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/slow-work.h>
  26 #include "cifs_fs_sb.h"
  27 #include "cifsacl.h"
  28 /*
  29  * The sizes of various internal tables and strings
  30  */
  31 #define MAX_UID_INFO 16
  32 #define MAX_SES_INFO 2
  33 #define MAX_TCON_INFO 4
  34
  35 #define MAX_TREE_SIZE (2 + MAX_SERVER_SIZE + 1 + MAX_SHARE_SIZE + 1)
  36 #define MAX_SERVER_SIZE 15
  37 #define MAX_SHARE_SIZE  64      /* used to be 20, this should still be enough */
  38 #define MAX_USERNAME_SIZE 32    /* 32 is to allow for 15 char names + null
  39                                    termination then *2 for unicode versions */
  40 #define MAX_PASSWORD_SIZE 512  /* max for windows seems to be 256 wide chars */
  41
  42 #define CIFS_MIN_RCV_POOL 4
  43
  44 /*
  45  * MAX_REQ is the maximum number of requests that WE will send
  46  * on one socket concurrently. It also matches the most common
  47  * value of max multiplex returned by servers.  We may
  48  * eventually want to use the negotiated value (in case
  49  * future servers can handle more) when we are more confident that
  50  * we will not have problems oveloading the socket with pending
  51  * write data.
  52  */
  53 #define CIFS_MAX_REQ 50
  54
  55 #define RFC1001_NAME_LEN 15
  56 #define RFC1001_NAME_LEN_WITH_NULL (RFC1001_NAME_LEN + 1)
  57
  58 /* currently length of NIP6_FMT */
  59 #define SERVER_NAME_LENGTH 40
  60 #define SERVER_NAME_LEN_WITH_NULL     (SERVER_NAME_LENGTH + 1)
  61
  62 /* used to define string lengths for reversing unicode strings */
  63 /*         (256+1)*2 = 514                                     */
  64 /*           (max path length + 1 for null) * 2 for unicode    */
  65 #define MAX_NAME 514
  66
  67 #include "cifspdu.h"
  68
  69 #ifndef XATTR_DOS_ATTRIB
  70 #define XATTR_DOS_ATTRIB "user.DOSATTRIB"
  71 #endif
  72
  73 /*
  74  * CIFS vfs client Status information (based on what we know.)
  75  */
  76
  77  /* associated with each tcp and smb session */
  78 enum statusEnum {
  79         CifsNew = 0,
  80         CifsGood,
  81         CifsExiting,
  82         CifsNeedReconnect
  83 };
  84
  85 enum securityEnum {
  86         LANMAN = 0,                     /* Legacy LANMAN auth */
  87         NTLM,                   /* Legacy NTLM012 auth with NTLM hash */
  88         NTLMv2,                 /* Legacy NTLM auth with NTLMv2 hash */
  89         RawNTLMSSP,             /* NTLMSSP without SPNEGO, NTLMv2 hash */
  90 /*      NTLMSSP, */ /* can use rawNTLMSSP instead of NTLMSSP via SPNEGO */
  91         Kerberos,               /* Kerberos via SPNEGO */
  92 };
  93
  94 enum protocolEnum {
  95         TCP = 0,
  96         SCTP
  97         /* Netbios frames protocol not supported at this time */
  98 };
  99
 100 struct mac_key {
 101         unsigned int len;
 102         union {
 103                 char ntlm[CIFS_SESS_KEY_SIZE + 16];
 104                 char krb5[CIFS_SESS_KEY_SIZE + 16]; /* BB: length correct? */
 105                 struct {
 106                         char key[16];
 107                         struct ntlmv2_resp resp;
 108                 } ntlmv2;
 109         } data;
 110 };
 111
 112 struct cifs_cred {
 113         int uid;
 114         int gid;
 115         int mode;
 116         int cecount;
 117         struct cifs_sid osid;
 118         struct cifs_sid gsid;
 119         struct cifs_ntace *ntaces;
 120         struct cifs_ace *aces;
 121 };
 122
 123 /*
 124  *****************************************************************
 125  * Except the CIFS PDUs themselves all the
 126  * globally interesting structs should go here
 127  *****************************************************************
 128  */
 129
 130 struct TCP_Server_Info {
 131         struct list_head tcp_ses_list;
 132         struct list_head smb_ses_list;
 133         int srv_count; /* reference counter */
 134         /* 15 character server name + 0x20 16th byte indicating type = srv */
 135         char server_RFC1001_name[RFC1001_NAME_LEN_WITH_NULL];
 136         char *hostname; /* hostname portion of UNC string */
 137         struct socket *ssocket;
 138         union {
 139                 struct sockaddr_in sockAddr;
 140                 struct sockaddr_in6 sockAddr6;
 141         } addr;
 142         wait_queue_head_t response_q;
 143         wait_queue_head_t request_q; /* if more than maxmpx to srvr must block*/
 144         struct list_head pending_mid_q;
 145         void *Server_NlsInfo;   /* BB - placeholder for future NLS info  */
 146         unsigned short server_codepage; /* codepage for the server    */
