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 #ifdef CONFIG_CIFS_SMB2
  33 #include "smb2pdu.h"
  34 #endif
  35
  36 #define CIFS_MAGIC_NUMBER 0xFF534D42      /* the first four bytes of SMB PDUs */
  37
  38 /*
  39  * The sizes of various internal tables and strings
  40  */
  41 #define MAX_UID_INFO 16
  42 #define MAX_SES_INFO 2
  43 #define MAX_TCON_INFO 4
  44
  45 #define MAX_TREE_SIZE (2 + CIFS_NI_MAXHOST + 1 + CIFS_MAX_SHARE_LEN + 1)
  46
  47 #define CIFS_MIN_RCV_POOL 4
  48
  49 #define MAX_REOPEN_ATT  5 /* these many maximum attempts to reopen a file */
  50 /*
  51  * default attribute cache timeout (jiffies)
  52  */
  53 #define CIFS_DEF_ACTIMEO (1 * HZ)
  54
  55 /*
  56  * max attribute cache timeout (jiffies) - 2^30
  57  */
  58 #define CIFS_MAX_ACTIMEO (1 << 30)
  59
  60 /*
  61  * MAX_REQ is the maximum number of requests that WE will send
  62  * on one socket concurrently.
  63  */
  64 #define CIFS_MAX_REQ 32767
  65
  66 #define RFC1001_NAME_LEN 15
  67 #define RFC1001_NAME_LEN_WITH_NULL (RFC1001_NAME_LEN + 1)
  68
  69 /* currently length of NIP6_FMT */
  70 #define SERVER_NAME_LENGTH 40
  71 #define SERVER_NAME_LEN_WITH_NULL     (SERVER_NAME_LENGTH + 1)
  72
  73 /* used to define string lengths for reversing unicode strings */
  74 /*         (256+1)*2 = 514                                     */
  75 /*           (max path length + 1 for null) * 2 for unicode    */
  76 #define MAX_NAME 514
  77
  78 /* SMB echo "timeout" -- FIXME: tunable? */
  79 #define SMB_ECHO_INTERVAL (60 * HZ)
  80
  81 #include "cifspdu.h"
  82
  83 #ifndef XATTR_DOS_ATTRIB
  84 #define XATTR_DOS_ATTRIB "user.DOSATTRIB"
  85 #endif
  86
  87 /*
  88  * CIFS vfs client Status information (based on what we know.)
  89  */
  90
  91 /* associated with each tcp and smb session */
  92 enum statusEnum {
  93         CifsNew = 0,
  94         CifsGood,
  95         CifsExiting,
  96         CifsNeedReconnect,
  97         CifsNeedNegotiate
  98 };
  99
 100 enum securityEnum {
 101         Unspecified = 0,        /* not specified */
 102         LANMAN,                 /* Legacy LANMAN auth */
 103         NTLM,                   /* Legacy NTLM012 auth with NTLM hash */
 104         NTLMv2,                 /* Legacy NTLM auth with NTLMv2 hash */
 105         RawNTLMSSP,             /* NTLMSSP without SPNEGO, NTLMv2 hash */
 106         Kerberos,               /* Kerberos via SPNEGO */
 107 };
 108
 109 struct session_key {
 110         unsigned int len;
 111         char *response;
 112 };
 113
 114 /* crypto security descriptor definition */
 115 struct sdesc {
 116         struct shash_desc shash;
 117         char ctx[];
 118 };
 119
 120 /* crypto hashing related structure/fields, not specific to a sec mech */
 121 struct cifs_secmech {
 122         struct crypto_shash *hmacmd5; /* hmac-md5 hash function */
 123         struct crypto_shash *md5; /* md5 hash function */
 124         struct crypto_shash *hmacsha256; /* hmac-sha256 hash function */
 125         struct crypto_shash *cmacaes; /* block-cipher based MAC function */
 126         struct sdesc *sdeschmacmd5;  /* ctxt to generate ntlmv2 hash, CR1 */
 127         struct sdesc *sdescmd5; /* ctxt to generate cifs/smb signature */
 128         struct sdesc *sdeschmacsha256;  /* ctxt to generate smb2 signature */
 129         struct sdesc *sdesccmacaes;  /* ctxt to generate smb3 signature */
 130 };
 131
 132 /* per smb session structure/fields */
 133 struct ntlmssp_auth {
 134         bool sesskey_per_smbsess; /* whether session key is per smb session */
 135         __u32 client_flags; /* sent by client in type 1 ntlmsssp exchange */
 136         __u32 server_flags; /* sent by server in type 2 ntlmssp exchange */
 137         unsigned char ciphertext[CIFS_CPHTXT_SIZE]; /* sent to server */
 138         char cryptkey[CIFS_CRYPTO_KEY_SIZE]; /* used by ntlmssp */
 139 };
 140
 141 struct cifs_cred {
 142         int uid;
 143         int gid;
 144         int mode;
 145         int cecount;
 146         struct cifs_sid osid;
 147         struct cifs_sid gsid;
 148         struct cifs_ntace *ntaces;
 149         struct cifs_ace *aces;
 150 };
 151
 152 /*
 153  *****************************************************************
 154  * Except the CIFS PDUs themselves all the
 155  * globally interesting structs should go here
 156  *****************************************************************
 157  */
 158
 159 /*
 160  * A smb_rqst represents a complete request to be issued to a server. It's
 161  * formed by a kvec array, followed by an array of pages. Page data is assumed
 162  * to start at the beginning of the first page.
 163  */
 164 struct smb_rqst {
 165         struct kvec     *rq_iov;        /* array of kvecs */
 166         unsigned int    rq_nvec;        /* number of kvecs in array */
 167         struct page     **rq_pages;     /* pointer to array of page ptrs */
 168         unsigned int    rq_npages;      /* number pages in array */
 169         unsigned int    rq_pagesz;      /* page size to use */
 170         unsigned int    rq_tailsz;      /* length of last page */
 171 };
 172
 173 enum smb_version {
 174         Smb_1 = 1,
 175         Smb_20,
 176         Smb_21,
 177         Smb_30,
 178         Smb_302,
 179 };
 180
 181 struct mid_q_entry;
 182 struct TCP_Server_Info;
 183 struct cifsFileInfo;
 184 struct cifs_ses;
 185 struct cifs_tcon;
 186 struct dfs_info3_param;
 187 struct cifs_fattr;
 188 struct smb_vol;
 189 struct cifs_fid;
 190 struct cifs_readdata;
 191 struct cifs_writedata;
 192 struct cifs_io_parms;
 193 struct cifs_search_info;
 194 struct cifsInodeInfo;
 195 struct cifs_open_parms;
 196
 197 struct smb_version_operations {
 198         int (*send_cancel)(struct TCP_Server_Info *, void *,
 199                            struct mid_q_entry *);
 200         bool (*compare_fids)(struct cifsFileInfo *, struct cifsFileInfo *);
 201         /* setup request: allocate mid, sign message */
 202         struct mid_q_entry *(*setup_request)(struct cifs_ses *,
 203                                                 struct smb_rqst *);
 204         /* setup async request: allocate mid, sign message */
 205         struct mid_q_entry *(*setup_async_request)(struct TCP_Server_Info *,
 206                                                 struct smb_rqst *);
 207         /* check response: verify signature, map error */
 208         int (*check_receive)(struct mid_q_entry *, struct TCP_Server_Info *,
 209                              bool);
 210         void (*add_credits)(struct TCP_Server_Info *, const unsigned int,
 211                             const int);
 212         void (*set_credits)(struct TCP_Server_Info *, const int);
 213         int * (*get_credits_field)(struct TCP_Server_Info *, const int);
 214         unsigned int (*get_credits)(struct mid_q_entry *);
 215         __u64 (*get_next_mid)(struct TCP_Server_Info *);
 216         /* data offset from read response message */
 217         unsigned int (*read_data_offset)(char *);
 218         /* data length from read response message */
 219         unsigned int (*read_data_length)(char *);
 220         /* map smb to linux error */
 221         int (*map_error)(char *, bool);
 222         /* find mid corresponding to the response message */
 223         struct mid_q_entry * (*find_mid)(struct TCP_Server_Info *, char *);
 224         void (*dump_detail)(void *);
 225         void (*clear_stats)(struct cifs_tcon *);
 226         void (*print_stats)(struct seq_file *m, struct cifs_tcon *);
 227         void (*dump_share_caps)(struct seq_file *, struct cifs_tcon *);
 228         /* verify the message */
 229         int (*check_message)(char *, unsigned int);
 230         bool (*is_oplock_break)(char *, struct TCP_Server_Info *);
 231         /* process transaction2 response */
 232         bool (*check_trans2)(struct mid_q_entry *, struct TCP_Server_Info *,
 233                              char *, int);
 234         /* check if we need to negotiate */
 235         bool (*need_neg)(struct TCP_Server_Info *);
 236         /* negotiate to the server */
 237         int (*negotiate)(const unsigned int, struct cifs_ses *);
 238         /* set negotiated write size */
 239         unsigned int (*negotiate_wsize)(struct cifs_tcon *, struct smb_vol *);
 240         /* set negotiated read size */
 241         unsigned int (*negotiate_rsize)(struct cifs_tcon *, struct smb_vol *);
 242         /* setup smb sessionn */
 243         int (*sess_setup)(const unsigned int, struct cifs_ses *,
 244                           const struct nls_table *);
 245         /* close smb session */
 246         int (*logoff)(const unsigned int, struct cifs_ses *);
 247         /* connect to a server share */
 248         int (*tree_connect)(const unsigned int, struct cifs_ses *, const char *,
 249                             struct cifs_tcon *, const struct nls_table *);
 250         /* close tree connecion */
 251         int (*tree_disconnect)(const unsigned int, struct cifs_tcon *);
