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 <linux/slab.h>
  22 #include <linux/slow-work.h>
  23 #include "cifs_fs_sb.h"
  24 #include "cifsacl.h"
  25 /*
  26  * The sizes of various internal tables and strings
  27  */
  28 #define MAX_UID_INFO 16
  29 #define MAX_SES_INFO 2
  30 #define MAX_TCON_INFO 4
  31
  32 #define MAX_TREE_SIZE (2 + MAX_SERVER_SIZE + 1 + MAX_SHARE_SIZE + 1)
  33 #define MAX_SERVER_SIZE 15
  34 #define MAX_SHARE_SIZE  64      /* used to be 20, this should still be enough */
  35 #define MAX_USERNAME_SIZE 32    /* 32 is to allow for 15 char names + null
  36                                    termination then *2 for unicode versions */
  37 #define MAX_PASSWORD_SIZE 16
  38
  39 #define CIFS_MIN_RCV_POOL 4
  40
  41 /*
  42  * MAX_REQ is the maximum number of requests that WE will send
  43  * on one socket concurrently. It also matches the most common
  44  * value of max multiplex returned by servers.  We may
  45  * eventually want to use the negotiated value (in case
  46  * future servers can handle more) when we are more confident that
  47  * we will not have problems oveloading the socket with pending
  48  * write data.
  49  */
  50 #define CIFS_MAX_REQ 50
  51
  52 #define RFC1001_NAME_LEN 15
  53 #define RFC1001_NAME_LEN_WITH_NULL (RFC1001_NAME_LEN + 1)
  54
  55 /* currently length of NIP6_FMT */
  56 #define SERVER_NAME_LENGTH 40
  57 #define SERVER_NAME_LEN_WITH_NULL     (SERVER_NAME_LENGTH + 1)
  58
  59 /* used to define string lengths for reversing unicode strings */
  60 /*         (256+1)*2 = 514                                     */
  61 /*           (max path length + 1 for null) * 2 for unicode    */
  62 #define MAX_NAME 514
  63
  64 #include "cifspdu.h"
  65
  66 #ifndef XATTR_DOS_ATTRIB
  67 #define XATTR_DOS_ATTRIB "user.DOSATTRIB"
  68 #endif
  69
  70 /*
  71  * CIFS vfs client Status information (based on what we know.)
  72  */
  73
  74  /* associated with each tcp and smb session */
  75 enum statusEnum {
  76         CifsNew = 0,
  77         CifsGood,
  78         CifsExiting,
  79         CifsNeedReconnect
  80 };
  81
  82 enum securityEnum {
  83         PLAINTXT = 0,           /* Legacy with Plaintext passwords */
  84         LANMAN,                 /* Legacy LANMAN auth */
  85         NTLM,                   /* Legacy NTLM012 auth with NTLM hash */
  86         NTLMv2,                 /* Legacy NTLM auth with NTLMv2 hash */
  87         RawNTLMSSP,             /* NTLMSSP without SPNEGO, NTLMv2 hash */
  88 /*      NTLMSSP, */ /* can use rawNTLMSSP instead of NTLMSSP via SPNEGO */
  89         Kerberos,               /* Kerberos via SPNEGO */
  90 };
  91
  92 enum protocolEnum {
  93         TCP = 0,
  94         SCTP
  95         /* Netbios frames protocol not supported at this time */
  96 };
  97
  98 struct mac_key {
  99         unsigned int len;
 100         union {
 101                 char ntlm[CIFS_SESS_KEY_SIZE + 16];
 102                 char krb5[CIFS_SESS_KEY_SIZE + 16]; /* BB: length correct? */
 103                 struct {
 104                         char key[16];
 105                         struct ntlmv2_resp resp;
 106                 } ntlmv2;
 107         } data;
 108 };
 109
 110 struct cifs_cred {
 111         int uid;
 112         int gid;
 113         int mode;
 114         int cecount;
 115         struct cifs_sid osid;
 116         struct cifs_sid gsid;
 117         struct cifs_ntace *ntaces;
 118         struct cifs_ace *aces;
 119 };
 120
 121 /*
 122  *****************************************************************
 123  * Except the CIFS PDUs themselves all the
 124  * globally interesting structs should go here
 125  *****************************************************************
 126  */
 127
 128 struct TCP_Server_Info {
 129         struct list_head tcp_ses_list;
 130         struct list_head smb_ses_list;
 131         int srv_count; /* reference counter */
