fs/cifs/cifsglob.h

   1 /*
   2  *   fs/cifs/cifsglob.h
   3  *
   4  *   Copyright (C) International Business Machines  Corp., 2002,2008
   5  *   Author(s): Steve French (sfrench@us.ibm.com)
   6  *              Jeremy Allison (jra@samba.org)
   7  *
   8  *   This library is free software; you can redistribute it and/or modify
   9  *   it under the terms of the GNU Lesser General Public License as published
  10  *   by the Free Software Foundation; either version 2.1 of the License, or
  11  *   (at your option) any later version.
  12  *
  13  *   This library is distributed in the hope that it will be useful,
  14  *   but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See
  16  *   the GNU Lesser General Public License for more details.
  17  *
  18  */
  19 #ifndef _CIFS_GLOB_H
  20 #define _CIFS_GLOB_H
  21
  22 #include <linux/in.h>
  23 #include <linux/in6.h>
  24 #include <linux/slab.h>
  25 #include <linux/mempool.h>
  26 #include <linux/workqueue.h>
  27 #include "cifs_fs_sb.h"
  28 #include "cifsacl.h"
  29 #include <crypto/internal/hash.h>
  30 #include <linux/scatterlist.h>
  31 #include <uapi/linux/cifs/cifs_mount.h>
  32 #include "smb2pdu.h"
  33
  34 #define CIFS_MAGIC_NUMBER 0xFF534D42      /* the first four bytes of SMB PDUs */
  35
  36 #define CIFS_PORT 445
  37 #define RFC1001_PORT 139
  38
  39 /*
  40  * The sizes of various internal tables and strings
  41  */
  42 #define MAX_UID_INFO 16
  43 #define MAX_SES_INFO 2
  44 #define MAX_TCON_INFO 4
  45
  46 #define MAX_TREE_SIZE (2 + CIFS_NI_MAXHOST + 1 + CIFS_MAX_SHARE_LEN + 1)
  47
  48 #define CIFS_MIN_RCV_POOL 4
  49
  50 #define MAX_REOPEN_ATT  5 /* these many maximum attempts to reopen a file */
  51 /*
  52  * default attribute cache timeout (jiffies)
  53  */
  54 #define CIFS_DEF_ACTIMEO (1 * HZ)
  55
  56 /*
  57  * max attribute cache timeout (jiffies) - 2^30
  58  */
  59 #define CIFS_MAX_ACTIMEO (1 << 30)
  60
  61 /*
  62  * MAX_REQ is the maximum number of requests that WE will send
  63  * on one socket concurrently.
  64  */
  65 #define CIFS_MAX_REQ 32767
  66
  67 #define RFC1001_NAME_LEN 15
  68 #define RFC1001_NAME_LEN_WITH_NULL (RFC1001_NAME_LEN + 1)
  69
  70 /* maximum length of ip addr as a string (including ipv6 and sctp) */
  71 #define SERVER_NAME_LENGTH 80
  72 #define SERVER_NAME_LEN_WITH_NULL     (SERVER_NAME_LENGTH + 1)
  73
  74 /* echo interval in seconds */
  75 #define SMB_ECHO_INTERVAL_MIN 1
  76 #define SMB_ECHO_INTERVAL_MAX 600
  77 #define SMB_ECHO_INTERVAL_DEFAULT 60
  78
  79 /*
  80  * Default number of credits to keep available for SMB3.
  81  * This value is chosen somewhat arbitrarily. The Windows client
  82  * defaults to 128 credits, the Windows server allows clients up to
  83  * 512 credits (or 8K for later versions), and the NetApp server
  84  * does not limit clients at all.  Choose a high enough default value
  85  * such that the client shouldn't limit performance, but allow mount
  86  * to override (until you approach 64K, where we limit credits to 65000
  87  * to reduce possibility of seeing more server credit overflow bugs.
  88  */
  89 #define SMB2_MAX_CREDITS_AVAILABLE 32000
  90
  91 #include "cifspdu.h"
  92
  93 #ifndef XATTR_DOS_ATTRIB
  94 #define XATTR_DOS_ATTRIB "user.DOSATTRIB"
  95 #endif
  96
  97 /*
  98  * CIFS vfs client Status information (based on what we know.)
  99  */
 100
 101 /* associated with each tcp and smb session */
 102 enum statusEnum {
 103         CifsNew = 0,
 104         CifsGood,
 105         CifsExiting,
 106         CifsNeedReconnect,
 107         CifsNeedNegotiate
 108 };
 109
 110 enum securityEnum {
 111         Unspecified = 0,        /* not specified */
 112         LANMAN,                 /* Legacy LANMAN auth */
 113         NTLM,                   /* Legacy NTLM012 auth with NTLM hash */
 114         NTLMv2,                 /* Legacy NTLM auth with NTLMv2 hash */
 115         RawNTLMSSP,             /* NTLMSSP without SPNEGO, NTLMv2 hash */
 116         Kerberos,               /* Kerberos via SPNEGO */
 117 };
 118
 119 struct session_key {
 120         unsigned int len;
 121         char *response;
 122 };
 123
 124 /* crypto security descriptor definition */
 125 struct sdesc {
 126         struct shash_desc shash;
 127         char ctx[];
 128 };
 129
 130 /* crypto hashing related structure/fields, not specific to a sec mech */
 131 struct cifs_secmech {
 132         struct crypto_shash *hmacmd5; /* hmac-md5 hash function */
 133         struct crypto_shash *md5; /* md5 hash function */
 134         struct crypto_shash *hmacsha256; /* hmac-sha256 hash function */
 135         struct crypto_shash *cmacaes; /* block-cipher based MAC function */
 136         struct crypto_shash *sha512; /* sha512 hash function */
 137         struct sdesc *sdeschmacmd5;  /* ctxt to generate ntlmv2 hash, CR1 */
 138         struct sdesc *sdescmd5; /* ctxt to generate cifs/smb signature */
 139         struct sdesc *sdeschmacsha256;  /* ctxt to generate smb2 signature */
 140         struct sdesc *sdesccmacaes;  /* ctxt to generate smb3 signature */
 141         struct sdesc *sdescsha512; /* ctxt to generate smb3.11 signing key */
 142         struct crypto_aead *ccmaesencrypt; /* smb3 encryption aead */
 143         struct crypto_aead *ccmaesdecrypt; /* smb3 decryption aead */
 144 };
 145
 146 /* per smb session structure/fields */
 147 struct ntlmssp_auth {
 148         bool sesskey_per_smbsess; /* whether session key is per smb session */
 149         __u32 client_flags; /* sent by client in type 1 ntlmsssp exchange */
 150         __u32 server_flags; /* sent by server in type 2 ntlmssp exchange */
 151         unsigned char ciphertext[CIFS_CPHTXT_SIZE]; /* sent to server */
 152         char cryptkey[CIFS_CRYPTO_KEY_SIZE]; /* used by ntlmssp */
 153 };
 154
 155 struct cifs_cred {
 156         int uid;
 157         int gid;
 158         int mode;
 159         int cecount;
 160         struct cifs_sid osid;
 161         struct cifs_sid gsid;
 162         struct cifs_ntace *ntaces;
 163         struct cifs_ace *aces;
 164 };
 165
 166 /*
 167  *****************************************************************
 168  * Except the CIFS PDUs themselves all the
 169  * globally interesting structs should go here
 170  *****************************************************************
 171  */
 172
 173 /*
 174  * A smb_rqst represents a complete request to be issued to a server. It's
 175  * formed by a kvec array, followed by an array of pages. Page data is assumed
 176  * to start at the beginning of the first page.
 177  */
 178 struct smb_rqst {
 179         struct kvec     *rq_iov;        /* array of kvecs */
 180         unsigned int    rq_nvec;        /* number of kvecs in array */
 181         struct page     **rq_pages;     /* pointer to array of page ptrs */
 182         unsigned int    rq_offset;      /* the offset to the 1st page */
 183         unsigned int    rq_npages;      /* number pages in array */
 184         unsigned int    rq_pagesz;      /* page size to use */
 185         unsigned int    rq_tailsz;      /* length of last page */
 186 };
 187
 188 enum smb_version {
 189         Smb_1 = 1,
 190         Smb_20,
 191         Smb_21,
 192         Smb_30,
 193         Smb_302,
 194 #ifdef CONFIG_CIFS_SMB311
 195         Smb_311,
 196 #endif /* SMB311 */
 197         Smb_3any,
 198         Smb_default,
 199         Smb_version_err
 200 };
 201
 202 struct mid_q_entry;
 203 struct TCP_Server_Info;
 204 struct cifsFileInfo;
 205 struct cifs_ses;
 206 struct cifs_tcon;
 207 struct dfs_info3_param;
 208 struct cifs_fattr;
 209 struct smb_vol;
 210 struct cifs_fid;
 211 struct cifs_readdata;
 212 struct cifs_writedata;
 213 struct cifs_io_parms;
 214 struct cifs_search_info;
 215 struct cifsInodeInfo;
 216 struct cifs_open_parms;
 217
 218 struct smb_version_operations {
 219         int (*send_cancel)(struct TCP_Server_Info *, struct smb_rqst *,
 220                            struct mid_q_entry *);
 221         bool (*compare_fids)(struct cifsFileInfo *, struct cifsFileInfo *);
 222         /* setup request: allocate mid, sign message */
 223         struct mid_q_entry *(*setup_request)(struct cifs_ses *,
 224                                                 struct smb_rqst *);
 225         /* setup async request: allocate mid, sign message */
 226         struct mid_q_entry *(*setup_async_request)(struct TCP_Server_Info *,
 227                                                 struct smb_rqst *);
 228         /* check response: verify signature, map error */
 229         int (*check_receive)(struct mid_q_entry *, struct TCP_Server_Info *,
 230                              bool);
 231         void (*add_credits)(struct TCP_Server_Info *, const unsigned int,
 232                             const int);
 233         void (*set_credits)(struct TCP_Server_Info *, const int);
 234         int * (*get_credits_field)(struct TCP_Server_Info *, const int);
 235         unsigned int (*get_credits)(struct mid_q_entry *);
 236         __u64 (*get_next_mid)(struct TCP_Server_Info *);
 237         /* data offset from read response message */
 238         unsigned int (*read_data_offset)(char *);
 239         /*
 240          * Data length from read response message
 241          * When in_remaining is true, the returned data length is in
 242          * message field DataRemaining for out-of-band data read (e.g through
 243          * Memory Registration RDMA write in SMBD).
 244          * Otherwise, the returned data length is in message field DataLength.