 252         /* get DFS referrals */
 253         int (*get_dfs_refer)(const unsigned int, struct cifs_ses *,
 254                              const char *, struct dfs_info3_param **,
 255                              unsigned int *, const struct nls_table *, int);
 256         /* informational QFS call */
 257         void (*qfs_tcon)(const unsigned int, struct cifs_tcon *);
 258         /* check if a path is accessible or not */
 259         int (*is_path_accessible)(const unsigned int, struct cifs_tcon *,
 260                                   struct cifs_sb_info *, const char *);
 261         /* query path data from the server */
 262         int (*query_path_info)(const unsigned int, struct cifs_tcon *,
 263                                struct cifs_sb_info *, const char *,
 264                                FILE_ALL_INFO *, bool *);
 265         /* query file data from the server */
 266         int (*query_file_info)(const unsigned int, struct cifs_tcon *,
 267                                struct cifs_fid *, FILE_ALL_INFO *);
 268         /* get server index number */
 269         int (*get_srv_inum)(const unsigned int, struct cifs_tcon *,
 270                             struct cifs_sb_info *, const char *,
 271                             u64 *uniqueid, FILE_ALL_INFO *);
 272         /* set size by path */
 273         int (*set_path_size)(const unsigned int, struct cifs_tcon *,
 274                              const char *, __u64, struct cifs_sb_info *, bool);
 275         /* set size by file handle */
 276         int (*set_file_size)(const unsigned int, struct cifs_tcon *,
 277                              struct cifsFileInfo *, __u64, bool);
 278         /* set attributes */
 279         int (*set_file_info)(struct inode *, const char *, FILE_BASIC_INFO *,
 280                              const unsigned int);
 281         /* check if we can send an echo or nor */
 282         bool (*can_echo)(struct TCP_Server_Info *);
 283         /* send echo request */
 284         int (*echo)(struct TCP_Server_Info *);
 285         /* create directory */
 286         int (*mkdir)(const unsigned int, struct cifs_tcon *, const char *,
 287                      struct cifs_sb_info *);
 288         /* set info on created directory */
 289         void (*mkdir_setinfo)(struct inode *, const char *,
 290                               struct cifs_sb_info *, struct cifs_tcon *,
 291                               const unsigned int);
 292         /* remove directory */
 293         int (*rmdir)(const unsigned int, struct cifs_tcon *, const char *,
 294                      struct cifs_sb_info *);
 295         /* unlink file */
 296         int (*unlink)(const unsigned int, struct cifs_tcon *, const char *,
 297                       struct cifs_sb_info *);
 298         /* open, rename and delete file */
 299         int (*rename_pending_delete)(const char *, struct dentry *,
 300                                      const unsigned int);
 301         /* send rename request */
 302         int (*rename)(const unsigned int, struct cifs_tcon *, const char *,
 303                       const char *, struct cifs_sb_info *);
 304         /* send create hardlink request */
 305         int (*create_hardlink)(const unsigned int, struct cifs_tcon *,
 306                                const char *, const char *,
 307                                struct cifs_sb_info *);
 308         /* query symlink target */
 309         int (*query_symlink)(const unsigned int, struct cifs_tcon *,
 310                              const char *, char **, struct cifs_sb_info *);
 311         /* open a file for non-posix mounts */
 312         int (*open)(const unsigned int, struct cifs_open_parms *,
 313                     __u32 *, FILE_ALL_INFO *);
 314         /* set fid protocol-specific info */
 315         void (*set_fid)(struct cifsFileInfo *, struct cifs_fid *, __u32);
 316         /* close a file */
 317         void (*close)(const unsigned int, struct cifs_tcon *,
 318                       struct cifs_fid *);
 319         /* send a flush request to the server */
 320         int (*flush)(const unsigned int, struct cifs_tcon *, struct cifs_fid *);
 321         /* async read from the server */
 322         int (*async_readv)(struct cifs_readdata *);
 323         /* async write to the server */
 324         int (*async_writev)(struct cifs_writedata *);
 325         /* sync read from the server */
 326         int (*sync_read)(const unsigned int, struct cifsFileInfo *,
 327                          struct cifs_io_parms *, unsigned int *, char **,
 328                          int *);
 329         /* sync write to the server */
 330         int (*sync_write)(const unsigned int, struct cifsFileInfo *,
 331                           struct cifs_io_parms *, unsigned int *, struct kvec *,
 332                           unsigned long);
 333         /* open dir, start readdir */
 334         int (*query_dir_first)(const unsigned int, struct cifs_tcon *,
 335                                const char *, struct cifs_sb_info *,
 336                                struct cifs_fid *, __u16,
 337                                struct cifs_search_info *);
 338         /* continue readdir */
 339         int (*query_dir_next)(const unsigned int, struct cifs_tcon *,
 340                               struct cifs_fid *,
 341                               __u16, struct cifs_search_info *srch_inf);
 342         /* close dir */
 343         int (*close_dir)(const unsigned int, struct cifs_tcon *,
 344                          struct cifs_fid *);
 345         /* calculate a size of SMB message */
 346         unsigned int (*calc_smb_size)(void *);
 347         /* check for STATUS_PENDING and process it in a positive case */
 348         bool (*is_status_pending)(char *, struct TCP_Server_Info *, int);
 349         /* send oplock break response */
 350         int (*oplock_response)(struct cifs_tcon *, struct cifs_fid *,
 351                                struct cifsInodeInfo *);
 352         /* query remote filesystem */
 353         int (*queryfs)(const unsigned int, struct cifs_tcon *,
 354                        struct kstatfs *);
 355         /* send mandatory brlock to the server */
 356         int (*mand_lock)(const unsigned int, struct cifsFileInfo *, __u64,
 357                          __u64, __u32, int, int, bool);
 358         /* unlock range of mandatory locks */
 359         int (*mand_unlock_range)(struct cifsFileInfo *, struct file_lock *,
 360                                  const unsigned int);
 361         /* push brlocks from the cache to the server */
 362         int (*push_mand_locks)(struct cifsFileInfo *);
 363         /* get lease key of the inode */
 364         void (*get_lease_key)(struct inode *, struct cifs_fid *);
 365         /* set lease key of the inode */
 366         void (*set_lease_key)(struct inode *, struct cifs_fid *);
 367         /* generate new lease key */
 368         void (*new_lease_key)(struct cifs_fid *);
 369         int (*generate_signingkey)(struct cifs_ses *);
 370         int (*calc_signature)(struct smb_rqst *, struct TCP_Server_Info *);
 371         int (*query_mf_symlink)(const unsigned char *, char *, unsigned int *,
 372                                 struct cifs_sb_info *, unsigned int);
 373         /* if we can do cache read operations */
 374         bool (*is_read_op)(__u32);
 375         /* set oplock level for the inode */
 376         void (*set_oplock_level)(struct cifsInodeInfo *, __u32, unsigned int,
 377                                  bool *);
 378         /* create lease context buffer for CREATE request */
 379         char * (*create_lease_buf)(u8 *, u8);
 380         /* parse lease context buffer and return oplock/epoch info */
 381         __u8 (*parse_lease_buf)(void *, unsigned int *);
 382 };
 383
 384 struct smb_version_values {
 385         char            *version_string;
 386         __u16           protocol_id;
 387         __u32           req_capabilities;
 388         __u32           large_lock_type;
 389         __u32           exclusive_lock_type;
 390         __u32           shared_lock_type;
 391         __u32           unlock_lock_type;
 392         size_t          header_size;
 393         size_t          max_header_size;
 394         size_t          read_rsp_size;
 395         __le16          lock_cmd;
 396         unsigned int    cap_unix;
 397         unsigned int    cap_nt_find;
 398         unsigned int    cap_large_files;
 399         __u16           signing_enabled;
 400         __u16           signing_required;
 401         size_t          create_lease_size;
 402 };
 403
 404 #define HEADER_SIZE(server) (server->vals->header_size)
 405 #define MAX_HEADER_SIZE(server) (server->vals->max_header_size)
 406
 407 struct smb_vol {
 408         char *username;
 409         char *password;
 410         char *domainname;
 411         char *UNC;
 412         char *iocharset;  /* local code page for mapping to and from Unicode */
