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 SMB_PATH_MAX 260
  37 #define CIFS_PORT 445
  38 #define RFC1001_PORT 139
  39
  40 /*
  41  * The sizes of various internal tables and strings
  42  */
  43 #define MAX_UID_INFO 16
  44 #define MAX_SES_INFO 2
  45 #define MAX_TCON_INFO 4
  46
  47 #define MAX_TREE_SIZE (2 + CIFS_NI_MAXHOST + 1 + CIFS_MAX_SHARE_LEN + 1)
  48
  49 #define CIFS_MIN_RCV_POOL 4
  50
  51 #define MAX_REOPEN_ATT  5 /* these many maximum attempts to reopen a file */
  52 /*
  53  * default attribute cache timeout (jiffies)
  54  */
  55 #define CIFS_DEF_ACTIMEO (1 * HZ)
  56
  57 /*
  58  * max attribute cache timeout (jiffies) - 2^30
  59  */
  60 #define CIFS_MAX_ACTIMEO (1 << 30)
  61
  62 /*
  63  * Max persistent and resilient handle timeout (milliseconds).
  64  * Windows durable max was 960000 (16 minutes)
  65  */
  66 #define SMB3_MAX_HANDLE_TIMEOUT 960000
  67
  68 /*
  69  * MAX_REQ is the maximum number of requests that WE will send
  70  * on one socket concurrently.
  71  */
  72 #define CIFS_MAX_REQ 32767
  73
  74 #define RFC1001_NAME_LEN 15
  75 #define RFC1001_NAME_LEN_WITH_NULL (RFC1001_NAME_LEN + 1)
  76
  77 /* maximum length of ip addr as a string (including ipv6 and sctp) */
  78 #define SERVER_NAME_LENGTH 80
  79 #define SERVER_NAME_LEN_WITH_NULL     (SERVER_NAME_LENGTH + 1)
  80
  81 /* echo interval in seconds */
  82 #define SMB_ECHO_INTERVAL_MIN 1
  83 #define SMB_ECHO_INTERVAL_MAX 600
  84 #define SMB_ECHO_INTERVAL_DEFAULT 60
  85
  86 /* maximum number of PDUs in one compound */
  87 #define MAX_COMPOUND 5
  88
  89 /*
  90  * Default number of credits to keep available for SMB3.
  91  * This value is chosen somewhat arbitrarily. The Windows client
  92  * defaults to 128 credits, the Windows server allows clients up to
  93  * 512 credits (or 8K for later versions), and the NetApp server
  94  * does not limit clients at all.  Choose a high enough default value
  95  * such that the client shouldn't limit performance, but allow mount
  96  * to override (until you approach 64K, where we limit credits to 65000
  97  * to reduce possibility of seeing more server credit overflow bugs.
  98  */
  99 #define SMB2_MAX_CREDITS_AVAILABLE 32000
 100
 101 #include "cifspdu.h"
 102
 103 #ifndef XATTR_DOS_ATTRIB
 104 #define XATTR_DOS_ATTRIB "user.DOSATTRIB"
 105 #endif
 106
 107 /*
 108  * CIFS vfs client Status information (based on what we know.)
 109  */
 110
 111 /* associated with each tcp and smb session */
 112 enum statusEnum {
 113         CifsNew = 0,
 114         CifsGood,
 115         CifsExiting,
 116         CifsNeedReconnect,
 117         CifsNeedNegotiate
 118 };
 119
 120 enum securityEnum {
 121         Unspecified = 0,        /* not specified */
 122         LANMAN,                 /* Legacy LANMAN auth */
 123         NTLM,                   /* Legacy NTLM012 auth with NTLM hash */
 124         NTLMv2,                 /* Legacy NTLM auth with NTLMv2 hash */
 125         RawNTLMSSP,             /* NTLMSSP without SPNEGO, NTLMv2 hash */
 126         Kerberos,               /* Kerberos via SPNEGO */
 127 };
 128
 129 struct session_key {
 130         unsigned int len;
 131         char *response;
 132 };
 133
 134 /* crypto security descriptor definition */
 135 struct sdesc {
 136         struct shash_desc shash;
 137         char ctx[];
 138 };
 139
 140 /* crypto hashing related structure/fields, not specific to a sec mech */
 141 struct cifs_secmech {
 142         struct crypto_shash *hmacmd5; /* hmac-md5 hash function */
 143         struct crypto_shash *md5; /* md5 hash function */
 144         struct crypto_shash *hmacsha256; /* hmac-sha256 hash function */
 145         struct crypto_shash *cmacaes; /* block-cipher based MAC function */
 146         struct crypto_shash *sha512; /* sha512 hash function */
 147         struct sdesc *sdeschmacmd5;  /* ctxt to generate ntlmv2 hash, CR1 */
 148         struct sdesc *sdescmd5; /* ctxt to generate cifs/smb signature */
 149         struct sdesc *sdeschmacsha256;  /* ctxt to generate smb2 signature */
 150         struct sdesc *sdesccmacaes;  /* ctxt to generate smb3 signature */
 151         struct sdesc *sdescsha512; /* ctxt to generate smb3.11 signing key */
 152         struct crypto_aead *ccmaesencrypt; /* smb3 encryption aead */
 153         struct crypto_aead *ccmaesdecrypt; /* smb3 decryption aead */
 154 };
 155
 156 /* per smb session structure/fields */
 157 struct ntlmssp_auth {
 158         bool sesskey_per_smbsess; /* whether session key is per smb session */
 159         __u32 client_flags; /* sent by client in type 1 ntlmsssp exchange */
 160         __u32 server_flags; /* sent by server in type 2 ntlmssp exchange */
 161         unsigned char ciphertext[CIFS_CPHTXT_SIZE]; /* sent to server */
 162         char cryptkey[CIFS_CRYPTO_KEY_SIZE]; /* used by ntlmssp */
 163 };
 164
 165 struct cifs_cred {
 166         int uid;
 167         int gid;
 168         int mode;
 169         int cecount;
 170         struct cifs_sid osid;
 171         struct cifs_sid gsid;
 172         struct cifs_ntace *ntaces;
 173         struct cifs_ace *aces;
 174 };
 175
 176 /*
 177  *****************************************************************
 178  * Except the CIFS PDUs themselves all the
 179  * globally interesting structs should go here
 180  *****************************************************************
 181  */
 182
 183 /*
 184  * A smb_rqst represents a complete request to be issued to a server. It's
 185  * formed by a kvec array, followed by an array of pages. Page data is assumed
 186  * to start at the beginning of the first page.
 187  */
 188 struct smb_rqst {
 189         struct kvec     *rq_iov;        /* array of kvecs */
 190         unsigned int    rq_nvec;        /* number of kvecs in array */
 191         struct page     **rq_pages;     /* pointer to array of page ptrs */
 192         unsigned int    rq_offset;      /* the offset to the 1st page */
 193         unsigned int    rq_npages;      /* number pages in array */
 194         unsigned int    rq_pagesz;      /* page size to use */
 195         unsigned int    rq_tailsz;      /* length of last page */
 196 };
 197
 198 enum smb_version {
 199         Smb_1 = 1,
 200         Smb_20,
 201         Smb_21,
 202         Smb_30,
 203         Smb_302,
 204         Smb_311,
 205         Smb_3any,
 206         Smb_default,
 207         Smb_version_err
 208 };
 209
 210 struct mid_q_entry;
 211 struct TCP_Server_Info;
 212 struct cifsFileInfo;
 213 struct cifs_ses;
 214 struct cifs_tcon;
 215 struct dfs_info3_param;
 216 struct cifs_fattr;
 217 struct smb_vol;
 218 struct cifs_fid;
 219 struct cifs_readdata;
 220 struct cifs_writedata;
 221 struct cifs_io_parms;
 222 struct cifs_search_info;
 223 struct cifsInodeInfo;
 224 struct cifs_open_parms;
 225 struct cifs_credits;
 226
 227 struct smb_version_operations {
 228         int (*send_cancel)(struct TCP_Server_Info *, struct smb_rqst *,
 229                            struct mid_q_entry *);
 230         bool (*compare_fids)(struct cifsFileInfo *, struct cifsFileInfo *);
 231         /* setup request: allocate mid, sign message */
 232         struct mid_q_entry *(*setup_request)(struct cifs_ses *,
 233                                              struct TCP_Server_Info *,
 234                                              struct smb_rqst *);
 235         /* setup async request: allocate mid, sign message */
 236         struct mid_q_entry *(*setup_async_request)(struct TCP_Server_Info *,
 237                                                 struct smb_rqst *);
 238         /* check response: verify signature, map error */
 239         int (*check_receive)(struct mid_q_entry *, struct TCP_Server_Info *,
 240                              bool);
 241         void (*add_credits)(struct TCP_Server_Info *server,
 242                             const struct cifs_credits *credits,
 243                             const int optype);
 244         void (*set_credits)(struct TCP_Server_Info *, const int);
 245         int * (*get_credits_field)(struct TCP_Server_Info *, const int);
 246         unsigned int (*get_credits)(struct mid_q_entry *);
 247         __u64 (*get_next_mid)(struct TCP_Server_Info *);
 248         void (*revert_current_mid)(struct TCP_Server_Info *server,
 249                                    const unsigned int val);
 250         /* data offset from read response message */
 251         unsigned int (*read_data_offset)(char *);
 252         /*
 253          * Data length from read response message
 254          * When in_remaining is true, the returned data length is in
 255          * message field DataRemaining for out-of-band data read (e.g through
 256          * Memory Registration RDMA write in SMBD).
 257          * Otherwise, the returned data length is in message field DataLength.
