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,                /* NTLMSSP via SPNEGO, NTLMv2 hash */
  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_rmdirs;
 264         atomic_t num_renames;
 265         atomic_t num_t2renames;
 266         atomic_t num_ffirst;
 267         atomic_t num_fnext;
 268         atomic_t num_fclose;
 269         atomic_t num_hardlinks;
 270         atomic_t num_symlinks;
 271         atomic_t num_locks;
 272         atomic_t num_acl_get;
 273         atomic_t num_acl_set;
 274 #ifdef CONFIG_CIFS_STATS2
 275         unsigned long long time_writes;
 276         unsigned long long time_reads;
 277         unsigned long long time_opens;
 278         unsigned long long time_deletes;
 279         unsigned long long time_closes;
 280         unsigned long long time_mkdirs;
 281         unsigned long long time_rmdirs;
 282         unsigned long long time_renames;
 283         unsigned long long time_t2renames;
 284         unsigned long long time_ffirst;
 285         unsigned long long time_fnext;
 286         unsigned long long time_fclose;
 287 #endif /* CONFIG_CIFS_STATS2 */
 288         __u64    bytes_read;
 289         __u64    bytes_written;
 290         spinlock_t stat_lock;
 291 #endif /* CONFIG_CIFS_STATS */
 292         FILE_SYSTEM_DEVICE_INFO fsDevInfo;
 293         FILE_SYSTEM_ATTRIBUTE_INFO fsAttrInfo; /* ok if fs name truncated */
 294         FILE_SYSTEM_UNIX_INFO fsUnixInfo;
 295         bool ipc:1;             /* set if connection to IPC$ eg for RPC/PIPES */
 296         bool retry:1;
 297         bool nocase:1;
 298         bool seal:1;      /* transport encryption for this mounted share */
 299         bool unix_ext:1;  /* if false disable Linux extensions to CIFS protocol
 300                                 for this mount even if server would support */
 301         bool local_lease:1; /* check leases (only) on local system not remote */
 302         bool broken_posix_open; /* e.g. Samba server versions < 3.3.2, 3.2.9 */
 303         bool need_reconnect:1; /* connection reset, tid now invalid */
 304         /* BB add field for back pointer to sb struct(s)? */
 305 };
 306
 307 /*
 308  * This info hangs off the cifsFileInfo structure, pointed to by llist.
 309  * This is used to track byte stream locks on the file
 310  */
 311 struct cifsLockInfo {
 312         struct list_head llist; /* pointer to next cifsLockInfo */
 313         __u64 offset;
 314         __u64 length;
 315         __u8 type;
 316 };
 317
 318 /*
 319  * One of these for each open instance of a file
 320  */
 321 struct cifs_search_info {
 322         loff_t index_of_last_entry;
 323         __u16 entries_in_buffer;
 324         __u16 info_level;
 325         __u32 resume_key;
 326         char *ntwrk_buf_start;
 327         char *srch_entries_start;
 328         char *last_entry;
 329         char *presume_name;
 330         unsigned int resume_name_len;
 331         bool endOfSearch:1;
 332         bool emptyDir:1;
 333         bool unicode:1;
 334         bool smallBuf:1; /* so we know which buf_release function to call */
 335 };
 336
 337 struct cifsFileInfo {
 338         struct list_head tlist; /* pointer to next fid owned by tcon */
 339         struct list_head flist; /* next fid (file instance) for this inode */
 340         unsigned int uid;       /* allows finding which FileInfo structure */
 341         __u32 pid;              /* process id who opened file */
 342         __u16 netfid;           /* file id from remote */
 343         /* BB add lock scope info here if needed */ ;
 344         /* lock scope id (0 if none) */
 345         struct file *pfile; /* needed for writepage */
 346         struct inode *pInode; /* needed for oplock break */