 413         char source_rfc1001_name[RFC1001_NAME_LEN_WITH_NULL]; /* clnt nb name */
 414         char target_rfc1001_name[RFC1001_NAME_LEN_WITH_NULL]; /* srvr nb name */
 415         kuid_t cred_uid;
 416         kuid_t linux_uid;
 417         kgid_t linux_gid;
 418         kuid_t backupuid;
 419         kgid_t backupgid;
 420         umode_t file_mode;
 421         umode_t dir_mode;
 422         enum securityEnum sectype; /* sectype requested via mnt opts */
 423         bool sign; /* was signing requested via mnt opts? */
 424         bool retry:1;
 425         bool intr:1;
 426         bool setuids:1;
 427         bool override_uid:1;
 428         bool override_gid:1;
 429         bool dynperm:1;
 430         bool noperm:1;
 431         bool no_psx_acl:1; /* set if posix acl support should be disabled */
 432         bool cifs_acl:1;
 433         bool backupuid_specified; /* mount option  backupuid  is specified */
 434         bool backupgid_specified; /* mount option  backupgid  is specified */
 435         bool no_xattr:1;   /* set if xattr (EA) support should be disabled*/
 436         bool server_ino:1; /* use inode numbers from server ie UniqueId */
 437         bool direct_io:1;
 438         bool strict_io:1; /* strict cache behavior */
 439         bool remap:1;      /* set to remap seven reserved chars in filenames */
 440         bool posix_paths:1; /* unset to not ask for posix pathnames. */
 441         bool no_linux_ext:1;
 442         bool sfu_emul:1;
 443         bool nullauth:1;   /* attempt to authenticate with null user */
 444         bool nocase:1;     /* request case insensitive filenames */
 445         bool nobrl:1;      /* disable sending byte range locks to srv */
 446         bool mand_lock:1;  /* send mandatory not posix byte range lock reqs */
 447         bool seal:1;       /* request transport encryption on share */
 448         bool nodfs:1;      /* Do not request DFS, even if available */
 449         bool local_lease:1; /* check leases only on local system, not remote */
 450         bool noblocksnd:1;
 451         bool noautotune:1;
 452         bool nostrictsync:1; /* do not force expensive SMBflush on every sync */
 453         bool fsc:1;     /* enable fscache */
 454         bool mfsymlinks:1; /* use Minshall+French Symlinks */
 455         bool multiuser:1;
 456         bool rwpidforward:1; /* pid forward for read/write operations */
 457         bool nosharesock;
 458         unsigned int rsize;
 459         unsigned int wsize;
 460         bool sockopt_tcp_nodelay:1;
 461         unsigned long actimeo; /* attribute cache timeout (jiffies) */
 462         struct smb_version_operations *ops;
 463         struct smb_version_values *vals;
 464         char *prepath;
 465         struct sockaddr_storage dstaddr; /* destination address */
 466         struct sockaddr_storage srcaddr; /* allow binding to a local IP */
 467         struct nls_table *local_nls;
 468 };
 469
 470 #define CIFS_MOUNT_MASK (CIFS_MOUNT_NO_PERM | CIFS_MOUNT_SET_UID | \
 471                          CIFS_MOUNT_SERVER_INUM | CIFS_MOUNT_DIRECT_IO | \
 472                          CIFS_MOUNT_NO_XATTR | CIFS_MOUNT_MAP_SPECIAL_CHR | \
 473                          CIFS_MOUNT_UNX_EMUL | CIFS_MOUNT_NO_BRL | \
 474                          CIFS_MOUNT_CIFS_ACL | CIFS_MOUNT_OVERR_UID | \
 475                          CIFS_MOUNT_OVERR_GID | CIFS_MOUNT_DYNPERM | \
 476                          CIFS_MOUNT_NOPOSIXBRL | CIFS_MOUNT_NOSSYNC | \
 477                          CIFS_MOUNT_FSCACHE | CIFS_MOUNT_MF_SYMLINKS | \
 478                          CIFS_MOUNT_MULTIUSER | CIFS_MOUNT_STRICT_IO | \
 479                          CIFS_MOUNT_CIFS_BACKUPUID | CIFS_MOUNT_CIFS_BACKUPGID)
 480
 481 #define CIFS_MS_MASK (MS_RDONLY | MS_MANDLOCK | MS_NOEXEC | MS_NOSUID | \
 482                       MS_NODEV | MS_SYNCHRONOUS)
 483
 484 struct cifs_mnt_data {
 485         struct cifs_sb_info *cifs_sb;
 486         struct smb_vol *vol;
 487         int flags;
 488 };
 489
 490 static inline unsigned int
 491 get_rfc1002_length(void *buf)
 492 {
 493         return be32_to_cpu(*((__be32 *)buf));
 494 }
 495
 496 static inline void
 497 inc_rfc1001_len(void *buf, int count)
 498 {
 499         be32_add_cpu((__be32 *)buf, count);
 500 }
 501
 502 struct TCP_Server_Info {
 503         struct list_head tcp_ses_list;
 504         struct list_head smb_ses_list;
 505         int srv_count; /* reference counter */
 506         /* 15 character server name + 0x20 16th byte indicating type = srv */
 507         char server_RFC1001_name[RFC1001_NAME_LEN_WITH_NULL];
 508         struct smb_version_operations   *ops;
 509         struct smb_version_values       *vals;
 510         enum statusEnum tcpStatus; /* what we think the status is */
 511         char *hostname; /* hostname portion of UNC string */
 512         struct socket *ssocket;
 513         struct sockaddr_storage dstaddr;
 514         struct sockaddr_storage srcaddr; /* locally bind to this IP */
 515 #ifdef CONFIG_NET_NS
 516         struct net *net;
 517 #endif
 518         wait_queue_head_t response_q;
 519         wait_queue_head_t request_q; /* if more than maxmpx to srvr must block*/
 520         struct list_head pending_mid_q;
 521         bool noblocksnd;                /* use blocking sendmsg */
 522         bool noautotune;                /* do not autotune send buf sizes */
 523         bool tcp_nodelay;
 524         int credits;  /* send no more requests at once */
 525         unsigned int in_flight;  /* number of requests on the wire to server */
 526         spinlock_t req_lock;  /* protect the two values above */
 527         struct mutex srv_mutex;
 528         struct task_struct *tsk;
 529         char server_GUID[16];
 530         __u16 sec_mode;
 531         bool sign; /* is signing enabled on this connection? */
 532         bool session_estab; /* mark when very first sess is established */
 533 #ifdef CONFIG_CIFS_SMB2
 534         int echo_credits;  /* echo reserved slots */
 535         int oplock_credits;  /* oplock break reserved slots */
 536         bool echoes:1; /* enable echoes */
 537 #endif
 538         u16 dialect; /* dialect index that server chose */
 539         bool oplocks:1; /* enable oplocks */
 540         unsigned int maxReq;    /* Clients should submit no more */
 541         /* than maxReq distinct unanswered SMBs to the server when using  */
 542         /* multiplexed reads or writes */
 543         unsigned int maxBuf;    /* maxBuf specifies the maximum */
 544         /* message size the server can send or receive for non-raw SMBs */
 545         /* maxBuf is returned by SMB NegotiateProtocol so maxBuf is only 0 */
 546         /* when socket is setup (and during reconnect) before NegProt sent */
 547         unsigned int max_rw;    /* maxRw specifies the maximum */
 548         /* message size the server can send or receive for */
 549         /* SMB_COM_WRITE_RAW or SMB_COM_READ_RAW. */
 550         unsigned int capabilities; /* selective disabling of caps by smb sess */
 551         int timeAdj;  /* Adjust for difference in server time zone in sec */
 552         __u64 CurrentMid;         /* multiplex id - rotating counter */
 553         char cryptkey[CIFS_CRYPTO_KEY_SIZE]; /* used by ntlm, ntlmv2 etc */
 554         /* 16th byte of RFC1001 workstation name is always null */
 555         char workstation_RFC1001_name[RFC1001_NAME_LEN_WITH_NULL];
 556         __u32 sequence_number; /* for signing, protected by srv_mutex */
 557         struct session_key session_key;
 558         unsigned long lstrp; /* when we got last response from this server */
 559         struct cifs_secmech secmech; /* crypto sec mech functs, descriptors */
 560 #define CIFS_NEGFLAVOR_LANMAN   0       /* wct == 13, LANMAN */
 561 #define CIFS_NEGFLAVOR_UNENCAP  1       /* wct == 17, but no ext_sec */
 562 #define CIFS_NEGFLAVOR_EXTENDED 2       /* wct == 17, ext_sec bit set */
 563         char    negflavor;      /* NEGOTIATE response flavor */
 564         /* extended security flavors that server supports */
 565         bool    sec_ntlmssp;            /* supports NTLMSSP */
 566         bool    sec_kerberosu2u;        /* supports U2U Kerberos */
 567         bool    sec_kerberos;           /* supports plain Kerberos */
 568         bool    sec_mskerberos;         /* supports legacy MS Kerberos */
 569         bool    large_buf;              /* is current buffer large? */
 570         struct delayed_work     echo; /* echo ping workqueue job */
 571         struct kvec *iov;       /* reusable kvec array for receives */
 572         unsigned int nr_iov;    /* number of kvecs in array */
 573         char    *smallbuf;      /* pointer to current "small" buffer */
 574         char    *bigbuf;        /* pointer to current "big" buffer */
 575         unsigned int total_read; /* total amount of data read in this pass */
 576 #ifdef CONFIG_CIFS_FSCACHE
 577         struct fscache_cookie   *fscache; /* client index cache cookie */