 258          */
 259         unsigned int (*read_data_length)(char *, bool in_remaining);
 260         /* map smb to linux error */
 261         int (*map_error)(char *, bool);
 262         /* find mid corresponding to the response message */
 263         struct mid_q_entry * (*find_mid)(struct TCP_Server_Info *, char *);
 264         void (*dump_detail)(void *buf, struct TCP_Server_Info *ptcp_info);
 265         void (*clear_stats)(struct cifs_tcon *);
 266         void (*print_stats)(struct seq_file *m, struct cifs_tcon *);
 267         void (*dump_share_caps)(struct seq_file *, struct cifs_tcon *);
 268         /* verify the message */
 269         int (*check_message)(char *, unsigned int, struct TCP_Server_Info *);
 270         bool (*is_oplock_break)(char *, struct TCP_Server_Info *);
 271         int (*handle_cancelled_mid)(char *, struct TCP_Server_Info *);
 272         void (*downgrade_oplock)(struct TCP_Server_Info *server,
 273                                  struct cifsInodeInfo *cinode, __u32 oplock,
 274                                  unsigned int epoch, bool *purge_cache);
 275         /* process transaction2 response */
 276         bool (*check_trans2)(struct mid_q_entry *, struct TCP_Server_Info *,
 277                              char *, int);
 278         /* check if we need to negotiate */
 279         bool (*need_neg)(struct TCP_Server_Info *);
 280         /* negotiate to the server */
 281         int (*negotiate)(const unsigned int, struct cifs_ses *);
 282         /* set negotiated write size */
 283         unsigned int (*negotiate_wsize)(struct cifs_tcon *, struct smb_vol *);
 284         /* set negotiated read size */
 285         unsigned int (*negotiate_rsize)(struct cifs_tcon *, struct smb_vol *);
 286         /* setup smb sessionn */
 287         int (*sess_setup)(const unsigned int, struct cifs_ses *,
 288                           const struct nls_table *);
 289         /* close smb session */
 290         int (*logoff)(const unsigned int, struct cifs_ses *);
 291         /* connect to a server share */
 292         int (*tree_connect)(const unsigned int, struct cifs_ses *, const char *,
 293                             struct cifs_tcon *, const struct nls_table *);
 294         /* close tree connecion */
 295         int (*tree_disconnect)(const unsigned int, struct cifs_tcon *);
 296         /* get DFS referrals */
 297         int (*get_dfs_refer)(const unsigned int, struct cifs_ses *,
 298                              const char *, struct dfs_info3_param **,
 299                              unsigned int *, const struct nls_table *, int);
 300         /* informational QFS call */
 301         void (*qfs_tcon)(const unsigned int, struct cifs_tcon *,
 302                          struct cifs_sb_info *);
 303         /* check if a path is accessible or not */
 304         int (*is_path_accessible)(const unsigned int, struct cifs_tcon *,
 305                                   struct cifs_sb_info *, const char *);
 306         /* query path data from the server */
 307         int (*query_path_info)(const unsigned int, struct cifs_tcon *,
 308                                struct cifs_sb_info *, const char *,
 309                                FILE_ALL_INFO *, bool *, bool *);
 310         /* query file data from the server */
 311         int (*query_file_info)(const unsigned int, struct cifs_tcon *,
 312                                struct cifs_fid *, FILE_ALL_INFO *);
 313         /* get server index number */
 314         int (*get_srv_inum)(const unsigned int, struct cifs_tcon *,
 315                             struct cifs_sb_info *, const char *,
 316                             u64 *uniqueid, FILE_ALL_INFO *);
 317         /* set size by path */
 318         int (*set_path_size)(const unsigned int, struct cifs_tcon *,
 319                              const char *, __u64, struct cifs_sb_info *, bool);
 320         /* set size by file handle */
 321         int (*set_file_size)(const unsigned int, struct cifs_tcon *,
 322                              struct cifsFileInfo *, __u64, bool);
 323         /* set attributes */
 324         int (*set_file_info)(struct inode *, const char *, FILE_BASIC_INFO *,
 325                              const unsigned int);
 326         int (*set_compression)(const unsigned int, struct cifs_tcon *,
 327                                struct cifsFileInfo *);
 328         /* check if we can send an echo or nor */
 329         bool (*can_echo)(struct TCP_Server_Info *);
 330         /* send echo request */
 331         int (*echo)(struct TCP_Server_Info *);
 332         /* create directory */
 333         int (*posix_mkdir)(const unsigned int xid, struct inode *inode,
 334                         umode_t mode, struct cifs_tcon *tcon,
 335                         const char *full_path,
 336                         struct cifs_sb_info *cifs_sb);
 337         int (*mkdir)(const unsigned int xid, struct inode *inode, umode_t mode,
 338                      struct cifs_tcon *tcon, const char *name,
 339                      struct cifs_sb_info *sb);
 340         /* set info on created directory */
 341         void (*mkdir_setinfo)(struct inode *, const char *,
 342                               struct cifs_sb_info *, struct cifs_tcon *,
 343                               const unsigned int);
 344         /* remove directory */
 345         int (*rmdir)(const unsigned int, struct cifs_tcon *, const char *,
 346                      struct cifs_sb_info *);
 347         /* unlink file */
 348         int (*unlink)(const unsigned int, struct cifs_tcon *, const char *,
 349                       struct cifs_sb_info *);
 350         /* open, rename and delete file */
 351         int (*rename_pending_delete)(const char *, struct dentry *,
 352                                      const unsigned int);
 353         /* send rename request */
 354         int (*rename)(const unsigned int, struct cifs_tcon *, const char *,
 355                       const char *, struct cifs_sb_info *);
 356         /* send create hardlink request */
 357         int (*create_hardlink)(const unsigned int, struct cifs_tcon *,
 358                                const char *, const char *,
 359                                struct cifs_sb_info *);
 360         /* query symlink target */
 361         int (*query_symlink)(const unsigned int, struct cifs_tcon *,
 362                              struct cifs_sb_info *, const char *,
 363                              char **, bool);
 364         /* open a file for non-posix mounts */
 365         int (*open)(const unsigned int, struct cifs_open_parms *,
 366                     __u32 *, FILE_ALL_INFO *);
 367         /* set fid protocol-specific info */
 368         void (*set_fid)(struct cifsFileInfo *, struct cifs_fid *, __u32);
 369         /* close a file */
 370         void (*close)(const unsigned int, struct cifs_tcon *,
 371                       struct cifs_fid *);
 372         /* close a file, returning file attributes and timestamps */
 373         void (*close_getattr)(const unsigned int xid, struct cifs_tcon *tcon,
 374                       struct cifsFileInfo *pfile_info);
 375         /* send a flush request to the server */
 376         int (*flush)(const unsigned int, struct cifs_tcon *, struct cifs_fid *);
 377         /* async read from the server */
 378         int (*async_readv)(struct cifs_readdata *);
 379         /* async write to the server */
 380         int (*async_writev)(struct cifs_writedata *,
 381                             void (*release)(struct kref *));
 382         /* sync read from the server */
 383         int (*sync_read)(const unsigned int, struct cifs_fid *,
 384                          struct cifs_io_parms *, unsigned int *, char **,
 385                          int *);
 386         /* sync write to the server */
 387         int (*sync_write)(const unsigned int, struct cifs_fid *,
 388                           struct cifs_io_parms *, unsigned int *, struct kvec *,
 389                           unsigned long);
 390         /* open dir, start readdir */
 391         int (*query_dir_first)(const unsigned int, struct cifs_tcon *,
 392                                const char *, struct cifs_sb_info *,
 393                                struct cifs_fid *, __u16,
 394                                struct cifs_search_info *);
 395         /* continue readdir */
 396         int (*query_dir_next)(const unsigned int, struct cifs_tcon *,
 397                               struct cifs_fid *,
 398                               __u16, struct cifs_search_info *srch_inf);
 399         /* close dir */
 400         int (*close_dir)(const unsigned int, struct cifs_tcon *,
 401                          struct cifs_fid *);
 402         /* calculate a size of SMB message */
 403         unsigned int (*calc_smb_size)(void *buf, struct TCP_Server_Info *ptcpi);
 404         /* check for STATUS_PENDING and process the response if yes */
 405         bool (*is_status_pending)(char *buf, struct TCP_Server_Info *server);
 406         /* check for STATUS_NETWORK_SESSION_EXPIRED */
 407         bool (*is_session_expired)(char *);
 408         /* send oplock break response */
 409         int (*oplock_response)(struct cifs_tcon *, struct cifs_fid *,
 410                                struct cifsInodeInfo *);
 411         /* query remote filesystem */
 412         int (*queryfs)(const unsigned int, struct cifs_tcon *,
 413                        struct cifs_sb_info *, struct kstatfs *);
 414         /* send mandatory brlock to the server */
 415         int (*mand_lock)(const unsigned int, struct cifsFileInfo *, __u64,
 416                          __u64, __u32, int, int, bool);
 417         /* unlock range of mandatory locks */
 418         int (*mand_unlock_range)(struct cifsFileInfo *, struct file_lock *,
 419                                  const unsigned int);
 420         /* push brlocks from the cache to the server */
 421         int (*push_mand_locks)(struct cifsFileInfo *);
 422         /* get lease key of the inode */
 423         void (*get_lease_key)(struct inode *, struct cifs_fid *);
 424         /* set lease key of the inode */
 425         void (*set_lease_key)(struct inode *, struct cifs_fid *);
 426         /* generate new lease key */
 427         void (*new_lease_key)(struct cifs_fid *);
 428         int (*generate_signingkey)(struct cifs_ses *);
 429         int (*calc_signature)(struct smb_rqst *, struct TCP_Server_Info *,
 430                                 bool allocate_crypto);
 431         int (*set_integrity)(const unsigned int, struct cifs_tcon *tcon,
 432                              struct cifsFileInfo *src_file);
 433         int (*enum_snapshots)(const unsigned int xid, struct cifs_tcon *tcon,
 434                              struct cifsFileInfo *src_file, void __user *);
 435         int (*notify)(const unsigned int xid, struct file *pfile,
 436                              void __user *pbuf);
 437         int (*query_mf_symlink)(unsigned int, struct cifs_tcon *,
 438                                 struct cifs_sb_info *, const unsigned char *,
 439                                 char *, unsigned int *);
 440         int (*create_mf_symlink)(unsigned int, struct cifs_tcon *,
 441                                  struct cifs_sb_info *, const unsigned char *,
 442                                  char *, unsigned int *);
 443         /* if we can do cache read operations */
 444         bool (*is_read_op)(__u32);
 445         /* set oplock level for the inode */
 446         void (*set_oplock_level)(struct cifsInodeInfo *, __u32, unsigned int,
 447                                  bool *);
 448         /* create lease context buffer for CREATE request */
 449         char * (*create_lease_buf)(u8 *lease_key, u8 oplock);
 450         /* parse lease context buffer and return oplock/epoch info */
 451         __u8 (*parse_lease_buf)(void *buf, unsigned int *epoch, char *lkey);
 452         ssize_t (*copychunk_range)(const unsigned int,
 453                         struct cifsFileInfo *src_file,
 454                         struct cifsFileInfo *target_file,
 455                         u64 src_off, u64 len, u64 dest_off);
 456         int (*duplicate_extents)(const unsigned int, struct cifsFileInfo *src,
 457                         struct cifsFileInfo *target_file, u64 src_off, u64 len,
 458                         u64 dest_off);
 459         int (*validate_negotiate)(const unsigned int, struct cifs_tcon *);
 460         ssize_t (*query_all_EAs)(const unsigned int, struct cifs_tcon *,
 461                         const unsigned char *, const unsigned char *, char *,
 462                         size_t, struct cifs_sb_info *);
 463         int (*set_EA)(const unsigned int, struct cifs_tcon *, const char *,