 245          */
 246         unsigned int (*read_data_length)(char *, bool in_remaining);
 247         /* map smb to linux error */
 248         int (*map_error)(char *, bool);
 249         /* find mid corresponding to the response message */
 250         struct mid_q_entry * (*find_mid)(struct TCP_Server_Info *, char *);
 251         void (*dump_detail)(void *buf, struct TCP_Server_Info *ptcp_info);
 252         void (*clear_stats)(struct cifs_tcon *);
 253         void (*print_stats)(struct seq_file *m, struct cifs_tcon *);
 254         void (*dump_share_caps)(struct seq_file *, struct cifs_tcon *);
 255         /* verify the message */
 256         int (*check_message)(char *, unsigned int, struct TCP_Server_Info *);
 257         bool (*is_oplock_break)(char *, struct TCP_Server_Info *);
 258         int (*handle_cancelled_mid)(char *, struct TCP_Server_Info *);
 259         void (*downgrade_oplock)(struct TCP_Server_Info *,
 260                                         struct cifsInodeInfo *, bool);
 261         /* process transaction2 response */
 262         bool (*check_trans2)(struct mid_q_entry *, struct TCP_Server_Info *,
 263                              char *, int);
 264         /* check if we need to negotiate */
 265         bool (*need_neg)(struct TCP_Server_Info *);
 266         /* negotiate to the server */
 267         int (*negotiate)(const unsigned int, struct cifs_ses *);
 268         /* set negotiated write size */
 269         unsigned int (*negotiate_wsize)(struct cifs_tcon *, struct smb_vol *);
 270         /* set negotiated read size */
 271         unsigned int (*negotiate_rsize)(struct cifs_tcon *, struct smb_vol *);
 272         /* setup smb sessionn */
 273         int (*sess_setup)(const unsigned int, struct cifs_ses *,
 274                           const struct nls_table *);
 275         /* close smb session */
 276         int (*logoff)(const unsigned int, struct cifs_ses *);
 277         /* connect to a server share */
 278         int (*tree_connect)(const unsigned int, struct cifs_ses *, const char *,
 279                             struct cifs_tcon *, const struct nls_table *);
 280         /* close tree connecion */
 281         int (*tree_disconnect)(const unsigned int, struct cifs_tcon *);
 282         /* get DFS referrals */
 283         int (*get_dfs_refer)(const unsigned int, struct cifs_ses *,
 284                              const char *, struct dfs_info3_param **,
 285                              unsigned int *, const struct nls_table *, int);
 286         /* informational QFS call */
 287         void (*qfs_tcon)(const unsigned int, struct cifs_tcon *);
 288         /* check if a path is accessible or not */
 289         int (*is_path_accessible)(const unsigned int, struct cifs_tcon *,
 290                                   struct cifs_sb_info *, const char *);
 291         /* query path data from the server */
 292         int (*query_path_info)(const unsigned int, struct cifs_tcon *,
 293                                struct cifs_sb_info *, const char *,
 294                                FILE_ALL_INFO *, bool *, bool *);
 295         /* query file data from the server */
 296         int (*query_file_info)(const unsigned int, struct cifs_tcon *,
 297                                struct cifs_fid *, FILE_ALL_INFO *);
 298         /* get server index number */
 299         int (*get_srv_inum)(const unsigned int, struct cifs_tcon *,
 300                             struct cifs_sb_info *, const char *,
 301                             u64 *uniqueid, FILE_ALL_INFO *);
 302         /* set size by path */
 303         int (*set_path_size)(const unsigned int, struct cifs_tcon *,
 304                              const char *, __u64, struct cifs_sb_info *, bool);
 305         /* set size by file handle */
 306         int (*set_file_size)(const unsigned int, struct cifs_tcon *,
 307                              struct cifsFileInfo *, __u64, bool);
 308         /* set attributes */
 309         int (*set_file_info)(struct inode *, const char *, FILE_BASIC_INFO *,
 310                              const unsigned int);
 311         int (*set_compression)(const unsigned int, struct cifs_tcon *,
 312                                struct cifsFileInfo *);
 313         /* check if we can send an echo or nor */
 314         bool (*can_echo)(struct TCP_Server_Info *);
 315         /* send echo request */
 316         int (*echo)(struct TCP_Server_Info *);
 317         /* create directory */
 318         int (*posix_mkdir)(const unsigned int xid, struct inode *inode,
 319                         umode_t mode, struct cifs_tcon *tcon,
 320                         const char *full_path,
 321                         struct cifs_sb_info *cifs_sb);
 322         int (*mkdir)(const unsigned int, struct cifs_tcon *, const char *,
 323                      struct cifs_sb_info *);
 324         /* set info on created directory */
 325         void (*mkdir_setinfo)(struct inode *, const char *,
 326                               struct cifs_sb_info *, struct cifs_tcon *,
 327                               const unsigned int);
 328         /* remove directory */
 329         int (*rmdir)(const unsigned int, struct cifs_tcon *, const char *,
 330                      struct cifs_sb_info *);
 331         /* unlink file */
 332         int (*unlink)(const unsigned int, struct cifs_tcon *, const char *,
 333                       struct cifs_sb_info *);
 334         /* open, rename and delete file */
 335         int (*rename_pending_delete)(const char *, struct dentry *,
 336                                      const unsigned int);
 337         /* send rename request */
 338         int (*rename)(const unsigned int, struct cifs_tcon *, const char *,
 339                       const char *, struct cifs_sb_info *);
 340         /* send create hardlink request */
 341         int (*create_hardlink)(const unsigned int, struct cifs_tcon *,
 342                                const char *, const char *,
 343                                struct cifs_sb_info *);
 344         /* query symlink target */
 345         int (*query_symlink)(const unsigned int, struct cifs_tcon *,
 346                              const char *, char **, struct cifs_sb_info *);
 347         /* open a file for non-posix mounts */
 348         int (*open)(const unsigned int, struct cifs_open_parms *,
 349                     __u32 *, FILE_ALL_INFO *);
 350         /* set fid protocol-specific info */
 351         void (*set_fid)(struct cifsFileInfo *, struct cifs_fid *, __u32);
 352         /* close a file */
 353         void (*close)(const unsigned int, struct cifs_tcon *,
 354                       struct cifs_fid *);
 355         /* send a flush request to the server */
 356         int (*flush)(const unsigned int, struct cifs_tcon *, struct cifs_fid *);
 357         /* async read from the server */
 358         int (*async_readv)(struct cifs_readdata *);
 359         /* async write to the server */
 360         int (*async_writev)(struct cifs_writedata *,
 361                             void (*release)(struct kref *));
 362         /* sync read from the server */
 363         int (*sync_read)(const unsigned int, struct cifs_fid *,
 364                          struct cifs_io_parms *, unsigned int *, char **,
 365                          int *);
 366         /* sync write to the server */
 367         int (*sync_write)(const unsigned int, struct cifs_fid *,
 368                           struct cifs_io_parms *, unsigned int *, struct kvec *,
 369                           unsigned long);
 370         /* open dir, start readdir */
 371         int (*query_dir_first)(const unsigned int, struct cifs_tcon *,
 372                                const char *, struct cifs_sb_info *,
 373                                struct cifs_fid *, __u16,
 374                                struct cifs_search_info *);
 375         /* continue readdir */
 376         int (*query_dir_next)(const unsigned int, struct cifs_tcon *,
 377                               struct cifs_fid *,
 378                               __u16, struct cifs_search_info *srch_inf);
 379         /* close dir */
 380         int (*close_dir)(const unsigned int, struct cifs_tcon *,
 381                          struct cifs_fid *);
 382         /* calculate a size of SMB message */
 383         unsigned int (*calc_smb_size)(void *buf, struct TCP_Server_Info *ptcpi);
 384         /* check for STATUS_PENDING and process it in a positive case */
 385         bool (*is_status_pending)(char *, struct TCP_Server_Info *, int);
 386         /* check for STATUS_NETWORK_SESSION_EXPIRED */
 387         bool (*is_session_expired)(char *);
 388         /* send oplock break response */
 389         int (*oplock_response)(struct cifs_tcon *, struct cifs_fid *,
 390                                struct cifsInodeInfo *);
 391         /* query remote filesystem */
 392         int (*queryfs)(const unsigned int, struct cifs_tcon *,
 393                        struct kstatfs *);
 394         /* send mandatory brlock to the server */
 395         int (*mand_lock)(const unsigned int, struct cifsFileInfo *, __u64,
 396                          __u64, __u32, int, int, bool);
 397         /* unlock range of mandatory locks */
 398         int (*mand_unlock_range)(struct cifsFileInfo *, struct file_lock *,
 399                                  const unsigned int);
 400         /* push brlocks from the cache to the server */
 401         int (*push_mand_locks)(struct cifsFileInfo *);
 402         /* get lease key of the inode */
 403         void (*get_lease_key)(struct inode *, struct cifs_fid *);
 404         /* set lease key of the inode */
 405         void (*set_lease_key)(struct inode *, struct cifs_fid *);
 406         /* generate new lease key */
 407         void (*new_lease_key)(struct cifs_fid *);
 408         int (*generate_signingkey)(struct cifs_ses *);
 409         int (*calc_signature)(struct smb_rqst *, struct TCP_Server_Info *);