 347         struct mutex lock_mutex;
 348         struct list_head llist; /* list of byte range locks we have. */
 349         bool closePend:1;       /* file is marked to close */
 350         bool invalidHandle:1;   /* file closed via session abend */
 351         bool messageMode:1;     /* for pipes: message vs byte mode */
 352         atomic_t wrtPending;   /* handle in use - defer close */
 353         struct mutex fh_mutex; /* prevents reopen race after dead ses*/
 354         struct cifs_search_info srch_inf;
 355 };
 356
 357 /*
 358  * One of these for each file inode
 359  */
 360
 361 struct cifsInodeInfo {
 362         struct list_head lockList;
 363         /* BB add in lists for dirty pages i.e. write caching info for oplock */
 364         struct list_head openFileList;
 365         int write_behind_rc;
 366         __u32 cifsAttrs; /* e.g. DOS archive bit, sparse, compressed, system */
 367         atomic_t inUse;  /* num concurrent users (local openers cifs) of file*/
 368         unsigned long time;     /* jiffies of last update/check of inode */
 369         bool clientCanCacheRead:1;      /* read oplock */
 370         bool clientCanCacheAll:1;       /* read and writebehind oplock */
 371         bool oplockPending:1;
 372         bool delete_pending:1;          /* DELETE_ON_CLOSE is set */
 373         u64  server_eof;                /* current file size on server */
 374         struct inode vfs_inode;
 375 };
 376
 377 static inline struct cifsInodeInfo *
 378 CIFS_I(struct inode *inode)
 379 {
 380         return container_of(inode, struct cifsInodeInfo, vfs_inode);
 381 }
 382
 383 static inline struct cifs_sb_info *
 384 CIFS_SB(struct super_block *sb)
 385 {
 386         return sb->s_fs_info;
 387 }
 388
 389 static inline char CIFS_DIR_SEP(const struct cifs_sb_info *cifs_sb)
 390 {
 391         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_POSIX_PATHS)
 392                 return '/';
 393         else
 394                 return '\\';
 395 }
 396
 397 #ifdef CONFIG_CIFS_STATS
 398 #define cifs_stats_inc atomic_inc
 399
 400 static inline void cifs_stats_bytes_written(struct cifsTconInfo *tcon,
 401                                             unsigned int bytes)
 402 {
 403         if (bytes) {
 404                 spin_lock(&tcon->stat_lock);
 405                 tcon->bytes_written += bytes;
 406                 spin_unlock(&tcon->stat_lock);
 407         }
 408 }
 409
 410 static inline void cifs_stats_bytes_read(struct cifsTconInfo *tcon,
 411                                          unsigned int bytes)
 412 {
 413         spin_lock(&tcon->stat_lock);
 414         tcon->bytes_read += bytes;
 415         spin_unlock(&tcon->stat_lock);
 416 }
 417 #else
 418
 419 #define  cifs_stats_inc(field) do {} while (0)
 420 #define  cifs_stats_bytes_written(tcon, bytes) do {} while (0)
 421 #define  cifs_stats_bytes_read(tcon, bytes) do {} while (0)
 422
 423 #endif
 424
 425 /* one of these for every pending CIFS request to the server */
 426 struct mid_q_entry {
 427         struct list_head qhead; /* mids waiting on reply from this server */
 428         __u16 mid;              /* multiplex id */
 429         __u16 pid;              /* process id */
 430         __u32 sequence_number;  /* for CIFS signing */
 431         unsigned long when_alloc;  /* when mid was created */
 432 #ifdef CONFIG_CIFS_STATS2
 433         unsigned long when_sent; /* time when smb send finished */
 434         unsigned long when_received; /* when demux complete (taken off wire) */
 435 #endif
 436         struct task_struct *tsk;        /* task waiting for response */
 437         struct smb_hdr *resp_buf;       /* response buffer */
