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 #ifndef _CIFS_GLOB_H
  20 #define _CIFS_GLOB_H
  21
  22 #include <linux/in.h>
  23 #include <linux/in6.h>
  24 #include <linux/slab.h>
  25 #include <linux/workqueue.h>
  26 #include "cifs_fs_sb.h"
  27 #include "cifsacl.h"
  28 /*
  29  * The sizes of various internal tables and strings
  30  */
  31 #define MAX_UID_INFO 16
  32 #define MAX_SES_INFO 2
  33 #define MAX_TCON_INFO 4
  34
  35 #define MAX_TREE_SIZE (2 + MAX_SERVER_SIZE + 1 + MAX_SHARE_SIZE + 1)
  36 #define MAX_SERVER_SIZE 15
  37 #define MAX_SHARE_SIZE  64      /* used to be 20, this should still be enough */
  38 #define MAX_USERNAME_SIZE 32    /* 32 is to allow for 15 char names + null
  39                                    termination then *2 for unicode versions */
  40 #define MAX_PASSWORD_SIZE 512  /* max for windows seems to be 256 wide chars */
  41
  42 #define CIFS_MIN_RCV_POOL 4
  43
  44 /*
  45  * MAX_REQ is the maximum number of requests that WE will send
  46  * on one socket concurrently. It also matches the most common
  47  * value of max multiplex returned by servers.  We may
  48  * eventually want to use the negotiated value (in case
  49  * future servers can handle more) when we are more confident that
  50  * we will not have problems oveloading the socket with pending
  51  * write data.
  52  */
  53 #define CIFS_MAX_REQ 50
  54
  55 #define RFC1001_NAME_LEN 15
  56 #define RFC1001_NAME_LEN_WITH_NULL (RFC1001_NAME_LEN + 1)
  57
  58 /* currently length of NIP6_FMT */
  59 #define SERVER_NAME_LENGTH 40
  60 #define SERVER_NAME_LEN_WITH_NULL     (SERVER_NAME_LENGTH + 1)
  61
  62 /* used to define string lengths for reversing unicode strings */
  63 /*         (256+1)*2 = 514                                     */
  64 /*           (max path length + 1 for null) * 2 for unicode    */
  65 #define MAX_NAME 514
  66
  67 #include "cifspdu.h"
  68
  69 #ifndef XATTR_DOS_ATTRIB
  70 #define XATTR_DOS_ATTRIB "user.DOSATTRIB"
  71 #endif
  72
  73 /*
  74  * CIFS vfs client Status information (based on what we know.)
  75  */
  76
  77  /* associated with each tcp and smb session */
  78 enum statusEnum {
  79         CifsNew = 0,
  80         CifsGood,
  81         CifsExiting,
  82         CifsNeedReconnect
  83 };
  84
  85 enum securityEnum {
  86         LANMAN = 0,                     /* Legacy LANMAN auth */
  87         NTLM,                   /* Legacy NTLM012 auth with NTLM hash */
  88         NTLMv2,                 /* Legacy NTLM auth with NTLMv2 hash */
  89         RawNTLMSSP,             /* NTLMSSP without SPNEGO, NTLMv2 hash */
  90 /*      NTLMSSP, */ /* can use rawNTLMSSP instead of NTLMSSP via SPNEGO */
  91         Kerberos,               /* Kerberos via SPNEGO */
  92 };
  93
  94 enum protocolEnum {
  95         TCP = 0,
  96         SCTP
  97         /* Netbios frames protocol not supported at this time */
  98 };
  99
 100 struct session_key {
 101         unsigned int len;
 102         union {
 103                 char ntlm[CIFS_SESS_KEY_SIZE + 16];
 104                 char krb5[CIFS_SESS_KEY_SIZE + 16]; /* BB: length correct? */
 105                 struct {
 106                         char key[16];
 107                         struct ntlmv2_resp resp;
 108                 } ntlmv2;
 109         } data;
 110 };
 111
 112 struct cifs_cred {
 113         int uid;
 114         int gid;
 115         int mode;
 116         int cecount;
 117         struct cifs_sid osid;
 118         struct cifs_sid gsid;
 119         struct cifs_ntace *ntaces;
 120         struct cifs_ace *aces;
 121 };
 122
 123 /*
 124  *****************************************************************
