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 /* dns resolution interval in seconds */
79 #define SMB_DNS_RESOLVE_INTERVAL_DEFAULT 600
81 /* maximum number of PDUs in one compound */
82 #define MAX_COMPOUND 5
85 * Default number of credits to keep available for SMB3.
86 * This value is chosen somewhat arbitrarily. The Windows client
87 * defaults to 128 credits, the Windows server allows clients up to
88 * 512 credits (or 8K for later versions), and the NetApp server
89 * does not limit clients at all. Choose a high enough default value
90 * such that the client shouldn't limit performance, but allow mount
91 * to override (until you approach 64K, where we limit credits to 65000
92 * to reduce possibility of seeing more server credit overflow bugs.
94 #define SMB2_MAX_CREDITS_AVAILABLE 32000
98 #ifndef XATTR_DOS_ATTRIB
99 #define XATTR_DOS_ATTRIB "user.DOSATTRIB"
103 * CIFS vfs client Status information (based on what we know.)
106 /* associated with each tcp and smb session */
116 Unspecified = 0, /* not specified */
117 NTLMv2, /* Legacy NTLM auth with NTLMv2 hash */
118 RawNTLMSSP, /* NTLMSSP without SPNEGO, NTLMv2 hash */
119 Kerberos, /* Kerberos via SPNEGO */
127 /* crypto security descriptor definition */
129 struct shash_desc shash;
133 /* crypto hashing related structure/fields, not specific to a sec mech */
134 struct cifs_secmech {
135 struct crypto_shash *hmacmd5; /* hmac-md5 hash function */
136 struct crypto_shash *md5; /* md5 hash function */
137 struct crypto_shash *hmacsha256; /* hmac-sha256 hash function */
138 struct crypto_shash *cmacaes; /* block-cipher based MAC function */
139 struct crypto_shash *sha512; /* sha512 hash function */
140 struct sdesc *sdeschmacmd5; /* ctxt to generate ntlmv2 hash, CR1 */
141 struct sdesc *sdescmd5; /* ctxt to generate cifs/smb signature */
142 struct sdesc *sdeschmacsha256; /* ctxt to generate smb2 signature */
143 struct sdesc *sdesccmacaes; /* ctxt to generate smb3 signature */
144 struct sdesc *sdescsha512; /* ctxt to generate smb3.11 signing key */
145 struct crypto_aead *ccmaesencrypt; /* smb3 encryption aead */
146 struct crypto_aead *ccmaesdecrypt; /* smb3 decryption aead */
149 /* per smb session structure/fields */
150 struct ntlmssp_auth {
151 bool sesskey_per_smbsess; /* whether session key is per smb session */
152 __u32 client_flags; /* sent by client in type 1 ntlmsssp exchange */
153 __u32 server_flags; /* sent by server in type 2 ntlmssp exchange */
154 unsigned char ciphertext[CIFS_CPHTXT_SIZE]; /* sent to server */
155 char cryptkey[CIFS_CRYPTO_KEY_SIZE]; /* used by ntlmssp */
163 struct cifs_sid osid;
164 struct cifs_sid gsid;
165 struct cifs_ntace *ntaces;
166 struct cifs_ace *aces;
170 *****************************************************************
171 * Except the CIFS PDUs themselves all the
172 * globally interesting structs should go here
173 *****************************************************************
177 * A smb_rqst represents a complete request to be issued to a server. It's
178 * formed by a kvec array, followed by an array of pages. Page data is assumed
179 * to start at the beginning of the first page.
182 struct kvec *rq_iov; /* array of kvecs */
183 unsigned int rq_nvec; /* number of kvecs in array */
184 struct page **rq_pages; /* pointer to array of page ptrs */
185 unsigned int rq_offset; /* the offset to the 1st page */
186 unsigned int rq_npages; /* number pages in array */
187 unsigned int rq_pagesz; /* page size to use */
188 unsigned int rq_tailsz; /* length of last page */
192 struct TCP_Server_Info;
196 struct dfs_info3_param;
198 struct smb3_fs_context;
200 struct cifs_readdata;
201 struct cifs_writedata;
202 struct cifs_io_parms;
203 struct cifs_search_info;
204 struct cifsInodeInfo;
205 struct cifs_open_parms;
208 struct smb_version_operations {
209 int (*send_cancel)(struct TCP_Server_Info *, struct smb_rqst *,
210 struct mid_q_entry *);
211 bool (*compare_fids)(struct cifsFileInfo *, struct cifsFileInfo *);
212 /* setup request: allocate mid, sign message */
213 struct mid_q_entry *(*setup_request)(struct cifs_ses *,
214 struct TCP_Server_Info *,
216 /* setup async request: allocate mid, sign message */
217 struct mid_q_entry *(*setup_async_request)(struct TCP_Server_Info *,
219 /* check response: verify signature, map error */
220 int (*check_receive)(struct mid_q_entry *, struct TCP_Server_Info *,
222 void (*add_credits)(struct TCP_Server_Info *server,
223 const struct cifs_credits *credits,
225 void (*set_credits)(struct TCP_Server_Info *, const int);
226 int * (*get_credits_field)(struct TCP_Server_Info *, const int);
227 unsigned int (*get_credits)(struct mid_q_entry *);
228 __u64 (*get_next_mid)(struct TCP_Server_Info *);
229 void (*revert_current_mid)(struct TCP_Server_Info *server,
230 const unsigned int val);
231 /* data offset from read response message */
232 unsigned int (*read_data_offset)(char *);
234 * Data length from read response message
235 * When in_remaining is true, the returned data length is in
236 * message field DataRemaining for out-of-band data read (e.g through
237 * Memory Registration RDMA write in SMBD).
238 * Otherwise, the returned data length is in message field DataLength.
240 unsigned int (*read_data_length)(char *, bool in_remaining);
241 /* map smb to linux error */
242 int (*map_error)(char *, bool);
243 /* find mid corresponding to the response message */
244 struct mid_q_entry * (*find_mid)(struct TCP_Server_Info *, char *);
245 void (*dump_detail)(void *buf, struct TCP_Server_Info *ptcp_info);
246 void (*clear_stats)(struct cifs_tcon *);
247 void (*print_stats)(struct seq_file *m, struct cifs_tcon *);
248 void (*dump_share_caps)(struct seq_file *, struct cifs_tcon *);
249 /* verify the message */
250 int (*check_message)(char *, unsigned int, struct TCP_Server_Info *);
251 bool (*is_oplock_break)(char *, struct TCP_Server_Info *);
252 int (*handle_cancelled_mid)(struct mid_q_entry *, struct TCP_Server_Info *);
253 void (*downgrade_oplock)(struct TCP_Server_Info *server,
254 struct cifsInodeInfo *cinode, __u32 oplock,
255 unsigned int epoch, bool *purge_cache);
256 /* process transaction2 response */
257 bool (*check_trans2)(struct mid_q_entry *, struct TCP_Server_Info *,
259 /* check if we need to negotiate */
260 bool (*need_neg)(struct TCP_Server_Info *);
261 /* negotiate to the server */
262 int (*negotiate)(const unsigned int, struct cifs_ses *);
263 /* set negotiated write size */
264 unsigned int (*negotiate_wsize)(struct cifs_tcon *tcon, struct smb3_fs_context *ctx);
265 /* set negotiated read size */
266 unsigned int (*negotiate_rsize)(struct cifs_tcon *tcon, struct smb3_fs_context *ctx);
267 /* setup smb sessionn */
268 int (*sess_setup)(const unsigned int, struct cifs_ses *,
269 const struct nls_table *);
270 /* close smb session */
271 int (*logoff)(const unsigned int, struct cifs_ses *);
272 /* connect to a server share */
273 int (*tree_connect)(const unsigned int, struct cifs_ses *, const char *,
274 struct cifs_tcon *, const struct nls_table *);
275 /* close tree connecion */
276 int (*tree_disconnect)(const unsigned int, struct cifs_tcon *);
277 /* get DFS referrals */
278 int (*get_dfs_refer)(const unsigned int, struct cifs_ses *,
279 const char *, struct dfs_info3_param **,
280 unsigned int *, const struct nls_table *, int);
281 /* informational QFS call */
282 void (*qfs_tcon)(const unsigned int, struct cifs_tcon *,
283 struct cifs_sb_info *);
284 /* check if a path is accessible or not */
285 int (*is_path_accessible)(const unsigned int, struct cifs_tcon *,
286 struct cifs_sb_info *, const char *);
287 /* query path data from the server */
288 int (*query_path_info)(const unsigned int, struct cifs_tcon *,
289 struct cifs_sb_info *, const char *,
290 FILE_ALL_INFO *, bool *, bool *);
291 /* query file data from the server */
292 int (*query_file_info)(const unsigned int, struct cifs_tcon *,
293 struct cifs_fid *, FILE_ALL_INFO *);
294 /* query reparse tag from srv to determine which type of special file */
295 int (*query_reparse_tag)(const unsigned int xid, struct cifs_tcon *tcon,
296 struct cifs_sb_info *cifs_sb, const char *path,
298 /* get server index number */
299 int (*get_srv_inum)(const unsigned int, struct cifs_tcon *,
300 struct cifs_sb_info *, const char *,
301 u64 *uniqueid, FILE_ALL_INFO *);
302 /* set size by path */
303 int (*set_path_size)(const unsigned int, struct cifs_tcon *,
