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/workqueue.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 session_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         struct sockaddr_storage srcaddr; /* locally bind to this IP */
 143         wait_queue_head_t response_q;
 144         wait_queue_head_t request_q; /* if more than maxmpx to srvr must block*/
 145         struct list_head pending_mid_q;
 146         void *Server_NlsInfo;   /* BB - placeholder for future NLS info  */
 147         unsigned short server_codepage; /* codepage for the server    */
 148         enum protocolEnum protocolType;
 149         char versionMajor;
 150         char versionMinor;
 151         bool svlocal:1;                 /* local server or remote */
 152         bool noblocksnd;                /* use blocking sendmsg */
 153         bool noautotune;                /* do not autotune send buf sizes */
 154         bool tcp_nodelay;
 155         atomic_t inFlight;  /* number of requests on the wire to server */
 156 #ifdef CONFIG_CIFS_STATS2
 157         atomic_t inSend; /* requests trying to send */
 158         atomic_t num_waiters;   /* blocked waiting to get in sendrecv */
 159 #endif
 160         enum statusEnum tcpStatus; /* what we think the status is */
 161         struct mutex srv_mutex;
 162         struct task_struct *tsk;
 163         char server_GUID[16];
 164         char secMode;
 165         enum securityEnum secType;
 166         unsigned int maxReq;    /* Clients should submit no more */
 167         /* than maxReq distinct unanswered SMBs to the server when using  */
 168         /* multiplexed reads or writes */
 169         unsigned int maxBuf;    /* maxBuf specifies the maximum */
 170         /* message size the server can send or receive for non-raw SMBs */
 171         unsigned int max_rw;    /* maxRw specifies the maximum */
 172         /* message size the server can send or receive for */
 173         /* SMB_COM_WRITE_RAW or SMB_COM_READ_RAW. */
 174         unsigned int max_vcs;   /* maximum number of smb sessions, at least
 175                                    those that can be specified uniquely with
 176                                    vcnumbers */
 177         char sessid[4];         /* unique token id for this session */
 178         /* (returned on Negotiate */
 179         int capabilities; /* allow selective disabling of caps by smb sess */
 180         int timeAdj;  /* Adjust for difference in server time zone in sec */
 181         __u16 CurrentMid;         /* multiplex id - rotating counter */
 182         char cryptKey[CIFS_CRYPTO_KEY_SIZE];
 183         /* 16th byte of RFC1001 workstation name is always null */
 184         char workstation_RFC1001_name[RFC1001_NAME_LEN_WITH_NULL];
 185         __u32 sequence_number; /* needed for CIFS PDU signature */
 186         struct session_key session_key;
 187         char ntlmv2_hash[16];
 188         unsigned long lstrp; /* when we got last response from this server */
 189         u16 dialect; /* dialect index that server chose */
 190         /* extended security flavors that server supports */
 191         bool    sec_kerberos;           /* supports plain Kerberos */
 192         bool    sec_mskerberos;         /* supports legacy MS Kerberos */
 193         bool    sec_kerberosu2u;        /* supports U2U Kerberos */
 194         bool    sec_ntlmssp;            /* supports NTLMSSP */
 195 #ifdef CONFIG_CIFS_FSCACHE
 196         struct fscache_cookie   *fscache; /* client index cache cookie */
 197 #endif
 198 };
 199
 200 /*
 201  * Session structure.  One of these for each uid session with a particular host
 202  */
 203 struct cifsSesInfo {
 204         struct list_head smb_ses_list;
 205         struct list_head tcon_list;
 206         struct mutex session_mutex;
 207         struct TCP_Server_Info *server; /* pointer to server info */
 208         int ses_count;          /* reference counter */
 209         enum statusEnum status;
 210         unsigned overrideSecFlg;  /* if non-zero override global sec flags */
 211         __u16 ipc_tid;          /* special tid for connection to IPC share */
 212         __u16 flags;
 213         __u16 vcnum;
 214         char *serverOS;         /* name of operating system underlying server */
 215         char *serverNOS;        /* name of network operating system of server */
 216         char *serverDomain;     /* security realm of server */
 217         int Suid;               /* remote smb uid  */
 218         uid_t linux_uid;        /* overriding owner of files on the mount */
 219         uid_t cred_uid;         /* owner of credentials */
 220         int capabilities;
 221         char serverName[SERVER_NAME_LEN_WITH_NULL * 2]; /* BB make bigger for
 222                                 TCP names - will ipv6 and sctp addresses fit? */
 223         char userName[MAX_USERNAME_SIZE + 1];
 224         char *domainName;
 225         char *password;
 226         unsigned int tilen; /* length of the target info blob */
 227         unsigned char *tiblob; /* target info blob in challenge response */
 228         bool need_reconnect:1; /* connection reset, uid now invalid */
 229 };
 230 /* no more than one of the following three session flags may be set */
 231 #define CIFS_SES_NT4 1
 232 #define CIFS_SES_OS2 2
 233 #define CIFS_SES_W9X 4
 234 /* following flag is set for old servers such as OS2 (and Win95?)