 438         int midState;   /* wish this were enum but can not pass to wait_event */
 439         __u8 command;   /* smb command code */
 440         bool largeBuf:1;        /* if valid response, is pointer to large buf */
 441         bool multiRsp:1;        /* multiple trans2 responses for one request  */
 442         bool multiEnd:1;        /* both received */
 443 };
 444
 445 struct oplock_q_entry {
 446         struct list_head qhead;
 447         struct inode *pinode;
 448         struct cifsTconInfo *tcon;
 449         __u16 netfid;
 450 };
 451
 452 /* for pending dnotify requests */
 453 struct dir_notify_req {
 454        struct list_head lhead;
 455        __le16 Pid;
 456        __le16 PidHigh;
 457        __u16 Mid;
 458        __u16 Tid;
 459        __u16 Uid;
 460        __u16 netfid;
 461        __u32 filter; /* CompletionFilter (for multishot) */
 462        int multishot;
 463        struct file *pfile;
 464 };
 465
 466 struct dfs_info3_param {
 467         int flags; /* DFSREF_REFERRAL_SERVER, DFSREF_STORAGE_SERVER*/
 468         int path_consumed;
 469         int server_type;
 470         int ref_flag;
 471         char *path_name;
 472         char *node_name;
 473 };
 474
 475 static inline void free_dfs_info_param(struct dfs_info3_param *param)
 476 {
 477         if (param) {
 478                 kfree(param->path_name);
 479                 kfree(param->node_name);
 480                 kfree(param);
 481         }
 482 }
 483
 484 static inline void free_dfs_info_array(struct dfs_info3_param *param,
 485                                        int number_of_items)
 486 {
 487         int i;
 488         if ((number_of_items == 0) || (param == NULL))
 489                 return;
 490         for (i = 0; i < number_of_items; i++) {
 491                 kfree(param[i].path_name);
 492                 kfree(param[i].node_name);
 493         }
 494         kfree(param);
 495 }
 496
 497 #define   MID_FREE 0
 498 #define   MID_REQUEST_ALLOCATED 1
 499 #define   MID_REQUEST_SUBMITTED 2
 500 #define   MID_RESPONSE_RECEIVED 4
 501 #define   MID_RETRY_NEEDED      8 /* session closed while this request out */
 502 #define   MID_NO_RESP_NEEDED 0x10
 503
 504 /* Types of response buffer returned from SendReceive2 */
 505 #define   CIFS_NO_BUFFER        0    /* Response buffer not returned */
 506 #define   CIFS_SMALL_BUFFER     1
 507 #define   CIFS_LARGE_BUFFER     2
 508 #define   CIFS_IOVEC            4    /* array of response buffers */
 509
 510 /* Type of Request to SendReceive2 */
 511 #define   CIFS_STD_OP           0    /* normal request timeout */
 512 #define   CIFS_LONG_OP          1    /* long op (up to 45 sec, oplock time) */
 513 #define   CIFS_VLONG_OP         2    /* sloow op - can take up to 180 seconds */
 514 #define   CIFS_BLOCKING_OP      4    /* operation can block */
 515 #define   CIFS_ASYNC_OP         8    /* do not wait for response */
 516 #define   CIFS_TIMEOUT_MASK 0x00F    /* only one of 5 above set in req */
 517 #define   CIFS_LOG_ERROR    0x010    /* log NT STATUS if non-zero */
 518 #define   CIFS_LARGE_BUF_OP 0x020    /* large request buffer */
 519 #define   CIFS_NO_RESP      0x040    /* no response buffer required */
 520
 521 /* Security Flags: indicate type of session setup needed */
 522 #define   CIFSSEC_MAY_SIGN      0x00001
 523 #define   CIFSSEC_MAY_NTLM      0x00002
 524 #define   CIFSSEC_MAY_NTLMV2    0x00004
 525 #define   CIFSSEC_MAY_KRB5      0x00008
 526 #ifdef CONFIG_CIFS_WEAK_PW_HASH
 527 #define   CIFSSEC_MAY_LANMAN    0x00010
 528 #define   CIFSSEC_MAY_PLNTXT    0x00020
 529 #else
 530 #define   CIFSSEC_MAY_LANMAN    0
 531 #define   CIFSSEC_MAY_PLNTXT    0
 532 #endif /* weak passwords */
 533 #define   CIFSSEC_MAY_SEAL      0x00040 /* not supported yet */
