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 <linux/scatterlist.h>
27 #include <uapi/linux/cifs/cifs_mount.h>
28 #include "../common/smb2pdu.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 /* dns resolution intervals in seconds */
82 #define SMB_DNS_RESOLVE_INTERVAL_MIN 120
83 #define SMB_DNS_RESOLVE_INTERVAL_DEFAULT 600
85 /* smb multichannel query server interfaces interval in seconds */
86 #define SMB_INTERFACE_POLL_INTERVAL 600
88 /* maximum number of PDUs in one compound */
89 #define MAX_COMPOUND 7
92 * Default number of credits to keep available for SMB3.
93 * This value is chosen somewhat arbitrarily. The Windows client
94 * defaults to 128 credits, the Windows server allows clients up to
95 * 512 credits (or 8K for later versions), and the NetApp server
96 * does not limit clients at all. Choose a high enough default value
97 * such that the client shouldn't limit performance, but allow mount
98 * to override (until you approach 64K, where we limit credits to 65000
99 * to reduce possibility of seeing more server credit overflow bugs.
101 #define SMB2_MAX_CREDITS_AVAILABLE 32000
105 #ifndef XATTR_DOS_ATTRIB
106 #define XATTR_DOS_ATTRIB "user.DOSATTRIB"
109 #define CIFS_MAX_WORKSTATION_LEN (__NEW_UTS_LEN + 1) /* reasonable max for client */
112 * CIFS vfs client Status information (based on what we know.)
115 /* associated with each connection */
125 /* associated with each smb session */
126 enum ses_status_enum {
134 /* associated with each tree connection to the server */
135 enum tid_status_enum {
142 TID_NEED_FILES_INVALIDATE, /* currently unused */
143 TID_IN_FILES_INVALIDATE
147 Unspecified = 0, /* not specified */
148 NTLMv2, /* Legacy NTLM auth with NTLMv2 hash */
149 RawNTLMSSP, /* NTLMSSP without SPNEGO, NTLMv2 hash */
150 Kerberos, /* Kerberos via SPNEGO */
158 /* crypto hashing related structure/fields, not specific to a sec mech */
159 struct cifs_secmech {
160 struct shash_desc *hmacmd5; /* hmacmd5 hash function, for NTLMv2/CR1 hashes */
161 struct shash_desc *md5; /* md5 hash function, for CIFS/SMB1 signatures */
162 struct shash_desc *hmacsha256; /* hmac-sha256 hash function, for SMB2 signatures */
163 struct shash_desc *sha512; /* sha512 hash function, for SMB3.1.1 preauth hash */
164 struct shash_desc *aes_cmac; /* block-cipher based MAC function, for SMB3 signatures */
166 struct crypto_aead *enc; /* smb3 encryption AEAD TFM (AES-CCM and AES-GCM) */
167 struct crypto_aead *dec; /* smb3 decryption AEAD TFM (AES-CCM and AES-GCM) */
170 /* per smb session structure/fields */
171 struct ntlmssp_auth {
172 bool sesskey_per_smbsess; /* whether session key is per smb session */
173 __u32 client_flags; /* sent by client in type 1 ntlmsssp exchange */
174 __u32 server_flags; /* sent by server in type 2 ntlmssp exchange */
175 unsigned char ciphertext[CIFS_CPHTXT_SIZE]; /* sent to server */
176 char cryptkey[CIFS_CRYPTO_KEY_SIZE]; /* used by ntlmssp */
184 struct cifs_sid osid;
185 struct cifs_sid gsid;
186 struct cifs_ntace *ntaces;
187 struct cifs_ace *aces;
190 struct cifs_open_info_data {
191 char *symlink_target;
193 struct smb2_file_all_info fi;
194 struct smb311_posix_qinfo posix_fi;
198 static inline void cifs_free_open_info(struct cifs_open_info_data *data)
200 kfree(data->symlink_target);
204 *****************************************************************
205 * Except the CIFS PDUs themselves all the
206 * globally interesting structs should go here
207 *****************************************************************
211 * A smb_rqst represents a complete request to be issued to a server. It's
212 * formed by a kvec array, followed by an array of pages. Page data is assumed
213 * to start at the beginning of the first page.
216 struct kvec *rq_iov; /* array of kvecs */
217 unsigned int rq_nvec; /* number of kvecs in array */
218 struct page **rq_pages; /* pointer to array of page ptrs */
219 unsigned int rq_offset; /* the offset to the 1st page */
220 unsigned int rq_npages; /* number pages in array */
221 unsigned int rq_pagesz; /* page size to use */
222 unsigned int rq_tailsz; /* length of last page */
226 struct TCP_Server_Info;
230 struct dfs_info3_param;
232 struct smb3_fs_context;
234 struct cifs_readdata;
235 struct cifs_writedata;
236 struct cifs_io_parms;
237 struct cifs_search_info;
238 struct cifsInodeInfo;
239 struct cifs_open_parms;
242 struct smb_version_operations {
243 int (*send_cancel)(struct TCP_Server_Info *, struct smb_rqst *,
244 struct mid_q_entry *);
245 bool (*compare_fids)(struct cifsFileInfo *, struct cifsFileInfo *);
246 /* setup request: allocate mid, sign message */
247 struct mid_q_entry *(*setup_request)(struct cifs_ses *,
248 struct TCP_Server_Info *,
250 /* setup async request: allocate mid, sign message */
251 struct mid_q_entry *(*setup_async_request)(struct TCP_Server_Info *,
253 /* check response: verify signature, map error */
254 int (*check_receive)(struct mid_q_entry *, struct TCP_Server_Info *,
256 void (*add_credits)(struct TCP_Server_Info *server,
257 const struct cifs_credits *credits,
259 void (*set_credits)(struct TCP_Server_Info *, const int);
260 int * (*get_credits_field)(struct TCP_Server_Info *, const int);
261 unsigned int (*get_credits)(struct mid_q_entry *);
262 __u64 (*get_next_mid)(struct TCP_Server_Info *);
263 void (*revert_current_mid)(struct TCP_Server_Info *server,
264 const unsigned int val);
265 /* data offset from read response message */
266 unsigned int (*read_data_offset)(char *);
268 * Data length from read response message
269 * When in_remaining is true, the returned data length is in
270 * message field DataRemaining for out-of-band data read (e.g through
271 * Memory Registration RDMA write in SMBD).
272 * Otherwise, the returned data length is in message field DataLength.
274 unsigned int (*read_data_length)(char *, bool in_remaining);
275 /* map smb to linux error */
276 int (*map_error)(char *, bool);
277 /* find mid corresponding to the response message */
278 struct mid_q_entry * (*find_mid)(struct TCP_Server_Info *, char *);
279 void (*dump_detail)(void *buf, struct TCP_Server_Info *ptcp_info);
280 void (*clear_stats)(struct cifs_tcon *);
281 void (*print_stats)(struct seq_file *m, struct cifs_tcon *);
282 void (*dump_share_caps)(struct seq_file *, struct cifs_tcon *);
283 /* verify the message */
284 int (*check_message)(char *, unsigned int, struct TCP_Server_Info *);
285 bool (*is_oplock_break)(char *, struct TCP_Server_Info *);
286 int (*handle_cancelled_mid)(struct mid_q_entry *, struct TCP_Server_Info *);
287 void (*downgrade_oplock)(struct TCP_Server_Info *server,
288 struct cifsInodeInfo *cinode, __u32 oplock,
289 unsigned int epoch, bool *purge_cache);
290 /* process transaction2 response */
291 bool (*check_trans2)(struct mid_q_entry *, struct TCP_Server_Info *,
293 /* check if we need to negotiate */
294 bool (*need_neg)(struct TCP_Server_Info *);
295 /* negotiate to the server */
296 int (*negotiate)(const unsigned int xid,
297 struct cifs_ses *ses,
298 struct TCP_Server_Info *server);
299 /* set negotiated write size */
300 unsigned int (*negotiate_wsize)(struct cifs_tcon *tcon, struct smb3_fs_context *ctx);
301 /* set negotiated read size */
302 unsigned int (*negotiate_rsize)(struct cifs_tcon *tcon, struct smb3_fs_context *ctx);
303 /* setup smb sessionn */
304 int (*sess_setup)(const unsigned int, struct cifs_ses *,
305 struct TCP_Server_Info *server,
306 const struct nls_table *);
307 /* close smb session */
308 int (*logoff)(const unsigned int, struct cifs_ses *);
309 /* connect to a server share */
310 int (*tree_connect)(const unsigned int, struct cifs_ses *, const char *,
311 struct cifs_tcon *, const struct nls_table *);
312 /* close tree connecion */
313 int (*tree_disconnect)(const unsigned int, struct cifs_tcon *);
314 /* get DFS referrals */
315 int (*get_dfs_refer)(const unsigned int, struct cifs_ses *,
316 const char *, struct dfs_info3_param **,
317 unsigned int *, const struct nls_table *, int);
318 /* informational QFS call */
319 void (*qfs_tcon)(const unsigned int, struct cifs_tcon *,
320 struct cifs_sb_info *);
321 /* check if a path is accessible or not */
322 int (*is_path_accessible)(const unsigned int, struct cifs_tcon *,
323 struct cifs_sb_info *, const char *);
324 /* query path data from the server */
325 int (*query_path_info)(const unsigned int xid, struct cifs_tcon *tcon,
326 struct cifs_sb_info *cifs_sb, const char *full_path,
327 struct cifs_open_info_data *data, bool *adjust_tz, bool *reparse);
328 /* query file data from the server */
329 int (*query_file_info)(const unsigned int xid, struct cifs_tcon *tcon,
330 struct cifsFileInfo *cfile, struct cifs_open_info_data *data);
331 /* query reparse tag from srv to determine which type of special file */
332 int (*query_reparse_tag)(const unsigned int xid, struct cifs_tcon *tcon,