304 const char *, __u64, struct cifs_sb_info *, bool);
305 /* set size by file handle */
306 int (*set_file_size)(const unsigned int, struct cifs_tcon *,
307 struct cifsFileInfo *, __u64, bool);
309 int (*set_file_info)(struct inode *, const char *, FILE_BASIC_INFO *,
311 int (*set_compression)(const unsigned int, struct cifs_tcon *,
312 struct cifsFileInfo *);
313 /* check if we can send an echo or nor */
314 bool (*can_echo)(struct TCP_Server_Info *);
315 /* send echo request */
316 int (*echo)(struct TCP_Server_Info *);
317 /* create directory */
318 int (*posix_mkdir)(const unsigned int xid, struct inode *inode,
319 umode_t mode, struct cifs_tcon *tcon,
320 const char *full_path,
321 struct cifs_sb_info *cifs_sb);
322 int (*mkdir)(const unsigned int xid, struct inode *inode, umode_t mode,
323 struct cifs_tcon *tcon, const char *name,
324 struct cifs_sb_info *sb);
325 /* set info on created directory */
326 void (*mkdir_setinfo)(struct inode *, const char *,
327 struct cifs_sb_info *, struct cifs_tcon *,
329 /* remove directory */
330 int (*rmdir)(const unsigned int, struct cifs_tcon *, const char *,
331 struct cifs_sb_info *);
333 int (*unlink)(const unsigned int, struct cifs_tcon *, const char *,
334 struct cifs_sb_info *);
335 /* open, rename and delete file */
336 int (*rename_pending_delete)(const char *, struct dentry *,
338 /* send rename request */
339 int (*rename)(const unsigned int, struct cifs_tcon *, const char *,
340 const char *, struct cifs_sb_info *);
341 /* send create hardlink request */
342 int (*create_hardlink)(const unsigned int, struct cifs_tcon *,
343 const char *, const char *,
344 struct cifs_sb_info *);
345 /* query symlink target */
346 int (*query_symlink)(const unsigned int, struct cifs_tcon *,
347 struct cifs_sb_info *, const char *,
349 /* open a file for non-posix mounts */
350 int (*open)(const unsigned int, struct cifs_open_parms *,
351 __u32 *, FILE_ALL_INFO *);
352 /* set fid protocol-specific info */
353 void (*set_fid)(struct cifsFileInfo *, struct cifs_fid *, __u32);
355 void (*close)(const unsigned int, struct cifs_tcon *,
357 /* close a file, returning file attributes and timestamps */
358 void (*close_getattr)(const unsigned int xid, struct cifs_tcon *tcon,
359 struct cifsFileInfo *pfile_info);
360 /* send a flush request to the server */
361 int (*flush)(const unsigned int, struct cifs_tcon *, struct cifs_fid *);
362 /* async read from the server */
363 int (*async_readv)(struct cifs_readdata *);
364 /* async write to the server */
365 int (*async_writev)(struct cifs_writedata *,
366 void (*release)(struct kref *));
367 /* sync read from the server */
368 int (*sync_read)(const unsigned int, struct cifs_fid *,
369 struct cifs_io_parms *, unsigned int *, char **,
371 /* sync write to the server */
372 int (*sync_write)(const unsigned int, struct cifs_fid *,
373 struct cifs_io_parms *, unsigned int *, struct kvec *,
375 /* open dir, start readdir */
376 int (*query_dir_first)(const unsigned int, struct cifs_tcon *,
377 const char *, struct cifs_sb_info *,
378 struct cifs_fid *, __u16,
379 struct cifs_search_info *);
380 /* continue readdir */
381 int (*query_dir_next)(const unsigned int, struct cifs_tcon *,
383 __u16, struct cifs_search_info *srch_inf);
385 int (*close_dir)(const unsigned int, struct cifs_tcon *,
387 /* calculate a size of SMB message */
388 unsigned int (*calc_smb_size)(void *buf, struct TCP_Server_Info *ptcpi);
389 /* check for STATUS_PENDING and process the response if yes */
390 bool (*is_status_pending)(char *buf, struct TCP_Server_Info *server);
391 /* check for STATUS_NETWORK_SESSION_EXPIRED */
392 bool (*is_session_expired)(char *);
393 /* send oplock break response */
394 int (*oplock_response)(struct cifs_tcon *, struct cifs_fid *,
395 struct cifsInodeInfo *);
396 /* query remote filesystem */
397 int (*queryfs)(const unsigned int, struct cifs_tcon *,
398 struct cifs_sb_info *, struct kstatfs *);
399 /* send mandatory brlock to the server */
400 int (*mand_lock)(const unsigned int, struct cifsFileInfo *, __u64,
401 __u64, __u32, int, int, bool);
402 /* unlock range of mandatory locks */
403 int (*mand_unlock_range)(struct cifsFileInfo *, struct file_lock *,
405 /* push brlocks from the cache to the server */
406 int (*push_mand_locks)(struct cifsFileInfo *);
407 /* get lease key of the inode */
408 void (*get_lease_key)(struct inode *, struct cifs_fid *);
409 /* set lease key of the inode */
410 void (*set_lease_key)(struct inode *, struct cifs_fid *);
411 /* generate new lease key */
412 void (*new_lease_key)(struct cifs_fid *);
413 int (*generate_signingkey)(struct cifs_ses *);
414 int (*calc_signature)(struct smb_rqst *, struct TCP_Server_Info *,
415 bool allocate_crypto);
416 int (*set_integrity)(const unsigned int, struct cifs_tcon *tcon,
417 struct cifsFileInfo *src_file);
418 int (*enum_snapshots)(const unsigned int xid, struct cifs_tcon *tcon,
419 struct cifsFileInfo *src_file, void __user *);
420 int (*notify)(const unsigned int xid, struct file *pfile,
422 int (*query_mf_symlink)(unsigned int, struct cifs_tcon *,
423 struct cifs_sb_info *, const unsigned char *,
424 char *, unsigned int *);
425 int (*create_mf_symlink)(unsigned int, struct cifs_tcon *,
426 struct cifs_sb_info *, const unsigned char *,
427 char *, unsigned int *);
428 /* if we can do cache read operations */
429 bool (*is_read_op)(__u32);
430 /* set oplock level for the inode */
431 void (*set_oplock_level)(struct cifsInodeInfo *, __u32, unsigned int,
433 /* create lease context buffer for CREATE request */
434 char * (*create_lease_buf)(u8 *lease_key, u8 oplock);
435 /* parse lease context buffer and return oplock/epoch info */
436 __u8 (*parse_lease_buf)(void *buf, unsigned int *epoch, char *lkey);
437 ssize_t (*copychunk_range)(const unsigned int,
438 struct cifsFileInfo *src_file,
439 struct cifsFileInfo *target_file,
440 u64 src_off, u64 len, u64 dest_off);
441 int (*duplicate_extents)(const unsigned int, struct cifsFileInfo *src,
442 struct cifsFileInfo *target_file, u64 src_off, u64 len,
444 int (*validate_negotiate)(const unsigned int, struct cifs_tcon *);
445 ssize_t (*query_all_EAs)(const unsigned int, struct cifs_tcon *,
446 const unsigned char *, const unsigned char *, char *,
447 size_t, struct cifs_sb_info *);
448 int (*set_EA)(const unsigned int, struct cifs_tcon *, const char *,
449 const char *, const void *, const __u16,
450 const struct nls_table *, struct cifs_sb_info *);
451 struct cifs_ntsd * (*get_acl)(struct cifs_sb_info *, struct inode *,
452 const char *, u32 *, u32);
453 struct cifs_ntsd * (*get_acl_by_fid)(struct cifs_sb_info *,
454 const struct cifs_fid *, u32 *, u32);
455 int (*set_acl)(struct cifs_ntsd *, __u32, struct inode *, const char *,
457 /* writepages retry size */
458 unsigned int (*wp_retry_size)(struct inode *);
459 /* get mtu credits */
460 int (*wait_mtu_credits)(struct TCP_Server_Info *, unsigned int,
461 unsigned int *, struct cifs_credits *);
462 /* adjust previously taken mtu credits to request size */
463 int (*adjust_credits)(struct TCP_Server_Info *server,
464 struct cifs_credits *credits,
465 const unsigned int payload_size);
466 /* check if we need to issue closedir */
467 bool (*dir_needs_close)(struct cifsFileInfo *);
468 long (*fallocate)(struct file *, struct cifs_tcon *, int, loff_t,
470 /* init transform request - used for encryption for now */
471 int (*init_transform_rq)(struct TCP_Server_Info *, int num_rqst,
472 struct smb_rqst *, struct smb_rqst *);
473 int (*is_transform_hdr)(void *buf);
474 int (*receive_transform)(struct TCP_Server_Info *,
475 struct mid_q_entry **, char **, int *);
476 enum securityEnum (*select_sectype)(struct TCP_Server_Info *,
478 int (*next_header)(char *);
479 /* ioctl passthrough for query_info */
480 int (*ioctl_query_info)(const unsigned int xid,
481 struct cifs_tcon *tcon,
482 struct cifs_sb_info *cifs_sb,
483 __le16 *path, int is_dir,
485 /* make unix special files (block, char, fifo, socket) */
486 int (*make_node)(unsigned int xid,
488 struct dentry *dentry,
489 struct cifs_tcon *tcon,
490 const char *full_path,
492 dev_t device_number);
493 /* version specific fiemap implementation */
494 int (*fiemap)(struct cifs_tcon *tcon, struct cifsFileInfo *,
495 struct fiemap_extent_info *, u64, u64);
496 /* version specific llseek implementation */
497 loff_t (*llseek)(struct file *, struct cifs_tcon *, loff_t, int);
498 /* Check for STATUS_IO_TIMEOUT */