 235    which do not negotiate NTLM or POSIX dialects, but instead
 236    negotiate one of the older LANMAN dialects */
 237 #define CIFS_SES_LANMAN 8
 238 /*
 239  * there is one of these for each connection to a resource on a particular
 240  * session
 241  */
 242 struct cifsTconInfo {
 243         struct list_head tcon_list;
 244         int tc_count;
 245         struct list_head openFileList;
 246         struct cifsSesInfo *ses;        /* pointer to session associated with */
 247         char treeName[MAX_TREE_SIZE + 1]; /* UNC name of resource in ASCII */
 248         char *nativeFileSystem;
 249         char *password;         /* for share-level security */
 250         __u16 tid;              /* The 2 byte tree id */
 251         __u16 Flags;            /* optional support bits */
 252         enum statusEnum tidStatus;
 253 #ifdef CONFIG_CIFS_STATS
 254         atomic_t num_smbs_sent;
 255         atomic_t num_writes;
 256         atomic_t num_reads;
 257         atomic_t num_flushes;
 258         atomic_t num_oplock_brks;
 259         atomic_t num_opens;
 260         atomic_t num_closes;
 261         atomic_t num_deletes;
 262         atomic_t num_mkdirs;
 263         atomic_t num_posixopens;
 264         atomic_t num_posixmkdirs;
 265         atomic_t num_rmdirs;
 266         atomic_t num_renames;
 267         atomic_t num_t2renames;
 268         atomic_t num_ffirst;
 269         atomic_t num_fnext;
 270         atomic_t num_fclose;
 271         atomic_t num_hardlinks;
 272         atomic_t num_symlinks;
 273         atomic_t num_locks;
 274         atomic_t num_acl_get;
 275         atomic_t num_acl_set;
 276 #ifdef CONFIG_CIFS_STATS2
 277         unsigned long long time_writes;
 278         unsigned long long time_reads;
 279         unsigned long long time_opens;
 280         unsigned long long time_deletes;
 281         unsigned long long time_closes;
 282         unsigned long long time_mkdirs;
 283         unsigned long long time_rmdirs;
 284         unsigned long long time_renames;
 285         unsigned long long time_t2renames;
 286         unsigned long long time_ffirst;
 287         unsigned long long time_fnext;
 288         unsigned long long time_fclose;
 289 #endif /* CONFIG_CIFS_STATS2 */
 290         __u64    bytes_read;
 291         __u64    bytes_written;
 292         spinlock_t stat_lock;
 293 #endif /* CONFIG_CIFS_STATS */
 294         FILE_SYSTEM_DEVICE_INFO fsDevInfo;
 295         FILE_SYSTEM_ATTRIBUTE_INFO fsAttrInfo; /* ok if fs name truncated */
 296         FILE_SYSTEM_UNIX_INFO fsUnixInfo;
 297         bool ipc:1;             /* set if connection to IPC$ eg for RPC/PIPES */
 298         bool retry:1;
 299         bool nocase:1;
 300         bool seal:1;      /* transport encryption for this mounted share */
 301         bool unix_ext:1;  /* if false disable Linux extensions to CIFS protocol
 302                                 for this mount even if server would support */
 303         bool local_lease:1; /* check leases (only) on local system not remote */
 304         bool broken_posix_open; /* e.g. Samba server versions < 3.3.2, 3.2.9 */
 305         bool need_reconnect:1; /* connection reset, tid now invalid */
 306 #ifdef CONFIG_CIFS_FSCACHE
 307         u64 resource_id;                /* server resource id */
 308         struct fscache_cookie *fscache; /* cookie for share */
 309 #endif
 310         /* BB add field for back pointer to sb struct(s)? */
 311 };
 312
 313 /*
 314  * This is a refcounted and timestamped container for a tcon pointer. The
 315  * container holds a tcon reference. It is considered safe to free one of
 316  * these when the tl_count goes to 0. The tl_time is the time of the last
 317  * "get" on the container.
