1 /* SPDX-License-Identifier: LGPL-2.1 */
4 * Copyright (C) International Business Machines Corp., 2002,2008
5 * Author(s): Steve French (sfrench@us.ibm.com)
6 * Jeremy Allison (jra@samba.org)
13 #include <linux/in6.h>
14 #include <linux/inet.h>
15 #include <linux/slab.h>
16 #include <linux/scatterlist.h>
18 #include <linux/mempool.h>
19 #include <linux/workqueue.h>
20 #include <linux/utsname.h>
21 #include <linux/sched/mm.h>
22 #include <linux/netfs.h>
23 #include "cifs_fs_sb.h"
25 #include <crypto/internal/hash.h>
26 #include <uapi/linux/cifs/cifs_mount.h>
27 #include "../common/smb2pdu.h"
29 #include <linux/filelock.h>
31 #define SMB_PATH_MAX 260
33 #define RFC1001_PORT 139
36 * The sizes of various internal tables and strings
38 #define MAX_UID_INFO 16
39 #define MAX_SES_INFO 2
40 #define MAX_TCON_INFO 4
42 #define MAX_TREE_SIZE (2 + CIFS_NI_MAXHOST + 1 + CIFS_MAX_SHARE_LEN + 1)
44 #define CIFS_MIN_RCV_POOL 4
46 #define MAX_REOPEN_ATT 5 /* these many maximum attempts to reopen a file */
48 * default attribute cache timeout (jiffies)
50 #define CIFS_DEF_ACTIMEO (1 * HZ)
53 * max attribute cache timeout (jiffies) - 2^30
55 #define CIFS_MAX_ACTIMEO (1 << 30)
58 * Max persistent and resilient handle timeout (milliseconds).
59 * Windows durable max was 960000 (16 minutes)
61 #define SMB3_MAX_HANDLE_TIMEOUT 960000
64 * MAX_REQ is the maximum number of requests that WE will send
65 * on one socket concurrently.
67 #define CIFS_MAX_REQ 32767
69 #define RFC1001_NAME_LEN 15
70 #define RFC1001_NAME_LEN_WITH_NULL (RFC1001_NAME_LEN + 1)
72 /* maximum length of ip addr as a string (including ipv6 and sctp) */
73 #define SERVER_NAME_LENGTH 80
74 #define SERVER_NAME_LEN_WITH_NULL (SERVER_NAME_LENGTH + 1)
76 /* echo interval in seconds */
77 #define SMB_ECHO_INTERVAL_MIN 1
78 #define SMB_ECHO_INTERVAL_MAX 600
79 #define SMB_ECHO_INTERVAL_DEFAULT 60
81 /* smb multichannel query server interfaces interval in seconds */
82 #define SMB_INTERFACE_POLL_INTERVAL 600
84 /* maximum number of PDUs in one compound */
85 #define MAX_COMPOUND 5
88 * Default number of credits to keep available for SMB3.
89 * This value is chosen somewhat arbitrarily. The Windows client
90 * defaults to 128 credits, the Windows server allows clients up to
91 * 512 credits (or 8K for later versions), and the NetApp server
92 * does not limit clients at all. Choose a high enough default value
93 * such that the client shouldn't limit performance, but allow mount
94 * to override (until you approach 64K, where we limit credits to 65000
95 * to reduce possibility of seeing more server credit overflow bugs.
97 #define SMB2_MAX_CREDITS_AVAILABLE 32000
101 #ifndef XATTR_DOS_ATTRIB
102 #define XATTR_DOS_ATTRIB "user.DOSATTRIB"
105 #define CIFS_MAX_WORKSTATION_LEN (__NEW_UTS_LEN + 1) /* reasonable max for client */
107 #define CIFS_DFS_ROOT_SES(ses) ((ses)->dfs_root_ses ?: (ses))
110 * CIFS vfs client Status information (based on what we know.)
113 /* associated with each connection */
123 /* associated with each smb session */
124 enum ses_status_enum {
132 /* associated with each tree connection to the server */
133 enum tid_status_enum {
140 TID_NEED_FILES_INVALIDATE, /* currently unused */
141 TID_IN_FILES_INVALIDATE
145 Unspecified = 0, /* not specified */
146 NTLMv2, /* Legacy NTLM auth with NTLMv2 hash */
147 RawNTLMSSP, /* NTLMSSP without SPNEGO, NTLMv2 hash */
148 Kerberos, /* Kerberos via SPNEGO */
156 /* crypto hashing related structure/fields, not specific to a sec mech */
157 struct cifs_secmech {
158 struct shash_desc *hmacmd5; /* hmacmd5 hash function, for NTLMv2/CR1 hashes */
159 struct shash_desc *md5; /* md5 hash function, for CIFS/SMB1 signatures */
160 struct shash_desc *hmacsha256; /* hmac-sha256 hash function, for SMB2 signatures */
161 struct shash_desc *sha512; /* sha512 hash function, for SMB3.1.1 preauth hash */
162 struct shash_desc *aes_cmac; /* block-cipher based MAC function, for SMB3 signatures */
164 struct crypto_aead *enc; /* smb3 encryption AEAD TFM (AES-CCM and AES-GCM) */
165 struct crypto_aead *dec; /* smb3 decryption AEAD TFM (AES-CCM and AES-GCM) */
168 /* per smb session structure/fields */
169 struct ntlmssp_auth {
170 bool sesskey_per_smbsess; /* whether session key is per smb session */
171 __u32 client_flags; /* sent by client in type 1 ntlmsssp exchange */
172 __u32 server_flags; /* sent by server in type 2 ntlmssp exchange */
173 unsigned char ciphertext[CIFS_CPHTXT_SIZE]; /* sent to server */
174 char cryptkey[CIFS_CRYPTO_KEY_SIZE]; /* used by ntlmssp */
182 struct cifs_sid osid;
183 struct cifs_sid gsid;
184 struct cifs_ntace *ntaces;
185 struct cifs_ace *aces;
188 struct cifs_open_info_data {
197 struct reparse_data_buffer *buf;
198 struct reparse_posix_data *posix;
201 char *symlink_target;
203 struct smb2_file_all_info fi;
204 struct smb311_posix_qinfo posix_fi;
208 #define cifs_open_data_reparse(d) \
209 ((d)->reparse_point || \
210 (le32_to_cpu((d)->fi.Attributes) & ATTR_REPARSE))
212 static inline void cifs_free_open_info(struct cifs_open_info_data *data)
214 kfree(data->symlink_target);
218 *****************************************************************
219 * Except the CIFS PDUs themselves all the
220 * globally interesting structs should go here
221 *****************************************************************
225 * A smb_rqst represents a complete request to be issued to a server. It's
226 * formed by a kvec array, followed by an array of pages. Page data is assumed
227 * to start at the beginning of the first page.
230 struct kvec *rq_iov; /* array of kvecs */
231 unsigned int rq_nvec; /* number of kvecs in array */
232 size_t rq_iter_size; /* Amount of data in ->rq_iter */
233 struct iov_iter rq_iter; /* Data iterator */
234 struct xarray rq_buffer; /* Page buffer for encryption */
238 struct TCP_Server_Info;
242 struct dfs_info3_param;
244 struct smb3_fs_context;
246 struct cifs_readdata;
247 struct cifs_writedata;
248 struct cifs_io_parms;
249 struct cifs_search_info;
250 struct cifsInodeInfo;
251 struct cifs_open_parms;
254 struct smb_version_operations {
255 int (*send_cancel)(struct TCP_Server_Info *, struct smb_rqst *,
256 struct mid_q_entry *);
257 bool (*compare_fids)(struct cifsFileInfo *, struct cifsFileInfo *);
258 /* setup request: allocate mid, sign message */
259 struct mid_q_entry *(*setup_request)(struct cifs_ses *,
260 struct TCP_Server_Info *,
262 /* setup async request: allocate mid, sign message */
263 struct mid_q_entry *(*setup_async_request)(struct TCP_Server_Info *,
265 /* check response: verify signature, map error */
266 int (*check_receive)(struct mid_q_entry *, struct TCP_Server_Info *,
268 void (*add_credits)(struct TCP_Server_Info *server,
269 const struct cifs_credits *credits,
271 void (*set_credits)(struct TCP_Server_Info *, const int);
272 int * (*get_credits_field)(struct TCP_Server_Info *, const int);
273 unsigned int (*get_credits)(struct mid_q_entry *);
274 __u64 (*get_next_mid)(struct TCP_Server_Info *);
275 void (*revert_current_mid)(struct TCP_Server_Info *server,
276 const unsigned int val);
277 /* data offset from read response message */
278 unsigned int (*read_data_offset)(char *);
280 * Data length from read response message
281 * When in_remaining is true, the returned data length is in
282 * message field DataRemaining for out-of-band data read (e.g through
283 * Memory Registration RDMA write in SMBD).
284 * Otherwise, the returned data length is in message field DataLength.