 147         enum protocolEnum protocolType;
 148         char versionMajor;
 149         char versionMinor;
 150         bool svlocal:1;                 /* local server or remote */
 151         bool noblocksnd;                /* use blocking sendmsg */
 152         bool noautotune;                /* do not autotune send buf sizes */
 153         bool tcp_nodelay;
 154         atomic_t inFlight;  /* number of requests on the wire to server */
 155 #ifdef CONFIG_CIFS_STATS2
 156         atomic_t inSend; /* requests trying to send */
 157         atomic_t num_waiters;   /* blocked waiting to get in sendrecv */
 158 #endif
 159         enum statusEnum tcpStatus; /* what we think the status is */
 160         struct mutex srv_mutex;
 161         struct task_struct *tsk;
 162         char server_GUID[16];
 163         char secMode;
 164         enum securityEnum secType;
 165         unsigned int maxReq;    /* Clients should submit no more */
 166         /* than maxReq distinct unanswered SMBs to the server when using  */
 167         /* multiplexed reads or writes */
 168         unsigned int maxBuf;    /* maxBuf specifies the maximum */
 169         /* message size the server can send or receive for non-raw SMBs */
 170         unsigned int max_rw;    /* maxRw specifies the maximum */
 171         /* message size the server can send or receive for */
 172         /* SMB_COM_WRITE_RAW or SMB_COM_READ_RAW. */
 173         unsigned int max_vcs;   /* maximum number of smb sessions, at least
 174                                    those that can be specified uniquely with
 175                                    vcnumbers */
 176         char sessid[4];         /* unique token id for this session */
 177         /* (returned on Negotiate */
 178         int capabilities; /* allow selective disabling of caps by smb sess */
 179         int timeAdj;  /* Adjust for difference in server time zone in sec */
 180         __u16 CurrentMid;         /* multiplex id - rotating counter */
 181         char cryptKey[CIFS_CRYPTO_KEY_SIZE];
 182         /* 16th byte of RFC1001 workstation name is always null */
 183         char workstation_RFC1001_name[RFC1001_NAME_LEN_WITH_NULL];
 184         __u32 sequence_number; /* needed for CIFS PDU signature */
 185         struct mac_key mac_signing_key;
 186         char ntlmv2_hash[16];
 187         unsigned long lstrp; /* when we got last response from this server */
 188         u16 dialect; /* dialect index that server chose */
 189         /* extended security flavors that server supports */
 190         bool    sec_kerberos;           /* supports plain Kerberos */
 191         bool    sec_mskerberos;         /* supports legacy MS Kerberos */
 192         bool    sec_kerberosu2u;        /* supports U2U Kerberos */
 193         bool    sec_ntlmssp;            /* supports NTLMSSP */
 194 #ifdef CONFIG_CIFS_FSCACHE
 195         struct fscache_cookie   *fscache; /* client index cache cookie */
 196 #endif
 197 };
 198
 199 /*
 200  * Session structure.  One of these for each uid session with a particular host
 201  */
 202 struct cifsSesInfo {
 203         struct list_head smb_ses_list;
 204         struct list_head tcon_list;
 205         struct mutex session_mutex;
 206         struct TCP_Server_Info *server; /* pointer to server info */
 207         int ses_count;          /* reference counter */
 208         enum statusEnum status;
 209         unsigned overrideSecFlg;  /* if non-zero override global sec flags */
 210         __u16 ipc_tid;          /* special tid for connection to IPC share */
 211         __u16 flags;
 212         __u16 vcnum;
 213         char *serverOS;         /* name of operating system underlying server */
 214         char *serverNOS;        /* name of network operating system of server */
 215         char *serverDomain;     /* security realm of server */
 216         int Suid;               /* remote smb uid  */
 217         uid_t linux_uid;        /* local Linux uid */
 218         int capabilities;
 219         char serverName[SERVER_NAME_LEN_WITH_NULL * 2]; /* BB make bigger for
 220                                 TCP names - will ipv6 and sctp addresses fit? */
 221         char userName[MAX_USERNAME_SIZE + 1];
 222         char *domainName;
 223         char *password;
 224         bool need_reconnect:1; /* connection reset, uid now invalid */
 225 };
 226 /* no more than one of the following three session flags may be set */
 227 #define CIFS_SES_NT4 1
 228 #define CIFS_SES_OS2 2
 229 #define CIFS_SES_W9X 4
 230 /* following flag is set for old servers such as OS2 (and Win95?)