 318  */
 319 struct tcon_link {
 320         spinlock_t              tl_lock;
 321         u32                     tl_count;
 322         u64                     tl_time;
 323         struct cifsTconInfo     *tl_tcon;
 324 };
 325
 326 static inline struct tcon_link *
 327 cifs_sb_tlink(struct cifs_sb_info *cifs_sb)
 328 {
 329         return (struct tcon_link *)cifs_sb->ptcon;
 330 }
 331
 332 static inline struct cifsTconInfo *
 333 tlink_tcon(struct tcon_link *tlink)
 334 {
 335         return (struct cifsTconInfo *)tlink;
 336 }
 337
 338 static inline void
 339 cifs_put_tlink(struct tcon_link *tlink)
 340 {
 341         return;
 342 }
 343
 344 /* This function is always expected to succeed */
 345 static inline struct cifsTconInfo *
 346 cifs_sb_master_tcon(struct cifs_sb_info *cifs_sb)
 347 {
 348         return cifs_sb->ptcon;
 349 }
 350
 351 /*
 352  * This info hangs off the cifsFileInfo structure, pointed to by llist.
 353  * This is used to track byte stream locks on the file
 354  */
 355 struct cifsLockInfo {
 356         struct list_head llist; /* pointer to next cifsLockInfo */
 357         __u64 offset;
 358         __u64 length;
 359         __u8 type;
 360 };
 361
 362 /*
 363  * One of these for each open instance of a file
 364  */
 365 struct cifs_search_info {
 366         loff_t index_of_last_entry;
 367         __u16 entries_in_buffer;
 368         __u16 info_level;
 369         __u32 resume_key;
 370         char *ntwrk_buf_start;
 371         char *srch_entries_start;
 372         char *last_entry;
 373         char *presume_name;
 374         unsigned int resume_name_len;
 375         bool endOfSearch:1;
 376         bool emptyDir:1;
 377         bool unicode:1;
 378         bool smallBuf:1; /* so we know which buf_release function to call */
 379 };
 380
 381 struct cifsFileInfo {
 382         struct list_head tlist; /* pointer to next fid owned by tcon */
 383         struct list_head flist; /* next fid (file instance) for this inode */
 384         unsigned int uid;       /* allows finding which FileInfo structure */
 385         __u32 pid;              /* process id who opened file */
 386         __u16 netfid;           /* file id from remote */
 387         /* BB add lock scope info here if needed */ ;
 388         /* lock scope id (0 if none) */
 389         struct file *pfile; /* needed for writepage */
 390         struct inode *pInode; /* needed for oplock break */
 391         struct vfsmount *mnt;
 392         struct cifsTconInfo *tcon;
 393         struct mutex lock_mutex;
 394         struct list_head llist; /* list of byte range locks we have. */
 395         bool closePend:1;       /* file is marked to close */
 396         bool invalidHandle:1;   /* file closed via session abend */
 397         bool oplock_break_cancelled:1;
 398         atomic_t count;         /* reference count */
 399         struct mutex fh_mutex; /* prevents reopen race after dead ses*/
 400         struct cifs_search_info srch_inf;
 401         struct work_struct oplock_break; /* work for oplock breaks */
 402 };
 403
 404 /* Take a reference on the file private data */
 405 static inline void cifsFileInfo_get(struct cifsFileInfo *cifs_file)
 406 {
 407         atomic_inc(&cifs_file->count);
 408 }
 409
 410 /* Release a reference on the file private data */
 411 static inline void cifsFileInfo_put(struct cifsFileInfo *cifs_file)
 412 {
 413         if (atomic_dec_and_test(&cifs_file->count)) {
 414                 iput(cifs_file->pInode);
 415                 kfree(cifs_file);
 416         }
 417 }
 418
 419 /*
 420  * One of these for each file inode
 421  */
 422
 423 struct cifsInodeInfo {
 424         struct list_head lockList;
 425         /* BB add in lists for dirty pages i.e. write caching info for oplock */
 426         struct list_head openFileList;
