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