 231    which do not negotiate NTLM or POSIX dialects, but instead
 232    negotiate one of the older LANMAN dialects */
 233 #define CIFS_SES_LANMAN 8
 234 /*
 235  * there is one of these for each connection to a resource on a particular
 236  * session
 237  */
 238 struct cifsTconInfo {
 239         struct list_head tcon_list;
 240         int tc_count;
 241         struct list_head openFileList;
 242         struct cifsSesInfo *ses;        /* pointer to session associated with */
 243         char treeName[MAX_TREE_SIZE + 1]; /* UNC name of resource in ASCII */
 244         char *nativeFileSystem;
 245         char *password;         /* for share-level security */
 246         __u16 tid;              /* The 2 byte tree id */
 247         __u16 Flags;            /* optional support bits */
 248         enum statusEnum tidStatus;
 249 #ifdef CONFIG_CIFS_STATS
 250         atomic_t num_smbs_sent;
 251         atomic_t num_writes;
 252         atomic_t num_reads;
 253         atomic_t num_flushes;
 254         atomic_t num_oplock_brks;
 255         atomic_t num_opens;
 256         atomic_t num_closes;
 257         atomic_t num_deletes;
 258         atomic_t num_mkdirs;
 259         atomic_t num_posixopens;
 260         atomic_t num_posixmkdirs;
 261         atomic_t num_rmdirs;
 262         atomic_t num_renames;
 263         atomic_t num_t2renames;
 264         atomic_t num_ffirst;
 265         atomic_t num_fnext;
 266         atomic_t num_fclose;
 267         atomic_t num_hardlinks;
 268         atomic_t num_symlinks;
 269         atomic_t num_locks;
 270         atomic_t num_acl_get;
 271         atomic_t num_acl_set;
 272 #ifdef CONFIG_CIFS_STATS2
 273         unsigned long long time_writes;
 274         unsigned long long time_reads;
 275         unsigned long long time_opens;
 276         unsigned long long time_deletes;
 277         unsigned long long time_closes;
 278         unsigned long long time_mkdirs;
 279         unsigned long long time_rmdirs;
 280         unsigned long long time_renames;
 281         unsigned long long time_t2renames;
 282         unsigned long long time_ffirst;
 283         unsigned long long time_fnext;
 284         unsigned long long time_fclose;
 285 #endif /* CONFIG_CIFS_STATS2 */
 286         __u64    bytes_read;
 287         __u64    bytes_written;
 288         spinlock_t stat_lock;
 289 #endif /* CONFIG_CIFS_STATS */
 290         FILE_SYSTEM_DEVICE_INFO fsDevInfo;
 291         FILE_SYSTEM_ATTRIBUTE_INFO fsAttrInfo; /* ok if fs name truncated */
 292         FILE_SYSTEM_UNIX_INFO fsUnixInfo;
 293         bool ipc:1;             /* set if connection to IPC$ eg for RPC/PIPES */
 294         bool retry:1;
 295         bool nocase:1;
 296         bool seal:1;      /* transport encryption for this mounted share */
 297         bool unix_ext:1;  /* if false disable Linux extensions to CIFS protocol
 298                                 for this mount even if server would support */
 299         bool local_lease:1; /* check leases (only) on local system not remote */
 300         bool broken_posix_open; /* e.g. Samba server versions < 3.3.2, 3.2.9 */
 301         bool need_reconnect:1; /* connection reset, tid now invalid */
 302 #ifdef CONFIG_CIFS_FSCACHE
 303         u64 resource_id;                /* server resource id */
 304         struct fscache_cookie *fscache; /* cookie for share */
 305 #endif
 306         /* BB add field for back pointer to sb struct(s)? */
 307 };
 308
 309 /*
 310  * This info hangs off the cifsFileInfo structure, pointed to by llist.