499 bool (*is_status_io_timeout)(char *buf);
500 /* Check for STATUS_NETWORK_NAME_DELETED */
501 void (*is_network_name_deleted)(char *buf, struct TCP_Server_Info *srv);
504 struct smb_version_values {
505 char *version_string;
507 __u32 req_capabilities;
508 __u32 large_lock_type;
509 __u32 exclusive_lock_type;
510 __u32 shared_lock_type;
511 __u32 unlock_lock_type;
512 size_t header_preamble_size;
514 size_t max_header_size;
515 size_t read_rsp_size;
517 unsigned int cap_unix;
518 unsigned int cap_nt_find;
519 unsigned int cap_large_files;
520 __u16 signing_enabled;
521 __u16 signing_required;
522 size_t create_lease_size;
525 #define HEADER_SIZE(server) (server->vals->header_size)
526 #define MAX_HEADER_SIZE(server) (server->vals->max_header_size)
529 * CIFS superblock mount flags (mnt_cifs_flags) to consider when
530 * trying to reuse existing superblock for a new mount
532 #define CIFS_MOUNT_MASK (CIFS_MOUNT_NO_PERM | CIFS_MOUNT_SET_UID | \
533 CIFS_MOUNT_SERVER_INUM | CIFS_MOUNT_DIRECT_IO | \
534 CIFS_MOUNT_NO_XATTR | CIFS_MOUNT_MAP_SPECIAL_CHR | \
535 CIFS_MOUNT_MAP_SFM_CHR | \
536 CIFS_MOUNT_UNX_EMUL | CIFS_MOUNT_NO_BRL | \
537 CIFS_MOUNT_CIFS_ACL | CIFS_MOUNT_OVERR_UID | \
538 CIFS_MOUNT_OVERR_GID | CIFS_MOUNT_DYNPERM | \
539 CIFS_MOUNT_NOPOSIXBRL | CIFS_MOUNT_NOSSYNC | \
540 CIFS_MOUNT_FSCACHE | CIFS_MOUNT_MF_SYMLINKS | \
541 CIFS_MOUNT_MULTIUSER | CIFS_MOUNT_STRICT_IO | \
542 CIFS_MOUNT_CIFS_BACKUPUID | CIFS_MOUNT_CIFS_BACKUPGID | \
543 CIFS_MOUNT_UID_FROM_ACL | CIFS_MOUNT_NO_HANDLE_CACHE | \
544 CIFS_MOUNT_NO_DFS | CIFS_MOUNT_MODE_FROM_SID | \
545 CIFS_MOUNT_RO_CACHE | CIFS_MOUNT_RW_CACHE)
548 * Generic VFS superblock mount flags (s_flags) to consider when
549 * trying to reuse existing superblock for a new mount
551 #define CIFS_MS_MASK (SB_RDONLY | SB_MANDLOCK | SB_NOEXEC | SB_NOSUID | \
552 SB_NODEV | SB_SYNCHRONOUS)
554 struct cifs_mnt_data {
555 struct cifs_sb_info *cifs_sb;
556 struct smb3_fs_context *ctx;
560 static inline unsigned int
561 get_rfc1002_length(void *buf)
563 return be32_to_cpu(*((__be32 *)buf)) & 0xffffff;
567 inc_rfc1001_len(void *buf, int count)
569 be32_add_cpu((__be32 *)buf, count);
572 struct TCP_Server_Info {
573 struct list_head tcp_ses_list;
574 struct list_head smb_ses_list;
575 __u64 conn_id; /* connection identifier (useful for debugging) */
576 int srv_count; /* reference counter */
577 /* 15 character server name + 0x20 16th byte indicating type = srv */
578 char server_RFC1001_name[RFC1001_NAME_LEN_WITH_NULL];
579 struct smb_version_operations *ops;
580 struct smb_version_values *vals;
581 /* updates to tcpStatus protected by GlobalMid_Lock */
582 enum statusEnum tcpStatus; /* what we think the status is */
583 char *hostname; /* hostname portion of UNC string */
584 struct socket *ssocket;
585 struct sockaddr_storage dstaddr;
586 struct sockaddr_storage srcaddr; /* locally bind to this IP */
590 wait_queue_head_t response_q;
591 wait_queue_head_t request_q; /* if more than maxmpx to srvr must block*/
592 struct list_head pending_mid_q;
593 bool noblocksnd; /* use blocking sendmsg */
594 bool noautotune; /* do not autotune send buf sizes */
596 unsigned int credits; /* send no more requests at once */
597 unsigned int max_credits; /* can override large 32000 default at mnt */
598 unsigned int in_flight; /* number of requests on the wire to server */
599 unsigned int max_in_flight; /* max number of requests that were on wire */
600 spinlock_t req_lock; /* protect the two values above */
601 struct mutex srv_mutex;
602 struct task_struct *tsk;
603 char server_GUID[16];
605 bool sign; /* is signing enabled on this connection? */
606 bool ignore_signature:1; /* skip validation of signatures in SMB2/3 rsp */
607 bool session_estab; /* mark when very first sess is established */
608 int echo_credits; /* echo reserved slots */
609 int oplock_credits; /* oplock break reserved slots */
610 bool echoes:1; /* enable echoes */
611 __u8 client_guid[SMB2_CLIENT_GUID_SIZE]; /* Client GUID */
612 u16 dialect; /* dialect index that server chose */
613 bool oplocks:1; /* enable oplocks */
614 unsigned int maxReq; /* Clients should submit no more */
615 /* than maxReq distinct unanswered SMBs to the server when using */
616 /* multiplexed reads or writes (for SMB1/CIFS only, not SMB2/SMB3) */
617 unsigned int maxBuf; /* maxBuf specifies the maximum */
618 /* message size the server can send or receive for non-raw SMBs */
619 /* maxBuf is returned by SMB NegotiateProtocol so maxBuf is only 0 */
620 /* when socket is setup (and during reconnect) before NegProt sent */
621 unsigned int max_rw; /* maxRw specifies the maximum */
622 /* message size the server can send or receive for */
623 /* SMB_COM_WRITE_RAW or SMB_COM_READ_RAW. */
624 unsigned int capabilities; /* selective disabling of caps by smb sess */
625 int timeAdj; /* Adjust for difference in server time zone in sec */
626 __u64 CurrentMid; /* multiplex id - rotating counter, protected by GlobalMid_Lock */
627 char cryptkey[CIFS_CRYPTO_KEY_SIZE]; /* used by ntlm, ntlmv2 etc */
628 /* 16th byte of RFC1001 workstation name is always null */
629 char workstation_RFC1001_name[RFC1001_NAME_LEN_WITH_NULL];
630 __u32 sequence_number; /* for signing, protected by srv_mutex */
631 __u32 reconnect_instance; /* incremented on each reconnect */
632 struct session_key session_key;
633 unsigned long lstrp; /* when we got last response from this server */
634 struct cifs_secmech secmech; /* crypto sec mech functs, descriptors */
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 struct delayed_work resolve; /* dns resolution workqueue job */
650 char *smallbuf; /* pointer to current "small" buffer */
651 char *bigbuf; /* pointer to current "big" buffer */
652 /* Total size of this PDU. Only valid from cifs_demultiplex_thread */
653 unsigned int pdu_size;
654 unsigned int total_read; /* total amount of data read in this pass */
655 atomic_t in_send; /* requests trying to send */
656 atomic_t num_waiters; /* blocked waiting to get in sendrecv */
657 #ifdef CONFIG_CIFS_FSCACHE
658 struct fscache_cookie *fscache; /* client index cache cookie */
660 #ifdef CONFIG_CIFS_STATS2
661 atomic_t num_cmds[NUMBER_OF_SMB2_COMMANDS]; /* total requests by cmd */
662 atomic_t smb2slowcmd[NUMBER_OF_SMB2_COMMANDS]; /* count resps > 1 sec */
663 __u64 time_per_cmd[NUMBER_OF_SMB2_COMMANDS]; /* total time per cmd */
664 __u32 slowest_cmd[NUMBER_OF_SMB2_COMMANDS];
665 __u32 fastest_cmd[NUMBER_OF_SMB2_COMMANDS];
667 unsigned int max_read;
668 unsigned int max_write;
669 unsigned int min_offload;
670 __le16 compress_algorithm;
671 __u16 signing_algorithm;
673 /* save initital negprot hash */
674 __u8 preauth_sha_hash[SMB2_PREAUTH_HASH_SIZE];
675 bool signing_negotiated; /* true if valid signing context rcvd from server */
676 bool posix_ext_supported;
677 struct delayed_work reconnect; /* reconnect workqueue job */
678 struct mutex reconnect_mutex; /* prevent simultaneous reconnects */
679 unsigned long echo_interval;
682 * Number of targets available for reconnect. The more targets
683 * the more tasks have to wait to let the demultiplex thread
687 bool noblockcnt; /* use non-blocking connect() */
688 bool is_channel; /* if a session channel */
689 #ifdef CONFIG_CIFS_SWN_UPCALL
690 bool use_swn_dstaddr;
691 struct sockaddr_storage swn_dstaddr;
693 #ifdef CONFIG_CIFS_DFS_UPCALL
694 bool is_dfs_conn; /* if a dfs connection */
698 struct cifs_credits {
700 unsigned int instance;
703 static inline unsigned int
704 in_flight(struct TCP_Server_Info *server)
707 spin_lock(&server->req_lock);
708 num = server->in_flight;
709 spin_unlock(&server->req_lock);
714 has_credits(struct TCP_Server_Info *server, int *credits, int num_credits)
717 spin_lock(&server->req_lock);
719 spin_unlock(&server->req_lock);
720 return num >= num_credits;
724 add_credits(struct TCP_Server_Info *server, const struct cifs_credits *credits,
727 server->ops->add_credits(server, credits, optype);
731 add_credits_and_wake_if(struct TCP_Server_Info *server,
732 const struct cifs_credits *credits, const int optype)
734 if (credits->value) {
735 server->ops->add_credits(server, credits, optype);
736 wake_up(&server->request_q);
741 set_credits(struct TCP_Server_Info *server, const int val)
743 server->ops->set_credits(server, val);
747 adjust_credits(struct TCP_Server_Info *server, struct cifs_credits *credits,
748 const unsigned int payload_size)
750 return server->ops->adjust_credits ?