 578 #endif
 579 #ifdef CONFIG_CIFS_STATS2
 580         atomic_t in_send; /* requests trying to send */
 581         atomic_t num_waiters;   /* blocked waiting to get in sendrecv */
 582 #endif
 583 #ifdef CONFIG_CIFS_SMB2
 584         unsigned int    max_read;
 585         unsigned int    max_write;
 586 #endif /* CONFIG_CIFS_SMB2 */
 587 };
 588
 589 static inline unsigned int
 590 in_flight(struct TCP_Server_Info *server)
 591 {
 592         unsigned int num;
 593         spin_lock(&server->req_lock);
 594         num = server->in_flight;
 595         spin_unlock(&server->req_lock);
 596         return num;
 597 }
 598
 599 static inline bool
 600 has_credits(struct TCP_Server_Info *server, int *credits)
 601 {
 602         int num;
 603         spin_lock(&server->req_lock);
 604         num = *credits;
 605         spin_unlock(&server->req_lock);
 606         return num > 0;
 607 }
 608
 609 static inline void
 610 add_credits(struct TCP_Server_Info *server, const unsigned int add,
 611             const int optype)
 612 {
 613         server->ops->add_credits(server, add, optype);
 614 }
 615
 616 static inline void
 617 set_credits(struct TCP_Server_Info *server, const int val)
 618 {
 619         server->ops->set_credits(server, val);
 620 }
 621
 622 static inline __u64
 623 get_next_mid(struct TCP_Server_Info *server)
 624 {
 625         return server->ops->get_next_mid(server);
 626 }
 627
 628 /*
 629  * When the server supports very large reads and writes via POSIX extensions,
 630  * we can allow up to 2^24-1, minus the size of a READ/WRITE_AND_X header, not
 631  * including the RFC1001 length.
 632  *
 633  * Note that this might make for "interesting" allocation problems during
 634  * writeback however as we have to allocate an array of pointers for the
 635  * pages. A 16M write means ~32kb page array with PAGE_CACHE_SIZE == 4096.
 636  *
 637  * For reads, there is a similar problem as we need to allocate an array
 638  * of kvecs to handle the receive, though that should only need to be done
 639  * once.
 640  */
 641 #define CIFS_MAX_WSIZE ((1<<24) - 1 - sizeof(WRITE_REQ) + 4)
 642 #define CIFS_MAX_RSIZE ((1<<24) - sizeof(READ_RSP) + 4)
 643
 644 /*
 645  * When the server doesn't allow large posix writes, only allow a rsize/wsize
 646  * of 2^17-1 minus the size of the call header. That allows for a read or
 647  * write up to the maximum size described by RFC1002.
 648  */
 649 #define CIFS_MAX_RFC1002_WSIZE ((1<<17) - 1 - sizeof(WRITE_REQ) + 4)
 650 #define CIFS_MAX_RFC1002_RSIZE ((1<<17) - 1 - sizeof(READ_RSP) + 4)
 651
 652 /*
 653  * The default wsize is 1M. find_get_pages seems to return a maximum of 256
 654  * pages in a single call. With PAGE_CACHE_SIZE == 4k, this means we can fill
 655  * a single wsize request with a single call.
 656  */
 657 #define CIFS_DEFAULT_IOSIZE (1024 * 1024)
 658
 659 /*
 660  * Windows only supports a max of 60kb reads and 65535 byte writes. Default to
 661  * those values when posix extensions aren't in force. In actuality here, we
 662  * use 65536 to allow for a write that is a multiple of 4k. Most servers seem
 663  * to be ok with the extra byte even though Windows doesn't send writes that
 664  * are that large.
 665  *
 666  * Citation:
 667  *
 668  * http://blogs.msdn.com/b/openspecification/archive/2009/04/10/smb-maximum-transmit-buffer-size-and-performance-tuning.aspx
 669  */
 670 #define CIFS_DEFAULT_NON_POSIX_RSIZE (60 * 1024)
 671 #define CIFS_DEFAULT_NON_POSIX_WSIZE (65536)
 672
 673 /*
 674  * Macros to allow the TCP_Server_Info->net field and related code to drop out
 675  * when CONFIG_NET_NS isn't set.
 676  */
 677
 678 #ifdef CONFIG_NET_NS
 679
 680 static inline struct net *cifs_net_ns(struct TCP_Server_Info *srv)
 681 {
 682         return srv->net;
 683 }
 684
 685 static inline void cifs_set_net_ns(struct TCP_Server_Info *srv, struct net *net)
 686 {
 687         srv->net = net;
 688 }
 689
 690 #else
 691
 692 static inline struct net *cifs_net_ns(struct TCP_Server_Info *srv)
 693 {
 694         return &init_net;
 695 }
 696
 697 static inline void cifs_set_net_ns(struct TCP_Server_Info *srv, struct net *net)
 698 {
 699 }
 700
 701 #endif
 702
 703 /*
 704  * Session structure.  One of these for each uid session with a particular host
 705  */
 706 struct cifs_ses {
 707         struct list_head smb_ses_list;
 708         struct list_head tcon_list;
 709         struct mutex session_mutex;
 710         struct TCP_Server_Info *server; /* pointer to server info */
 711         int ses_count;          /* reference counter */
 712         enum statusEnum status;
 713         unsigned overrideSecFlg;  /* if non-zero override global sec flags */
 714         __u16 ipc_tid;          /* special tid for connection to IPC share */
 715         char *serverOS;         /* name of operating system underlying server */
 716         char *serverNOS;        /* name of network operating system of server */
 717         char *serverDomain;     /* security realm of server */
 718         __u64 Suid;             /* remote smb uid  */
 719         kuid_t linux_uid;       /* overriding owner of files on the mount */
 720         kuid_t cred_uid;        /* owner of credentials */
 721         unsigned int capabilities;
 722         char serverName[SERVER_NAME_LEN_WITH_NULL * 2]; /* BB make bigger for
 723                                 TCP names - will ipv6 and sctp addresses fit? */
 724         char *user_name;        /* must not be null except during init of sess
 725                                    and after mount option parsing we fill it */
 726         char *domainName;
 727         char *password;
 728         struct session_key auth_key;
 729         struct ntlmssp_auth *ntlmssp; /* ciphertext, flags, server challenge */
 730         enum securityEnum sectype; /* what security flavor was specified? */
 731         bool sign;              /* is signing required? */
 732         bool need_reconnect:1; /* connection reset, uid now invalid */
 733 #ifdef CONFIG_CIFS_SMB2
 734         __u16 session_flags;
 735         char smb3signingkey[SMB3_SIGN_KEY_SIZE]; /* for signing smb3 packets */
 736 #endif /* CONFIG_CIFS_SMB2 */
 737 };
 738
 739 static inline bool
 740 cap_unix(struct cifs_ses *ses)
 741 {
 742         return ses->server->vals->cap_unix & ses->capabilities;
 743 }
 744
 745 /*
 746  * there is one of these for each connection to a resource on a particular
 747  * session
 748  */
 749 struct cifs_tcon {
 750         struct list_head tcon_list;
 751         int tc_count;
 752         struct list_head openFileList;
 753         struct cifs_ses *ses;   /* pointer to session associated with */
 754         char treeName[MAX_TREE_SIZE + 1]; /* UNC name of resource in ASCII */
 755         char *nativeFileSystem;
 756         char *password;         /* for share-level security */
 757         __u32 tid;              /* The 4 byte tree id */
 758         __u16 Flags;            /* optional support bits */
 759         enum statusEnum tidStatus;
 760 #ifdef CONFIG_CIFS_STATS
 761         atomic_t num_smbs_sent;
 762         union {
 763                 struct {
 764                         atomic_t num_writes;
 765                         atomic_t num_reads;
 766                         atomic_t num_flushes;
 767                         atomic_t num_oplock_brks;
 768                         atomic_t num_opens;
 769                         atomic_t num_closes;
 770                         atomic_t num_deletes;
 771                         atomic_t num_mkdirs;
 772                         atomic_t num_posixopens;
 773                         atomic_t num_posixmkdirs;
 774                         atomic_t num_rmdirs;
 775                         atomic_t num_renames;
 776                         atomic_t num_t2renames;
 777                         atomic_t num_ffirst;
 778                         atomic_t num_fnext;
 779                         atomic_t num_fclose;
 780                         atomic_t num_hardlinks;
 781                         atomic_t num_symlinks;
 782                         atomic_t num_locks;
 783                         atomic_t num_acl_get;
 784                         atomic_t num_acl_set;
 785                 } cifs_stats;
 786 #ifdef CONFIG_CIFS_SMB2
 787                 struct {
 788                         atomic_t smb2_com_sent[NUMBER_OF_SMB2_COMMANDS];
 789                         atomic_t smb2_com_failed[NUMBER_OF_SMB2_COMMANDS];
 790                 } smb2_stats;
 791 #endif /* CONFIG_CIFS_SMB2 */
 792         } stats;
 793 #ifdef CONFIG_CIFS_STATS2
 794         unsigned long long time_writes;
 795         unsigned long long time_reads;
 796         unsigned long long time_opens;
 797         unsigned long long time_deletes;
 798         unsigned long long time_closes;
 799         unsigned long long time_mkdirs;
 800         unsigned long long time_rmdirs;
 801         unsigned long long time_renames;
 802         unsigned long long time_t2renames;