 311  * This is used to track byte stream locks on the file
 312  */
 313 struct cifsLockInfo {
 314         struct list_head llist; /* pointer to next cifsLockInfo */
 315         __u64 offset;
 316         __u64 length;
 317         __u8 type;
 318 };
 319
 320 /*
 321  * One of these for each open instance of a file
 322  */
 323 struct cifs_search_info {
 324         loff_t index_of_last_entry;
 325         __u16 entries_in_buffer;
 326         __u16 info_level;
 327         __u32 resume_key;
 328         char *ntwrk_buf_start;
 329         char *srch_entries_start;
 330         char *last_entry;
 331         char *presume_name;
 332         unsigned int resume_name_len;
 333         bool endOfSearch:1;
 334         bool emptyDir:1;
 335         bool unicode:1;
 336         bool smallBuf:1; /* so we know which buf_release function to call */
 337 };
 338
 339 struct cifsFileInfo {
 340         struct list_head tlist; /* pointer to next fid owned by tcon */
 341         struct list_head flist; /* next fid (file instance) for this inode */
 342         unsigned int uid;       /* allows finding which FileInfo structure */
 343         __u32 pid;              /* process id who opened file */
 344         __u16 netfid;           /* file id from remote */
 345         /* BB add lock scope info here if needed */ ;
 346         /* lock scope id (0 if none) */
 347         struct file *pfile; /* needed for writepage */
 348         struct inode *pInode; /* needed for oplock break */
 349         struct vfsmount *mnt;
 350         struct mutex lock_mutex;
 351         struct list_head llist; /* list of byte range locks we have. */
 352         bool closePend:1;       /* file is marked to close */
 353         bool invalidHandle:1;   /* file closed via session abend */
 354         bool oplock_break_cancelled:1;
 355         atomic_t count;         /* reference count */
 356         struct mutex fh_mutex; /* prevents reopen race after dead ses*/
 357         struct cifs_search_info srch_inf;
 358         struct slow_work oplock_break; /* slow_work job for oplock breaks */
 359 };
 360
 361 /* Take a reference on the file private data */
 362 static inline void cifsFileInfo_get(struct cifsFileInfo *cifs_file)
 363 {
 364         atomic_inc(&cifs_file->count);
 365 }
 366
 367 /* Release a reference on the file private data */
 368 static inline void cifsFileInfo_put(struct cifsFileInfo *cifs_file)
 369 {
 370         if (atomic_dec_and_test(&cifs_file->count)) {
 371                 iput(cifs_file->pInode);
 372                 kfree(cifs_file);
 373         }
 374 }
 375
 376 /*
 377  * One of these for each file inode
 378  */
 379
 380 struct cifsInodeInfo {
 381         struct list_head lockList;
 382         /* BB add in lists for dirty pages i.e. write caching info for oplock */
 383         struct list_head openFileList;
 384         int write_behind_rc;
 385         __u32 cifsAttrs; /* e.g. DOS archive bit, sparse, compressed, system */
 386         unsigned long time;     /* jiffies of last update/check of inode */
 387         bool clientCanCacheRead:1;      /* read oplock */
 388         bool clientCanCacheAll:1;       /* read and writebehind oplock */
 389         bool delete_pending:1;          /* DELETE_ON_CLOSE is set */
 390         bool invalid_mapping:1;         /* pagecache is invalid */
 391         u64  server_eof;                /* current file size on server */
 392         u64  uniqueid;                  /* server inode number */
 393         struct inode vfs_inode;
 394 };
 395
