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 #include <linux/in.h>
  20 #include <linux/in6.h>
  21 #include "cifs_fs_sb.h"
  22 #include "cifsacl.h"
  23 /*
  24  * The sizes of various internal tables and strings
  25  */
  26 #define MAX_UID_INFO 16
  27 #define MAX_SES_INFO 2
  28 #define MAX_TCON_INFO 4
  29
  30 #define MAX_TREE_SIZE (2 + MAX_SERVER_SIZE + 1 + MAX_SHARE_SIZE + 1)
  31 #define MAX_SERVER_SIZE 15
  32 #define MAX_SHARE_SIZE  64      /* used to be 20, this should still be enough */
  33 #define MAX_USERNAME_SIZE 32    /* 32 is to allow for 15 char names + null
  34                                    termination then *2 for unicode versions */
  35 #define MAX_PASSWORD_SIZE 16
  36
  37 #define CIFS_MIN_RCV_POOL 4
  38
  39 /*
  40  * MAX_REQ is the maximum number of requests that WE will send
  41  * on one socket concurently. It also matches the most common
  42  * value of max multiplex returned by servers.  We may
  43  * eventually want to use the negotiated value (in case
  44  * future servers can handle more) when we are more confident that
  45  * we will not have problems oveloading the socket with pending
  46  * write data.
  47  */
  48 #define CIFS_MAX_REQ 50
  49
  50 #define RFC1001_NAME_LEN 15
  51 #define RFC1001_NAME_LEN_WITH_NULL (RFC1001_NAME_LEN + 1)
  52
  53 /* currently length of NIP6_FMT */
  54 #define SERVER_NAME_LENGTH 40
  55 #define SERVER_NAME_LEN_WITH_NULL     (SERVER_NAME_LENGTH + 1)
  56
  57 /* used to define string lengths for reversing unicode strings */
  58 /*         (256+1)*2 = 514                                     */
  59 /*           (max path length + 1 for null) * 2 for unicode    */
  60 #define MAX_NAME 514
  61
  62 #include "cifspdu.h"
  63
  64 #ifndef XATTR_DOS_ATTRIB
  65 #define XATTR_DOS_ATTRIB "user.DOSATTRIB"
  66 #endif
  67
  68 /*
  69  * CIFS vfs client Status information (based on what we know.)
  70  */
  71
  72  /* associated with each tcp and smb session */
  73 enum statusEnum {
  74         CifsNew = 0,
  75         CifsGood,
  76         CifsExiting,
  77         CifsNeedReconnect
  78 };
  79
  80 enum securityEnum {
  81         PLAINTXT = 0,           /* Legacy with Plaintext passwords */
  82         LANMAN,                 /* Legacy LANMAN auth */
  83         NTLM,                   /* Legacy NTLM012 auth with NTLM hash */
  84         NTLMv2,                 /* Legacy NTLM auth with NTLMv2 hash */
  85         RawNTLMSSP,             /* NTLMSSP without SPNEGO, NTLMv2 hash */
  86 /*      NTLMSSP, */ /* can use rawNTLMSSP instead of NTLMSSP via SPNEGO */
  87         Kerberos,               /* Kerberos via SPNEGO */
  88         MSKerberos,             /* MS Kerberos via SPNEGO */
  89 };
  90
  91 enum protocolEnum {
  92         TCP = 0,
  93         SCTP
  94         /* Netbios frames protocol not supported at this time */
  95 };
  96
  97 struct mac_key {
  98         unsigned int len;
  99         union {
 100                 char ntlm[CIFS_SESS_KEY_SIZE + 16];
 101                 char krb5[CIFS_SESS_KEY_SIZE + 16]; /* BB: length correct? */
 102                 struct {
 103                         char key[16];
 104                         struct ntlmv2_resp resp;
 105                 } ntlmv2;
 106         } data;
 107 };
 108
 109 struct cifs_cred {
 110         int uid;
 111         int gid;
 112         int mode;
 113         int cecount;
 114         struct cifs_sid osid;
 115         struct cifs_sid gsid;
 116         struct cifs_ntace *ntaces;
 117         struct cifs_ace *aces;
 118 };
 119
 120 /*
 121  *****************************************************************
 122  * Except the CIFS PDUs themselves all the
 123  * globally interesting structs should go here
