODE_FROM_SID | \
544 CIFS_MOUNT_RO_CACHE | CIFS_MOUNT_RW_CACHE)
547 * Generic VFS superblock mount flags (s_flags) to consider when
548 * trying to reuse existing superblock for a new mount
550 #define CIFS_MS_MASK (SB_RDONLY | SB_MANDLOCK | SB_NOEXEC | SB_NOSUID | \
551 SB_NODEV | SB_SYNCHRONOUS)
553 struct cifs_mnt_data {
554 struct cifs_sb_info *cifs_sb;
555 struct smb3_fs_context *ctx;
559 static inline unsigned int
560 get_rfc1002_length(void *buf)
562 return be32_to_cpu(*((__be32 *)buf)) & 0xffffff;
566 inc_rfc1001_len(void *buf, int count)
568 be32_add_cpu((__be32 *)buf, count);
571 struct TCP_Server_Info {
572 struct list_head tcp_ses_list;
573 struct list_head smb_ses_list;
574 __u64 conn_id; /* connection identifier (useful for debugging) */
575 int srv_count; /* reference counter */
576 /* 15 character server name + 0x20 16th byte indicating type = srv */
577 char server_RFC1001_name[RFC1001_NAME_LEN_WITH_NULL];
578 struct smb_version_operations *ops;
579 struct smb_version_values *vals;
580 /* updates to tcpStatus protected by GlobalMid_Lock */
581 enum statusEnum tcpStatus; /* what we think the status is */
582 char *hostname; /* hostname portion of UNC string */
583 struct socket *ssocket;
584 struct sockaddr_storage dstaddr;
585 struct sockaddr_storage srcaddr; /* locally bind to this IP */
589 wait_queue_head_t response_q;
590 wait_queue_head_t request_q; /* if more than maxmpx to srvr must block*/
591 struct list_head pending_mid_q;
592 bool noblocksnd; /* use blocking sendmsg */
593 bool noautotune; /* do not autotune send buf sizes */
595 unsigned int credits; /* send no more requests at once */
596 unsigned int max_credits; /* can override large 32000 default at mnt */
597 unsigned int in_flight; /* number of requests on the wire to server */
598 unsigned int max_in_flight; /* max number of requests that were on wire */
599 spinlock_t req_lock; /* protect the two values above */
600 struct mutex srv_mutex;
601 struct task_struct *tsk;
602 char server_GUID[16];
604 bool sign; /* is signing enabled on this connection? */
605 bool ignore_signature:1; /* skip validation of signatures in SMB2/3 rsp */
606 bool session_estab; /* mark when very first sess is established */
607 int echo_credits; /* echo reserved slots */
608 int oplock_credits; /* oplock break reserved slots */
609 bool echoes:1; /* enable echoes */
610 __u8 client_guid[SMB2_CLIENT_GUID_SIZE]; /* Client GUID */
611 u16 dialect; /* dialect index that server chose */
612 bool oplocks:1; /* enable oplocks */
613 unsigned int maxReq; /* Clients should submit no more */
614 /* than maxReq distinct unanswered SMBs to the server when using */
615 /* multiplexed reads or writes (for SMB1/CIFS only, not SMB2/SMB3) */
616 unsigned int maxBuf; /* maxBuf specifies the maximum */
617 /* message size the server can send or receive for non-raw SMBs */
618 /* maxBuf is returned by SMB NegotiateProtocol so maxBuf is only 0 */
619 /* when socket is setup (and during reconnect) before NegProt sent */
620 unsigned int max_rw; /* maxRw specifies the maximum */
621 /* message size the server can send or receive for */
622 /* SMB_COM_WRITE_RAW or SMB_COM_READ_RAW. */
623 unsigned int capabilities; /* selective disabling of caps by smb sess */
624 int timeAdj; /* Adjust for difference in server time zone in sec */
625 __u64 CurrentMid; /* multiplex id - rotating counter, protected by GlobalMid_Lock */
626 char cryptkey[CIFS_CRYPTO_KEY_SIZE]; /* used by ntlm, ntlmv2 etc */
627 /* 16th byte of RFC1001 workstation name is always null */
628 char workstation_RFC1001_name[RFC1001_NAME_LEN_WITH_NULL];
629 __u32 sequence_number; /* for signing, protected by srv_mutex */
630 __u32 reconnect_instance; /* incremented on each reconnect */
631 struct session_key session_key;
632 unsigned long lstrp; /* when we got last response from this server */
633 struct cifs_secmech secmech; /* crypto sec mech functs, descriptors */
634 #define CIFS_NEGFLAVOR_LANMAN 0 /* wct == 13, LANMAN */
635 #define CIFS_NEGFLAVOR_UNENCAP 1 /* wct == 17, but no ext_sec */
636 #define CIFS_NEGFLAVOR_EXTENDED 2 /* wct == 17, ext_sec bit set */
637 char negflavor; /* NEGOTIATE response flavor */
638 /* extended security flavors that server supports */
639 bool sec_ntlmssp; /* supports NTLMSSP */
640 bool sec_kerberosu2u; /* supports U2U Kerberos */
641 bool sec_kerberos; /* supports plain Kerberos */
642 bool sec_mskerberos; /* supports legacy MS Kerberos */
643 bool large_buf; /* is current buffer large? */
644 /* use SMBD connection instead of socket */
646 /* point to the SMBD connection if RDMA is used instead of socket */
647 struct smbd_connection *smbd_conn;
648 struct delayed_work echo; /* echo ping workqueue job */
649 char *smallbuf; /* pointer to current "small" buffer */
650 char *bigbuf; /* pointer to current "big" buffer */
651 /* Total size of this PDU. Only valid from cifs_demultiplex_thread */
652 unsigned int pdu_size;
653 unsigned int total_read; /* total amount of data read in this pass */
654 atomic_t in_send; /* requests trying to send */
655 atomic_t num_waiters; /* blocked waiting to get in sendrecv */
656 #ifdef CONFIG_CIFS_FSCACHE
657 struct fscache_cookie *fscache; /* client index cache cookie */