 803         unsigned long long time_ffirst;
 804         unsigned long long time_fnext;
 805         unsigned long long time_fclose;
 806 #endif /* CONFIG_CIFS_STATS2 */
 807         __u64    bytes_read;
 808         __u64    bytes_written;
 809         spinlock_t stat_lock;
 810 #endif /* CONFIG_CIFS_STATS */
 811         FILE_SYSTEM_DEVICE_INFO fsDevInfo;
 812         FILE_SYSTEM_ATTRIBUTE_INFO fsAttrInfo; /* ok if fs name truncated */
 813         FILE_SYSTEM_UNIX_INFO fsUnixInfo;
 814         bool ipc:1;             /* set if connection to IPC$ eg for RPC/PIPES */
 815         bool retry:1;
 816         bool nocase:1;
 817         bool seal:1;      /* transport encryption for this mounted share */
 818         bool unix_ext:1;  /* if false disable Linux extensions to CIFS protocol
 819                                 for this mount even if server would support */
 820         bool local_lease:1; /* check leases (only) on local system not remote */
 821         bool broken_posix_open; /* e.g. Samba server versions < 3.3.2, 3.2.9 */
 822         bool need_reconnect:1; /* connection reset, tid now invalid */
 823 #ifdef CONFIG_CIFS_SMB2
 824         bool print:1;           /* set if connection to printer share */
 825         bool bad_network_name:1; /* set if ret status STATUS_BAD_NETWORK_NAME */
 826         __le32 capabilities;
 827         __u32 share_flags;
 828         __u32 maximal_access;
 829         __u32 vol_serial_number;
 830         __le64 vol_create_time;
 831 #endif /* CONFIG_CIFS_SMB2 */
 832 #ifdef CONFIG_CIFS_FSCACHE
 833         u64 resource_id;                /* server resource id */
 834         struct fscache_cookie *fscache; /* cookie for share */
 835 #endif
 836         struct list_head pending_opens; /* list of incomplete opens */
 837         /* BB add field for back pointer to sb struct(s)? */
 838 };
 839
 840 /*
 841  * This is a refcounted and timestamped container for a tcon pointer. The
 842  * container holds a tcon reference. It is considered safe to free one of
 843  * these when the tl_count goes to 0. The tl_time is the time of the last
 844  * "get" on the container.
 845  */
 846 struct tcon_link {
 847         struct rb_node          tl_rbnode;
 848         kuid_t                  tl_uid;
 849         unsigned long           tl_flags;
 850 #define TCON_LINK_MASTER        0
 851 #define TCON_LINK_PENDING       1
 852 #define TCON_LINK_IN_TREE       2
 853         unsigned long           tl_time;
 854         atomic_t                tl_count;
 855         struct cifs_tcon        *tl_tcon;
 856 };
 857
 858 extern struct tcon_link *cifs_sb_tlink(struct cifs_sb_info *cifs_sb);
 859
 860 static inline struct cifs_tcon *
 861 tlink_tcon(struct tcon_link *tlink)
 862 {
 863         return tlink->tl_tcon;
 864 }
 865
 866 extern void cifs_put_tlink(struct tcon_link *tlink);
 867
 868 static inline struct tcon_link *
 869 cifs_get_tlink(struct tcon_link *tlink)
 870 {
 871         if (tlink && !IS_ERR(tlink))
 872                 atomic_inc(&tlink->tl_count);
 873         return tlink;
 874 }
 875
 876 /* This function is always expected to succeed */
 877 extern struct cifs_tcon *cifs_sb_master_tcon(struct cifs_sb_info *cifs_sb);
 878
 879 #define CIFS_OPLOCK_NO_CHANGE 0xfe
 880
 881 struct cifs_pending_open {
 882         struct list_head olist;
 883         struct tcon_link *tlink;
 884         __u8 lease_key[16];
 885         __u32 oplock;
 886 };
 887
 888 /*
 889  * This info hangs off the cifsFileInfo structure, pointed to by llist.
 890  * This is used to track byte stream locks on the file
 891  */
 892 struct cifsLockInfo {
 893         struct list_head llist; /* pointer to next cifsLockInfo */
 894         struct list_head blist; /* pointer to locks blocked on this */
 895         wait_queue_head_t block_q;
 896         __u64 offset;
 897         __u64 length;
 898         __u32 pid;
 899         __u32 type;
 900 };
 901
 902 /*
 903  * One of these for each open instance of a file
 904  */
 905 struct cifs_search_info {
 906         loff_t index_of_last_entry;
 907         __u16 entries_in_buffer;
 908         __u16 info_level;
 909         __u32 resume_key;
 910         char *ntwrk_buf_start;
 911         char *srch_entries_start;
 912         char *last_entry;
 913         const char *presume_name;
 914         unsigned int resume_name_len;
 915         bool endOfSearch:1;
 916         bool emptyDir:1;
 917         bool unicode:1;
 918         bool smallBuf:1; /* so we know which buf_release function to call */
 919 };
 920
 921 struct cifs_open_parms {
 922         struct cifs_tcon *tcon;
 923         struct cifs_sb_info *cifs_sb;
 924         int disposition;
 925         int desired_access;
 926         int create_options;
 927         const char *path;
 928         struct cifs_fid *fid;
 929         bool reconnect:1;
 930 };
 931
 932 struct cifs_fid {
 933         __u16 netfid;
 934 #ifdef CONFIG_CIFS_SMB2
 935         __u64 persistent_fid;   /* persist file id for smb2 */
 936         __u64 volatile_fid;     /* volatile file id for smb2 */
 937         __u8 lease_key[SMB2_LEASE_KEY_SIZE];    /* lease key for smb2 */
 938 #endif
 939         struct cifs_pending_open *pending_open;
 940         unsigned int epoch;
 941         bool purge_cache;
 942 };
 943
 944 struct cifs_fid_locks {
 945         struct list_head llist;
 946         struct cifsFileInfo *cfile;     /* fid that owns locks */
 947         struct list_head locks;         /* locks held by fid above */
 948 };
 949
 950 struct cifsFileInfo {
 951         struct list_head tlist; /* pointer to next fid owned by tcon */
 952         struct list_head flist; /* next fid (file instance) for this inode */
 953         struct cifs_fid_locks *llist;   /* brlocks held by this fid */
 954         kuid_t uid;             /* allows finding which FileInfo structure */
 955         __u32 pid;              /* process id who opened file */
 956         struct cifs_fid fid;    /* file id from remote */
 957         /* BB add lock scope info here if needed */ ;
 958         /* lock scope id (0 if none) */
 959         struct dentry *dentry;
 960         unsigned int f_flags;
 961         struct tcon_link *tlink;
 962         bool invalidHandle:1;   /* file closed via session abend */
 963         bool oplock_break_cancelled:1;
 964         int count;              /* refcount protected by cifs_file_list_lock */
 965         struct mutex fh_mutex; /* prevents reopen race after dead ses*/
 966         struct cifs_search_info srch_inf;
 967         struct work_struct oplock_break; /* work for oplock breaks */
 968 };
 969
 970 struct cifs_io_parms {
 971         __u16 netfid;
 972 #ifdef CONFIG_CIFS_SMB2
 973         __u64 persistent_fid;   /* persist file id for smb2 */
 974         __u64 volatile_fid;     /* volatile file id for smb2 */
 975 #endif
 976         __u32 pid;
 977         __u64 offset;
 978         unsigned int length;
 979         struct cifs_tcon *tcon;
 980 };
 981
 982 struct cifs_readdata;
 983
 984 /* asynchronous read support */
 985 struct cifs_readdata {
 986         struct kref                     refcount;
 987         struct list_head                list;
 988         struct completion               done;
 989         struct cifsFileInfo             *cfile;
 990         struct address_space            *mapping;
 991         __u64                           offset;
 992         unsigned int                    bytes;
 993         pid_t                           pid;
 994         int                             result;
 995         struct work_struct              work;
 996         int (*read_into_pages)(struct TCP_Server_Info *server,
 997                                 struct cifs_readdata *rdata,
 998                                 unsigned int len);
 999         struct kvec                     iov;
1000         unsigned int                    pagesz;
1001         unsigned int                    tailsz;
1002         unsigned int                    nr_pages;
1003         struct page                     *pages[];
1004 };
1005
1006 struct cifs_writedata;
1007
1008 /* asynchronous write support */
1009 struct cifs_writedata {
1010         struct kref                     refcount;
1011         struct list_head                list;
1012         struct completion               done;
1013         enum writeback_sync_modes       sync_mode;
1014         struct work_struct              work;
1015         struct cifsFileInfo             *cfile;
1016         __u64                           offset;
1017         pid_t                           pid;
1018         unsigned int                    bytes;
1019         int                             result;
1020         unsigned int                    pagesz;
1021         unsigned int                    tailsz;
1022         unsigned int                    nr_pages;
1023         struct page                     *pages[1];
1024 };
1025
1026 /*
1027  * Take a reference on the file private data. Must be called with
1028  * cifs_file_list_lock held.