 464                         const char *, const void *, const __u16,
 465                         const struct nls_table *, struct cifs_sb_info *);
 466         struct cifs_ntsd * (*get_acl)(struct cifs_sb_info *, struct inode *,
 467                         const char *, u32 *);
 468         struct cifs_ntsd * (*get_acl_by_fid)(struct cifs_sb_info *,
 469                         const struct cifs_fid *, u32 *);
 470         int (*set_acl)(struct cifs_ntsd *, __u32, struct inode *, const char *,
 471                         int);
 472         /* writepages retry size */
 473         unsigned int (*wp_retry_size)(struct inode *);
 474         /* get mtu credits */
 475         int (*wait_mtu_credits)(struct TCP_Server_Info *, unsigned int,
 476                                 unsigned int *, struct cifs_credits *);
 477         /* adjust previously taken mtu credits to request size */
 478         int (*adjust_credits)(struct TCP_Server_Info *server,
 479                               struct cifs_credits *credits,
 480                               const unsigned int payload_size);
 481         /* check if we need to issue closedir */
 482         bool (*dir_needs_close)(struct cifsFileInfo *);
 483         long (*fallocate)(struct file *, struct cifs_tcon *, int, loff_t,
 484                           loff_t);
 485         /* init transform request - used for encryption for now */
 486         int (*init_transform_rq)(struct TCP_Server_Info *, int num_rqst,
 487                                  struct smb_rqst *, struct smb_rqst *);
 488         int (*is_transform_hdr)(void *buf);
 489         int (*receive_transform)(struct TCP_Server_Info *,
 490                                  struct mid_q_entry **, char **, int *);
 491         enum securityEnum (*select_sectype)(struct TCP_Server_Info *,
 492                             enum securityEnum);
 493         int (*next_header)(char *);
 494         /* ioctl passthrough for query_info */
 495         int (*ioctl_query_info)(const unsigned int xid,
 496                                 struct cifs_tcon *tcon,
 497                                 struct cifs_sb_info *cifs_sb,
 498                                 __le16 *path, int is_dir,
 499                                 unsigned long p);
 500         /* make unix special files (block, char, fifo, socket) */
 501         int (*make_node)(unsigned int xid,
 502                          struct inode *inode,
 503                          struct dentry *dentry,
 504                          struct cifs_tcon *tcon,
 505                          char *full_path,
 506                          umode_t mode,
 507                          dev_t device_number);
 508         /* version specific fiemap implementation */
 509         int (*fiemap)(struct cifs_tcon *tcon, struct cifsFileInfo *,
 510                       struct fiemap_extent_info *, u64, u64);
 511         /* version specific llseek implementation */
 512         loff_t (*llseek)(struct file *, struct cifs_tcon *, loff_t, int);
 513 };
 514
 515 struct smb_version_values {
 516         char            *version_string;
 517         __u16           protocol_id;
 518         __u32           req_capabilities;
 519         __u32           large_lock_type;
 520         __u32           exclusive_lock_type;
 521         __u32           shared_lock_type;
 522         __u32           unlock_lock_type;
 523         size_t          header_preamble_size;
 524         size_t          header_size;
 525         size_t          max_header_size;
 526         size_t          read_rsp_size;
 527         __le16          lock_cmd;
 528         unsigned int    cap_unix;
 529         unsigned int    cap_nt_find;
 530         unsigned int    cap_large_files;
 531         __u16           signing_enabled;
 532         __u16           signing_required;
 533         size_t          create_lease_size;
 534 };
 535
 536 #define HEADER_SIZE(server) (server->vals->header_size)
 537 #define MAX_HEADER_SIZE(server) (server->vals->max_header_size)
 538
 539 struct smb_vol {
 540         char *username;
 541         char *password;
 542         char *domainname;
 543         char *UNC;
 544         char *iocharset;  /* local code page for mapping to and from Unicode */
 545         char source_rfc1001_name[RFC1001_NAME_LEN_WITH_NULL]; /* clnt nb name */
 546         char target_rfc1001_name[RFC1001_NAME_LEN_WITH_NULL]; /* srvr nb name */
 547         kuid_t cred_uid;
 548         kuid_t linux_uid;
 549         kgid_t linux_gid;
 550         kuid_t backupuid;
 551         kgid_t backupgid;
 552         umode_t file_mode;
 553         umode_t dir_mode;
 554         enum securityEnum sectype; /* sectype requested via mnt opts */
 555         bool sign; /* was signing requested via mnt opts? */
 556         bool ignore_signature:1;
 557         bool retry:1;
 558         bool intr:1;
 559         bool setuids:1;
 560         bool setuidfromacl:1;
 561         bool override_uid:1;
 562         bool override_gid:1;
 563         bool dynperm:1;
 564         bool noperm:1;
 565         bool nodelete:1;
 566         bool mode_ace:1;
 567         bool no_psx_acl:1; /* set if posix acl support should be disabled */
 568         bool cifs_acl:1;
 569         bool backupuid_specified; /* mount option  backupuid  is specified */
 570         bool backupgid_specified; /* mount option  backupgid  is specified */
 571         bool no_xattr:1;   /* set if xattr (EA) support should be disabled*/
 572         bool server_ino:1; /* use inode numbers from server ie UniqueId */
 573         bool direct_io:1;
 574         bool strict_io:1; /* strict cache behavior */
 575         bool cache_ro:1;
 576         bool cache_rw:1;
 577         bool remap:1;      /* set to remap seven reserved chars in filenames */
 578         bool sfu_remap:1;  /* remap seven reserved chars ala SFU */
 579         bool posix_paths:1; /* unset to not ask for posix pathnames. */
 580         bool no_linux_ext:1;
 581         bool linux_ext:1;
 582         bool sfu_emul:1;
 583         bool nullauth:1;   /* attempt to authenticate with null user */
 584         bool nocase:1;     /* request case insensitive filenames */
 585         bool nobrl:1;      /* disable sending byte range locks to srv */
 586         bool nohandlecache:1; /* disable caching dir handles if srvr probs */
 587         bool mand_lock:1;  /* send mandatory not posix byte range lock reqs */
 588         bool seal:1;       /* request transport encryption on share */
 589         bool nodfs:1;      /* Do not request DFS, even if available */
 590         bool local_lease:1; /* check leases only on local system, not remote */
 591         bool noblocksnd:1;
 592         bool noautotune:1;
 593         bool nostrictsync:1; /* do not force expensive SMBflush on every sync */
 594         bool no_lease:1;     /* disable requesting leases */
 595         bool fsc:1;     /* enable fscache */
 596         bool mfsymlinks:1; /* use Minshall+French Symlinks */
 597         bool multiuser:1;
 598         bool rwpidforward:1; /* pid forward for read/write operations */
 599         bool nosharesock:1;
 600         bool persistent:1;
 601         bool nopersistent:1;
 602         bool resilient:1; /* noresilient not required since not fored for CA */
 603         bool domainauto:1;
 604         bool rdma:1;
 605         bool multichannel:1;
 606         bool use_client_guid:1;
 607         /* reuse existing guid for multichannel */
 608         u8 client_guid[SMB2_CLIENT_GUID_SIZE];
 609         unsigned int bsize;
 610         unsigned int rsize;
 611         unsigned int wsize;
 612         unsigned int min_offload;
 613         bool sockopt_tcp_nodelay:1;
 614         unsigned long actimeo; /* attribute cache timeout (jiffies) */
 615         struct smb_version_operations *ops;
 616         struct smb_version_values *vals;
 617         char *prepath;
 618         struct sockaddr_storage dstaddr; /* destination address */
 619         struct sockaddr_storage srcaddr; /* allow binding to a local IP */
 620         struct nls_table *local_nls;
 621         unsigned int echo_interval; /* echo interval in secs */
 622         __u64 snapshot_time; /* needed for timewarp tokens */
 623         __u32 handle_timeout; /* persistent and durable handle timeout in ms */
 624         unsigned int max_credits; /* smb3 max_credits 10 < credits < 60000 */
 625         unsigned int max_channels;
 626         __u16 compression; /* compression algorithm 0xFFFF default 0=disabled */
 627         bool rootfs:1; /* if it's a SMB root file system */
 628 };
 629
 630 /**
 631  * CIFS superblock mount flags (mnt_cifs_flags) to consider when
 632  * trying to reuse existing superblock for a new mount
 633  */
 634 #define CIFS_MOUNT_MASK (CIFS_MOUNT_NO_PERM | CIFS_MOUNT_SET_UID | \
 635                          CIFS_MOUNT_SERVER_INUM | CIFS_MOUNT_DIRECT_IO | \
 636                          CIFS_MOUNT_NO_XATTR | CIFS_MOUNT_MAP_SPECIAL_CHR | \
 637                          CIFS_MOUNT_MAP_SFM_CHR | \
 638                          CIFS_MOUNT_UNX_EMUL | CIFS_MOUNT_NO_BRL | \
 639                          CIFS_MOUNT_CIFS_ACL | CIFS_MOUNT_OVERR_UID | \
 640                          CIFS_MOUNT_OVERR_GID | CIFS_MOUNT_DYNPERM | \
 641                          CIFS_MOUNT_NOPOSIXBRL | CIFS_MOUNT_NOSSYNC | \
 642                          CIFS_MOUNT_FSCACHE | CIFS_MOUNT_MF_SYMLINKS | \
 643                          CIFS_MOUNT_MULTIUSER | CIFS_MOUNT_STRICT_IO | \
 644                          CIFS_MOUNT_CIFS_BACKUPUID | CIFS_MOUNT_CIFS_BACKUPGID | \
 645                          CIFS_MOUNT_UID_FROM_ACL | CIFS_MOUNT_NO_HANDLE_CACHE | \
 646                          CIFS_MOUNT_NO_DFS | CIFS_MOUNT_MODE_FROM_SID | \
 647                          CIFS_MOUNT_RO_CACHE | CIFS_MOUNT_RW_CACHE)
 648
 649 /**
 650  * Generic VFS superblock mount flags (s_flags) to consider when
 651  * trying to reuse existing superblock for a new mount
 652  */
 653 #define CIFS_MS_MASK (SB_RDONLY | SB_MANDLOCK | SB_NOEXEC | SB_NOSUID | \
 654                       SB_NODEV | SB_SYNCHRONOUS)
 655
 656 struct cifs_mnt_data {
 657         struct cifs_sb_info *cifs_sb;
 658         struct smb_vol *vol;
 659         int flags;
 660 };
 661
 662 static inline unsigned int
 663 get_rfc1002_length(void *buf)
 664 {
 665         return be32_to_cpu(*((__be32 *)buf)) & 0xffffff;
 666 }
 667
 668 static inline void
 669 inc_rfc1001_len(void *buf, int count)
 670 {
 671         be32_add_cpu((__be32 *)buf, count);
 672 }
 673
 674 struct TCP_Server_Info {
 675         struct list_head tcp_ses_list;
 676         struct list_head smb_ses_list;
 677         int srv_count; /* reference counter */
 678         /* 15 character server name + 0x20 16th byte indicating type = srv */
 679         char server_RFC1001_name[RFC1001_NAME_LEN_WITH_NULL];
 680         struct smb_version_operations   *ops;
 681         struct smb_version_values       *vals;
 682         enum statusEnum tcpStatus; /* what we think the status is */
 683         char *hostname; /* hostname portion of UNC string */
 684         struct socket *ssocket;
 685         struct sockaddr_storage dstaddr;
 686         struct sockaddr_storage srcaddr; /* locally bind to this IP */
 687 #ifdef CONFIG_NET_NS
 688         struct net *net;
 689 #endif
 690         wait_queue_head_t response_q;
 691         wait_queue_head_t request_q; /* if more than maxmpx to srvr must block*/
 692         struct list_head pending_mid_q;
 693         bool noblocksnd;                /* use blocking sendmsg */
 694         bool noautotune;                /* do not autotune send buf sizes */
 695         bool tcp_nodelay;
 696         unsigned int credits;  /* send no more requests at once */
 697         unsigned int max_credits; /* can override large 32000 default at mnt */
 698         unsigned int in_flight;  /* number of requests on the wire to server */
 699         unsigned int max_in_flight; /* max number of requests that were on wire */
 700         spinlock_t req_lock;  /* protect the two values above */
 701         struct mutex srv_mutex;
 702         struct task_struct *tsk;
 703         char server_GUID[16];
 704         __u16 sec_mode;
 705         bool sign; /* is signing enabled on this connection? */
 706         bool ignore_signature:1; /* skip validation of signatures in SMB2/3 rsp */
 707         bool session_estab; /* mark when very first sess is established */
 708         int echo_credits;  /* echo reserved slots */
 709         int oplock_credits;  /* oplock break reserved slots */
 710         bool echoes:1; /* enable echoes */
 711         __u8 client_guid[SMB2_CLIENT_GUID_SIZE]; /* Client GUID */
 712         u16 dialect; /* dialect index that server chose */
 713         bool oplocks:1; /* enable oplocks */
 714         unsigned int maxReq;    /* Clients should submit no more */