 396 static inline struct cifsInodeInfo *
 397 CIFS_I(struct inode *inode)
 398 {
 399         return container_of(inode, struct cifsInodeInfo, vfs_inode);
 400 }
 401
 402 static inline struct cifs_sb_info *
 403 CIFS_SB(struct super_block *sb)
 404 {
 405         return sb->s_fs_info;
 406 }
 407
 408 static inline char CIFS_DIR_SEP(const struct cifs_sb_info *cifs_sb)
 409 {
 410         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_POSIX_PATHS)
 411                 return '/';
 412         else
 413                 return '\\';
 414 }
 415
 416 #ifdef CONFIG_CIFS_STATS
 417 #define cifs_stats_inc atomic_inc
 418
 419 static inline void cifs_stats_bytes_written(struct cifsTconInfo *tcon,
 420                                             unsigned int bytes)
 421 {
 422         if (bytes) {
 423                 spin_lock(&tcon->stat_lock);
 424                 tcon->bytes_written += bytes;
 425                 spin_unlock(&tcon->stat_lock);
 426         }
 427 }
 428
 429 static inline void cifs_stats_bytes_read(struct cifsTconInfo *tcon,
 430                                          unsigned int bytes)
 431 {
 432         spin_lock(&tcon->stat_lock);
 433         tcon->bytes_read += bytes;
 434         spin_unlock(&tcon->stat_lock);
 435 }
 436 #else
 437
 438 #define  cifs_stats_inc(field) do {} while (0)
 439 #define  cifs_stats_bytes_written(tcon, bytes) do {} while (0)
 440 #define  cifs_stats_bytes_read(tcon, bytes) do {} while (0)
 441
 442 #endif
 443
 444 /* one of these for every pending CIFS request to the server */
 445 struct mid_q_entry {
 446         struct list_head qhead; /* mids waiting on reply from this server */
 447         __u16 mid;              /* multiplex id */
 448         __u16 pid;              /* process id */
 449         __u32 sequence_number;  /* for CIFS signing */
 450         unsigned long when_alloc;  /* when mid was created */
 451 #ifdef CONFIG_CIFS_STATS2
 452         unsigned long when_sent; /* time when smb send finished */
 453         unsigned long when_received; /* when demux complete (taken off wire) */
 454 #endif
 455         struct task_struct *tsk;        /* task waiting for response */
 456         struct smb_hdr *resp_buf;       /* response buffer */
 457         int midState;   /* wish this were enum but can not pass to wait_event */
 458         __u8 command;   /* smb command code */
 459         bool largeBuf:1;        /* if valid response, is pointer to large buf */
 460         bool multiRsp:1;        /* multiple trans2 responses for one request  */
 461         bool multiEnd:1;        /* both received */
 462 };
 463
 464 struct oplock_q_entry {
 465         struct list_head qhead;
 466         struct inode *pinode;
 467         struct cifsTconInfo *tcon;
 468         __u16 netfid;
 469 };
 470
 471 /* for pending dnotify requests */
 472 struct dir_notify_req {
 473        struct list_head lhead;
 474        __le16 Pid;
 475        __le16 PidHigh;
 476        __u16 Mid;
 477        __u16 Tid;
 478        __u16 Uid;
 479        __u16 netfid;
 480        __u32 filter; /* CompletionFilter (for multishot) */
 481        int multishot;
 482        struct file *pfile;
 483 };
 484
 485 struct dfs_info3_param {
 486         int flags; /* DFSREF_REFERRAL_SERVER, DFSREF_STORAGE_SERVER*/
 487         int path_consumed;
 488         int server_type;
 489         int ref_flag;
 490         char *path_name;
 491         char *node_name;
 492 };
 493
 494 /*
 495  * common struct for holding inode info when searching for or updating an
 496  * inode with new info