1029  */
1030 static inline void
1031 cifsFileInfo_get_locked(struct cifsFileInfo *cifs_file)
1032 {
1033         ++cifs_file->count;
1034 }
1035
1036 struct cifsFileInfo *cifsFileInfo_get(struct cifsFileInfo *cifs_file);
1037 void cifsFileInfo_put(struct cifsFileInfo *cifs_file);
1038
1039 #define CIFS_CACHE_READ_FLG     1
1040 #define CIFS_CACHE_HANDLE_FLG   2
1041 #define CIFS_CACHE_RH_FLG       (CIFS_CACHE_READ_FLG | CIFS_CACHE_HANDLE_FLG)
1042 #define CIFS_CACHE_WRITE_FLG    4
1043 #define CIFS_CACHE_RW_FLG       (CIFS_CACHE_READ_FLG | CIFS_CACHE_WRITE_FLG)
1044 #define CIFS_CACHE_RHW_FLG      (CIFS_CACHE_RW_FLG | CIFS_CACHE_HANDLE_FLG)
1045
1046 #define CIFS_CACHE_READ(cinode) (cinode->oplock & CIFS_CACHE_READ_FLG)
1047 #define CIFS_CACHE_HANDLE(cinode) (cinode->oplock & CIFS_CACHE_HANDLE_FLG)
1048 #define CIFS_CACHE_WRITE(cinode) (cinode->oplock & CIFS_CACHE_WRITE_FLG)
1049
1050 /*
1051  * One of these for each file inode
1052  */
1053
1054 struct cifsInodeInfo {
1055         bool can_cache_brlcks;
1056         struct list_head llist; /* locks helb by this inode */
1057         struct rw_semaphore lock_sem;   /* protect the fields above */
1058         /* BB add in lists for dirty pages i.e. write caching info for oplock */
1059         struct list_head openFileList;
1060         __u32 cifsAttrs; /* e.g. DOS archive bit, sparse, compressed, system */
1061         unsigned int oplock;            /* oplock/lease level we have */
1062         unsigned int epoch;             /* used to track lease state changes */
1063         bool delete_pending;            /* DELETE_ON_CLOSE is set */
1064         bool invalid_mapping;           /* pagecache is invalid */
1065         unsigned long time;             /* jiffies of last update of inode */
1066         u64  server_eof;                /* current file size on server -- protected by i_lock */
1067         u64  uniqueid;                  /* server inode number */
1068         u64  createtime;                /* creation time on server */
1069 #ifdef CONFIG_CIFS_SMB2
1070         __u8 lease_key[SMB2_LEASE_KEY_SIZE];    /* lease key for this inode */
1071 #endif
1072 #ifdef CONFIG_CIFS_FSCACHE
1073         struct fscache_cookie *fscache;
1074 #endif
1075         struct inode vfs_inode;
1076 };
1077
1078 static inline struct cifsInodeInfo *
1079 CIFS_I(struct inode *inode)
1080 {
1081         return container_of(inode, struct cifsInodeInfo, vfs_inode);
1082 }
1083
1084 static inline struct cifs_sb_info *
1085 CIFS_SB(struct super_block *sb)
1086 {
1087         return sb->s_fs_info;
1088 }
1089
1090 static inline char CIFS_DIR_SEP(const struct cifs_sb_info *cifs_sb)
1091 {
1092         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_POSIX_PATHS)
1093                 return '/';
1094         else
1095                 return '\\';
1096 }
1097
1098 static inline void
1099 convert_delimiter(char *path, char delim)
1100 {
1101         char old_delim, *pos;
1102
1103         if (delim == '/')
1104                 old_delim = '\\';
1105         else
1106                 old_delim = '/';
1107
1108         pos = path;
1109         while ((pos = strchr(pos, old_delim)))
1110                 *pos = delim;
1111 }
1112
1113 #ifdef CONFIG_CIFS_STATS
1114 #define cifs_stats_inc atomic_inc
1115
1116 static inline void cifs_stats_bytes_written(struct cifs_tcon *tcon,
1117                                             unsigned int bytes)
1118 {
1119         if (bytes) {
1120                 spin_lock(&tcon->stat_lock);
1121                 tcon->bytes_written += bytes;
1122                 spin_unlock(&tcon->stat_lock);
1123         }
1124 }
1125
1126 static inline void cifs_stats_bytes_read(struct cifs_tcon *tcon,
1127                                          unsigned int bytes)
1128 {
1129         spin_lock(&tcon->stat_lock);
1130         tcon->bytes_read += bytes;
1131         spin_unlock(&tcon->stat_lock);
1132 }
1133 #else
1134
1135 #define  cifs_stats_inc(field) do {} while (0)
1136 #define  cifs_stats_bytes_written(tcon, bytes) do {} while (0)
1137 #define  cifs_stats_bytes_read(tcon, bytes) do {} while (0)
1138
1139 #endif
1140
1141
1142 /*
1143  * This is the prototype for the mid receive function. This function is for
1144  * receiving the rest of the SMB frame, starting with the WordCount (which is
1145  * just after the MID in struct smb_hdr). Note:
1146  *
1147  * - This will be called by cifsd, with no locks held.
1148  * - The mid will still be on the pending_mid_q.
1149  * - mid->resp_buf will point to the current buffer.
1150  *
1151  * Returns zero on a successful receive, or an error. The receive state in
1152  * the TCP_Server_Info will also be updated.