 715         /* than maxReq distinct unanswered SMBs to the server when using  */
 716         /* multiplexed reads or writes (for SMB1/CIFS only, not SMB2/SMB3) */
 717         unsigned int maxBuf;    /* maxBuf specifies the maximum */
 718         /* message size the server can send or receive for non-raw SMBs */
 719         /* maxBuf is returned by SMB NegotiateProtocol so maxBuf is only 0 */
 720         /* when socket is setup (and during reconnect) before NegProt sent */
 721         unsigned int max_rw;    /* maxRw specifies the maximum */
 722         /* message size the server can send or receive for */
 723         /* SMB_COM_WRITE_RAW or SMB_COM_READ_RAW. */
 724         unsigned int capabilities; /* selective disabling of caps by smb sess */
 725         int timeAdj;  /* Adjust for difference in server time zone in sec */
 726         __u64 CurrentMid;         /* multiplex id - rotating counter */
 727         char cryptkey[CIFS_CRYPTO_KEY_SIZE]; /* used by ntlm, ntlmv2 etc */
 728         /* 16th byte of RFC1001 workstation name is always null */
 729         char workstation_RFC1001_name[RFC1001_NAME_LEN_WITH_NULL];
 730         __u32 sequence_number; /* for signing, protected by srv_mutex */
 731         __u32 reconnect_instance; /* incremented on each reconnect */
 732         struct session_key session_key;
 733         unsigned long lstrp; /* when we got last response from this server */
 734         struct cifs_secmech secmech; /* crypto sec mech functs, descriptors */
 735 #define CIFS_NEGFLAVOR_LANMAN   0       /* wct == 13, LANMAN */
 736 #define CIFS_NEGFLAVOR_UNENCAP  1       /* wct == 17, but no ext_sec */
 737 #define CIFS_NEGFLAVOR_EXTENDED 2       /* wct == 17, ext_sec bit set */
 738         char    negflavor;      /* NEGOTIATE response flavor */
 739         /* extended security flavors that server supports */
 740         bool    sec_ntlmssp;            /* supports NTLMSSP */
 741         bool    sec_kerberosu2u;        /* supports U2U Kerberos */
 742         bool    sec_kerberos;           /* supports plain Kerberos */
 743         bool    sec_mskerberos;         /* supports legacy MS Kerberos */
 744         bool    large_buf;              /* is current buffer large? */
 745         /* use SMBD connection instead of socket */
 746         bool    rdma;
 747         /* point to the SMBD connection if RDMA is used instead of socket */
 748         struct smbd_connection *smbd_conn;
 749         struct delayed_work     echo; /* echo ping workqueue job */
 750         char    *smallbuf;      /* pointer to current "small" buffer */
 751         char    *bigbuf;        /* pointer to current "big" buffer */
 752         /* Total size of this PDU. Only valid from cifs_demultiplex_thread */
 753         unsigned int pdu_size;
 754         unsigned int total_read; /* total amount of data read in this pass */
 755         atomic_t in_send; /* requests trying to send */
 756         atomic_t num_waiters;   /* blocked waiting to get in sendrecv */
 757 #ifdef CONFIG_CIFS_FSCACHE
 758         struct fscache_cookie   *fscache; /* client index cache cookie */
 759 #endif
 760 #ifdef CONFIG_CIFS_STATS2
 761         atomic_t num_cmds[NUMBER_OF_SMB2_COMMANDS]; /* total requests by cmd */
 762         atomic_t smb2slowcmd[NUMBER_OF_SMB2_COMMANDS]; /* count resps > 1 sec */
 763         __u64 time_per_cmd[NUMBER_OF_SMB2_COMMANDS]; /* total time per cmd */
 764         __u32 slowest_cmd[NUMBER_OF_SMB2_COMMANDS];
 765         __u32 fastest_cmd[NUMBER_OF_SMB2_COMMANDS];
 766 #endif /* STATS2 */
 767         unsigned int    max_read;
 768         unsigned int    max_write;
 769         unsigned int    min_offload;
 770         __le16  compress_algorithm;
 771         __le16  cipher_type;
 772          /* save initital negprot hash */
 773         __u8    preauth_sha_hash[SMB2_PREAUTH_HASH_SIZE];
 774         bool    posix_ext_supported;
 775         struct delayed_work reconnect; /* reconnect workqueue job */
 776         struct mutex reconnect_mutex; /* prevent simultaneous reconnects */
 777         unsigned long echo_interval;
 778
 779         /*
 780          * Number of targets available for reconnect. The more targets
 781          * the more tasks have to wait to let the demultiplex thread
 782          * reconnect.
 783          */
 784         int nr_targets;
 785         bool noblockcnt; /* use non-blocking connect() */
 786         bool is_channel; /* if a session channel */
 787 };
 788
 789 struct cifs_credits {
 790         unsigned int value;
 791         unsigned int instance;
 792 };
 793
 794 static inline unsigned int
 795 in_flight(struct TCP_Server_Info *server)
 796 {
 797         unsigned int num;
 798         spin_lock(&server->req_lock);
 799         num = server->in_flight;
 800         spin_unlock(&server->req_lock);
 801         return num;
 802 }
 803
 804 static inline bool
 805 has_credits(struct TCP_Server_Info *server, int *credits, int num_credits)
 806 {
 807         int num;
 808         spin_lock(&server->req_lock);
 809         num = *credits;
 810         spin_unlock(&server->req_lock);
 811         return num >= num_credits;
 812 }
 813
 814 static inline void
 815 add_credits(struct TCP_Server_Info *server, const struct cifs_credits *credits,
 816             const int optype)
 817 {
 818         server->ops->add_credits(server, credits, optype);
 819 }
 820
 821 static inline void
 822 add_credits_and_wake_if(struct TCP_Server_Info *server,
 823                         const struct cifs_credits *credits, const int optype)
 824 {
 825         if (credits->value) {
 826                 server->ops->add_credits(server, credits, optype);
 827                 wake_up(&server->request_q);
 828         }
 829 }
 830
 831 static inline void
 832 set_credits(struct TCP_Server_Info *server, const int val)
 833 {
 834         server->ops->set_credits(server, val);
 835 }
 836
 837 static inline int
 838 adjust_credits(struct TCP_Server_Info *server, struct cifs_credits *credits,
 839                const unsigned int payload_size)
 840 {
 841         return server->ops->adjust_credits ?
 842                 server->ops->adjust_credits(server, credits, payload_size) : 0;
 843 }
 844
 845 static inline __le64
 846 get_next_mid64(struct TCP_Server_Info *server)
 847 {
 848         return cpu_to_le64(server->ops->get_next_mid(server));
 849 }
 850
 851 static inline __le16
 852 get_next_mid(struct TCP_Server_Info *server)
 853 {
 854         __u16 mid = server->ops->get_next_mid(server);
 855         /*
 856          * The value in the SMB header should be little endian for easy
 857          * on-the-wire decoding.
 858          */
 859         return cpu_to_le16(mid);
 860 }
 861
 862 static inline void
 863 revert_current_mid(struct TCP_Server_Info *server, const unsigned int val)
 864 {
 865         if (server->ops->revert_current_mid)
 866                 server->ops->revert_current_mid(server, val);
 867 }
 868
 869 static inline void
 870 revert_current_mid_from_hdr(struct TCP_Server_Info *server,
 871                             const struct smb2_sync_hdr *shdr)
 872 {
 873         unsigned int num = le16_to_cpu(shdr->CreditCharge);
 874
 875         return revert_current_mid(server, num > 0 ? num : 1);
 876 }
 877
 878 static inline __u16
 879 get_mid(const struct smb_hdr *smb)
 880 {
 881         return le16_to_cpu(smb->Mid);
 882 }
 883
 884 static inline bool
 885 compare_mid(__u16 mid, const struct smb_hdr *smb)
 886 {
 887         return mid == le16_to_cpu(smb->Mid);
 888 }
 889
 890 /*
 891  * When the server supports very large reads and writes via POSIX extensions,
 892  * we can allow up to 2^24-1, minus the size of a READ/WRITE_AND_X header, not
 893  * including the RFC1001 length.
 894  *
 895  * Note that this might make for "interesting" allocation problems during
 896  * writeback however as we have to allocate an array of pointers for the
 897  * pages. A 16M write means ~32kb page array with PAGE_SIZE == 4096.
 898  *
 899  * For reads, there is a similar problem as we need to allocate an array
 900  * of kvecs to handle the receive, though that should only need to be done
 901  * once.
 902  */
 903 #define CIFS_MAX_WSIZE ((1<<24) - 1 - sizeof(WRITE_REQ) + 4)
 904 #define CIFS_MAX_RSIZE ((1<<24) - sizeof(READ_RSP) + 4)
 905
 906 /*
 907  * When the server doesn't allow large posix writes, only allow a rsize/wsize
 908  * of 2^17-1 minus the size of the call header. That allows for a read or
 909  * write up to the maximum size described by RFC1002.
 910  */
 911 #define CIFS_MAX_RFC1002_WSIZE ((1<<17) - 1 - sizeof(WRITE_REQ) + 4)
 912 #define CIFS_MAX_RFC1002_RSIZE ((1<<17) - 1 - sizeof(READ_RSP) + 4)
 913
 914 /*
 915  * The default wsize is 1M. find_get_pages seems to return a maximum of 256
 916  * pages in a single call. With PAGE_SIZE == 4k, this means we can fill
 917  * a single wsize request with a single call.
 918  */
 919 #define CIFS_DEFAULT_IOSIZE (1024 * 1024)
 920 #define SMB3_DEFAULT_IOSIZE (4 * 1024 * 1024)
 921
 922 /*
 923  * Windows only supports a max of 60kb reads and 65535 byte writes. Default to
 924  * those values when posix extensions aren't in force. In actuality here, we
 925  * use 65536 to allow for a write that is a multiple of 4k. Most servers seem
 926  * to be ok with the extra byte even though Windows doesn't send writes that
 927  * are that large.
 928  *
 929  * Citation:
 930  *
 931  * https://blogs.msdn.com/b/openspecification/archive/2009/04/10/smb-maximum-transmit-buffer-size-and-performance-tuning.aspx
 932  */
 933 #define CIFS_DEFAULT_NON_POSIX_RSIZE (60 * 1024)
 934 #define CIFS_DEFAULT_NON_POSIX_WSIZE (65536)
 935
 936 /*
 937  * Macros to allow the TCP_Server_Info->net field and related code to drop out
 938  * when CONFIG_NET_NS isn't set.
 939  */
 940
 941 #ifdef CONFIG_NET_NS
 942
 943 static inline struct net *cifs_net_ns(struct TCP_Server_Info *srv)
 944 {
 945         return srv->net;
 946 }
 947
 948 static inline void cifs_set_net_ns(struct TCP_Server_Info *srv, struct net *net)
 949 {
 950         srv->net = net;
 951 }
 952
 953 #else
 954
 955 static inline struct net *cifs_net_ns(struct TCP_Server_Info *srv)
 956 {
 957         return &init_net;
 958 }
 959
 960 static inline void cifs_set_net_ns(struct TCP_Server_Info *srv, struct net *net)
 961 {
 962 }
 963
 964 #endif
 965
 966 struct cifs_server_iface {
 967         size_t speed;
 968         unsigned int rdma_capable : 1;
 969         unsigned int rss_capable : 1;
 970         struct sockaddr_storage sockaddr;
 971 };
 972
 973 struct cifs_chan {
 974         struct TCP_Server_Info *server;
 975         __u8 signkey[SMB3_SIGN_KEY_SIZE];
 976 };
 977
 978 /*
 979  * Session structure.  One of these for each uid session with a particular host
 980  */
 981 struct cifs_ses {
 982         struct list_head smb_ses_list;
 983         struct list_head tcon_list;
 984         struct cifs_tcon *tcon_ipc;
 985         struct mutex session_mutex;
 986         struct TCP_Server_Info *server; /* pointer to server info */
 987         int ses_count;          /* reference counter */
 988         enum statusEnum status;
 989         unsigned overrideSecFlg;  /* if non-zero override global sec flags */
 990         char *serverOS;         /* name of operating system underlying server */
 991         char *serverNOS;        /* name of network operating system of server */
 992         char *serverDomain;     /* security realm of server */
 993         __u64 Suid;             /* remote smb uid  */
 994         kuid_t linux_uid;       /* overriding owner of files on the mount */
 995         kuid_t cred_uid;        /* owner of credentials */
 996         unsigned int capabilities;
 997         char serverName[SERVER_NAME_LEN_WITH_NULL];
 998         char *user_name;        /* must not be null except during init of sess
 999                                    and after mount option parsing we fill it */
1000         char *domainName;
1001         char *password;
1002         struct session_key auth_key;
1003         struct ntlmssp_auth *ntlmssp; /* ciphertext, flags, server challenge */
1004         enum securityEnum sectype; /* what security flavor was specified? */
1005         bool sign;              /* is signing required? */
1006         bool need_reconnect:1; /* connection reset, uid now invalid */
1007         bool domainAuto:1;
1008         bool binding:1; /* are we binding the session? */
1009         __u16 session_flags;
1010         __u8 smb3signingkey[SMB3_SIGN_KEY_SIZE];
1011         __u8 smb3encryptionkey[SMB3_SIGN_KEY_SIZE];
1012         __u8 smb3decryptionkey[SMB3_SIGN_KEY_SIZE];
1013         __u8 preauth_sha_hash[SMB2_PREAUTH_HASH_SIZE];
1014
1015         __u8 binding_preauth_sha_hash[SMB2_PREAUTH_HASH_SIZE];
1016
1017         /*
1018          * Network interfaces available on the server this session is
1019          * connected to.