333 struct cifs_sb_info *cifs_sb, const char *path,
335 /* get server index number */
336 int (*get_srv_inum)(const unsigned int xid, struct cifs_tcon *tcon,
337 struct cifs_sb_info *cifs_sb, const char *full_path, u64 *uniqueid,
338 struct cifs_open_info_data *data);
339 /* set size by path */
340 int (*set_path_size)(const unsigned int, struct cifs_tcon *,
341 const char *, __u64, struct cifs_sb_info *, bool);
342 /* set size by file handle */
343 int (*set_file_size)(const unsigned int, struct cifs_tcon *,
344 struct cifsFileInfo *, __u64, bool);
346 int (*set_file_info)(struct inode *, const char *, FILE_BASIC_INFO *,
348 int (*set_compression)(const unsigned int, struct cifs_tcon *,
349 struct cifsFileInfo *);
350 /* check if we can send an echo or nor */
351 bool (*can_echo)(struct TCP_Server_Info *);
352 /* send echo request */
353 int (*echo)(struct TCP_Server_Info *);
354 /* create directory */
355 int (*posix_mkdir)(const unsigned int xid, struct inode *inode,
356 umode_t mode, struct cifs_tcon *tcon,
357 const char *full_path,
358 struct cifs_sb_info *cifs_sb);
359 int (*mkdir)(const unsigned int xid, struct inode *inode, umode_t mode,
360 struct cifs_tcon *tcon, const char *name,
361 struct cifs_sb_info *sb);
362 /* set info on created directory */
363 void (*mkdir_setinfo)(struct inode *, const char *,
364 struct cifs_sb_info *, struct cifs_tcon *,
366 /* remove directory */
367 int (*rmdir)(const unsigned int, struct cifs_tcon *, const char *,
368 struct cifs_sb_info *);
370 int (*unlink)(const unsigned int, struct cifs_tcon *, const char *,
371 struct cifs_sb_info *);
372 /* open, rename and delete file */
373 int (*rename_pending_delete)(const char *, struct dentry *,
375 /* send rename request */
376 int (*rename)(const unsigned int, struct cifs_tcon *, const char *,
377 const char *, struct cifs_sb_info *);
378 /* send create hardlink request */
379 int (*create_hardlink)(const unsigned int, struct cifs_tcon *,
380 const char *, const char *,
381 struct cifs_sb_info *);
382 /* query symlink target */
383 int (*query_symlink)(const unsigned int, struct cifs_tcon *,
384 struct cifs_sb_info *, const char *,
386 /* open a file for non-posix mounts */
387 int (*open)(const unsigned int xid, struct cifs_open_parms *oparms, __u32 *oplock,
389 /* set fid protocol-specific info */
390 void (*set_fid)(struct cifsFileInfo *, struct cifs_fid *, __u32);
392 int (*close)(const unsigned int, struct cifs_tcon *,
394 /* close a file, returning file attributes and timestamps */
395 int (*close_getattr)(const unsigned int xid, struct cifs_tcon *tcon,
396 struct cifsFileInfo *pfile_info);
397 /* send a flush request to the server */
398 int (*flush)(const unsigned int, struct cifs_tcon *, struct cifs_fid *);
399 /* async read from the server */
400 int (*async_readv)(struct cifs_readdata *);
401 /* async write to the server */
402 int (*async_writev)(struct cifs_writedata *,
403 void (*release)(struct kref *));
404 /* sync read from the server */
405 int (*sync_read)(const unsigned int, struct cifs_fid *,
406 struct cifs_io_parms *, unsigned int *, char **,
408 /* sync write to the server */
409 int (*sync_write)(const unsigned int, struct cifs_fid *,
410 struct cifs_io_parms *, unsigned int *, struct kvec *,
412 /* open dir, start readdir */
413 int (*query_dir_first)(const unsigned int, struct cifs_tcon *,
414 const char *, struct cifs_sb_info *,
415 struct cifs_fid *, __u16,
416 struct cifs_search_info *);
417 /* continue readdir */
418 int (*query_dir_next)(const unsigned int, struct cifs_tcon *,
420 __u16, struct cifs_search_info *srch_inf);
422 int (*close_dir)(const unsigned int, struct cifs_tcon *,
424 /* calculate a size of SMB message */
425 unsigned int (*calc_smb_size)(void *buf);
426 /* check for STATUS_PENDING and process the response if yes */
427 bool (*is_status_pending)(char *buf, struct TCP_Server_Info *server);
428 /* check for STATUS_NETWORK_SESSION_EXPIRED */
429 bool (*is_session_expired)(char *);
430 /* send oplock break response */
431 int (*oplock_response)(struct cifs_tcon *tcon, __u64 persistent_fid, __u64 volatile_fid,
432 __u16 net_fid, struct cifsInodeInfo *cifs_inode);
433 /* query remote filesystem */
434 int (*queryfs)(const unsigned int, struct cifs_tcon *,
435 struct cifs_sb_info *, struct kstatfs *);
436 /* send mandatory brlock to the server */
437 int (*mand_lock)(const unsigned int, struct cifsFileInfo *, __u64,
438 __u64, __u32, int, int, bool);
439 /* unlock range of mandatory locks */
440 int (*mand_unlock_range)(struct cifsFileInfo *, struct file_lock *,
442 /* push brlocks from the cache to the server */
443 int (*push_mand_locks)(struct cifsFileInfo *);
444 /* get lease key of the inode */
445 void (*get_lease_key)(struct inode *, struct cifs_fid *);
446 /* set lease key of the inode */
447 void (*set_lease_key)(struct inode *, struct cifs_fid *);
448 /* generate new lease key */
449 void (*new_lease_key)(struct cifs_fid *);
450 int (*generate_signingkey)(struct cifs_ses *ses,
451 struct TCP_Server_Info *server);
452 int (*calc_signature)(struct smb_rqst *, struct TCP_Server_Info *,
453 bool allocate_crypto);
454 int (*set_integrity)(const unsigned int, struct cifs_tcon *tcon,
455 struct cifsFileInfo *src_file);
456 int (*enum_snapshots)(const unsigned int xid, struct cifs_tcon *tcon,
457 struct cifsFileInfo *src_file, void __user *);
458 int (*notify)(const unsigned int xid, struct file *pfile,
459 void __user *pbuf, bool return_changes);
460 int (*query_mf_symlink)(unsigned int, struct cifs_tcon *,
461 struct cifs_sb_info *, const unsigned char *,
462 char *, unsigned int *);
463 int (*create_mf_symlink)(unsigned int, struct cifs_tcon *,
464 struct cifs_sb_info *, const unsigned char *,
465 char *, unsigned int *);
466 /* if we can do cache read operations */
467 bool (*is_read_op)(__u32);
468 /* set oplock level for the inode */
469 void (*set_oplock_level)(struct cifsInodeInfo *, __u32, unsigned int,
471 /* create lease context buffer for CREATE request */
472 char * (*create_lease_buf)(u8 *lease_key, u8 oplock);
473 /* parse lease context buffer and return oplock/epoch info */
474 __u8 (*parse_lease_buf)(void *buf, unsigned int *epoch, char *lkey);
475 ssize_t (*copychunk_range)(const unsigned int,
476 struct cifsFileInfo *src_file,
477 struct cifsFileInfo *target_file,
478 u64 src_off, u64 len, u64 dest_off);
479 int (*duplicate_extents)(const unsigned int, struct cifsFileInfo *src,
480 struct cifsFileInfo *target_file, u64 src_off, u64 len,
482 int (*validate_negotiate)(const unsigned int, struct cifs_tcon *);
483 ssize_t (*query_all_EAs)(const unsigned int, struct cifs_tcon *,
484 const unsigned char *, const unsigned char *, char *,
485 size_t, struct cifs_sb_info *);
486 int (*set_EA)(const unsigned int, struct cifs_tcon *, const char *,
487 const char *, const void *, const __u16,
488 const struct nls_table *, struct cifs_sb_info *);
489 struct cifs_ntsd * (*get_acl)(struct cifs_sb_info *, struct inode *,
490 const char *, u32 *, u32);
491 struct cifs_ntsd * (*get_acl_by_fid)(struct cifs_sb_info *,
492 const struct cifs_fid *, u32 *, u32);
493 int (*set_acl)(struct cifs_ntsd *, __u32, struct inode *, const char *,
495 /* writepages retry size */
496 unsigned int (*wp_retry_size)(struct inode *);
497 /* get mtu credits */
498 int (*wait_mtu_credits)(struct TCP_Server_Info *, unsigned int,
499 unsigned int *, struct cifs_credits *);
500 /* adjust previously taken mtu credits to request size */
501 int (*adjust_credits)(struct TCP_Server_Info *server,
502 struct cifs_credits *credits,
503 const unsigned int payload_size);
504 /* check if we need to issue closedir */
505 bool (*dir_needs_close)(struct cifsFileInfo *);
506 long (*fallocate)(struct file *, struct cifs_tcon *, int, loff_t,
508 /* init transform request - used for encryption for now */
509 int (*init_transform_rq)(struct TCP_Server_Info *, int num_rqst,
510 struct smb_rqst *, struct smb_rqst *);
511 int (*is_transform_hdr)(void *buf);
512 int (*receive_transform)(struct TCP_Server_Info *,
513 struct mid_q_entry **, char **, int *);
514 enum securityEnum (*select_sectype)(struct TCP_Server_Info *,
516 int (*next_header)(struct TCP_Server_Info *server, char *buf,
518 /* ioctl passthrough for query_info */
519 int (*ioctl_query_info)(const unsigned int xid,
520 struct cifs_tcon *tcon,
521 struct cifs_sb_info *cifs_sb,
522 __le16 *path, int is_dir,
524 /* make unix special files (block, char, fifo, socket) */
525 int (*make_node)(unsigned int xid,
527 struct dentry *dentry,
528 struct cifs_tcon *tcon,
529 const char *full_path,
531 dev_t device_number);
532 /* version specific fiemap implementation */
533 int (*fiemap)(struct cifs_tcon *tcon, struct cifsFileInfo *,
534 struct fiemap_extent_info *, u64, u64);
535 /* version specific llseek implementation */