751 server->ops->adjust_credits(server, credits, payload_size) : 0;
755 get_next_mid64(struct TCP_Server_Info *server)
757 return cpu_to_le64(server->ops->get_next_mid(server));
761 get_next_mid(struct TCP_Server_Info *server)
763 __u16 mid = server->ops->get_next_mid(server);
765 * The value in the SMB header should be little endian for easy
766 * on-the-wire decoding.
768 return cpu_to_le16(mid);
772 revert_current_mid(struct TCP_Server_Info *server, const unsigned int val)
774 if (server->ops->revert_current_mid)
775 server->ops->revert_current_mid(server, val);
779 revert_current_mid_from_hdr(struct TCP_Server_Info *server,
780 const struct smb2_sync_hdr *shdr)
782 unsigned int num = le16_to_cpu(shdr->CreditCharge);
784 return revert_current_mid(server, num > 0 ? num : 1);
788 get_mid(const struct smb_hdr *smb)
790 return le16_to_cpu(smb->Mid);
794 compare_mid(__u16 mid, const struct smb_hdr *smb)
796 return mid == le16_to_cpu(smb->Mid);
800 * When the server supports very large reads and writes via POSIX extensions,
801 * we can allow up to 2^24-1, minus the size of a READ/WRITE_AND_X header, not
802 * including the RFC1001 length.
804 * Note that this might make for "interesting" allocation problems during
805 * writeback however as we have to allocate an array of pointers for the
806 * pages. A 16M write means ~32kb page array with PAGE_SIZE == 4096.
808 * For reads, there is a similar problem as we need to allocate an array
809 * of kvecs to handle the receive, though that should only need to be done
812 #define CIFS_MAX_WSIZE ((1<<24) - 1 - sizeof(WRITE_REQ) + 4)
813 #define CIFS_MAX_RSIZE ((1<<24) - sizeof(READ_RSP) + 4)
816 * When the server doesn't allow large posix writes, only allow a rsize/wsize
817 * of 2^17-1 minus the size of the call header. That allows for a read or
818 * write up to the maximum size described by RFC1002.
820 #define CIFS_MAX_RFC1002_WSIZE ((1<<17) - 1 - sizeof(WRITE_REQ) + 4)
821 #define CIFS_MAX_RFC1002_RSIZE ((1<<17) - 1 - sizeof(READ_RSP) + 4)
824 * The default wsize is 1M. find_get_pages seems to return a maximum of 256
825 * pages in a single call. With PAGE_SIZE == 4k, this means we can fill
826 * a single wsize request with a single call.
828 #define CIFS_DEFAULT_IOSIZE (1024 * 1024)
829 #define SMB3_DEFAULT_IOSIZE (4 * 1024 * 1024)
832 * Windows only supports a max of 60kb reads and 65535 byte writes. Default to
833 * those values when posix extensions aren't in force. In actuality here, we
834 * use 65536 to allow for a write that is a multiple of 4k. Most servers seem
835 * to be ok with the extra byte even though Windows doesn't send writes that
840 * https://blogs.msdn.com/b/openspecification/archive/2009/04/10/smb-maximum-transmit-buffer-size-and-performance-tuning.aspx
842 #define CIFS_DEFAULT_NON_POSIX_RSIZE (60 * 1024)
843 #define CIFS_DEFAULT_NON_POSIX_WSIZE (65536)
846 * Macros to allow the TCP_Server_Info->net field and related code to drop out
847 * when CONFIG_NET_NS isn't set.
852 static inline struct net *cifs_net_ns(struct TCP_Server_Info *srv)
857 static inline void cifs_set_net_ns(struct TCP_Server_Info *srv, struct net *net)
864 static inline struct net *cifs_net_ns(struct TCP_Server_Info *srv)
869 static inline void cifs_set_net_ns(struct TCP_Server_Info *srv, struct net *net)
875 struct cifs_server_iface {
877 unsigned int rdma_capable : 1;
878 unsigned int rss_capable : 1;
879 struct sockaddr_storage sockaddr;
883 struct TCP_Server_Info *server;
884 __u8 signkey[SMB3_SIGN_KEY_SIZE];
888 * Session structure. One of these for each uid session with a particular host
891 struct list_head smb_ses_list;
892 struct list_head tcon_list;
893 struct cifs_tcon *tcon_ipc;
894 struct mutex session_mutex;
895 struct TCP_Server_Info *server; /* pointer to server info */
896 int ses_count; /* reference counter */
897 enum statusEnum status; /* updates protected by GlobalMid_Lock */
898 unsigned overrideSecFlg; /* if non-zero override global sec flags */
899 char *serverOS; /* name of operating system underlying server */
900 char *serverNOS; /* name of network operating system of server */
901 char *serverDomain; /* security realm of server */
902 __u64 Suid; /* remote smb uid */
903 kuid_t linux_uid; /* overriding owner of files on the mount */
904 kuid_t cred_uid; /* owner of credentials */
905 unsigned int capabilities;
906 char ip_addr[INET6_ADDRSTRLEN + 1]; /* Max ipv6 (or v4) addr string len */
907 char *user_name; /* must not be null except during init of sess
908 and after mount option parsing we fill it */
911 struct session_key auth_key;
912 struct ntlmssp_auth *ntlmssp; /* ciphertext, flags, server challenge */
913 enum securityEnum sectype; /* what security flavor was specified? */
914 bool sign; /* is signing required? */
915 bool need_reconnect:1; /* connection reset, uid now invalid */
917 bool binding:1; /* are we binding the session? */
919 __u8 smb3signingkey[SMB3_SIGN_KEY_SIZE];
920 __u8 smb3encryptionkey[SMB3_ENC_DEC_KEY_SIZE];
921 __u8 smb3decryptionkey[SMB3_ENC_DEC_KEY_SIZE];
922 __u8 preauth_sha_hash[SMB2_PREAUTH_HASH_SIZE];
924 __u8 binding_preauth_sha_hash[SMB2_PREAUTH_HASH_SIZE];
927 * Network interfaces available on the server this session is
930 * Other channels can be opened by connecting and binding this
931 * session to interfaces from this list.
933 * iface_lock should be taken when accessing any of these fields
935 spinlock_t iface_lock;
936 struct cifs_server_iface *iface_list;
938 unsigned long iface_last_update; /* jiffies */
940 #define CIFS_MAX_CHANNELS 16
941 struct cifs_chan chans[CIFS_MAX_CHANNELS];
942 struct cifs_chan *binding_chan;
945 atomic_t chan_seq; /* round robin state */
949 * When binding a new channel, we need to access the channel which isn't fully
954 struct cifs_chan *cifs_ses_binding_channel(struct cifs_ses *ses)
957 return ses->binding_chan;
963 * Returns the server pointer of the session. When binding a new
964 * channel this returns the last channel which isn't fully established
967 * This function should be use for negprot/sess.setup codepaths. For
968 * the other requests see cifs_pick_channel().