1020          *
1021          * Other channels can be opened by connecting and binding this
1022          * session to interfaces from this list.
1023          *
1024          * iface_lock should be taken when accessing any of these fields
1025          */
1026         spinlock_t iface_lock;
1027         struct cifs_server_iface *iface_list;
1028         size_t iface_count;
1029         unsigned long iface_last_update; /* jiffies */
1030
1031 #define CIFS_MAX_CHANNELS 16
1032         struct cifs_chan chans[CIFS_MAX_CHANNELS];
1033         struct cifs_chan *binding_chan;
1034         size_t chan_count;
1035         size_t chan_max;
1036         atomic_t chan_seq; /* round robin state */
1037 };
1038
1039 /*
1040  * When binding a new channel, we need to access the channel which isn't fully
1041  * established yet.
1042  */
1043
1044 static inline
1045 struct cifs_chan *cifs_ses_binding_channel(struct cifs_ses *ses)
1046 {
1047         if (ses->binding)
1048                 return ses->binding_chan;
1049         else
1050                 return NULL;
1051 }
1052
1053 /*
1054  * Returns the server pointer of the session. When binding a new
1055  * channel this returns the last channel which isn't fully established
1056  * yet.
1057  *
1058  * This function should be use for negprot/sess.setup codepaths. For
1059  * the other requests see cifs_pick_channel().
1060  */
1061 static inline
1062 struct TCP_Server_Info *cifs_ses_server(struct cifs_ses *ses)
1063 {
1064         if (ses->binding)
1065                 return ses->binding_chan->server;
1066         else
1067                 return ses->server;
1068 }
1069
1070 static inline bool
1071 cap_unix(struct cifs_ses *ses)
1072 {
1073         return ses->server->vals->cap_unix & ses->capabilities;
1074 }
1075
1076 struct cached_fid {
1077         bool is_valid:1;        /* Do we have a useable root fid */
1078         bool file_all_info_is_valid:1;
1079         bool has_lease:1;
1080         struct kref refcount;
1081         struct cifs_fid *fid;
1082         struct mutex fid_mutex;
1083         struct cifs_tcon *tcon;
1084         struct work_struct lease_break;
1085         struct smb2_file_all_info file_all_info;
1086 };
1087
1088 /*
1089  * there is one of these for each connection to a resource on a particular
1090  * session
1091  */
1092 struct cifs_tcon {
1093         struct list_head tcon_list;
1094         int tc_count;
1095         struct list_head rlist; /* reconnect list */
1096         atomic_t num_local_opens;  /* num of all opens including disconnected */
1097         atomic_t num_remote_opens; /* num of all network opens on server */
1098         struct list_head openFileList;
1099         spinlock_t open_file_lock; /* protects list above */
1100         struct cifs_ses *ses;   /* pointer to session associated with */
1101         char treeName[MAX_TREE_SIZE + 1]; /* UNC name of resource in ASCII */
1102         char *nativeFileSystem;
1103         char *password;         /* for share-level security */
1104         __u32 tid;              /* The 4 byte tree id */
1105         __u16 Flags;            /* optional support bits */
1106         enum statusEnum tidStatus;
1107         atomic_t num_smbs_sent;
1108         union {
1109                 struct {
1110                         atomic_t num_writes;
1111                         atomic_t num_reads;
1112                         atomic_t num_flushes;
1113                         atomic_t num_oplock_brks;
1114                         atomic_t num_opens;
1115                         atomic_t num_closes;
1116                         atomic_t num_deletes;
1117                         atomic_t num_mkdirs;
1118                         atomic_t num_posixopens;
1119                         atomic_t num_posixmkdirs;
1120                         atomic_t num_rmdirs;
1121                         atomic_t num_renames;
1122                         atomic_t num_t2renames;
1123                         atomic_t num_ffirst;
1124                         atomic_t num_fnext;
1125                         atomic_t num_fclose;
1126                         atomic_t num_hardlinks;
1127                         atomic_t num_symlinks;
1128                         atomic_t num_locks;
1129                         atomic_t num_acl_get;
1130                         atomic_t num_acl_set;
1131                 } cifs_stats;
1132                 struct {
1133                         atomic_t smb2_com_sent[NUMBER_OF_SMB2_COMMANDS];
1134                         atomic_t smb2_com_failed[NUMBER_OF_SMB2_COMMANDS];
1135                 } smb2_stats;
1136         } stats;
1137         __u64    bytes_read;
1138         __u64    bytes_written;
1139         spinlock_t stat_lock;  /* protects the two fields above */
1140         FILE_SYSTEM_DEVICE_INFO fsDevInfo;
1141         FILE_SYSTEM_ATTRIBUTE_INFO fsAttrInfo; /* ok if fs name truncated */
1142         FILE_SYSTEM_UNIX_INFO fsUnixInfo;
1143         bool ipc:1;   /* set if connection to IPC$ share (always also pipe) */
1144         bool pipe:1;  /* set if connection to pipe share */
1145         bool print:1; /* set if connection to printer share */
1146         bool retry:1;
1147         bool nocase:1;
1148         bool nohandlecache:1; /* if strange server resource prob can turn off */
1149         bool nodelete:1;
1150         bool seal:1;      /* transport encryption for this mounted share */
1151         bool unix_ext:1;  /* if false disable Linux extensions to CIFS protocol
1152                                 for this mount even if server would support */
1153         bool posix_extensions; /* if true SMB3.11 posix extensions enabled */
1154         bool local_lease:1; /* check leases (only) on local system not remote */
1155         bool broken_posix_open; /* e.g. Samba server versions < 3.3.2, 3.2.9 */
1156         bool broken_sparse_sup; /* if server or share does not support sparse */
1157         bool need_reconnect:1; /* connection reset, tid now invalid */
1158         bool need_reopen_files:1; /* need to reopen tcon file handles */
1159         bool use_resilient:1; /* use resilient instead of durable handles */
1160         bool use_persistent:1; /* use persistent instead of durable handles */
1161         bool no_lease:1;    /* Do not request leases on files or directories */
1162         __le32 capabilities;
1163         __u32 share_flags;
1164         __u32 maximal_access;
1165         __u32 vol_serial_number;
1166         __le64 vol_create_time;
1167         __u64 snapshot_time; /* for timewarp tokens - timestamp of snapshot */
1168         __u32 handle_timeout; /* persistent and durable handle timeout in ms */
1169         __u32 ss_flags;         /* sector size flags */
1170         __u32 perf_sector_size; /* best sector size for perf */
1171         __u32 max_chunks;
1172         __u32 max_bytes_chunk;
1173         __u32 max_bytes_copy;
1174 #ifdef CONFIG_CIFS_FSCACHE
1175         u64 resource_id;                /* server resource id */
1176         struct fscache_cookie *fscache; /* cookie for share */
1177 #endif
1178         struct list_head pending_opens; /* list of incomplete opens */
1179         struct cached_fid crfid; /* Cached root fid */
1180         /* BB add field for back pointer to sb struct(s)? */
1181 #ifdef CONFIG_CIFS_DFS_UPCALL
1182         char *dfs_path;
1183         int remap:2;
1184         struct list_head ulist; /* cache update list */
1185 #endif
1186 };
1187
1188 /*
1189  * This is a refcounted and timestamped container for a tcon pointer. The
1190  * container holds a tcon reference. It is considered safe to free one of
1191  * these when the tl_count goes to 0. The tl_time is the time of the last
1192  * "get" on the container.
1193  */
1194 struct tcon_link {
1195         struct rb_node          tl_rbnode;
1196         kuid_t                  tl_uid;
1197         unsigned long           tl_flags;
1198 #define TCON_LINK_MASTER        0
1199 #define TCON_LINK_PENDING       1
1200 #define TCON_LINK_IN_TREE       2
1201         unsigned long           tl_time;
1202         atomic_t                tl_count;
1203         struct cifs_tcon        *tl_tcon;
1204 };
1205
1206 extern struct tcon_link *cifs_sb_tlink(struct cifs_sb_info *cifs_sb);
1207 extern void smb3_free_compound_rqst(int num_rqst, struct smb_rqst *rqst);
1208
1209 static inline struct cifs_tcon *
1210 tlink_tcon(struct tcon_link *tlink)
1211 {
1212         return tlink->tl_tcon;
1213 }
1214
1215 static inline struct tcon_link *
1216 cifs_sb_master_tlink(struct cifs_sb_info *cifs_sb)
1217 {
1218         return cifs_sb->master_tlink;
1219 }
1220
1221 extern void cifs_put_tlink(struct tcon_link *tlink);
1222
1223 static inline struct tcon_link *
1224 cifs_get_tlink(struct tcon_link *tlink)
1225 {
1226         if (tlink && !IS_ERR(tlink))
1227                 atomic_inc(&tlink->tl_count);
1228         return tlink;
1229 }
1230
1231 /* This function is always expected to succeed */
1232 extern struct cifs_tcon *cifs_sb_master_tcon(struct cifs_sb_info *cifs_sb);
1233
1234 #define CIFS_OPLOCK_NO_CHANGE 0xfe
1235
1236 struct cifs_pending_open {
1237         struct list_head olist;
1238         struct tcon_link *tlink;
1239         __u8 lease_key[16];
1240         __u32 oplock;
1241 };
1242
1243 /*
1244  * This info hangs off the cifsFileInfo structure, pointed to by llist.