286 unsigned int (*read_data_length)(char *, bool in_remaining);
287 /* map smb to linux error */
288 int (*map_error)(char *, bool);
289 /* find mid corresponding to the response message */
290 struct mid_q_entry * (*find_mid)(struct TCP_Server_Info *, char *);
291 void (*dump_detail)(void *buf, struct TCP_Server_Info *ptcp_info);
292 void (*clear_stats)(struct cifs_tcon *);
293 void (*print_stats)(struct seq_file *m, struct cifs_tcon *);
294 void (*dump_share_caps)(struct seq_file *, struct cifs_tcon *);
295 /* verify the message */
296 int (*check_message)(char *, unsigned int, struct TCP_Server_Info *);
297 bool (*is_oplock_break)(char *, struct TCP_Server_Info *);
298 int (*handle_cancelled_mid)(struct mid_q_entry *, struct TCP_Server_Info *);
299 void (*downgrade_oplock)(struct TCP_Server_Info *server,
300 struct cifsInodeInfo *cinode, __u32 oplock,
301 unsigned int epoch, bool *purge_cache);
302 /* process transaction2 response */
303 bool (*check_trans2)(struct mid_q_entry *, struct TCP_Server_Info *,
305 /* check if we need to negotiate */
306 bool (*need_neg)(struct TCP_Server_Info *);
307 /* negotiate to the server */
308 int (*negotiate)(const unsigned int xid,
309 struct cifs_ses *ses,
310 struct TCP_Server_Info *server);
311 /* set negotiated write size */
312 unsigned int (*negotiate_wsize)(struct cifs_tcon *tcon, struct smb3_fs_context *ctx);
313 /* set negotiated read size */
314 unsigned int (*negotiate_rsize)(struct cifs_tcon *tcon, struct smb3_fs_context *ctx);
315 /* setup smb sessionn */
316 int (*sess_setup)(const unsigned int, struct cifs_ses *,
317 struct TCP_Server_Info *server,
318 const struct nls_table *);
319 /* close smb session */
320 int (*logoff)(const unsigned int, struct cifs_ses *);
321 /* connect to a server share */
322 int (*tree_connect)(const unsigned int, struct cifs_ses *, const char *,
323 struct cifs_tcon *, const struct nls_table *);
324 /* close tree connecion */
325 int (*tree_disconnect)(const unsigned int, struct cifs_tcon *);
326 /* get DFS referrals */
327 int (*get_dfs_refer)(const unsigned int, struct cifs_ses *,
328 const char *, struct dfs_info3_param **,
329 unsigned int *, const struct nls_table *, int);
330 /* informational QFS call */
331 void (*qfs_tcon)(const unsigned int, struct cifs_tcon *,
332 struct cifs_sb_info *);
333 /* check if a path is accessible or not */
334 int (*is_path_accessible)(const unsigned int, struct cifs_tcon *,
335 struct cifs_sb_info *, const char *);
336 /* query path data from the server */
337 int (*query_path_info)(const unsigned int xid,
338 struct cifs_tcon *tcon,
339 struct cifs_sb_info *cifs_sb,
340 const char *full_path,
341 struct cifs_open_info_data *data);
342 /* query file data from the server */
343 int (*query_file_info)(const unsigned int xid, struct cifs_tcon *tcon,
344 struct cifsFileInfo *cfile, struct cifs_open_info_data *data);
345 /* query reparse point to determine which type of special file */
346 int (*query_reparse_point)(const unsigned int xid,
347 struct cifs_tcon *tcon,
348 struct cifs_sb_info *cifs_sb,
349 const char *full_path,
350 u32 *tag, struct kvec *rsp,
352 /* get server index number */
353 int (*get_srv_inum)(const unsigned int xid, struct cifs_tcon *tcon,
354 struct cifs_sb_info *cifs_sb, const char *full_path, u64 *uniqueid,
355 struct cifs_open_info_data *data);
356 /* set size by path */
357 int (*set_path_size)(const unsigned int, struct cifs_tcon *,
358 const char *, __u64, struct cifs_sb_info *, bool);
359 /* set size by file handle */
360 int (*set_file_size)(const unsigned int, struct cifs_tcon *,
361 struct cifsFileInfo *, __u64, bool);
363 int (*set_file_info)(struct inode *, const char *, FILE_BASIC_INFO *,
365 int (*set_compression)(const unsigned int, struct cifs_tcon *,
366 struct cifsFileInfo *);
367 /* check if we can send an echo or nor */
368 bool (*can_echo)(struct TCP_Server_Info *);
369 /* send echo request */
370 int (*echo)(struct TCP_Server_Info *);
371 /* create directory */
372 int (*posix_mkdir)(const unsigned int xid, struct inode *inode,
373 umode_t mode, struct cifs_tcon *tcon,
374 const char *full_path,
375 struct cifs_sb_info *cifs_sb);
376 int (*mkdir)(const unsigned int xid, struct inode *inode, umode_t mode,
377 struct cifs_tcon *tcon, const char *name,
378 struct cifs_sb_info *sb);
379 /* set info on created directory */
380 void (*mkdir_setinfo)(struct inode *, const char *,
381 struct cifs_sb_info *, struct cifs_tcon *,
383 /* remove directory */
384 int (*rmdir)(const unsigned int, struct cifs_tcon *, const char *,
385 struct cifs_sb_info *);
387 int (*unlink)(const unsigned int, struct cifs_tcon *, const char *,
388 struct cifs_sb_info *);
389 /* open, rename and delete file */
390 int (*rename_pending_delete)(const char *, struct dentry *,
392 /* send rename request */
393 int (*rename)(const unsigned int, struct cifs_tcon *, const char *,
394 const char *, struct cifs_sb_info *);
395 /* send create hardlink request */
396 int (*create_hardlink)(const unsigned int, struct cifs_tcon *,
397 const char *, const char *,
398 struct cifs_sb_info *);
399 /* query symlink target */
400 int (*query_symlink)(const unsigned int xid,
401 struct cifs_tcon *tcon,
402 struct cifs_sb_info *cifs_sb,
403 const char *full_path,
405 /* open a file for non-posix mounts */
406 int (*open)(const unsigned int xid, struct cifs_open_parms *oparms, __u32 *oplock,
408 /* set fid protocol-specific info */
409 void (*set_fid)(struct cifsFileInfo *, struct cifs_fid *, __u32);
411 void (*close)(const unsigned int, struct cifs_tcon *,
413 /* close a file, returning file attributes and timestamps */
414 void (*close_getattr)(const unsigned int xid, struct cifs_tcon *tcon,
415 struct cifsFileInfo *pfile_info);
416 /* send a flush request to the server */
417 int (*flush)(const unsigned int, struct cifs_tcon *, struct cifs_fid *);
418 /* async read from the server */
419 int (*async_readv)(struct cifs_readdata *);
420 /* async write to the server */
421 int (*async_writev)(struct cifs_writedata *,
422 void (*release)(struct kref *));
423 /* sync read from the server */
424 int (*sync_read)(const unsigned int, struct cifs_fid *,
425 struct cifs_io_parms *, unsigned int *, char **,
427 /* sync write to the server */
428 int (*sync_write)(const unsigned int, struct cifs_fid *,
429 struct cifs_io_parms *, unsigned int *, struct kvec *,
431 /* open dir, start readdir */
432 int (*query_dir_first)(const unsigned int, struct cifs_tcon *,
433 const char *, struct cifs_sb_info *,
434 struct cifs_fid *, __u16,
435 struct cifs_search_info *);
436 /* continue readdir */
437 int (*query_dir_next)(const unsigned int, struct cifs_tcon *,
439 __u16, struct cifs_search_info *srch_inf);
441 int (*close_dir)(const unsigned int, struct cifs_tcon *,
443 /* calculate a size of SMB message */
444 unsigned int (*calc_smb_size)(void *buf);
445 /* check for STATUS_PENDING and process the response if yes */
446 bool (*is_status_pending)(char *buf, struct TCP_Server_Info *server);
447 /* check for STATUS_NETWORK_SESSION_EXPIRED */
448 bool (*is_session_expired)(char *);
449 /* send oplock break response */
450 int (*oplock_response)(struct cifs_tcon *tcon, __u64 persistent_fid, __u64 volatile_fid,
451 __u16 net_fid, struct cifsInodeInfo *cifs_inode);
452 /* query remote filesystem */
453 int (*queryfs)(const unsigned int, struct cifs_tcon *,
454 struct cifs_sb_info *, struct kstatfs *);
455 /* send mandatory brlock to the server */
456 int (*mand_lock)(const unsigned int, struct cifsFileInfo *, __u64,
457 __u64, __u32, int, int, bool);
458 /* unlock range of mandatory locks */
459 int (*mand_unlock_range)(struct cifsFileInfo *, struct file_lock *,
461 /* push brlocks from the cache to the server */
462 int (*push_mand_locks)(struct cifsFileInfo *);
463 /* get lease key of the inode */
464 void (*get_lease_key)(struct inode *, struct cifs_fid *);
465 /* set lease key of the inode */
466 void (*set_lease_key)(struct inode *, struct cifs_fid *);
467 /* generate new lease key */
468 void (*new_lease_key)(struct cifs_fid *);
469 int (*generate_signingkey)(struct cifs_ses *ses,
470 struct TCP_Server_Info *server);
471 int (*calc_signature)(struct smb_rqst *, struct TCP_Server_Info *,
472 bool allocate_crypto);
473 int (*set_integrity)(const unsigned int, struct cifs_tcon *tcon,
474 struct cifsFileInfo *src_file);
475 int (*enum_snapshots)(const unsigned int xid, struct cifs_tcon *tcon,
476 struct cifsFileInfo *src_file, void __user *);
477 int (*notify)(const unsigned int xid, struct file *pfile,
478 void __user *pbuf, bool return_changes);
479 int (*query_mf_symlink)(unsigned int, struct cifs_tcon *,
480 struct cifs_sb_info *, const unsigned char *,
481 char *, unsigned int *);
482 int (*create_mf_symlink)(unsigned int, struct cifs_tcon *,
483 struct cifs_sb_info *, const unsigned char *,
484 char *, unsigned int *);
485 /* if we can do cache read operations */
486 bool (*is_read_op)(__u32);
487 /* set oplock level for the inode */
488 void (*set_oplock_level)(struct cifsInodeInfo *, __u32, unsigned int,
490 /* create lease context buffer for CREATE request */
491 char * (*create_lease_buf)(u8 *lease_key, u8 oplock);
492 /* parse lease context buffer and return oplock/epoch info */
493 __u8 (*parse_lease_buf)(void *buf, unsigned int *epoch, char *lkey);
494 ssize_t (*copychunk_range)(const unsigned int,
495 struct cifsFileInfo *src_file,
496 struct cifsFileInfo *target_file,
497 u64 src_off, u64 len, u64 dest_off);
498 int (*duplicate_extents)(const unsigned int, struct cifsFileInfo *src,
499 struct cifsFileInfo *target_file, u64 src_off, u64 len,
501 int (*validate_negotiate)(const unsigned int, struct cifs_tcon *);
502 ssize_t (*query_all_EAs)(const unsigned int, struct cifs_tcon *,
503 const unsigned char *, const unsigned char *, char *,
504 size_t, struct cifs_sb_info *);
505 int (*set_EA)(const unsigned int, struct cifs_tcon *, const char *,
506 const char *, const void *, const __u16,
507 const struct nls_table *, struct cifs_sb_info *);
508 struct cifs_ntsd * (*get_acl)(struct cifs_sb_info *, struct inode *,
509 const char *, u32 *, u32);
510 struct cifs_ntsd * (*get_acl_by_fid)(struct cifs_sb_info *,