659 #ifdef CONFIG_CIFS_STATS2
660 atomic_t num_cmds[NUMBER_OF_SMB2_COMMANDS]; /* total requests by cmd */
661 atomic_t smb2slowcmd[NUMBER_OF_SMB2_COMMANDS]; /* count resps > 1 sec */
662 __u64 time_per_cmd[NUMBER_OF_SMB2_COMMANDS]; /* total time per cmd */
663 __u32 slowest_cmd[NUMBER_OF_SMB2_COMMANDS];
664 __u32 fastest_cmd[NUMBER_OF_SMB2_COMMANDS];
666 unsigned int max_read;
667 unsigned int max_write;
668 unsigned int min_offload;
669 __le16 compress_algorithm;
670 __u16 signing_algorithm;
672 /* save initital negprot hash */
673 __u8 preauth_sha_hash[SMB2_PREAUTH_HASH_SIZE];
674 bool signing_negotiated; /* true if valid signing context rcvd from server */
675 bool posix_ext_supported;
676 struct delayed_work reconnect; /* reconnect workqueue job */
677 struct mutex reconnect_mutex; /* prevent simultaneous reconnects */
678 unsigned long echo_interval;
681 * Number of targets available for reconnect. The more targets
682 * the more tasks have to wait to let the demultiplex thread
686 bool noblockcnt; /* use non-blocking connect() */
687 bool is_channel; /* if a session channel */
688 #ifdef CONFIG_CIFS_SWN_UPCALL
689 bool use_swn_dstaddr;
690 struct sockaddr_storage swn_dstaddr;
694 struct cifs_credits {
696 unsigned int instance;
699 static inline unsigned int
700 in_flight(struct TCP_Server_Info *server)
703 spin_lock(&server->req_lock);
704 num = server->in_flight;
705 spin_unlock(&server->req_lock);
710 has_credits(struct TCP_Server_Info *server, int *credits, int num_credits)
713 spin_lock(&server->req_lock);
715 spin_unlock(&server->req_lock);
716 return num >= num_credits;
720 add_credits(struct TCP_Server_Info *server, const struct cifs_credits *credits,
723 server->ops->add_credits(server, credits, optype);
727 add_credits_and_wake_if(struct TCP_Server_Info *server,
728 const struct cifs_credits *credits, const int optype)
730 if (credits->value) {
731 server->ops->add_credits(server, credits, optype);
732 wake_up(&server->request_q);
737 set_credits(struct TCP_Server_Info *server, const int val)
739 server->ops->set_credits(server, val);
743 adjust_credits(struct TCP_Server_Info *server, struct cifs_credits *credits,
744 const unsigned int payload_size)
746 return server->ops->adjust_credits ?
747 server->ops->adjust_credits(server, credits, payload_size) : 0;
751 get_next_mid64(struct TCP_Server_Info *server)
753 return cpu_to_le64(server->ops->get_next_mid(server));
757 get_next_mid(struct TCP_Server_Info *server)
759 __u16 mid = server->ops->get_next_mid(server);
761 * The value in the SMB header should be little endian for easy
762 * on-the-wire decoding.
764 return cpu_to_le16(mid);
768 revert_current_mid(struct TCP_Server_Info *server, const unsigned int val)
770 if (server->ops->revert_current_mid)
771 server->ops->revert_current_mid(server, val);
775 revert_current_mid_from_hdr(struct TCP_Server_Info *server,
776 const struct smb2_sync_hdr *shdr)
778 unsigned int num = le16_to_cpu(shdr->CreditCharge);
780 return revert_current_mid(server, num > 0 ? num : 1);
784 get_mid(const struct smb_hdr *smb)
786 return le16_to_cpu(smb->Mid);
790 compare_mid(__u16 mid, const struct smb_hdr *smb)
792 return mid == le16_to_cpu(smb->Mid);
796 * When the server supports very large reads and writes via POSIX extensions,
797 * we can allow up to 2^24-1, minus the size of a READ/WRITE_AND_X header, not
798 * including the RFC1001 length.
800 * Note that this might make for "interesting" allocation problems during
801 * writeback however as we have to allocate an array of pointers for the
802 * pages. A 16M write means ~32kb page array with PAGE_SIZE == 4096.
804 * For reads, there is a similar problem as we need to allocate an array
805 * of kvecs to handle the receive, though that should only need to be done
808 #define CIFS_MAX_WSIZE ((1<<24) - 1 - sizeof(WRITE_REQ) + 4)
809 #define CIFS_MAX_RSIZE ((1<<24) - sizeof(READ_RSP) + 4)
812 * When the server doesn't allow large posix writes, only allow a rsize/wsize
813 * of 2^17-1 minus the size of the call header. That allows for a read or
814 * write up to the maximum size described by RFC1002.
816 #define CIFS_MAX_RFC1002_WSIZE ((1<<17) - 1 - sizeof(WRITE_REQ) + 4)
817 #define CIFS_MAX_RFC1002_RSIZE ((1<<17) - 1 - sizeof(READ_RSP) + 4)
820 * The default wsize is 1M. find_get_pages seems to return a maximum of 256
821 * pages in a single call. With PAGE_SIZE == 4k, this means we can fill
822 * a single wsize request with a single call.
824 #define CIFS_DEFAULT_IOSIZE (1024 * 1024)
825 #define SMB3_DEFAULT_IOSIZE (4 * 1024 * 1024)
828 * Windows only supports a max of 60kb reads and 65535 byte writes. Default to
829 * those values when posix extensions aren't in force. In actuality here, we
830 * use 65536 to allow for a write that is a multiple of 4k. Most servers seem
831 * to be ok with the extra byte even though Windows doesn't send writes that
836 * https://blogs.msdn.com/b/openspecification/archive/2009/04/10/smb-maximum-transmit-buffer-size-and-performance-tuning.aspx
838 #define CIFS_DEFAULT_NON_POSIX_RSIZE (60 * 1024)
839 #define CIFS_DEFAULT_NON_POSIX_WSIZE (65536)
842 * Macros to allow the TCP_Server_Info->net field and related code to drop out
843 * when CONFIG_NET_NS isn't set.