 427         int write_behind_rc;
 428         __u32 cifsAttrs; /* e.g. DOS archive bit, sparse, compressed, system */
 429         unsigned long time;     /* jiffies of last update/check of inode */
 430         bool clientCanCacheRead:1;      /* read oplock */
 431         bool clientCanCacheAll:1;       /* read and writebehind oplock */
 432         bool delete_pending:1;          /* DELETE_ON_CLOSE is set */
 433         bool invalid_mapping:1;         /* pagecache is invalid */
 434         u64  server_eof;                /* current file size on server */
 435         u64  uniqueid;                  /* server inode number */
 436 #ifdef CONFIG_CIFS_FSCACHE
 437         struct fscache_cookie *fscache;
 438 #endif
 439         struct inode vfs_inode;
 440 };
 441
 442 static inline struct cifsInodeInfo *
 443 CIFS_I(struct inode *inode)
 444 {
 445         return container_of(inode, struct cifsInodeInfo, vfs_inode);
 446 }
 447
 448 static inline struct cifs_sb_info *
 449 CIFS_SB(struct super_block *sb)
 450 {
 451         return sb->s_fs_info;
 452 }
 453
 454 static inline char CIFS_DIR_SEP(const struct cifs_sb_info *cifs_sb)
 455 {
 456         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_POSIX_PATHS)
 457                 return '/';
 458         else
 459                 return '\\';
 460 }
 461
 462 #ifdef CONFIG_CIFS_STATS
 463 #define cifs_stats_inc atomic_inc
 464
 465 static inline void cifs_stats_bytes_written(struct cifsTconInfo *tcon,
 466                                             unsigned int bytes)
 467 {
 468         if (bytes) {
 469                 spin_lock(&tcon->stat_lock);
 470                 tcon->bytes_written += bytes;
 471                 spin_unlock(&tcon->stat_lock);
 472         }
 473 }
 474
 475 static inline void cifs_stats_bytes_read(struct cifsTconInfo *tcon,
 476                                          unsigned int bytes)
 477 {
 478         spin_lock(&tcon->stat_lock);
 479         tcon->bytes_read += bytes;
 480         spin_unlock(&tcon->stat_lock);
 481 }
 482 #else
 483
 484 #define  cifs_stats_inc(field) do {} while (0)
 485 #define  cifs_stats_bytes_written(tcon, bytes) do {} while (0)
 486 #define  cifs_stats_bytes_read(tcon, bytes) do {} while (0)
 487
 488 #endif
 489
 490 /* one of these for every pending CIFS request to the server */
 491 struct mid_q_entry {
 492         struct list_head qhead; /* mids waiting on reply from this server */
 493         __u16 mid;              /* multiplex id */
 494         __u16 pid;              /* process id */
 495         __u32 sequence_number;  /* for CIFS signing */
 496         unsigned long when_alloc;  /* when mid was created */
 497 #ifdef CONFIG_CIFS_STATS2
 498         unsigned long when_sent; /* time when smb send finished */
 499         unsigned long when_received; /* when demux complete (taken off wire) */
 500 #endif
 501         struct task_struct *tsk;        /* task waiting for response */
 502         struct smb_hdr *resp_buf;       /* response buffer */
 503         int midState;   /* wish this were enum but can not pass to wait_event */
 504         __u8 command;   /* smb command code */
 505         bool largeBuf:1;        /* if valid response, is pointer to large buf */
 506         bool multiRsp:1;        /* multiple trans2 responses for one request  */
 507         bool multiEnd:1;        /* both received */
 508 };
 509
 510 struct oplock_q_entry {
 511         struct list_head qhead;
 512         struct inode *pinode;
 513         struct cifsTconInfo *tcon;
 514         __u16 netfid;
 515 };
 516
 517 /* for pending dnotify requests */
 518 struct dir_notify_req {
 519        struct list_head lhead;
 520        __le16 Pid;
 521        __le16 PidHigh;
 522        __u16 Mid;
 523        __u16 Tid;
 524        __u16 Uid;