 534 #define   CIFSSEC_MAY_NTLMSSP   0x00080 /* raw ntlmssp with ntlmv2 */
 535
 536 #define   CIFSSEC_MUST_SIGN     0x01001
 537 /* note that only one of the following can be set so the
 538 result of setting MUST flags more than once will be to
 539 require use of the stronger protocol */
 540 #define   CIFSSEC_MUST_NTLM     0x02002
 541 #define   CIFSSEC_MUST_NTLMV2   0x04004
 542 #define   CIFSSEC_MUST_KRB5     0x08008
 543 #ifdef CONFIG_CIFS_WEAK_PW_HASH
 544 #define   CIFSSEC_MUST_LANMAN   0x10010
 545 #define   CIFSSEC_MUST_PLNTXT   0x20020
 546 #ifdef CONFIG_CIFS_UPCALL
 547 #define   CIFSSEC_MASK          0xAF0AF /* allows weak security but also krb5 */
 548 #else
 549 #define   CIFSSEC_MASK          0xA70A7 /* current flags supported if weak */
 550 #endif /* UPCALL */
 551 #else /* do not allow weak pw hash */
 552 #ifdef CONFIG_CIFS_UPCALL
 553 #define   CIFSSEC_MASK          0x8F08F /* flags supported if no weak allowed */
 554 #else
 555 #define   CIFSSEC_MASK          0x87087 /* flags supported if no weak allowed */
 556 #endif /* UPCALL */
 557 #endif /* WEAK_PW_HASH */
 558 #define   CIFSSEC_MUST_SEAL     0x40040 /* not supported yet */
 559 #define   CIFSSEC_MUST_NTLMSSP  0x80080 /* raw ntlmssp with ntlmv2 */
 560
 561 #define   CIFSSEC_DEF (CIFSSEC_MAY_SIGN | CIFSSEC_MAY_NTLM | CIFSSEC_MAY_NTLMV2)
 562 #define   CIFSSEC_MAX (CIFSSEC_MUST_SIGN | CIFSSEC_MUST_NTLMV2)
 563 #define   CIFSSEC_AUTH_MASK (CIFSSEC_MAY_NTLM | CIFSSEC_MAY_NTLMV2 | CIFSSEC_MAY_LANMAN | CIFSSEC_MAY_PLNTXT | CIFSSEC_MAY_KRB5 | CIFSSEC_MAY_NTLMSSP)
 564 /*
 565  *****************************************************************
 566  * All constants go here
 567  *****************************************************************
 568  */
 569
 570 #define UID_HASH (16)
 571
 572 /*
 573  * Note that ONE module should define _DECLARE_GLOBALS_HERE to cause the
 574  * following to be declared.
 575  */
 576
 577 /****************************************************************************
 578  *  Locking notes.  All updates to global variables and lists should be
 579  *                  protected by spinlocks or semaphores.
 580  *
 581  *  Spinlocks
 582  *  ---------
 583  *  GlobalMid_Lock protects:
 584  *      list operations on pending_mid_q and oplockQ
 585  *      updates to XID counters, multiplex id  and SMB sequence numbers
 586  *  GlobalSMBSesLock protects:
 587  *      list operations on tcp and SMB session lists and tCon lists
 588  *  f_owner.lock protects certain per file struct operations
 589  *  mapping->page_lock protects certain per page operations
 590  *
 591  *  Semaphores
 592  *  ----------
 593  *  sesSem     operations on smb session
 594  *  tconSem    operations on tree connection
 595  *  fh_sem      file handle reconnection operations
 596  *
 597  ****************************************************************************/
 598
 599 #ifdef DECLARE_GLOBALS_HERE
 600 #define GLOBAL_EXTERN
 601 #else
 602 #define GLOBAL_EXTERN extern
 603 #endif
 604
 605 /*
 606  * the list of TCP_Server_Info structures, ie each of the sockets
 607  * connecting our client to a distinct server (ip address), is
 608  * chained together by cifs_tcp_ses_list. The list of all our SMB
 609  * sessions (and from that the tree connections) can be found
 610  * by iterating over cifs_tcp_ses_list
 611  */
 612 GLOBAL_EXTERN struct list_head          cifs_tcp_ses_list;
 613
 614 /*
 615  * This lock protects the cifs_tcp_ses_list, the list of smb sessions per
 616  * tcp session, and the list of tcon's per smb session. It also protects
 617  * the reference counters for the server, smb session, and tcon. Finally,
 618  * changes to the tcon->tidStatus should be done while holding this lock.
