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 #include <crypto/internal/hash.h>
  29 #include <linux/scatterlist.h>
  30
  31 /*
  32  * The sizes of various internal tables and strings
  33  */
  34 #define MAX_UID_INFO 16
  35 #define MAX_SES_INFO 2
  36 #define MAX_TCON_INFO 4
  37
  38 #define MAX_TREE_SIZE (2 + MAX_SERVER_SIZE + 1 + MAX_SHARE_SIZE + 1)
  39 #define MAX_SERVER_SIZE 15
  40 #define MAX_SHARE_SIZE  64      /* used to be 20, this should still be enough */
  41 #define MAX_USERNAME_SIZE 32    /* 32 is to allow for 15 char names + null
  42                                    termination then *2 for unicode versions */
  43 #define MAX_PASSWORD_SIZE 512  /* max for windows seems to be 256 wide chars */
  44
  45 #define CIFS_MIN_RCV_POOL 4
  46
  47 /*
  48  * MAX_REQ is the maximum number of requests that WE will send
  49  * on one socket concurrently. It also matches the most common
  50  * value of max multiplex returned by servers.  We may
  51  * eventually want to use the negotiated value (in case
  52  * future servers can handle more) when we are more confident that
  53  * we will not have problems oveloading the socket with pending
  54  * write data.
  55  */
  56 #define CIFS_MAX_REQ 50
  57
  58 #define RFC1001_NAME_LEN 15
  59 #define RFC1001_NAME_LEN_WITH_NULL (RFC1001_NAME_LEN + 1)
  60
  61 /* currently length of NIP6_FMT */
  62 #define SERVER_NAME_LENGTH 40
  63 #define SERVER_NAME_LEN_WITH_NULL     (SERVER_NAME_LENGTH + 1)
  64
  65 /* used to define string lengths for reversing unicode strings */
  66 /*         (256+1)*2 = 514                                     */
  67 /*           (max path length + 1 for null) * 2 for unicode    */
  68 #define MAX_NAME 514
  69
  70 #include "cifspdu.h"
  71
  72 #ifndef XATTR_DOS_ATTRIB
  73 #define XATTR_DOS_ATTRIB "user.DOSATTRIB"
  74 #endif
  75
  76 /*
  77  * CIFS vfs client Status information (based on what we know.)
  78  */
  79
  80 /* associated with each tcp and smb session */
  81 enum statusEnum {
  82         CifsNew = 0,
  83         CifsGood,
  84         CifsExiting,
  85         CifsNeedReconnect
  86 };
  87
  88 enum securityEnum {
  89         LANMAN = 0,                     /* Legacy LANMAN auth */
  90         NTLM,                   /* Legacy NTLM012 auth with NTLM hash */
  91         NTLMv2,                 /* Legacy NTLM auth with NTLMv2 hash */
  92         RawNTLMSSP,             /* NTLMSSP without SPNEGO, NTLMv2 hash */
  93 /*      NTLMSSP, */ /* can use rawNTLMSSP instead of NTLMSSP via SPNEGO */
  94         Kerberos,               /* Kerberos via SPNEGO */
  95 };
  96
  97 enum protocolEnum {
  98         TCP = 0,
  99         SCTP
 100         /* Netbios frames protocol not supported at this time */
 101 };
 102
 103 struct session_key {
 104         unsigned int len;
 105         char *response;
 106 };
 107
 108 /* crypto security descriptor definition */
 109 struct sdesc {
 110         struct shash_desc shash;
 111         char ctx[];
 112 };
 113
 114 /* crypto hashing related structure/fields, not specific to a sec mech */
 115 struct cifs_secmech {
 116         struct crypto_shash *hmacmd5; /* hmac-md5 hash function */
 117         struct crypto_shash *md5; /* md5 hash function */
 118         struct sdesc *sdeschmacmd5;  /* ctxt to generate ntlmv2 hash, CR1 */
 119         struct sdesc *sdescmd5; /* ctxt to generate cifs/smb signature */
 120 };
 121
 122 /* per smb session structure/fields */
 123 struct ntlmssp_auth {
 124         __u32 client_flags; /* sent by client in type 1 ntlmsssp exchange */
 125         __u32 server_flags; /* sent by server in type 2 ntlmssp exchange */
 126         unsigned char ciphertext[CIFS_CPHTXT_SIZE]; /* sent to server */
 127         char cryptkey[CIFS_CRYPTO_KEY_SIZE]; /* used by ntlmssp */
 128 };
 129
 130 struct cifs_cred {
 131         int uid;
 132         int gid;
 133         int mode;
 134         int cecount;
 135         struct cifs_sid osid;
 136         struct cifs_sid gsid;
 137         struct cifs_ntace *ntaces;