 410         int (*set_integrity)(const unsigned int, struct cifs_tcon *tcon,
 411                              struct cifsFileInfo *src_file);
 412         int (*enum_snapshots)(const unsigned int xid, struct cifs_tcon *tcon,
 413                              struct cifsFileInfo *src_file, void __user *);
 414         int (*query_mf_symlink)(unsigned int, struct cifs_tcon *,
 415                                 struct cifs_sb_info *, const unsigned char *,
 416                                 char *, unsigned int *);
 417         int (*create_mf_symlink)(unsigned int, struct cifs_tcon *,
 418                                  struct cifs_sb_info *, const unsigned char *,
 419                                  char *, unsigned int *);
 420         /* if we can do cache read operations */
 421         bool (*is_read_op)(__u32);
 422         /* set oplock level for the inode */
 423         void (*set_oplock_level)(struct cifsInodeInfo *, __u32, unsigned int,
 424                                  bool *);
 425         /* create lease context buffer for CREATE request */
 426         char * (*create_lease_buf)(u8 *, u8);
 427         /* parse lease context buffer and return oplock/epoch info */
 428         __u8 (*parse_lease_buf)(void *buf, unsigned int *epoch, char *lkey);
 429         ssize_t (*copychunk_range)(const unsigned int,
 430                         struct cifsFileInfo *src_file,
 431                         struct cifsFileInfo *target_file,
 432                         u64 src_off, u64 len, u64 dest_off);
 433         int (*duplicate_extents)(const unsigned int, struct cifsFileInfo *src,
 434                         struct cifsFileInfo *target_file, u64 src_off, u64 len,
 435                         u64 dest_off);
 436         int (*validate_negotiate)(const unsigned int, struct cifs_tcon *);
 437         ssize_t (*query_all_EAs)(const unsigned int, struct cifs_tcon *,
 438                         const unsigned char *, const unsigned char *, char *,
 439                         size_t, struct cifs_sb_info *);
 440         int (*set_EA)(const unsigned int, struct cifs_tcon *, const char *,
 441                         const char *, const void *, const __u16,
 442                         const struct nls_table *, struct cifs_sb_info *);
 443         struct cifs_ntsd * (*get_acl)(struct cifs_sb_info *, struct inode *,
 444                         const char *, u32 *);
 445         struct cifs_ntsd * (*get_acl_by_fid)(struct cifs_sb_info *,
 446                         const struct cifs_fid *, u32 *);
 447         int (*set_acl)(struct cifs_ntsd *, __u32, struct inode *, const char *,
 448                         int);
 449         /* writepages retry size */
 450         unsigned int (*wp_retry_size)(struct inode *);
 451         /* get mtu credits */
 452         int (*wait_mtu_credits)(struct TCP_Server_Info *, unsigned int,
 453                                 unsigned int *, unsigned int *);
 454         /* check if we need to issue closedir */
 455         bool (*dir_needs_close)(struct cifsFileInfo *);
 456         long (*fallocate)(struct file *, struct cifs_tcon *, int, loff_t,
 457                           loff_t);
 458         /* init transform request - used for encryption for now */
 459         int (*init_transform_rq)(struct TCP_Server_Info *, struct smb_rqst *,
 460                                  struct smb_rqst *);
 461         /* free transform request */
 462         void (*free_transform_rq)(struct smb_rqst *);
 463         int (*is_transform_hdr)(void *buf);
 464         int (*receive_transform)(struct TCP_Server_Info *,
 465                                  struct mid_q_entry **);
 466         enum securityEnum (*select_sectype)(struct TCP_Server_Info *,
 467                             enum securityEnum);
 468         int (*next_header)(char *);
 469 };
 470
 471 struct smb_version_values {
 472         char            *version_string;
 473         __u16           protocol_id;
 474         __u32           req_capabilities;
 475         __u32           large_lock_type;
 476         __u32           exclusive_lock_type;
 477         __u32           shared_lock_type;
 478         __u32           unlock_lock_type;
 479         size_t          header_preamble_size;
 480         size_t          header_size;
 481         size_t          max_header_size;
 482         size_t          read_rsp_size;
 483         __le16          lock_cmd;
 484         unsigned int    cap_unix;
 485         unsigned int    cap_nt_find;
 486         unsigned int    cap_large_files;
 487         __u16           signing_enabled;
 488         __u16           signing_required;
 489         size_t          create_lease_size;
 490 };
 491
 492 #define HEADER_SIZE(server) (server->vals->header_size)
 493 #define MAX_HEADER_SIZE(server) (server->vals->max_header_size)
 494
 495 struct smb_vol {
 496         char *username;
 497         char *password;
 498         char *domainname;
 499         char *UNC;
 500         char *iocharset;  /* local code page for mapping to and from Unicode */
 501         char source_rfc1001_name[RFC1001_NAME_LEN_WITH_NULL]; /* clnt nb name */
 502         char target_rfc1001_name[RFC1001_NAME_LEN_WITH_NULL]; /* srvr nb name */
 503         kuid_t cred_uid;
 504         kuid_t linux_uid;
 505         kgid_t linux_gid;
 506         kuid_t backupuid;
 507         kgid_t backupgid;
 508         umode_t file_mode;
 509         umode_t dir_mode;
 510         enum securityEnum sectype; /* sectype requested via mnt opts */
 511         bool sign; /* was signing requested via mnt opts? */
 512         bool retry:1;
 513         bool intr:1;
 514         bool setuids:1;
 515         bool setuidfromacl:1;
 516         bool override_uid:1;
 517         bool override_gid:1;
 518         bool dynperm:1;
 519         bool noperm:1;
 520         bool no_psx_acl:1; /* set if posix acl support should be disabled */
 521         bool cifs_acl:1;
 522         bool backupuid_specified; /* mount option  backupuid  is specified */
 523         bool backupgid_specified; /* mount option  backupgid  is specified */
 524         bool no_xattr:1;   /* set if xattr (EA) support should be disabled*/
 525         bool server_ino:1; /* use inode numbers from server ie UniqueId */
 526         bool direct_io:1;
 527         bool strict_io:1; /* strict cache behavior */
 528         bool remap:1;      /* set to remap seven reserved chars in filenames */
 529         bool sfu_remap:1;  /* remap seven reserved chars ala SFU */
 530         bool posix_paths:1; /* unset to not ask for posix pathnames. */
 531         bool no_linux_ext:1;
 532         bool linux_ext:1;
 533         bool sfu_emul:1;
 534         bool nullauth:1;   /* attempt to authenticate with null user */
 535         bool nocase:1;     /* request case insensitive filenames */
 536         bool nobrl:1;      /* disable sending byte range locks to srv */
 537         bool nohandlecache:1; /* disable caching dir handles if srvr probs */
 538         bool mand_lock:1;  /* send mandatory not posix byte range lock reqs */
 539         bool seal:1;       /* request transport encryption on share */
 540         bool nodfs:1;      /* Do not request DFS, even if available */
 541         bool local_lease:1; /* check leases only on local system, not remote */
 542         bool noblocksnd:1;
 543         bool noautotune:1;
 544         bool nostrictsync:1; /* do not force expensive SMBflush on every sync */
 545         bool fsc:1;     /* enable fscache */
 546         bool mfsymlinks:1; /* use Minshall+French Symlinks */
 547         bool multiuser:1;
 548         bool rwpidforward:1; /* pid forward for read/write operations */
 549         bool nosharesock:1;
 550         bool persistent:1;
 551         bool nopersistent:1;
 552         bool resilient:1; /* noresilient not required since not fored for CA */
 553         bool domainauto:1;
 554         bool rdma:1;
 555         unsigned int rsize;
 556         unsigned int wsize;
 557         bool sockopt_tcp_nodelay:1;
 558         unsigned long actimeo; /* attribute cache timeout (jiffies) */
 559         struct smb_version_operations *ops;
 560         struct smb_version_values *vals;
 561         char *prepath;
 562         struct sockaddr_storage dstaddr; /* destination address */
 563         struct sockaddr_storage srcaddr; /* allow binding to a local IP */
 564         struct nls_table *local_nls;
 565         unsigned int echo_interval; /* echo interval in secs */
 566         __u64 snapshot_time; /* needed for timewarp tokens */
 567         unsigned int max_credits; /* smb3 max_credits 10 < credits < 60000 */
 568 };
 569
 570 #define CIFS_MOUNT_MASK (CIFS_MOUNT_NO_PERM | CIFS_MOUNT_SET_UID | \
 571                          CIFS_MOUNT_SERVER_INUM | CIFS_MOUNT_DIRECT_IO | \
 572                          CIFS_MOUNT_NO_XATTR | CIFS_MOUNT_MAP_SPECIAL_CHR | \
 573                          CIFS_MOUNT_MAP_SFM_CHR | \
 574                          CIFS_MOUNT_UNX_EMUL | CIFS_MOUNT_NO_BRL | \
 575                          CIFS_MOUNT_CIFS_ACL | CIFS_MOUNT_OVERR_UID | \
 576                          CIFS_MOUNT_OVERR_GID | CIFS_MOUNT_DYNPERM | \
 577                          CIFS_MOUNT_NOPOSIXBRL | CIFS_MOUNT_NOSSYNC | \
 578                          CIFS_MOUNT_FSCACHE | CIFS_MOUNT_MF_SYMLINKS | \
 579                          CIFS_MOUNT_MULTIUSER | CIFS_MOUNT_STRICT_IO | \
 580                          CIFS_MOUNT_CIFS_BACKUPUID | CIFS_MOUNT_CIFS_BACKUPGID)
 581
 582 #define CIFS_MS_MASK (SB_RDONLY | SB_MANDLOCK | SB_NOEXEC | SB_NOSUID | \
 583                       SB_NODEV | SB_SYNCHRONOUS)
 584
 585 struct cifs_mnt_data {
 586         struct cifs_sb_info *cifs_sb;
 587         struct smb_vol *vol;
 588         int flags;
 589 };
 590
 591 static inline unsigned int
 592 get_rfc1002_length(void *buf)
 593 {
 594         return be32_to_cpu(*((__be32 *)buf)) & 0xffffff;
 595 }
 596
 597 static inline void
 598 inc_rfc1001_len(void *buf, int count)
 599 {
 600         be32_add_cpu((__be32 *)buf, count);
 601 }
 602