 132         /* 15 character server name + 0x20 16th byte indicating type = srv */
 133         char server_RFC1001_name[RFC1001_NAME_LEN_WITH_NULL];
 134         char *hostname; /* hostname portion of UNC string */
 135         struct socket *ssocket;
 136         union {
 137                 struct sockaddr_in sockAddr;
 138                 struct sockaddr_in6 sockAddr6;
 139         } addr;
 140         wait_queue_head_t response_q;
 141         wait_queue_head_t request_q; /* if more than maxmpx to srvr must block*/
 142         struct list_head pending_mid_q;
 143         void *Server_NlsInfo;   /* BB - placeholder for future NLS info  */
 144         unsigned short server_codepage; /* codepage for the server    */
 145         unsigned long ip_address;       /* IP addr for the server if known */
 146         enum protocolEnum protocolType;
 147         char versionMajor;
 148         char versionMinor;
 149         bool svlocal:1;                 /* local server or remote */
 150         bool noblocksnd;                /* use blocking sendmsg */
 151         bool noautotune;                /* do not autotune send buf sizes */
 152         bool tcp_nodelay;
 153         atomic_t inFlight;  /* number of requests on the wire to server */
 154 #ifdef CONFIG_CIFS_STATS2
 155         atomic_t inSend; /* requests trying to send */
 156         atomic_t num_waiters;   /* blocked waiting to get in sendrecv */
 157 #endif
 158         enum statusEnum tcpStatus; /* what we think the status is */
 159         struct mutex srv_mutex;
 160         struct task_struct *tsk;
 161         char server_GUID[16];
 162         char secMode;
 163         enum securityEnum secType;
 164         unsigned int maxReq;    /* Clients should submit no more */
 165         /* than maxReq distinct unanswered SMBs to the server when using  */
 166         /* multiplexed reads or writes */
 167         unsigned int maxBuf;    /* maxBuf specifies the maximum */
 168         /* message size the server can send or receive for non-raw SMBs */
 169         unsigned int max_rw;    /* maxRw specifies the maximum */
 170         /* message size the server can send or receive for */
 171         /* SMB_COM_WRITE_RAW or SMB_COM_READ_RAW. */
 172         unsigned int max_vcs;   /* maximum number of smb sessions, at least
 173                                    those that can be specified uniquely with
 174                                    vcnumbers */
 175         char sessid[4];         /* unique token id for this session */
 176         /* (returned on Negotiate */
 177         int capabilities; /* allow selective disabling of caps by smb sess */
 178         int timeAdj;  /* Adjust for difference in server time zone in sec */
 179         __u16 CurrentMid;         /* multiplex id - rotating counter */
 180         char cryptKey[CIFS_CRYPTO_KEY_SIZE];
 181         /* 16th byte of RFC1001 workstation name is always null */
 182         char workstation_RFC1001_name[RFC1001_NAME_LEN_WITH_NULL];
 183         __u32 sequence_number; /* needed for CIFS PDU signature */
 184         struct mac_key mac_signing_key;
 185         char ntlmv2_hash[16];
 186         unsigned long lstrp; /* when we got last response from this server */
 187         u16 dialect; /* dialect index that server chose */
 188         /* extended security flavors that server supports */
 189         bool    sec_kerberos;           /* supports plain Kerberos */
 190         bool    sec_mskerberos;         /* supports legacy MS Kerberos */
 191         bool    sec_kerberosu2u;        /* supports U2U Kerberos */
 192         bool    sec_ntlmssp;            /* supports NTLMSSP */
 193 };
 194
 195 /*
 196  * The following is our shortcut to user information.  We surface the uid,
 197  * and name. We always get the password on the fly in case it
 198  * has changed. We also hang a list of sessions owned by this user off here.