1245  * This is used to track byte stream locks on the file
1246  */
1247 struct cifsLockInfo {
1248         struct list_head llist; /* pointer to next cifsLockInfo */
1249         struct list_head blist; /* pointer to locks blocked on this */
1250         wait_queue_head_t block_q;
1251         __u64 offset;
1252         __u64 length;
1253         __u32 pid;
1254         __u16 type;
1255         __u16 flags;
1256 };
1257
1258 /*
1259  * One of these for each open instance of a file
1260  */
1261 struct cifs_search_info {
1262         loff_t index_of_last_entry;
1263         __u16 entries_in_buffer;
1264         __u16 info_level;
1265         __u32 resume_key;
1266         char *ntwrk_buf_start;
1267         char *srch_entries_start;
1268         char *last_entry;
1269         const char *presume_name;
1270         unsigned int resume_name_len;
1271         bool endOfSearch:1;
1272         bool emptyDir:1;
1273         bool unicode:1;
1274         bool smallBuf:1; /* so we know which buf_release function to call */
1275 };
1276
1277 #define ACL_NO_MODE     ((umode_t)(-1))
1278 struct cifs_open_parms {
1279         struct cifs_tcon *tcon;
1280         struct cifs_sb_info *cifs_sb;
1281         int disposition;
1282         int desired_access;
1283         int create_options;
1284         const char *path;
1285         struct cifs_fid *fid;
1286         umode_t mode;
1287         bool reconnect:1;
1288 };
1289
1290 struct cifs_fid {
1291         __u16 netfid;
1292         __u64 persistent_fid;   /* persist file id for smb2 */
1293         __u64 volatile_fid;     /* volatile file id for smb2 */
1294         __u8 lease_key[SMB2_LEASE_KEY_SIZE];    /* lease key for smb2 */
1295         __u8 create_guid[16];
1296         __u32 access;
1297         struct cifs_pending_open *pending_open;
1298         unsigned int epoch;
1299 #ifdef CONFIG_CIFS_DEBUG2
1300         __u64 mid;
1301 #endif /* CIFS_DEBUG2 */
1302         bool purge_cache;
1303 };
1304
1305 struct cifs_fid_locks {
1306         struct list_head llist;
1307         struct cifsFileInfo *cfile;     /* fid that owns locks */
1308         struct list_head locks;         /* locks held by fid above */
1309 };
1310
1311 struct cifsFileInfo {
1312         /* following two lists are protected by tcon->open_file_lock */
1313         struct list_head tlist; /* pointer to next fid owned by tcon */
1314         struct list_head flist; /* next fid (file instance) for this inode */
1315         /* lock list below protected by cifsi->lock_sem */
1316         struct cifs_fid_locks *llist;   /* brlocks held by this fid */
1317         kuid_t uid;             /* allows finding which FileInfo structure */
1318         __u32 pid;              /* process id who opened file */
1319         struct cifs_fid fid;    /* file id from remote */
1320         struct list_head rlist; /* reconnect list */
1321         /* BB add lock scope info here if needed */ ;
1322         /* lock scope id (0 if none) */
1323         struct dentry *dentry;
1324         struct tcon_link *tlink;
1325         unsigned int f_flags;
1326         bool invalidHandle:1;   /* file closed via session abend */
1327         bool swapfile:1;
1328         bool oplock_break_cancelled:1;
1329         unsigned int oplock_epoch; /* epoch from the lease break */
1330         __u32 oplock_level; /* oplock/lease level from the lease break */
1331         int count;
1332         spinlock_t file_info_lock; /* protects four flag/count fields above */
1333         struct mutex fh_mutex; /* prevents reopen race after dead ses*/
1334         struct cifs_search_info srch_inf;
1335         struct work_struct oplock_break; /* work for oplock breaks */
1336         struct work_struct put; /* work for the final part of _put */
1337 };
1338
1339 struct cifs_io_parms {
1340         __u16 netfid;
1341         __u64 persistent_fid;   /* persist file id for smb2 */
1342         __u64 volatile_fid;     /* volatile file id for smb2 */
1343         __u32 pid;
1344         __u64 offset;
1345         unsigned int length;
1346         struct cifs_tcon *tcon;
1347         struct TCP_Server_Info *server;
1348 };
1349
1350 struct cifs_aio_ctx {
1351         struct kref             refcount;
1352         struct list_head        list;
1353         struct mutex            aio_mutex;
1354         struct completion       done;
1355         struct iov_iter         iter;
1356         struct kiocb            *iocb;
1357         struct cifsFileInfo     *cfile;
1358         struct bio_vec          *bv;
1359         loff_t                  pos;
1360         unsigned int            npages;
1361         ssize_t                 rc;
1362         unsigned int            len;
1363         unsigned int            total_len;
1364         bool                    should_dirty;
1365         /*
1366          * Indicates if this aio_ctx is for direct_io,
1367          * If yes, iter is a copy of the user passed iov_iter
1368          */
1369         bool                    direct_io;
1370 };
1371
1372 struct cifs_readdata;
1373
1374 /* asynchronous read support */
1375 struct cifs_readdata {
1376         struct kref                     refcount;
1377         struct list_head                list;
1378         struct completion               done;
1379         struct cifsFileInfo             *cfile;
1380         struct address_space            *mapping;
1381         struct cifs_aio_ctx             *ctx;
1382         __u64                           offset;
1383         unsigned int                    bytes;
1384         unsigned int                    got_bytes;
1385         pid_t                           pid;
1386         int                             result;
1387         struct work_struct              work;
1388         int (*read_into_pages)(struct TCP_Server_Info *server,
1389                                 struct cifs_readdata *rdata,
1390                                 unsigned int len);
1391         int (*copy_into_pages)(struct TCP_Server_Info *server,
1392                                 struct cifs_readdata *rdata,
1393                                 struct iov_iter *iter);
1394         struct kvec                     iov[2];
1395         struct TCP_Server_Info          *server;
1396 #ifdef CONFIG_CIFS_SMB_DIRECT
1397         struct smbd_mr                  *mr;
1398 #endif
1399         unsigned int                    pagesz;
1400         unsigned int                    page_offset;
1401         unsigned int                    tailsz;
1402         struct cifs_credits             credits;
1403         unsigned int                    nr_pages;
1404         struct page                     **pages;
1405 };
1406
1407 struct cifs_writedata;
1408
1409 /* asynchronous write support */
1410 struct cifs_writedata {
1411         struct kref                     refcount;
1412         struct list_head                list;
1413         struct completion               done;
1414         enum writeback_sync_modes       sync_mode;
1415         struct work_struct              work;
1416         struct cifsFileInfo             *cfile;
1417         struct cifs_aio_ctx             *ctx;
1418         __u64                           offset;
1419         pid_t                           pid;
1420         unsigned int                    bytes;
1421         int                             result;
1422         struct TCP_Server_Info          *server;
1423 #ifdef CONFIG_CIFS_SMB_DIRECT
1424         struct smbd_mr                  *mr;
1425 #endif
1426         unsigned int                    pagesz;
1427         unsigned int                    page_offset;
1428         unsigned int                    tailsz;
1429         struct cifs_credits             credits;
1430         unsigned int                    nr_pages;
1431         struct page                     **pages;
1432 };
1433
1434 /*
1435  * Take a reference on the file private data. Must be called with
1436  * cfile->file_info_lock held.
1437  */
1438 static inline void
1439 cifsFileInfo_get_locked(struct cifsFileInfo *cifs_file)
1440 {
1441         ++cifs_file->count;
1442 }
1443
1444 struct cifsFileInfo *cifsFileInfo_get(struct cifsFileInfo *cifs_file);
1445 void _cifsFileInfo_put(struct cifsFileInfo *cifs_file, bool wait_oplock_hdlr,
1446                        bool offload);
1447 void cifsFileInfo_put(struct cifsFileInfo *cifs_file);
1448
1449 #define CIFS_CACHE_READ_FLG     1
1450 #define CIFS_CACHE_HANDLE_FLG   2
1451 #define CIFS_CACHE_RH_FLG       (CIFS_CACHE_READ_FLG | CIFS_CACHE_HANDLE_FLG)
1452 #define CIFS_CACHE_WRITE_FLG    4
1453 #define CIFS_CACHE_RW_FLG       (CIFS_CACHE_READ_FLG | CIFS_CACHE_WRITE_FLG)
1454 #define CIFS_CACHE_RHW_FLG      (CIFS_CACHE_RW_FLG | CIFS_CACHE_HANDLE_FLG)
1455
1456 #define CIFS_CACHE_READ(cinode) ((cinode->oplock & CIFS_CACHE_READ_FLG) || (CIFS_SB(cinode->vfs_inode.i_sb)->mnt_cifs_flags & CIFS_MOUNT_RO_CACHE))
1457 #define CIFS_CACHE_HANDLE(cinode) (cinode->oplock & CIFS_CACHE_HANDLE_FLG)
1458 #define CIFS_CACHE_WRITE(cinode) ((cinode->oplock & CIFS_CACHE_WRITE_FLG) || (CIFS_SB(cinode->vfs_inode.i_sb)->mnt_cifs_flags & CIFS_MOUNT_RW_CACHE))
1459
1460 /*
1461  * One of these for each file inode
1462  */
1463
1464 struct cifsInodeInfo {
1465         bool can_cache_brlcks;
1466         struct list_head llist; /* locks helb by this inode */
1467         /*
1468          * NOTE: Some code paths call down_read(lock_sem) twice, so
1469          * we must always use use cifs_down_write() instead of down_write()
1470          * for this semaphore to avoid deadlocks.
1471          */
1472         struct rw_semaphore lock_sem;   /* protect the fields above */
1473         /* BB add in lists for dirty pages i.e. write caching info for oplock */
1474         struct list_head openFileList;
1475         spinlock_t      open_file_lock; /* protects openFileList */
1476         __u32 cifsAttrs; /* e.g. DOS archive bit, sparse, compressed, system */
1477         unsigned int oplock;            /* oplock/lease level we have */
1478         unsigned int epoch;             /* used to track lease state changes */
1479 #define CIFS_INODE_PENDING_OPLOCK_BREAK   (0) /* oplock break in progress */
1480 #define CIFS_INODE_PENDING_WRITERS        (1) /* Writes in progress */
1481 #define CIFS_INODE_FLAG_UNUSED            (2) /* Unused flag */
1482 #define CIFS_INO_DELETE_PENDING           (3) /* delete pending on server */
1483 #define CIFS_INO_INVALID_MAPPING          (4) /* pagecache is invalid */
1484 #define CIFS_INO_LOCK                     (5) /* lock bit for synchronization */
1485         unsigned long flags;
1486         spinlock_t writers_lock;
1487         unsigned int writers;           /* Number of writers on this inode */
1488         unsigned long time;             /* jiffies of last update of inode */
1489         u64  server_eof;                /* current file size on server -- protected by i_lock */
1490         u64  uniqueid;                  /* server inode number */
1491         u64  createtime;                /* creation time on server */
1492         __u8 lease_key[SMB2_LEASE_KEY_SIZE];    /* lease key for this inode */
1493 #ifdef CONFIG_CIFS_FSCACHE
1494         struct fscache_cookie *fscache;
1495 #endif
1496         struct inode vfs_inode;
1497 };
1498
1499 static inline struct cifsInodeInfo *
1500 CIFS_I(struct inode *inode)
1501 {
1502         return container_of(inode, struct cifsInodeInfo, vfs_inode);
1503 }
1504
1505 static inline struct cifs_sb_info *
1506 CIFS_SB(struct super_block *sb)
1507 {
1508         return sb->s_fs_info;
1509 }
1510
1511 static inline struct cifs_sb_info *
1512 CIFS_FILE_SB(struct file *file)
1513 {
1514         return CIFS_SB(file_inode(file)->i_sb);
1515 }
1516
1517 static inline char CIFS_DIR_SEP(const struct cifs_sb_info *cifs_sb)
1518 {
1519         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_POSIX_PATHS)
1520                 return '/';
1521         else
1522                 return '\\';
1523 }
1524
1525 static inline void
1526 convert_delimiter(char *path, char delim)
1527 {
1528         char old_delim, *pos;
1529
1530         if (delim == '/')
1531                 old_delim = '\\';
1532         else
1533                 old_delim = '/';
1534
1535         pos = path;
1536         while ((pos = strchr(pos, old_delim)))
1537                 *pos = delim;
1538 }
1539
1540 #define cifs_stats_inc atomic_inc
1541
1542 static inline void cifs_stats_bytes_written(struct cifs_tcon *tcon,
1543                                             unsigned int bytes)
1544 {
1545         if (bytes) {
1546                 spin_lock(&tcon->stat_lock);
1547                 tcon->bytes_written += bytes;
1548                 spin_unlock(&tcon->stat_lock);
1549         }
1550 }
1551
1552 static inline void cifs_stats_bytes_read(struct cifs_tcon *tcon,
1553                                          unsigned int bytes)
1554 {
1555         spin_lock(&tcon->stat_lock);
1556         tcon->bytes_read += bytes;
1557         spin_unlock(&tcon->stat_lock);
1558 }
1559
1560
1561 /*
1562  * This is the prototype for the mid receive function. This function is for
1563  * receiving the rest of the SMB frame, starting with the WordCount (which is
1564  * just after the MID in struct smb_hdr). Note:
1565  *
1566  * - This will be called by cifsd, with no locks held.