 124  *****************************************************************
 125  */
 126
 127 struct TCP_Server_Info {
 128         struct list_head tcp_ses_list;
 129         struct list_head smb_ses_list;
 130         int srv_count; /* reference counter */
 131         /* 15 character server name + 0x20 16th byte indicating type = srv */
 132         char server_RFC1001_name[RFC1001_NAME_LEN_WITH_NULL];
 133         char *hostname; /* hostname portion of UNC string */
 134         struct socket *ssocket;
 135         union {
 136                 struct sockaddr_in sockAddr;
 137                 struct sockaddr_in6 sockAddr6;
 138         } addr;
 139         wait_queue_head_t response_q;
 140         wait_queue_head_t request_q; /* if more than maxmpx to srvr must block*/
 141         struct list_head pending_mid_q;
 142         void *Server_NlsInfo;   /* BB - placeholder for future NLS info  */
 143         unsigned short server_codepage; /* codepage for the server    */
 144         unsigned long ip_address;       /* IP addr for the server if known */
 145         enum protocolEnum protocolType;
 146         char versionMajor;
 147         char versionMinor;
 148         bool svlocal:1;                 /* local server or remote */
 149         bool noblocksnd;                /* use blocking sendmsg */
 150         bool noautotune;                /* do not autotune send buf sizes */
 151         atomic_t inFlight;  /* number of requests on the wire to server */
 152 #ifdef CONFIG_CIFS_STATS2
 153         atomic_t inSend; /* requests trying to send */
 154         atomic_t num_waiters;   /* blocked waiting to get in sendrecv */
 155 #endif
 156         enum statusEnum tcpStatus; /* what we think the status is */
 157         struct mutex srv_mutex;
 158         struct task_struct *tsk;
 159         char server_GUID[16];
 160         char secMode;
 161         enum securityEnum secType;
 162         unsigned int maxReq;    /* Clients should submit no more */
 163         /* than maxReq distinct unanswered SMBs to the server when using  */
 164         /* multiplexed reads or writes */
 165         unsigned int maxBuf;    /* maxBuf specifies the maximum */
 166         /* message size the server can send or receive for non-raw SMBs */
 167         unsigned int max_rw;    /* maxRw specifies the maximum */
 168         /* message size the server can send or receive for */
 169         /* SMB_COM_WRITE_RAW or SMB_COM_READ_RAW. */
 170         unsigned int max_vcs;   /* maximum number of smb sessions, at least
 171                                    those that can be specified uniquely with
 172                                    vcnumbers */
 173         char sessid[4];         /* unique token id for this session */
 174         /* (returned on Negotiate */
 175         int capabilities; /* allow selective disabling of caps by smb sess */
 176         int timeAdj;  /* Adjust for difference in server time zone in sec */
 177         __u16 CurrentMid;         /* multiplex id - rotating counter */
 178         char cryptKey[CIFS_CRYPTO_KEY_SIZE];
 179         /* 16th byte of RFC1001 workstation name is always null */
 180         char workstation_RFC1001_name[RFC1001_NAME_LEN_WITH_NULL];
 181         __u32 sequence_number; /* needed for CIFS PDU signature */
 182         struct mac_key mac_signing_key;
 183         char ntlmv2_hash[16];
 184         unsigned long lstrp; /* when we got last response from this server */
 185 };
 186
 187 /*
 188  * The following is our shortcut to user information.  We surface the uid,
 189  * and name. We always get the password on the fly in case it
 190  * has changed. We also hang a list of sessions owned by this user off here.