 199  */
 200 struct cifsUidInfo {
 201         struct list_head userList;
 202         struct list_head sessionList; /* SMB sessions for this user */
 203         uid_t linux_uid;
 204         char user[MAX_USERNAME_SIZE + 1];       /* ascii name of user */
 205         /* BB may need ptr or callback for PAM or WinBind info */
 206 };
 207
 208 /*
 209  * Session structure.  One of these for each uid session with a particular host
 210  */
 211 struct cifsSesInfo {
 212         struct list_head smb_ses_list;
 213         struct list_head tcon_list;
 214         struct mutex session_mutex;
 215 #if 0
 216         struct cifsUidInfo *uidInfo;    /* pointer to user info */
 217 #endif
 218         struct TCP_Server_Info *server; /* pointer to server info */
 219         int ses_count;          /* reference counter */
 220         enum statusEnum status;
 221         unsigned overrideSecFlg;  /* if non-zero override global sec flags */
 222         __u16 ipc_tid;          /* special tid for connection to IPC share */
 223         __u16 flags;
 224         __u16 vcnum;
 225         char *serverOS;         /* name of operating system underlying server */
 226         char *serverNOS;        /* name of network operating system of server */
 227         char *serverDomain;     /* security realm of server */
 228         int Suid;               /* remote smb uid  */
 229         uid_t linux_uid;        /* local Linux uid */
 230         int capabilities;
 231         char serverName[SERVER_NAME_LEN_WITH_NULL * 2]; /* BB make bigger for
 232                                 TCP names - will ipv6 and sctp addresses fit? */
 233         char userName[MAX_USERNAME_SIZE + 1];
 234         char *domainName;
 235         char *password;
 236         bool need_reconnect:1; /* connection reset, uid now invalid */
 237 };
 238 /* no more than one of the following three session flags may be set */
 239 #define CIFS_SES_NT4 1
 240 #define CIFS_SES_OS2 2
 241 #define CIFS_SES_W9X 4
 242 /* following flag is set for old servers such as OS2 (and Win95?)
 243    which do not negotiate NTLM or POSIX dialects, but instead
 244    negotiate one of the older LANMAN dialects */
 245 #define CIFS_SES_LANMAN 8
 246 /*
 247  * there is one of these for each connection to a resource on a particular
 248  * session
 249  */
 250 struct cifsTconInfo {
 251         struct list_head tcon_list;
 252         int tc_count;
 253         struct list_head openFileList;
 254         struct cifsSesInfo *ses;        /* pointer to session associated with */
 255         char treeName[MAX_TREE_SIZE + 1]; /* UNC name of resource in ASCII */
 256         char *nativeFileSystem;
 257         char *password;         /* for share-level security */
 258         __u16 tid;              /* The 2 byte tree id */
 259         __u16 Flags;            /* optional support bits */
 260         enum statusEnum tidStatus;
 261 #ifdef CONFIG_CIFS_STATS
 262         atomic_t num_smbs_sent;
 263         atomic_t num_writes;
 264         atomic_t num_reads;
 265         atomic_t num_flushes;
 266         atomic_t num_oplock_brks;
 267         atomic_t num_opens;
 268         atomic_t num_closes;
 269         atomic_t num_deletes;
 270         atomic_t num_mkdirs;
 271         atomic_t num_posixopens;
 272         atomic_t num_posixmkdirs;
 273         atomic_t num_rmdirs;
 274         atomic_t num_renames;
 275         atomic_t num_t2renames;
 276         atomic_t num_ffirst;
 277         atomic_t num_fnext;
 278         atomic_t num_fclose;
 279         atomic_t num_hardlinks;
 280         atomic_t num_symlinks;
 281         atomic_t num_locks;
 282         atomic_t num_acl_get;
 283         atomic_t num_acl_set;
 284 #ifdef CONFIG_CIFS_STATS2
 285         unsigned long long time_writes;
 286         unsigned long long time_reads;
 287         unsigned long long time_opens;
 288         unsigned long long time_deletes;
 289         unsigned long long time_closes;
 290         unsigned long long time_mkdirs;
 291         unsigned long long time_rmdirs;
 292         unsigned long long time_renames;
 293         unsigned long long time_t2renames;
 294         unsigned long long time_ffirst;
 295         unsigned long long time_fnext;
 296         unsigned long long time_fclose;
 297 #endif /* CONFIG_CIFS_STATS2 */
 298         __u64    bytes_read;
 299         __u64    bytes_written;
 300         spinlock_t stat_lock;
 301 #endif /* CONFIG_CIFS_STATS */
 302         FILE_SYSTEM_DEVICE_INFO fsDevInfo;
 303         FILE_SYSTEM_ATTRIBUTE_INFO fsAttrInfo; /* ok if fs name truncated */
 304         FILE_SYSTEM_UNIX_INFO fsUnixInfo;
 305         bool ipc:1;             /* set if connection to IPC$ eg for RPC/PIPES */
 306         bool retry:1;
 307         bool nocase:1;
 308         bool seal:1;      /* transport encryption for this mounted share */
 309         bool unix_ext:1;  /* if false disable Linux extensions to CIFS protocol
 310                                 for this mount even if server would support */
 311         bool local_lease:1; /* check leases (only) on local system not remote */
 312         bool broken_posix_open; /* e.g. Samba server versions < 3.3.2, 3.2.9 */
 313         bool need_reconnect:1; /* connection reset, tid now invalid */
 314         /* BB add field for back pointer to sb struct(s)? */
 315 };
 316
 317 /*
 318  * This info hangs off the cifsFileInfo structure, pointed to by llist.