 125  * Except the CIFS PDUs themselves all the
 126  * globally interesting structs should go here
 127  *****************************************************************
 128  */
 129
 130 struct TCP_Server_Info {
 131         struct list_head tcp_ses_list;
 132         struct list_head smb_ses_list;
 133         int srv_count; /* reference counter */
 134         /* 15 character server name + 0x20 16th byte indicating type = srv */
 135         char server_RFC1001_name[RFC1001_NAME_LEN_WITH_NULL];
 136         char *hostname; /* hostname portion of UNC string */
 137         struct socket *ssocket;
 138         union {
 139                 struct sockaddr_in sockAddr;
 140                 struct sockaddr_in6 sockAddr6;
 141         } addr;
 142         struct sockaddr_storage srcaddr; /* locally bind to this IP */
 143         wait_queue_head_t response_q;
 144         wait_queue_head_t request_q; /* if more than maxmpx to srvr must block*/
 145         struct list_head pending_mid_q;
 146         void *Server_NlsInfo;   /* BB - placeholder for future NLS info  */
 147         unsigned short server_codepage; /* codepage for the server    */
 148         enum protocolEnum protocolType;
 149         char versionMajor;
 150         char versionMinor;
 151         bool svlocal:1;                 /* local server or remote */
 152         bool noblocksnd;                /* use blocking sendmsg */
 153         bool noautotune;                /* do not autotune send buf sizes */
 154         bool tcp_nodelay;
 155         atomic_t inFlight;  /* number of requests on the wire to server */
 156 #ifdef CONFIG_CIFS_STATS2
 157         atomic_t inSend; /* requests trying to send */
 158         atomic_t num_waiters;   /* blocked waiting to get in sendrecv */
 159 #endif
 160         enum statusEnum tcpStatus; /* what we think the status is */
 161         struct mutex srv_mutex;
 162         struct task_struct *tsk;
 163         char server_GUID[16];
 164         char secMode;
 165         enum securityEnum secType;
 166         unsigned int maxReq;    /* Clients should submit no more */
 167         /* than maxReq distinct unanswered SMBs to the server when using  */
 168         /* multiplexed reads or writes */
 169         unsigned int maxBuf;    /* maxBuf specifies the maximum */
 170         /* message size the server can send or receive for non-raw SMBs */
 171         unsigned int max_rw;    /* maxRw specifies the maximum */
 172         /* message size the server can send or receive for */
 173         /* SMB_COM_WRITE_RAW or SMB_COM_READ_RAW. */
 174         unsigned int max_vcs;   /* maximum number of smb sessions, at least
 175                                    those that can be specified uniquely with
 176                                    vcnumbers */
 177         char sessid[4];         /* unique token id for this session */
 178         /* (returned on Negotiate */
 179         int capabilities; /* allow selective disabling of caps by smb sess */
 180         int timeAdj;  /* Adjust for difference in server time zone in sec */
 181         __u16 CurrentMid;         /* multiplex id - rotating counter */
 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 session_key session_key;
 186         unsigned long lstrp; /* when we got last response from this server */
 187         u16 dialect; /* dialect index that server chose */
 188         /* extended security flavors that server supports */
 189         bool    sec_kerberos;           /* supports plain Kerberos */
 190         bool    sec_mskerberos;         /* supports legacy MS Kerberos */
 191         bool    sec_kerberosu2u;        /* supports U2U Kerberos */