 191  */
 192 struct cifsUidInfo {
 193         struct list_head userList;
 194         struct list_head sessionList; /* SMB sessions for this user */
 195         uid_t linux_uid;
 196         char user[MAX_USERNAME_SIZE + 1];       /* ascii name of user */
 197         /* BB may need ptr or callback for PAM or WinBind info */
 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 semaphore sesSem;
 207 #if 0
 208         struct cifsUidInfo *uidInfo;    /* pointer to user info */
 209 #endif
 210         struct TCP_Server_Info *server; /* pointer to server info */
 211         int ses_count;          /* reference counter */
 212         enum statusEnum status;
 213         unsigned overrideSecFlg;  /* if non-zero override global sec flags */
 214         __u16 ipc_tid;          /* special tid for connection to IPC share */
 215         __u16 flags;
 216         __u16 vcnum;
 217         char *serverOS;         /* name of operating system underlying server */
 218         char *serverNOS;        /* name of network operating system of server */
 219         char *serverDomain;     /* security realm of server */
 220         int Suid;               /* remote smb uid  */
 221         uid_t linux_uid;        /* local Linux uid */
 222         int capabilities;
 223         char serverName[SERVER_NAME_LEN_WITH_NULL * 2]; /* BB make bigger for
 224                                 TCP names - will ipv6 and sctp addresses fit? */
 225         char userName[MAX_USERNAME_SIZE + 1];
 226         char *domainName;
 227         char *password;
 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         /* 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 mutex lock_mutex;
 350         struct list_head llist; /* list of byte range locks we have. */
 351         bool closePend:1;       /* file is marked to close */
 352         bool invalidHandle:1;   /* file closed via session abend */
 353         bool messageMode:1;     /* for pipes: message vs byte mode */
 354         atomic_t wrtPending;   /* handle in use - defer close */
 355         struct mutex fh_mutex; /* prevents reopen race after dead ses*/
 356         struct cifs_search_info srch_inf;
 357 };
 358
 359 /*
 360  * One of these for each file inode
 361  */
 362
 363 struct cifsInodeInfo {
 364         struct list_head lockList;
 365         /* BB add in lists for dirty pages i.e. write caching info for oplock */
 366         struct list_head openFileList;
 367         int write_behind_rc;
 368         __u32 cifsAttrs; /* e.g. DOS archive bit, sparse, compressed, system */
 369         unsigned long time;     /* jiffies of last update/check of inode */
 370         bool clientCanCacheRead:1;      /* read oplock */
 371         bool clientCanCacheAll:1;       /* read and writebehind oplock */
 372         bool oplockPending:1;
 373         bool delete_pending:1;          /* DELETE_ON_CLOSE is set */
 374         u64  server_eof;                /* current file size on server */
 375         u64  uniqueid;                  /* server inode number */
 376         struct inode vfs_inode;
 377 };
 378
 379 static inline struct cifsInodeInfo *
 380 CIFS_I(struct inode *inode)
 381 {
 382         return container_of(inode, struct cifsInodeInfo, vfs_inode);
 383 }
 384
 385 static inline struct cifs_sb_info *
 386 CIFS_SB(struct super_block *sb)
 387 {
 388         return sb->s_fs_info;
 389 }
 390
 391 static inline char CIFS_DIR_SEP(const struct cifs_sb_info *cifs_sb)
 392 {
 393         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_POSIX_PATHS)
 394                 return '/';
 395         else
 396                 return '\\';
 397 }
 398
 399 #ifdef CONFIG_CIFS_STATS
 400 #define cifs_stats_inc atomic_inc
 401
 402 static inline void cifs_stats_bytes_written(struct cifsTconInfo *tcon,
 403                                             unsigned int bytes)
 404 {
 405         if (bytes) {
 406                 spin_lock(&tcon->stat_lock);
 407                 tcon->bytes_written += bytes;
 408                 spin_unlock(&tcon->stat_lock);
 409         }
 410 }
 411
 412 static inline void cifs_stats_bytes_read(struct cifsTconInfo *tcon,
 413                                          unsigned int bytes)
 414 {
 415         spin_lock(&tcon->stat_lock);
 416         tcon->bytes_read += bytes;
 417         spin_unlock(&tcon->stat_lock);
 418 }
 419 #else
 420
 421 #define  cifs_stats_inc(field) do {} while (0)
 422 #define  cifs_stats_bytes_written(tcon, bytes) do {} while (0)
 423 #define  cifs_stats_bytes_read(tcon, bytes) do {} while (0)
 424
 425 #endif