 525        __u16 netfid;
 526        __u32 filter; /* CompletionFilter (for multishot) */
 527        int multishot;
 528        struct file *pfile;
 529 };
 530
 531 struct dfs_info3_param {
 532         int flags; /* DFSREF_REFERRAL_SERVER, DFSREF_STORAGE_SERVER*/
 533         int path_consumed;
 534         int server_type;
 535         int ref_flag;
 536         char *path_name;
 537         char *node_name;
 538 };
 539
 540 /*
 541  * common struct for holding inode info when searching for or updating an
 542  * inode with new info
 543  */
 544
 545 #define CIFS_FATTR_DFS_REFERRAL         0x1
 546 #define CIFS_FATTR_DELETE_PENDING       0x2
 547 #define CIFS_FATTR_NEED_REVAL           0x4
 548 #define CIFS_FATTR_INO_COLLISION        0x8
 549
 550 struct cifs_fattr {
 551         u32             cf_flags;
 552         u32             cf_cifsattrs;
 553         u64             cf_uniqueid;
 554         u64             cf_eof;
 555         u64             cf_bytes;
 556         uid_t           cf_uid;
 557         gid_t           cf_gid;
 558         umode_t         cf_mode;
 559         dev_t           cf_rdev;
 560         unsigned int    cf_nlink;
 561         unsigned int    cf_dtype;
 562         struct timespec cf_atime;
 563         struct timespec cf_mtime;
 564         struct timespec cf_ctime;
 565 };
 566
 567 static inline void free_dfs_info_param(struct dfs_info3_param *param)
 568 {
 569         if (param) {
 570                 kfree(param->path_name);
 571                 kfree(param->node_name);
 572                 kfree(param);
 573         }
 574 }
 575
 576 static inline void free_dfs_info_array(struct dfs_info3_param *param,
 577                                        int number_of_items)
 578 {
 579         int i;
 580         if ((number_of_items == 0) || (param == NULL))
 581                 return;
 582         for (i = 0; i < number_of_items; i++) {
 583                 kfree(param[i].path_name);
 584                 kfree(param[i].node_name);
 585         }
 586         kfree(param);
 587 }
 588
 589 #define   MID_FREE 0
 590 #define   MID_REQUEST_ALLOCATED 1
 591 #define   MID_REQUEST_SUBMITTED 2
 592 #define   MID_RESPONSE_RECEIVED 4
 593 #define   MID_RETRY_NEEDED      8 /* session closed while this request out */
 594 #define   MID_NO_RESP_NEEDED 0x10
 595
 596 /* Types of response buffer returned from SendReceive2 */
 597 #define   CIFS_NO_BUFFER        0    /* Response buffer not returned */
 598 #define   CIFS_SMALL_BUFFER     1
 599 #define   CIFS_LARGE_BUFFER     2
 600 #define   CIFS_IOVEC            4    /* array of response buffers */
 601
 602 /* Type of Request to SendReceive2 */
 603 #define   CIFS_STD_OP           0    /* normal request timeout */
 604 #define   CIFS_LONG_OP          1    /* long op (up to 45 sec, oplock time) */
 605 #define   CIFS_VLONG_OP         2    /* sloow op - can take up to 180 seconds */
 606 #define   CIFS_BLOCKING_OP      4    /* operation can block */
 607 #define   CIFS_ASYNC_OP         8    /* do not wait for response */
 608 #define   CIFS_TIMEOUT_MASK 0x00F    /* only one of 5 above set in req */
 609 #define   CIFS_LOG_ERROR    0x010    /* log NT STATUS if non-zero */
 610 #define   CIFS_LARGE_BUF_OP 0x020    /* large request buffer */
 611 #define   CIFS_NO_RESP      0x040    /* no response buffer required */
 612
 613 /* Security Flags: indicate type of session setup needed */
 614 #define   CIFSSEC_MAY_SIGN      0x00001
 615 #define   CIFSSEC_MAY_NTLM      0x00002
 616 #define   CIFSSEC_MAY_NTLMV2    0x00004
 617 #define   CIFSSEC_MAY_KRB5      0x00008
 618 #ifdef CONFIG_CIFS_WEAK_PW_HASH
 619 #define   CIFSSEC_MAY_LANMAN    0x00010
 620 #define   CIFSSEC_MAY_PLNTXT    0x00020
 621 #else
 622 #define   CIFSSEC_MAY_LANMAN    0
 623 #define   CIFSSEC_MAY_PLNTXT    0
 624 #endif /* weak passwords */