 192         bool    sec_ntlmssp;            /* supports NTLMSSP */
 193         bool session_estab; /* mark when very first sess is established */
 194 #ifdef CONFIG_CIFS_FSCACHE
 195         struct fscache_cookie   *fscache; /* client index cache cookie */
 196 #endif
 197 };
 198
 199 /*
 200  * Session structure.  One of these for each uid session with a particular host
 201  */
 202 struct cifsSesInfo {
 203         struct list_head smb_ses_list;
 204         struct list_head tcon_list;
 205         struct mutex session_mutex;
 206         struct TCP_Server_Info *server; /* pointer to server info */
 207         int ses_count;          /* reference counter */
 208         enum statusEnum status;
 209         unsigned overrideSecFlg;  /* if non-zero override global sec flags */
 210         __u16 ipc_tid;          /* special tid for connection to IPC share */
 211         __u16 flags;
 212         __u16 vcnum;
 213         char *serverOS;         /* name of operating system underlying server */
 214         char *serverNOS;        /* name of network operating system of server */
 215         char *serverDomain;     /* security realm of server */
 216         int Suid;               /* remote smb uid  */
 217         uid_t linux_uid;        /* overriding owner of files on the mount */
 218         uid_t cred_uid;         /* owner of credentials */
 219         int capabilities;
 220         char serverName[SERVER_NAME_LEN_WITH_NULL * 2]; /* BB make bigger for
 221                                 TCP names - will ipv6 and sctp addresses fit? */
 222         char userName[MAX_USERNAME_SIZE + 1];
 223         char *domainName;
 224         char *password;
 225         char cryptKey[CIFS_CRYPTO_KEY_SIZE];
 226         struct session_key auth_key;
 227         char ntlmv2_hash[16];
 228         unsigned int tilen; /* length of the target info blob */
 229         unsigned char *tiblob; /* target info blob in challenge response */
 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 #ifdef CONFIG_CIFS_FSCACHE
 309         u64 resource_id;                /* server resource id */
 310         struct fscache_cookie *fscache; /* cookie for share */
 311 #endif
 312         /* BB add field for back pointer to sb struct(s)? */
 313 };
 314
 315 /*
 316  * This is a refcounted and timestamped container for a tcon pointer. The
 317  * container holds a tcon reference. It is considered safe to free one of
 318  * these when the tl_count goes to 0. The tl_time is the time of the last
 319  * "get" on the container.
 320  */
 321 struct tcon_link {
 322         unsigned long           tl_index;
 323         unsigned long           tl_flags;
 324 #define TCON_LINK_MASTER        0
 325 #define TCON_LINK_PENDING       1
 326 #define TCON_LINK_IN_TREE       2
 327         unsigned long           tl_time;
 328         atomic_t                tl_count;
 329         struct cifsTconInfo     *tl_tcon;
 330 };
 331
 332 extern struct tcon_link *cifs_sb_tlink(struct cifs_sb_info *cifs_sb);
 333
 334 static inline struct cifsTconInfo *
 335 tlink_tcon(struct tcon_link *tlink)
 336 {
 337         return tlink->tl_tcon;
 338 }
 339
 340 extern void cifs_put_tlink(struct tcon_link *tlink);
 341
 342 static inline struct tcon_link *
 343 cifs_get_tlink(struct tcon_link *tlink)
 344 {
 345         if (tlink && !IS_ERR(tlink))
 346                 atomic_inc(&tlink->tl_count);
 347         return tlink;
 348 }
 349
 350 /* This function is always expected to succeed */
 351 extern struct cifsTconInfo *cifs_sb_master_tcon(struct cifs_sb_info *cifs_sb);
 352
 353 /*
 354  * This info hangs off the cifsFileInfo structure, pointed to by llist.