 319  * This is used to track byte stream locks on the file
 320  */
 321 struct cifsLockInfo {
 322         struct list_head llist; /* pointer to next cifsLockInfo */
 323         __u64 offset;
 324         __u64 length;
 325         __u8 type;
 326 };
 327
 328 /*
 329  * One of these for each open instance of a file
 330  */
 331 struct cifs_search_info {
 332         loff_t index_of_last_entry;
 333         __u16 entries_in_buffer;
 334         __u16 info_level;
 335         __u32 resume_key;
 336         char *ntwrk_buf_start;
 337         char *srch_entries_start;
 338         char *last_entry;
 339         char *presume_name;
 340         unsigned int resume_name_len;
 341         bool endOfSearch:1;
 342         bool emptyDir:1;
 343         bool unicode:1;
 344         bool smallBuf:1; /* so we know which buf_release function to call */
 345 };
 346
 347 struct cifsFileInfo {
 348         struct list_head tlist; /* pointer to next fid owned by tcon */
 349         struct list_head flist; /* next fid (file instance) for this inode */
 350         unsigned int uid;       /* allows finding which FileInfo structure */
 351         __u32 pid;              /* process id who opened file */
 352         __u16 netfid;           /* file id from remote */
 353         /* BB add lock scope info here if needed */ ;
 354         /* lock scope id (0 if none) */
 355         struct file *pfile; /* needed for writepage */
 356         struct inode *pInode; /* needed for oplock break */
 357         struct vfsmount *mnt;
 358         struct mutex lock_mutex;
 359         struct list_head llist; /* list of byte range locks we have. */
 360         bool closePend:1;       /* file is marked to close */
 361         bool invalidHandle:1;   /* file closed via session abend */
 362         bool oplock_break_cancelled:1;
 363         atomic_t count;         /* reference count */
 364         struct mutex fh_mutex; /* prevents reopen race after dead ses*/
 365         struct cifs_search_info srch_inf;
 366         struct slow_work oplock_break; /* slow_work job for oplock breaks */
 367 };
 368
 369 /* Take a reference on the file private data */
 370 static inline void cifsFileInfo_get(struct cifsFileInfo *cifs_file)
 371 {
 372         atomic_inc(&cifs_file->count);
 373 }
 374
 375 /* Release a reference on the file private data */
 376 static inline void cifsFileInfo_put(struct cifsFileInfo *cifs_file)
 377 {
 378         if (atomic_dec_and_test(&cifs_file->count)) {
 379                 iput(cifs_file->pInode);
 380                 kfree(cifs_file);
 381         }
 382 }
 383
 384 /*
 385  * One of these for each file inode
 386  */
 387
 388 struct cifsInodeInfo {
 389         struct list_head lockList;
 390         /* BB add in lists for dirty pages i.e. write caching info for oplock */
 391         struct list_head openFileList;
 392         int write_behind_rc;
 393         __u32 cifsAttrs; /* e.g. DOS archive bit, sparse, compressed, system */
 394         unsigned long time;     /* jiffies of last update/check of inode */
 395         bool clientCanCacheRead:1;      /* read oplock */
 396         bool clientCanCacheAll:1;       /* read and writebehind oplock */
 397         bool delete_pending:1;          /* DELETE_ON_CLOSE is set */
 398         bool invalid_mapping:1;         /* pagecache is invalid */
 399         u64  server_eof;                /* current file size on server */
 400         u64  uniqueid;                  /* server inode number */
 401         struct inode vfs_inode;
 402 };