 497  */
 498
 499 #define CIFS_FATTR_DFS_REFERRAL         0x1
 500 #define CIFS_FATTR_DELETE_PENDING       0x2
 501 #define CIFS_FATTR_NEED_REVAL           0x4
 502 #define CIFS_FATTR_INO_COLLISION        0x8
 503
 504 struct cifs_fattr {
 505         u32             cf_flags;
 506         u32             cf_cifsattrs;
 507         u64             cf_uniqueid;
 508         u64             cf_eof;
 509         u64             cf_bytes;
 510         uid_t           cf_uid;
 511         gid_t           cf_gid;
 512         umode_t         cf_mode;
 513         dev_t           cf_rdev;
 514         unsigned int    cf_nlink;
 515         unsigned int    cf_dtype;
 516         struct timespec cf_atime;
 517         struct timespec cf_mtime;
 518         struct timespec cf_ctime;
 519 };
 520
 521 static inline void free_dfs_info_param(struct dfs_info3_param *param)
 522 {
 523         if (param) {
 524                 kfree(param->path_name);
 525                 kfree(param->node_name);
 526                 kfree(param);
 527         }
 528 }
 529
 530 static inline void free_dfs_info_array(struct dfs_info3_param *param,
 531                                        int number_of_items)
 532 {
 533         int i;
 534         if ((number_of_items == 0) || (param == NULL))
 535                 return;
 536         for (i = 0; i < number_of_items; i++) {
 537                 kfree(param[i].path_name);
 538                 kfree(param[i].node_name);
 539         }
 540         kfree(param);
 541 }
 542
 543 #define   MID_FREE 0
 544 #define   MID_REQUEST_ALLOCATED 1
 545 #define   MID_REQUEST_SUBMITTED 2
 546 #define   MID_RESPONSE_RECEIVED 4
 547 #define   MID_RETRY_NEEDED      8 /* session closed while this request out */
 548 #define   MID_NO_RESP_NEEDED 0x10
 549
 550 /* Types of response buffer returned from SendReceive2 */
 551 #define   CIFS_NO_BUFFER        0    /* Response buffer not returned */
 552 #define   CIFS_SMALL_BUFFER     1
 553 #define   CIFS_LARGE_BUFFER     2
 554 #define   CIFS_IOVEC            4    /* array of response buffers */
 555
 556 /* Type of Request to SendReceive2 */
 557 #define   CIFS_STD_OP           0    /* normal request timeout */
 558 #define   CIFS_LONG_OP          1    /* long op (up to 45 sec, oplock time) */
 559 #define   CIFS_VLONG_OP         2    /* sloow op - can take up to 180 seconds */
 560 #define   CIFS_BLOCKING_OP      4    /* operation can block */
 561 #define   CIFS_ASYNC_OP         8    /* do not wait for response */
 562 #define   CIFS_TIMEOUT_MASK 0x00F    /* only one of 5 above set in req */
 563 #define   CIFS_LOG_ERROR    0x010    /* log NT STATUS if non-zero */
 564 #define   CIFS_LARGE_BUF_OP 0x020    /* large request buffer */
 565 #define   CIFS_NO_RESP      0x040    /* no response buffer required */
 566
 567 /* Security Flags: indicate type of session setup needed */
 568 #define   CIFSSEC_MAY_SIGN      0x00001
 569 #define   CIFSSEC_MAY_NTLM      0x00002
 570 #define   CIFSSEC_MAY_NTLMV2    0x00004
 571 #define   CIFSSEC_MAY_KRB5      0x00008
 572 #ifdef CONFIG_CIFS_WEAK_PW_HASH
 573 #define   CIFSSEC_MAY_LANMAN    0x00010
 574 #define   CIFSSEC_MAY_PLNTXT    0x00020
 575 #else
 576 #define   CIFSSEC_MAY_LANMAN    0
 577 #define   CIFSSEC_MAY_PLNTXT    0
 578 #endif /* weak passwords */
 579 #define   CIFSSEC_MAY_SEAL      0x00040 /* not supported yet */
 580 #define   CIFSSEC_MAY_NTLMSSP   0x00080 /* raw ntlmssp with ntlmv2 */
 581
 582 #define   CIFSSEC_MUST_SIGN     0x01001
 583 /* note that only one of the following can be set so the