511 const struct cifs_fid *, u32 *, u32);
512 int (*set_acl)(struct cifs_ntsd *, __u32, struct inode *, const char *,
514 /* writepages retry size */
515 unsigned int (*wp_retry_size)(struct inode *);
516 /* get mtu credits */
517 int (*wait_mtu_credits)(struct TCP_Server_Info *, unsigned int,
518 unsigned int *, struct cifs_credits *);
519 /* adjust previously taken mtu credits to request size */
520 int (*adjust_credits)(struct TCP_Server_Info *server,
521 struct cifs_credits *credits,
522 const unsigned int payload_size);
523 /* check if we need to issue closedir */
524 bool (*dir_needs_close)(struct cifsFileInfo *);
525 long (*fallocate)(struct file *, struct cifs_tcon *, int, loff_t,
527 /* init transform request - used for encryption for now */
528 int (*init_transform_rq)(struct TCP_Server_Info *, int num_rqst,
529 struct smb_rqst *, struct smb_rqst *);
530 int (*is_transform_hdr)(void *buf);
531 int (*receive_transform)(struct TCP_Server_Info *,
532 struct mid_q_entry **, char **, int *);
533 enum securityEnum (*select_sectype)(struct TCP_Server_Info *,
535 int (*next_header)(struct TCP_Server_Info *server, char *buf,
537 /* ioctl passthrough for query_info */
538 int (*ioctl_query_info)(const unsigned int xid,
539 struct cifs_tcon *tcon,
540 struct cifs_sb_info *cifs_sb,
541 __le16 *path, int is_dir,
543 /* make unix special files (block, char, fifo, socket) */
544 int (*make_node)(unsigned int xid,
546 struct dentry *dentry,
547 struct cifs_tcon *tcon,
548 const char *full_path,
550 dev_t device_number);
551 /* version specific fiemap implementation */
552 int (*fiemap)(struct cifs_tcon *tcon, struct cifsFileInfo *,
553 struct fiemap_extent_info *, u64, u64);
554 /* version specific llseek implementation */
555 loff_t (*llseek)(struct file *, struct cifs_tcon *, loff_t, int);
556 /* Check for STATUS_IO_TIMEOUT */
557 bool (*is_status_io_timeout)(char *buf);
558 /* Check for STATUS_NETWORK_NAME_DELETED */
559 bool (*is_network_name_deleted)(char *buf, struct TCP_Server_Info *srv);
560 int (*parse_reparse_point)(struct cifs_sb_info *cifs_sb,
561 struct kvec *rsp_iov,
562 struct cifs_open_info_data *data);
565 struct smb_version_values {
566 char *version_string;
568 __u32 req_capabilities;
569 __u32 large_lock_type;
570 __u32 exclusive_lock_type;
571 __u32 shared_lock_type;
572 __u32 unlock_lock_type;
573 size_t header_preamble_size;
575 size_t max_header_size;
576 size_t read_rsp_size;
578 unsigned int cap_unix;
579 unsigned int cap_nt_find;
580 unsigned int cap_large_files;
581 __u16 signing_enabled;
582 __u16 signing_required;
583 size_t create_lease_size;
586 #define HEADER_SIZE(server) (server->vals->header_size)
587 #define MAX_HEADER_SIZE(server) (server->vals->max_header_size)
588 #define HEADER_PREAMBLE_SIZE(server) (server->vals->header_preamble_size)
589 #define MID_HEADER_SIZE(server) (HEADER_SIZE(server) - 1 - HEADER_PREAMBLE_SIZE(server))
592 * CIFS superblock mount flags (mnt_cifs_flags) to consider when
593 * trying to reuse existing superblock for a new mount
595 #define CIFS_MOUNT_MASK (CIFS_MOUNT_NO_PERM | CIFS_MOUNT_SET_UID | \
596 CIFS_MOUNT_SERVER_INUM | CIFS_MOUNT_DIRECT_IO | \
597 CIFS_MOUNT_NO_XATTR | CIFS_MOUNT_MAP_SPECIAL_CHR | \
598 CIFS_MOUNT_MAP_SFM_CHR | \
599 CIFS_MOUNT_UNX_EMUL | CIFS_MOUNT_NO_BRL | \
600 CIFS_MOUNT_CIFS_ACL | CIFS_MOUNT_OVERR_UID | \
601 CIFS_MOUNT_OVERR_GID | CIFS_MOUNT_DYNPERM | \
602 CIFS_MOUNT_NOPOSIXBRL | CIFS_MOUNT_NOSSYNC | \
603 CIFS_MOUNT_FSCACHE | CIFS_MOUNT_MF_SYMLINKS | \
604 CIFS_MOUNT_MULTIUSER | CIFS_MOUNT_STRICT_IO | \
605 CIFS_MOUNT_CIFS_BACKUPUID | CIFS_MOUNT_CIFS_BACKUPGID | \
606 CIFS_MOUNT_UID_FROM_ACL | CIFS_MOUNT_NO_HANDLE_CACHE | \
607 CIFS_MOUNT_NO_DFS | CIFS_MOUNT_MODE_FROM_SID | \
608 CIFS_MOUNT_RO_CACHE | CIFS_MOUNT_RW_CACHE)
611 * Generic VFS superblock mount flags (s_flags) to consider when
612 * trying to reuse existing superblock for a new mount
614 #define CIFS_MS_MASK (SB_RDONLY | SB_MANDLOCK | SB_NOEXEC | SB_NOSUID | \
615 SB_NODEV | SB_SYNCHRONOUS)
617 struct cifs_mnt_data {
618 struct cifs_sb_info *cifs_sb;
619 struct smb3_fs_context *ctx;
623 static inline unsigned int
624 get_rfc1002_length(void *buf)
626 return be32_to_cpu(*((__be32 *)buf)) & 0xffffff;
630 inc_rfc1001_len(void *buf, int count)
632 be32_add_cpu((__be32 *)buf, count);
635 struct TCP_Server_Info {
636 struct list_head tcp_ses_list;
637 struct list_head smb_ses_list;
638 spinlock_t srv_lock; /* protect anything here that is not protected */
639 __u64 conn_id; /* connection identifier (useful for debugging) */
640 int srv_count; /* reference counter */
641 /* 15 character server name + 0x20 16th byte indicating type = srv */
642 char server_RFC1001_name[RFC1001_NAME_LEN_WITH_NULL];
643 struct smb_version_operations *ops;
644 struct smb_version_values *vals;
645 /* updates to tcpStatus protected by cifs_tcp_ses_lock */
646 enum statusEnum tcpStatus; /* what we think the status is */
647 char *hostname; /* hostname portion of UNC string */
648 struct socket *ssocket;
649 struct sockaddr_storage dstaddr;
650 struct sockaddr_storage srcaddr; /* locally bind to this IP */
654 wait_queue_head_t response_q;
655 wait_queue_head_t request_q; /* if more than maxmpx to srvr must block*/
656 spinlock_t mid_lock; /* protect mid queue and it's entries */
657 struct list_head pending_mid_q;
658 bool noblocksnd; /* use blocking sendmsg */
659 bool noautotune; /* do not autotune send buf sizes */
662 unsigned int credits; /* send no more requests at once */
663 unsigned int max_credits; /* can override large 32000 default at mnt */
664 unsigned int in_flight; /* number of requests on the wire to server */
665 unsigned int max_in_flight; /* max number of requests that were on wire */
666 spinlock_t req_lock; /* protect the two values above */
667 struct mutex _srv_mutex;
668 unsigned int nofs_flag;
669 struct task_struct *tsk;
670 char server_GUID[16];
672 bool sign; /* is signing enabled on this connection? */
673 bool ignore_signature:1; /* skip validation of signatures in SMB2/3 rsp */
674 bool session_estab; /* mark when very first sess is established */
675 int echo_credits; /* echo reserved slots */
676 int oplock_credits; /* oplock break reserved slots */
677 bool echoes:1; /* enable echoes */
678 __u8 client_guid[SMB2_CLIENT_GUID_SIZE]; /* Client GUID */
679 u16 dialect; /* dialect index that server chose */
680 bool oplocks:1; /* enable oplocks */
681 unsigned int maxReq; /* Clients should submit no more */
682 /* than maxReq distinct unanswered SMBs to the server when using */
683 /* multiplexed reads or writes (for SMB1/CIFS only, not SMB2/SMB3) */
684 unsigned int maxBuf; /* maxBuf specifies the maximum */
685 /* message size the server can send or receive for non-raw SMBs */
686 /* maxBuf is returned by SMB NegotiateProtocol so maxBuf is only 0 */
687 /* when socket is setup (and during reconnect) before NegProt sent */
688 unsigned int max_rw; /* maxRw specifies the maximum */
689 /* message size the server can send or receive for */
690 /* SMB_COM_WRITE_RAW or SMB_COM_READ_RAW. */
691 unsigned int capabilities; /* selective disabling of caps by smb sess */
692 int timeAdj; /* Adjust for difference in server time zone in sec */
693 __u64 CurrentMid; /* multiplex id - rotating counter, protected by GlobalMid_Lock */
694 char cryptkey[CIFS_CRYPTO_KEY_SIZE]; /* used by ntlm, ntlmv2 etc */
695 /* 16th byte of RFC1001 workstation name is always null */
696 char workstation_RFC1001_name[RFC1001_NAME_LEN_WITH_NULL];
697 __u32 sequence_number; /* for signing, protected by srv_mutex */
698 __u32 reconnect_instance; /* incremented on each reconnect */
699 struct session_key session_key;
700 unsigned long lstrp; /* when we got last response from this server */
701 struct cifs_secmech secmech; /* crypto sec mech functs, descriptors */
702 #define CIFS_NEGFLAVOR_UNENCAP 1 /* wct == 17, but no ext_sec */
703 #define CIFS_NEGFLAVOR_EXTENDED 2 /* wct == 17, ext_sec bit set */
704 char negflavor; /* NEGOTIATE response flavor */
705 /* extended security flavors that server supports */
706 bool sec_ntlmssp; /* supports NTLMSSP */
707 bool sec_kerberosu2u; /* supports U2U Kerberos */
708 bool sec_kerberos; /* supports plain Kerberos */
709 bool sec_mskerberos; /* supports legacy MS Kerberos */
710 bool large_buf; /* is current buffer large? */
711 /* use SMBD connection instead of socket */
713 /* point to the SMBD connection if RDMA is used instead of socket */
714 struct smbd_connection *smbd_conn;
715 struct delayed_work echo; /* echo ping workqueue job */
716 char *smallbuf; /* pointer to current "small" buffer */
717 char *bigbuf; /* pointer to current "big" buffer */
718 /* Total size of this PDU. Only valid from cifs_demultiplex_thread */
719 unsigned int pdu_size;
720 unsigned int total_read; /* total amount of data read in this pass */
721 atomic_t in_send; /* requests trying to send */
722 atomic_t num_waiters; /* blocked waiting to get in sendrecv */
723 #ifdef CONFIG_CIFS_STATS2
724 atomic_t num_cmds[NUMBER_OF_SMB2_COMMANDS]; /* total requests by cmd */
725 atomic_t smb2slowcmd[NUMBER_OF_SMB2_COMMANDS]; /* count resps > 1 sec */
726 __u64 time_per_cmd[NUMBER_OF_SMB2_COMMANDS]; /* total time per cmd */
727 __u32 slowest_cmd[NUMBER_OF_SMB2_COMMANDS];
728 __u32 fastest_cmd[NUMBER_OF_SMB2_COMMANDS];
730 unsigned int max_read;
731 unsigned int max_write;
732 unsigned int min_offload;
733 __le16 compress_algorithm;
734 __u16 signing_algorithm;
736 /* save initital negprot hash */
737 __u8 preauth_sha_hash[SMB2_PREAUTH_HASH_SIZE];
738 bool signing_negotiated; /* true if valid signing context rcvd from server */
739 bool posix_ext_supported;
740 struct delayed_work reconnect; /* reconnect workqueue job */
741 struct mutex reconnect_mutex; /* prevent simultaneous reconnects */
742 unsigned long echo_interval;
745 * Number of targets available for reconnect. The more targets
746 * the more tasks have to wait to let the demultiplex thread
750 bool noblockcnt; /* use non-blocking connect() */
753 * If this is a session channel,
754 * primary_server holds the ref-counted
755 * pointer to primary channel connection for the session.