 403
 404 static inline struct cifsInodeInfo *
 405 CIFS_I(struct inode *inode)
 406 {
 407         return container_of(inode, struct cifsInodeInfo, vfs_inode);
 408 }
 409
 410 static inline struct cifs_sb_info *
 411 CIFS_SB(struct super_block *sb)
 412 {
 413         return sb->s_fs_info;
 414 }
 415
 416 static inline char CIFS_DIR_SEP(const struct cifs_sb_info *cifs_sb)
 417 {
 418         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_POSIX_PATHS)
 419                 return '/';
 420         else
 421                 return '\\';
 422 }
 423
 424 #ifdef CONFIG_CIFS_STATS
 425 #define cifs_stats_inc atomic_inc
 426
 427 static inline void cifs_stats_bytes_written(struct cifsTconInfo *tcon,
 428                                             unsigned int bytes)
 429 {
 430         if (bytes) {
 431                 spin_lock(&tcon->stat_lock);
 432                 tcon->bytes_written += bytes;
 433                 spin_unlock(&tcon->stat_lock);
 434         }
 435 }
 436
 437 static inline void cifs_stats_bytes_read(struct cifsTconInfo *tcon,
 438                                          unsigned int bytes)
 439 {
 440         spin_lock(&tcon->stat_lock);
 441         tcon->bytes_read += bytes;
 442         spin_unlock(&tcon->stat_lock);
 443 }
 444 #else
 445
 446 #define  cifs_stats_inc(field) do {} while (0)
 447 #define  cifs_stats_bytes_written(tcon, bytes) do {} while (0)
 448 #define  cifs_stats_bytes_read(tcon, bytes) do {} while (0)
 449
 450 #endif
 451
 452 /* one of these for every pending CIFS request to the server */
 453 struct mid_q_entry {
 454         struct list_head qhead; /* mids waiting on reply from this server */
 455         __u16 mid;              /* multiplex id */
 456         __u16 pid;              /* process id */
 457         __u32 sequence_number;  /* for CIFS signing */
 458         unsigned long when_alloc;  /* when mid was created */
 459 #ifdef CONFIG_CIFS_STATS2
 460         unsigned long when_sent; /* time when smb send finished */
 461         unsigned long when_received; /* when demux complete (taken off wire) */
 462 #endif
 463         struct task_struct *tsk;        /* task waiting for response */
 464         struct smb_hdr *resp_buf;       /* response buffer */
 465         int midState;   /* wish this were enum but can not pass to wait_event */
 466         __u8 command;   /* smb command code */
 467         bool largeBuf:1;        /* if valid response, is pointer to large buf */
 468         bool multiRsp:1;        /* multiple trans2 responses for one request  */
 469         bool multiEnd:1;        /* both received */
 470 };
 471
 472 struct oplock_q_entry {
 473         struct list_head qhead;
 474         struct inode *pinode;
 475         struct cifsTconInfo *tcon;
 476         __u16 netfid;
 477 };
 478
 479 /* for pending dnotify requests */
 480 struct dir_notify_req {
 481        struct list_head lhead;
 482        __le16 Pid;
 483        __le16 PidHigh;
 484        __u16 Mid;
 485        __u16 Tid;
 486        __u16 Uid;
 487        __u16 netfid;
 488        __u32 filter; /* CompletionFilter (for multishot) */
 489        int multishot;
 490        struct file *pfile;
 491 };
 492
 493 struct dfs_info3_param {
 494         int flags; /* DFSREF_REFERRAL_SERVER, DFSREF_STORAGE_SERVER*/
 495         int path_consumed;
 496         int server_type;
 497         int ref_flag;
 498         char *path_name;
 499         char *node_name;
 500 };
 501
 502 /*
 503  * common struct for holding inode info when searching for or updating an