 619  */
 620 GLOBAL_EXTERN rwlock_t          cifs_tcp_ses_lock;
 621
 622 /*
 623  * This lock protects the cifs_file->llist and cifs_file->flist
 624  * list operations, and updates to some flags (cifs_file->invalidHandle)
 625  * It will be moved to either use the tcon->stat_lock or equivalent later.
 626  * If cifs_tcp_ses_lock and the lock below are both needed to be held, then
 627  * the cifs_tcp_ses_lock must be grabbed first and released last.
 628  */
 629 GLOBAL_EXTERN rwlock_t GlobalSMBSeslock;
 630
 631 GLOBAL_EXTERN struct list_head GlobalOplock_Q;
 632
 633 /* Outstanding dir notify requests */
 634 GLOBAL_EXTERN struct list_head GlobalDnotifyReqList;
 635 /* DirNotify response queue */
 636 GLOBAL_EXTERN struct list_head GlobalDnotifyRsp_Q;
 637
 638 /*
 639  * Global transaction id (XID) information
 640  */
 641 GLOBAL_EXTERN unsigned int GlobalCurrentXid;    /* protected by GlobalMid_Sem */
 642 GLOBAL_EXTERN unsigned int GlobalTotalActiveXid; /* prot by GlobalMid_Sem */
 643 GLOBAL_EXTERN unsigned int GlobalMaxActiveXid;  /* prot by GlobalMid_Sem */
 644 GLOBAL_EXTERN spinlock_t GlobalMid_Lock;  /* protects above & list operations */
 645                                           /* on midQ entries */
 646 GLOBAL_EXTERN char Local_System_Name[15];
 647
 648 /*
 649  *  Global counters, updated atomically
 650  */
 651 GLOBAL_EXTERN atomic_t sesInfoAllocCount;
 652 GLOBAL_EXTERN atomic_t tconInfoAllocCount;
 653 GLOBAL_EXTERN atomic_t tcpSesAllocCount;
 654 GLOBAL_EXTERN atomic_t tcpSesReconnectCount;
 655 GLOBAL_EXTERN atomic_t tconInfoReconnectCount;
 656
 657 /* Various Debug counters */
 658 GLOBAL_EXTERN atomic_t bufAllocCount;    /* current number allocated  */
 659 #ifdef CONFIG_CIFS_STATS2
 660 GLOBAL_EXTERN atomic_t totBufAllocCount; /* total allocated over all time */
 661 GLOBAL_EXTERN atomic_t totSmBufAllocCount;
 662 #endif
 663 GLOBAL_EXTERN atomic_t smBufAllocCount;
 664 GLOBAL_EXTERN atomic_t midCount;
 665
 666 /* Misc globals */
 667 GLOBAL_EXTERN unsigned int multiuser_mount; /* if enabled allows new sessions
 668                                 to be established on existing mount if we
 669                                 have the uid/password or Kerberos credential
 670                                 or equivalent for current user */
 671 GLOBAL_EXTERN unsigned int oplockEnabled;
 672 GLOBAL_EXTERN unsigned int experimEnabled;
 673 GLOBAL_EXTERN unsigned int lookupCacheEnabled;
 674 GLOBAL_EXTERN unsigned int extended_security;   /* if on, session setup sent
 675                                 with more secure ntlmssp2 challenge/resp */
 676 GLOBAL_EXTERN unsigned int sign_CIFS_PDUs;  /* enable smb packet signing */
 677 GLOBAL_EXTERN unsigned int linuxExtEnabled;/*enable Linux/Unix CIFS extensions*/
 678 GLOBAL_EXTERN unsigned int CIFSMaxBufSize;  /* max size not including hdr */
 679 GLOBAL_EXTERN unsigned int cifs_min_rcv;    /* min size of big ntwrk buf pool */
 680 GLOBAL_EXTERN unsigned int cifs_min_small;  /* min size of small buf pool */
 681 GLOBAL_EXTERN unsigned int cifs_max_pending; /* MAX requests at once to server*/
 682