 426
 427 /* one of these for every pending CIFS request to the server */
 428 struct mid_q_entry {
 429         struct list_head qhead; /* mids waiting on reply from this server */
 430         __u16 mid;              /* multiplex id */
 431         __u16 pid;              /* process id */
 432         __u32 sequence_number;  /* for CIFS signing */
 433         unsigned long when_alloc;  /* when mid was created */
 434 #ifdef CONFIG_CIFS_STATS2
 435         unsigned long when_sent; /* time when smb send finished */
 436         unsigned long when_received; /* when demux complete (taken off wire) */
 437 #endif
 438         struct task_struct *tsk;        /* task waiting for response */
 439         struct smb_hdr *resp_buf;       /* response buffer */
 440         int midState;   /* wish this were enum but can not pass to wait_event */
 441         __u8 command;   /* smb command code */
 442         bool largeBuf:1;        /* if valid response, is pointer to large buf */
 443         bool multiRsp:1;        /* multiple trans2 responses for one request  */
 444         bool multiEnd:1;        /* both received */
 445 };
 446
 447 struct oplock_q_entry {
 448         struct list_head qhead;
 449         struct inode *pinode;
 450         struct cifsTconInfo *tcon;
 451         __u16 netfid;
 452 };
 453
 454 /* for pending dnotify requests */
 455 struct dir_notify_req {
 456        struct list_head lhead;
 457        __le16 Pid;
 458        __le16 PidHigh;
 459        __u16 Mid;
 460        __u16 Tid;
 461        __u16 Uid;
 462        __u16 netfid;
 463        __u32 filter; /* CompletionFilter (for multishot) */
 464        int multishot;
 465        struct file *pfile;
 466 };
 467
 468 struct dfs_info3_param {
 469         int flags; /* DFSREF_REFERRAL_SERVER, DFSREF_STORAGE_SERVER*/
 470         int path_consumed;
 471         int server_type;
 472         int ref_flag;
 473         char *path_name;
 474         char *node_name;
 475 };
 476
 477 /*
 478  * common struct for holding inode info when searching for or updating an
 479  * inode with new info
 480  */
 481
 482 #define CIFS_FATTR_DFS_REFERRAL         0x1
 483 #define CIFS_FATTR_DELETE_PENDING       0x2
 484 #define CIFS_FATTR_NEED_REVAL           0x4
 485
 486 struct cifs_fattr {
 487         u32             cf_flags;
 488         u32             cf_cifsattrs;
 489         u64             cf_uniqueid;
 490         u64             cf_eof;
 491         u64             cf_bytes;
 492         uid_t           cf_uid;
 493         gid_t           cf_gid;
 494         umode_t         cf_mode;
 495         dev_t           cf_rdev;
 496         unsigned int    cf_nlink;
 497         unsigned int    cf_dtype;
 498         struct timespec cf_atime;
 499         struct timespec cf_mtime;
 500         struct timespec cf_ctime;
 501 };
 502
 503 static inline void free_dfs_info_param(struct dfs_info3_param *param)
 504 {
 505         if (param) {
 506                 kfree(param->path_name);
 507                 kfree(param->node_name);
 508                 kfree(param);
 509         }
 510 }
 511
 512 static inline void free_dfs_info_array(struct dfs_info3_param *param,
 513                                        int number_of_items)
 514 {
 515         int i;
 516         if ((number_of_items == 0) || (param == NULL))
 517                 return;
 518         for (i = 0; i < number_of_items; i++) {
 519                 kfree(param[i].path_name);
 520                 kfree(param[i].node_name);
 521         }
 522         kfree(param);
 523 }
 524
 525 #define   MID_FREE 0
 526 #define   MID_REQUEST_ALLOCATED 1
 527 #define   MID_REQUEST_SUBMITTED 2
 528 #define   MID_RESPONSE_RECEIVED 4
 529 #define   MID_RETRY_NEEDED      8 /* session closed while this request out */
 530 #define   MID_NO_RESP_NEEDED 0x10
 531
 532 /* Types of response buffer returned from SendReceive2 */
 533 #define   CIFS_NO_BUFFER        0    /* Response buffer not returned */
 534 #define   CIFS_SMALL_BUFFER     1
 535 #define   CIFS_LARGE_BUFFER     2
 536 #define   CIFS_IOVEC            4    /* array of response buffers */
 537
 538 /* Type of Request to SendReceive2 */
 539 #define   CIFS_STD_OP           0    /* normal request timeout */
 540 #define   CIFS_LONG_OP          1    /* long op (up to 45 sec, oplock time) */
 541 #define   CIFS_VLONG_OP         2    /* sloow op - can take up to 180 seconds */
 542 #define   CIFS_BLOCKING_OP      4    /* operation can block */
 543 #define   CIFS_ASYNC_OP         8    /* do not wait for response */