 504  * inode with new info
 505  */
 506
 507 #define CIFS_FATTR_DFS_REFERRAL         0x1
 508 #define CIFS_FATTR_DELETE_PENDING       0x2
 509 #define CIFS_FATTR_NEED_REVAL           0x4
 510
 511 struct cifs_fattr {
 512         u32             cf_flags;
 513         u32             cf_cifsattrs;
 514         u64             cf_uniqueid;
 515         u64             cf_eof;
 516         u64             cf_bytes;
 517         uid_t           cf_uid;
 518         gid_t           cf_gid;
 519         umode_t         cf_mode;
 520         dev_t           cf_rdev;
 521         unsigned int    cf_nlink;
 522         unsigned int    cf_dtype;
 523         struct timespec cf_atime;
 524         struct timespec cf_mtime;
 525         struct timespec cf_ctime;
 526 };
 527
 528 static inline void free_dfs_info_param(struct dfs_info3_param *param)
 529 {
 530         if (param) {
 531                 kfree(param->path_name);
 532                 kfree(param->node_name);
 533                 kfree(param);
 534         }
 535 }
 536
 537 static inline void free_dfs_info_array(struct dfs_info3_param *param,
 538                                        int number_of_items)
 539 {
 540         int i;
 541         if ((number_of_items == 0) || (param == NULL))
 542                 return;
 543         for (i = 0; i < number_of_items; i++) {
 544                 kfree(param[i].path_name);
 545                 kfree(param[i].node_name);
 546         }
 547         kfree(param);
 548 }
 549
 550 #define   MID_FREE 0
 551 #define   MID_REQUEST_ALLOCATED 1
 552 #define   MID_REQUEST_SUBMITTED 2
 553 #define   MID_RESPONSE_RECEIVED 4
 554 #define   MID_RETRY_NEEDED      8 /* session closed while this request out */
 555 #define   MID_NO_RESP_NEEDED 0x10
 556
 557 /* Types of response buffer returned from SendReceive2 */
 558 #define   CIFS_NO_BUFFER        0    /* Response buffer not returned */
 559 #define   CIFS_SMALL_BUFFER     1
 560 #define   CIFS_LARGE_BUFFER     2
 561 #define   CIFS_IOVEC            4    /* array of response buffers */
 562
 563 /* Type of Request to SendReceive2 */
 564 #define   CIFS_STD_OP           0    /* normal request timeout */
 565 #define   CIFS_LONG_OP          1    /* long op (up to 45 sec, oplock time) */
 566 #define   CIFS_VLONG_OP         2    /* sloow op - can take up to 180 seconds */
 567 #define   CIFS_BLOCKING_OP      4    /* operation can block */
 568 #define   CIFS_ASYNC_OP         8    /* do not wait for response */
 569 #define   CIFS_TIMEOUT_MASK 0x00F    /* only one of 5 above set in req */
 570 #define   CIFS_LOG_ERROR    0x010    /* log NT STATUS if non-zero */
 571 #define   CIFS_LARGE_BUF_OP 0x020    /* large request buffer */
 572 #define   CIFS_NO_RESP      0x040    /* no response buffer required */
 573
 574 /* Security Flags: indicate type of session setup needed */
 575 #define   CIFSSEC_MAY_SIGN      0x00001
 576 #define   CIFSSEC_MAY_NTLM      0x00002
 577 #define   CIFSSEC_MAY_NTLMV2    0x00004
 578 #define   CIFSSEC_MAY_KRB5      0x00008
 579 #ifdef CONFIG_CIFS_WEAK_PW_HASH
 580 #define   CIFSSEC_MAY_LANMAN    0x00010
 581 #define   CIFSSEC_MAY_PLNTXT    0x00020
 582 #else
 583 #define   CIFSSEC_MAY_LANMAN    0
 584 #define   CIFSSEC_MAY_PLNTXT    0
 585 #endif /* weak passwords */
 586 #define   CIFSSEC_MAY_SEAL      0x00040 /* not supported yet */
 587 #define   CIFSSEC_MAY_NTLMSSP   0x00080 /* raw ntlmssp with ntlmv2 */
 588
 589 #define   CIFSSEC_MUST_SIGN     0x01001
 590 /* note that only one of the following can be set so the