971 struct TCP_Server_Info *cifs_ses_server(struct cifs_ses *ses)
974 return ses->binding_chan->server;
980 cap_unix(struct cifs_ses *ses)
982 return ses->server->vals->cap_unix & ses->capabilities;
986 bool is_valid:1; /* Do we have a useable root fid */
987 bool file_all_info_is_valid:1;
989 unsigned long time; /* jiffies of when lease was taken */
990 struct kref refcount;
991 struct cifs_fid *fid;
992 struct mutex fid_mutex;
993 struct cifs_tcon *tcon;
994 struct dentry *dentry;
995 struct work_struct lease_break;
996 struct smb2_file_all_info file_all_info;
1000 * there is one of these for each connection to a resource on a particular
1004 struct list_head tcon_list;
1006 struct list_head rlist; /* reconnect list */
1007 atomic_t num_local_opens; /* num of all opens including disconnected */
1008 atomic_t num_remote_opens; /* num of all network opens on server */
1009 struct list_head openFileList;
1010 spinlock_t open_file_lock; /* protects list above */
1011 struct cifs_ses *ses; /* pointer to session associated with */
1012 char treeName[MAX_TREE_SIZE + 1]; /* UNC name of resource in ASCII */
1013 char *nativeFileSystem;
1014 char *password; /* for share-level security */
1015 __u32 tid; /* The 4 byte tree id */
1016 __u16 Flags; /* optional support bits */
1017 enum statusEnum tidStatus;
1018 atomic_t num_smbs_sent;
1021 atomic_t num_writes;
1023 atomic_t num_flushes;
1024 atomic_t num_oplock_brks;
1026 atomic_t num_closes;
1027 atomic_t num_deletes;
1028 atomic_t num_mkdirs;
1029 atomic_t num_posixopens;
1030 atomic_t num_posixmkdirs;
1031 atomic_t num_rmdirs;
1032 atomic_t num_renames;
1033 atomic_t num_t2renames;
1034 atomic_t num_ffirst;
1036 atomic_t num_fclose;
1037 atomic_t num_hardlinks;
1038 atomic_t num_symlinks;
1040 atomic_t num_acl_get;
1041 atomic_t num_acl_set;
1044 atomic_t smb2_com_sent[NUMBER_OF_SMB2_COMMANDS];
1045 atomic_t smb2_com_failed[NUMBER_OF_SMB2_COMMANDS];
1049 __u64 bytes_written;
1050 spinlock_t stat_lock; /* protects the two fields above */
1051 FILE_SYSTEM_DEVICE_INFO fsDevInfo;
1052 FILE_SYSTEM_ATTRIBUTE_INFO fsAttrInfo; /* ok if fs name truncated */
1053 FILE_SYSTEM_UNIX_INFO fsUnixInfo;
1054 bool ipc:1; /* set if connection to IPC$ share (always also pipe) */
1055 bool pipe:1; /* set if connection to pipe share */
1056 bool print:1; /* set if connection to printer share */
1059 bool nohandlecache:1; /* if strange server resource prob can turn off */
1061 bool seal:1; /* transport encryption for this mounted share */
1062 bool unix_ext:1; /* if false disable Linux extensions to CIFS protocol
1063 for this mount even if server would support */
1064 bool posix_extensions; /* if true SMB3.11 posix extensions enabled */
1065 bool local_lease:1; /* check leases (only) on local system not remote */
1066 bool broken_posix_open; /* e.g. Samba server versions < 3.3.2, 3.2.9 */
1067 bool broken_sparse_sup; /* if server or share does not support sparse */
1068 bool need_reconnect:1; /* connection reset, tid now invalid */
1069 bool need_reopen_files:1; /* need to reopen tcon file handles */
1070 bool use_resilient:1; /* use resilient instead of durable handles */
1071 bool use_persistent:1; /* use persistent instead of durable handles */
1072 bool no_lease:1; /* Do not request leases on files or directories */
1073 bool use_witness:1; /* use witness protocol */
1074 __le32 capabilities;
1076 __u32 maximal_access;
1077 __u32 vol_serial_number;
1078 __le64 vol_create_time;
1079 __u64 snapshot_time; /* for timewarp tokens - timestamp of snapshot */
1080 __u32 handle_timeout; /* persistent and durable handle timeout in ms */
1081 __u32 ss_flags; /* sector size flags */
1082 __u32 perf_sector_size; /* best sector size for perf */
1084 __u32 max_bytes_chunk;
1085 __u32 max_bytes_copy;
1086 #ifdef CONFIG_CIFS_FSCACHE
1087 u64 resource_id; /* server resource id */
1088 struct fscache_cookie *fscache; /* cookie for share */
1090 struct list_head pending_opens; /* list of incomplete opens */
1091 struct cached_fid crfid; /* Cached root fid */
1092 /* BB add field for back pointer to sb struct(s)? */
1093 #ifdef CONFIG_CIFS_DFS_UPCALL
1094 char *dfs_path; /* canonical DFS path */
1095 struct list_head ulist; /* cache update list */
1100 * This is a refcounted and timestamped container for a tcon pointer. The
1101 * container holds a tcon reference. It is considered safe to free one of
1102 * these when the tl_count goes to 0. The tl_time is the time of the last
1103 * "get" on the container.
1106 struct rb_node tl_rbnode;
1108 unsigned long tl_flags;
1109 #define TCON_LINK_MASTER 0
1110 #define TCON_LINK_PENDING 1
1111 #define TCON_LINK_IN_TREE 2
1112 unsigned long tl_time;
1114 struct cifs_tcon *tl_tcon;
1117 extern struct tcon_link *cifs_sb_tlink(struct cifs_sb_info *cifs_sb);
1118 extern void smb3_free_compound_rqst(int num_rqst, struct smb_rqst *rqst);
1120 static inline struct cifs_tcon *
1121 tlink_tcon(struct tcon_link *tlink)
1123 return tlink->tl_tcon;
1126 static inline struct tcon_link *
1127 cifs_sb_master_tlink(struct cifs_sb_info *cifs_sb)
1129 return cifs_sb->master_tlink;
1132 extern void cifs_put_tlink(struct tcon_link *tlink);
1134 static inline struct tcon_link *
1135 cifs_get_tlink(struct tcon_link *tlink)
1137 if (tlink && !IS_ERR(tlink))
1138 atomic_inc(&tlink->tl_count);
1142 /* This function is always expected to succeed */
1143 extern struct cifs_tcon *cifs_sb_master_tcon(struct cifs_sb_info *cifs_sb);
1145 #define CIFS_OPLOCK_NO_CHANGE 0xfe
1147 struct cifs_pending_open {
1148 struct list_head olist;
1149 struct tcon_link *tlink;
1154 struct cifs_deferred_close {
1155 struct list_head dlist;
1156 struct tcon_link *tlink;
1158 __u64 persistent_fid;
1163 * This info hangs off the cifsFileInfo structure, pointed to by llist.