536 loff_t (*llseek)(struct file *, struct cifs_tcon *, loff_t, int);
537 /* Check for STATUS_IO_TIMEOUT */
538 bool (*is_status_io_timeout)(char *buf);
539 /* Check for STATUS_NETWORK_NAME_DELETED */
540 void (*is_network_name_deleted)(char *buf, struct TCP_Server_Info *srv);
543 struct smb_version_values {
544 char *version_string;
546 __u32 req_capabilities;
547 __u32 large_lock_type;
548 __u32 exclusive_lock_type;
549 __u32 shared_lock_type;
550 __u32 unlock_lock_type;
551 size_t header_preamble_size;
553 size_t max_header_size;
554 size_t read_rsp_size;
556 unsigned int cap_unix;
557 unsigned int cap_nt_find;
558 unsigned int cap_large_files;
559 __u16 signing_enabled;
560 __u16 signing_required;
561 size_t create_lease_size;
564 #define HEADER_SIZE(server) (server->vals->header_size)
565 #define MAX_HEADER_SIZE(server) (server->vals->max_header_size)
566 #define HEADER_PREAMBLE_SIZE(server) (server->vals->header_preamble_size)
567 #define MID_HEADER_SIZE(server) (HEADER_SIZE(server) - 1 - HEADER_PREAMBLE_SIZE(server))
570 * CIFS superblock mount flags (mnt_cifs_flags) to consider when
571 * trying to reuse existing superblock for a new mount
573 #define CIFS_MOUNT_MASK (CIFS_MOUNT_NO_PERM | CIFS_MOUNT_SET_UID | \
574 CIFS_MOUNT_SERVER_INUM | CIFS_MOUNT_DIRECT_IO | \
575 CIFS_MOUNT_NO_XATTR | CIFS_MOUNT_MAP_SPECIAL_CHR | \
576 CIFS_MOUNT_MAP_SFM_CHR | \
577 CIFS_MOUNT_UNX_EMUL | CIFS_MOUNT_NO_BRL | \
578 CIFS_MOUNT_CIFS_ACL | CIFS_MOUNT_OVERR_UID | \
579 CIFS_MOUNT_OVERR_GID | CIFS_MOUNT_DYNPERM | \
580 CIFS_MOUNT_NOPOSIXBRL | CIFS_MOUNT_NOSSYNC | \
581 CIFS_MOUNT_FSCACHE | CIFS_MOUNT_MF_SYMLINKS | \
582 CIFS_MOUNT_MULTIUSER | CIFS_MOUNT_STRICT_IO | \
583 CIFS_MOUNT_CIFS_BACKUPUID | CIFS_MOUNT_CIFS_BACKUPGID | \
584 CIFS_MOUNT_UID_FROM_ACL | CIFS_MOUNT_NO_HANDLE_CACHE | \
585 CIFS_MOUNT_NO_DFS | CIFS_MOUNT_MODE_FROM_SID | \
586 CIFS_MOUNT_RO_CACHE | CIFS_MOUNT_RW_CACHE)
589 * Generic VFS superblock mount flags (s_flags) to consider when
590 * trying to reuse existing superblock for a new mount
592 #define CIFS_MS_MASK (SB_RDONLY | SB_MANDLOCK | SB_NOEXEC | SB_NOSUID | \
593 SB_NODEV | SB_SYNCHRONOUS)
595 struct cifs_mnt_data {
596 struct cifs_sb_info *cifs_sb;
597 struct smb3_fs_context *ctx;
601 static inline unsigned int
602 get_rfc1002_length(void *buf)
604 return be32_to_cpu(*((__be32 *)buf)) & 0xffffff;
608 inc_rfc1001_len(void *buf, int count)
610 be32_add_cpu((__be32 *)buf, count);
613 struct TCP_Server_Info {
614 struct list_head tcp_ses_list;
615 struct list_head smb_ses_list;
616 spinlock_t srv_lock; /* protect anything here that is not protected */
617 __u64 conn_id; /* connection identifier (useful for debugging) */
618 int srv_count; /* reference counter */
619 /* 15 character server name + 0x20 16th byte indicating type = srv */
620 char server_RFC1001_name[RFC1001_NAME_LEN_WITH_NULL];
621 struct smb_version_operations *ops;
622 struct smb_version_values *vals;
623 /* updates to tcpStatus protected by cifs_tcp_ses_lock */
624 enum statusEnum tcpStatus; /* what we think the status is */
625 char *hostname; /* hostname portion of UNC string */
626 struct socket *ssocket;
627 struct sockaddr_storage dstaddr;
628 struct sockaddr_storage srcaddr; /* locally bind to this IP */
632 wait_queue_head_t response_q;
633 wait_queue_head_t request_q; /* if more than maxmpx to srvr must block*/
634 spinlock_t mid_lock; /* protect mid queue and it's entries */
635 struct list_head pending_mid_q;
636 bool noblocksnd; /* use blocking sendmsg */
637 bool noautotune; /* do not autotune send buf sizes */
640 unsigned int credits; /* send no more requests at once */
641 unsigned int max_credits; /* can override large 32000 default at mnt */
642 unsigned int in_flight; /* number of requests on the wire to server */
643 unsigned int max_in_flight; /* max number of requests that were on wire */
644 spinlock_t req_lock; /* protect the two values above */
645 struct mutex _srv_mutex;
646 unsigned int nofs_flag;
647 struct task_struct *tsk;
648 char server_GUID[16];
650 bool sign; /* is signing enabled on this connection? */
651 bool ignore_signature:1; /* skip validation of signatures in SMB2/3 rsp */
652 bool session_estab; /* mark when very first sess is established */
653 int echo_credits; /* echo reserved slots */
654 int oplock_credits; /* oplock break reserved slots */
655 bool echoes:1; /* enable echoes */
656 __u8 client_guid[SMB2_CLIENT_GUID_SIZE]; /* Client GUID */
657 u16 dialect; /* dialect index that server chose */
658 bool oplocks:1; /* enable oplocks */
659 unsigned int maxReq; /* Clients should submit no more */
660 /* than maxReq distinct unanswered SMBs to the server when using */
661 /* multiplexed reads or writes (for SMB1/CIFS only, not SMB2/SMB3) */
662 unsigned int maxBuf; /* maxBuf specifies the maximum */
663 /* message size the server can send or receive for non-raw SMBs */
664 /* maxBuf is returned by SMB NegotiateProtocol so maxBuf is only 0 */
665 /* when socket is setup (and during reconnect) before NegProt sent */
666 unsigned int max_rw; /* maxRw specifies the maximum */
667 /* message size the server can send or receive for */
668 /* SMB_COM_WRITE_RAW or SMB_COM_READ_RAW. */
669 unsigned int capabilities; /* selective disabling of caps by smb sess */
670 int timeAdj; /* Adjust for difference in server time zone in sec */
671 __u64 CurrentMid; /* multiplex id - rotating counter, protected by GlobalMid_Lock */
672 char cryptkey[CIFS_CRYPTO_KEY_SIZE]; /* used by ntlm, ntlmv2 etc */
673 /* 16th byte of RFC1001 workstation name is always null */
674 char workstation_RFC1001_name[RFC1001_NAME_LEN_WITH_NULL];
675 __u32 sequence_number; /* for signing, protected by srv_mutex */
676 __u32 reconnect_instance; /* incremented on each reconnect */
677 struct session_key session_key;
678 unsigned long lstrp; /* when we got last response from this server */
679 struct cifs_secmech secmech; /* crypto sec mech functs, descriptors */
680 #define CIFS_NEGFLAVOR_UNENCAP 1 /* wct == 17, but no ext_sec */
681 #define CIFS_NEGFLAVOR_EXTENDED 2 /* wct == 17, ext_sec bit set */
682 char negflavor; /* NEGOTIATE response flavor */
683 /* extended security flavors that server supports */
684 bool sec_ntlmssp; /* supports NTLMSSP */
685 bool sec_kerberosu2u; /* supports U2U Kerberos */
686 bool sec_kerberos; /* supports plain Kerberos */
687 bool sec_mskerberos; /* supports legacy MS Kerberos */
688 bool large_buf; /* is current buffer large? */
689 /* use SMBD connection instead of socket */
691 /* point to the SMBD connection if RDMA is used instead of socket */
692 struct smbd_connection *smbd_conn;
693 struct delayed_work echo; /* echo ping workqueue job */
694 struct delayed_work resolve; /* dns resolution workqueue job */
695 char *smallbuf; /* pointer to current "small" buffer */
696 char *bigbuf; /* pointer to current "big" buffer */
697 /* Total size of this PDU. Only valid from cifs_demultiplex_thread */
698 unsigned int pdu_size;
699 unsigned int total_read; /* total amount of data read in this pass */
700 atomic_t in_send; /* requests trying to send */
701 atomic_t num_waiters; /* blocked waiting to get in sendrecv */
702 #ifdef CONFIG_CIFS_STATS2
703 atomic_t num_cmds[NUMBER_OF_SMB2_COMMANDS]; /* total requests by cmd */
704 atomic_t smb2slowcmd[NUMBER_OF_SMB2_COMMANDS]; /* count resps > 1 sec */
705 __u64 time_per_cmd[NUMBER_OF_SMB2_COMMANDS]; /* total time per cmd */
706 __u32 slowest_cmd[NUMBER_OF_SMB2_COMMANDS];
707 __u32 fastest_cmd[NUMBER_OF_SMB2_COMMANDS];
709 unsigned int max_read;
710 unsigned int max_write;
711 unsigned int min_offload;
712 __le16 compress_algorithm;
713 __u16 signing_algorithm;
715 /* save initital negprot hash */
716 __u8 preauth_sha_hash[SMB2_PREAUTH_HASH_SIZE];
717 bool signing_negotiated; /* true if valid signing context rcvd from server */
718 bool posix_ext_supported;
719 struct delayed_work reconnect; /* reconnect workqueue job */
720 struct mutex reconnect_mutex; /* prevent simultaneous reconnects */
721 unsigned long echo_interval;
724 * Number of targets available for reconnect. The more targets
725 * the more tasks have to wait to let the demultiplex thread
729 bool noblockcnt; /* use non-blocking connect() */
732 * If this is a session channel,
733 * primary_server holds the ref-counted
734 * pointer to primary channel connection for the session.
736 #define CIFS_SERVER_IS_CHAN(server) (!!(server)->primary_server)
737 struct TCP_Server_Info *primary_server;
738 __u16 channel_sequence_num; /* incremented on primary channel on each chan reconnect */
740 #ifdef CONFIG_CIFS_SWN_UPCALL
741 bool use_swn_dstaddr;
742 struct sockaddr_storage swn_dstaddr;
744 #ifdef CONFIG_CIFS_DFS_UPCALL
745 bool is_dfs_conn; /* if a dfs connection */
746 struct mutex refpath_lock; /* protects leaf_fullpath */
748 * Canonical DFS full paths that were used to chase referrals in mount and reconnect.