848 static inline struct net *cifs_net_ns(struct TCP_Server_Info *srv)
853 static inline void cifs_set_net_ns(struct TCP_Server_Info *srv, struct net *net)
860 static inline struct net *cifs_net_ns(struct TCP_Server_Info *srv)
865 static inline void cifs_set_net_ns(struct TCP_Server_Info *srv, struct net *net)
871 struct cifs_server_iface {
873 unsigned int rdma_capable : 1;
874 unsigned int rss_capable : 1;
875 struct sockaddr_storage sockaddr;
879 struct TCP_Server_Info *server;
880 __u8 signkey[SMB3_SIGN_KEY_SIZE];
884 * Session structure. One of these for each uid session with a particular host
887 struct list_head smb_ses_list;
888 struct list_head tcon_list;
889 struct cifs_tcon *tcon_ipc;
890 struct mutex session_mutex;
891 struct TCP_Server_Info *server; /* pointer to server info */
892 int ses_count; /* reference counter */
893 enum statusEnum status; /* updates protected by GlobalMid_Lock */
894 unsigned overrideSecFlg; /* if non-zero override global sec flags */
895 char *serverOS; /* name of operating system underlying server */
896 char *serverNOS; /* name of network operating system of server */
897 char *serverDomain; /* security realm of server */
898 __u64 Suid; /* remote smb uid */
899 kuid_t linux_uid; /* overriding owner of files on the mount */
900 kuid_t cred_uid; /* owner of credentials */
901 unsigned int capabilities;
902 char ip_addr[INET6_ADDRSTRLEN + 1]; /* Max ipv6 (or v4) addr string len */
903 char *user_name; /* must not be null except during init of sess
904 and after mount option parsing we fill it */
907 struct session_key auth_key;
908 struct ntlmssp_auth *ntlmssp; /* ciphertext, flags, server challenge */
909 enum securityEnum sectype; /* what security flavor was specified? */
910 bool sign; /* is signing required? */
911 bool need_reconnect:1; /* connection reset, uid now invalid */
913 bool binding:1; /* are we binding the session? */
915 __u8 smb3signingkey[SMB3_SIGN_KEY_SIZE];
916 __u8 smb3encryptionkey[SMB3_ENC_DEC_KEY_SIZE];
917 __u8 smb3decryptionkey[SMB3_ENC_DEC_KEY_SIZE];
918 __u8 preauth_sha_hash[SMB2_PREAUTH_HASH_SIZE];
920 __u8 binding_preauth_sha_hash[SMB2_PREAUTH_HASH_SIZE];
923 * Network interfaces available on the server this session is
926 * Other channels can be opened by connecting and binding this
927 * session to interfaces from this list.
929 * iface_lock should be taken when accessing any of these fields
931 spinlock_t iface_lock;
932 struct cifs_server_iface *iface_list;
934 unsigned long iface_last_update; /* jiffies */
936 #define CIFS_MAX_CHANNELS 16
937 struct cifs_chan chans[CIFS_MAX_CHANNELS];
938 struct cifs_chan *binding_chan;
941 atomic_t chan_seq; /* round robin state */
945 * When binding a new channel, we need to access the channel which isn't fully
950 struct cifs_chan *cifs_ses_binding_channel(struct cifs_ses *ses)
953 return ses->binding_chan;
959 * Returns the server pointer of the session. When binding a new
960 * channel this returns the last channel which isn't fully established
963 * This function should be use for negprot/sess.setup codepaths. For
964 * the other requests see cifs_pick_channel().
967 struct TCP_Server_Info *cifs_ses_server(struct cifs_ses *ses)
970 return ses->binding_chan->server;
976 cap_unix(struct cifs_ses *ses)
978 return ses->server->vals->cap_unix & ses->capabilities;
982 bool is_valid:1; /* Do we have a useable root fid */
983 bool file_all_info_is_valid:1;
985 unsigned long time; /* jiffies of when lease was taken */
986 struct kref refcount;
987 struct cifs_fid *fid;
988 struct mutex fid_mutex;
989 struct cifs_tcon *tcon;
990 struct dentry *dentry;
991 struct work_struct lease_break;
992 struct smb2_file_all_info file_all_info;
996 * there is one of these for each connection to a resource on a particular
1000 struct list_head tcon_list;
1002 struct list_head rlist; /* reconnect list */
1003 atomic_t num_local_opens; /* num of all opens including disconnected */
1004 atomic_t num_remote_opens; /* num of all network opens on server */
1005 struct list_head openFileList;
1006 spinlock_t open_file_lock; /* protects list above */
1007 struct cifs_ses *ses; /* pointer to session associated with */
1008 char treeName[MAX_TREE_SIZE + 1]; /* UNC name of resource in ASCII */
1009 char *nativeFileSystem;
1010 char *password; /* for share-level security */
1011 __u32 tid; /* The 4 byte tree id */
1012 __u16 Flags; /* optional support bits */
1013 enum statusEnum tidStatus;
1014 atomic_t num_smbs_sent;
1017 atomic_t num_writes;
1019 atomic_t num_flushes;
1020 atomic_t num_oplock_brks;
1022 atomic_t num_closes;
1023 atomic_t num_deletes;
1024 atomic_t num_mkdirs;
1025 atomic_t num_posixopens;
1026 atomic_t num_posixmkdirs;
1027 atomic_t num_rmdirs;
1028 atomic_t num_renames;
1029 atomic_t num_t2renames;
1030 atomic_t num_ffirst;
1032 atomic_t num_fclose;
1033 atomic_t num_hardlinks;
1034 atomic_t num_symlinks;
1036 atomic_t num_acl_get;
1037 atomic_t num_acl_set;
1040 atomic_t smb2_com_sent[NUMBER_OF_SMB2_COMMANDS];
1041 atomic_t smb2_com_failed[NUMBER_OF_SMB2_COMMANDS];
1045 __u64 bytes_written;
1046 spinlock_t stat_lock; /* protects the two fields above */
1047 FILE_SYSTEM_DEVICE_INFO fsDevInfo;
1048 FILE_SYSTEM_ATTRIBUTE_INFO fsAttrInfo; /* ok if fs name truncated */
1049 FILE_SYSTEM_UNIX_INFO fsUnixInfo;
1050 bool ipc:1; /* set if connection to IPC$ share (always also pipe) */
1051 bool pipe:1; /* set if connection to pipe share */
1052 bool print:1; /* set if connection to printer share */
1055 bool nohandlecache:1; /* if strange server resource prob can turn off */
1057 bool seal:1; /* transport encryption for this mounted share */
1058 bool unix_ext:1; /* if false disable Linux extensions to CIFS protocol
1059 for this mount even if server would support */
1060 bool posix_extensions; /* if true SMB3.11 posix extensions enabled */
1061 bool local_lease:1; /* check leases (only) on local system not remote */
1062 bool broken_posix_open; /* e.g. Samba server versions < 3.3.2, 3.2.9 */
1063 bool broken_sparse_sup; /* if server or share does not support sparse */
1064 bool need_reconnect:1; /* connection reset, tid now invalid */
1065 bool need_reopen_files:1; /* need to reopen tcon file handles */
1066 bool use_resilient:1; /* use resilient instead of durable handles */
1067 bool use_persistent:1; /* use persistent instead of durable handles */
1068 bool no_lease:1; /* Do not request leases on files or directories */
1069 bool use_witness:1; /* use witness protocol */
1070 __le32 capabilities;
1072 __u32 maximal_access;
1073 __u32 vol_serial_number;
1074 __le64 vol_create_time;
1075 __u64 snapshot_time; /* for timewarp tokens - timestamp of snapshot */
1076 __u32 handle_timeout; /* persistent and durable handle timeout in ms */
1077 __u32 ss_flags; /* sector size flags */
1078 __u32 perf_sector_size; /* best sector size for perf */
1080 __u32 max_bytes_chunk;
1081 __u32 max_bytes_copy;
1082 #ifdef CONFIG_CIFS_FSCACHE
1083 u64 resource_id; /* server resource id */
1084 struct fscache_cookie *fscache; /* cookie for share */
1086 struct list_head pending_opens; /* list of incomplete opens */
1087 struct cached_fid crfid; /* Cached root fid */
1088 /* BB add field for back pointer to sb struct(s)? */
1089 #ifdef CONFIG_CIFS_DFS_UPCALL
1090 char *dfs_path; /* canonical DFS path */
1091 struct list_head ulist; /* cache update list */
1096 * This is a refcounted and timestamped container for a tcon pointer. The
1097 * container holds a tcon reference. It is considered safe to free one of
1098 * these when the tl_count goes to 0. The tl_time is the time of the last
1099 * "get" on the container.