 138         struct cifs_ace *aces;
 139 };
 140
 141 /*
 142  *****************************************************************
 143  * Except the CIFS PDUs themselves all the
 144  * globally interesting structs should go here
 145  *****************************************************************
 146  */
 147
 148 struct TCP_Server_Info {
 149         struct list_head tcp_ses_list;
 150         struct list_head smb_ses_list;
 151         int srv_count; /* reference counter */
 152         /* 15 character server name + 0x20 16th byte indicating type = srv */
 153         char server_RFC1001_name[RFC1001_NAME_LEN_WITH_NULL];
 154         char *hostname; /* hostname portion of UNC string */
 155         struct socket *ssocket;
 156         union {
 157                 struct sockaddr_in sockAddr;
 158                 struct sockaddr_in6 sockAddr6;
 159         } addr;
 160         struct sockaddr_storage srcaddr; /* locally bind to this IP */
 161         wait_queue_head_t response_q;
 162         wait_queue_head_t request_q; /* if more than maxmpx to srvr must block*/
 163         struct list_head pending_mid_q;
 164         void *Server_NlsInfo;   /* BB - placeholder for future NLS info  */
 165         unsigned short server_codepage; /* codepage for the server    */
 166         enum protocolEnum protocolType;
 167         char versionMajor;
 168         char versionMinor;
 169         bool svlocal:1;                 /* local server or remote */
 170         bool noblocksnd;                /* use blocking sendmsg */
 171         bool noautotune;                /* do not autotune send buf sizes */
 172         bool tcp_nodelay;
 173         atomic_t inFlight;  /* number of requests on the wire to server */
 174 #ifdef CONFIG_CIFS_STATS2
 175         atomic_t inSend; /* requests trying to send */
 176         atomic_t num_waiters;   /* blocked waiting to get in sendrecv */
 177 #endif
 178         enum statusEnum tcpStatus; /* what we think the status is */
 179         struct mutex srv_mutex;
 180         struct task_struct *tsk;
 181         char server_GUID[16];
 182         char secMode;
 183         enum securityEnum secType;
 184         unsigned int maxReq;    /* Clients should submit no more */
 185         /* than maxReq distinct unanswered SMBs to the server when using  */
 186         /* multiplexed reads or writes */
 187         unsigned int maxBuf;    /* maxBuf specifies the maximum */
 188         /* message size the server can send or receive for non-raw SMBs */
 189         unsigned int max_rw;    /* maxRw specifies the maximum */
 190         /* message size the server can send or receive for */
 191         /* SMB_COM_WRITE_RAW or SMB_COM_READ_RAW. */
 192         unsigned int max_vcs;   /* maximum number of smb sessions, at least
 193                                    those that can be specified uniquely with
 194                                    vcnumbers */
 195         char sessid[4];         /* unique token id for this session */
 196         /* (returned on Negotiate */
 197         int capabilities; /* allow selective disabling of caps by smb sess */
 198         int timeAdj;  /* Adjust for difference in server time zone in sec */
 199         __u16 CurrentMid;         /* multiplex id - rotating counter */
 200         char cryptkey[CIFS_CRYPTO_KEY_SIZE]; /* used by ntlm, ntlmv2 etc */
 201         /* 16th byte of RFC1001 workstation name is always null */
 202         char workstation_RFC1001_name[RFC1001_NAME_LEN_WITH_NULL];
 203         __u32 sequence_number; /* needed for CIFS PDU signature */
 204         struct session_key session_key;
 205         unsigned long lstrp; /* when we got last response from this server */
 206         u16 dialect; /* dialect index that server chose */
 207         struct cifs_secmech secmech; /* crypto sec mech functs, descriptors */
 208         /* extended security flavors that server supports */
 209         bool    sec_kerberos;           /* supports plain Kerberos */
 210         bool    sec_mskerberos;         /* supports legacy MS Kerberos */