750 * origin_fullpath: first or original referral path
751 * leaf_fullpath: last referral path (might be changed due to nested links in reconnect)
753 * current_fullpath: pointer to either origin_fullpath or leaf_fullpath
754 * NOTE: cannot be accessed outside cifs_reconnect() and smb2_reconnect()
756 * format: \\HOST\SHARE\[OPTIONAL PATH]
758 char *origin_fullpath, *leaf_fullpath, *current_fullpath;
762 static inline bool is_smb1(struct TCP_Server_Info *server)
764 return HEADER_PREAMBLE_SIZE(server) != 0;
767 static inline void cifs_server_lock(struct TCP_Server_Info *server)
769 unsigned int nofs_flag = memalloc_nofs_save();
771 mutex_lock(&server->_srv_mutex);
772 server->nofs_flag = nofs_flag;
775 static inline void cifs_server_unlock(struct TCP_Server_Info *server)
777 unsigned int nofs_flag = server->nofs_flag;
779 mutex_unlock(&server->_srv_mutex);
780 memalloc_nofs_restore(nofs_flag);
783 struct cifs_credits {
785 unsigned int instance;
788 static inline unsigned int
789 in_flight(struct TCP_Server_Info *server)
793 spin_lock(&server->req_lock);
794 num = server->in_flight;
795 spin_unlock(&server->req_lock);
800 has_credits(struct TCP_Server_Info *server, int *credits, int num_credits)
804 spin_lock(&server->req_lock);
806 spin_unlock(&server->req_lock);
807 return num >= num_credits;
811 add_credits(struct TCP_Server_Info *server, const struct cifs_credits *credits,
814 server->ops->add_credits(server, credits, optype);
818 add_credits_and_wake_if(struct TCP_Server_Info *server,
819 const struct cifs_credits *credits, const int optype)
821 if (credits->value) {
822 server->ops->add_credits(server, credits, optype);
823 wake_up(&server->request_q);
828 set_credits(struct TCP_Server_Info *server, const int val)
830 server->ops->set_credits(server, val);
834 adjust_credits(struct TCP_Server_Info *server, struct cifs_credits *credits,
835 const unsigned int payload_size)
837 return server->ops->adjust_credits ?
838 server->ops->adjust_credits(server, credits, payload_size) : 0;
842 get_next_mid64(struct TCP_Server_Info *server)
844 return cpu_to_le64(server->ops->get_next_mid(server));
848 get_next_mid(struct TCP_Server_Info *server)
850 __u16 mid = server->ops->get_next_mid(server);
852 * The value in the SMB header should be little endian for easy
853 * on-the-wire decoding.
855 return cpu_to_le16(mid);
859 revert_current_mid(struct TCP_Server_Info *server, const unsigned int val)
861 if (server->ops->revert_current_mid)
862 server->ops->revert_current_mid(server, val);
866 revert_current_mid_from_hdr(struct TCP_Server_Info *server,
867 const struct smb2_hdr *shdr)
869 unsigned int num = le16_to_cpu(shdr->CreditCharge);
871 return revert_current_mid(server, num > 0 ? num : 1);
875 get_mid(const struct smb_hdr *smb)
877 return le16_to_cpu(smb->Mid);
881 compare_mid(__u16 mid, const struct smb_hdr *smb)
883 return mid == le16_to_cpu(smb->Mid);
887 * When the server supports very large reads and writes via POSIX extensions,
888 * we can allow up to 2^24-1, minus the size of a READ/WRITE_AND_X header, not
889 * including the RFC1001 length.
891 * Note that this might make for "interesting" allocation problems during
892 * writeback however as we have to allocate an array of pointers for the
893 * pages. A 16M write means ~32kb page array with PAGE_SIZE == 4096.
895 * For reads, there is a similar problem as we need to allocate an array
896 * of kvecs to handle the receive, though that should only need to be done
899 #define CIFS_MAX_WSIZE ((1<<24) - 1 - sizeof(WRITE_REQ) + 4)
900 #define CIFS_MAX_RSIZE ((1<<24) - sizeof(READ_RSP) + 4)
903 * When the server doesn't allow large posix writes, only allow a rsize/wsize
904 * of 2^17-1 minus the size of the call header. That allows for a read or
905 * write up to the maximum size described by RFC1002.
907 #define CIFS_MAX_RFC1002_WSIZE ((1<<17) - 1 - sizeof(WRITE_REQ) + 4)
908 #define CIFS_MAX_RFC1002_RSIZE ((1<<17) - 1 - sizeof(READ_RSP) + 4)
910 #define CIFS_DEFAULT_IOSIZE (1024 * 1024)
913 * Windows only supports a max of 60kb reads and 65535 byte writes. Default to
914 * those values when posix extensions aren't in force. In actuality here, we
915 * use 65536 to allow for a write that is a multiple of 4k. Most servers seem
916 * to be ok with the extra byte even though Windows doesn't send writes that
921 * https://blogs.msdn.com/b/openspecification/archive/2009/04/10/smb-maximum-transmit-buffer-size-and-performance-tuning.aspx
923 #define CIFS_DEFAULT_NON_POSIX_RSIZE (60 * 1024)
924 #define CIFS_DEFAULT_NON_POSIX_WSIZE (65536)
927 * Macros to allow the TCP_Server_Info->net field and related code to drop out
928 * when CONFIG_NET_NS isn't set.
933 static inline struct net *cifs_net_ns(struct TCP_Server_Info *srv)
938 static inline void cifs_set_net_ns(struct TCP_Server_Info *srv, struct net *net)
945 static inline struct net *cifs_net_ns(struct TCP_Server_Info *srv)
950 static inline void cifs_set_net_ns(struct TCP_Server_Info *srv, struct net *net)
956 struct cifs_server_iface {
957 struct list_head iface_head;
958 struct kref refcount;
960 size_t weight_fulfilled;
961 unsigned int num_channels;
962 unsigned int rdma_capable : 1;
963 unsigned int rss_capable : 1;
964 unsigned int is_active : 1; /* unset if non existent */
965 struct sockaddr_storage sockaddr;
968 /* release iface when last ref is dropped */
970 release_iface(struct kref *ref)
972 struct cifs_server_iface *iface = container_of(ref,
973 struct cifs_server_iface,
979 unsigned int in_reconnect : 1; /* if session setup in progress for this channel */
980 struct TCP_Server_Info *server;
981 struct cifs_server_iface *iface; /* interface in use */
982 __u8 signkey[SMB3_SIGN_KEY_SIZE];
986 * Session structure. One of these for each uid session with a particular host
989 struct list_head smb_ses_list;
990 struct list_head rlist; /* reconnect list */
991 struct list_head tcon_list;
992 struct cifs_tcon *tcon_ipc;
993 spinlock_t ses_lock; /* protect anything here that is not protected */
994 struct mutex session_mutex;
995 struct TCP_Server_Info *server; /* pointer to server info */
996 int ses_count; /* reference counter */
997 enum ses_status_enum ses_status; /* updates protected by cifs_tcp_ses_lock */
998 unsigned int overrideSecFlg; /* if non-zero override global sec flags */
999 char *serverOS; /* name of operating system underlying server */
1000 char *serverNOS; /* name of network operating system of server */
1001 char *serverDomain; /* security realm of server */
1002 __u64 Suid; /* remote smb uid */
1003 kuid_t linux_uid; /* overriding owner of files on the mount */
1004 kuid_t cred_uid; /* owner of credentials */
1005 unsigned int capabilities;
1006 char ip_addr[INET6_ADDRSTRLEN + 1]; /* Max ipv6 (or v4) addr string len */
1007 char *user_name; /* must not be null except during init of sess
1008 and after mount option parsing we fill it */
1011 char workstation_name[CIFS_MAX_WORKSTATION_LEN];
1012 struct session_key auth_key;
1013 struct ntlmssp_auth *ntlmssp; /* ciphertext, flags, server challenge */
1014 enum securityEnum sectype; /* what security flavor was specified? */
1015 bool sign; /* is signing required? */
1017 __u16 session_flags;
1018 __u8 smb3signingkey[SMB3_SIGN_KEY_SIZE];
1019 __u8 smb3encryptionkey[SMB3_ENC_DEC_KEY_SIZE];
1020 __u8 smb3decryptionkey[SMB3_ENC_DEC_KEY_SIZE];
1021 __u8 preauth_sha_hash[SMB2_PREAUTH_HASH_SIZE];
1024 * Network interfaces available on the server this session is
1027 * Other channels can be opened by connecting and binding this
1028 * session to interfaces from this list.
1030 * iface_lock should be taken when accessing any of these fields
1032 spinlock_t iface_lock;
1033 /* ========= begin: protected by iface_lock ======== */
1034 struct list_head iface_list;
1036 unsigned long iface_last_update; /* jiffies */
1037 /* ========= end: protected by iface_lock ======== */
1039 spinlock_t chan_lock;
1040 /* ========= begin: protected by chan_lock ======== */
1041 #define CIFS_MAX_CHANNELS 16
1042 #define CIFS_ALL_CHANNELS_SET(ses) \
1043 ((1UL << (ses)->chan_count) - 1)
1044 #define CIFS_ALL_CHANS_GOOD(ses) \
1045 (!(ses)->chans_need_reconnect)
1046 #define CIFS_ALL_CHANS_NEED_RECONNECT(ses) \
1047 ((ses)->chans_need_reconnect == CIFS_ALL_CHANNELS_SET(ses))
1048 #define CIFS_SET_ALL_CHANS_NEED_RECONNECT(ses) \
1049 ((ses)->chans_need_reconnect = CIFS_ALL_CHANNELS_SET(ses))
1050 #define CIFS_CHAN_NEEDS_RECONNECT(ses, index) \
1051 test_bit((index), &(ses)->chans_need_reconnect)
1052 #define CIFS_CHAN_IN_RECONNECT(ses, index) \
1053 ((ses)->chans[(index)].in_reconnect)
1055 struct cifs_chan chans[CIFS_MAX_CHANNELS];
1058 atomic_t chan_seq; /* round robin state */
1061 * chans_need_reconnect is a bitmap indicating which of the channels
1062 * under this smb session needs to be reconnected.
1063 * If not multichannel session, only one bit will be used.
1065 * We will ask for sess and tcon reconnection only if all the
1066 * channels are marked for needing reconnection. This will
1067 * enable the sessions on top to continue to live till any
1068 * of the channels below are active.