1153  */
1154 typedef int (mid_receive_t)(struct TCP_Server_Info *server,
1155                             struct mid_q_entry *mid);
1156
1157 /*
1158  * This is the prototype for the mid callback function. This is called once the
1159  * mid has been received off of the socket. When creating one, take special
1160  * care to avoid deadlocks. Things to bear in mind:
1161  *
1162  * - it will be called by cifsd, with no locks held
1163  * - the mid will be removed from any lists
1164  */
1165 typedef void (mid_callback_t)(struct mid_q_entry *mid);
1166
1167 /* one of these for every pending CIFS request to the server */
1168 struct mid_q_entry {
1169         struct list_head qhead; /* mids waiting on reply from this server */
1170         struct TCP_Server_Info *server; /* server corresponding to this mid */
1171         __u64 mid;              /* multiplex id */
1172         __u32 pid;              /* process id */
1173         __u32 sequence_number;  /* for CIFS signing */
1174         unsigned long when_alloc;  /* when mid was created */
1175 #ifdef CONFIG_CIFS_STATS2
1176         unsigned long when_sent; /* time when smb send finished */
1177         unsigned long when_received; /* when demux complete (taken off wire) */
1178 #endif
1179         mid_receive_t *receive; /* call receive callback */
1180         mid_callback_t *callback; /* call completion callback */
1181         void *callback_data;      /* general purpose pointer for callback */
1182         void *resp_buf;         /* pointer to received SMB header */
1183         int mid_state;  /* wish this were enum but can not pass to wait_event */
1184         __le16 command;         /* smb command code */
1185         bool large_buf:1;       /* if valid response, is pointer to large buf */
1186         bool multiRsp:1;        /* multiple trans2 responses for one request  */
1187         bool multiEnd:1;        /* both received */
1188 };
1189
1190 /*      Make code in transport.c a little cleaner by moving
1191         update of optional stats into function below */
1192 #ifdef CONFIG_CIFS_STATS2
1193
1194 static inline void cifs_in_send_inc(struct TCP_Server_Info *server)
1195 {
1196         atomic_inc(&server->in_send);
1197 }
1198
1199 static inline void cifs_in_send_dec(struct TCP_Server_Info *server)
1200 {
1201         atomic_dec(&server->in_send);
1202 }
1203
1204 static inline void cifs_num_waiters_inc(struct TCP_Server_Info *server)
1205 {
1206         atomic_inc(&server->num_waiters);
1207 }
1208
1209 static inline void cifs_num_waiters_dec(struct TCP_Server_Info *server)
1210 {
1211         atomic_dec(&server->num_waiters);
1212 }
1213
1214 static inline void cifs_save_when_sent(struct mid_q_entry *mid)
1215 {
1216         mid->when_sent = jiffies;
1217 }
1218 #else
1219 static inline void cifs_in_send_inc(struct TCP_Server_Info *server)
1220 {
1221 }
1222 static inline void cifs_in_send_dec(struct TCP_Server_Info *server)
1223 {
1224 }
1225
1226 static inline void cifs_num_waiters_inc(struct TCP_Server_Info *server)
1227 {
1228 }
1229
1230 static inline void cifs_num_waiters_dec(struct TCP_Server_Info *server)
1231 {
1232 }
1233
1234 static inline void cifs_save_when_sent(struct mid_q_entry *mid)
1235 {
1236 }
1237 #endif
1238
1239 /* for pending dnotify requests */
1240 struct dir_notify_req {
1241         struct list_head lhead;
1242         __le16 Pid;
1243         __le16 PidHigh;
1244         __u16 Mid;
1245         __u16 Tid;
1246         __u16 Uid;
1247         __u16 netfid;
1248         __u32 filter; /* CompletionFilter (for multishot) */
1249         int multishot;
1250         struct file *pfile;
1251 };
1252
1253 struct dfs_info3_param {
1254         int flags; /* DFSREF_REFERRAL_SERVER, DFSREF_STORAGE_SERVER*/
1255         int path_consumed;
1256         int server_type;
1257         int ref_flag;
1258         char *path_name;
1259         char *node_name;
1260 };
1261
1262 /*
1263  * common struct for holding inode info when searching for or updating an
1264  * inode with new info
1265  */
1266
1267 #define CIFS_FATTR_DFS_REFERRAL         0x1
1268 #define CIFS_FATTR_DELETE_PENDING       0x2
1269 #define CIFS_FATTR_NEED_REVAL           0x4
1270 #define CIFS_FATTR_INO_COLLISION        0x8
1271
1272 struct cifs_fattr {
1273         u32             cf_flags;
1274         u32             cf_cifsattrs;
1275         u64             cf_uniqueid;
1276         u64             cf_eof;
1277         u64             cf_bytes;
1278         u64             cf_createtime;
1279         kuid_t          cf_uid;
1280         kgid_t          cf_gid;
1281         umode_t         cf_mode;
1282         dev_t           cf_rdev;
1283         unsigned int    cf_nlink;
1284         unsigned int    cf_dtype;
1285         struct timespec cf_atime;
1286         struct timespec cf_mtime;
1287         struct timespec cf_ctime;
1288 };
1289
1290 static inline void free_dfs_info_param(struct dfs_info3_param *param)
1291 {
1292         if (param) {
1293                 kfree(param->path_name);
1294                 kfree(param->node_name);
1295                 kfree(param);
1296         }
1297 }
1298
1299 static inline void free_dfs_info_array(struct dfs_info3_param *param,
1300                                        int number_of_items)
1301 {
1302         int i;
1303         if ((number_of_items == 0) || (param == NULL))
1304                 return;
1305         for (i = 0; i < number_of_items; i++) {
1306                 kfree(param[i].path_name);
1307                 kfree(param[i].node_name);
1308         }
1309         kfree(param);
1310 }
1311
1312 #define   MID_FREE 0
1313 #define   MID_REQUEST_ALLOCATED 1
1314 #define   MID_REQUEST_SUBMITTED 2
1315 #define   MID_RESPONSE_RECEIVED 4
1316 #define   MID_RETRY_NEEDED      8 /* session closed while this request out */
1317 #define   MID_RESPONSE_MALFORMED 0x10
1318 #define   MID_SHUTDOWN           0x20
1319
1320 /* Types of response buffer returned from SendReceive2 */
1321 #define   CIFS_NO_BUFFER        0    /* Response buffer not returned */
1322 #define   CIFS_SMALL_BUFFER     1
1323 #define   CIFS_LARGE_BUFFER     2
1324 #define   CIFS_IOVEC            4    /* array of response buffers */
1325
1326 /* Type of Request to SendReceive2 */
1327 #define   CIFS_BLOCKING_OP      1    /* operation can block */
1328 #define   CIFS_ASYNC_OP         2    /* do not wait for response */
1329 #define   CIFS_TIMEOUT_MASK 0x003    /* only one of above set in req */
1330 #define   CIFS_LOG_ERROR    0x010    /* log NT STATUS if non-zero */
1331 #define   CIFS_LARGE_BUF_OP 0x020    /* large request buffer */
1332 #define   CIFS_NO_RESP      0x040    /* no response buffer required */
1333
1334 /* Type of request operation */
1335 #define   CIFS_ECHO_OP      0x080    /* echo request */
1336 #define   CIFS_OBREAK_OP   0x0100    /* oplock break request */
1337 #define   CIFS_NEG_OP      0x0200    /* negotiate request */
1338 #define   CIFS_OP_MASK     0x0380    /* mask request type */
1339
1340 /* Security Flags: indicate type of session setup needed */
1341 #define   CIFSSEC_MAY_SIGN      0x00001
1342 #define   CIFSSEC_MAY_NTLM      0x00002
1343 #define   CIFSSEC_MAY_NTLMV2    0x00004
1344 #define   CIFSSEC_MAY_KRB5      0x00008
1345 #ifdef CONFIG_CIFS_WEAK_PW_HASH
1346 #define   CIFSSEC_MAY_LANMAN    0x00010
1347 #define   CIFSSEC_MAY_PLNTXT    0x00020
1348 #else
1349 #define   CIFSSEC_MAY_LANMAN    0
1350 #define   CIFSSEC_MAY_PLNTXT    0
1351 #endif /* weak passwords */
1352 #define   CIFSSEC_MAY_SEAL      0x00040 /* not supported yet */
1353 #define   CIFSSEC_MAY_NTLMSSP   0x00080 /* raw ntlmssp with ntlmv2 */
1354
1355 #define   CIFSSEC_MUST_SIGN     0x01001
1356 /* note that only one of the following can be set so the
1357 result of setting MUST flags more than once will be to
1358 require use of the stronger protocol */
1359 #define   CIFSSEC_MUST_NTLM     0x02002
1360 #define   CIFSSEC_MUST_NTLMV2   0x04004
1361 #define   CIFSSEC_MUST_KRB5     0x08008
1362 #ifdef CONFIG_CIFS_WEAK_PW_HASH
1363 #define   CIFSSEC_MUST_LANMAN   0x10010
1364 #define   CIFSSEC_MUST_PLNTXT   0x20020
1365 #ifdef CONFIG_CIFS_UPCALL
1366 #define   CIFSSEC_MASK          0xBF0BF /* allows weak security but also krb5 */
1367 #else
1368 #define   CIFSSEC_MASK          0xB70B7 /* current flags supported if weak */
1369 #endif /* UPCALL */
1370 #else /* do not allow weak pw hash */
1371 #define   CIFSSEC_MUST_LANMAN   0
1372 #define   CIFSSEC_MUST_PLNTXT   0
1373 #ifdef CONFIG_CIFS_UPCALL
1374 #define   CIFSSEC_MASK          0x8F08F /* flags supported if no weak allowed */
1375 #else
1376 #define   CIFSSEC_MASK          0x87087 /* flags supported if no weak allowed */
1377 #endif /* UPCALL */
1378 #endif /* WEAK_PW_HASH */
1379 #define   CIFSSEC_MUST_SEAL     0x40040 /* not supported yet */
1380 #define   CIFSSEC_MUST_NTLMSSP  0x80080 /* raw ntlmssp with ntlmv2 */
1381
1382 #define   CIFSSEC_DEF (CIFSSEC_MAY_SIGN | CIFSSEC_MAY_NTLMV2 | CIFSSEC_MAY_NTLMSSP)
1383 #define   CIFSSEC_MAX (CIFSSEC_MUST_SIGN | CIFSSEC_MUST_NTLMV2)
1384 #define   CIFSSEC_AUTH_MASK (CIFSSEC_MAY_NTLM | CIFSSEC_MAY_NTLMV2 | CIFSSEC_MAY_LANMAN | CIFSSEC_MAY_PLNTXT | CIFSSEC_MAY_KRB5 | CIFSSEC_MAY_NTLMSSP)
1385 /*
1386  *****************************************************************
1387  * All constants go here
1388  *****************************************************************
1389  */
1390
1391 #define UID_HASH (16)
1392
1393 /*
1394  * Note that ONE module should define _DECLARE_GLOBALS_HERE to cause the
1395  * following to be declared.