 603 struct TCP_Server_Info {
 604         struct list_head tcp_ses_list;
 605         struct list_head smb_ses_list;
 606         int srv_count; /* reference counter */
 607         /* 15 character server name + 0x20 16th byte indicating type = srv */
 608         char server_RFC1001_name[RFC1001_NAME_LEN_WITH_NULL];
 609         struct smb_version_operations   *ops;
 610         struct smb_version_values       *vals;
 611         enum statusEnum tcpStatus; /* what we think the status is */
 612         char *hostname; /* hostname portion of UNC string */
 613         struct socket *ssocket;
 614         struct sockaddr_storage dstaddr;
 615         struct sockaddr_storage srcaddr; /* locally bind to this IP */
 616 #ifdef CONFIG_NET_NS
 617         struct net *net;
 618 #endif
 619         wait_queue_head_t response_q;
 620         wait_queue_head_t request_q; /* if more than maxmpx to srvr must block*/
 621         struct list_head pending_mid_q;
 622         bool noblocksnd;                /* use blocking sendmsg */
 623         bool noautotune;                /* do not autotune send buf sizes */
 624         bool tcp_nodelay;
 625         unsigned int credits;  /* send no more requests at once */
 626         unsigned int max_credits; /* can override large 32000 default at mnt */
 627         unsigned int in_flight;  /* number of requests on the wire to server */
 628         spinlock_t req_lock;  /* protect the two values above */
 629         struct mutex srv_mutex;
 630         struct task_struct *tsk;
 631         char server_GUID[16];
 632         __u16 sec_mode;
 633         bool sign; /* is signing enabled on this connection? */
 634         bool session_estab; /* mark when very first sess is established */
 635         int echo_credits;  /* echo reserved slots */
 636         int oplock_credits;  /* oplock break reserved slots */
 637         bool echoes:1; /* enable echoes */
 638         __u8 client_guid[SMB2_CLIENT_GUID_SIZE]; /* Client GUID */
 639         u16 dialect; /* dialect index that server chose */
 640         bool oplocks:1; /* enable oplocks */
 641         unsigned int maxReq;    /* Clients should submit no more */
 642         /* than maxReq distinct unanswered SMBs to the server when using  */
 643         /* multiplexed reads or writes (for SMB1/CIFS only, not SMB2/SMB3) */
 644         unsigned int maxBuf;    /* maxBuf specifies the maximum */
 645         /* message size the server can send or receive for non-raw SMBs */
 646         /* maxBuf is returned by SMB NegotiateProtocol so maxBuf is only 0 */
 647         /* when socket is setup (and during reconnect) before NegProt sent */
 648         unsigned int max_rw;    /* maxRw specifies the maximum */
 649         /* message size the server can send or receive for */
 650         /* SMB_COM_WRITE_RAW or SMB_COM_READ_RAW. */
 651         unsigned int capabilities; /* selective disabling of caps by smb sess */
 652         int timeAdj;  /* Adjust for difference in server time zone in sec */
 653         __u64 CurrentMid;         /* multiplex id - rotating counter */
 654         char cryptkey[CIFS_CRYPTO_KEY_SIZE]; /* used by ntlm, ntlmv2 etc */
 655         /* 16th byte of RFC1001 workstation name is always null */
 656         char workstation_RFC1001_name[RFC1001_NAME_LEN_WITH_NULL];
 657         __u32 sequence_number; /* for signing, protected by srv_mutex */
 658         struct session_key session_key;
 659         unsigned long lstrp; /* when we got last response from this server */
 660         struct cifs_secmech secmech; /* crypto sec mech functs, descriptors */
 661 #define CIFS_NEGFLAVOR_LANMAN   0       /* wct == 13, LANMAN */
 662 #define CIFS_NEGFLAVOR_UNENCAP  1       /* wct == 17, but no ext_sec */
 663 #define CIFS_NEGFLAVOR_EXTENDED 2       /* wct == 17, ext_sec bit set */
 664         char    negflavor;      /* NEGOTIATE response flavor */
 665         /* extended security flavors that server supports */
 666         bool    sec_ntlmssp;            /* supports NTLMSSP */
 667         bool    sec_kerberosu2u;        /* supports U2U Kerberos */
 668         bool    sec_kerberos;           /* supports plain Kerberos */
 669         bool    sec_mskerberos;         /* supports legacy MS Kerberos */
 670         bool    large_buf;              /* is current buffer large? */
 671         /* use SMBD connection instead of socket */
 672         bool    rdma;
 673         /* point to the SMBD connection if RDMA is used instead of socket */
 674         struct smbd_connection *smbd_conn;
 675         struct delayed_work     echo; /* echo ping workqueue job */
 676         char    *smallbuf;      /* pointer to current "small" buffer */
 677         char    *bigbuf;        /* pointer to current "big" buffer */
 678         /* Total size of this PDU. Only valid from cifs_demultiplex_thread */
 679         unsigned int pdu_size;
 680         unsigned int total_read; /* total amount of data read in this pass */
 681 #ifdef CONFIG_CIFS_FSCACHE
 682         struct fscache_cookie   *fscache; /* client index cache cookie */
 683 #endif
 684 #ifdef CONFIG_CIFS_STATS2
 685         atomic_t in_send; /* requests trying to send */
 686         atomic_t num_waiters;   /* blocked waiting to get in sendrecv */
 687 #endif
 688         unsigned int    max_read;
 689         unsigned int    max_write;
 690 #ifdef CONFIG_CIFS_SMB311
 691         __le16  cipher_type;
 692          /* save initital negprot hash */
 693         __u8    preauth_sha_hash[SMB2_PREAUTH_HASH_SIZE];
 694         bool    posix_ext_supported;
 695 #endif /* 3.1.1 */
 696         struct delayed_work reconnect; /* reconnect workqueue job */
 697         struct mutex reconnect_mutex; /* prevent simultaneous reconnects */
 698         unsigned long echo_interval;
 699 };
 700
 701 static inline unsigned int
 702 in_flight(struct TCP_Server_Info *server)
 703 {
 704         unsigned int num;
 705         spin_lock(&server->req_lock);
 706         num = server->in_flight;
 707         spin_unlock(&server->req_lock);
 708         return num;
 709 }
 710
 711 static inline bool
 712 has_credits(struct TCP_Server_Info *server, int *credits)
 713 {
 714         int num;
 715         spin_lock(&server->req_lock);
 716         num = *credits;
 717         spin_unlock(&server->req_lock);
 718         return num > 0;
 719 }
 720
 721 static inline void
 722 add_credits(struct TCP_Server_Info *server, const unsigned int add,
 723             const int optype)
 724 {
 725         server->ops->add_credits(server, add, optype);
 726 }
 727
 728 static inline void
 729 add_credits_and_wake_if(struct TCP_Server_Info *server, const unsigned int add,
 730                         const int optype)
 731 {
 732         if (add) {
 733                 server->ops->add_credits(server, add, optype);
 734                 wake_up(&server->request_q);
 735         }
 736 }
 737
 738 static inline void
 739 set_credits(struct TCP_Server_Info *server, const int val)
 740 {
 741         server->ops->set_credits(server, val);
 742 }
 743
 744 static inline __le64
 745 get_next_mid64(struct TCP_Server_Info *server)
 746 {
 747         return cpu_to_le64(server->ops->get_next_mid(server));
 748 }
 749
 750 static inline __le16
 751 get_next_mid(struct TCP_Server_Info *server)
 752 {
 753         __u16 mid = server->ops->get_next_mid(server);
 754         /*
 755          * The value in the SMB header should be little endian for easy
 756          * on-the-wire decoding.
 757          */
 758         return cpu_to_le16(mid);
 759 }
 760
 761 static inline __u16
 762 get_mid(const struct smb_hdr *smb)
 763 {
 764         return le16_to_cpu(smb->Mid);
 765 }
 766
 767 static inline bool
 768 compare_mid(__u16 mid, const struct smb_hdr *smb)
 769 {
 770         return mid == le16_to_cpu(smb->Mid);
 771 }
 772
 773 /*
 774  * When the server supports very large reads and writes via POSIX extensions,
 775  * we can allow up to 2^24-1, minus the size of a READ/WRITE_AND_X header, not
 776  * including the RFC1001 length.
 777  *
 778  * Note that this might make for "interesting" allocation problems during
 779  * writeback however as we have to allocate an array of pointers for the
 780  * pages. A 16M write means ~32kb page array with PAGE_SIZE == 4096.
 781  *
 782  * For reads, there is a similar problem as we need to allocate an array
 783  * of kvecs to handle the receive, though that should only need to be done
 784  * once.
 785  */
 786 #define CIFS_MAX_WSIZE ((1<<24) - 1 - sizeof(WRITE_REQ) + 4)
 787 #define CIFS_MAX_RSIZE ((1<<24) - sizeof(READ_RSP) + 4)
 788
 789 /*
 790  * When the server doesn't allow large posix writes, only allow a rsize/wsize
 791  * of 2^17-1 minus the size of the call header. That allows for a read or
 792  * write up to the maximum size described by RFC1002.
 793  */
 794 #define CIFS_MAX_RFC1002_WSIZE ((1<<17) - 1 - sizeof(WRITE_REQ) + 4)
 795 #define CIFS_MAX_RFC1002_RSIZE ((1<<17) - 1 - sizeof(READ_RSP) + 4)
 796
 797 /*
 798  * The default wsize is 1M. find_get_pages seems to return a maximum of 256
 799  * pages in a single call. With PAGE_SIZE == 4k, this means we can fill
 800  * a single wsize request with a single call.
 801  */
 802 #define CIFS_DEFAULT_IOSIZE (1024 * 1024)
 803
 804 /*
 805  * Windows only supports a max of 60kb reads and 65535 byte writes. Default to
 806  * those values when posix extensions aren't in force. In actuality here, we
 807  * use 65536 to allow for a write that is a multiple of 4k. Most servers seem
 808  * to be ok with the extra byte even though Windows doesn't send writes that
 809  * are that large.
 810  *
 811  * Citation:
 812  *
 813  * http://blogs.msdn.com/b/openspecification/archive/2009/04/10/smb-maximum-transmit-buffer-size-and-performance-tuning.aspx
 814  */
 815 #define CIFS_DEFAULT_NON_POSIX_RSIZE (60 * 1024)
 816 #define CIFS_DEFAULT_NON_POSIX_WSIZE (65536)
 817
 818 /*
 819  * Macros to allow the TCP_Server_Info->net field and related code to drop out
 820  * when CONFIG_NET_NS isn't set.