1164 * This is used to track byte stream locks on the file
1166 struct cifsLockInfo {
1167 struct list_head llist; /* pointer to next cifsLockInfo */
1168 struct list_head blist; /* pointer to locks blocked on this */
1169 wait_queue_head_t block_q;
1178 * One of these for each open instance of a file
1180 struct cifs_search_info {
1181 loff_t index_of_last_entry;
1182 __u16 entries_in_buffer;
1185 char *ntwrk_buf_start;
1186 char *srch_entries_start;
1188 const char *presume_name;
1189 unsigned int resume_name_len;
1193 bool smallBuf:1; /* so we know which buf_release function to call */
1196 #define ACL_NO_MODE ((umode_t)(-1))
1197 struct cifs_open_parms {
1198 struct cifs_tcon *tcon;
1199 struct cifs_sb_info *cifs_sb;
1204 struct cifs_fid *fid;
1211 __u64 persistent_fid; /* persist file id for smb2 */
1212 __u64 volatile_fid; /* volatile file id for smb2 */
1213 __u8 lease_key[SMB2_LEASE_KEY_SIZE]; /* lease key for smb2 */
1214 __u8 create_guid[16];
1216 struct cifs_pending_open *pending_open;
1218 #ifdef CONFIG_CIFS_DEBUG2
1220 #endif /* CIFS_DEBUG2 */
1224 struct cifs_fid_locks {
1225 struct list_head llist;
1226 struct cifsFileInfo *cfile; /* fid that owns locks */
1227 struct list_head locks; /* locks held by fid above */
1230 struct cifsFileInfo {
1231 /* following two lists are protected by tcon->open_file_lock */
1232 struct list_head tlist; /* pointer to next fid owned by tcon */
1233 struct list_head flist; /* next fid (file instance) for this inode */
1234 /* lock list below protected by cifsi->lock_sem */
1235 struct cifs_fid_locks *llist; /* brlocks held by this fid */
1236 kuid_t uid; /* allows finding which FileInfo structure */
1237 __u32 pid; /* process id who opened file */
1238 struct cifs_fid fid; /* file id from remote */
1239 struct list_head rlist; /* reconnect list */
1240 /* BB add lock scope info here if needed */ ;
1241 /* lock scope id (0 if none) */
1242 struct dentry *dentry;
1243 struct tcon_link *tlink;
1244 unsigned int f_flags;
1245 bool invalidHandle:1; /* file closed via session abend */
1247 bool oplock_break_cancelled:1;
1248 unsigned int oplock_epoch; /* epoch from the lease break */
1249 __u32 oplock_level; /* oplock/lease level from the lease break */
1251 spinlock_t file_info_lock; /* protects four flag/count fields above */
1252 struct mutex fh_mutex; /* prevents reopen race after dead ses*/
1253 struct cifs_search_info srch_inf;
1254 struct work_struct oplock_break; /* work for oplock breaks */
1255 struct work_struct put; /* work for the final part of _put */
1256 struct delayed_work deferred;
1257 bool deferred_close_scheduled; /* Flag to indicate close is scheduled */
1260 struct cifs_io_parms {
1262 __u64 persistent_fid; /* persist file id for smb2 */
1263 __u64 volatile_fid; /* volatile file id for smb2 */
1266 unsigned int length;
1267 struct cifs_tcon *tcon;
1268 struct TCP_Server_Info *server;
1271 struct cifs_aio_ctx {
1272 struct kref refcount;
1273 struct list_head list;
1274 struct mutex aio_mutex;
1275 struct completion done;
1276 struct iov_iter iter;
1278 struct cifsFileInfo *cfile;
1281 unsigned int npages;
1284 unsigned int total_len;
1287 * Indicates if this aio_ctx is for direct_io,
1288 * If yes, iter is a copy of the user passed iov_iter
1293 /* asynchronous read support */
1294 struct cifs_readdata {
1295 struct kref refcount;
1296 struct list_head list;
1297 struct completion done;
1298 struct cifsFileInfo *cfile;
1299 struct address_space *mapping;
1300 struct cifs_aio_ctx *ctx;
1303 unsigned int got_bytes;
1306 struct work_struct work;
1307 int (*read_into_pages)(struct TCP_Server_Info *server,
1308 struct cifs_readdata *rdata,
1310 int (*copy_into_pages)(struct TCP_Server_Info *server,
1311 struct cifs_readdata *rdata,
1312 struct iov_iter *iter);
1314 struct TCP_Server_Info *server;
1315 #ifdef CONFIG_CIFS_SMB_DIRECT
1318 unsigned int pagesz;
1319 unsigned int page_offset;
1320 unsigned int tailsz;
1321 struct cifs_credits credits;
1322 unsigned int nr_pages;
1323 struct page **pages;
1326 /* asynchronous write support */
1327 struct cifs_writedata {
1328 struct kref refcount;
1329 struct list_head list;
1330 struct completion done;
1331 enum writeback_sync_modes sync_mode;
1332 struct work_struct work;
1333 struct cifsFileInfo *cfile;
1334 struct cifs_aio_ctx *ctx;
1339 struct TCP_Server_Info *server;
1340 #ifdef CONFIG_CIFS_SMB_DIRECT
1343 unsigned int pagesz;
1344 unsigned int page_offset;
1345 unsigned int tailsz;
1346 struct cifs_credits credits;
1347 unsigned int nr_pages;
1348 struct page **pages;
1352 * Take a reference on the file private data. Must be called with
1353 * cfile->file_info_lock held.
1356 cifsFileInfo_get_locked(struct cifsFileInfo *cifs_file)
1361 struct cifsFileInfo *cifsFileInfo_get(struct cifsFileInfo *cifs_file);
1362 void _cifsFileInfo_put(struct cifsFileInfo *cifs_file, bool wait_oplock_hdlr,
1364 void cifsFileInfo_put(struct cifsFileInfo *cifs_file);
1366 #define CIFS_CACHE_READ_FLG 1
1367 #define CIFS_CACHE_HANDLE_FLG 2
1368 #define CIFS_CACHE_RH_FLG (CIFS_CACHE_READ_FLG | CIFS_CACHE_HANDLE_FLG)
1369 #define CIFS_CACHE_WRITE_FLG 4
1370 #define CIFS_CACHE_RW_FLG (CIFS_CACHE_READ_FLG | CIFS_CACHE_WRITE_FLG)
1371 #define CIFS_CACHE_RHW_FLG (CIFS_CACHE_RW_FLG | CIFS_CACHE_HANDLE_FLG)
1373 #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))
1374 #define CIFS_CACHE_HANDLE(cinode) (cinode->oplock & CIFS_CACHE_HANDLE_FLG)
1375 #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))
1378 * One of these for each file inode
1381 struct cifsInodeInfo {
1382 bool can_cache_brlcks;
1383 struct list_head llist; /* locks helb by this inode */
1385 * NOTE: Some code paths call down_read(lock_sem) twice, so
1386 * we must always use cifs_down_write() instead of down_write()
1387 * for this semaphore to avoid deadlocks.
1389 struct rw_semaphore lock_sem; /* protect the fields above */
1390 /* BB add in lists for dirty pages i.e. write caching info for oplock */
1391 struct list_head openFileList;
1392 spinlock_t open_file_lock; /* protects openFileList */
1393 __u32 cifsAttrs; /* e.g. DOS archive bit, sparse, compressed, system */
1394 unsigned int oplock; /* oplock/lease level we have */
1395 unsigned int epoch; /* used to track lease state changes */
1396 #define CIFS_INODE_PENDING_OPLOCK_BREAK (0) /* oplock break in progress */
1397 #define CIFS_INODE_PENDING_WRITERS (1) /* Writes in progress */
1398 #define CIFS_INODE_FLAG_UNUSED (2) /* Unused flag */
1399 #define CIFS_INO_DELETE_PENDING (3) /* delete pending on server */
1400 #define CIFS_INO_INVALID_MAPPING (4) /* pagecache is invalid */
1401 #define CIFS_INO_LOCK (5) /* lock bit for synchronization */
1402 #define CIFS_INO_MODIFIED_ATTR (6) /* Indicate change in mtime/ctime */
1403 unsigned long flags;
1404 spinlock_t writers_lock;
1405 unsigned int writers; /* Number of writers on this inode */
1406 unsigned long time; /* jiffies of last update of inode */
1407 u64 server_eof; /* current file size on server -- protected by i_lock */
1408 u64 uniqueid; /* server inode number */
1409 u64 createtime; /* creation time on server */
1410 __u8 lease_key[SMB2_LEASE_KEY_SIZE]; /* lease key for this inode */
1411 #ifdef CONFIG_CIFS_FSCACHE
1412 struct fscache_cookie *fscache;
1414 struct inode vfs_inode;
1415 struct list_head deferred_closes; /* list of deferred closes */
1416 spinlock_t deferred_lock; /* protection on deferred list */
1417 bool lease_granted; /* Flag to indicate whether lease or oplock is granted. */
1420 static inline struct cifsInodeInfo *
1421 CIFS_I(struct inode *inode)
1423 return container_of(inode, struct cifsInodeInfo, vfs_inode);
1426 static inline struct cifs_sb_info *
1427 CIFS_SB(struct super_block *sb)
1429 return sb->s_fs_info;
1432 static inline struct cifs_sb_info *
1433 CIFS_FILE_SB(struct file *file)
1435 return CIFS_SB(file_inode(file)->i_sb);
1438 static inline char CIFS_DIR_SEP(const struct cifs_sb_info *cifs_sb)
1440 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_POSIX_PATHS)
1447 convert_delimiter(char *path, char delim)
1449 char old_delim, *pos;
1457 while ((pos = strchr(pos, old_delim)))
1461 #define cifs_stats_inc atomic_inc
1463 static inline void cifs_stats_bytes_written(struct cifs_tcon *tcon,
1467 spin_lock(&tcon->stat_lock);
1468 tcon->bytes_written += bytes;
1469 spin_unlock(&tcon->stat_lock);
1473 static inline void cifs_stats_bytes_read(struct cifs_tcon *tcon,
1476 spin_lock(&tcon->stat_lock);
1477 tcon->bytes_read += bytes;
1478 spin_unlock(&tcon->stat_lock);
1483 * This is the prototype for the mid receive function. This function is for
1484 * receiving the rest of the SMB frame, starting with the WordCount (which is
1485 * just after the MID in struct smb_hdr). Note:
1487 * - This will be called by cifsd, with no locks held.
1488 * - The mid will still be on the pending_mid_q.
1489 * - mid->resp_buf will point to the current buffer.
1491 * Returns zero on a successful receive, or an error. The receive state in
1492 * the TCP_Server_Info will also be updated.