757 #define SERVER_IS_CHAN(server) (!!(server)->primary_server)
758 struct TCP_Server_Info *primary_server;
759 __u16 channel_sequence_num; /* incremented on primary channel on each chan reconnect */
761 #ifdef CONFIG_CIFS_SWN_UPCALL
762 bool use_swn_dstaddr;
763 struct sockaddr_storage swn_dstaddr;
765 struct mutex refpath_lock; /* protects leaf_fullpath */
767 * leaf_fullpath: Canonical DFS referral path related to this
769 * It is used in DFS cache refresher, reconnect and may
770 * change due to nested DFS links.
772 * Protected by @refpath_lock and @srv_lock. The @refpath_lock is
773 * mostly used for not requiring a copy of @leaf_fullpath when getting
774 * cached or new DFS referrals (which might also sleep during I/O).
775 * While @srv_lock is held for making string and NULL comparions against
776 * both fields as in mount(2) and cache refresh.
778 * format: \\HOST\SHARE[\OPTIONAL PATH]
783 static inline bool is_smb1(struct TCP_Server_Info *server)
785 return HEADER_PREAMBLE_SIZE(server) != 0;
788 static inline void cifs_server_lock(struct TCP_Server_Info *server)
790 unsigned int nofs_flag = memalloc_nofs_save();
792 mutex_lock(&server->_srv_mutex);
793 server->nofs_flag = nofs_flag;
796 static inline void cifs_server_unlock(struct TCP_Server_Info *server)
798 unsigned int nofs_flag = server->nofs_flag;
800 mutex_unlock(&server->_srv_mutex);
801 memalloc_nofs_restore(nofs_flag);
804 struct cifs_credits {
806 unsigned int instance;
809 static inline unsigned int
810 in_flight(struct TCP_Server_Info *server)
814 spin_lock(&server->req_lock);
815 num = server->in_flight;
816 spin_unlock(&server->req_lock);
821 has_credits(struct TCP_Server_Info *server, int *credits, int num_credits)
825 spin_lock(&server->req_lock);
827 spin_unlock(&server->req_lock);
828 return num >= num_credits;
832 add_credits(struct TCP_Server_Info *server, const struct cifs_credits *credits,
835 server->ops->add_credits(server, credits, optype);
839 add_credits_and_wake_if(struct TCP_Server_Info *server,
840 const struct cifs_credits *credits, const int optype)
842 if (credits->value) {
843 server->ops->add_credits(server, credits, optype);
844 wake_up(&server->request_q);
849 set_credits(struct TCP_Server_Info *server, const int val)
851 server->ops->set_credits(server, val);
855 adjust_credits(struct TCP_Server_Info *server, struct cifs_credits *credits,
856 const unsigned int payload_size)
858 return server->ops->adjust_credits ?
859 server->ops->adjust_credits(server, credits, payload_size) : 0;
863 get_next_mid64(struct TCP_Server_Info *server)
865 return cpu_to_le64(server->ops->get_next_mid(server));
869 get_next_mid(struct TCP_Server_Info *server)
871 __u16 mid = server->ops->get_next_mid(server);
873 * The value in the SMB header should be little endian for easy
874 * on-the-wire decoding.
876 return cpu_to_le16(mid);
880 revert_current_mid(struct TCP_Server_Info *server, const unsigned int val)
882 if (server->ops->revert_current_mid)
883 server->ops->revert_current_mid(server, val);
887 revert_current_mid_from_hdr(struct TCP_Server_Info *server,
888 const struct smb2_hdr *shdr)
890 unsigned int num = le16_to_cpu(shdr->CreditCharge);
892 return revert_current_mid(server, num > 0 ? num : 1);
896 get_mid(const struct smb_hdr *smb)
898 return le16_to_cpu(smb->Mid);
902 compare_mid(__u16 mid, const struct smb_hdr *smb)
904 return mid == le16_to_cpu(smb->Mid);
908 * When the server supports very large reads and writes via POSIX extensions,
909 * we can allow up to 2^24-1, minus the size of a READ/WRITE_AND_X header, not
910 * including the RFC1001 length.
912 * Note that this might make for "interesting" allocation problems during
913 * writeback however as we have to allocate an array of pointers for the
914 * pages. A 16M write means ~32kb page array with PAGE_SIZE == 4096.
916 * For reads, there is a similar problem as we need to allocate an array
917 * of kvecs to handle the receive, though that should only need to be done
920 #define CIFS_MAX_WSIZE ((1<<24) - 1 - sizeof(WRITE_REQ) + 4)
921 #define CIFS_MAX_RSIZE ((1<<24) - sizeof(READ_RSP) + 4)
924 * When the server doesn't allow large posix writes, only allow a rsize/wsize
925 * of 2^17-1 minus the size of the call header. That allows for a read or
926 * write up to the maximum size described by RFC1002.
928 #define CIFS_MAX_RFC1002_WSIZE ((1<<17) - 1 - sizeof(WRITE_REQ) + 4)
929 #define CIFS_MAX_RFC1002_RSIZE ((1<<17) - 1 - sizeof(READ_RSP) + 4)
931 #define CIFS_DEFAULT_IOSIZE (1024 * 1024)
934 * Windows only supports a max of 60kb reads and 65535 byte writes. Default to
935 * those values when posix extensions aren't in force. In actuality here, we
936 * use 65536 to allow for a write that is a multiple of 4k. Most servers seem
937 * to be ok with the extra byte even though Windows doesn't send writes that
942 * https://blogs.msdn.com/b/openspecification/archive/2009/04/10/smb-maximum-transmit-buffer-size-and-performance-tuning.aspx
944 #define CIFS_DEFAULT_NON_POSIX_RSIZE (60 * 1024)
945 #define CIFS_DEFAULT_NON_POSIX_WSIZE (65536)
948 * Macros to allow the TCP_Server_Info->net field and related code to drop out
949 * when CONFIG_NET_NS isn't set.
954 static inline struct net *cifs_net_ns(struct TCP_Server_Info *srv)
959 static inline void cifs_set_net_ns(struct TCP_Server_Info *srv, struct net *net)
966 static inline struct net *cifs_net_ns(struct TCP_Server_Info *srv)
971 static inline void cifs_set_net_ns(struct TCP_Server_Info *srv, struct net *net)
977 struct cifs_server_iface {
978 struct list_head iface_head;
979 struct kref refcount;
981 size_t weight_fulfilled;
982 unsigned int num_channels;
983 unsigned int rdma_capable : 1;
984 unsigned int rss_capable : 1;
985 unsigned int is_active : 1; /* unset if non existent */
986 struct sockaddr_storage sockaddr;
989 /* release iface when last ref is dropped */
991 release_iface(struct kref *ref)
993 struct cifs_server_iface *iface = container_of(ref,
994 struct cifs_server_iface,
1000 unsigned int in_reconnect : 1; /* if session setup in progress for this channel */
1001 struct TCP_Server_Info *server;
1002 struct cifs_server_iface *iface; /* interface in use */
1003 __u8 signkey[SMB3_SIGN_KEY_SIZE];
1007 * Session structure. One of these for each uid session with a particular host
1010 struct list_head smb_ses_list;
1011 struct list_head rlist; /* reconnect list */
1012 struct list_head tcon_list;
1013 struct cifs_tcon *tcon_ipc;
1014 spinlock_t ses_lock; /* protect anything here that is not protected */
1015 struct mutex session_mutex;
1016 struct TCP_Server_Info *server; /* pointer to server info */
1017 int ses_count; /* reference counter */
1018 enum ses_status_enum ses_status; /* updates protected by cifs_tcp_ses_lock */
1019 unsigned int overrideSecFlg; /* if non-zero override global sec flags */
1020 char *serverOS; /* name of operating system underlying server */
1021 char *serverNOS; /* name of network operating system of server */
1022 char *serverDomain; /* security realm of server */
1023 __u64 Suid; /* remote smb uid */
1024 kuid_t linux_uid; /* overriding owner of files on the mount */
1025 kuid_t cred_uid; /* owner of credentials */
1026 unsigned int capabilities;
1027 char ip_addr[INET6_ADDRSTRLEN + 1]; /* Max ipv6 (or v4) addr string len */
1028 char *user_name; /* must not be null except during init of sess
1029 and after mount option parsing we fill it */
1032 char workstation_name[CIFS_MAX_WORKSTATION_LEN];
1033 struct session_key auth_key;
1034 struct ntlmssp_auth *ntlmssp; /* ciphertext, flags, server challenge */
1035 enum securityEnum sectype; /* what security flavor was specified? */
1036 bool sign; /* is signing required? */
1038 __u16 session_flags;
1039 __u8 smb3signingkey[SMB3_SIGN_KEY_SIZE];
1040 __u8 smb3encryptionkey[SMB3_ENC_DEC_KEY_SIZE];
1041 __u8 smb3decryptionkey[SMB3_ENC_DEC_KEY_SIZE];
1042 __u8 preauth_sha_hash[SMB2_PREAUTH_HASH_SIZE];
1045 * Network interfaces available on the server this session is
1048 * Other channels can be opened by connecting and binding this
1049 * session to interfaces from this list.
1051 * iface_lock should be taken when accessing any of these fields
1053 spinlock_t iface_lock;
1054 /* ========= begin: protected by iface_lock ======== */
1055 struct list_head iface_list;
1057 unsigned long iface_last_update; /* jiffies */
1058 /* ========= end: protected by iface_lock ======== */
1060 spinlock_t chan_lock;
1061 /* ========= begin: protected by chan_lock ======== */
1062 #define CIFS_MAX_CHANNELS 16
1063 #define CIFS_INVAL_CHAN_INDEX (-1)
1064 #define CIFS_ALL_CHANNELS_SET(ses) \
1065 ((1UL << (ses)->chan_count) - 1)
1066 #define CIFS_ALL_CHANS_GOOD(ses) \
1067 (!(ses)->chans_need_reconnect)
1068 #define CIFS_ALL_CHANS_NEED_RECONNECT(ses) \
1069 ((ses)->chans_need_reconnect == CIFS_ALL_CHANNELS_SET(ses))
1070 #define CIFS_SET_ALL_CHANS_NEED_RECONNECT(ses) \
1071 ((ses)->chans_need_reconnect = CIFS_ALL_CHANNELS_SET(ses))
1072 #define CIFS_CHAN_NEEDS_RECONNECT(ses, index) \
1073 test_bit((index), &(ses)->chans_need_reconnect)
1074 #define CIFS_CHAN_IN_RECONNECT(ses, index) \
1075 ((ses)->chans[(index)].in_reconnect)
1077 struct cifs_chan chans[CIFS_MAX_CHANNELS];
1080 atomic_t chan_seq; /* round robin state */
1083 * chans_need_reconnect is a bitmap indicating which of the channels
1084 * under this smb session needs to be reconnected.
1085 * If not multichannel session, only one bit will be used.