1070 unsigned long chans_need_reconnect;
1071 /* ========= end: protected by chan_lock ======== */
1075 cap_unix(struct cifs_ses *ses)
1077 return ses->server->vals->cap_unix & ses->capabilities;
1081 * common struct for holding inode info when searching for or updating an
1082 * inode with new info
1085 #define CIFS_FATTR_DFS_REFERRAL 0x1
1086 #define CIFS_FATTR_DELETE_PENDING 0x2
1087 #define CIFS_FATTR_NEED_REVAL 0x4
1088 #define CIFS_FATTR_INO_COLLISION 0x8
1089 #define CIFS_FATTR_UNKNOWN_NLINK 0x10
1090 #define CIFS_FATTR_FAKE_ROOT_INO 0x20
1103 unsigned int cf_nlink;
1104 unsigned int cf_dtype;
1105 struct timespec64 cf_atime;
1106 struct timespec64 cf_mtime;
1107 struct timespec64 cf_ctime;
1109 char *cf_symlink_target;
1113 * there is one of these for each connection to a resource on a particular
1117 struct list_head tcon_list;
1119 struct list_head rlist; /* reconnect list */
1120 spinlock_t tc_lock; /* protect anything here that is not protected */
1121 atomic_t num_local_opens; /* num of all opens including disconnected */
1122 atomic_t num_remote_opens; /* num of all network opens on server */
1123 struct list_head openFileList;
1124 spinlock_t open_file_lock; /* protects list above */
1125 struct cifs_ses *ses; /* pointer to session associated with */
1126 char tree_name[MAX_TREE_SIZE + 1]; /* UNC name of resource in ASCII */
1127 char *nativeFileSystem;
1128 char *password; /* for share-level security */
1129 __u32 tid; /* The 4 byte tree id */
1130 __u16 Flags; /* optional support bits */
1131 enum tid_status_enum status;
1132 atomic_t num_smbs_sent;
1135 atomic_t num_writes;
1137 atomic_t num_flushes;
1138 atomic_t num_oplock_brks;
1140 atomic_t num_closes;
1141 atomic_t num_deletes;
1142 atomic_t num_mkdirs;
1143 atomic_t num_posixopens;
1144 atomic_t num_posixmkdirs;
1145 atomic_t num_rmdirs;
1146 atomic_t num_renames;
1147 atomic_t num_t2renames;
1148 atomic_t num_ffirst;
1150 atomic_t num_fclose;
1151 atomic_t num_hardlinks;
1152 atomic_t num_symlinks;
1154 atomic_t num_acl_get;
1155 atomic_t num_acl_set;
1158 atomic_t smb2_com_sent[NUMBER_OF_SMB2_COMMANDS];
1159 atomic_t smb2_com_failed[NUMBER_OF_SMB2_COMMANDS];
1163 __u64 bytes_written;
1164 spinlock_t stat_lock; /* protects the two fields above */
1165 FILE_SYSTEM_DEVICE_INFO fsDevInfo;
1166 FILE_SYSTEM_ATTRIBUTE_INFO fsAttrInfo; /* ok if fs name truncated */
1167 FILE_SYSTEM_UNIX_INFO fsUnixInfo;
1168 bool ipc:1; /* set if connection to IPC$ share (always also pipe) */
1169 bool pipe:1; /* set if connection to pipe share */
1170 bool print:1; /* set if connection to printer share */
1173 bool nohandlecache:1; /* if strange server resource prob can turn off */
1175 bool seal:1; /* transport encryption for this mounted share */
1176 bool unix_ext:1; /* if false disable Linux extensions to CIFS protocol
1177 for this mount even if server would support */
1178 bool posix_extensions; /* if true SMB3.11 posix extensions enabled */
1179 bool local_lease:1; /* check leases (only) on local system not remote */
1180 bool broken_posix_open; /* e.g. Samba server versions < 3.3.2, 3.2.9 */
1181 bool broken_sparse_sup; /* if server or share does not support sparse */
1182 bool need_reconnect:1; /* connection reset, tid now invalid */
1183 bool need_reopen_files:1; /* need to reopen tcon file handles */
1184 bool use_resilient:1; /* use resilient instead of durable handles */
1185 bool use_persistent:1; /* use persistent instead of durable handles */
1186 bool no_lease:1; /* Do not request leases on files or directories */
1187 bool use_witness:1; /* use witness protocol */
1188 __le32 capabilities;
1190 __u32 maximal_access;
1191 __u32 vol_serial_number;
1192 __le64 vol_create_time;
1193 __u64 snapshot_time; /* for timewarp tokens - timestamp of snapshot */
1194 __u32 handle_timeout; /* persistent and durable handle timeout in ms */
1195 __u32 ss_flags; /* sector size flags */
1196 __u32 perf_sector_size; /* best sector size for perf */
1198 __u32 max_bytes_chunk;
1199 __u32 max_bytes_copy;
1200 #ifdef CONFIG_CIFS_FSCACHE
1201 u64 resource_id; /* server resource id */
1202 struct fscache_volume *fscache; /* cookie for share */
1204 struct list_head pending_opens; /* list of incomplete opens */
1205 struct cached_fids *cfids;
1206 /* BB add field for back pointer to sb struct(s)? */
1207 #ifdef CONFIG_CIFS_DFS_UPCALL
1208 struct list_head ulist; /* cache update list */
1210 struct delayed_work query_interfaces; /* query interfaces workqueue job */
1214 * This is a refcounted and timestamped container for a tcon pointer. The
1215 * container holds a tcon reference. It is considered safe to free one of
1216 * these when the tl_count goes to 0. The tl_time is the time of the last
1217 * "get" on the container.
1220 struct rb_node tl_rbnode;
1222 unsigned long tl_flags;
1223 #define TCON_LINK_MASTER 0
1224 #define TCON_LINK_PENDING 1
1225 #define TCON_LINK_IN_TREE 2
1226 unsigned long tl_time;
1228 struct cifs_tcon *tl_tcon;
1231 extern struct tcon_link *cifs_sb_tlink(struct cifs_sb_info *cifs_sb);
1232 extern void smb3_free_compound_rqst(int num_rqst, struct smb_rqst *rqst);
1234 static inline struct cifs_tcon *
1235 tlink_tcon(struct tcon_link *tlink)
1237 return tlink->tl_tcon;
1240 static inline struct tcon_link *
1241 cifs_sb_master_tlink(struct cifs_sb_info *cifs_sb)
1243 return cifs_sb->master_tlink;
1246 extern void cifs_put_tlink(struct tcon_link *tlink);
1248 static inline struct tcon_link *
1249 cifs_get_tlink(struct tcon_link *tlink)
1251 if (tlink && !IS_ERR(tlink))
1252 atomic_inc(&tlink->tl_count);
1256 /* This function is always expected to succeed */
1257 extern struct cifs_tcon *cifs_sb_master_tcon(struct cifs_sb_info *cifs_sb);
1259 #define CIFS_OPLOCK_NO_CHANGE 0xfe
1261 struct cifs_pending_open {
1262 struct list_head olist;
1263 struct tcon_link *tlink;
1268 struct cifs_deferred_close {
1269 struct list_head dlist;
1270 struct tcon_link *tlink;
1272 __u64 persistent_fid;
1277 * This info hangs off the cifsFileInfo structure, pointed to by llist.
1278 * This is used to track byte stream locks on the file
1280 struct cifsLockInfo {
1281 struct list_head llist; /* pointer to next cifsLockInfo */
1282 struct list_head blist; /* pointer to locks blocked on this */
1283 wait_queue_head_t block_q;
1292 * One of these for each open instance of a file
1294 struct cifs_search_info {
1295 loff_t index_of_last_entry;
1296 __u16 entries_in_buffer;
1299 char *ntwrk_buf_start;
1300 char *srch_entries_start;
1302 const char *presume_name;
1303 unsigned int resume_name_len;
1307 bool smallBuf:1; /* so we know which buf_release function to call */
1310 #define ACL_NO_MODE ((umode_t)(-1))
1311 struct cifs_open_parms {
1312 struct cifs_tcon *tcon;
1313 struct cifs_sb_info *cifs_sb;
1318 struct cifs_fid *fid;
1325 __u64 persistent_fid; /* persist file id for smb2 */
1326 __u64 volatile_fid; /* volatile file id for smb2 */
1327 __u8 lease_key[SMB2_LEASE_KEY_SIZE]; /* lease key for smb2 */
1328 __u8 create_guid[16];
1330 struct cifs_pending_open *pending_open;
1332 #ifdef CONFIG_CIFS_DEBUG2
1334 #endif /* CIFS_DEBUG2 */
1338 struct cifs_fid_locks {
1339 struct list_head llist;
1340 struct cifsFileInfo *cfile; /* fid that owns locks */
1341 struct list_head locks; /* locks held by fid above */
1344 struct cifsFileInfo {
1345 /* following two lists are protected by tcon->open_file_lock */
1346 struct list_head tlist; /* pointer to next fid owned by tcon */
1347 struct list_head flist; /* next fid (file instance) for this inode */
1348 /* lock list below protected by cifsi->lock_sem */
1349 struct cifs_fid_locks *llist; /* brlocks held by this fid */
1350 kuid_t uid; /* allows finding which FileInfo structure */
1351 __u32 pid; /* process id who opened file */
1352 struct cifs_fid fid; /* file id from remote */
1353 struct list_head rlist; /* reconnect list */
1354 /* BB add lock scope info here if needed */
1355 /* lock scope id (0 if none) */
1356 struct dentry *dentry;
1357 struct tcon_link *tlink;
1358 unsigned int f_flags;
1359 bool invalidHandle:1; /* file closed via session abend */
1361 bool oplock_break_cancelled:1;
1362 bool offload:1; /* offload final part of _put to a wq */
1363 unsigned int oplock_epoch; /* epoch from the lease break */
1364 __u32 oplock_level; /* oplock/lease level from the lease break */
1366 spinlock_t file_info_lock; /* protects four flag/count fields above */
1367 struct mutex fh_mutex; /* prevents reopen race after dead ses*/
1368 struct cifs_search_info srch_inf;
1369 struct work_struct oplock_break; /* work for oplock breaks */
1370 struct work_struct put; /* work for the final part of _put */
1371 struct work_struct serverclose; /* work for serverclose */
1372 struct delayed_work deferred;
1373 bool deferred_close_scheduled; /* Flag to indicate close is scheduled */
1374 char *symlink_target;
1377 struct cifs_io_parms {
1379 __u64 persistent_fid; /* persist file id for smb2 */
1380 __u64 volatile_fid; /* volatile file id for smb2 */
1383 unsigned int length;
1384 struct cifs_tcon *tcon;
1385 struct TCP_Server_Info *server;
1388 struct cifs_aio_ctx {
1389 struct kref refcount;
1390 struct list_head list;
1391 struct mutex aio_mutex;
1392 struct completion done;
1393 struct iov_iter iter;
1395 struct cifsFileInfo *cfile;
1398 unsigned int npages;
1401 unsigned int total_len;
1404 * Indicates if this aio_ctx is for direct_io,
1405 * If yes, iter is a copy of the user passed iov_iter
1410 /* asynchronous read support */
1411 struct cifs_readdata {
1412 struct kref refcount;
1413 struct list_head list;
1414 struct completion done;
1415 struct cifsFileInfo *cfile;
1416 struct address_space *mapping;
1417 struct cifs_aio_ctx *ctx;
1420 unsigned int got_bytes;
1423 struct work_struct work;
1424 int (*read_into_pages)(struct TCP_Server_Info *server,
1425 struct cifs_readdata *rdata,
1427 int (*copy_into_pages)(struct TCP_Server_Info *server,
1428 struct cifs_readdata *rdata,
1429 struct iov_iter *iter);
1431 struct TCP_Server_Info *server;
1432 #ifdef CONFIG_CIFS_SMB_DIRECT
1435 unsigned int pagesz;
1436 unsigned int page_offset;
1437 unsigned int tailsz;
1438 struct cifs_credits credits;
1439 unsigned int nr_pages;
1440 struct page **pages;
1443 /* asynchronous write support */
1444 struct cifs_writedata {
1445 struct kref refcount;
1446 struct list_head list;
1447 struct completion done;
1448 enum writeback_sync_modes sync_mode;
1449 struct work_struct work;
1450 struct cifsFileInfo *cfile;
1451 struct cifs_aio_ctx *ctx;
1456 struct TCP_Server_Info *server;
1457 #ifdef CONFIG_CIFS_SMB_DIRECT
1460 unsigned int pagesz;
1461 unsigned int page_offset;
1462 unsigned int tailsz;
1463 struct cifs_credits credits;
1464 unsigned int nr_pages;
1465 struct page **pages;
1469 * Take a reference on the file private data. Must be called with
1470 * cfile->file_info_lock held.