1494 typedef int (mid_receive_t)(struct TCP_Server_Info *server,
1495 struct mid_q_entry *mid);
1498 * This is the prototype for the mid callback function. This is called once the
1499 * mid has been received off of the socket. When creating one, take special
1500 * care to avoid deadlocks. Things to bear in mind:
1502 * - it will be called by cifsd, with no locks held
1503 * - the mid will be removed from any lists
1505 typedef void (mid_callback_t)(struct mid_q_entry *mid);
1508 * This is the protopyte for mid handle function. This is called once the mid
1509 * has been recognized after decryption of the message.
1511 typedef int (mid_handle_t)(struct TCP_Server_Info *server,
1512 struct mid_q_entry *mid);
1514 /* one of these for every pending CIFS request to the server */
1515 struct mid_q_entry {
1516 struct list_head qhead; /* mids waiting on reply from this server */
1517 struct kref refcount;
1518 struct TCP_Server_Info *server; /* server corresponding to this mid */
1519 __u64 mid; /* multiplex id */
1520 __u16 credits; /* number of credits consumed by this mid */
1521 __u16 credits_received; /* number of credits from the response */
1522 __u32 pid; /* process id */
1523 __u32 sequence_number; /* for CIFS signing */
1524 unsigned long when_alloc; /* when mid was created */
1525 #ifdef CONFIG_CIFS_STATS2
1526 unsigned long when_sent; /* time when smb send finished */
1527 unsigned long when_received; /* when demux complete (taken off wire) */
1529 mid_receive_t *receive; /* call receive callback */
1530 mid_callback_t *callback; /* call completion callback */
1531 mid_handle_t *handle; /* call handle mid callback */
1532 void *callback_data; /* general purpose pointer for callback */
1533 struct task_struct *creator;
1534 void *resp_buf; /* pointer to received SMB header */
1535 unsigned int resp_buf_size;
1536 int mid_state; /* wish this were enum but can not pass to wait_event */
1537 unsigned int mid_flags;
1538 __le16 command; /* smb command code */
1539 unsigned int optype; /* operation type */
1540 bool large_buf:1; /* if valid response, is pointer to large buf */
1541 bool multiRsp:1; /* multiple trans2 responses for one request */
1542 bool multiEnd:1; /* both received */
1543 bool decrypted:1; /* decrypted entry */
1546 struct close_cancelled_open {
1547 struct cifs_fid fid;
1548 struct cifs_tcon *tcon;
1549 struct work_struct work;
1554 /* Make code in transport.c a little cleaner by moving
1555 update of optional stats into function below */
1556 static inline void cifs_in_send_inc(struct TCP_Server_Info *server)
1558 atomic_inc(&server->in_send);
1561 static inline void cifs_in_send_dec(struct TCP_Server_Info *server)
1563 atomic_dec(&server->in_send);
1566 static inline void cifs_num_waiters_inc(struct TCP_Server_Info *server)
1568 atomic_inc(&server->num_waiters);
1571 static inline void cifs_num_waiters_dec(struct TCP_Server_Info *server)
1573 atomic_dec(&server->num_waiters);
1576 #ifdef CONFIG_CIFS_STATS2
1577 static inline void cifs_save_when_sent(struct mid_q_entry *mid)
1579 mid->when_sent = jiffies;
1582 static inline void cifs_save_when_sent(struct mid_q_entry *mid)
1587 /* for pending dnotify requests */
1588 struct dir_notify_req {
1589 struct list_head lhead;
1596 __u32 filter; /* CompletionFilter (for multishot) */
1601 struct dfs_info3_param {
1602 int flags; /* DFSREF_REFERRAL_SERVER, DFSREF_STORAGE_SERVER*/
1612 struct list_head list;
1613 struct cifsFileInfo *cfile;
1617 * common struct for holding inode info when searching for or updating an
1618 * inode with new info
1621 #define CIFS_FATTR_DFS_REFERRAL 0x1
1622 #define CIFS_FATTR_DELETE_PENDING 0x2
1623 #define CIFS_FATTR_NEED_REVAL 0x4
1624 #define CIFS_FATTR_INO_COLLISION 0x8
1625 #define CIFS_FATTR_UNKNOWN_NLINK 0x10
1626 #define CIFS_FATTR_FAKE_ROOT_INO 0x20
1639 unsigned int cf_nlink;
1640 unsigned int cf_dtype;
1641 struct timespec64 cf_atime;
1642 struct timespec64 cf_mtime;
1643 struct timespec64 cf_ctime;
1647 static inline void free_dfs_info_param(struct dfs_info3_param *param)
1650 kfree(param->path_name);
1651 kfree(param->node_name);
1655 static inline void free_dfs_info_array(struct dfs_info3_param *param,
1656 int number_of_items)
1659 if ((number_of_items == 0) || (param == NULL))
1661 for (i = 0; i < number_of_items; i++) {
1662 kfree(param[i].path_name);
1663 kfree(param[i].node_name);
1668 static inline bool is_interrupt_error(int error)
1673 case -ERESTARTNOHAND:
1674 case -ERESTARTNOINTR:
1680 static inline bool is_retryable_error(int error)
1682 if (is_interrupt_error(error) || error == -EAGAIN)
1688 /* cifs_get_writable_file() flags */
1689 #define FIND_WR_ANY 0
1690 #define FIND_WR_FSUID_ONLY 1
1691 #define FIND_WR_WITH_DELETE 2
1694 #define MID_REQUEST_ALLOCATED 1
1695 #define MID_REQUEST_SUBMITTED 2
1696 #define MID_RESPONSE_RECEIVED 4
1697 #define MID_RETRY_NEEDED 8 /* session closed while this request out */
1698 #define MID_RESPONSE_MALFORMED 0x10
1699 #define MID_SHUTDOWN 0x20
1702 #define MID_WAIT_CANCELLED 1 /* Cancelled while waiting for response */
1703 #define MID_DELETED 2 /* Mid has been dequeued/deleted */
1705 /* Types of response buffer returned from SendReceive2 */
1706 #define CIFS_NO_BUFFER 0 /* Response buffer not returned */
1707 #define CIFS_SMALL_BUFFER 1
1708 #define CIFS_LARGE_BUFFER 2
1709 #define CIFS_IOVEC 4 /* array of response buffers */
1711 /* Type of Request to SendReceive2 */
1712 #define CIFS_BLOCKING_OP 1 /* operation can block */
1713 #define CIFS_NON_BLOCKING 2 /* do not block waiting for credits */
1714 #define CIFS_TIMEOUT_MASK 0x003 /* only one of above set in req */
1715 #define CIFS_LOG_ERROR 0x010 /* log NT STATUS if non-zero */
1716 #define CIFS_LARGE_BUF_OP 0x020 /* large request buffer */
1717 #define CIFS_NO_RSP_BUF 0x040 /* no response buffer required */
1719 /* Type of request operation */
1720 #define CIFS_ECHO_OP 0x080 /* echo request */
1721 #define CIFS_OBREAK_OP 0x0100 /* oplock break request */
1722 #define CIFS_NEG_OP 0x0200 /* negotiate request */
1723 #define CIFS_CP_CREATE_CLOSE_OP 0x0400 /* compound create+close request */
1724 /* Lower bitmask values are reserved by others below. */
1725 #define CIFS_SESS_OP 0x2000 /* session setup request */
1726 #define CIFS_OP_MASK 0x2780 /* mask request type */
1728 #define CIFS_HAS_CREDITS 0x0400 /* already has credits */
1729 #define CIFS_TRANSFORM_REQ 0x0800 /* transform request before sending */
1730 #define CIFS_NO_SRV_RSP 0x1000 /* there is no server response */
1732 /* Security Flags: indicate type of session setup needed */
1733 #define CIFSSEC_MAY_SIGN 0x00001
1734 #define CIFSSEC_MAY_NTLMV2 0x00004
1735 #define CIFSSEC_MAY_KRB5 0x00008
1736 #define CIFSSEC_MAY_SEAL 0x00040 /* not supported yet */
1737 #define CIFSSEC_MAY_NTLMSSP 0x00080 /* raw ntlmssp with ntlmv2 */
1739 #define CIFSSEC_MUST_SIGN 0x01001
1740 /* note that only one of the following can be set so the
1741 result of setting MUST flags more than once will be to
1742 require use of the stronger protocol */
1743 #define CIFSSEC_MUST_NTLMV2 0x04004
1744 #define CIFSSEC_MUST_KRB5 0x08008
1745 #ifdef CONFIG_CIFS_UPCALL
1746 #define CIFSSEC_MASK 0x8F08F /* flags supported if no weak allowed */
1748 #define CIFSSEC_MASK 0x87087 /* flags supported if no weak allowed */
1750 #define CIFSSEC_MUST_SEAL 0x40040 /* not supported yet */
1751 #define CIFSSEC_MUST_NTLMSSP 0x80080 /* raw ntlmssp with ntlmv2 */
1753 #define CIFSSEC_DEF (CIFSSEC_MAY_SIGN | CIFSSEC_MAY_NTLMV2 | CIFSSEC_MAY_NTLMSSP)
1754 #define CIFSSEC_MAX (CIFSSEC_MUST_NTLMV2)
1755 #define CIFSSEC_AUTH_MASK (CIFSSEC_MAY_NTLMV2 | CIFSSEC_MAY_KRB5 | CIFSSEC_MAY_NTLMSSP)
1757 *****************************************************************
1758 * All constants go here
1759 *****************************************************************
1762 #define UID_HASH (16)
1765 * Note that ONE module should define _DECLARE_GLOBALS_HERE to cause the
1766 * following to be declared.