 625 #define   CIFSSEC_MAY_SEAL      0x00040 /* not supported yet */
 626 #define   CIFSSEC_MAY_NTLMSSP   0x00080 /* raw ntlmssp with ntlmv2 */
 627
 628 #define   CIFSSEC_MUST_SIGN     0x01001
 629 /* note that only one of the following can be set so the
 630 result of setting MUST flags more than once will be to
 631 require use of the stronger protocol */
 632 #define   CIFSSEC_MUST_NTLM     0x02002
 633 #define   CIFSSEC_MUST_NTLMV2   0x04004
 634 #define   CIFSSEC_MUST_KRB5     0x08008
 635 #ifdef CONFIG_CIFS_WEAK_PW_HASH
 636 #define   CIFSSEC_MUST_LANMAN   0x10010
 637 #define   CIFSSEC_MUST_PLNTXT   0x20020
 638 #ifdef CONFIG_CIFS_UPCALL
 639 #define   CIFSSEC_MASK          0xBF0BF /* allows weak security but also krb5 */
 640 #else
 641 #define   CIFSSEC_MASK          0xB70B7 /* current flags supported if weak */
 642 #endif /* UPCALL */
 643 #else /* do not allow weak pw hash */
 644 #ifdef CONFIG_CIFS_UPCALL
 645 #define   CIFSSEC_MASK          0x8F08F /* flags supported if no weak allowed */
 646 #else
 647 #define   CIFSSEC_MASK          0x87087 /* flags supported if no weak allowed */
 648 #endif /* UPCALL */
 649 #endif /* WEAK_PW_HASH */
 650 #define   CIFSSEC_MUST_SEAL     0x40040 /* not supported yet */
 651 #define   CIFSSEC_MUST_NTLMSSP  0x80080 /* raw ntlmssp with ntlmv2 */
 652
 653 #define   CIFSSEC_DEF (CIFSSEC_MAY_SIGN | CIFSSEC_MAY_NTLM | CIFSSEC_MAY_NTLMV2)
 654 #define   CIFSSEC_MAX (CIFSSEC_MUST_SIGN | CIFSSEC_MUST_NTLMV2)
 655 #define   CIFSSEC_AUTH_MASK (CIFSSEC_MAY_NTLM | CIFSSEC_MAY_NTLMV2 | CIFSSEC_MAY_LANMAN | CIFSSEC_MAY_PLNTXT | CIFSSEC_MAY_KRB5 | CIFSSEC_MAY_NTLMSSP)
 656 /*
 657  *****************************************************************
 658  * All constants go here
 659  *****************************************************************
 660  */
 661
 662 #define UID_HASH (16)
 663
 664 /*
 665  * Note that ONE module should define _DECLARE_GLOBALS_HERE to cause the
 666  * following to be declared.
 667  */
 668
 669 /****************************************************************************
 670  *  Locking notes.  All updates to global variables and lists should be
 671  *                  protected by spinlocks or semaphores.
 672  *
 673  *  Spinlocks
 674  *  ---------
 675  *  GlobalMid_Lock protects:
 676  *      list operations on pending_mid_q and oplockQ
 677  *      updates to XID counters, multiplex id  and SMB sequence numbers
 678  *  GlobalSMBSesLock protects:
 679  *      list operations on tcp and SMB session lists and tCon lists
 680  *  f_owner.lock protects certain per file struct operations
 681  *  mapping->page_lock protects certain per page operations
 682  *
 683  *  Semaphores
 684  *  ----------
 685  *  sesSem     operations on smb session
 686  *  tconSem    operations on tree connection
 687  *  fh_sem      file handle reconnection operations
 688  *
 689  ****************************************************************************/
 690
 691 #ifdef DECLARE_GLOBALS_HERE
 692 #define GLOBAL_EXTERN
 693 #else
 694 #define GLOBAL_EXTERN extern
 695 #endif
 696
 697 /*
 698  * the list of TCP_Server_Info structures, ie each of the sockets
 699  * connecting our client to a distinct server (ip address), is
 700  * chained together by cifs_tcp_ses_list. The list of all our SMB
 701  * sessions (and from that the tree connections) can be found
 702  * by iterating over cifs_tcp_ses_list
 703  */
 704 GLOBAL_EXTERN struct list_head          cifs_tcp_ses_list;
 705
 706 /*
 707  * This lock protects the cifs_tcp_ses_list, the list of smb sessions per
 708  * tcp session, and the list of tcon's per smb session. It also protects
 709  * the reference counters for the server, smb session, and tcon. Finally,
 710  * changes to the tcon->tidStatus should be done while holding this lock.