 211         bool    sec_kerberosu2u;        /* supports U2U Kerberos */
 212         bool    sec_ntlmssp;            /* supports NTLMSSP */
 213         bool session_estab; /* mark when very first sess is established */
 214 #ifdef CONFIG_CIFS_FSCACHE
 215         struct fscache_cookie   *fscache; /* client index cache cookie */
 216 #endif
 217 };
 218
 219 /*
 220  * Session structure.  One of these for each uid session with a particular host
 221  */
 222 struct cifsSesInfo {
 223         struct list_head smb_ses_list;
 224         struct list_head tcon_list;
 225         struct mutex session_mutex;
 226         struct TCP_Server_Info *server; /* pointer to server info */
 227         int ses_count;          /* reference counter */
 228         enum statusEnum status;
 229         unsigned overrideSecFlg;  /* if non-zero override global sec flags */
 230         __u16 ipc_tid;          /* special tid for connection to IPC share */
 231         __u16 flags;
 232         __u16 vcnum;
 233         char *serverOS;         /* name of operating system underlying server */
 234         char *serverNOS;        /* name of network operating system of server */
 235         char *serverDomain;     /* security realm of server */
 236         int Suid;               /* remote smb uid  */
 237         uid_t linux_uid;        /* overriding owner of files on the mount */
 238         uid_t cred_uid;         /* owner of credentials */
 239         int capabilities;
 240         char serverName[SERVER_NAME_LEN_WITH_NULL * 2]; /* BB make bigger for
 241                                 TCP names - will ipv6 and sctp addresses fit? */
 242         char userName[MAX_USERNAME_SIZE + 1];
 243         char *domainName;
 244         char *password;
 245         struct session_key auth_key;
 246         struct ntlmssp_auth *ntlmssp; /* ciphertext, flags, server challenge */
 247         bool need_reconnect:1; /* connection reset, uid now invalid */
 248 };
 249 /* no more than one of the following three session flags may be set */
 250 #define CIFS_SES_NT4 1
 251 #define CIFS_SES_OS2 2
 252 #define CIFS_SES_W9X 4
 253 /* following flag is set for old servers such as OS2 (and Win95?)
 254    which do not negotiate NTLM or POSIX dialects, but instead
 255    negotiate one of the older LANMAN dialects */
 256 #define CIFS_SES_LANMAN 8
 257 /*
 258  * there is one of these for each connection to a resource on a particular
 259  * session
 260  */
 261 struct cifsTconInfo {
 262         struct list_head tcon_list;
 263         int tc_count;
 264         struct list_head openFileList;
 265         struct cifsSesInfo *ses;        /* pointer to session associated with */
 266         char treeName[MAX_TREE_SIZE + 1]; /* UNC name of resource in ASCII */
 267         char *nativeFileSystem;
 268         char *password;         /* for share-level security */
 269         __u16 tid;              /* The 2 byte tree id */
 270         __u16 Flags;            /* optional support bits */
 271         enum statusEnum tidStatus;
 272 #ifdef CONFIG_CIFS_STATS
 273         atomic_t num_smbs_sent;
 274         atomic_t num_writes;
 275         atomic_t num_reads;
 276         atomic_t num_flushes;
 277         atomic_t num_oplock_brks;
 278         atomic_t num_opens;
 279         atomic_t num_closes;
 280         atomic_t num_deletes;
 281         atomic_t num_mkdirs;
 282         atomic_t num_posixopens;
 283         atomic_t num_posixmkdirs;
 284         atomic_t num_rmdirs;
 285         atomic_t num_renames;
 286         atomic_t num_t2renames;
 287         atomic_t num_ffirst;
 288         atomic_t num_fnext;
 289         atomic_t num_fclose;
 290         atomic_t num_hardlinks;
 291         atomic_t num_symlinks;
 292         atomic_t num_locks;
 293         atomic_t num_acl_get;
 294         atomic_t num_acl_set;
 295 #ifdef CONFIG_CIFS_STATS2
 296         unsigned long long time_writes;
 297         unsigned long long time_reads;
 298         unsigned long long time_opens;
 299         unsigned long long time_deletes;
 300         unsigned long long time_closes;