 355  * This is used to track byte stream locks on the file
 356  */
 357 struct cifsLockInfo {
 358         struct list_head llist; /* pointer to next cifsLockInfo */
 359         __u64 offset;
 360         __u64 length;
 361         __u8 type;
 362 };
 363
 364 /*
 365  * One of these for each open instance of a file
 366  */
 367 struct cifs_search_info {
 368         loff_t index_of_last_entry;
 369         __u16 entries_in_buffer;
 370         __u16 info_level;
 371         __u32 resume_key;
 372         char *ntwrk_buf_start;
 373         char *srch_entries_start;
 374         char *last_entry;
 375         char *presume_name;
 376         unsigned int resume_name_len;
 377         bool endOfSearch:1;
 378         bool emptyDir:1;
 379         bool unicode:1;
 380         bool smallBuf:1; /* so we know which buf_release function to call */
 381 };
 382
 383 struct cifsFileInfo {
 384         struct list_head tlist; /* pointer to next fid owned by tcon */
 385         struct list_head flist; /* next fid (file instance) for this inode */
 386         unsigned int uid;       /* allows finding which FileInfo structure */
 387         __u32 pid;              /* process id who opened file */
 388         __u16 netfid;           /* file id from remote */
 389         /* BB add lock scope info here if needed */ ;
 390         /* lock scope id (0 if none) */
 391         struct dentry *dentry;
 392         unsigned int f_flags;
 393         struct tcon_link *tlink;
 394         struct mutex lock_mutex;
 395         struct list_head llist; /* list of byte range locks we have. */
 396         bool invalidHandle:1;   /* file closed via session abend */
 397         bool oplock_break_cancelled:1;
 398         atomic_t count;         /* reference count */
 399         struct mutex fh_mutex; /* prevents reopen race after dead ses*/
 400         struct cifs_search_info srch_inf;
 401         struct work_struct oplock_break; /* work for oplock breaks */
 402 };
 403
 404 /* Take a reference on the file private data */
 405 static inline void cifsFileInfo_get(struct cifsFileInfo *cifs_file)
 406 {
 407         atomic_inc(&cifs_file->count);
 408 }
 409
 410 void cifsFileInfo_put(struct cifsFileInfo *cifs_file);
 411
 412 /*
 413  * One of these for each file inode
 414  */
 415
 416 struct cifsInodeInfo {
 417         struct list_head lockList;
 418         /* BB add in lists for dirty pages i.e. write caching info for oplock */
 419         struct list_head openFileList;
 420         int write_behind_rc;
 421         __u32 cifsAttrs; /* e.g. DOS archive bit, sparse, compressed, system */
 422         unsigned long time;     /* jiffies of last update/check of inode */
 423         bool clientCanCacheRead:1;      /* read oplock */
 424         bool clientCanCacheAll:1;       /* read and writebehind oplock */
 425         bool delete_pending:1;          /* DELETE_ON_CLOSE is set */
 426         bool invalid_mapping:1;         /* pagecache is invalid */
 427         u64  server_eof;                /* current file size on server */
 428         u64  uniqueid;                  /* server inode number */
 429 #ifdef CONFIG_CIFS_FSCACHE
 430         struct fscache_cookie *fscache;
 431 #endif
 432         struct inode vfs_inode;
 433 };
 434
 435 static inline struct cifsInodeInfo *
 436 CIFS_I(struct inode *inode)
 437 {
 438         return container_of(inode, struct cifsInodeInfo, vfs_inode);
 439 }
 440
 441 static inline struct cifs_sb_info *
 442 CIFS_SB(struct super_block *sb)
 443 {
 444         return sb->s_fs_info;
 445 }