 821  */
 822
 823 #ifdef CONFIG_NET_NS
 824
 825 static inline struct net *cifs_net_ns(struct TCP_Server_Info *srv)
 826 {
 827         return srv->net;
 828 }
 829
 830 static inline void cifs_set_net_ns(struct TCP_Server_Info *srv, struct net *net)
 831 {
 832         srv->net = net;
 833 }
 834
 835 #else
 836
 837 static inline struct net *cifs_net_ns(struct TCP_Server_Info *srv)
 838 {
 839         return &init_net;
 840 }
 841
 842 static inline void cifs_set_net_ns(struct TCP_Server_Info *srv, struct net *net)
 843 {
 844 }
 845
 846 #endif
 847
 848 struct cifs_server_iface {
 849         size_t speed;
 850         unsigned int rdma_capable : 1;
 851         unsigned int rss_capable : 1;
 852         struct sockaddr_storage sockaddr;
 853 };
 854
 855 /*
 856  * Session structure.  One of these for each uid session with a particular host
 857  */
 858 struct cifs_ses {
 859         struct list_head smb_ses_list;
 860         struct list_head tcon_list;
 861         struct cifs_tcon *tcon_ipc;
 862         struct mutex session_mutex;
 863         struct TCP_Server_Info *server; /* pointer to server info */
 864         int ses_count;          /* reference counter */
 865         enum statusEnum status;
 866         unsigned overrideSecFlg;  /* if non-zero override global sec flags */
 867         char *serverOS;         /* name of operating system underlying server */
 868         char *serverNOS;        /* name of network operating system of server */
 869         char *serverDomain;     /* security realm of server */
 870         __u64 Suid;             /* remote smb uid  */
 871         kuid_t linux_uid;       /* overriding owner of files on the mount */
 872         kuid_t cred_uid;        /* owner of credentials */
 873         unsigned int capabilities;
 874         char serverName[SERVER_NAME_LEN_WITH_NULL];
 875         char *user_name;        /* must not be null except during init of sess
 876                                    and after mount option parsing we fill it */
 877         char *domainName;
 878         char *password;
 879         struct session_key auth_key;
 880         struct ntlmssp_auth *ntlmssp; /* ciphertext, flags, server challenge */
 881         enum securityEnum sectype; /* what security flavor was specified? */
 882         bool sign;              /* is signing required? */
 883         bool need_reconnect:1; /* connection reset, uid now invalid */
 884         bool domainAuto:1;
 885         __u16 session_flags;
 886         __u8 smb3signingkey[SMB3_SIGN_KEY_SIZE];
 887         __u8 smb3encryptionkey[SMB3_SIGN_KEY_SIZE];
 888         __u8 smb3decryptionkey[SMB3_SIGN_KEY_SIZE];
 889 #ifdef CONFIG_CIFS_SMB311
 890         __u8 preauth_sha_hash[SMB2_PREAUTH_HASH_SIZE];
 891 #endif /* 3.1.1 */
 892
 893         /*
 894          * Network interfaces available on the server this session is
 895          * connected to.
 896          *
 897          * Other channels can be opened by connecting and binding this
 898          * session to interfaces from this list.
 899          *
 900          * iface_lock should be taken when accessing any of these fields
 901          */
 902         spinlock_t iface_lock;
 903         struct cifs_server_iface *iface_list;
 904         size_t iface_count;
 905         unsigned long iface_last_update; /* jiffies */
 906 };
 907
 908 static inline bool
 909 cap_unix(struct cifs_ses *ses)
 910 {
 911         return ses->server->vals->cap_unix & ses->capabilities;
 912 }
 913
 914 struct cached_fid {
 915         bool is_valid:1;        /* Do we have a useable root fid */
 916         struct cifs_fid *fid;
 917         struct mutex fid_mutex;
 918         struct cifs_tcon *tcon;
 919         struct work_struct lease_break;
 920 };
 921
 922 /*
 923  * there is one of these for each connection to a resource on a particular
 924  * session
 925  */
 926 struct cifs_tcon {
 927         struct list_head tcon_list;
 928         int tc_count;
 929         struct list_head rlist; /* reconnect list */
 930         struct list_head openFileList;
 931         spinlock_t open_file_lock; /* protects list above */
 932         struct cifs_ses *ses;   /* pointer to session associated with */
 933         char treeName[MAX_TREE_SIZE + 1]; /* UNC name of resource in ASCII */
 934         char *nativeFileSystem;
 935         char *password;         /* for share-level security */
 936         __u32 tid;              /* The 4 byte tree id */
 937         __u16 Flags;            /* optional support bits */
 938         enum statusEnum tidStatus;
 939 #ifdef CONFIG_CIFS_STATS
 940         atomic_t num_smbs_sent;
 941         union {
 942                 struct {
 943                         atomic_t num_writes;
 944                         atomic_t num_reads;
 945                         atomic_t num_flushes;
 946                         atomic_t num_oplock_brks;
 947                         atomic_t num_opens;
 948                         atomic_t num_closes;
 949                         atomic_t num_deletes;
 950                         atomic_t num_mkdirs;
 951                         atomic_t num_posixopens;
 952                         atomic_t num_posixmkdirs;
 953                         atomic_t num_rmdirs;
 954                         atomic_t num_renames;
 955                         atomic_t num_t2renames;
 956                         atomic_t num_ffirst;
 957                         atomic_t num_fnext;
 958                         atomic_t num_fclose;
 959                         atomic_t num_hardlinks;
 960                         atomic_t num_symlinks;
 961                         atomic_t num_locks;
 962                         atomic_t num_acl_get;
 963                         atomic_t num_acl_set;
 964                 } cifs_stats;
 965                 struct {
 966                         atomic_t smb2_com_sent[NUMBER_OF_SMB2_COMMANDS];
 967                         atomic_t smb2_com_failed[NUMBER_OF_SMB2_COMMANDS];
 968                 } smb2_stats;
 969         } stats;
 970 #ifdef CONFIG_CIFS_STATS2
 971         unsigned long long time_writes;
 972         unsigned long long time_reads;
 973         unsigned long long time_opens;
 974         unsigned long long time_deletes;
 975         unsigned long long time_closes;
 976         unsigned long long time_mkdirs;
 977         unsigned long long time_rmdirs;
 978         unsigned long long time_renames;
 979         unsigned long long time_t2renames;
 980         unsigned long long time_ffirst;
 981         unsigned long long time_fnext;
 982         unsigned long long time_fclose;
 983 #endif /* CONFIG_CIFS_STATS2 */
 984         __u64    bytes_read;
 985         __u64    bytes_written;
 986         spinlock_t stat_lock;  /* protects the two fields above */
 987 #endif /* CONFIG_CIFS_STATS */
 988         FILE_SYSTEM_DEVICE_INFO fsDevInfo;
 989         FILE_SYSTEM_ATTRIBUTE_INFO fsAttrInfo; /* ok if fs name truncated */
 990         FILE_SYSTEM_UNIX_INFO fsUnixInfo;
 991         bool ipc:1;   /* set if connection to IPC$ share (always also pipe) */
 992         bool pipe:1;  /* set if connection to pipe share */
 993         bool print:1; /* set if connection to printer share */
 994         bool retry:1;
 995         bool nocase:1;
 996         bool nohandlecache:1; /* if strange server resource prob can turn off */
 997         bool seal:1;      /* transport encryption for this mounted share */
 998         bool unix_ext:1;  /* if false disable Linux extensions to CIFS protocol
 999                                 for this mount even if server would support */
1000 #ifdef CONFIG_CIFS_SMB311
1001         bool posix_extensions; /* if true SMB3.11 posix extensions enabled */
1002 #endif /* CIFS_311 */
1003         bool local_lease:1; /* check leases (only) on local system not remote */
1004         bool broken_posix_open; /* e.g. Samba server versions < 3.3.2, 3.2.9 */
1005         bool broken_sparse_sup; /* if server or share does not support sparse */
1006         bool need_reconnect:1; /* connection reset, tid now invalid */
1007         bool need_reopen_files:1; /* need to reopen tcon file handles */
1008         bool use_resilient:1; /* use resilient instead of durable handles */
1009         bool use_persistent:1; /* use persistent instead of durable handles */
1010         __le32 capabilities;
1011         __u32 share_flags;
1012         __u32 maximal_access;
1013         __u32 vol_serial_number;
1014         __le64 vol_create_time;
1015         __u64 snapshot_time; /* for timewarp tokens - timestamp of snapshot */
1016         __u32 ss_flags;         /* sector size flags */
1017         __u32 perf_sector_size; /* best sector size for perf */
1018         __u32 max_chunks;
1019         __u32 max_bytes_chunk;
1020         __u32 max_bytes_copy;
1021 #ifdef CONFIG_CIFS_FSCACHE
1022         u64 resource_id;                /* server resource id */
1023         struct fscache_cookie *fscache; /* cookie for share */
1024 #endif
1025         struct list_head pending_opens; /* list of incomplete opens */
1026         struct cached_fid crfid; /* Cached root fid */
1027         /* BB add field for back pointer to sb struct(s)? */
1028 };
1029
1030 /*
1031  * This is a refcounted and timestamped container for a tcon pointer. The
1032  * container holds a tcon reference. It is considered safe to free one of
1033  * these when the tl_count goes to 0. The tl_time is the time of the last
1034  * "get" on the container.
1035  */
1036 struct tcon_link {
1037         struct rb_node          tl_rbnode;
1038         kuid_t                  tl_uid;
1039         unsigned long           tl_flags;
1040 #define TCON_LINK_MASTER        0
1041 #define TCON_LINK_PENDING       1
1042 #define TCON_LINK_IN_TREE       2
1043         unsigned long           tl_time;
1044         atomic_t                tl_count;
1045         struct cifs_tcon        *tl_tcon;
1046 };
1047
1048 extern struct tcon_link *cifs_sb_tlink(struct cifs_sb_info *cifs_sb);
1049
1050 static inline struct cifs_tcon *
1051 tlink_tcon(struct tcon_link *tlink)
1052 {
1053         return tlink->tl_tcon;
1054 }
1055
1056 static inline struct tcon_link *
1057 cifs_sb_master_tlink(struct cifs_sb_info *cifs_sb)
1058 {
1059         return cifs_sb->master_tlink;
1060 }
1061
1062 extern void cifs_put_tlink(struct tcon_link *tlink);
1063
1064 static inline struct tcon_link *
1065 cifs_get_tlink(struct tcon_link *tlink)
1066 {
1067         if (tlink && !IS_ERR(tlink))
1068                 atomic_inc(&tlink->tl_count);
1069         return tlink;
1070 }
1071
1072 /* This function is always expected to succeed */
1073 extern struct cifs_tcon *cifs_sb_master_tcon(struct cifs_sb_info *cifs_sb);
1074
1075 #define CIFS_OPLOCK_NO_CHANGE 0xfe
1076
1077 struct cifs_pending_open {
1078         struct list_head olist;
1079         struct tcon_link *tlink;
1080         __u8 lease_key[16];
1081         __u32 oplock;
1082 };
1083
1084 /*
1085  * This info hangs off the cifsFileInfo structure, pointed to by llist.
