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