 544 #define   CIFS_TIMEOUT_MASK 0x00F    /* only one of 5 above set in req */
 545 #define   CIFS_LOG_ERROR    0x010    /* log NT STATUS if non-zero */
 546 #define   CIFS_LARGE_BUF_OP 0x020    /* large request buffer */
 547 #define   CIFS_NO_RESP      0x040    /* no response buffer required */
 548
 549 /* Security Flags: indicate type of session setup needed */
 550 #define   CIFSSEC_MAY_SIGN      0x00001
 551 #define   CIFSSEC_MAY_NTLM      0x00002
 552 #define   CIFSSEC_MAY_NTLMV2    0x00004
 553 #define   CIFSSEC_MAY_KRB5      0x00008
 554 #ifdef CONFIG_CIFS_WEAK_PW_HASH
 555 #define   CIFSSEC_MAY_LANMAN    0x00010
 556 #define   CIFSSEC_MAY_PLNTXT    0x00020
 557 #else
 558 #define   CIFSSEC_MAY_LANMAN    0
 559 #define   CIFSSEC_MAY_PLNTXT    0
 560 #endif /* weak passwords */
 561 #define   CIFSSEC_MAY_SEAL      0x00040 /* not supported yet */
 562 #define   CIFSSEC_MAY_NTLMSSP   0x00080 /* raw ntlmssp with ntlmv2 */
 563
 564 #define   CIFSSEC_MUST_SIGN     0x01001
 565 /* note that only one of the following can be set so the
 566 result of setting MUST flags more than once will be to
 567 require use of the stronger protocol */
 568 #define   CIFSSEC_MUST_NTLM     0x02002
 569 #define   CIFSSEC_MUST_NTLMV2   0x04004
 570 #define   CIFSSEC_MUST_KRB5     0x08008
 571 #ifdef CONFIG_CIFS_WEAK_PW_HASH
 572 #define   CIFSSEC_MUST_LANMAN   0x10010
 573 #define   CIFSSEC_MUST_PLNTXT   0x20020
 574 #ifdef CONFIG_CIFS_UPCALL
 575 #define   CIFSSEC_MASK          0xBF0BF /* allows weak security but also krb5 */
 576 #else
 577 #define   CIFSSEC_MASK          0xB70B7 /* current flags supported if weak */
 578 #endif /* UPCALL */
 579 #else /* do not allow weak pw hash */
 580 #ifdef CONFIG_CIFS_UPCALL
 581 #define   CIFSSEC_MASK          0x8F08F /* flags supported if no weak allowed */
 582 #else
 583 #define   CIFSSEC_MASK          0x87087 /* flags supported if no weak allowed */
 584 #endif /* UPCALL */
 585 #endif /* WEAK_PW_HASH */
 586 #define   CIFSSEC_MUST_SEAL     0x40040 /* not supported yet */
 587 #define   CIFSSEC_MUST_NTLMSSP  0x80080 /* raw ntlmssp with ntlmv2 */
 588
 589 #define   CIFSSEC_DEF (CIFSSEC_MAY_SIGN | CIFSSEC_MAY_NTLM | CIFSSEC_MAY_NTLMV2)
 590 #define   CIFSSEC_MAX (CIFSSEC_MUST_SIGN | CIFSSEC_MUST_NTLMV2)
 591 #define   CIFSSEC_AUTH_MASK (CIFSSEC_MAY_NTLM | CIFSSEC_MAY_NTLMV2 | CIFSSEC_MAY_LANMAN | CIFSSEC_MAY_PLNTXT | CIFSSEC_MAY_KRB5 | CIFSSEC_MAY_NTLMSSP)
 592 /*
 593  *****************************************************************
 594  * All constants go here
 595  *****************************************************************
 596  */
 597
 598 #define UID_HASH (16)
 599
 600 /*
 601  * Note that ONE module should define _DECLARE_GLOBALS_HERE to cause the
 602  * following to be declared.
 603  */
 604
 605 /****************************************************************************
 606  *  Locking notes.  All updates to global variables and lists should be
 607  *                  protected by spinlocks or semaphores.
 608  *
 609  *  Spinlocks
 610  *  ---------
 611  *  GlobalMid_Lock protects:
 612  *      list operations on pending_mid_q and oplockQ
 613  *      updates to XID counters, multiplex id  and SMB sequence numbers
 614  *  GlobalSMBSesLock protects:
 615  *      list operations on tcp and SMB session lists and tCon lists
 616  *  f_owner.lock protects certain per file struct operations
 617  *  mapping->page_lock protects certain per page operations
 618  *
 619  *  Semaphores
 620  *  ----------
 621  *  sesSem     operations on smb session
 622  *  tconSem    operations on tree connection
 623  *  fh_sem      file handle reconnection operations
 624  *
 625  ****************************************************************************/
 626
 627 #ifdef DECLARE_GLOBALS_HERE
 628 #define GLOBAL_EXTERN
 629 #else
 630 #define GLOBAL_EXTERN extern
 631 #endif
 632
 633 /*
 634  * the list of TCP_Server_Info structures, ie each of the sockets
 635  * connecting our client to a distinct server (ip address), is
 636  * chained together by cifs_tcp_ses_list. The list of all our SMB
 637  * sessions (and from that the tree connections) can be found
 638  * by iterating over cifs_tcp_ses_list
 639  */
 640 GLOBAL_EXTERN struct list_head          cifs_tcp_ses_list;
 641
 642 /*
 643  * This lock protects the cifs_tcp_ses_list, the list of smb sessions per
 644  * tcp session, and the list of tcon's per smb session. It also protects
 645  * the reference counters for the server, smb session, and tcon. Finally,
 646  * changes to the tcon->tidStatus should be done while holding this lock.