1473 cifsFileInfo_get_locked(struct cifsFileInfo *cifs_file)
1478 struct cifsFileInfo *cifsFileInfo_get(struct cifsFileInfo *cifs_file);
1479 void _cifsFileInfo_put(struct cifsFileInfo *cifs_file, bool wait_oplock_hdlr,
1481 void cifsFileInfo_put(struct cifsFileInfo *cifs_file);
1483 #define CIFS_CACHE_READ_FLG 1
1484 #define CIFS_CACHE_HANDLE_FLG 2
1485 #define CIFS_CACHE_RH_FLG (CIFS_CACHE_READ_FLG | CIFS_CACHE_HANDLE_FLG)
1486 #define CIFS_CACHE_WRITE_FLG 4
1487 #define CIFS_CACHE_RW_FLG (CIFS_CACHE_READ_FLG | CIFS_CACHE_WRITE_FLG)
1488 #define CIFS_CACHE_RHW_FLG (CIFS_CACHE_RW_FLG | CIFS_CACHE_HANDLE_FLG)
1490 #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))
1491 #define CIFS_CACHE_HANDLE(cinode) (cinode->oplock & CIFS_CACHE_HANDLE_FLG)
1492 #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))
1495 * One of these for each file inode
1498 struct cifsInodeInfo {
1499 struct netfs_inode netfs; /* Netfslib context and vfs inode */
1500 bool can_cache_brlcks;
1501 struct list_head llist; /* locks helb by this inode */
1503 * NOTE: Some code paths call down_read(lock_sem) twice, so
1504 * we must always use cifs_down_write() instead of down_write()
1505 * for this semaphore to avoid deadlocks.
1507 struct rw_semaphore lock_sem; /* protect the fields above */
1508 /* BB add in lists for dirty pages i.e. write caching info for oplock */
1509 struct list_head openFileList;
1510 spinlock_t open_file_lock; /* protects openFileList */
1511 __u32 cifsAttrs; /* e.g. DOS archive bit, sparse, compressed, system */
1512 unsigned int oplock; /* oplock/lease level we have */
1513 unsigned int epoch; /* used to track lease state changes */
1514 #define CIFS_INODE_PENDING_OPLOCK_BREAK (0) /* oplock break in progress */
1515 #define CIFS_INODE_PENDING_WRITERS (1) /* Writes in progress */
1516 #define CIFS_INODE_FLAG_UNUSED (2) /* Unused flag */
1517 #define CIFS_INO_DELETE_PENDING (3) /* delete pending on server */
1518 #define CIFS_INO_INVALID_MAPPING (4) /* pagecache is invalid */
1519 #define CIFS_INO_LOCK (5) /* lock bit for synchronization */
1520 #define CIFS_INO_MODIFIED_ATTR (6) /* Indicate change in mtime/ctime */
1521 #define CIFS_INO_CLOSE_ON_LOCK (7) /* Not to defer the close when lock is set */
1522 unsigned long flags;
1523 spinlock_t writers_lock;
1524 unsigned int writers; /* Number of writers on this inode */
1525 unsigned long time; /* jiffies of last update of inode */
1526 u64 server_eof; /* current file size on server -- protected by i_lock */
1527 u64 uniqueid; /* server inode number */
1528 u64 createtime; /* creation time on server */
1529 __u8 lease_key[SMB2_LEASE_KEY_SIZE]; /* lease key for this inode */
1530 struct list_head deferred_closes; /* list of deferred closes */
1531 spinlock_t deferred_lock; /* protection on deferred list */
1532 bool lease_granted; /* Flag to indicate whether lease or oplock is granted. */
1533 char *symlink_target;
1536 static inline struct cifsInodeInfo *
1537 CIFS_I(struct inode *inode)
1539 return container_of(inode, struct cifsInodeInfo, netfs.inode);
1542 static inline struct cifs_sb_info *
1543 CIFS_SB(struct super_block *sb)
1545 return sb->s_fs_info;
1548 static inline struct cifs_sb_info *
1549 CIFS_FILE_SB(struct file *file)
1551 return CIFS_SB(file_inode(file)->i_sb);
1554 static inline char CIFS_DIR_SEP(const struct cifs_sb_info *cifs_sb)
1556 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_POSIX_PATHS)
1563 convert_delimiter(char *path, char delim)
1565 char old_delim, *pos;
1573 while ((pos = strchr(pos, old_delim)))
1577 #define cifs_stats_inc atomic_inc
1579 static inline void cifs_stats_bytes_written(struct cifs_tcon *tcon,
1583 spin_lock(&tcon->stat_lock);
1584 tcon->bytes_written += bytes;
1585 spin_unlock(&tcon->stat_lock);
1589 static inline void cifs_stats_bytes_read(struct cifs_tcon *tcon,
1592 spin_lock(&tcon->stat_lock);
1593 tcon->bytes_read += bytes;
1594 spin_unlock(&tcon->stat_lock);
1599 * This is the prototype for the mid receive function. This function is for
1600 * receiving the rest of the SMB frame, starting with the WordCount (which is
1601 * just after the MID in struct smb_hdr). Note:
1603 * - This will be called by cifsd, with no locks held.
1604 * - The mid will still be on the pending_mid_q.
1605 * - mid->resp_buf will point to the current buffer.
1607 * Returns zero on a successful receive, or an error. The receive state in
1608 * the TCP_Server_Info will also be updated.
1610 typedef int (mid_receive_t)(struct TCP_Server_Info *server,
1611 struct mid_q_entry *mid);
1614 * This is the prototype for the mid callback function. This is called once the
1615 * mid has been received off of the socket. When creating one, take special
1616 * care to avoid deadlocks. Things to bear in mind:
1618 * - it will be called by cifsd, with no locks held
1619 * - the mid will be removed from any lists
1621 typedef void (mid_callback_t)(struct mid_q_entry *mid);
1624 * This is the protopyte for mid handle function. This is called once the mid
1625 * has been recognized after decryption of the message.