 446
 447 static inline char CIFS_DIR_SEP(const struct cifs_sb_info *cifs_sb)
 448 {
 449         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_POSIX_PATHS)
 450                 return '/';
 451         else
 452                 return '\\';
 453 }
 454
 455 #ifdef CONFIG_CIFS_STATS
 456 #define cifs_stats_inc atomic_inc
 457
 458 static inline void cifs_stats_bytes_written(struct cifsTconInfo *tcon,
 459                                             unsigned int bytes)
 460 {
 461         if (bytes) {
 462                 spin_lock(&tcon->stat_lock);
 463                 tcon->bytes_written += bytes;
 464                 spin_unlock(&tcon->stat_lock);
 465         }
 466 }
 467
 468 static inline void cifs_stats_bytes_read(struct cifsTconInfo *tcon,
 469                                          unsigned int bytes)
 470 {
 471         spin_lock(&tcon->stat_lock);
 472         tcon->bytes_read += bytes;
 473         spin_unlock(&tcon->stat_lock);
 474 }
 475 #else
 476
 477 #define  cifs_stats_inc(field) do {} while (0)
 478 #define  cifs_stats_bytes_written(tcon, bytes) do {} while (0)
 479 #define  cifs_stats_bytes_read(tcon, bytes) do {} while (0)
 480
 481 #endif
 482
 483 /* one of these for every pending CIFS request to the server */
 484 struct mid_q_entry {
 485         struct list_head qhead; /* mids waiting on reply from this server */
 486         __u16 mid;              /* multiplex id */
 487         __u16 pid;              /* process id */
 488         __u32 sequence_number;  /* for CIFS signing */
 489         unsigned long when_alloc;  /* when mid was created */
 490 #ifdef CONFIG_CIFS_STATS2
 491         unsigned long when_sent; /* time when smb send finished */
 492         unsigned long when_received; /* when demux complete (taken off wire) */
 493 #endif
 494         struct task_struct *tsk;        /* task waiting for response */
 495         struct smb_hdr *resp_buf;       /* response buffer */
 496         int midState;   /* wish this were enum but can not pass to wait_event */
 497         __u8 command;   /* smb command code */
 498         bool largeBuf:1;        /* if valid response, is pointer to large buf */
 499         bool multiRsp:1;        /* multiple trans2 responses for one request  */
 500         bool multiEnd:1;        /* both received */
 501 };
 502
 503 struct oplock_q_entry {
 504         struct list_head qhead;
 505         struct inode *pinode;
 506         struct cifsTconInfo *tcon;
 507         __u16 netfid;
 508 };
 509
 510 /* for pending dnotify requests */
 511 struct dir_notify_req {
 512         struct list_head lhead;
 513         __le16 Pid;
 514         __le16 PidHigh;
 515         __u16 Mid;
 516         __u16 Tid;
 517         __u16 Uid;
 518         __u16 netfid;
 519         __u32 filter; /* CompletionFilter (for multishot) */
 520         int multishot;
 521         struct file *pfile;
 522 };
 523
 524 struct dfs_info3_param {
 525         int flags; /* DFSREF_REFERRAL_SERVER, DFSREF_STORAGE_SERVER*/
 526         int path_consumed;
 527         int server_type;
 528         int ref_flag;
 529         char *path_name;
 530         char *node_name;
 531 };
 532
 533 /*
 534  * common struct for holding inode info when searching for or updating an
 535  * inode with new info
 536  */
 537
 538 #define CIFS_FATTR_DFS_REFERRAL         0x1
 539 #define CIFS_FATTR_DELETE_PENDING       0x2
 540 #define CIFS_FATTR_NEED_REVAL           0x4
 541 #define CIFS_FATTR_INO_COLLISION        0x8
 542
 543 struct cifs_fattr {
 544         u32             cf_flags;