1102 struct rb_node tl_rbnode;
1104 unsigned long tl_flags;
1105 #define TCON_LINK_MASTER 0
1106 #define TCON_LINK_PENDING 1
1107 #define TCON_LINK_IN_TREE 2
1108 unsigned long tl_time;
1110 struct cifs_tcon *tl_tcon;
1113 extern struct tcon_link *cifs_sb_tlink(struct cifs_sb_info *cifs_sb);
1114 extern void smb3_free_compound_rqst(int num_rqst, struct smb_rqst *rqst);
1116 static inline struct cifs_tcon *
1117 tlink_tcon(struct tcon_link *tlink)
1119 return tlink->tl_tcon;
1122 static inline struct tcon_link *
1123 cifs_sb_master_tlink(struct cifs_sb_info *cifs_sb)
1125 return cifs_sb->master_tlink;
1128 extern void cifs_put_tlink(struct tcon_link *tlink);
1130 static inline struct tcon_link *
1131 cifs_get_tlink(struct tcon_link *tlink)
1133 if (tlink && !IS_ERR(tlink))
1134 atomic_inc(&tlink->tl_count);
1138 /* This function is always expected to succeed */
1139 extern struct cifs_tcon *cifs_sb_master_tcon(struct cifs_sb_info *cifs_sb);
1141 #define CIFS_OPLOCK_NO_CHANGE 0xfe
1143 struct cifs_pending_open {
1144 struct list_head olist;
1145 struct tcon_link *tlink;
1150 struct cifs_deferred_close {
1151 struct list_head dlist;
1152 struct tcon_link *tlink;
1154 __u64 persistent_fid;
1159 * This info hangs off the cifsFileInfo structure, pointed to by llist.
1160 * This is used to track byte stream locks on the file
1162 struct cifsLockInfo {
1163 struct list_head llist; /* pointer to next cifsLockInfo */
1164 struct list_head blist; /* pointer to locks blocked on this */
1165 wait_queue_head_t block_q;
1174 * One of these for each open instance of a file
1176 struct cifs_search_info {
1177 loff_t index_of_last_entry;
1178 __u16 entries_in_buffer;
1181 char *ntwrk_buf_start;
1182 char *srch_entries_start;
1184 const char *presume_name;
1185 unsigned int resume_name_len;
1189 bool smallBuf:1; /* so we know which buf_release function to call */
1192 #define ACL_NO_MODE ((umode_t)(-1))
1193 struct cifs_open_parms {
1194 struct cifs_tcon *tcon;
1195 struct cifs_sb_info *cifs_sb;
1200 struct cifs_fid *fid;
1207 __u64 persistent_fid; /* persist file id for smb2 */
1208 __u64 volatile_fid; /* volatile file id for smb2 */
1209 __u8 lease_key[SMB2_LEASE_KEY_SIZE]; /* lease key for smb2 */
1210 __u8 create_guid[16];
1212 struct cifs_pending_open *pending_open;
1214 #ifdef CONFIG_CIFS_DEBUG2
1216 #endif /* CIFS_DEBUG2 */
1220 struct cifs_fid_locks {
1221 struct list_head llist;
1222 struct cifsFileInfo *cfile; /* fid that owns locks */
1223 struct list_head locks; /* locks held by fid above */
1226 struct cifsFileInfo {
1227 /* following two lists are protected by tcon->open_file_lock */
1228 struct list_head tlist; /* pointer to next fid owned by tcon */
1229 struct list_head flist; /* next fid (file instance) for this inode */
1230 /* lock list below protected by cifsi->lock_sem */
1231 struct cifs_fid_locks *llist; /* brlocks held by this fid */
1232 kuid_t uid; /* allows finding which FileInfo structure */
1233 __u32 pid; /* process id who opened file */
1234 struct cifs_fid fid; /* file id from remote */
1235 struct list_head rlist; /* reconnect list */
1236 /* BB add lock scope info here if needed */ ;
1237 /* lock scope id (0 if none) */
1238 struct dentry *dentry;
1239 struct tcon_link *tlink;
1240 unsigned int f_flags;
1241 bool invalidHandle:1; /* file closed via session abend */
1243 bool oplock_break_cancelled:1;
1244 unsigned int oplock_epoch; /* epoch from the lease break */
1245 __u32 oplock_level; /* oplock/lease level from the lease break */
1247 spinlock_t file_info_lock; /* protects four flag/count fields above */
1248 struct mutex fh_mutex; /* prevents reopen race after dead ses*/
1249 struct cifs_search_info srch_inf;
1250 struct work_struct oplock_break; /* work for oplock breaks */
1251 struct work_struct put; /* work for the final part of _put */
1252 struct delayed_work deferred;
1253 bool deferred_close_scheduled; /* Flag to indicate close is scheduled */
1256 struct cifs_io_parms {
1258 __u64 persistent_fid; /* persist file id for smb2 */
1259 __u64 volatile_fid; /* volatile file id for smb2 */
1262 unsigned int length;
1263 struct cifs_tcon *tcon;
1264 struct TCP_Server_Info *server;
1267 struct cifs_aio_ctx {
1268 struct kref refcount;
1269 struct list_head list;
1270 struct mutex aio_mutex;
1271 struct completion done;
1272 struct iov_iter iter;
1274 struct cifsFileInfo *cfile;
1277 unsigned int npages;
1280 unsigned int total_len;
1283 * Indicates if this aio_ctx is for direct_io,
1284 * If yes, iter is a copy of the user passed iov_iter
1289 /* asynchronous read support */
1290 struct cifs_readdata {
1291 struct kref refcount;
1292 struct list_head list;
1293 struct completion done;
1294 struct cifsFileInfo *cfile;
1295 struct address_space *mapping;
1296 struct cifs_aio_ctx *ctx;
1299 unsigned int got_bytes;
1302 struct work_struct work;
1303 int (*read_into_pages)(struct TCP_Server_Info *server,
1304 struct cifs_readdata *rdata,
1306 int (*copy_into_pages)(struct TCP_Server_Info *server,
1307 struct cifs_readdata *rdata,
1308 struct iov_iter *iter);
1310 struct TCP_Server_Info *server;
1311 #ifdef CONFIG_CIFS_SMB_DIRECT
1314 unsigned int pagesz;
1315 unsigned int page_offset;
1316 unsigned int tailsz;
1317 struct cifs_credits credits;
1318 unsigned int nr_pages;
1319 struct page **pages;
1322 /* asynchronous write support */
1323 struct cifs_writedata {
1324 struct kref refcount;
1325 struct list_head list;
1326 struct completion done;
1327 enum writeback_sync_modes sync_mode;
1328 struct work_struct work;
1329 struct cifsFileInfo *cfile;
1330 struct cifs_aio_ctx *ctx;
1335 struct TCP_Server_Info *server;
1336 #ifdef CONFIG_CIFS_SMB_DIRECT
1339 unsigned int pagesz;
1340 unsigned int page_offset;
1341 unsigned int tailsz;
1342 struct cifs_credits credits;
1343 unsigned int nr_pages;
1344 struct page **pages;
1348 * Take a reference on the file private data. Must be called with
1349 * cfile->file_info_lock held.