 591 result of setting MUST flags more than once will be to
 592 require use of the stronger protocol */
 593 #define   CIFSSEC_MUST_NTLM     0x02002
 594 #define   CIFSSEC_MUST_NTLMV2   0x04004
 595 #define   CIFSSEC_MUST_KRB5     0x08008
 596 #ifdef CONFIG_CIFS_WEAK_PW_HASH
 597 #define   CIFSSEC_MUST_LANMAN   0x10010
 598 #define   CIFSSEC_MUST_PLNTXT   0x20020
 599 #ifdef CONFIG_CIFS_UPCALL
 600 #define   CIFSSEC_MASK          0xBF0BF /* allows weak security but also krb5 */
 601 #else
 602 #define   CIFSSEC_MASK          0xB70B7 /* current flags supported if weak */
 603 #endif /* UPCALL */
 604 #else /* do not allow weak pw hash */
 605 #ifdef CONFIG_CIFS_UPCALL
 606 #define   CIFSSEC_MASK          0x8F08F /* flags supported if no weak allowed */
 607 #else
 608 #define   CIFSSEC_MASK          0x87087 /* flags supported if no weak allowed */
 609 #endif /* UPCALL */
 610 #endif /* WEAK_PW_HASH */
 611 #define   CIFSSEC_MUST_SEAL     0x40040 /* not supported yet */
 612 #define   CIFSSEC_MUST_NTLMSSP  0x80080 /* raw ntlmssp with ntlmv2 */
 613
 614 #define   CIFSSEC_DEF (CIFSSEC_MAY_SIGN | CIFSSEC_MAY_NTLM | CIFSSEC_MAY_NTLMV2)
 615 #define   CIFSSEC_MAX (CIFSSEC_MUST_SIGN | CIFSSEC_MUST_NTLMV2)
 616 #define   CIFSSEC_AUTH_MASK (CIFSSEC_MAY_NTLM | CIFSSEC_MAY_NTLMV2 | CIFSSEC_MAY_LANMAN | CIFSSEC_MAY_PLNTXT | CIFSSEC_MAY_KRB5 | CIFSSEC_MAY_NTLMSSP)
 617 /*
 618  *****************************************************************
 619  * All constants go here
 620  *****************************************************************
 621  */
 622
 623 #define UID_HASH (16)
 624
 625 /*
 626  * Note that ONE module should define _DECLARE_GLOBALS_HERE to cause the
 627  * following to be declared.
 628  */
 629
 630 /****************************************************************************
 631  *  Locking notes.  All updates to global variables and lists should be
 632  *                  protected by spinlocks or semaphores.
 633  *
 634  *  Spinlocks
 635  *  ---------
 636  *  GlobalMid_Lock protects:
 637  *      list operations on pending_mid_q and oplockQ
 638  *      updates to XID counters, multiplex id  and SMB sequence numbers
 639  *  GlobalSMBSesLock protects:
 640  *      list operations on tcp and SMB session lists and tCon lists
 641  *  f_owner.lock protects certain per file struct operations
 642  *  mapping->page_lock protects certain per page operations
 643  *
 644  *  Semaphores
 645  *  ----------
 646  *  sesSem     operations on smb session
 647  *  tconSem    operations on tree connection
 648  *  fh_sem      file handle reconnection operations
 649  *
 650  ****************************************************************************/
 651
 652 #ifdef DECLARE_GLOBALS_HERE
 653 #define GLOBAL_EXTERN
 654 #else
 655 #define GLOBAL_EXTERN extern
 656 #endif
 657
 658 /*
 659  * the list of TCP_Server_Info structures, ie each of the sockets
 660  * connecting our client to a distinct server (ip address), is
 661  * chained together by cifs_tcp_ses_list. The list of all our SMB
 662  * sessions (and from that the tree connections) can be found
 663  * by iterating over cifs_tcp_ses_list
 664  */
 665 GLOBAL_EXTERN struct list_head          cifs_tcp_ses_list;
 666
 667 /*
 668  * This lock protects the cifs_tcp_ses_list, the list of smb sessions per
 669  * tcp session, and the list of tcon's per smb session. It also protects
 670  * the reference counters for the server, smb session, and tcon. Finally,
 671  * changes to the tcon->tidStatus should be done while holding this lock.