1086  * This is used to track byte stream locks on the file
1087  */
1088 struct cifsLockInfo {
1089         struct list_head llist; /* pointer to next cifsLockInfo */
1090         struct list_head blist; /* pointer to locks blocked on this */
1091         wait_queue_head_t block_q;
1092         __u64 offset;
1093         __u64 length;
1094         __u32 pid;
1095         __u32 type;
1096 };
1097
1098 /*
1099  * One of these for each open instance of a file
1100  */
1101 struct cifs_search_info {
1102         loff_t index_of_last_entry;
1103         __u16 entries_in_buffer;
1104         __u16 info_level;
1105         __u32 resume_key;
1106         char *ntwrk_buf_start;
1107         char *srch_entries_start;
1108         char *last_entry;
1109         const char *presume_name;
1110         unsigned int resume_name_len;
1111         bool endOfSearch:1;
1112         bool emptyDir:1;
1113         bool unicode:1;
1114         bool smallBuf:1; /* so we know which buf_release function to call */
1115 };
1116
1117 struct cifs_open_parms {
1118         struct cifs_tcon *tcon;
1119         struct cifs_sb_info *cifs_sb;
1120         int disposition;
1121         int desired_access;
1122         int create_options;
1123         const char *path;
1124         struct cifs_fid *fid;
1125         umode_t mode;
1126         bool reconnect:1;
1127 };
1128
1129 struct cifs_fid {
1130         __u16 netfid;
1131         __u64 persistent_fid;   /* persist file id for smb2 */
1132         __u64 volatile_fid;     /* volatile file id for smb2 */
1133         __u8 lease_key[SMB2_LEASE_KEY_SIZE];    /* lease key for smb2 */
1134         __u8 create_guid[16];
1135         struct cifs_pending_open *pending_open;
1136         unsigned int epoch;
1137         bool purge_cache;
1138 };
1139
1140 struct cifs_fid_locks {
1141         struct list_head llist;
1142         struct cifsFileInfo *cfile;     /* fid that owns locks */
1143         struct list_head locks;         /* locks held by fid above */
1144 };
1145
1146 struct cifsFileInfo {
1147         /* following two lists are protected by tcon->open_file_lock */
1148         struct list_head tlist; /* pointer to next fid owned by tcon */
1149         struct list_head flist; /* next fid (file instance) for this inode */
1150         /* lock list below protected by cifsi->lock_sem */
1151         struct cifs_fid_locks *llist;   /* brlocks held by this fid */
1152         kuid_t uid;             /* allows finding which FileInfo structure */
1153         __u32 pid;              /* process id who opened file */
1154         struct cifs_fid fid;    /* file id from remote */
1155         struct list_head rlist; /* reconnect list */
1156         /* BB add lock scope info here if needed */ ;
1157         /* lock scope id (0 if none) */
1158         struct dentry *dentry;
1159         struct tcon_link *tlink;
1160         unsigned int f_flags;
1161         bool invalidHandle:1;   /* file closed via session abend */
1162         bool oplock_break_cancelled:1;
1163         int count;
1164         spinlock_t file_info_lock; /* protects four flag/count fields above */
1165         struct mutex fh_mutex; /* prevents reopen race after dead ses*/
1166         struct cifs_search_info srch_inf;
1167         struct work_struct oplock_break; /* work for oplock breaks */
1168 };
1169
1170 struct cifs_io_parms {
1171         __u16 netfid;
1172         __u64 persistent_fid;   /* persist file id for smb2 */
1173         __u64 volatile_fid;     /* volatile file id for smb2 */
1174         __u32 pid;
1175         __u64 offset;
1176         unsigned int length;
1177         struct cifs_tcon *tcon;
1178 };
1179
1180 struct cifs_aio_ctx {
1181         struct kref             refcount;
1182         struct list_head        list;
1183         struct mutex            aio_mutex;
1184         struct completion       done;
1185         struct iov_iter         iter;
1186         struct kiocb            *iocb;
1187         struct cifsFileInfo     *cfile;
1188         struct bio_vec          *bv;
1189         loff_t                  pos;
1190         unsigned int            npages;
1191         ssize_t                 rc;
1192         unsigned int            len;
1193         unsigned int            total_len;
1194         bool                    should_dirty;
1195 };
1196
1197 struct cifs_readdata;
1198
1199 /* asynchronous read support */
1200 struct cifs_readdata {
1201         struct kref                     refcount;
1202         struct list_head                list;
1203         struct completion               done;
1204         struct cifsFileInfo             *cfile;
1205         struct address_space            *mapping;
1206         struct cifs_aio_ctx             *ctx;
1207         __u64                           offset;
1208         unsigned int                    bytes;
1209         unsigned int                    got_bytes;
1210         pid_t                           pid;
1211         int                             result;
1212         struct work_struct              work;
1213         int (*read_into_pages)(struct TCP_Server_Info *server,
1214                                 struct cifs_readdata *rdata,
1215                                 unsigned int len);
1216         int (*copy_into_pages)(struct TCP_Server_Info *server,
1217                                 struct cifs_readdata *rdata,
1218                                 struct iov_iter *iter);
1219         struct kvec                     iov[2];
1220 #ifdef CONFIG_CIFS_SMB_DIRECT
1221         struct smbd_mr                  *mr;
1222 #endif
1223         unsigned int                    pagesz;
1224         unsigned int                    page_offset;
1225         unsigned int                    tailsz;
1226         unsigned int                    credits;
1227         unsigned int                    nr_pages;
1228         struct page                     **pages;
1229 };
1230
1231 struct cifs_writedata;
1232
1233 /* asynchronous write support */
1234 struct cifs_writedata {
1235         struct kref                     refcount;
1236         struct list_head                list;
1237         struct completion               done;
1238         enum writeback_sync_modes       sync_mode;
1239         struct work_struct              work;
1240         struct cifsFileInfo             *cfile;
1241         struct cifs_aio_ctx             *ctx;
1242         __u64                           offset;
1243         pid_t                           pid;
1244         unsigned int                    bytes;
1245         int                             result;
1246 #ifdef CONFIG_CIFS_SMB_DIRECT
1247         struct smbd_mr                  *mr;
1248 #endif
1249         unsigned int                    pagesz;
1250         unsigned int                    page_offset;
1251         unsigned int                    tailsz;
1252         unsigned int                    credits;
1253         unsigned int                    nr_pages;
1254         struct page                     **pages;
1255 };
1256
1257 /*
1258  * Take a reference on the file private data. Must be called with
1259  * cfile->file_info_lock held.
1260  */
1261 static inline void
1262 cifsFileInfo_get_locked(struct cifsFileInfo *cifs_file)
1263 {
1264         ++cifs_file->count;
1265 }
1266
1267 struct cifsFileInfo *cifsFileInfo_get(struct cifsFileInfo *cifs_file);
1268 void cifsFileInfo_put(struct cifsFileInfo *cifs_file);
1269
1270 #define CIFS_CACHE_READ_FLG     1
1271 #define CIFS_CACHE_HANDLE_FLG   2
1272 #define CIFS_CACHE_RH_FLG       (CIFS_CACHE_READ_FLG | CIFS_CACHE_HANDLE_FLG)
1273 #define CIFS_CACHE_WRITE_FLG    4
1274 #define CIFS_CACHE_RW_FLG       (CIFS_CACHE_READ_FLG | CIFS_CACHE_WRITE_FLG)
1275 #define CIFS_CACHE_RHW_FLG      (CIFS_CACHE_RW_FLG | CIFS_CACHE_HANDLE_FLG)
1276
1277 #define CIFS_CACHE_READ(cinode) (cinode->oplock & CIFS_CACHE_READ_FLG)
1278 #define CIFS_CACHE_HANDLE(cinode) (cinode->oplock & CIFS_CACHE_HANDLE_FLG)
1279 #define CIFS_CACHE_WRITE(cinode) (cinode->oplock & CIFS_CACHE_WRITE_FLG)
1280
1281 /*
1282  * One of these for each file inode
1283  */
1284
1285 struct cifsInodeInfo {
1286         bool can_cache_brlcks;
1287         struct list_head llist; /* locks helb by this inode */
1288         struct rw_semaphore lock_sem;   /* protect the fields above */
1289         /* BB add in lists for dirty pages i.e. write caching info for oplock */
1290         struct list_head openFileList;
1291         __u32 cifsAttrs; /* e.g. DOS archive bit, sparse, compressed, system */
1292         unsigned int oplock;            /* oplock/lease level we have */
1293         unsigned int epoch;             /* used to track lease state changes */
1294 #define CIFS_INODE_PENDING_OPLOCK_BREAK   (0) /* oplock break in progress */
1295 #define CIFS_INODE_PENDING_WRITERS        (1) /* Writes in progress */
1296 #define CIFS_INODE_DOWNGRADE_OPLOCK_TO_L2 (2) /* Downgrade oplock to L2 */
1297 #define CIFS_INO_DELETE_PENDING           (3) /* delete pending on server */
1298 #define CIFS_INO_INVALID_MAPPING          (4) /* pagecache is invalid */
1299 #define CIFS_INO_LOCK                     (5) /* lock bit for synchronization */
1300         unsigned long flags;
1301         spinlock_t writers_lock;
1302         unsigned int writers;           /* Number of writers on this inode */
1303         unsigned long time;             /* jiffies of last update of inode */
1304         u64  server_eof;                /* current file size on server -- protected by i_lock */
1305         u64  uniqueid;                  /* server inode number */
1306         u64  createtime;                /* creation time on server */
1307         __u8 lease_key[SMB2_LEASE_KEY_SIZE];    /* lease key for this inode */
1308 #ifdef CONFIG_CIFS_FSCACHE
1309         struct fscache_cookie *fscache;
1310 #endif
1311         struct inode vfs_inode;
1312 };
1313
1314 static inline struct cifsInodeInfo *
1315 CIFS_I(struct inode *inode)
1316 {
1317         return container_of(inode, struct cifsInodeInfo, vfs_inode);
1318 }
1319
1320 static inline struct cifs_sb_info *
1321 CIFS_SB(struct super_block *sb)
1322 {
1323         return sb->s_fs_info;
1324 }
1325
1326 static inline struct cifs_sb_info *
1327 CIFS_FILE_SB(struct file *file)
1328 {
1329         return CIFS_SB(file_inode(file)->i_sb);
1330 }
1331
1332 static inline char CIFS_DIR_SEP(const struct cifs_sb_info *cifs_sb)
1333 {
1334         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_POSIX_PATHS)
1335                 return '/';
1336         else
1337                 return '\\';
1338 }
1339
1340 static inline void
1341 convert_delimiter(char *path, char delim)
1342 {
1343         char old_delim, *pos;
1344
1345         if (delim == '/')
1346                 old_delim = '\\';
1347         else
1348                 old_delim = '/';
1349
1350         pos = path;
1351         while ((pos = strchr(pos, old_delim)))
1352                 *pos = delim;
1353 }
1354
1355 #ifdef CONFIG_CIFS_STATS
1356 #define cifs_stats_inc atomic_inc
1357
1358 static inline void cifs_stats_bytes_written(struct cifs_tcon *tcon,
1359                                             unsigned int bytes)
1360 {
1361         if (bytes) {
1362                 spin_lock(&tcon->stat_lock);
1363                 tcon->bytes_written += bytes;
1364                 spin_unlock(&tcon->stat_lock);
1365         }
1366 }
1367
1368 static inline void cifs_stats_bytes_read(struct cifs_tcon *tcon,
1369                                          unsigned int bytes)
1370 {
1371         spin_lock(&tcon->stat_lock);
1372         tcon->bytes_read += bytes;
1373         spin_unlock(&tcon->stat_lock);
1374 }
1375 #else
1376
1377 #define  cifs_stats_inc(field) do {} while (0)
1378 #define  cifs_stats_bytes_written(tcon, bytes) do {} while (0)
1379 #define  cifs_stats_bytes_read(tcon, bytes) do {} while (0)
1380
1381 #endif
1382
1383
1384 /*
1385  * This is the prototype for the mid receive function. This function is for
1386  * receiving the rest of the SMB frame, starting with the WordCount (which is
1387  * just after the MID in struct smb_hdr). Note:
1388  *
1389  * - This will be called by cifsd, with no locks held.