 584 result of setting MUST flags more than once will be to
 585 require use of the stronger protocol */
 586 #define   CIFSSEC_MUST_NTLM     0x02002
 587 #define   CIFSSEC_MUST_NTLMV2   0x04004
 588 #define   CIFSSEC_MUST_KRB5     0x08008
 589 #ifdef CONFIG_CIFS_WEAK_PW_HASH
 590 #define   CIFSSEC_MUST_LANMAN   0x10010
 591 #define   CIFSSEC_MUST_PLNTXT   0x20020
 592 #ifdef CONFIG_CIFS_UPCALL
 593 #define   CIFSSEC_MASK          0xBF0BF /* allows weak security but also krb5 */
 594 #else
 595 #define   CIFSSEC_MASK          0xB70B7 /* current flags supported if weak */
 596 #endif /* UPCALL */
 597 #else /* do not allow weak pw hash */
 598 #ifdef CONFIG_CIFS_UPCALL
 599 #define   CIFSSEC_MASK          0x8F08F /* flags supported if no weak allowed */
 600 #else
 601 #define   CIFSSEC_MASK          0x87087 /* flags supported if no weak allowed */
 602 #endif /* UPCALL */
 603 #endif /* WEAK_PW_HASH */
 604 #define   CIFSSEC_MUST_SEAL     0x40040 /* not supported yet */
 605 #define   CIFSSEC_MUST_NTLMSSP  0x80080 /* raw ntlmssp with ntlmv2 */
 606
 607 #define   CIFSSEC_DEF (CIFSSEC_MAY_SIGN | CIFSSEC_MAY_NTLM | CIFSSEC_MAY_NTLMV2)
 608 #define   CIFSSEC_MAX (CIFSSEC_MUST_SIGN | CIFSSEC_MUST_NTLMV2)
 609 #define   CIFSSEC_AUTH_MASK (CIFSSEC_MAY_NTLM | CIFSSEC_MAY_NTLMV2 | CIFSSEC_MAY_LANMAN | CIFSSEC_MAY_PLNTXT | CIFSSEC_MAY_KRB5 | CIFSSEC_MAY_NTLMSSP)
 610 /*
 611  *****************************************************************
 612  * All constants go here
 613  *****************************************************************
 614  */
 615
 616 #define UID_HASH (16)
 617
 618 /*
 619  * Note that ONE module should define _DECLARE_GLOBALS_HERE to cause the
 620  * following to be declared.
 621  */
 622
 623 /****************************************************************************
 624  *  Locking notes.  All updates to global variables and lists should be
 625  *                  protected by spinlocks or semaphores.
 626  *
 627  *  Spinlocks
 628  *  ---------
 629  *  GlobalMid_Lock protects:
 630  *      list operations on pending_mid_q and oplockQ
 631  *      updates to XID counters, multiplex id  and SMB sequence numbers
 632  *  GlobalSMBSesLock protects:
 633  *      list operations on tcp and SMB session lists and tCon lists
 634  *  f_owner.lock protects certain per file struct operations
 635  *  mapping->page_lock protects certain per page operations
 636  *
 637  *  Semaphores
 638  *  ----------
 639  *  sesSem     operations on smb session
 640  *  tconSem    operations on tree connection
 641  *  fh_sem      file handle reconnection operations
 642  *
 643  ****************************************************************************/
 644
 645 #ifdef DECLARE_GLOBALS_HERE
 646 #define GLOBAL_EXTERN
 647 #else
 648 #define GLOBAL_EXTERN extern
 649 #endif
 650
 651 /*
 652  * the list of TCP_Server_Info structures, ie each of the sockets
 653  * connecting our client to a distinct server (ip address), is
 654  * chained together by cifs_tcp_ses_list. The list of all our SMB
 655  * sessions (and from that the tree connections) can be found
 656  * by iterating over cifs_tcp_ses_list
 657  */
 658 GLOBAL_EXTERN struct list_head          cifs_tcp_ses_list;
 659
 660 /*
 661  * This lock protects the cifs_tcp_ses_list, the list of smb sessions per
 662  * tcp session, and the list of tcon's per smb session. It also protects
 663  * the reference counters for the server, smb session, and tcon. Finally,
 664  * changes to the tcon->tidStatus should be done while holding this lock.