1769 /****************************************************************************
1770 * Locking notes. All updates to global variables and lists should be
1771 * protected by spinlocks or semaphores.
1775 * GlobalMid_Lock protects:
1776 * list operations on pending_mid_q and oplockQ
1777 * updates to XID counters, multiplex id and SMB sequence numbers
1778 * list operations on global DnotifyReqList
1779 * updates to ses->status and TCP_Server_Info->tcpStatus
1780 * updates to server->CurrentMid
1781 * tcp_ses_lock protects:
1782 * list operations on tcp and SMB session lists
1783 * tcon->open_file_lock protects the list of open files hanging off the tcon
1784 * inode->open_file_lock protects the openFileList hanging off the inode
1785 * cfile->file_info_lock protects counters and fields in cifs file struct
1786 * f_owner.lock protects certain per file struct operations
1787 * mapping->page_lock protects certain per page operations
1789 * Note that the cifs_tcon.open_file_lock should be taken before
1790 * not after the cifsInodeInfo.open_file_lock
1794 * cifsInodeInfo->lock_sem protects:
1795 * the list of locks held by the inode
1797 ****************************************************************************/
1799 #ifdef DECLARE_GLOBALS_HERE
1800 #define GLOBAL_EXTERN
1802 #define GLOBAL_EXTERN extern
1806 * the list of TCP_Server_Info structures, ie each of the sockets
1807 * connecting our client to a distinct server (ip address), is
1808 * chained together by cifs_tcp_ses_list. The list of all our SMB
1809 * sessions (and from that the tree connections) can be found
1810 * by iterating over cifs_tcp_ses_list
1812 GLOBAL_EXTERN struct list_head cifs_tcp_ses_list;
1815 * This lock protects the cifs_tcp_ses_list, the list of smb sessions per
1816 * tcp session, and the list of tcon's per smb session. It also protects
1817 * the reference counters for the server, smb session, and tcon. It also
1818 * protects some fields in the TCP_Server_Info struct such as dstaddr. Finally,
1819 * changes to the tcon->tidStatus should be done while holding this lock.
1820 * generally the locks should be taken in order tcp_ses_lock before
1821 * tcon->open_file_lock and that before file->file_info_lock since the
1822 * structure order is cifs_socket-->cifs_ses-->cifs_tcon-->cifs_file
1824 GLOBAL_EXTERN spinlock_t cifs_tcp_ses_lock;
1827 * Global transaction id (XID) information
1829 GLOBAL_EXTERN unsigned int GlobalCurrentXid; /* protected by GlobalMid_Sem */
1830 GLOBAL_EXTERN unsigned int GlobalTotalActiveXid; /* prot by GlobalMid_Sem */
1831 GLOBAL_EXTERN unsigned int GlobalMaxActiveXid; /* prot by GlobalMid_Sem */
1832 GLOBAL_EXTERN spinlock_t GlobalMid_Lock; /* protects above & list operations */
1833 /* on midQ entries */
1835 * Global counters, updated atomically
1837 GLOBAL_EXTERN atomic_t sesInfoAllocCount;
1838 GLOBAL_EXTERN atomic_t tconInfoAllocCount;
1839 GLOBAL_EXTERN atomic_t tcpSesNextId;
1840 GLOBAL_EXTERN atomic_t tcpSesAllocCount;
1841 GLOBAL_EXTERN atomic_t tcpSesReconnectCount;
1842 GLOBAL_EXTERN atomic_t tconInfoReconnectCount;
1844 /* Various Debug counters */
1845 GLOBAL_EXTERN atomic_t bufAllocCount; /* current number allocated */
1846 #ifdef CONFIG_CIFS_STATS2
1847 GLOBAL_EXTERN atomic_t totBufAllocCount; /* total allocated over all time */
1848 GLOBAL_EXTERN atomic_t totSmBufAllocCount;
1849 extern unsigned int slow_rsp_threshold; /* number of secs before logging */
1851 GLOBAL_EXTERN atomic_t smBufAllocCount;
1852 GLOBAL_EXTERN atomic_t midCount;
1855 extern bool enable_oplocks; /* enable or disable oplocks */
1856 extern bool lookupCacheEnabled;
1857 extern unsigned int global_secflags; /* if on, session setup sent
1858 with more secure ntlmssp2 challenge/resp */
1859 extern unsigned int sign_CIFS_PDUs; /* enable smb packet signing */
1860 extern bool enable_gcm_256; /* allow optional negotiate of strongest signing (aes-gcm-256) */
1861 extern bool require_gcm_256; /* require use of strongest signing (aes-gcm-256) */
1862 extern bool enable_negotiate_signing; /* request use of faster (GMAC) signing if available */
1863 extern bool linuxExtEnabled;/*enable Linux/Unix CIFS extensions*/
1864 extern unsigned int CIFSMaxBufSize; /* max size not including hdr */
1865 extern unsigned int cifs_min_rcv; /* min size of big ntwrk buf pool */
1866 extern unsigned int cifs_min_small; /* min size of small buf pool */
1867 extern unsigned int cifs_max_pending; /* MAX requests at once to server*/
1868 extern bool disable_legacy_dialects; /* forbid vers=1.0 and vers=2.0 mounts */
1870 void cifs_oplock_break(struct work_struct *work);
1871 void cifs_queue_oplock_break(struct cifsFileInfo *cfile);
1872 void smb2_deferred_work_close(struct work_struct *work);
1874 extern const struct slow_work_ops cifs_oplock_break_ops;
1875 extern struct workqueue_struct *cifsiod_wq;
1876 extern struct workqueue_struct *decrypt_wq;
1877 extern struct workqueue_struct *fileinfo_put_wq;
1878 extern struct workqueue_struct *cifsoplockd_wq;
1879 extern struct workqueue_struct *deferredclose_wq;
1880 extern __u32 cifs_lock_secret;
1882 extern mempool_t *cifs_mid_poolp;
1884 /* Operations for different SMB versions */
1885 #define SMB1_VERSION_STRING "1.0"
1886 extern struct smb_version_operations smb1_operations;
1887 extern struct smb_version_values smb1_values;
1888 #define SMB20_VERSION_STRING "2.0"
1889 extern struct smb_version_operations smb20_operations;
1890 extern struct smb_version_values smb20_values;
1891 #define SMB21_VERSION_STRING "2.1"
1892 extern struct smb_version_operations smb21_operations;
1893 extern struct smb_version_values smb21_values;
1894 #define SMBDEFAULT_VERSION_STRING "default"
1895 extern struct smb_version_values smbdefault_values;
1896 #define SMB3ANY_VERSION_STRING "3"
1897 extern struct smb_version_values smb3any_values;
1898 #define SMB30_VERSION_STRING "3.0"
1899 extern struct smb_version_operations smb30_operations;
1900 extern struct smb_version_values smb30_values;
1901 #define SMB302_VERSION_STRING "3.02"
1902 #define ALT_SMB302_VERSION_STRING "3.0.2"
1903 /*extern struct smb_version_operations smb302_operations;*/ /* not needed yet */
1904 extern struct smb_version_values smb302_values;
1905 #define SMB311_VERSION_STRING "3.1.1"
1906 #define ALT_SMB311_VERSION_STRING "3.11"
1907 extern struct smb_version_operations smb311_operations;
1908 extern struct smb_version_values smb311_values;
1910 static inline char *get_security_type_str(enum securityEnum sectype)
1914 return "RawNTLMSSP";
1924 static inline bool is_smb1_server(struct TCP_Server_Info *server)
1926 return strcmp(server->vals->version_string, SMB1_VERSION_STRING) == 0;
1929 static inline bool is_tcon_dfs(struct cifs_tcon *tcon)
1932 * For SMB1, see MS-CIFS 2.4.55 SMB_COM_TREE_CONNECT_ANDX (0x75) and MS-CIFS 3.3.4.4 DFS
1933 * Subsystem Notifies That a Share Is a DFS Share.
1935 * For SMB2+, see MS-SMB2 2.2.10 SMB2 TREE_CONNECT Response and MS-SMB2 3.3.4.14 Server
1936 * Application Updates a Share.
1938 if (!tcon || !tcon->ses || !tcon->ses->server)
1940 return is_smb1_server(tcon->ses->server) ? tcon->Flags & SMB_SHARE_IS_IN_DFS :
1941 tcon->share_flags & (SHI1005_FLAGS_DFS | SHI1005_FLAGS_DFS_ROOT);
1944 #endif /* _CIFS_GLOB_H */