1087 * We will ask for sess and tcon reconnection only if all the
1088 * channels are marked for needing reconnection. This will
1089 * enable the sessions on top to continue to live till any
1090 * of the channels below are active.
1092 unsigned long chans_need_reconnect;
1093 /* ========= end: protected by chan_lock ======== */
1094 struct cifs_ses *dfs_root_ses;
1095 struct nls_table *local_nls;
1099 cap_unix(struct cifs_ses *ses)
1101 return ses->server->vals->cap_unix & ses->capabilities;
1105 * common struct for holding inode info when searching for or updating an
1106 * inode with new info
1109 #define CIFS_FATTR_JUNCTION 0x1
1110 #define CIFS_FATTR_DELETE_PENDING 0x2
1111 #define CIFS_FATTR_NEED_REVAL 0x4
1112 #define CIFS_FATTR_INO_COLLISION 0x8
1113 #define CIFS_FATTR_UNKNOWN_NLINK 0x10
1114 #define CIFS_FATTR_FAKE_ROOT_INO 0x20
1127 unsigned int cf_nlink;
1128 unsigned int cf_dtype;
1129 struct timespec64 cf_atime;
1130 struct timespec64 cf_mtime;
1131 struct timespec64 cf_ctime;
1133 char *cf_symlink_target;
1137 * there is one of these for each connection to a resource on a particular
1141 struct list_head tcon_list;
1143 struct list_head rlist; /* reconnect list */
1144 spinlock_t tc_lock; /* protect anything here that is not protected */
1145 atomic_t num_local_opens; /* num of all opens including disconnected */
1146 atomic_t num_remote_opens; /* num of all network opens on server */
1147 struct list_head openFileList;
1148 spinlock_t open_file_lock; /* protects list above */
1149 struct cifs_ses *ses; /* pointer to session associated with */
1150 char tree_name[MAX_TREE_SIZE + 1]; /* UNC name of resource in ASCII */
1151 char *nativeFileSystem;
1152 char *password; /* for share-level security */
1153 __u32 tid; /* The 4 byte tree id */
1154 __u16 Flags; /* optional support bits */
1155 enum tid_status_enum status;
1156 atomic_t num_smbs_sent;
1159 atomic_t num_writes;
1161 atomic_t num_flushes;
1162 atomic_t num_oplock_brks;
1164 atomic_t num_closes;
1165 atomic_t num_deletes;
1166 atomic_t num_mkdirs;
1167 atomic_t num_posixopens;
1168 atomic_t num_posixmkdirs;
1169 atomic_t num_rmdirs;
1170 atomic_t num_renames;
1171 atomic_t num_t2renames;
1172 atomic_t num_ffirst;
1174 atomic_t num_fclose;
1175 atomic_t num_hardlinks;
1176 atomic_t num_symlinks;
1178 atomic_t num_acl_get;
1179 atomic_t num_acl_set;
1182 atomic_t smb2_com_sent[NUMBER_OF_SMB2_COMMANDS];
1183 atomic_t smb2_com_failed[NUMBER_OF_SMB2_COMMANDS];
1187 __u64 bytes_written;
1188 spinlock_t stat_lock; /* protects the two fields above */
1189 FILE_SYSTEM_DEVICE_INFO fsDevInfo;
1190 FILE_SYSTEM_ATTRIBUTE_INFO fsAttrInfo; /* ok if fs name truncated */
1191 FILE_SYSTEM_UNIX_INFO fsUnixInfo;
1192 bool ipc:1; /* set if connection to IPC$ share (always also pipe) */
1193 bool pipe:1; /* set if connection to pipe share */
1194 bool print:1; /* set if connection to printer share */
1197 bool nohandlecache:1; /* if strange server resource prob can turn off */
1199 bool seal:1; /* transport encryption for this mounted share */
1200 bool unix_ext:1; /* if false disable Linux extensions to CIFS protocol
1201 for this mount even if server would support */
1202 bool posix_extensions; /* if true SMB3.11 posix extensions enabled */
1203 bool local_lease:1; /* check leases (only) on local system not remote */
1204 bool broken_posix_open; /* e.g. Samba server versions < 3.3.2, 3.2.9 */
1205 bool broken_sparse_sup; /* if server or share does not support sparse */
1206 bool need_reconnect:1; /* connection reset, tid now invalid */
1207 bool need_reopen_files:1; /* need to reopen tcon file handles */
1208 bool use_resilient:1; /* use resilient instead of durable handles */
1209 bool use_persistent:1; /* use persistent instead of durable handles */
1210 bool no_lease:1; /* Do not request leases on files or directories */
1211 bool use_witness:1; /* use witness protocol */
1212 __le32 capabilities;
1214 __u32 maximal_access;
1215 __u32 vol_serial_number;
1216 __le64 vol_create_time;
1217 __u64 snapshot_time; /* for timewarp tokens - timestamp of snapshot */
1218 __u32 handle_timeout; /* persistent and durable handle timeout in ms */
1219 __u32 ss_flags; /* sector size flags */
1220 __u32 perf_sector_size; /* best sector size for perf */
1222 __u32 max_bytes_chunk;
1223 __u32 max_bytes_copy;
1224 __u32 max_cached_dirs;
1225 #ifdef CONFIG_CIFS_FSCACHE
1226 u64 resource_id; /* server resource id */
1227 struct fscache_volume *fscache; /* cookie for share */
1229 struct list_head pending_opens; /* list of incomplete opens */
1230 struct cached_fids *cfids;
1231 /* BB add field for back pointer to sb struct(s)? */
1232 #ifdef CONFIG_CIFS_DFS_UPCALL
1233 struct list_head dfs_ses_list;
1234 struct delayed_work dfs_cache_work;
1236 struct delayed_work query_interfaces; /* query interfaces workqueue job */
1237 char *origin_fullpath; /* canonical copy of smb3_fs_context::source */
1241 * This is a refcounted and timestamped container for a tcon pointer. The
1242 * container holds a tcon reference. It is considered safe to free one of
1243 * these when the tl_count goes to 0. The tl_time is the time of the last
1244 * "get" on the container.
1247 struct rb_node tl_rbnode;
1249 unsigned long tl_flags;
1250 #define TCON_LINK_MASTER 0
1251 #define TCON_LINK_PENDING 1
1252 #define TCON_LINK_IN_TREE 2
1253 unsigned long tl_time;
1255 struct cifs_tcon *tl_tcon;
1258 extern struct tcon_link *cifs_sb_tlink(struct cifs_sb_info *cifs_sb);
1259 extern void smb3_free_compound_rqst(int num_rqst, struct smb_rqst *rqst);
1261 static inline struct cifs_tcon *
1262 tlink_tcon(struct tcon_link *tlink)
1264 return tlink->tl_tcon;
1267 static inline struct tcon_link *
1268 cifs_sb_master_tlink(struct cifs_sb_info *cifs_sb)
1270 return cifs_sb->master_tlink;
1273 extern void cifs_put_tlink(struct tcon_link *tlink);
1275 static inline struct tcon_link *
1276 cifs_get_tlink(struct tcon_link *tlink)
1278 if (tlink && !IS_ERR(tlink))
1279 atomic_inc(&tlink->tl_count);
1283 /* This function is always expected to succeed */
1284 extern struct cifs_tcon *cifs_sb_master_tcon(struct cifs_sb_info *cifs_sb);
1286 #define CIFS_OPLOCK_NO_CHANGE 0xfe
1288 struct cifs_pending_open {
1289 struct list_head olist;
1290 struct tcon_link *tlink;
1295 struct cifs_deferred_close {
1296 struct list_head dlist;
1297 struct tcon_link *tlink;
1299 __u64 persistent_fid;
1304 * This info hangs off the cifsFileInfo structure, pointed to by llist.
1305 * This is used to track byte stream locks on the file
1307 struct cifsLockInfo {
1308 struct list_head llist; /* pointer to next cifsLockInfo */
1309 struct list_head blist; /* pointer to locks blocked on this */
1310 wait_queue_head_t block_q;
1319 * One of these for each open instance of a file
1321 struct cifs_search_info {
1322 loff_t index_of_last_entry;
1323 __u16 entries_in_buffer;
1326 char *ntwrk_buf_start;
1327 char *srch_entries_start;
1329 const char *presume_name;
1330 unsigned int resume_name_len;
1334 bool smallBuf:1; /* so we know which buf_release function to call */
1337 #define ACL_NO_MODE ((umode_t)(-1))
1338 struct cifs_open_parms {
1339 struct cifs_tcon *tcon;
1340 struct cifs_sb_info *cifs_sb;
1345 struct cifs_fid *fid;
1352 __u64 persistent_fid; /* persist file id for smb2 */
1353 __u64 volatile_fid; /* volatile file id for smb2 */
1354 __u8 lease_key[SMB2_LEASE_KEY_SIZE]; /* lease key for smb2 */
1355 __u8 create_guid[16];
1357 struct cifs_pending_open *pending_open;
1359 #ifdef CONFIG_CIFS_DEBUG2
1361 #endif /* CIFS_DEBUG2 */
1365 struct cifs_fid_locks {
1366 struct list_head llist;
1367 struct cifsFileInfo *cfile; /* fid that owns locks */
1368 struct list_head locks; /* locks held by fid above */
1371 struct cifsFileInfo {
1372 /* following two lists are protected by tcon->open_file_lock */
1373 struct list_head tlist; /* pointer to next fid owned by tcon */
1374 struct list_head flist; /* next fid (file instance) for this inode */
1375 /* lock list below protected by cifsi->lock_sem */
1376 struct cifs_fid_locks *llist; /* brlocks held by this fid */
1377 kuid_t uid; /* allows finding which FileInfo structure */
1378 __u32 pid; /* process id who opened file */
1379 struct cifs_fid fid; /* file id from remote */
1380 struct list_head rlist; /* reconnect list */
1381 /* BB add lock scope info here if needed */
1382 /* lock scope id (0 if none) */
1383 struct dentry *dentry;
1384 struct tcon_link *tlink;
1385 unsigned int f_flags;
1386 bool invalidHandle:1; /* file closed via session abend */
1388 bool oplock_break_cancelled:1;
1389 unsigned int oplock_epoch; /* epoch from the lease break */
1390 __u32 oplock_level; /* oplock/lease level from the lease break */
1392 spinlock_t file_info_lock; /* protects four flag/count fields above */
1393 struct mutex fh_mutex; /* prevents reopen race after dead ses*/
1394 struct cifs_search_info srch_inf;
1395 struct work_struct oplock_break; /* work for oplock breaks */
1396 struct work_struct put; /* work for the final part of _put */
1397 struct delayed_work deferred;
1398 bool deferred_close_scheduled; /* Flag to indicate close is scheduled */
1399 char *symlink_target;
1402 struct cifs_io_parms {
1404 __u64 persistent_fid; /* persist file id for smb2 */
1405 __u64 volatile_fid; /* volatile file id for smb2 */
1408 unsigned int length;
1409 struct cifs_tcon *tcon;
1410 struct TCP_Server_Info *server;
1413 struct cifs_aio_ctx {
1414 struct kref refcount;
1415 struct list_head list;
1416 struct mutex aio_mutex;
1417 struct completion done;
1418 struct iov_iter iter;
1420 struct cifsFileInfo *cfile;
1423 unsigned int nr_pinned_pages;
1426 unsigned int total_len;
1427 unsigned int bv_need_unpin; /* If ->bv[] needs unpinning */
1430 * Indicates if this aio_ctx is for direct_io,
1431 * If yes, iter is a copy of the user passed iov_iter
1436 /* asynchronous read support */
1437 struct cifs_readdata {
1438 struct kref refcount;
1439 struct list_head list;
1440 struct completion done;
1441 struct cifsFileInfo *cfile;
1442 struct address_space *mapping;
1443 struct cifs_aio_ctx *ctx;
1449 struct work_struct work;
1450 struct iov_iter iter;
1452 struct TCP_Server_Info *server;
1453 #ifdef CONFIG_CIFS_SMB_DIRECT
1456 struct cifs_credits credits;
1459 /* asynchronous write support */
1460 struct cifs_writedata {
1461 struct kref refcount;
1462 struct list_head list;
1463 struct completion done;
1464 enum writeback_sync_modes sync_mode;
1465 struct work_struct work;
1466 struct cifsFileInfo *cfile;
1467 struct cifs_aio_ctx *ctx;
1468 struct iov_iter iter;
1474 struct TCP_Server_Info *server;
1475 #ifdef CONFIG_CIFS_SMB_DIRECT
1478 struct cifs_credits credits;
1482 * Take a reference on the file private data. Must be called with
1483 * cfile->file_info_lock held.