 545         u32             cf_cifsattrs;
 546         u64             cf_uniqueid;
 547         u64             cf_eof;
 548         u64             cf_bytes;
 549         uid_t           cf_uid;
 550         gid_t           cf_gid;
 551         umode_t         cf_mode;
 552         dev_t           cf_rdev;
 553         unsigned int    cf_nlink;
 554         unsigned int    cf_dtype;
 555         struct timespec cf_atime;
 556         struct timespec cf_mtime;
 557         struct timespec cf_ctime;
 558 };
 559
 560 static inline void free_dfs_info_param(struct dfs_info3_param *param)
 561 {
 562         if (param) {
 563                 kfree(param->path_name);
 564                 kfree(param->node_name);
 565                 kfree(param);
 566         }
 567 }
 568
 569 static inline void free_dfs_info_array(struct dfs_info3_param *param,
 570                                        int number_of_items)
 571 {
 572         int i;
 573         if ((number_of_items == 0) || (param == NULL))
 574                 return;
 575         for (i = 0; i < number_of_items; i++) {
 576                 kfree(param[i].path_name);
 577                 kfree(param[i].node_name);
 578         }
 579         kfree(param);
 580 }
 581
 582 #define   MID_FREE 0
 583 #define   MID_REQUEST_ALLOCATED 1
 584 #define   MID_REQUEST_SUBMITTED 2
 585 #define   MID_RESPONSE_RECEIVED 4
 586 #define   MID_RETRY_NEEDED      8 /* session closed while this request out */
 587 #define   MID_NO_RESP_NEEDED 0x10
 588
 589 /* Types of response buffer returned from SendReceive2 */
 590 #define   CIFS_NO_BUFFER        0    /* Response buffer not returned */
 591 #define   CIFS_SMALL_BUFFER     1
 592 #define   CIFS_LARGE_BUFFER     2
 593 #define   CIFS_IOVEC            4    /* array of response buffers */
 594
 595 /* Type of Request to SendReceive2 */
 596 #define   CIFS_STD_OP           0    /* normal request timeout */
 597 #define   CIFS_LONG_OP          1    /* long op (up to 45 sec, oplock time) */
 598 #define   CIFS_VLONG_OP         2    /* sloow op - can take up to 180 seconds */
 599 #define   CIFS_BLOCKING_OP      4    /* operation can block */
 600 #define   CIFS_ASYNC_OP         8    /* do not wait for response */
 601 #define   CIFS_TIMEOUT_MASK 0x00F    /* only one of 5 above set in req */
 602 #define   CIFS_LOG_ERROR    0x010    /* log NT STATUS if non-zero */
 603 #define   CIFS_LARGE_BUF_OP 0x020    /* large request buffer */
 604 #define   CIFS_NO_RESP      0x040    /* no response buffer required */
 605
 606 /* Security Flags: indicate type of session setup needed */
 607 #define   CIFSSEC_MAY_SIGN      0x00001
 608 #define   CIFSSEC_MAY_NTLM      0x00002
 609 #define   CIFSSEC_MAY_NTLMV2    0x00004
 610 #define   CIFSSEC_MAY_KRB5      0x00008
 611 #ifdef CONFIG_CIFS_WEAK_PW_HASH
 612 #define   CIFSSEC_MAY_LANMAN    0x00010
 613 #define   CIFSSEC_MAY_PLNTXT    0x00020
 614 #else
 615 #define   CIFSSEC_MAY_LANMAN    0
 616 #define   CIFSSEC_MAY_PLNTXT    0
 617 #endif /* weak passwords */
 618 #define   CIFSSEC_MAY_SEAL      0x00040 /* not supported yet */
 619 #define   CIFSSEC_MAY_NTLMSSP   0x00080 /* raw ntlmssp with ntlmv2 */
 620
 621 #define   CIFSSEC_MUST_SIGN     0x01001
 622 /* note that only one of the following can be set so the
 623 result of setting MUST flags more than once will be to
 624 require use of the stronger protocol */
 625 #define   CIFSSEC_MUST_NTLM     0x02002
 626 #define   CIFSSEC_MUST_NTLMV2   0x04004
 627 #define   CIFSSEC_MUST_KRB5     0x08008
 628 #ifdef CONFIG_CIFS_WEAK_PW_HASH
 629 #define   CIFSSEC_MUST_LANMAN   0x10010