1352 cifsFileInfo_get_locked(struct cifsFileInfo *cifs_file)
1357 struct cifsFileInfo *cifsFileInfo_get(struct cifsFileInfo *cifs_file);
1358 void _cifsFileInfo_put(struct cifsFileInfo *cifs_file, bool wait_oplock_hdlr,
1360 void cifsFileInfo_put(struct cifsFileInfo *cifs_file);
1362 #define CIFS_CACHE_READ_FLG 1
1363 #define CIFS_CACHE_HANDLE_FLG 2
1364 #define CIFS_CACHE_RH_FLG (CIFS_CACHE_READ_FLG | CIFS_CACHE_HANDLE_FLG)
1365 #define CIFS_CACHE_WRITE_FLG 4
1366 #define CIFS_CACHE_RW_FLG (CIFS_CACHE_READ_FLG | CIFS_CACHE_WRITE_FLG)
1367 #define CIFS_CACHE_RHW_FLG (CIFS_CACHE_RW_FLG | CIFS_CACHE_HANDLE_FLG)
1369 #define CIFS_CACHE_READ(cinode) ((cinode->oplock & CIFS_CACHE_READ_FLG) || (CIFS_SB(cinode->vfs_inode.i_sb)->mnt_cifs_flags & CIFS_MOUNT_RO_CACHE))
1370 #define CIFS_CACHE_HANDLE(cinode) (cinode->oplock & CIFS_CACHE_HANDLE_FLG)
1371 #define CIFS_CACHE_WRITE(cinode) ((cinode->oplock & CIFS_CACHE_WRITE_FLG) || (CIFS_SB(cinode->vfs_inode.i_sb)->mnt_cifs_flags & CIFS_MOUNT_RW_CACHE))
1374 * One of these for each file inode
1377 struct cifsInodeInfo {
1378 bool can_cache_brlcks;
1379 struct list_head llist; /* locks helb by this inode */
1381 * NOTE: Some code paths call down_read(lock_sem) twice, so
1382 * we must always use cifs_down_write() instead of down_write()
1383 * for this semaphore to avoid deadlocks.
1385 struct rw_semaphore lock_sem; /* protect the fields above */
1386 /* BB add in lists for dirty pages i.e. write caching info for oplock */
1387 struct list_head openFileList;
1388 spinlock_t open_file_lock; /* protects openFileList */
1389 __u32 cifsAttrs; /* e.g. DOS archive bit, sparse, compressed, system */
1390 unsigned int oplock; /* oplock/lease level we have */
1391 unsigned int epoch; /* used to track lease state changes */
1392 #define CIFS_INODE_PENDING_OPLOCK_BREAK (0) /* oplock break in progress */
1393 #define CIFS_INODE_PENDING_WRITERS (1) /* Writes in progress */
1394 #define CIFS_INODE_FLAG_UNUSED (2) /* Unused flag */
1395 #define CIFS_INO_DELETE_PENDING (3) /* delete pending on server */
1396 #define CIFS_INO_INVALID_MAPPING (4) /* pagecache is invalid */
1397 #define CIFS_INO_LOCK (5) /* lock bit for synchronization */
1398 #define CIFS_INO_MODIFIED_ATTR (6) /* Indicate change in mtime/ctime */
1399 unsigned long flags;
1400 spinlock_t writers_lock;
1401 unsigned int writers; /* Number of writers on this inode */
1402 unsigned long time; /* jiffies of last update of inode */
1403 u64 server_eof; /* current file size on server -- protected by i_lock */
1404 u64 uniqueid; /* server inode number */
1405 u64 createtime; /* creation time on server */
1406 __u8 lease_key[SMB2_LEASE_KEY_SIZE]; /* lease key for this inode */
1407 #ifdef CONFIG_CIFS_FSCACHE
1408 struct fscache_cookie *fscache;
1410 struct inode vfs_inode;
1411 struct list_head deferred_closes; /* list of deferred closes */
1412 spinlock_t deferred_lock; /* protection on deferred list */
1413 bool lease_granted; /* Flag to indicate whether lease or oplock is granted. */
1416 static inline struct cifsInodeInfo *
1417 CIFS_I(struct inode *inode)
1419 return container_of(inode, struct cifsInodeInfo, vfs_inode);
1422 static inline struct cifs_sb_info *
1423 CIFS_SB(struct super_block *sb)
1425 return sb->s_fs_info;
1428 static inline struct cifs_sb_info *
1429 CIFS_FILE_SB(struct file *file)
1431 return CIFS_SB(file_inode(file)->i_sb);
1434 static inline char CIFS_DIR_SEP(const struct cifs_sb_info *cifs_sb)
1436 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_POSIX_PATHS)
1443 convert_delimiter(char *path, char delim)
1445 char old_delim, *pos;
1453 while ((pos = strchr(pos, old_delim)))
1457 #define cifs_stats_inc atomic_inc
1459 static inline void cifs_stats_bytes_written(struct cifs_tcon *tcon,
1463 spin_lock(&tcon->stat_lock);
1464 tcon->bytes_written += bytes;
1465 spin_unlock(&tcon->stat_lock);
1469 static inline void cifs_stats_bytes_read(struct cifs_tcon *tcon,
1472 spin_lock(&tcon->stat_lock);
1473 tcon->bytes_read += bytes;
1474 spin_unlock(&tcon->stat_lock);
1479 * This is the prototype for the mid receive function. This function is for
1480 * receiving the rest of the SMB frame, starting with the WordCount (which is
1481 * just after the MID in struct smb_hdr). Note:
1483 * - This will be called by cifsd, with no locks held.