1390  * - The mid will still be on the pending_mid_q.
1391  * - mid->resp_buf will point to the current buffer.
1392  *
1393  * Returns zero on a successful receive, or an error. The receive state in
1394  * the TCP_Server_Info will also be updated.
1395  */
1396 typedef int (mid_receive_t)(struct TCP_Server_Info *server,
1397                             struct mid_q_entry *mid);
1398
1399 /*
1400  * This is the prototype for the mid callback function. This is called once the
1401  * mid has been received off of the socket. When creating one, take special
1402  * care to avoid deadlocks. Things to bear in mind:
1403  *
1404  * - it will be called by cifsd, with no locks held
1405  * - the mid will be removed from any lists
1406  */
1407 typedef void (mid_callback_t)(struct mid_q_entry *mid);
1408
1409 /*
1410  * This is the protopyte for mid handle function. This is called once the mid
1411  * has been recognized after decryption of the message.
1412  */
1413 typedef int (mid_handle_t)(struct TCP_Server_Info *server,
1414                             struct mid_q_entry *mid);
1415
1416 /* one of these for every pending CIFS request to the server */
1417 struct mid_q_entry {
1418         struct list_head qhead; /* mids waiting on reply from this server */
1419         struct TCP_Server_Info *server; /* server corresponding to this mid */
1420         __u64 mid;              /* multiplex id */
1421         __u32 pid;              /* process id */
1422         __u32 sequence_number;  /* for CIFS signing */
1423         unsigned long when_alloc;  /* when mid was created */
1424 #ifdef CONFIG_CIFS_STATS2
1425         unsigned long when_sent; /* time when smb send finished */
1426         unsigned long when_received; /* when demux complete (taken off wire) */
1427 #endif
1428         mid_receive_t *receive; /* call receive callback */
1429         mid_callback_t *callback; /* call completion callback */
1430         mid_handle_t *handle; /* call handle mid callback */
1431         void *callback_data;      /* general purpose pointer for callback */
1432         void *resp_buf;         /* pointer to received SMB header */
1433         unsigned int resp_buf_size;
1434         int mid_state;  /* wish this were enum but can not pass to wait_event */
1435         unsigned int mid_flags;
1436         __le16 command;         /* smb command code */
1437         bool large_buf:1;       /* if valid response, is pointer to large buf */
1438         bool multiRsp:1;        /* multiple trans2 responses for one request  */
1439         bool multiEnd:1;        /* both received */
1440         bool decrypted:1;       /* decrypted entry */
1441 };
1442
1443 struct close_cancelled_open {
1444         struct cifs_fid         fid;
1445         struct cifs_tcon        *tcon;
1446         struct work_struct      work;
1447 };
1448
1449 /*      Make code in transport.c a little cleaner by moving
1450         update of optional stats into function below */
1451 #ifdef CONFIG_CIFS_STATS2
1452
1453 static inline void cifs_in_send_inc(struct TCP_Server_Info *server)
1454 {
1455         atomic_inc(&server->in_send);
1456 }
1457
1458 static inline void cifs_in_send_dec(struct TCP_Server_Info *server)
1459 {
1460         atomic_dec(&server->in_send);
1461 }
1462
1463 static inline void cifs_num_waiters_inc(struct TCP_Server_Info *server)
1464 {
1465         atomic_inc(&server->num_waiters);
1466 }
1467
1468 static inline void cifs_num_waiters_dec(struct TCP_Server_Info *server)
1469 {
1470         atomic_dec(&server->num_waiters);
1471 }
1472
1473 static inline void cifs_save_when_sent(struct mid_q_entry *mid)
1474 {
1475         mid->when_sent = jiffies;
1476 }
1477 #else
1478 static inline void cifs_in_send_inc(struct TCP_Server_Info *server)
1479 {
1480 }
1481 static inline void cifs_in_send_dec(struct TCP_Server_Info *server)
1482 {
1483 }
1484
1485 static inline void cifs_num_waiters_inc(struct TCP_Server_Info *server)
1486 {
1487 }
1488
1489 static inline void cifs_num_waiters_dec(struct TCP_Server_Info *server)
1490 {
1491 }
1492
1493 static inline void cifs_save_when_sent(struct mid_q_entry *mid)
1494 {
1495 }
1496 #endif
1497
1498 /* for pending dnotify requests */
1499 struct dir_notify_req {
1500         struct list_head lhead;
1501         __le16 Pid;
1502         __le16 PidHigh;
1503         __u16 Mid;
1504         __u16 Tid;
1505         __u16 Uid;
1506         __u16 netfid;
1507         __u32 filter; /* CompletionFilter (for multishot) */
1508         int multishot;
1509         struct file *pfile;
1510 };
1511
1512 struct dfs_info3_param {
1513         int flags; /* DFSREF_REFERRAL_SERVER, DFSREF_STORAGE_SERVER*/
1514         int path_consumed;
1515         int server_type;
1516         int ref_flag;
1517         char *path_name;
1518         char *node_name;
1519 };
1520
1521 /*
1522  * common struct for holding inode info when searching for or updating an
1523  * inode with new info
1524  */
1525
1526 #define CIFS_FATTR_DFS_REFERRAL         0x1
1527 #define CIFS_FATTR_DELETE_PENDING       0x2
1528 #define CIFS_FATTR_NEED_REVAL           0x4
1529 #define CIFS_FATTR_INO_COLLISION        0x8
1530 #define CIFS_FATTR_UNKNOWN_NLINK        0x10
1531 #define CIFS_FATTR_FAKE_ROOT_INO        0x20
1532
1533 struct cifs_fattr {
1534         u32             cf_flags;
1535         u32             cf_cifsattrs;
1536         u64             cf_uniqueid;
1537         u64             cf_eof;
1538         u64             cf_bytes;
1539         u64             cf_createtime;
1540         kuid_t          cf_uid;
1541         kgid_t          cf_gid;
1542         umode_t         cf_mode;
1543         dev_t           cf_rdev;
1544         unsigned int    cf_nlink;
1545         unsigned int    cf_dtype;
1546         struct timespec cf_atime;
1547         struct timespec cf_mtime;
1548         struct timespec cf_ctime;
1549 };
1550
1551 static inline void free_dfs_info_param(struct dfs_info3_param *param)
1552 {
1553         if (param) {
1554                 kfree(param->path_name);
1555                 kfree(param->node_name);
1556                 kfree(param);
1557         }
1558 }
1559
1560 static inline void free_dfs_info_array(struct dfs_info3_param *param,
1561                                        int number_of_items)
1562 {
1563         int i;
1564         if ((number_of_items == 0) || (param == NULL))
1565                 return;
1566         for (i = 0; i < number_of_items; i++) {
1567                 kfree(param[i].path_name);
1568                 kfree(param[i].node_name);
1569         }
1570         kfree(param);
1571 }
1572
1573 #define   MID_FREE 0
1574 #define   MID_REQUEST_ALLOCATED 1
1575 #define   MID_REQUEST_SUBMITTED 2
1576 #define   MID_RESPONSE_RECEIVED 4
1577 #define   MID_RETRY_NEEDED      8 /* session closed while this request out */
1578 #define   MID_RESPONSE_MALFORMED 0x10
1579 #define   MID_SHUTDOWN           0x20
1580
1581 /* Flags */
1582 #define   MID_WAIT_CANCELLED     1 /* Cancelled while waiting for response */
1583
1584 /* Types of response buffer returned from SendReceive2 */
1585 #define   CIFS_NO_BUFFER        0    /* Response buffer not returned */
1586 #define   CIFS_SMALL_BUFFER     1
1587 #define   CIFS_LARGE_BUFFER     2
1588 #define   CIFS_IOVEC            4    /* array of response buffers */
1589
1590 /* Type of Request to SendReceive2 */
1591 #define   CIFS_BLOCKING_OP      1    /* operation can block */
1592 #define   CIFS_ASYNC_OP         2    /* do not wait for response */
1593 #define   CIFS_TIMEOUT_MASK 0x003    /* only one of above set in req */
1594 #define   CIFS_LOG_ERROR    0x010    /* log NT STATUS if non-zero */
1595 #define   CIFS_LARGE_BUF_OP 0x020    /* large request buffer */
1596 #define   CIFS_NO_RESP      0x040    /* no response buffer required */
1597
1598 /* Type of request operation */
1599 #define   CIFS_ECHO_OP      0x080    /* echo request */
1600 #define   CIFS_OBREAK_OP   0x0100    /* oplock break request */
1601 #define   CIFS_NEG_OP      0x0200    /* negotiate request */
1602 #define   CIFS_OP_MASK     0x0380    /* mask request type */
1603
1604 #define   CIFS_HAS_CREDITS 0x0400    /* already has credits */
1605 #define   CIFS_TRANSFORM_REQ 0x0800    /* transform request before sending */
1606
1607 /* Security Flags: indicate type of session setup needed */
1608 #define   CIFSSEC_MAY_SIGN      0x00001
1609 #define   CIFSSEC_MAY_NTLM      0x00002
1610 #define   CIFSSEC_MAY_NTLMV2    0x00004
1611 #define   CIFSSEC_MAY_KRB5      0x00008
1612 #ifdef CONFIG_CIFS_WEAK_PW_HASH
1613 #define   CIFSSEC_MAY_LANMAN    0x00010
1614 #define   CIFSSEC_MAY_PLNTXT    0x00020
1615 #else
1616 #define   CIFSSEC_MAY_LANMAN    0
1617 #define   CIFSSEC_MAY_PLNTXT    0
1618 #endif /* weak passwords */
1619 #define   CIFSSEC_MAY_SEAL      0x00040 /* not supported yet */
1620 #define   CIFSSEC_MAY_NTLMSSP   0x00080 /* raw ntlmssp with ntlmv2 */
1621
1622 #define   CIFSSEC_MUST_SIGN     0x01001
1623 /* note that only one of the following can be set so the
1624 result of setting MUST flags more than once will be to
1625 require use of the stronger protocol */
1626 #define   CIFSSEC_MUST_NTLM     0x02002
1627 #define   CIFSSEC_MUST_NTLMV2   0x04004
1628 #define   CIFSSEC_MUST_KRB5     0x08008
1629 #ifdef CONFIG_CIFS_WEAK_PW_HASH
1630 #define   CIFSSEC_MUST_LANMAN   0x10010
1631 #define   CIFSSEC_MUST_PLNTXT   0x20020
1632 #ifdef CONFIG_CIFS_UPCALL
1633 #define   CIFSSEC_MASK          0xBF0BF /* allows weak security but also krb5 */
1634 #else
1635 #define   CIFSSEC_MASK          0xB70B7 /* current flags supported if weak */
1636 #endif /* UPCALL */
1637 #else /* do not allow weak pw hash */
1638 #define   CIFSSEC_MUST_LANMAN   0
1639 #define   CIFSSEC_MUST_PLNTXT   0
1640 #ifdef CONFIG_CIFS_UPCALL
1641 #define   CIFSSEC_MASK          0x8F08F /* flags supported if no weak allowed */
1642 #else
1643 #define   CIFSSEC_MASK          0x87087 /* flags supported if no weak allowed */
1644 #endif /* UPCALL */
1645 #endif /* WEAK_PW_HASH */
1646 #define   CIFSSEC_MUST_SEAL     0x40040 /* not supported yet */
1647 #define   CIFSSEC_MUST_NTLMSSP  0x80080 /* raw ntlmssp with ntlmv2 */
1648
1649 #define   CIFSSEC_DEF (CIFSSEC_MAY_SIGN | CIFSSEC_MAY_NTLMV2 | CIFSSEC_MAY_NTLMSSP)
1650 #define   CIFSSEC_MAX (CIFSSEC_MUST_SIGN | CIFSSEC_MUST_NTLMV2)
1651 #define   CIFSSEC_AUTH_MASK (CIFSSEC_MAY_NTLM | CIFSSEC_MAY_NTLMV2 | CIFSSEC_MAY_LANMAN | CIFSSEC_MAY_PLNTXT | CIFSSEC_MAY_KRB5 | CIFSSEC_MAY_NTLMSSP)
1652 /*
1653  *****************************************************************
1654  * All constants go here
1655  *****************************************************************
1656  */
1657
1658 #define UID_HASH (16)
1659
1660 /*
1661  * Note that ONE module should define _DECLARE_GLOBALS_HERE to cause the
1662  * following to be declared.