 630 #define   CIFSSEC_MUST_PLNTXT   0x20020
 631 #ifdef CONFIG_CIFS_UPCALL
 632 #define   CIFSSEC_MASK          0xBF0BF /* allows weak security but also krb5 */
 633 #else
 634 #define   CIFSSEC_MASK          0xB70B7 /* current flags supported if weak */
 635 #endif /* UPCALL */
 636 #else /* do not allow weak pw hash */
 637 #ifdef CONFIG_CIFS_UPCALL
 638 #define   CIFSSEC_MASK          0x8F08F /* flags supported if no weak allowed */
 639 #else
 640 #define   CIFSSEC_MASK          0x87087 /* flags supported if no weak allowed */
 641 #endif /* UPCALL */
 642 #endif /* WEAK_PW_HASH */
 643 #define   CIFSSEC_MUST_SEAL     0x40040 /* not supported yet */
 644 #define   CIFSSEC_MUST_NTLMSSP  0x80080 /* raw ntlmssp with ntlmv2 */
 645
 646 #define   CIFSSEC_DEF (CIFSSEC_MAY_SIGN | CIFSSEC_MAY_NTLM | CIFSSEC_MAY_NTLMV2)
 647 #define   CIFSSEC_MAX (CIFSSEC_MUST_SIGN | CIFSSEC_MUST_NTLMV2)
 648 #define   CIFSSEC_AUTH_MASK (CIFSSEC_MAY_NTLM | CIFSSEC_MAY_NTLMV2 | CIFSSEC_MAY_LANMAN | CIFSSEC_MAY_PLNTXT | CIFSSEC_MAY_KRB5 | CIFSSEC_MAY_NTLMSSP)
 649 /*
 650  *****************************************************************
 651  * All constants go here
 652  *****************************************************************
 653  */
 654
 655 #define UID_HASH (16)
 656
 657 /*
 658  * Note that ONE module should define _DECLARE_GLOBALS_HERE to cause the
 659  * following to be declared.
 660  */
 661
 662 /****************************************************************************
 663  *  Locking notes.  All updates to global variables and lists should be
 664  *                  protected by spinlocks or semaphores.
 665  *
 666  *  Spinlocks
 667  *  ---------
 668  *  GlobalMid_Lock protects:
 669  *      list operations on pending_mid_q and oplockQ
 670  *      updates to XID counters, multiplex id  and SMB sequence numbers
 671  *  GlobalSMBSesLock protects:
 672  *      list operations on tcp and SMB session lists and tCon lists
 673  *  f_owner.lock protects certain per file struct operations
 674  *  mapping->page_lock protects certain per page operations
 675  *
 676  *  Semaphores
 677  *  ----------
 678  *  sesSem     operations on smb session
 679  *  tconSem    operations on tree connection
 680  *  fh_sem      file handle reconnection operations
 681  *
 682  ****************************************************************************/
 683
 684 #ifdef DECLARE_GLOBALS_HERE
 685 #define GLOBAL_EXTERN
 686 #else
 687 #define GLOBAL_EXTERN extern
 688 #endif
 689
 690 /*
 691  * the list of TCP_Server_Info structures, ie each of the sockets
 692  * connecting our client to a distinct server (ip address), is
 693  * chained together by cifs_tcp_ses_list. The list of all our SMB
 694  * sessions (and from that the tree connections) can be found
 695  * by iterating over cifs_tcp_ses_list
 696  */
 697 GLOBAL_EXTERN struct list_head          cifs_tcp_ses_list;
 698
 699 /*
 700  * This lock protects the cifs_tcp_ses_list, the list of smb sessions per
 701  * tcp session, and the list of tcon's per smb session. It also protects
 702  * the reference counters for the server, smb session, and tcon. Finally,
 703  * changes to the tcon->tidStatus should be done while holding this lock.
 704  */
 705 GLOBAL_EXTERN spinlock_t                cifs_tcp_ses_lock;
 706
 707 /*
 708  * This lock protects the cifs_file->llist and cifs_file->flist
 709  * list operations, and updates to some flags (cifs_file->invalidHandle)
 710  * It will be moved to either use the tcon->stat_lock or equivalent later.