1627 typedef int (mid_handle_t)(struct TCP_Server_Info *server,
1628 struct mid_q_entry *mid);
1630 /* one of these for every pending CIFS request to the server */
1631 struct mid_q_entry {
1632 struct list_head qhead; /* mids waiting on reply from this server */
1633 struct kref refcount;
1634 struct TCP_Server_Info *server; /* server corresponding to this mid */
1635 __u64 mid; /* multiplex id */
1636 __u16 credits; /* number of credits consumed by this mid */
1637 __u16 credits_received; /* number of credits from the response */
1638 __u32 pid; /* process id */
1639 __u32 sequence_number; /* for CIFS signing */
1640 unsigned long when_alloc; /* when mid was created */
1641 #ifdef CONFIG_CIFS_STATS2
1642 unsigned long when_sent; /* time when smb send finished */
1643 unsigned long when_received; /* when demux complete (taken off wire) */
1645 mid_receive_t *receive; /* call receive callback */
1646 mid_callback_t *callback; /* call completion callback */
1647 mid_handle_t *handle; /* call handle mid callback */
1648 void *callback_data; /* general purpose pointer for callback */
1649 struct task_struct *creator;
1650 void *resp_buf; /* pointer to received SMB header */
1651 unsigned int resp_buf_size;
1652 int mid_state; /* wish this were enum but can not pass to wait_event */
1653 unsigned int mid_flags;
1654 __le16 command; /* smb command code */
1655 unsigned int optype; /* operation type */
1656 bool large_buf:1; /* if valid response, is pointer to large buf */
1657 bool multiRsp:1; /* multiple trans2 responses for one request */
1658 bool multiEnd:1; /* both received */
1659 bool decrypted:1; /* decrypted entry */
1662 struct close_cancelled_open {
1663 struct cifs_fid fid;
1664 struct cifs_tcon *tcon;
1665 struct work_struct work;
1670 /* Make code in transport.c a little cleaner by moving
1671 update of optional stats into function below */
1672 static inline void cifs_in_send_inc(struct TCP_Server_Info *server)
1674 atomic_inc(&server->in_send);
1677 static inline void cifs_in_send_dec(struct TCP_Server_Info *server)
1679 atomic_dec(&server->in_send);
1682 static inline void cifs_num_waiters_inc(struct TCP_Server_Info *server)
1684 atomic_inc(&server->num_waiters);
1687 static inline void cifs_num_waiters_dec(struct TCP_Server_Info *server)
1689 atomic_dec(&server->num_waiters);
1692 #ifdef CONFIG_CIFS_STATS2
1693 static inline void cifs_save_when_sent(struct mid_q_entry *mid)
1695 mid->when_sent = jiffies;
1698 static inline void cifs_save_when_sent(struct mid_q_entry *mid)
1703 /* for pending dnotify requests */
1704 struct dir_notify_req {
1705 struct list_head lhead;
1712 __u32 filter; /* CompletionFilter (for multishot) */
1717 struct dfs_info3_param {
1718 int flags; /* DFSREF_REFERRAL_SERVER, DFSREF_STORAGE_SERVER*/
1728 struct list_head list;
1729 struct cifsFileInfo *cfile;
1732 static inline void free_dfs_info_param(struct dfs_info3_param *param)
1735 kfree(param->path_name);
1736 kfree(param->node_name);
1740 static inline void free_dfs_info_array(struct dfs_info3_param *param,
1741 int number_of_items)
1745 if ((number_of_items == 0) || (param == NULL))
1747 for (i = 0; i < number_of_items; i++) {
1748 kfree(param[i].path_name);
1749 kfree(param[i].node_name);
1754 static inline bool is_interrupt_error(int error)
1759 case -ERESTARTNOHAND:
1760 case -ERESTARTNOINTR:
1766 static inline bool is_retryable_error(int error)
1768 if (is_interrupt_error(error) || error == -EAGAIN)
1774 /* cifs_get_writable_file() flags */
1775 #define FIND_WR_ANY 0
1776 #define FIND_WR_FSUID_ONLY 1
1777 #define FIND_WR_WITH_DELETE 2
1780 #define MID_REQUEST_ALLOCATED 1
1781 #define MID_REQUEST_SUBMITTED 2
1782 #define MID_RESPONSE_RECEIVED 4
1783 #define MID_RETRY_NEEDED 8 /* session closed while this request out */
1784 #define MID_RESPONSE_MALFORMED 0x10
1785 #define MID_SHUTDOWN 0x20
1786 #define MID_RESPONSE_READY 0x40 /* ready for other process handle the rsp */
1789 #define MID_WAIT_CANCELLED 1 /* Cancelled while waiting for response */
1790 #define MID_DELETED 2 /* Mid has been dequeued/deleted */
1792 /* Types of response buffer returned from SendReceive2 */
1793 #define CIFS_NO_BUFFER 0 /* Response buffer not returned */
1794 #define CIFS_SMALL_BUFFER 1
1795 #define CIFS_LARGE_BUFFER 2
1796 #define CIFS_IOVEC 4 /* array of response buffers */
1798 /* Type of Request to SendReceive2 */
1799 #define CIFS_BLOCKING_OP 1 /* operation can block */
1800 #define CIFS_NON_BLOCKING 2 /* do not block waiting for credits */
1801 #define CIFS_TIMEOUT_MASK 0x003 /* only one of above set in req */
1802 #define CIFS_LOG_ERROR 0x010 /* log NT STATUS if non-zero */
1803 #define CIFS_LARGE_BUF_OP 0x020 /* large request buffer */
1804 #define CIFS_NO_RSP_BUF 0x040 /* no response buffer required */
1806 /* Type of request operation */
1807 #define CIFS_ECHO_OP 0x080 /* echo request */
1808 #define CIFS_OBREAK_OP 0x0100 /* oplock break request */
1809 #define CIFS_NEG_OP 0x0200 /* negotiate request */
1810 #define CIFS_CP_CREATE_CLOSE_OP 0x0400 /* compound create+close request */
1811 /* Lower bitmask values are reserved by others below. */
1812 #define CIFS_SESS_OP 0x2000 /* session setup request */
1813 #define CIFS_OP_MASK 0x2780 /* mask request type */
1815 #define CIFS_HAS_CREDITS 0x0400 /* already has credits */
1816 #define CIFS_TRANSFORM_REQ 0x0800 /* transform request before sending */
1817 #define CIFS_NO_SRV_RSP 0x1000 /* there is no server response */
1819 /* Security Flags: indicate type of session setup needed */
1820 #define CIFSSEC_MAY_SIGN 0x00001
1821 #define CIFSSEC_MAY_NTLMV2 0x00004
1822 #define CIFSSEC_MAY_KRB5 0x00008
1823 #define CIFSSEC_MAY_SEAL 0x00040 /* not supported yet */
1824 #define CIFSSEC_MAY_NTLMSSP 0x00080 /* raw ntlmssp with ntlmv2 */
1826 #define CIFSSEC_MUST_SIGN 0x01001
1827 /* note that only one of the following can be set so the
1828 result of setting MUST flags more than once will be to
1829 require use of the stronger protocol */
1830 #define CIFSSEC_MUST_NTLMV2 0x04004
1831 #define CIFSSEC_MUST_KRB5 0x08008
1832 #ifdef CONFIG_CIFS_UPCALL
1833 #define CIFSSEC_MASK 0x8F08F /* flags supported if no weak allowed */
1835 #define CIFSSEC_MASK 0x87087 /* flags supported if no weak allowed */
1837 #define CIFSSEC_MUST_SEAL 0x40040 /* not supported yet */
1838 #define CIFSSEC_MUST_NTLMSSP 0x80080 /* raw ntlmssp with ntlmv2 */
1840 #define CIFSSEC_DEF (CIFSSEC_MAY_SIGN | CIFSSEC_MAY_NTLMV2 | CIFSSEC_MAY_NTLMSSP)
1841 #define CIFSSEC_MAX (CIFSSEC_MUST_NTLMV2)
1842 #define CIFSSEC_AUTH_MASK (CIFSSEC_MAY_NTLMV2 | CIFSSEC_MAY_KRB5 | CIFSSEC_MAY_NTLMSSP)
1844 *****************************************************************
1845 * All constants go here
1846 *****************************************************************
1849 #define UID_HASH (16)
1852 * Note that ONE module should define _DECLARE_GLOBALS_HERE to cause the
1853 * following to be declared.
1856 /****************************************************************************
1857 * Here are all the locks (spinlock, mutex, semaphore) in cifs.ko, arranged according
1858 * to the locking order. i.e. if two locks are to be held together, the lock that
1859 * appears higher in this list needs to be taken before the other.
1861 * If you hold a lock that is lower in this list, and you need to take a higher lock
1862 * (or if you think that one of the functions that you're calling may need to), first
1863 * drop the lock you hold, pick up the higher lock, then the lower one. This will
1864 * ensure that locks are picked up only in one direction in the below table
1867 * Also, if you expect a function to be called with a lock held, explicitly document
1868 * this in the comments on top of your function definition.
1870 * And also, try to keep the critical sections (lock hold time) to be as minimal as
1871 * possible. Blocking / calling other functions with a lock held always increase
1872 * the risk of a possible deadlock.
1874 * Following this rule will avoid unnecessary deadlocks, which can get really hard to
1875 * debug. Also, any new lock that you introduce, please add to this list in the correct
1878 * Please populate this list whenever you introduce new locks in your changes. Or in
1879 * case I've missed some existing locks. Please ensure that it's added in the list
1880 * based on the locking order expected.
1882 * =====================================================================================
1883 * Lock Protects Initialization fn
1884 * =====================================================================================
1886 * vol_info->ctx_lock vol_info->ctx
1887 * cifs_sb_info->tlink_tree_lock cifs_sb_info->tlink_tree cifs_setup_cifs_sb
1888 * TCP_Server_Info-> TCP_Server_Info cifs_get_tcp_session
1890 * TCP_Server_Info->srv_mutex TCP_Server_Info cifs_get_tcp_session
1891 * cifs_ses->session_mutex cifs_ses sesInfoAlloc
1893 * cifs_tcon->open_file_lock cifs_tcon->openFileList tconInfoAlloc
1894 * cifs_tcon->pending_opens
1895 * cifs_tcon->stat_lock cifs_tcon->bytes_read tconInfoAlloc
1896 * cifs_tcon->bytes_written
1897 * cifs_tcp_ses_lock cifs_tcp_ses_list sesInfoAlloc
1898 * GlobalMid_Lock GlobalMaxActiveXid init_cifs
1900 * GlobalTotalActiveXid
1901 * TCP_Server_Info->srv_lock (anything in struct not protected by another lock and can change)
1902 * TCP_Server_Info->mid_lock TCP_Server_Info->pending_mid_q cifs_get_tcp_session
1904 * (any changes in mid_q_entry fields)
1905 * TCP_Server_Info->req_lock TCP_Server_Info->in_flight cifs_get_tcp_session
1909 * ->reconnect_instance
1910 * cifs_ses->ses_lock (anything that is not protected by another lock and can change)
1911 * cifs_ses->iface_lock cifs_ses->iface_list sesInfoAlloc
1913 * ->iface_last_update
1914 * cifs_ses->chan_lock cifs_ses->chans
1915 * ->chans_need_reconnect
1916 * ->chans_in_reconnect
1917 * cifs_tcon->tc_lock (anything that is not protected by another lock and can change)
1918 * cifsInodeInfo->open_file_lock cifsInodeInfo->openFileList cifs_alloc_inode
1919 * cifsInodeInfo->writers_lock cifsInodeInfo->writers cifsInodeInfo_alloc
1920 * cifsInodeInfo->lock_sem cifsInodeInfo->llist cifs_init_once
1921 * ->can_cache_brlcks
1922 * cifsInodeInfo->deferred_lock cifsInodeInfo->deferred_closes cifsInodeInfo_alloc
1923 * cached_fid->fid_mutex cifs_tcon->crfid tconInfoAlloc
1924 * cifsFileInfo->fh_mutex cifsFileInfo cifs_new_fileinfo
1925 * cifsFileInfo->file_info_lock cifsFileInfo->count cifs_new_fileinfo
1926 * ->invalidHandle initiate_cifs_search
1927 * ->oplock_break_cancelled
1928 * cifs_aio_ctx->aio_mutex cifs_aio_ctx cifs_aio_ctx_alloc
1929 ****************************************************************************/
1931 #ifdef DECLARE_GLOBALS_HERE
1932 #define GLOBAL_EXTERN
1934 #define GLOBAL_EXTERN extern
1938 * the list of TCP_Server_Info structures, ie each of the sockets
1939 * connecting our client to a distinct server (ip address), is
1940 * chained together by cifs_tcp_ses_list. The list of all our SMB
1941 * sessions (and from that the tree connections) can be found
1942 * by iterating over cifs_tcp_ses_list
1944 extern struct list_head cifs_tcp_ses_list;
1947 * This lock protects the cifs_tcp_ses_list, the list of smb sessions per
1948 * tcp session, and the list of tcon's per smb session. It also protects
1949 * the reference counters for the server, smb session, and tcon.