1663  */
1664
1665 /****************************************************************************
1666  *  Locking notes.  All updates to global variables and lists should be
1667  *                  protected by spinlocks or semaphores.
1668  *
1669  *  Spinlocks
1670  *  ---------
1671  *  GlobalMid_Lock protects:
1672  *      list operations on pending_mid_q and oplockQ
1673  *      updates to XID counters, multiplex id  and SMB sequence numbers
1674  *  tcp_ses_lock protects:
1675  *      list operations on tcp and SMB session lists
1676  *  tcon->open_file_lock protects the list of open files hanging off the tcon
1677  *  cfile->file_info_lock protects counters and fields in cifs file struct
1678  *  f_owner.lock protects certain per file struct operations
1679  *  mapping->page_lock protects certain per page operations
1680  *
1681  *  Semaphores
1682  *  ----------
1683  *  sesSem     operations on smb session
1684  *  tconSem    operations on tree connection
1685  *  fh_sem      file handle reconnection operations
1686  *
1687  ****************************************************************************/
1688
1689 #ifdef DECLARE_GLOBALS_HERE
1690 #define GLOBAL_EXTERN
1691 #else
1692 #define GLOBAL_EXTERN extern
1693 #endif
1694
1695 /*
1696  * the list of TCP_Server_Info structures, ie each of the sockets
1697  * connecting our client to a distinct server (ip address), is
1698  * chained together by cifs_tcp_ses_list. The list of all our SMB
1699  * sessions (and from that the tree connections) can be found
1700  * by iterating over cifs_tcp_ses_list
1701  */
1702 GLOBAL_EXTERN struct list_head          cifs_tcp_ses_list;
1703
1704 /*
1705  * This lock protects the cifs_tcp_ses_list, the list of smb sessions per
1706  * tcp session, and the list of tcon's per smb session. It also protects
1707  * the reference counters for the server, smb session, and tcon. Finally,
1708  * changes to the tcon->tidStatus should be done while holding this lock.
1709  * generally the locks should be taken in order tcp_ses_lock before
1710  * tcon->open_file_lock and that before file->file_info_lock since the
1711  * structure order is cifs_socket-->cifs_ses-->cifs_tcon-->cifs_file
1712  */
1713 GLOBAL_EXTERN spinlock_t                cifs_tcp_ses_lock;
1714
1715 #ifdef CONFIG_CIFS_DNOTIFY_EXPERIMENTAL /* unused temporarily */
1716 /* Outstanding dir notify requests */
1717 GLOBAL_EXTERN struct list_head GlobalDnotifyReqList;
1718 /* DirNotify response queue */
1719 GLOBAL_EXTERN struct list_head GlobalDnotifyRsp_Q;
1720 #endif /* was needed for dnotify, and will be needed for inotify when VFS fix */
1721
1722 /*
1723  * Global transaction id (XID) information
1724  */
1725 GLOBAL_EXTERN unsigned int GlobalCurrentXid;    /* protected by GlobalMid_Sem */
1726 GLOBAL_EXTERN unsigned int GlobalTotalActiveXid; /* prot by GlobalMid_Sem */
1727 GLOBAL_EXTERN unsigned int GlobalMaxActiveXid;  /* prot by GlobalMid_Sem */
1728 GLOBAL_EXTERN spinlock_t GlobalMid_Lock;  /* protects above & list operations */
1729                                           /* on midQ entries */
1730 /*
1731  *  Global counters, updated atomically
1732  */
1733 GLOBAL_EXTERN atomic_t sesInfoAllocCount;
1734 GLOBAL_EXTERN atomic_t tconInfoAllocCount;
1735 GLOBAL_EXTERN atomic_t tcpSesAllocCount;
1736 GLOBAL_EXTERN atomic_t tcpSesReconnectCount;
1737 GLOBAL_EXTERN atomic_t tconInfoReconnectCount;
1738
1739 /* Various Debug counters */
1740 GLOBAL_EXTERN atomic_t bufAllocCount;    /* current number allocated  */
1741 #ifdef CONFIG_CIFS_STATS2
1742 GLOBAL_EXTERN atomic_t totBufAllocCount; /* total allocated over all time */
1743 GLOBAL_EXTERN atomic_t totSmBufAllocCount;
1744 #endif
1745 GLOBAL_EXTERN atomic_t smBufAllocCount;
1746 GLOBAL_EXTERN atomic_t midCount;
1747
1748 /* Misc globals */
1749 extern bool enable_oplocks; /* enable or disable oplocks */
1750 extern bool lookupCacheEnabled;
1751 extern unsigned int global_secflags;    /* if on, session setup sent
1752                                 with more secure ntlmssp2 challenge/resp */
1753 extern unsigned int sign_CIFS_PDUs;  /* enable smb packet signing */
1754 extern bool linuxExtEnabled;/*enable Linux/Unix CIFS extensions*/
1755 extern unsigned int CIFSMaxBufSize;  /* max size not including hdr */
1756 extern unsigned int cifs_min_rcv;    /* min size of big ntwrk buf pool */
1757 extern unsigned int cifs_min_small;  /* min size of small buf pool */
1758 extern unsigned int cifs_max_pending; /* MAX requests at once to server*/
1759 extern bool disable_legacy_dialects;  /* forbid vers=1.0 and vers=2.0 mounts */
1760
1761 #ifdef CONFIG_CIFS_ACL
1762 GLOBAL_EXTERN struct rb_root uidtree;
1763 GLOBAL_EXTERN struct rb_root gidtree;
1764 GLOBAL_EXTERN spinlock_t siduidlock;
1765 GLOBAL_EXTERN spinlock_t sidgidlock;
1766 GLOBAL_EXTERN struct rb_root siduidtree;
1767 GLOBAL_EXTERN struct rb_root sidgidtree;
1768 GLOBAL_EXTERN spinlock_t uidsidlock;
1769 GLOBAL_EXTERN spinlock_t gidsidlock;
1770 #endif /* CONFIG_CIFS_ACL */
1771
1772 void cifs_oplock_break(struct work_struct *work);
1773
1774 extern const struct slow_work_ops cifs_oplock_break_ops;
1775 extern struct workqueue_struct *cifsiod_wq;
1776 extern struct workqueue_struct *cifsoplockd_wq;
1777 extern __u32 cifs_lock_secret;
1778
1779 extern mempool_t *cifs_mid_poolp;
1780
1781 /* Operations for different SMB versions */
1782 #define SMB1_VERSION_STRING     "1.0"
1783 extern struct smb_version_operations smb1_operations;
1784 extern struct smb_version_values smb1_values;
1785 #define SMB20_VERSION_STRING    "2.0"
1786 extern struct smb_version_operations smb20_operations;
1787 extern struct smb_version_values smb20_values;
1788 #define SMB21_VERSION_STRING    "2.1"
1789 extern struct smb_version_operations smb21_operations;
1790 extern struct smb_version_values smb21_values;
1791 #define SMBDEFAULT_VERSION_STRING "default"
1792 extern struct smb_version_values smbdefault_values;
1793 #define SMB3ANY_VERSION_STRING "3"
1794 extern struct smb_version_values smb3any_values;
1795 #define SMB30_VERSION_STRING    "3.0"
1796 extern struct smb_version_operations smb30_operations;
1797 extern struct smb_version_values smb30_values;
1798 #define SMB302_VERSION_STRING   "3.02"
1799 /*extern struct smb_version_operations smb302_operations;*/ /* not needed yet */
1800 extern struct smb_version_values smb302_values;
1801 #define SMB311_VERSION_STRING   "3.1.1"
1802 #define ALT_SMB311_VERSION_STRING "3.11"
1803 extern struct smb_version_operations smb311_operations;
1804 extern struct smb_version_values smb311_values;
1805 #endif  /* _CIFS_GLOB_H */