 711  */
 712 GLOBAL_EXTERN rwlock_t          cifs_tcp_ses_lock;
 713
 714 /*
 715  * This lock protects the cifs_file->llist and cifs_file->flist
 716  * list operations, and updates to some flags (cifs_file->invalidHandle)
 717  * It will be moved to either use the tcon->stat_lock or equivalent later.
 718  * If cifs_tcp_ses_lock and the lock below are both needed to be held, then
 719  * the cifs_tcp_ses_lock must be grabbed first and released last.
 720  */
 721 GLOBAL_EXTERN rwlock_t GlobalSMBSeslock;
 722
 723 /* Outstanding dir notify requests */
 724 GLOBAL_EXTERN struct list_head GlobalDnotifyReqList;
 725 /* DirNotify response queue */
 726 GLOBAL_EXTERN struct list_head GlobalDnotifyRsp_Q;
 727
 728 /*
 729  * Global transaction id (XID) information
 730  */
 731 GLOBAL_EXTERN unsigned int GlobalCurrentXid;    /* protected by GlobalMid_Sem */
 732 GLOBAL_EXTERN unsigned int GlobalTotalActiveXid; /* prot by GlobalMid_Sem */
 733 GLOBAL_EXTERN unsigned int GlobalMaxActiveXid;  /* prot by GlobalMid_Sem */
 734 GLOBAL_EXTERN spinlock_t GlobalMid_Lock;  /* protects above & list operations */
 735                                           /* on midQ entries */
 736 GLOBAL_EXTERN char Local_System_Name[15];
 737
 738 /*
 739  *  Global counters, updated atomically
 740  */
 741 GLOBAL_EXTERN atomic_t sesInfoAllocCount;
 742 GLOBAL_EXTERN atomic_t tconInfoAllocCount;
 743 GLOBAL_EXTERN atomic_t tcpSesAllocCount;
 744 GLOBAL_EXTERN atomic_t tcpSesReconnectCount;
 745 GLOBAL_EXTERN atomic_t tconInfoReconnectCount;
 746
 747 /* Various Debug counters */
 748 GLOBAL_EXTERN atomic_t bufAllocCount;    /* current number allocated  */
 749 #ifdef CONFIG_CIFS_STATS2
 750 GLOBAL_EXTERN atomic_t totBufAllocCount; /* total allocated over all time */
 751 GLOBAL_EXTERN atomic_t totSmBufAllocCount;
 752 #endif
 753 GLOBAL_EXTERN atomic_t smBufAllocCount;
 754 GLOBAL_EXTERN atomic_t midCount;
 755
 756 /* Misc globals */
 757 GLOBAL_EXTERN unsigned int multiuser_mount; /* if enabled allows new sessions
 758                                 to be established on existing mount if we
 759                                 have the uid/password or Kerberos credential
 760                                 or equivalent for current user */
 761 GLOBAL_EXTERN unsigned int oplockEnabled;
 762 GLOBAL_EXTERN unsigned int experimEnabled;
 763 GLOBAL_EXTERN unsigned int lookupCacheEnabled;
 764 GLOBAL_EXTERN unsigned int global_secflags;     /* if on, session setup sent
 765                                 with more secure ntlmssp2 challenge/resp */
 766 GLOBAL_EXTERN unsigned int sign_CIFS_PDUs;  /* enable smb packet signing */
 767 GLOBAL_EXTERN unsigned int linuxExtEnabled;/*enable Linux/Unix CIFS extensions*/
 768 GLOBAL_EXTERN unsigned int CIFSMaxBufSize;  /* max size not including hdr */
 769 GLOBAL_EXTERN unsigned int cifs_min_rcv;    /* min size of big ntwrk buf pool */
 770 GLOBAL_EXTERN unsigned int cifs_min_small;  /* min size of small buf pool */
 771 GLOBAL_EXTERN unsigned int cifs_max_pending; /* MAX requests at once to server*/
 772
 773 void cifs_oplock_break(struct work_struct *work);
 774 void cifs_oplock_break_get(struct cifsFileInfo *cfile);
 775 void cifs_oplock_break_put(struct cifsFileInfo *cfile);
 776
 777 extern const struct slow_work_ops cifs_oplock_break_ops;
 778
 779 #endif  /* _CIFS_GLOB_H */