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