1567  * - The mid will still be on the pending_mid_q.
1568  * - mid->resp_buf will point to the current buffer.
1569  *
1570  * Returns zero on a successful receive, or an error. The receive state in
1571  * the TCP_Server_Info will also be updated.
1572  */
1573 typedef int (mid_receive_t)(struct TCP_Server_Info *server,
1574                             struct mid_q_entry *mid);
1575
1576 /*
1577  * This is the prototype for the mid callback function. This is called once the
1578  * mid has been received off of the socket. When creating one, take special
1579  * care to avoid deadlocks. Things to bear in mind:
1580  *
1581  * - it will be called by cifsd, with no locks held
1582  * - the mid will be removed from any lists
1583  */
1584 typedef void (mid_callback_t)(struct mid_q_entry *mid);
1585
1586 /*
1587  * This is the protopyte for mid handle function. This is called once the mid
1588  * has been recognized after decryption of the message.
1589  */
1590 typedef int (mid_handle_t)(struct TCP_Server_Info *server,
1591                             struct mid_q_entry *mid);
1592
1593 /* one of these for every pending CIFS request to the server */
1594 struct mid_q_entry {
1595         struct list_head qhead; /* mids waiting on reply from this server */
1596         struct kref refcount;
1597         struct TCP_Server_Info *server; /* server corresponding to this mid */
1598         __u64 mid;              /* multiplex id */
1599         __u16 credits;          /* number of credits consumed by this mid */
1600         __u16 credits_received; /* number of credits from the response */
1601         __u32 pid;              /* process id */
1602         __u32 sequence_number;  /* for CIFS signing */
1603         unsigned long when_alloc;  /* when mid was created */
1604 #ifdef CONFIG_CIFS_STATS2
1605         unsigned long when_sent; /* time when smb send finished */
1606         unsigned long when_received; /* when demux complete (taken off wire) */
1607 #endif
1608         mid_receive_t *receive; /* call receive callback */
1609         mid_callback_t *callback; /* call completion callback */
1610         mid_handle_t *handle; /* call handle mid callback */
1611         void *callback_data;      /* general purpose pointer for callback */
1612         struct task_struct *creator;
1613         void *resp_buf;         /* pointer to received SMB header */
1614         unsigned int resp_buf_size;
1615         int mid_state;  /* wish this were enum but can not pass to wait_event */
1616         unsigned int mid_flags;
1617         __le16 command;         /* smb command code */
1618         unsigned int optype;    /* operation type */
1619         bool large_buf:1;       /* if valid response, is pointer to large buf */
1620         bool multiRsp:1;        /* multiple trans2 responses for one request  */
1621         bool multiEnd:1;        /* both received */
1622         bool decrypted:1;       /* decrypted entry */
1623 };
1624
1625 struct close_cancelled_open {
1626         struct cifs_fid         fid;
1627         struct cifs_tcon        *tcon;
1628         struct work_struct      work;
1629         __u64 mid;
1630         __u16 cmd;
1631 };
1632
1633 /*      Make code in transport.c a little cleaner by moving
1634         update of optional stats into function below */
1635 static inline void cifs_in_send_inc(struct TCP_Server_Info *server)
1636 {
1637         atomic_inc(&server->in_send);
1638 }
1639
1640 static inline void cifs_in_send_dec(struct TCP_Server_Info *server)
1641 {
1642         atomic_dec(&server->in_send);
1643 }
1644
1645 static inline void cifs_num_waiters_inc(struct TCP_Server_Info *server)
1646 {
1647         atomic_inc(&server->num_waiters);
1648 }
1649
1650 static inline void cifs_num_waiters_dec(struct TCP_Server_Info *server)
1651 {
1652         atomic_dec(&server->num_waiters);
1653 }
1654
1655 #ifdef CONFIG_CIFS_STATS2
1656 static inline void cifs_save_when_sent(struct mid_q_entry *mid)
1657 {
1658         mid->when_sent = jiffies;
1659 }
1660 #else
1661 static inline void cifs_save_when_sent(struct mid_q_entry *mid)
1662 {
1663 }
1664 #endif
1665
1666 /* for pending dnotify requests */
1667 struct dir_notify_req {
1668         struct list_head lhead;
1669         __le16 Pid;
1670         __le16 PidHigh;
1671         __u16 Mid;
1672         __u16 Tid;
1673         __u16 Uid;
1674         __u16 netfid;
1675         __u32 filter; /* CompletionFilter (for multishot) */
1676         int multishot;
1677         struct file *pfile;
1678 };
1679
1680 struct dfs_info3_param {
1681         int flags; /* DFSREF_REFERRAL_SERVER, DFSREF_STORAGE_SERVER*/
1682         int path_consumed;
1683         int server_type;
1684         int ref_flag;
1685         char *path_name;
1686         char *node_name;
1687         int ttl;
1688 };
1689
1690 /*
1691  * common struct for holding inode info when searching for or updating an
1692  * inode with new info
1693  */
1694
1695 #define CIFS_FATTR_DFS_REFERRAL         0x1
1696 #define CIFS_FATTR_DELETE_PENDING       0x2
1697 #define CIFS_FATTR_NEED_REVAL           0x4
1698 #define CIFS_FATTR_INO_COLLISION        0x8
1699 #define CIFS_FATTR_UNKNOWN_NLINK        0x10
1700 #define CIFS_FATTR_FAKE_ROOT_INO        0x20
1701
1702 struct cifs_fattr {
1703         u32             cf_flags;
1704         u32             cf_cifsattrs;
1705         u64             cf_uniqueid;
1706         u64             cf_eof;
1707         u64             cf_bytes;
1708         u64             cf_createtime;
1709         kuid_t          cf_uid;
1710         kgid_t          cf_gid;
1711         umode_t         cf_mode;
1712         dev_t           cf_rdev;
1713         unsigned int    cf_nlink;
1714         unsigned int    cf_dtype;
1715         struct timespec64 cf_atime;
1716         struct timespec64 cf_mtime;
1717         struct timespec64 cf_ctime;
1718         u32             cf_cifstag;
1719 };
1720
1721 static inline void free_dfs_info_param(struct dfs_info3_param *param)
1722 {
1723         if (param) {
1724                 kfree(param->path_name);
1725                 kfree(param->node_name);
1726         }
1727 }
1728
1729 static inline void free_dfs_info_array(struct dfs_info3_param *param,
1730                                        int number_of_items)
1731 {
1732         int i;
1733         if ((number_of_items == 0) || (param == NULL))
1734                 return;
1735         for (i = 0; i < number_of_items; i++) {
1736                 kfree(param[i].path_name);
1737                 kfree(param[i].node_name);
1738         }
1739         kfree(param);
1740 }
1741
1742 static inline bool is_interrupt_error(int error)
1743 {
1744         switch (error) {
1745         case -EINTR:
1746         case -ERESTARTSYS:
1747         case -ERESTARTNOHAND:
1748         case -ERESTARTNOINTR:
1749                 return true;
1750         }
1751         return false;
1752 }
1753
1754 static inline bool is_retryable_error(int error)
1755 {
1756         if (is_interrupt_error(error) || error == -EAGAIN)
1757                 return true;
1758         return false;
1759 }
1760
1761
1762 /* cifs_get_writable_file() flags */
1763 #define FIND_WR_ANY         0
1764 #define FIND_WR_FSUID_ONLY  1
1765 #define FIND_WR_WITH_DELETE 2
1766
1767 #define   MID_FREE 0
1768 #define   MID_REQUEST_ALLOCATED 1
1769 #define   MID_REQUEST_SUBMITTED 2
1770 #define   MID_RESPONSE_RECEIVED 4
1771 #define   MID_RETRY_NEEDED      8 /* session closed while this request out */
1772 #define   MID_RESPONSE_MALFORMED 0x10
1773 #define   MID_SHUTDOWN           0x20
1774
1775 /* Flags */
1776 #define   MID_WAIT_CANCELLED     1 /* Cancelled while waiting for response */
1777 #define   MID_DELETED            2 /* Mid has been dequeued/deleted */
1778
1779 /* Types of response buffer returned from SendReceive2 */
1780 #define   CIFS_NO_BUFFER        0    /* Response buffer not returned */
1781 #define   CIFS_SMALL_BUFFER     1
1782 #define   CIFS_LARGE_BUFFER     2
1783 #define   CIFS_IOVEC            4    /* array of response buffers */
1784
1785 /* Type of Request to SendReceive2 */
1786 #define   CIFS_BLOCKING_OP      1    /* operation can block */
1787 #define   CIFS_NON_BLOCKING     2    /* do not block waiting for credits */
1788 #define   CIFS_TIMEOUT_MASK 0x003    /* only one of above set in req */
1789 #define   CIFS_LOG_ERROR    0x010    /* log NT STATUS if non-zero */
1790 #define   CIFS_LARGE_BUF_OP 0x020    /* large request buffer */
1791 #define   CIFS_NO_RSP_BUF   0x040    /* no response buffer required */
1792
1793 /* Type of request operation */
1794 #define   CIFS_ECHO_OP      0x080    /* echo request */
1795 #define   CIFS_OBREAK_OP   0x0100    /* oplock break request */
1796 #define   CIFS_NEG_OP      0x0200    /* negotiate request */
1797 #define   CIFS_OP_MASK     0x0380    /* mask request type */
1798
1799 #define   CIFS_HAS_CREDITS 0x0400    /* already has credits */
1800 #define   CIFS_TRANSFORM_REQ 0x0800    /* transform request before sending */
1801 #define   CIFS_NO_SRV_RSP    0x1000    /* there is no server response */
1802
1803 /* Security Flags: indicate type of session setup needed */
1804 #define   CIFSSEC_MAY_SIGN      0x00001
1805 #define   CIFSSEC_MAY_NTLM      0x00002
1806 #define   CIFSSEC_MAY_NTLMV2    0x00004
1807 #define   CIFSSEC_MAY_KRB5      0x00008
1808 #ifdef CONFIG_CIFS_WEAK_PW_HASH
1809 #define   CIFSSEC_MAY_LANMAN    0x00010
1810 #define   CIFSSEC_MAY_PLNTXT    0x00020
1811 #else
1812 #define   CIFSSEC_MAY_LANMAN    0
1813 #define   CIFSSEC_MAY_PLNTXT    0
1814 #endif /* weak passwords */
1815 #define   CIFSSEC_MAY_SEAL      0x00040 /* not supported yet */
1816 #define   CIFSSEC_MAY_NTLMSSP   0x00080 /* raw ntlmssp with ntlmv2 */
1817
1818 #define   CIFSSEC_MUST_SIGN     0x01001
1819 /* note that only one of the following can be set so the
1820 result of setting MUST flags more than once will be to
1821 require use of the stronger protocol */
1822 #define   CIFSSEC_MUST_NTLM     0x02002
1823 #define   CIFSSEC_MUST_NTLMV2   0x04004
1824 #define   CIFSSEC_MUST_KRB5     0x08008
1825 #ifdef CONFIG_CIFS_WEAK_PW_HASH
1826 #define   CIFSSEC_MUST_LANMAN   0x10010
1827 #define   CIFSSEC_MUST_PLNTXT   0x20020
1828 #ifdef CONFIG_CIFS_UPCALL
1829 #define   CIFSSEC_MASK          0xBF0BF /* allows weak security but also krb5 */
1830 #else
1831 #define   CIFSSEC_MASK          0xB70B7 /* current flags supported if weak */
1832 #endif /* UPCALL */
1833 #else /* do not allow weak pw hash */
1834 #define   CIFSSEC_MUST_LANMAN   0
1835 #define   CIFSSEC_MUST_PLNTXT   0
1836 #ifdef CONFIG_CIFS_UPCALL
1837 #define   CIFSSEC_MASK          0x8F08F /* flags supported if no weak allowed */
1838 #else
1839 #define   CIFSSEC_MASK          0x87087 /* flags supported if no weak allowed */
1840 #endif /* UPCALL */
1841 #endif /* WEAK_PW_HASH */
1842 #define   CIFSSEC_MUST_SEAL     0x40040 /* not supported yet */
1843 #define   CIFSSEC_MUST_NTLMSSP  0x80080 /* raw ntlmssp with ntlmv2 */
1844
1845 #define   CIFSSEC_DEF (CIFSSEC_MAY_SIGN | CIFSSEC_MAY_NTLMV2 | CIFSSEC_MAY_NTLMSSP)
1846 #define   CIFSSEC_MAX (CIFSSEC_MUST_SIGN | CIFSSEC_MUST_NTLMV2)
1847 #define   CIFSSEC_AUTH_MASK (CIFSSEC_MAY_NTLM | CIFSSEC_MAY_NTLMV2 | CIFSSEC_MAY_LANMAN | CIFSSEC_MAY_PLNTXT | CIFSSEC_MAY_KRB5 | CIFSSEC_MAY_NTLMSSP)
1848 /*
1849  *****************************************************************
1850  * All constants go here
1851  *****************************************************************
1852  */
1853
1854 #define UID_HASH (16)
1855
1856 /*
1857  * Note that ONE module should define _DECLARE_GLOBALS_HERE to cause the
1858  * following to be declared.