1486 cifsFileInfo_get_locked(struct cifsFileInfo *cifs_file)
1491 struct cifsFileInfo *cifsFileInfo_get(struct cifsFileInfo *cifs_file);
1492 void _cifsFileInfo_put(struct cifsFileInfo *cifs_file, bool wait_oplock_hdlr,
1494 void cifsFileInfo_put(struct cifsFileInfo *cifs_file);
1496 #define CIFS_CACHE_READ_FLG 1
1497 #define CIFS_CACHE_HANDLE_FLG 2
1498 #define CIFS_CACHE_RH_FLG (CIFS_CACHE_READ_FLG | CIFS_CACHE_HANDLE_FLG)
1499 #define CIFS_CACHE_WRITE_FLG 4
1500 #define CIFS_CACHE_RW_FLG (CIFS_CACHE_READ_FLG | CIFS_CACHE_WRITE_FLG)
1501 #define CIFS_CACHE_RHW_FLG (CIFS_CACHE_RW_FLG | CIFS_CACHE_HANDLE_FLG)
1503 #define CIFS_CACHE_READ(cinode) ((cinode->oplock & CIFS_CACHE_READ_FLG) || (CIFS_SB(cinode->netfs.inode.i_sb)->mnt_cifs_flags & CIFS_MOUNT_RO_CACHE))
1504 #define CIFS_CACHE_HANDLE(cinode) (cinode->oplock & CIFS_CACHE_HANDLE_FLG)
1505 #define CIFS_CACHE_WRITE(cinode) ((cinode->oplock & CIFS_CACHE_WRITE_FLG) || (CIFS_SB(cinode->netfs.inode.i_sb)->mnt_cifs_flags & CIFS_MOUNT_RW_CACHE))
1508 * One of these for each file inode
1511 struct cifsInodeInfo {
1512 struct netfs_inode netfs; /* Netfslib context and vfs inode */
1513 bool can_cache_brlcks;
1514 struct list_head llist; /* locks helb by this inode */
1516 * NOTE: Some code paths call down_read(lock_sem) twice, so
1517 * we must always use cifs_down_write() instead of down_write()
1518 * for this semaphore to avoid deadlocks.
1520 struct rw_semaphore lock_sem; /* protect the fields above */
1521 /* BB add in lists for dirty pages i.e. write caching info for oplock */
1522 struct list_head openFileList;
1523 spinlock_t open_file_lock; /* protects openFileList */
1524 __u32 cifsAttrs; /* e.g. DOS archive bit, sparse, compressed, system */
1525 unsigned int oplock; /* oplock/lease level we have */
1526 unsigned int epoch; /* used to track lease state changes */
1527 #define CIFS_INODE_PENDING_OPLOCK_BREAK (0) /* oplock break in progress */
1528 #define CIFS_INODE_PENDING_WRITERS (1) /* Writes in progress */
1529 #define CIFS_INODE_FLAG_UNUSED (2) /* Unused flag */
1530 #define CIFS_INO_DELETE_PENDING (3) /* delete pending on server */
1531 #define CIFS_INO_INVALID_MAPPING (4) /* pagecache is invalid */
1532 #define CIFS_INO_LOCK (5) /* lock bit for synchronization */
1533 #define CIFS_INO_MODIFIED_ATTR (6) /* Indicate change in mtime/ctime */
1534 #define CIFS_INO_CLOSE_ON_LOCK (7) /* Not to defer the close when lock is set */
1535 unsigned long flags;
1536 spinlock_t writers_lock;
1537 unsigned int writers; /* Number of writers on this inode */
1538 unsigned long time; /* jiffies of last update of inode */
1539 u64 server_eof; /* current file size on server -- protected by i_lock */
1540 u64 uniqueid; /* server inode number */
1541 u64 createtime; /* creation time on server */
1542 __u8 lease_key[SMB2_LEASE_KEY_SIZE]; /* lease key for this inode */
1543 struct list_head deferred_closes; /* list of deferred closes */
1544 spinlock_t deferred_lock; /* protection on deferred list */
1545 bool lease_granted; /* Flag to indicate whether lease or oplock is granted. */
1546 char *symlink_target;
1549 static inline struct cifsInodeInfo *
1550 CIFS_I(struct inode *inode)
1552 return container_of(inode, struct cifsInodeInfo, netfs.inode);
1555 static inline struct cifs_sb_info *
1556 CIFS_SB(struct super_block *sb)
1558 return sb->s_fs_info;
1561 static inline struct cifs_sb_info *
1562 CIFS_FILE_SB(struct file *file)
1564 return CIFS_SB(file_inode(file)->i_sb);
1567 static inline char CIFS_DIR_SEP(const struct cifs_sb_info *cifs_sb)
1569 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_POSIX_PATHS)
1576 convert_delimiter(char *path, char delim)
1578 char old_delim, *pos;
1586 while ((pos = strchr(pos, old_delim)))
1590 #define cifs_stats_inc atomic_inc
1592 static inline void cifs_stats_bytes_written(struct cifs_tcon *tcon,
1596 spin_lock(&tcon->stat_lock);
1597 tcon->bytes_written += bytes;
1598 spin_unlock(&tcon->stat_lock);
1602 static inline void cifs_stats_bytes_read(struct cifs_tcon *tcon,
1605 spin_lock(&tcon->stat_lock);
1606 tcon->bytes_read += bytes;
1607 spin_unlock(&tcon->stat_lock);
1612 * This is the prototype for the mid receive function. This function is for
1613 * receiving the rest of the SMB frame, starting with the WordCount (which is
1614 * just after the MID in struct smb_hdr). Note:
1616 * - This will be called by cifsd, with no locks held.
1617 * - The mid will still be on the pending_mid_q.
1618 * - mid->resp_buf will point to the current buffer.
1620 * Returns zero on a successful receive, or an error. The receive state in
1621 * the TCP_Server_Info will also be updated.
1623 typedef int (mid_receive_t)(struct TCP_Server_Info *server,
1624 struct mid_q_entry *mid);
1627 * This is the prototype for the mid callback function. This is called once the
1628 * mid has been received off of the socket. When creating one, take special
1629 * care to avoid deadlocks. Things to bear in mind:
1631 * - it will be called by cifsd, with no locks held
1632 * - the mid will be removed from any lists
1634 typedef void (mid_callback_t)(struct mid_q_entry *mid);
1637 * This is the protopyte for mid handle function. This is called once the mid
1638 * has been recognized after decryption of the message.