1484 * - The mid will still be on the pending_mid_q.
1485 * - mid->resp_buf will point to the current buffer.
1487 * Returns zero on a successful receive, or an error. The receive state in
1488 * the TCP_Server_Info will also be updated.
1490 typedef int (mid_receive_t)(struct TCP_Server_Info *server,
1491 struct mid_q_entry *mid);
1494 * This is the prototype for the mid callback function. This is called once the
1495 * mid has been received off of the socket. When creating one, take special
1496 * care to avoid deadlocks. Things to bear in mind:
1498 * - it will be called by cifsd, with no locks held
1499 * - the mid will be removed from any lists
1501 typedef void (mid_callback_t)(struct mid_q_entry *mid);
1504 * This is the protopyte for mid handle function. This is called once the mid
1505 * has been recognized after decryption of the message.
1507 typedef int (mid_handle_t)(struct TCP_Server_Info *server,
1508 struct mid_q_entry *mid);
1510 /* one of these for every pending CIFS request to the server */
1511 struct mid_q_entry {
1512 struct list_head qhead; /* mids waiting on reply from this server */
1513 struct kref refcount;
1514 struct TCP_Server_Info *server; /* server corresponding to this mid */
1515 __u64 mid; /* multiplex id */
1516 __u16 credits; /* number of credits consumed by this mid */
1517 __u16 credits_received; /* number of credits from the response */
1518 __u32 pid; /* process id */
1519 __u32 sequence_number; /* for CIFS signing */
1520 unsigned long when_alloc; /* when mid was created */
1521 #ifdef CONFIG_CIFS_STATS2
1522 unsigned long when_sent; /* time when smb send finished */
1523 unsigned long when_received; /* when demux complete (taken off wire) */
1525 mid_receive_t *receive; /* call receive callback */
1526 mid_callback_t *callback; /* call completion callback */
1527 mid_handle_t *handle; /* call handle mid callback */
1528 void *callback_data; /* general purpose pointer for callback */
1529 struct task_struct *creator;
1530 void *resp_buf; /* pointer to received SMB header */
1531 unsigned int resp_buf_size;
1532 int mid_state; /* wish this were enum but can not pass to wait_event */
1533 unsigned int mid_flags;
1534 __le16 command; /* smb command code */
1535 unsigned int optype; /* operation type */
1536 bool large_buf:1; /* if valid response, is pointer to large buf */
1537 bool multiRsp:1; /* multiple trans2 responses for one request */
1538 bool multiEnd:1; /* both received */
1539 bool decrypted:1; /* decrypted entry */
1542 struct close_cancelled_open {
1543 struct cifs_fid fid;
1544 struct cifs_tcon *tcon;
1545 struct work_struct work;
1550 /* Make code in transport.c a little cleaner by moving
1551 update of optional stats into function below */
1552 static inline void cifs_in_send_inc(struct TCP_Server_Info *server)
1554 atomic_inc(&server->in_send);
1557 static inline void cifs_in_send_dec(struct TCP_Server_Info *server)
1559 atomic_dec(&server->in_send);
1562 static inline void cifs_num_waiters_inc(struct TCP_Server_Info *server)
1564 atomic_inc(&server->num_waiters);
1567 static inline void cifs_num_waiters_dec(struct TCP_Server_Info *server)
1569 atomic_dec(&server->num_waiters);
1572 #ifdef CONFIG_CIFS_STATS2
1573 static inline void cifs_save_when_sent(struct mid_q_entry *mid)
1575 mid->when_sent = jiffies;
1578 static inline void cifs_save_when_sent(struct mid_q_entry *mid)
1583 /* for pending dnotify requests */
1584 struct dir_notify_req {
1585 struct list_head lhead;
1592 __u32 filter; /* CompletionFilter (for multishot) */
1597 struct dfs_info3_param {
1598 int flags; /* DFSREF_REFERRAL_SERVER, DFSREF_STORAGE_SERVER*/
1608 * common struct for holding inode info when searching for or updating an
1609 * inode with new info
1612 #define CIFS_FATTR_DFS_REFERRAL 0x1
1613 #define CIFS_FATTR_DELETE_PENDING 0x2
1614 #define CIFS_FATTR_NEED_REVAL 0x4
1615 #define CIFS_FATTR_INO_COLLISION 0x8
1616 #define CIFS_FATTR_UNKNOWN_NLINK 0x10
1617 #define CIFS_FATTR_FAKE_ROOT_INO 0x20
1630 unsigned int cf_nlink;
1631 unsigned int cf_dtype;
1632 struct timespec64 cf_atime;
1633 struct timespec64 cf_mtime;
1634 struct timespec64 cf_ctime;
1638 static inline void free_dfs_info_param(struct dfs_info3_param *param)
1641 kfree(param->path_name);
1642 kfree(param->node_name);
1646 static inline void free_dfs_info_array(struct dfs_info3_param *param,
1647 int number_of_items)
1650 if ((number_of_items == 0) || (param == NULL))
1652 for (i = 0; i < number_of_items; i++) {
1653 kfree(param[i].path_name);
1654 kfree(param[i].node_name);
1659 static inline bool is_interrupt_error(int error)
1664 case -ERESTARTNOHAND:
1665 case -ERESTARTNOINTR:
1671 static inline bool is_retryable_error(int error)
1673 if (is_interrupt_error(error) || error == -EAGAIN)
1679 /* cifs_get_writable_file() flags */
1680 #define FIND_WR_ANY 0
1681 #define FIND_WR_FSUID_ONLY 1
1682 #define FIND_WR_WITH_DELETE 2
1685 #define MID_REQUEST_ALLOCATED 1
1686 #define MID_REQUEST_SUBMITTED 2
1687 #define MID_RESPONSE_RECEIVED 4
1688 #define MID_RETRY_NEEDED 8 /* session closed while this request out */
1689 #define MID_RESPONSE_MALFORMED 0x10
1690 #define MID_SHUTDOWN 0x20
1693 #define MID_WAIT_CANCELLED 1 /* Cancelled while waiting for response */
1694 #define MID_DELETED 2 /* Mid has been dequeued/deleted */
1696 /* Types of response buffer returned from SendReceive2 */
1697 #define CIFS_NO_BUFFER 0 /* Response buffer not returned */
1698 #define CIFS_SMALL_BUFFER 1
1699 #define CIFS_LARGE_BUFFER 2