 672  */
 673 GLOBAL_EXTERN rwlock_t          cifs_tcp_ses_lock;
 674
 675 /*
 676  * This lock protects the cifs_file->llist and cifs_file->flist
 677  * list operations, and updates to some flags (cifs_file->invalidHandle)
 678  * It will be moved to either use the tcon->stat_lock or equivalent later.
 679  * If cifs_tcp_ses_lock and the lock below are both needed to be held, then
 680  * the cifs_tcp_ses_lock must be grabbed first and released last.
 681  */
 682 GLOBAL_EXTERN rwlock_t GlobalSMBSeslock;
 683
 684 /* Outstanding dir notify requests */
 685 GLOBAL_EXTERN struct list_head GlobalDnotifyReqList;
 686 /* DirNotify response queue */
 687 GLOBAL_EXTERN struct list_head GlobalDnotifyRsp_Q;
 688
 689 /*
 690  * Global transaction id (XID) information
 691  */
 692 GLOBAL_EXTERN unsigned int GlobalCurrentXid;    /* protected by GlobalMid_Sem */
 693 GLOBAL_EXTERN unsigned int GlobalTotalActiveXid; /* prot by GlobalMid_Sem */
 694 GLOBAL_EXTERN unsigned int GlobalMaxActiveXid;  /* prot by GlobalMid_Sem */
 695 GLOBAL_EXTERN spinlock_t GlobalMid_Lock;  /* protects above & list operations */
 696                                           /* on midQ entries */
 697 GLOBAL_EXTERN char Local_System_Name[15];
 698
 699 /*
 700  *  Global counters, updated atomically
 701  */
 702 GLOBAL_EXTERN atomic_t sesInfoAllocCount;
 703 GLOBAL_EXTERN atomic_t tconInfoAllocCount;
 704 GLOBAL_EXTERN atomic_t tcpSesAllocCount;
 705 GLOBAL_EXTERN atomic_t tcpSesReconnectCount;
 706 GLOBAL_EXTERN atomic_t tconInfoReconnectCount;
 707
 708 /* Various Debug counters */
 709 GLOBAL_EXTERN atomic_t bufAllocCount;    /* current number allocated  */
 710 #ifdef CONFIG_CIFS_STATS2
 711 GLOBAL_EXTERN atomic_t totBufAllocCount; /* total allocated over all time */
 712 GLOBAL_EXTERN atomic_t totSmBufAllocCount;
 713 #endif
 714 GLOBAL_EXTERN atomic_t smBufAllocCount;
 715 GLOBAL_EXTERN atomic_t midCount;
 716
 717 /* Misc globals */
 718 GLOBAL_EXTERN unsigned int multiuser_mount; /* if enabled allows new sessions
 719                                 to be established on existing mount if we
 720                                 have the uid/password or Kerberos credential
 721                                 or equivalent for current user */
 722 GLOBAL_EXTERN unsigned int oplockEnabled;
 723 GLOBAL_EXTERN unsigned int experimEnabled;
 724 GLOBAL_EXTERN unsigned int lookupCacheEnabled;
 725 GLOBAL_EXTERN unsigned int global_secflags;     /* if on, session setup sent
 726                                 with more secure ntlmssp2 challenge/resp */
 727 GLOBAL_EXTERN unsigned int sign_CIFS_PDUs;  /* enable smb packet signing */
 728 GLOBAL_EXTERN unsigned int linuxExtEnabled;/*enable Linux/Unix CIFS extensions*/
 729 GLOBAL_EXTERN unsigned int CIFSMaxBufSize;  /* max size not including hdr */
 730 GLOBAL_EXTERN unsigned int cifs_min_rcv;    /* min size of big ntwrk buf pool */
 731 GLOBAL_EXTERN unsigned int cifs_min_small;  /* min size of small buf pool */
 732 GLOBAL_EXTERN unsigned int cifs_max_pending; /* MAX requests at once to server*/
 733
 734 extern const struct slow_work_ops cifs_oplock_break_ops;