1859  */
1860
1861 /****************************************************************************
1862  *  Locking notes.  All updates to global variables and lists should be
1863  *                  protected by spinlocks or semaphores.
1864  *
1865  *  Spinlocks
1866  *  ---------
1867  *  GlobalMid_Lock protects:
1868  *      list operations on pending_mid_q and oplockQ
1869  *      updates to XID counters, multiplex id  and SMB sequence numbers
1870  *      list operations on global DnotifyReqList
1871  *  tcp_ses_lock protects:
1872  *      list operations on tcp and SMB session lists
1873  *  tcon->open_file_lock protects the list of open files hanging off the tcon
1874  *  inode->open_file_lock protects the openFileList hanging off the inode
1875  *  cfile->file_info_lock protects counters and fields in cifs file struct
1876  *  f_owner.lock protects certain per file struct operations
1877  *  mapping->page_lock protects certain per page operations
1878  *
1879  *  Note that the cifs_tcon.open_file_lock should be taken before
1880  *  not after the cifsInodeInfo.open_file_lock
1881  *
1882  *  Semaphores
1883  *  ----------
1884  *  sesSem     operations on smb session
1885  *  tconSem    operations on tree connection
1886  *  fh_sem      file handle reconnection operations
1887  *
1888  ****************************************************************************/
1889
1890 #ifdef DECLARE_GLOBALS_HERE
1891 #define GLOBAL_EXTERN
1892 #else
1893 #define GLOBAL_EXTERN extern
1894 #endif
1895
1896 /*
1897  * the list of TCP_Server_Info structures, ie each of the sockets
1898  * connecting our client to a distinct server (ip address), is
1899  * chained together by cifs_tcp_ses_list. The list of all our SMB
1900  * sessions (and from that the tree connections) can be found
1901  * by iterating over cifs_tcp_ses_list
1902  */
1903 GLOBAL_EXTERN struct list_head          cifs_tcp_ses_list;
1904
1905 /*
1906  * This lock protects the cifs_tcp_ses_list, the list of smb sessions per
1907  * tcp session, and the list of tcon's per smb session. It also protects
1908  * the reference counters for the server, smb session, and tcon. It also
1909  * protects some fields in the TCP_Server_Info struct such as dstaddr. Finally,
1910  * changes to the tcon->tidStatus should be done while holding this lock.
1911  * generally the locks should be taken in order tcp_ses_lock before
1912  * tcon->open_file_lock and that before file->file_info_lock since the
1913  * structure order is cifs_socket-->cifs_ses-->cifs_tcon-->cifs_file
1914  */
1915 GLOBAL_EXTERN spinlock_t                cifs_tcp_ses_lock;
1916
1917 #ifdef CONFIG_CIFS_DNOTIFY_EXPERIMENTAL /* unused temporarily */
1918 /* Outstanding dir notify requests */
1919 GLOBAL_EXTERN struct list_head GlobalDnotifyReqList;
1920 /* DirNotify response queue */
1921 GLOBAL_EXTERN struct list_head GlobalDnotifyRsp_Q;
1922 #endif /* was needed for dnotify, and will be needed for inotify when VFS fix */
1923
1924 /*
1925  * Global transaction id (XID) information
1926  */
1927 GLOBAL_EXTERN unsigned int GlobalCurrentXid;    /* protected by GlobalMid_Sem */
1928 GLOBAL_EXTERN unsigned int GlobalTotalActiveXid; /* prot by GlobalMid_Sem */
1929 GLOBAL_EXTERN unsigned int GlobalMaxActiveXid;  /* prot by GlobalMid_Sem */
1930 GLOBAL_EXTERN spinlock_t GlobalMid_Lock;  /* protects above & list operations */
1931                                           /* on midQ entries */
1932 /*
1933  *  Global counters, updated atomically
1934  */
1935 GLOBAL_EXTERN atomic_t sesInfoAllocCount;
1936 GLOBAL_EXTERN atomic_t tconInfoAllocCount;
1937 GLOBAL_EXTERN atomic_t tcpSesAllocCount;
1938 GLOBAL_EXTERN atomic_t tcpSesReconnectCount;
1939 GLOBAL_EXTERN atomic_t tconInfoReconnectCount;
1940
1941 /* Various Debug counters */
1942 GLOBAL_EXTERN atomic_t bufAllocCount;    /* current number allocated  */
1943 #ifdef CONFIG_CIFS_STATS2
1944 GLOBAL_EXTERN atomic_t totBufAllocCount; /* total allocated over all time */
1945 GLOBAL_EXTERN atomic_t totSmBufAllocCount;
1946 extern unsigned int slow_rsp_threshold; /* number of secs before logging */
1947 #endif
1948 GLOBAL_EXTERN atomic_t smBufAllocCount;
1949 GLOBAL_EXTERN atomic_t midCount;
1950
1951 /* Misc globals */
1952 extern bool enable_oplocks; /* enable or disable oplocks */
1953 extern bool lookupCacheEnabled;
1954 extern unsigned int global_secflags;    /* if on, session setup sent
1955                                 with more secure ntlmssp2 challenge/resp */
1956 extern unsigned int sign_CIFS_PDUs;  /* enable smb packet signing */
1957 extern bool linuxExtEnabled;/*enable Linux/Unix CIFS extensions*/
1958 extern unsigned int CIFSMaxBufSize;  /* max size not including hdr */
1959 extern unsigned int cifs_min_rcv;    /* min size of big ntwrk buf pool */
1960 extern unsigned int cifs_min_small;  /* min size of small buf pool */
1961 extern unsigned int cifs_max_pending; /* MAX requests at once to server*/
1962 extern bool disable_legacy_dialects;  /* forbid vers=1.0 and vers=2.0 mounts */
1963
1964 GLOBAL_EXTERN struct rb_root uidtree;
1965 GLOBAL_EXTERN struct rb_root gidtree;
1966 GLOBAL_EXTERN spinlock_t siduidlock;
1967 GLOBAL_EXTERN spinlock_t sidgidlock;
1968 GLOBAL_EXTERN struct rb_root siduidtree;
1969 GLOBAL_EXTERN struct rb_root sidgidtree;
1970 GLOBAL_EXTERN spinlock_t uidsidlock;
1971 GLOBAL_EXTERN spinlock_t gidsidlock;
1972
1973 void cifs_oplock_break(struct work_struct *work);
1974 void cifs_queue_oplock_break(struct cifsFileInfo *cfile);
1975
1976 extern const struct slow_work_ops cifs_oplock_break_ops;
1977 extern struct workqueue_struct *cifsiod_wq;
1978 extern struct workqueue_struct *decrypt_wq;
1979 extern struct workqueue_struct *fileinfo_put_wq;
1980 extern struct workqueue_struct *cifsoplockd_wq;
1981 extern __u32 cifs_lock_secret;
1982
1983 extern mempool_t *cifs_mid_poolp;
1984
1985 /* Operations for different SMB versions */
1986 #define SMB1_VERSION_STRING     "1.0"
1987 extern struct smb_version_operations smb1_operations;
1988 extern struct smb_version_values smb1_values;
1989 #define SMB20_VERSION_STRING    "2.0"
1990 extern struct smb_version_operations smb20_operations;
1991 extern struct smb_version_values smb20_values;
1992 #define SMB21_VERSION_STRING    "2.1"
1993 extern struct smb_version_operations smb21_operations;
1994 extern struct smb_version_values smb21_values;
1995 #define SMBDEFAULT_VERSION_STRING "default"
1996 extern struct smb_version_values smbdefault_values;
1997 #define SMB3ANY_VERSION_STRING "3"
1998 extern struct smb_version_values smb3any_values;
1999 #define SMB30_VERSION_STRING    "3.0"
2000 extern struct smb_version_operations smb30_operations;
2001 extern struct smb_version_values smb30_values;
2002 #define SMB302_VERSION_STRING   "3.02"
2003 #define ALT_SMB302_VERSION_STRING "3.0.2"
2004 /*extern struct smb_version_operations smb302_operations;*/ /* not needed yet */
2005 extern struct smb_version_values smb302_values;
2006 #define SMB311_VERSION_STRING   "3.1.1"
2007 #define ALT_SMB311_VERSION_STRING "3.11"
2008 extern struct smb_version_operations smb311_operations;
2009 extern struct smb_version_values smb311_values;
2010
2011 static inline char *get_security_type_str(enum securityEnum sectype)
2012 {
2013         switch (sectype) {
2014         case RawNTLMSSP:
2015                 return "RawNTLMSSP";
2016         case Kerberos:
2017                 return "Kerberos";
2018         case NTLMv2:
2019                 return "NTLMv2";
2020         case NTLM:
2021                 return "NTLM";
2022         case LANMAN:
2023                 return "LANMAN";
2024         default:
2025                 return "Unknown";
2026         }
2027 }
2028
2029 static inline bool is_smb1_server(struct TCP_Server_Info *server)
2030 {
2031         return strcmp(server->vals->version_string, SMB1_VERSION_STRING) == 0;
2032 }
2033
2034 #endif  /* _CIFS_GLOB_H */