1700 #define CIFS_IOVEC 4 /* array of response buffers */
1702 /* Type of Request to SendReceive2 */
1703 #define CIFS_BLOCKING_OP 1 /* operation can block */
1704 #define CIFS_NON_BLOCKING 2 /* do not block waiting for credits */
1705 #define CIFS_TIMEOUT_MASK 0x003 /* only one of above set in req */
1706 #define CIFS_LOG_ERROR 0x010 /* log NT STATUS if non-zero */
1707 #define CIFS_LARGE_BUF_OP 0x020 /* large request buffer */
1708 #define CIFS_NO_RSP_BUF 0x040 /* no response buffer required */
1710 /* Type of request operation */
1711 #define CIFS_ECHO_OP 0x080 /* echo request */
1712 #define CIFS_OBREAK_OP 0x0100 /* oplock break request */
1713 #define CIFS_NEG_OP 0x0200 /* negotiate request */
1714 #define CIFS_CP_CREATE_CLOSE_OP 0x0400 /* compound create+close request */
1715 /* Lower bitmask values are reserved by others below. */
1716 #define CIFS_SESS_OP 0x2000 /* session setup request */
1717 #define CIFS_OP_MASK 0x2780 /* mask request type */
1719 #define CIFS_HAS_CREDITS 0x0400 /* already has credits */
1720 #define CIFS_TRANSFORM_REQ 0x0800 /* transform request before sending */
1721 #define CIFS_NO_SRV_RSP 0x1000 /* there is no server response */
1723 /* Security Flags: indicate type of session setup needed */
1724 #define CIFSSEC_MAY_SIGN 0x00001
1725 #define CIFSSEC_MAY_NTLM 0x00002
1726 #define CIFSSEC_MAY_NTLMV2 0x00004
1727 #define CIFSSEC_MAY_KRB5 0x00008
1728 #ifdef CONFIG_CIFS_WEAK_PW_HASH
1729 #define CIFSSEC_MAY_LANMAN 0x00010
1730 #define CIFSSEC_MAY_PLNTXT 0x00020
1732 #define CIFSSEC_MAY_LANMAN 0
1733 #define CIFSSEC_MAY_PLNTXT 0
1734 #endif /* weak passwords */
1735 #define CIFSSEC_MAY_SEAL 0x00040 /* not supported yet */
1736 #define CIFSSEC_MAY_NTLMSSP 0x00080 /* raw ntlmssp with ntlmv2 */
1738 #define CIFSSEC_MUST_SIGN 0x01001
1739 /* note that only one of the following can be set so the
1740 result of setting MUST flags more than once will be to
1741 require use of the stronger protocol */
1742 #define CIFSSEC_MUST_NTLM 0x02002
1743 #define CIFSSEC_MUST_NTLMV2 0x04004
1744 #define CIFSSEC_MUST_KRB5 0x08008
1745 #ifdef CONFIG_CIFS_WEAK_PW_HASH
1746 #define CIFSSEC_MUST_LANMAN 0x10010
1747 #define CIFSSEC_MUST_PLNTXT 0x20020
1748 #ifdef CONFIG_CIFS_UPCALL
1749 #define CIFSSEC_MASK 0xBF0BF /* allows weak security but also krb5 */
1751 #define CIFSSEC_MASK 0xB70B7 /* current flags supported if weak */
1753 #else /* do not allow weak pw hash */
1754 #define CIFSSEC_MUST_LANMAN 0
1755 #define CIFSSEC_MUST_PLNTXT 0
1756 #ifdef CONFIG_CIFS_UPCALL
1757 #define CIFSSEC_MASK 0x8F08F /* flags supported if no weak allowed */
1759 #define CIFSSEC_MASK 0x87087 /* flags supported if no weak allowed */
1761 #endif /* WEAK_PW_HASH */
1762 #define CIFSSEC_MUST_SEAL 0x40040 /* not supported yet */
1763 #define CIFSSEC_MUST_NTLMSSP 0x80080 /* raw ntlmssp with ntlmv2 */
1765 #define CIFSSEC_DEF (CIFSSEC_MAY_SIGN | CIFSSEC_MAY_NTLMV2 | CIFSSEC_MAY_NTLMSSP)
1766 #define CIFSSEC_MAX (CIFSSEC_MUST_SIGN | CIFSSEC_MUST_NTLMV2)
1767 #define CIFSSEC_AUTH_MASK (CIFSSEC_MAY_NTLM | CIFSSEC_MAY_NTLMV2 | CIFSSEC_MAY_LANMAN | CIFSSEC_MAY_PLNTXT | CIFSSEC_MAY_KRB5 | CIFSSEC_MAY_NTLMSSP)
1769 *****************************************************************
1770 * All constants go here
1771 *****************************************************************
1774 #define UID_HASH (16)
1777 * Note that ONE module should define _DECLARE_GLOBALS_HERE to cause the
1778 * following to be declared.
1781 /****************************************************************************
1782 * Locking notes. All updates to global variables and lists should be
1783 * protected by spinlocks or semaphores.
1787 * GlobalMid_Lock protects:
1788 * list operations on pending_mid_q and oplockQ
1789 * updates to XID counters, multiplex id and SMB sequence numbers
1790 * list operations on global DnotifyReqList
1791 * updates to ses->status and TCP_Server_Info->tcpStatus
1792 * updates to server->CurrentMid
1793 * tcp_ses_lock protects:
1794 * list operations on tcp and SMB session lists
1795 * tcon->open_file_lock protects the list of open files hanging off the tcon
1796 * inode->open_file_lock protects the openFileList hanging off the inode
1797 * cfile->file_info_lock protects counters and fields in cifs file struct
1798 * f_owner.lock protects certain per file struct operations
1799 * mapping->page_lock protects certain per page operations
1801 * Note that the cifs_tcon.open_file_lock should be taken before
1802 * not after the cifsInodeInfo.open_file_lock
1806 * cifsInodeInfo->lock_sem protects:
1807 * the list of locks held by the inode
1809 ****************************************************************************/
1811 #ifdef DECLARE_GLOBALS_HERE
1812 #define GLOBAL_EXTERN
1814 #define GLOBAL_EXTERN extern
1818 * the list of TCP_Server_Info structures, ie each of the sockets
1819 * connecting our client to a distinct server (ip address), is
1820 * chained together by cifs_tcp_ses_list. The list of all our SMB
1821 * sessions (and from that the tree connections) can be found
1822 * by iterating over cifs_tcp_ses_list
1824 GLOBAL_EXTERN struct list_head cifs_tcp_ses_list;
1827 * This lock protects the cifs_tcp_ses_list, the list of smb sessions per
1828 * tcp session, and the list of tcon's per smb session. It also protects
1829 * the reference counters for the server, smb session, and tcon. It also
1830 * protects some fields in the TCP_Server_Info struct such as dstaddr. Finally,
1831 * changes to the tcon->tidStatus should be done while holding this lock.