1396  */
1397
1398 /****************************************************************************
1399  *  Locking notes.  All updates to global variables and lists should be
1400  *                  protected by spinlocks or semaphores.
1401  *
1402  *  Spinlocks
1403  *  ---------
1404  *  GlobalMid_Lock protects:
1405  *      list operations on pending_mid_q and oplockQ
1406  *      updates to XID counters, multiplex id  and SMB sequence numbers
1407  *  cifs_file_list_lock protects:
1408  *      list operations on tcp and SMB session lists and tCon lists
1409  *  f_owner.lock protects certain per file struct operations
1410  *  mapping->page_lock protects certain per page operations
1411  *
1412  *  Semaphores
1413  *  ----------
1414  *  sesSem     operations on smb session
1415  *  tconSem    operations on tree connection
1416  *  fh_sem      file handle reconnection operations
1417  *
1418  ****************************************************************************/
1419
1420 #ifdef DECLARE_GLOBALS_HERE
1421 #define GLOBAL_EXTERN
1422 #else
1423 #define GLOBAL_EXTERN extern
1424 #endif
1425
1426 /*
1427  * the list of TCP_Server_Info structures, ie each of the sockets
1428  * connecting our client to a distinct server (ip address), is
1429  * chained together by cifs_tcp_ses_list. The list of all our SMB
1430  * sessions (and from that the tree connections) can be found
1431  * by iterating over cifs_tcp_ses_list
1432  */
1433 GLOBAL_EXTERN struct list_head          cifs_tcp_ses_list;
1434
1435 /*
1436  * This lock protects the cifs_tcp_ses_list, the list of smb sessions per
1437  * tcp session, and the list of tcon's per smb session. It also protects
1438  * the reference counters for the server, smb session, and tcon. Finally,
1439  * changes to the tcon->tidStatus should be done while holding this lock.
1440  */
1441 GLOBAL_EXTERN spinlock_t                cifs_tcp_ses_lock;
1442
1443 /*
1444  * This lock protects the cifs_file->llist and cifs_file->flist
1445  * list operations, and updates to some flags (cifs_file->invalidHandle)
1446  * It will be moved to either use the tcon->stat_lock or equivalent later.
1447  * If cifs_tcp_ses_lock and the lock below are both needed to be held, then
1448  * the cifs_tcp_ses_lock must be grabbed first and released last.
1449  */
1450 GLOBAL_EXTERN spinlock_t        cifs_file_list_lock;
1451
1452 #ifdef CONFIG_CIFS_DNOTIFY_EXPERIMENTAL /* unused temporarily */
1453 /* Outstanding dir notify requests */
1454 GLOBAL_EXTERN struct list_head GlobalDnotifyReqList;
1455 /* DirNotify response queue */
1456 GLOBAL_EXTERN struct list_head GlobalDnotifyRsp_Q;
1457 #endif /* was needed for dnotify, and will be needed for inotify when VFS fix */
1458
1459 /*
1460  * Global transaction id (XID) information
1461  */
1462 GLOBAL_EXTERN unsigned int GlobalCurrentXid;    /* protected by GlobalMid_Sem */
1463 GLOBAL_EXTERN unsigned int GlobalTotalActiveXid; /* prot by GlobalMid_Sem */
1464 GLOBAL_EXTERN unsigned int GlobalMaxActiveXid;  /* prot by GlobalMid_Sem */
1465 GLOBAL_EXTERN spinlock_t GlobalMid_Lock;  /* protects above & list operations */
1466                                           /* on midQ entries */
1467 /*
1468  *  Global counters, updated atomically
1469  */
1470 GLOBAL_EXTERN atomic_t sesInfoAllocCount;
1471 GLOBAL_EXTERN atomic_t tconInfoAllocCount;
1472 GLOBAL_EXTERN atomic_t tcpSesAllocCount;
1473 GLOBAL_EXTERN atomic_t tcpSesReconnectCount;
1474 GLOBAL_EXTERN atomic_t tconInfoReconnectCount;
1475
1476 /* Various Debug counters */
1477 GLOBAL_EXTERN atomic_t bufAllocCount;    /* current number allocated  */
1478 #ifdef CONFIG_CIFS_STATS2
1479 GLOBAL_EXTERN atomic_t totBufAllocCount; /* total allocated over all time */
1480 GLOBAL_EXTERN atomic_t totSmBufAllocCount;
1481 #endif
1482 GLOBAL_EXTERN atomic_t smBufAllocCount;
1483 GLOBAL_EXTERN atomic_t midCount;
1484
1485 /* Misc globals */
1486 GLOBAL_EXTERN bool enable_oplocks; /* enable or disable oplocks */
1487 GLOBAL_EXTERN unsigned int lookupCacheEnabled;
1488 GLOBAL_EXTERN unsigned int global_secflags;     /* if on, session setup sent
1489                                 with more secure ntlmssp2 challenge/resp */
1490 GLOBAL_EXTERN unsigned int sign_CIFS_PDUs;  /* enable smb packet signing */
1491 GLOBAL_EXTERN unsigned int linuxExtEnabled;/*enable Linux/Unix CIFS extensions*/
1492 GLOBAL_EXTERN unsigned int CIFSMaxBufSize;  /* max size not including hdr */
1493 GLOBAL_EXTERN unsigned int cifs_min_rcv;    /* min size of big ntwrk buf pool */
1494 GLOBAL_EXTERN unsigned int cifs_min_small;  /* min size of small buf pool */
1495 GLOBAL_EXTERN unsigned int cifs_max_pending; /* MAX requests at once to server*/
1496
1497 #ifdef CONFIG_CIFS_ACL
1498 GLOBAL_EXTERN struct rb_root uidtree;
1499 GLOBAL_EXTERN struct rb_root gidtree;
1500 GLOBAL_EXTERN spinlock_t siduidlock;
1501 GLOBAL_EXTERN spinlock_t sidgidlock;
1502 GLOBAL_EXTERN struct rb_root siduidtree;
1503 GLOBAL_EXTERN struct rb_root sidgidtree;
1504 GLOBAL_EXTERN spinlock_t uidsidlock;
1505 GLOBAL_EXTERN spinlock_t gidsidlock;
1506 #endif /* CONFIG_CIFS_ACL */
1507
1508 void cifs_oplock_break(struct work_struct *work);
1509
1510 extern const struct slow_work_ops cifs_oplock_break_ops;
1511 extern struct workqueue_struct *cifsiod_wq;
1512
1513 extern mempool_t *cifs_mid_poolp;
1514
1515 /* Operations for different SMB versions */
1516 #define SMB1_VERSION_STRING     "1.0"
1517 extern struct smb_version_operations smb1_operations;
1518 extern struct smb_version_values smb1_values;
1519 #define SMB20_VERSION_STRING    "2.0"
1520 extern struct smb_version_operations smb20_operations;
1521 extern struct smb_version_values smb20_values;
1522 #define SMB21_VERSION_STRING    "2.1"
1523 extern struct smb_version_operations smb21_operations;
1524 extern struct smb_version_values smb21_values;
1525 #define SMB30_VERSION_STRING    "3.0"
1526 extern struct smb_version_operations smb30_operations;
1527 extern struct smb_version_values smb30_values;
1528 #define SMB302_VERSION_STRING   "3.02"
1529 /*extern struct smb_version_operations smb302_operations;*/ /* not needed yet */
1530 extern struct smb_version_values smb302_values;
1531 #endif  /* _CIFS_GLOB_H */