1640 typedef int (mid_handle_t)(struct TCP_Server_Info *server,
1641 struct mid_q_entry *mid);
1643 /* one of these for every pending CIFS request to the server */
1644 struct mid_q_entry {
1645 struct list_head qhead; /* mids waiting on reply from this server */
1646 struct kref refcount;
1647 struct TCP_Server_Info *server; /* server corresponding to this mid */
1648 __u64 mid; /* multiplex id */
1649 __u16 credits; /* number of credits consumed by this mid */
1650 __u16 credits_received; /* number of credits from the response */
1651 __u32 pid; /* process id */
1652 __u32 sequence_number; /* for CIFS signing */
1653 unsigned long when_alloc; /* when mid was created */
1654 #ifdef CONFIG_CIFS_STATS2
1655 unsigned long when_sent; /* time when smb send finished */
1656 unsigned long when_received; /* when demux complete (taken off wire) */
1658 mid_receive_t *receive; /* call receive callback */
1659 mid_callback_t *callback; /* call completion callback */
1660 mid_handle_t *handle; /* call handle mid callback */
1661 void *callback_data; /* general purpose pointer for callback */
1662 struct task_struct *creator;
1663 void *resp_buf; /* pointer to received SMB header */
1664 unsigned int resp_buf_size;
1665 int mid_state; /* wish this were enum but can not pass to wait_event */
1666 unsigned int mid_flags;
1667 __le16 command; /* smb command code */
1668 unsigned int optype; /* operation type */
1669 bool large_buf:1; /* if valid response, is pointer to large buf */
1670 bool multiRsp:1; /* multiple trans2 responses for one request */
1671 bool multiEnd:1; /* both received */
1672 bool decrypted:1; /* decrypted entry */
1675 struct close_cancelled_open {
1676 struct cifs_fid fid;
1677 struct cifs_tcon *tcon;
1678 struct work_struct work;
1683 /* Make code in transport.c a little cleaner by moving
1684 update of optional stats into function below */
1685 static inline void cifs_in_send_inc(struct TCP_Server_Info *server)
1687 atomic_inc(&server->in_send);
1690 static inline void cifs_in_send_dec(struct TCP_Server_Info *server)
1692 atomic_dec(&server->in_send);
1695 static inline void cifs_num_waiters_inc(struct TCP_Server_Info *server)
1697 atomic_inc(&server->num_waiters);
1700 static inline void cifs_num_waiters_dec(struct TCP_Server_Info *server)
1702 atomic_dec(&server->num_waiters);
1705 #ifdef CONFIG_CIFS_STATS2
1706 static inline void cifs_save_when_sent(struct mid_q_entry *mid)
1708 mid->when_sent = jiffies;
1711 static inline void cifs_save_when_sent(struct mid_q_entry *mid)
1716 /* for pending dnotify requests */
1717 struct dir_notify_req {
1718 struct list_head lhead;
1725 __u32 filter; /* CompletionFilter (for multishot) */
1730 struct dfs_info3_param {
1731 int flags; /* DFSREF_REFERRAL_SERVER, DFSREF_STORAGE_SERVER*/
1741 struct list_head list;
1742 struct cifsFileInfo *cfile;
1745 struct cifs_mount_ctx {
1746 struct cifs_sb_info *cifs_sb;
1747 struct smb3_fs_context *fs_ctx;
1749 struct TCP_Server_Info *server;
1750 struct cifs_ses *ses;
1751 struct cifs_tcon *tcon;
1752 struct list_head dfs_ses_list;
1755 static inline void __free_dfs_info_param(struct dfs_info3_param *param)
1757 kfree(param->path_name);
1758 kfree(param->node_name);
1761 static inline void free_dfs_info_param(struct dfs_info3_param *param)
1764 __free_dfs_info_param(param);
1767 static inline void zfree_dfs_info_param(struct dfs_info3_param *param)
1770 __free_dfs_info_param(param);
1771 memset(param, 0, sizeof(*param));
1775 static inline void free_dfs_info_array(struct dfs_info3_param *param,
1776 int number_of_items)
1780 if ((number_of_items == 0) || (param == NULL))
1782 for (i = 0; i < number_of_items; i++) {
1783 kfree(param[i].path_name);
1784 kfree(param[i].node_name);
1789 static inline bool is_interrupt_error(int error)
1794 case -ERESTARTNOHAND:
1795 case -ERESTARTNOINTR:
1801 static inline bool is_retryable_error(int error)
1803 if (is_interrupt_error(error) || error == -EAGAIN)
1809 /* cifs_get_writable_file() flags */
1810 #define FIND_WR_ANY 0
1811 #define FIND_WR_FSUID_ONLY 1
1812 #define FIND_WR_WITH_DELETE 2
1815 #define MID_REQUEST_ALLOCATED 1
1816 #define MID_REQUEST_SUBMITTED 2
1817 #define MID_RESPONSE_RECEIVED 4
1818 #define MID_RETRY_NEEDED 8 /* session closed while this request out */
1819 #define MID_RESPONSE_MALFORMED 0x10
1820 #define MID_SHUTDOWN 0x20
1821 #define MID_RESPONSE_READY 0x40 /* ready for other process handle the rsp */
1824 #define MID_WAIT_CANCELLED 1 /* Cancelled while waiting for response */
1825 #define MID_DELETED 2 /* Mid has been dequeued/deleted */
1827 /* Types of response buffer returned from SendReceive2 */
1828 #define CIFS_NO_BUFFER 0 /* Response buffer not returned */
1829 #define CIFS_SMALL_BUFFER 1
1830 #define CIFS_LARGE_BUFFER 2
1831 #define CIFS_IOVEC 4 /* array of response buffers */
1833 /* Type of Request to SendReceive2 */
1834 #define CIFS_BLOCKING_OP 1 /* operation can block */
1835 #define CIFS_NON_BLOCKING 2 /* do not block waiting for credits */
1836 #define CIFS_TIMEOUT_MASK 0x003 /* only one of above set in req */
1837 #define CIFS_LOG_ERROR 0x010 /* log NT STATUS if non-zero */
1838 #define CIFS_LARGE_BUF_OP 0x020 /* large request buffer */
1839 #define CIFS_NO_RSP_BUF 0x040 /* no response buffer required */
1841 /* Type of request operation */
1842 #define CIFS_ECHO_OP 0x080 /* echo request */
1843 #define CIFS_OBREAK_OP 0x0100 /* oplock break request */
1844 #define CIFS_NEG_OP 0x0200 /* negotiate request */
1845 #define CIFS_CP_CREATE_CLOSE_OP 0x0400 /* compound create+close request */
1846 /* Lower bitmask values are reserved by others below. */
1847 #define CIFS_SESS_OP 0x2000 /* session setup request */
1848 #define CIFS_OP_MASK 0x2780 /* mask request type */
1850 #define CIFS_HAS_CREDITS 0x0400 /* already has credits */
1851 #define CIFS_TRANSFORM_REQ 0x0800 /* transform request before sending */
1852 #define CIFS_NO_SRV_RSP 0x1000 /* there is no server response */
1854 /* Security Flags: indicate type of session setup needed */
1855 #define CIFSSEC_MAY_SIGN 0x00001
1856 #define CIFSSEC_MAY_NTLMV2 0x00004
1857 #define CIFSSEC_MAY_KRB5 0x00008
1858 #define CIFSSEC_MAY_SEAL 0x00040 /* not supported yet */
1859 #define CIFSSEC_MAY_NTLMSSP 0x00080 /* raw ntlmssp with ntlmv2 */
1861 #define CIFSSEC_MUST_SIGN 0x01001
1862 /* note that only one of the following can be set so the
1863 result of setting MUST flags more than once will be to
1864 require use of the stronger protocol */
1865 #define CIFSSEC_MUST_NTLMV2 0x04004
1866 #define CIFSSEC_MUST_KRB5 0x08008
1867 #ifdef CONFIG_CIFS_UPCALL
1868 #define CIFSSEC_MASK 0x8F08F /* flags supported if no weak allowed */
1870 #define CIFSSEC_MASK 0x87087 /* flags supported if no weak allowed */
1872 #define CIFSSEC_MUST_SEAL 0x40040 /* not supported yet */
1873 #define CIFSSEC_MUST_NTLMSSP 0x80080 /* raw ntlmssp with ntlmv2 */
1875 #define CIFSSEC_DEF (CIFSSEC_MAY_SIGN | CIFSSEC_MAY_NTLMV2 | CIFSSEC_MAY_NTLMSSP)
1876 #define CIFSSEC_MAX (CIFSSEC_MUST_NTLMV2)
1877 #define CIFSSEC_AUTH_MASK (CIFSSEC_MAY_NTLMV2 | CIFSSEC_MAY_KRB5 | CIFSSEC_MAY_NTLMSSP)
1879 *****************************************************************
1880 * All constants go here
1881 *****************************************************************
1884 #define UID_HASH (16)
1887 * Note that ONE module should define _DECLARE_GLOBALS_HERE to cause the
1888 * following to be declared.
1891 /****************************************************************************
1892 * Here are all the locks (spinlock, mutex, semaphore) in cifs.ko, arranged according
1893 * to the locking order. i.e. if two locks are to be held together, the lock that
1894 * appears higher in this list needs to be taken before the other.
1896 * If you hold a lock that is lower in this list, and you need to take a higher lock
1897 * (or if you think that one of the functions that you're calling may need to), first
1898 * drop the lock you hold, pick up the higher lock, then the lower one. This will
1899 * ensure that locks are picked up only in one direction in the below table
1902 * Also, if you expect a function to be called with a lock held, explicitly document
1903 * this in the comments on top of your function definition.
1905 * And also, try to keep the critical sections (lock hold time) to be as minimal as
1906 * possible. Blocking / calling other functions with a lock held always increase
1907 * the risk of a possible deadlock.
1909 * Following this rule will avoid unnecessary deadlocks, which can get really hard to
1910 * debug. Also, any new lock that you introduce, please add to this list in the correct
1913 * Please populate this list whenever you introduce new locks in your changes. Or in
1914 * case I've missed some existing locks. Please ensure that it's added in the list
1915 * based on the locking order expected.
1917 * =====================================================================================
1918 * Lock Protects Initialization fn
1919 * =====================================================================================
1921 * vol_info->ctx_lock vol_info->ctx
1922 * cifs_sb_info->tlink_tree_lock cifs_sb_info->tlink_tree cifs_setup_cifs_sb
1923 * TCP_Server_Info-> TCP_Server_Info cifs_get_tcp_session
1925 * TCP_Server_Info->srv_mutex TCP_Server_Info cifs_get_tcp_session
1926 * cifs_ses->session_mutex cifs_ses sesInfoAlloc
1928 * cifs_tcon->open_file_lock cifs_tcon->openFileList tconInfoAlloc
1929 * cifs_tcon->pending_opens
1930 * cifs_tcon->stat_lock cifs_tcon->bytes_read tconInfoAlloc
1931 * cifs_tcon->bytes_written
1932 * cifs_tcp_ses_lock cifs_tcp_ses_list sesInfoAlloc
1933 * GlobalMid_Lock GlobalMaxActiveXid init_cifs
1935 * GlobalTotalActiveXid
1936 * TCP_Server_Info->srv_lock (anything in struct not protected by another lock and can change)
1937 * TCP_Server_Info->mid_lock TCP_Server_Info->pending_mid_q cifs_get_tcp_session
1939 * (any changes in mid_q_entry fields)
1940 * TCP_Server_Info->req_lock TCP_Server_Info->in_flight cifs_get_tcp_session
1944 * ->reconnect_instance
1945 * cifs_ses->ses_lock (anything that is not protected by another lock and can change)
1946 * cifs_ses->iface_lock cifs_ses->iface_list sesInfoAlloc
1948 * ->iface_last_update
1949 * cifs_ses->chan_lock cifs_ses->chans
1950 * ->chans_need_reconnect
1951 * ->chans_in_reconnect
1952 * cifs_tcon->tc_lock (anything that is not protected by another lock and can change)
1953 * cifsInodeInfo->open_file_lock cifsInodeInfo->openFileList cifs_alloc_inode
1954 * cifsInodeInfo->writers_lock cifsInodeInfo->writers cifsInodeInfo_alloc
1955 * cifsInodeInfo->lock_sem cifsInodeInfo->llist cifs_init_once
1956 * ->can_cache_brlcks
1957 * cifsInodeInfo->deferred_lock cifsInodeInfo->deferred_closes cifsInodeInfo_alloc
1958 * cached_fid->fid_mutex cifs_tcon->crfid tcon_info_alloc
1959 * cifsFileInfo->fh_mutex cifsFileInfo cifs_new_fileinfo
1960 * cifsFileInfo->file_info_lock cifsFileInfo->count cifs_new_fileinfo
1961 * ->invalidHandle initiate_cifs_search
1962 * ->oplock_break_cancelled
1963 * cifs_aio_ctx->aio_mutex cifs_aio_ctx cifs_aio_ctx_alloc
1964 ****************************************************************************/
1966 #ifdef DECLARE_GLOBALS_HERE
1967 #define GLOBAL_EXTERN
1969 #define GLOBAL_EXTERN extern
1973 * the list of TCP_Server_Info structures, ie each of the sockets
1974 * connecting our client to a distinct server (ip address), is
1975 * chained together by cifs_tcp_ses_list. The list of all our SMB
1976 * sessions (and from that the tree connections) can be found
1977 * by iterating over cifs_tcp_ses_list
1979 extern struct list_head cifs_tcp_ses_list;
1982 * This lock protects the cifs_tcp_ses_list, the list of smb sessions per
1983 * tcp session, and the list of tcon's per smb session. It also protects
1984 * the reference counters for the server, smb session, and tcon.