 647  */
 648 GLOBAL_EXTERN rwlock_t          cifs_tcp_ses_lock;
 649
 650 /*
 651  * This lock protects the cifs_file->llist and cifs_file->flist
 652  * list operations, and updates to some flags (cifs_file->invalidHandle)
 653  * It will be moved to either use the tcon->stat_lock or equivalent later.
 654  * If cifs_tcp_ses_lock and the lock below are both needed to be held, then
 655  * the cifs_tcp_ses_lock must be grabbed first and released last.
 656  */
 657 GLOBAL_EXTERN rwlock_t GlobalSMBSeslock;
 658
 659 GLOBAL_EXTERN struct list_head GlobalOplock_Q;
 660
 661 /* Outstanding dir notify requests */
 662 GLOBAL_EXTERN struct list_head GlobalDnotifyReqList;
 663 /* DirNotify response queue */
 664 GLOBAL_EXTERN struct list_head GlobalDnotifyRsp_Q;
 665
 666 /*
 667  * Global transaction id (XID) information
 668  */
 669 GLOBAL_EXTERN unsigned int GlobalCurrentXid;    /* protected by GlobalMid_Sem */
 670 GLOBAL_EXTERN unsigned int GlobalTotalActiveXid; /* prot by GlobalMid_Sem */
 671 GLOBAL_EXTERN unsigned int GlobalMaxActiveXid;  /* prot by GlobalMid_Sem */
 672 GLOBAL_EXTERN spinlock_t GlobalMid_Lock;  /* protects above & list operations */
 673                                           /* on midQ entries */
 674 GLOBAL_EXTERN char Local_System_Name[15];
 675
 676 /*
 677  *  Global counters, updated atomically
 678  */
 679 GLOBAL_EXTERN atomic_t sesInfoAllocCount;
 680 GLOBAL_EXTERN atomic_t tconInfoAllocCount;
 681 GLOBAL_EXTERN atomic_t tcpSesAllocCount;
 682 GLOBAL_EXTERN atomic_t tcpSesReconnectCount;
 683 GLOBAL_EXTERN atomic_t tconInfoReconnectCount;
 684
 685 /* Various Debug counters */
 686 GLOBAL_EXTERN atomic_t bufAllocCount;    /* current number allocated  */
 687 #ifdef CONFIG_CIFS_STATS2
 688 GLOBAL_EXTERN atomic_t totBufAllocCount; /* total allocated over all time */
 689 GLOBAL_EXTERN atomic_t totSmBufAllocCount;
 690 #endif
 691 GLOBAL_EXTERN atomic_t smBufAllocCount;
 692 GLOBAL_EXTERN atomic_t midCount;
 693
 694 /* Misc globals */
 695 GLOBAL_EXTERN unsigned int multiuser_mount; /* if enabled allows new sessions
 696                                 to be established on existing mount if we
 697                                 have the uid/password or Kerberos credential
 698                                 or equivalent for current user */
 699 GLOBAL_EXTERN unsigned int oplockEnabled;
 700 GLOBAL_EXTERN unsigned int experimEnabled;
 701 GLOBAL_EXTERN unsigned int lookupCacheEnabled;
 702 GLOBAL_EXTERN unsigned int extended_security;   /* if on, session setup sent
 703                                 with more secure ntlmssp2 challenge/resp */
 704 GLOBAL_EXTERN unsigned int sign_CIFS_PDUs;  /* enable smb packet signing */
 705 GLOBAL_EXTERN unsigned int linuxExtEnabled;/*enable Linux/Unix CIFS extensions*/
 706 GLOBAL_EXTERN unsigned int CIFSMaxBufSize;  /* max size not including hdr */
 707 GLOBAL_EXTERN unsigned int cifs_min_rcv;    /* min size of big ntwrk buf pool */
 708 GLOBAL_EXTERN unsigned int cifs_min_small;  /* min size of small buf pool */
 709 GLOBAL_EXTERN unsigned int cifs_max_pending; /* MAX requests at once to server*/
 710