 711  * If cifs_tcp_ses_lock and the lock below are both needed to be held, then
 712  * the cifs_tcp_ses_lock must be grabbed first and released last.
 713  */
 714 GLOBAL_EXTERN spinlock_t        cifs_file_list_lock;
 715
 716 /* Outstanding dir notify requests */
 717 GLOBAL_EXTERN struct list_head GlobalDnotifyReqList;
 718 /* DirNotify response queue */
 719 GLOBAL_EXTERN struct list_head GlobalDnotifyRsp_Q;
 720
 721 /*
 722  * Global transaction id (XID) information
 723  */
 724 GLOBAL_EXTERN unsigned int GlobalCurrentXid;    /* protected by GlobalMid_Sem */
 725 GLOBAL_EXTERN unsigned int GlobalTotalActiveXid; /* prot by GlobalMid_Sem */
 726 GLOBAL_EXTERN unsigned int GlobalMaxActiveXid;  /* prot by GlobalMid_Sem */
 727 GLOBAL_EXTERN spinlock_t GlobalMid_Lock;  /* protects above & list operations */
 728                                           /* on midQ entries */
 729 GLOBAL_EXTERN char Local_System_Name[15];
 730
 731 /*
 732  *  Global counters, updated atomically
 733  */
 734 GLOBAL_EXTERN atomic_t sesInfoAllocCount;
 735 GLOBAL_EXTERN atomic_t tconInfoAllocCount;
 736 GLOBAL_EXTERN atomic_t tcpSesAllocCount;
 737 GLOBAL_EXTERN atomic_t tcpSesReconnectCount;
 738 GLOBAL_EXTERN atomic_t tconInfoReconnectCount;
 739
 740 /* Various Debug counters */
 741 GLOBAL_EXTERN atomic_t bufAllocCount;    /* current number allocated  */
 742 #ifdef CONFIG_CIFS_STATS2
 743 GLOBAL_EXTERN atomic_t totBufAllocCount; /* total allocated over all time */
 744 GLOBAL_EXTERN atomic_t totSmBufAllocCount;
 745 #endif
 746 GLOBAL_EXTERN atomic_t smBufAllocCount;
 747 GLOBAL_EXTERN atomic_t midCount;
 748
 749 /* Misc globals */
 750 GLOBAL_EXTERN unsigned int multiuser_mount; /* if enabled allows new sessions
 751                                 to be established on existing mount if we
 752                                 have the uid/password or Kerberos credential
 753                                 or equivalent for current user */
 754 GLOBAL_EXTERN unsigned int oplockEnabled;
 755 GLOBAL_EXTERN unsigned int experimEnabled;
 756 GLOBAL_EXTERN unsigned int lookupCacheEnabled;
 757 GLOBAL_EXTERN unsigned int global_secflags;     /* if on, session setup sent
 758                                 with more secure ntlmssp2 challenge/resp */
 759 GLOBAL_EXTERN unsigned int sign_CIFS_PDUs;  /* enable smb packet signing */
 760 GLOBAL_EXTERN unsigned int linuxExtEnabled;/*enable Linux/Unix CIFS extensions*/
 761 GLOBAL_EXTERN unsigned int CIFSMaxBufSize;  /* max size not including hdr */
 762 GLOBAL_EXTERN unsigned int cifs_min_rcv;    /* min size of big ntwrk buf pool */
 763 GLOBAL_EXTERN unsigned int cifs_min_small;  /* min size of small buf pool */
 764 GLOBAL_EXTERN unsigned int cifs_max_pending; /* MAX requests at once to server*/
 765
 766 void cifs_oplock_break(struct work_struct *work);
 767 void cifs_oplock_break_get(struct cifsFileInfo *cfile);
 768 void cifs_oplock_break_put(struct cifsFileInfo *cfile);
 769
 770 extern const struct slow_work_ops cifs_oplock_break_ops;
 771
 772 #endif  /* _CIFS_GLOB_H */