1985 * generally the locks should be taken in order tcp_ses_lock before
1986 * tcon->open_file_lock and that before file->file_info_lock since the
1987 * structure order is cifs_socket-->cifs_ses-->cifs_tcon-->cifs_file
1989 extern spinlock_t cifs_tcp_ses_lock;
1992 * Global transaction id (XID) information
1994 extern unsigned int GlobalCurrentXid; /* protected by GlobalMid_Sem */
1995 extern unsigned int GlobalTotalActiveXid; /* prot by GlobalMid_Sem */
1996 extern unsigned int GlobalMaxActiveXid; /* prot by GlobalMid_Sem */
1997 extern spinlock_t GlobalMid_Lock; /* protects above & list operations on midQ entries */
2000 * Global counters, updated atomically
2002 extern atomic_t sesInfoAllocCount;
2003 extern atomic_t tconInfoAllocCount;
2004 extern atomic_t tcpSesNextId;
2005 extern atomic_t tcpSesAllocCount;
2006 extern atomic_t tcpSesReconnectCount;
2007 extern atomic_t tconInfoReconnectCount;
2009 /* Various Debug counters */
2010 extern atomic_t buf_alloc_count; /* current number allocated */
2011 extern atomic_t small_buf_alloc_count;
2012 #ifdef CONFIG_CIFS_STATS2
2013 extern atomic_t total_buf_alloc_count; /* total allocated over all time */
2014 extern atomic_t total_small_buf_alloc_count;
2015 extern unsigned int slow_rsp_threshold; /* number of secs before logging */
2019 extern bool enable_oplocks; /* enable or disable oplocks */
2020 extern bool lookupCacheEnabled;
2021 extern unsigned int global_secflags; /* if on, session setup sent
2022 with more secure ntlmssp2 challenge/resp */
2023 extern unsigned int sign_CIFS_PDUs; /* enable smb packet signing */
2024 extern bool enable_gcm_256; /* allow optional negotiate of strongest signing (aes-gcm-256) */
2025 extern bool require_gcm_256; /* require use of strongest signing (aes-gcm-256) */
2026 extern bool enable_negotiate_signing; /* request use of faster (GMAC) signing if available */
2027 extern bool linuxExtEnabled;/*enable Linux/Unix CIFS extensions*/
2028 extern unsigned int CIFSMaxBufSize; /* max size not including hdr */
2029 extern unsigned int cifs_min_rcv; /* min size of big ntwrk buf pool */
2030 extern unsigned int cifs_min_small; /* min size of small buf pool */
2031 extern unsigned int cifs_max_pending; /* MAX requests at once to server*/
2032 extern unsigned int dir_cache_timeout; /* max time for directory lease caching of dir */
2033 extern bool disable_legacy_dialects; /* forbid vers=1.0 and vers=2.0 mounts */
2034 extern atomic_t mid_count;
2036 void cifs_oplock_break(struct work_struct *work);
2037 void cifs_queue_oplock_break(struct cifsFileInfo *cfile);
2038 void smb2_deferred_work_close(struct work_struct *work);
2040 extern const struct slow_work_ops cifs_oplock_break_ops;
2041 extern struct workqueue_struct *cifsiod_wq;
2042 extern struct workqueue_struct *decrypt_wq;
2043 extern struct workqueue_struct *fileinfo_put_wq;
2044 extern struct workqueue_struct *cifsoplockd_wq;
2045 extern struct workqueue_struct *deferredclose_wq;
2046 extern __u32 cifs_lock_secret;
2048 extern mempool_t *cifs_mid_poolp;
2050 /* Operations for different SMB versions */
2051 #define SMB1_VERSION_STRING "1.0"
2052 #define SMB20_VERSION_STRING "2.0"
2053 #ifdef CONFIG_CIFS_ALLOW_INSECURE_LEGACY
2054 extern struct smb_version_operations smb1_operations;
2055 extern struct smb_version_values smb1_values;
2056 extern struct smb_version_operations smb20_operations;
2057 extern struct smb_version_values smb20_values;
2058 #endif /* CIFS_ALLOW_INSECURE_LEGACY */
2059 #define SMB21_VERSION_STRING "2.1"
2060 extern struct smb_version_operations smb21_operations;
2061 extern struct smb_version_values smb21_values;
2062 #define SMBDEFAULT_VERSION_STRING "default"
2063 extern struct smb_version_values smbdefault_values;
2064 #define SMB3ANY_VERSION_STRING "3"
2065 extern struct smb_version_values smb3any_values;
2066 #define SMB30_VERSION_STRING "3.0"
2067 extern struct smb_version_operations smb30_operations;
2068 extern struct smb_version_values smb30_values;
2069 #define SMB302_VERSION_STRING "3.02"
2070 #define ALT_SMB302_VERSION_STRING "3.0.2"
2071 /*extern struct smb_version_operations smb302_operations;*/ /* not needed yet */
2072 extern struct smb_version_values smb302_values;
2073 #define SMB311_VERSION_STRING "3.1.1"
2074 #define ALT_SMB311_VERSION_STRING "3.11"
2075 extern struct smb_version_operations smb311_operations;
2076 extern struct smb_version_values smb311_values;
2078 static inline char *get_security_type_str(enum securityEnum sectype)
2082 return "RawNTLMSSP";
2092 static inline bool is_smb1_server(struct TCP_Server_Info *server)
2094 return strcmp(server->vals->version_string, SMB1_VERSION_STRING) == 0;
2097 static inline bool is_tcon_dfs(struct cifs_tcon *tcon)
2100 * For SMB1, see MS-CIFS 2.4.55 SMB_COM_TREE_CONNECT_ANDX (0x75) and MS-CIFS 3.3.4.4 DFS
2101 * Subsystem Notifies That a Share Is a DFS Share.
2103 * For SMB2+, see MS-SMB2 2.2.10 SMB2 TREE_CONNECT Response and MS-SMB2 3.3.4.14 Server
2104 * Application Updates a Share.
2106 if (!tcon || !tcon->ses || !tcon->ses->server)
2108 return is_smb1_server(tcon->ses->server) ? tcon->Flags & SMB_SHARE_IS_IN_DFS :
2109 tcon->share_flags & (SHI1005_FLAGS_DFS | SHI1005_FLAGS_DFS_ROOT);
2112 static inline bool cifs_is_referral_server(struct cifs_tcon *tcon,
2113 const struct dfs_info3_param *ref)
2116 * Check if all targets are capable of handling DFS referrals as per
2117 * MS-DFSC 2.2.4 RESP_GET_DFS_REFERRAL.
2119 return is_tcon_dfs(tcon) || (ref && (ref->flags & DFSREF_REFERRAL_SERVER));
2122 static inline u64 cifs_flock_len(const struct file_lock *fl)
2124 return (u64)fl->fl_end - fl->fl_start + 1;
2127 static inline size_t ntlmssp_workstation_name_size(const struct cifs_ses *ses)
2129 if (WARN_ON_ONCE(!ses || !ses->server))
2132 * Make workstation name no more than 15 chars when using insecure dialects as some legacy
2133 * servers do require it during NTLMSSP.
2135 if (ses->server->dialect <= SMB20_PROT_ID)
2136 return min_t(size_t, sizeof(ses->workstation_name), RFC1001_NAME_LEN_WITH_NULL);
2137 return sizeof(ses->workstation_name);
2140 static inline void move_cifs_info_to_smb2(struct smb2_file_all_info *dst, const FILE_ALL_INFO *src)
2142 memcpy(dst, src, (size_t)((u8 *)&src->AccessFlags - (u8 *)src));
2143 dst->AccessFlags = src->AccessFlags;
2144 dst->CurrentByteOffset = src->CurrentByteOffset;
2145 dst->Mode = src->Mode;
2146 dst->AlignmentRequirement = src->AlignmentRequirement;
2147 dst->FileNameLength = src->FileNameLength;
2150 static inline int cifs_get_num_sgs(const struct smb_rqst *rqst,
2154 unsigned int len, skip;
2155 unsigned int nents = 0;
2161 * The first rqst has a transform header where the first 20 bytes are
2162 * not part of the encrypted blob.
2166 /* Assumes the first rqst has a transform header as the first iov.
2168 * rqst[0].rq_iov[0] is transform header
2169 * rqst[0].rq_iov[1+] data to be encrypted/decrypted
2170 * rqst[1+].rq_iov[0+] data to be encrypted/decrypted
2172 for (i = 0; i < num_rqst; i++) {
2173 data_size = iov_iter_count(&rqst[i].rq_iter);
2175 /* We really don't want a mixture of pinned and unpinned pages
2176 * in the sglist. It's hard to keep track of which is what.
2177 * Instead, we convert to a BVEC-type iterator higher up.
2180 WARN_ON_ONCE(user_backed_iter(&rqst[i].rq_iter)))
2183 /* We also don't want to have any extra refs or pins to clean
2187 WARN_ON_ONCE(iov_iter_extract_will_pin(&rqst[i].rq_iter)))
2190 for (j = 0; j < rqst[i].rq_nvec; j++) {
2191 struct kvec *iov = &rqst[i].rq_iov[j];
2193 addr = (unsigned long)iov->iov_base + skip;
2194 if (unlikely(is_vmalloc_addr((void *)addr))) {
2195 len = iov->iov_len - skip;
2196 nents += DIV_ROUND_UP(offset_in_page(addr) + len,
2204 nents += iov_iter_npages(&rqst[i].rq_iter, INT_MAX);
2206 nents += DIV_ROUND_UP(offset_in_page(sig) + SMB2_SIGNATURE_SIZE, PAGE_SIZE);
2210 /* We can not use the normal sg_set_buf() as we will sometimes pass a
2211 * stack object as buf.
2213 static inline void cifs_sg_set_buf(struct sg_table *sgtable,
2215 unsigned int buflen)
2217 unsigned long addr = (unsigned long)buf;
2218 unsigned int off = offset_in_page(addr);
2221 if (unlikely(is_vmalloc_addr((void *)addr))) {
2223 unsigned int len = min_t(unsigned int, buflen, PAGE_SIZE - off);
2225 sg_set_page(&sgtable->sgl[sgtable->nents++],
2226 vmalloc_to_page((void *)addr), len, off);
2233 sg_set_page(&sgtable->sgl[sgtable->nents++],
2234 virt_to_page((void *)addr), buflen, off);
2238 struct smb2_compound_vars {
2239 struct cifs_open_parms oparms;
2240 struct kvec rsp_iov[3];
2241 struct smb_rqst rqst[3];
2242 struct kvec open_iov[SMB2_CREATE_IOV_SIZE];
2244 struct kvec io_iov[SMB2_IOCTL_IOV_SIZE];
2245 struct kvec si_iov[SMB2_SET_INFO_IOV_SIZE];
2246 struct kvec close_iov;
2247 struct smb2_file_rename_info rename_info;
2248 struct smb2_file_link_info link_info;
2251 #endif /* _CIFS_GLOB_H */