 665  */
 666 GLOBAL_EXTERN rwlock_t          cifs_tcp_ses_lock;
 667
 668 /*
 669  * This lock protects the cifs_file->llist and cifs_file->flist
 670  * list operations, and updates to some flags (cifs_file->invalidHandle)
 671  * It will be moved to either use the tcon->stat_lock or equivalent later.
 672  * If cifs_tcp_ses_lock and the lock below are both needed to be held, then
 673  * the cifs_tcp_ses_lock must be grabbed first and released last.
 674  */
 675 GLOBAL_EXTERN rwlock_t GlobalSMBSeslock;
 676
 677 /* Outstanding dir notify requests */
 678 GLOBAL_EXTERN struct list_head GlobalDnotifyReqList;
 679 /* DirNotify response queue */
 680 GLOBAL_EXTERN struct list_head GlobalDnotifyRsp_Q;
 681
 682 /*
 683  * Global transaction id (XID) information
 684  */
 685 GLOBAL_EXTERN unsigned int GlobalCurrentXid;    /* protected by GlobalMid_Sem */
 686 GLOBAL_EXTERN unsigned int GlobalTotalActiveXid; /* prot by GlobalMid_Sem */
 687 GLOBAL_EXTERN unsigned int GlobalMaxActiveXid;  /* prot by GlobalMid_Sem */
 688 GLOBAL_EXTERN spinlock_t GlobalMid_Lock;  /* protects above & list operations */
 689                                           /* on midQ entries */
 690 GLOBAL_EXTERN char Local_System_Name[15];
 691
 692 /*
 693  *  Global counters, updated atomically
 694  */
 695 GLOBAL_EXTERN atomic_t sesInfoAllocCount;
 696 GLOBAL_EXTERN atomic_t tconInfoAllocCount;
 697 GLOBAL_EXTERN atomic_t tcpSesAllocCount;
 698 GLOBAL_EXTERN atomic_t tcpSesReconnectCount;
 699 GLOBAL_EXTERN atomic_t tconInfoReconnectCount;
 700
 701 /* Various Debug counters */
 702 GLOBAL_EXTERN atomic_t bufAllocCount;    /* current number allocated  */
 703 #ifdef CONFIG_CIFS_STATS2
 704 GLOBAL_EXTERN atomic_t totBufAllocCount; /* total allocated over all time */
 705 GLOBAL_EXTERN atomic_t totSmBufAllocCount;
 706 #endif
 707 GLOBAL_EXTERN atomic_t smBufAllocCount;
 708 GLOBAL_EXTERN atomic_t midCount;
 709
 710 /* Misc globals */
 711 GLOBAL_EXTERN unsigned int multiuser_mount; /* if enabled allows new sessions
 712                                 to be established on existing mount if we
 713                                 have the uid/password or Kerberos credential
 714                                 or equivalent for current user */
 715 GLOBAL_EXTERN unsigned int oplockEnabled;
 716 GLOBAL_EXTERN unsigned int experimEnabled;
 717 GLOBAL_EXTERN unsigned int lookupCacheEnabled;
 718 GLOBAL_EXTERN unsigned int global_secflags;     /* if on, session setup sent
 719                                 with more secure ntlmssp2 challenge/resp */
 720 GLOBAL_EXTERN unsigned int sign_CIFS_PDUs;  /* enable smb packet signing */
 721 GLOBAL_EXTERN unsigned int linuxExtEnabled;/*enable Linux/Unix CIFS extensions*/
 722 GLOBAL_EXTERN unsigned int CIFSMaxBufSize;  /* max size not including hdr */
 723 GLOBAL_EXTERN unsigned int cifs_min_rcv;    /* min size of big ntwrk buf pool */
 724 GLOBAL_EXTERN unsigned int cifs_min_small;  /* min size of small buf pool */
 725 GLOBAL_EXTERN unsigned int cifs_max_pending; /* MAX requests at once to server*/
 726
 727 extern const struct slow_work_ops cifs_oplock_break_ops;
 728
 729 #endif  /* _CIFS_GLOB_H */