1950 * generally the locks should be taken in order tcp_ses_lock before
1951 * tcon->open_file_lock and that before file->file_info_lock since the
1952 * structure order is cifs_socket-->cifs_ses-->cifs_tcon-->cifs_file
1954 extern spinlock_t cifs_tcp_ses_lock;
1957 * Global transaction id (XID) information
1959 extern unsigned int GlobalCurrentXid; /* protected by GlobalMid_Sem */
1960 extern unsigned int GlobalTotalActiveXid; /* prot by GlobalMid_Sem */
1961 extern unsigned int GlobalMaxActiveXid; /* prot by GlobalMid_Sem */
1962 extern spinlock_t GlobalMid_Lock; /* protects above & list operations on midQ entries */
1965 * Global counters, updated atomically
1967 extern atomic_t sesInfoAllocCount;
1968 extern atomic_t tconInfoAllocCount;
1969 extern atomic_t tcpSesNextId;
1970 extern atomic_t tcpSesAllocCount;
1971 extern atomic_t tcpSesReconnectCount;
1972 extern atomic_t tconInfoReconnectCount;
1974 /* Various Debug counters */
1975 extern atomic_t buf_alloc_count; /* current number allocated */
1976 extern atomic_t small_buf_alloc_count;
1977 #ifdef CONFIG_CIFS_STATS2
1978 extern atomic_t total_buf_alloc_count; /* total allocated over all time */
1979 extern atomic_t total_small_buf_alloc_count;
1980 extern unsigned int slow_rsp_threshold; /* number of secs before logging */
1984 extern bool enable_oplocks; /* enable or disable oplocks */
1985 extern bool lookupCacheEnabled;
1986 extern unsigned int global_secflags; /* if on, session setup sent
1987 with more secure ntlmssp2 challenge/resp */
1988 extern unsigned int sign_CIFS_PDUs; /* enable smb packet signing */
1989 extern bool enable_gcm_256; /* allow optional negotiate of strongest signing (aes-gcm-256) */
1990 extern bool require_gcm_256; /* require use of strongest signing (aes-gcm-256) */
1991 extern bool enable_negotiate_signing; /* request use of faster (GMAC) signing if available */
1992 extern bool linuxExtEnabled;/*enable Linux/Unix CIFS extensions*/
1993 extern unsigned int CIFSMaxBufSize; /* max size not including hdr */
1994 extern unsigned int cifs_min_rcv; /* min size of big ntwrk buf pool */
1995 extern unsigned int cifs_min_small; /* min size of small buf pool */
1996 extern unsigned int cifs_max_pending; /* MAX requests at once to server*/
1997 extern bool disable_legacy_dialects; /* forbid vers=1.0 and vers=2.0 mounts */
1998 extern atomic_t mid_count;
2000 void cifs_oplock_break(struct work_struct *work);
2001 void cifs_queue_oplock_break(struct cifsFileInfo *cfile);
2002 void smb2_deferred_work_close(struct work_struct *work);
2004 extern const struct slow_work_ops cifs_oplock_break_ops;
2005 extern struct workqueue_struct *cifsiod_wq;
2006 extern struct workqueue_struct *decrypt_wq;
2007 extern struct workqueue_struct *fileinfo_put_wq;
2008 extern struct workqueue_struct *cifsoplockd_wq;
2009 extern struct workqueue_struct *deferredclose_wq;
2010 extern struct workqueue_struct *serverclose_wq;
2011 extern __u32 cifs_lock_secret;
2013 extern mempool_t *cifs_mid_poolp;
2015 /* Operations for different SMB versions */
2016 #define SMB1_VERSION_STRING "1.0"
2017 #define SMB20_VERSION_STRING "2.0"
2018 #ifdef CONFIG_CIFS_ALLOW_INSECURE_LEGACY
2019 extern struct smb_version_operations smb1_operations;
2020 extern struct smb_version_values smb1_values;
2021 extern struct smb_version_operations smb20_operations;
2022 extern struct smb_version_values smb20_values;
2023 #endif /* CIFS_ALLOW_INSECURE_LEGACY */
2024 #define SMB21_VERSION_STRING "2.1"
2025 extern struct smb_version_operations smb21_operations;
2026 extern struct smb_version_values smb21_values;
2027 #define SMBDEFAULT_VERSION_STRING "default"
2028 extern struct smb_version_values smbdefault_values;
2029 #define SMB3ANY_VERSION_STRING "3"
2030 extern struct smb_version_values smb3any_values;
2031 #define SMB30_VERSION_STRING "3.0"
2032 extern struct smb_version_operations smb30_operations;
2033 extern struct smb_version_values smb30_values;
2034 #define SMB302_VERSION_STRING "3.02"
2035 #define ALT_SMB302_VERSION_STRING "3.0.2"
2036 /*extern struct smb_version_operations smb302_operations;*/ /* not needed yet */
2037 extern struct smb_version_values smb302_values;
2038 #define SMB311_VERSION_STRING "3.1.1"
2039 #define ALT_SMB311_VERSION_STRING "3.11"
2040 extern struct smb_version_operations smb311_operations;
2041 extern struct smb_version_values smb311_values;
2043 static inline char *get_security_type_str(enum securityEnum sectype)
2047 return "RawNTLMSSP";
2057 static inline bool is_smb1_server(struct TCP_Server_Info *server)
2059 return strcmp(server->vals->version_string, SMB1_VERSION_STRING) == 0;
2062 static inline bool is_tcon_dfs(struct cifs_tcon *tcon)
2065 * For SMB1, see MS-CIFS 2.4.55 SMB_COM_TREE_CONNECT_ANDX (0x75) and MS-CIFS 3.3.4.4 DFS
2066 * Subsystem Notifies That a Share Is a DFS Share.
2068 * For SMB2+, see MS-SMB2 2.2.10 SMB2 TREE_CONNECT Response and MS-SMB2 3.3.4.14 Server
2069 * Application Updates a Share.
2071 if (!tcon || !tcon->ses || !tcon->ses->server)
2073 return is_smb1_server(tcon->ses->server) ? tcon->Flags & SMB_SHARE_IS_IN_DFS :
2074 tcon->share_flags & (SHI1005_FLAGS_DFS | SHI1005_FLAGS_DFS_ROOT);
2077 static inline bool cifs_is_referral_server(struct cifs_tcon *tcon,
2078 const struct dfs_info3_param *ref)
2081 * Check if all targets are capable of handling DFS referrals as per
2082 * MS-DFSC 2.2.4 RESP_GET_DFS_REFERRAL.
2084 return is_tcon_dfs(tcon) || (ref && (ref->flags & DFSREF_REFERRAL_SERVER));
2087 static inline u64 cifs_flock_len(const struct file_lock *fl)
2089 return (u64)fl->fl_end - fl->fl_start + 1;
2092 static inline size_t ntlmssp_workstation_name_size(const struct cifs_ses *ses)
2094 if (WARN_ON_ONCE(!ses || !ses->server))
2097 * Make workstation name no more than 15 chars when using insecure dialects as some legacy
2098 * servers do require it during NTLMSSP.
2100 if (ses->server->dialect <= SMB20_PROT_ID)
2101 return min_t(size_t, sizeof(ses->workstation_name), RFC1001_NAME_LEN_WITH_NULL);
2102 return sizeof(ses->workstation_name);
2105 static inline void move_cifs_info_to_smb2(struct smb2_file_all_info *dst, const FILE_ALL_INFO *src)
2107 memcpy(dst, src, (size_t)((u8 *)&src->AccessFlags - (u8 *)src));
2108 dst->AccessFlags = src->AccessFlags;
2109 dst->CurrentByteOffset = src->CurrentByteOffset;
2110 dst->Mode = src->Mode;
2111 dst->AlignmentRequirement = src->AlignmentRequirement;
2112 dst->FileNameLength = src->FileNameLength;
2115 static inline unsigned int cifs_get_num_sgs(const struct smb_rqst *rqst,
2119 unsigned int len, skip;
2120 unsigned int nents = 0;
2124 /* Assumes the first rqst has a transform header as the first iov.
2126 * rqst[0].rq_iov[0] is transform header
2127 * rqst[0].rq_iov[1+] data to be encrypted/decrypted
2128 * rqst[1+].rq_iov[0+] data to be encrypted/decrypted
2130 for (i = 0; i < num_rqst; i++) {
2132 * The first rqst has a transform header where the
2133 * first 20 bytes are not part of the encrypted blob.
2135 for (j = 0; j < rqst[i].rq_nvec; j++) {
2136 struct kvec *iov = &rqst[i].rq_iov[j];
2138 skip = (i == 0) && (j == 0) ? 20 : 0;
2139 addr = (unsigned long)iov->iov_base + skip;
2140 if (unlikely(is_vmalloc_addr((void *)addr))) {
2141 len = iov->iov_len - skip;
2142 nents += DIV_ROUND_UP(offset_in_page(addr) + len,
2148 nents += rqst[i].rq_npages;
2150 nents += DIV_ROUND_UP(offset_in_page(sig) + SMB2_SIGNATURE_SIZE, PAGE_SIZE);
2154 /* We can not use the normal sg_set_buf() as we will sometimes pass a
2155 * stack object as buf.
2157 static inline struct scatterlist *cifs_sg_set_buf(struct scatterlist *sg,
2159 unsigned int buflen)
2161 unsigned long addr = (unsigned long)buf;
2162 unsigned int off = offset_in_page(addr);
2165 if (unlikely(is_vmalloc_addr((void *)addr))) {
2167 unsigned int len = min_t(unsigned int, buflen, PAGE_SIZE - off);
2169 sg_set_page(sg++, vmalloc_to_page((void *)addr), len, off);
2176 sg_set_page(sg++, virt_to_page(addr), buflen, off);
2181 static inline bool cifs_ses_exiting(struct cifs_ses *ses)
2185 spin_lock(&ses->ses_lock);
2186 ret = ses->ses_status == SES_EXITING;
2187 spin_unlock(&ses->ses_lock);
2191 #endif /* _CIFS_GLOB_H */