1832 * generally the locks should be taken in order tcp_ses_lock before
1833 * tcon->open_file_lock and that before file->file_info_lock since the
1834 * structure order is cifs_socket-->cifs_ses-->cifs_tcon-->cifs_file
1836 GLOBAL_EXTERN spinlock_t cifs_tcp_ses_lock;
1839 * Global transaction id (XID) information
1841 GLOBAL_EXTERN unsigned int GlobalCurrentXid; /* protected by GlobalMid_Sem */
1842 GLOBAL_EXTERN unsigned int GlobalTotalActiveXid; /* prot by GlobalMid_Sem */
1843 GLOBAL_EXTERN unsigned int GlobalMaxActiveXid; /* prot by GlobalMid_Sem */
1844 GLOBAL_EXTERN spinlock_t GlobalMid_Lock; /* protects above & list operations */
1845 /* on midQ entries */
1847 * Global counters, updated atomically
1849 GLOBAL_EXTERN atomic_t sesInfoAllocCount;
1850 GLOBAL_EXTERN atomic_t tconInfoAllocCount;
1851 GLOBAL_EXTERN atomic_t tcpSesNextId;
1852 GLOBAL_EXTERN atomic_t tcpSesAllocCount;
1853 GLOBAL_EXTERN atomic_t tcpSesReconnectCount;
1854 GLOBAL_EXTERN atomic_t tconInfoReconnectCount;
1856 /* Various Debug counters */
1857 GLOBAL_EXTERN atomic_t bufAllocCount; /* current number allocated */
1858 #ifdef CONFIG_CIFS_STATS2
1859 GLOBAL_EXTERN atomic_t totBufAllocCount; /* total allocated over all time */
1860 GLOBAL_EXTERN atomic_t totSmBufAllocCount;
1861 extern unsigned int slow_rsp_threshold; /* number of secs before logging */
1863 GLOBAL_EXTERN atomic_t smBufAllocCount;
1864 GLOBAL_EXTERN atomic_t midCount;
1867 extern bool enable_oplocks; /* enable or disable oplocks */
1868 extern bool lookupCacheEnabled;
1869 extern unsigned int global_secflags; /* if on, session setup sent
1870 with more secure ntlmssp2 challenge/resp */
1871 extern unsigned int sign_CIFS_PDUs; /* enable smb packet signing */
1872 extern bool enable_gcm_256; /* allow optional negotiate of strongest signing (aes-gcm-256) */
1873 extern bool require_gcm_256; /* require use of strongest signing (aes-gcm-256) */
1874 extern bool enable_negotiate_signing; /* request use of faster (GMAC) signing if available */
1875 extern bool linuxExtEnabled;/*enable Linux/Unix CIFS extensions*/
1876 extern unsigned int CIFSMaxBufSize; /* max size not including hdr */
1877 extern unsigned int cifs_min_rcv; /* min size of big ntwrk buf pool */
1878 extern unsigned int cifs_min_small; /* min size of small buf pool */
1879 extern unsigned int cifs_max_pending; /* MAX requests at once to server*/
1880 extern bool disable_legacy_dialects; /* forbid vers=1.0 and vers=2.0 mounts */
1882 void cifs_oplock_break(struct work_struct *work);
1883 void cifs_queue_oplock_break(struct cifsFileInfo *cfile);
1884 void smb2_deferred_work_close(struct work_struct *work);
1886 extern const struct slow_work_ops cifs_oplock_break_ops;
1887 extern struct workqueue_struct *cifsiod_wq;
1888 extern struct workqueue_struct *decrypt_wq;
1889 extern struct workqueue_struct *fileinfo_put_wq;
1890 extern struct workqueue_struct *cifsoplockd_wq;
1891 extern struct workqueue_struct *deferredclose_wq;
1892 extern __u32 cifs_lock_secret;
1894 extern mempool_t *cifs_mid_poolp;
1896 /* Operations for different SMB versions */
1897 #define SMB1_VERSION_STRING "1.0"
1898 extern struct smb_version_operations smb1_operations;
1899 extern struct smb_version_values smb1_values;
1900 #define SMB20_VERSION_STRING "2.0"
1901 extern struct smb_version_operations smb20_operations;
1902 extern struct smb_version_values smb20_values;
1903 #define SMB21_VERSION_STRING "2.1"
1904 extern struct smb_version_operations smb21_operations;
1905 extern struct smb_version_values smb21_values;
1906 #define SMBDEFAULT_VERSION_STRING "default"
1907 extern struct smb_version_values smbdefault_values;
1908 #define SMB3ANY_VERSION_STRING "3"
1909 extern struct smb_version_values smb3any_values;
1910 #define SMB30_VERSION_STRING "3.0"
1911 extern struct smb_version_operations smb30_operations;
1912 extern struct smb_version_values smb30_values;
1913 #define SMB302_VERSION_STRING "3.02"
1914 #define ALT_SMB302_VERSION_STRING "3.0.2"
1915 /*extern struct smb_version_operations smb302_operations;*/ /* not needed yet */
1916 extern struct smb_version_values smb302_values;
1917 #define SMB311_VERSION_STRING "3.1.1"
1918 #define ALT_SMB311_VERSION_STRING "3.11"
1919 extern struct smb_version_operations smb311_operations;
1920 extern struct smb_version_values smb311_values;
1922 static inline char *get_security_type_str(enum securityEnum sectype)
1926 return "RawNTLMSSP";
1940 static inline bool is_smb1_server(struct TCP_Server_Info *server)
1942 return strcmp(server->vals->version_string, SMB1_VERSION_STRING) == 0;
1945 static inline bool is_tcon_dfs(struct cifs_tcon *tcon)
1948 * For SMB1, see MS-CIFS 2.4.55 SMB_COM_TREE_CONNECT_ANDX (0x75) and MS-CIFS 3.3.4.4 DFS
1949 * Subsystem Notifies That a Share Is a DFS Share.
1951 * For SMB2+, see MS-SMB2 2.2.10 SMB2 TREE_CONNECT Response and MS-SMB2 3.3.4.14 Server
1952 * Application Updates a Share.
1954 if (!tcon || !tcon->ses || !tcon->ses->server)
1956 return is_smb1_server(tcon->ses->server) ? tcon->Flags & SMB_SHARE_IS_IN_DFS :
1957 tcon->share_flags & (SHI1005_FLAGS_DFS | SHI1005_FLAGS_DFS_ROOT);
1960 #endif /* _CIFS_GLOB_H */