 301         unsigned long long time_mkdirs;
 302         unsigned long long time_rmdirs;
 303         unsigned long long time_renames;
 304         unsigned long long time_t2renames;
 305         unsigned long long time_ffirst;
 306         unsigned long long time_fnext;
 307         unsigned long long time_fclose;
 308 #endif /* CONFIG_CIFS_STATS2 */
 309         __u64    bytes_read;
 310         __u64    bytes_written;
 311         spinlock_t stat_lock;
 312 #endif /* CONFIG_CIFS_STATS */
 313         FILE_SYSTEM_DEVICE_INFO fsDevInfo;
 314         FILE_SYSTEM_ATTRIBUTE_INFO fsAttrInfo; /* ok if fs name truncated */
 315         FILE_SYSTEM_UNIX_INFO fsUnixInfo;
 316         bool ipc:1;             /* set if connection to IPC$ eg for RPC/PIPES */
 317         bool retry:1;
 318         bool nocase:1;
 319         bool seal:1;      /* transport encryption for this mounted share */
 320         bool unix_ext:1;  /* if false disable Linux extensions to CIFS protocol
 321                                 for this mount even if server would support */
 322         bool local_lease:1; /* check leases (only) on local system not remote */
 323         bool broken_posix_open; /* e.g. Samba server versions < 3.3.2, 3.2.9 */
 324         bool need_reconnect:1; /* connection reset, tid now invalid */
 325 #ifdef CONFIG_CIFS_FSCACHE
 326         u64 resource_id;                /* server resource id */
 327         struct fscache_cookie *fscache; /* cookie for share */
 328 #endif
 329         /* BB add field for back pointer to sb struct(s)? */
 330 };
 331
 332 /*
 333  * This is a refcounted and timestamped container for a tcon pointer. The
 334  * container holds a tcon reference. It is considered safe to free one of
 335  * these when the tl_count goes to 0. The tl_time is the time of the last
 336  * "get" on the container.
 337  */
 338 struct tcon_link {
 339         struct rb_node          tl_rbnode;
 340         uid_t                   tl_uid;
 341         unsigned long           tl_flags;
 342 #define TCON_LINK_MASTER        0
 343 #define TCON_LINK_PENDING       1
 344 #define TCON_LINK_IN_TREE       2
 345         unsigned long           tl_time;
 346         atomic_t                tl_count;
 347         struct cifsTconInfo     *tl_tcon;
 348 };
 349
 350 extern struct tcon_link *cifs_sb_tlink(struct cifs_sb_info *cifs_sb);
 351
 352 static inline struct cifsTconInfo *
 353 tlink_tcon(struct tcon_link *tlink)
 354 {
 355         return tlink->tl_tcon;
 356 }
 357
 358 extern void cifs_put_tlink(struct tcon_link *tlink);
 359
 360 static inline struct tcon_link *
 361 cifs_get_tlink(struct tcon_link *tlink)
 362 {
 363         if (tlink && !IS_ERR(tlink))
 364                 atomic_inc(&tlink->tl_count);
 365         return tlink;
 366 }
 367
 368 /* This function is always expected to succeed */
 369 extern struct cifsTconInfo *cifs_sb_master_tcon(struct cifs_sb_info *cifs_sb);
 370
 371 /*
 372  * This info hangs off the cifsFileInfo structure, pointed to by llist.
 373  * This is used to track byte stream locks on the file
 374  */
 375 struct cifsLockInfo {
 376         struct list_head llist; /* pointer to next cifsLockInfo */
 377         __u64 offset;
 378         __u64 length;
 379         __u8 type;
 380 };
 381
 382 /*
 383  * One of these for each open instance of a file
 384  */
 385 struct cifs_search_info {
 386         loff_t index_of_last_entry;
 387         __u16 entries_in_buffer;
 388         __u16 info_level;
 389         __u32 resume_key;
 390         char *ntwrk_buf_start;
 391         char *srch_entries_start;
 392         char *last_entry;
 393         char *presume_name;
 394         unsigned int resume_name_len;
 395         bool endOfSearch:1;
 396         bool emptyDir:1;
 397         bool unicode:1;
 398         bool smallBuf:1; /* so we know which buf_release function to call */
 399 };
 400
 401 struct cifsFileInfo {
 402         struct list_head tlist; /* pointer to next fid owned by tcon */
 403         struct list_head flist; /* next fid (file instance) for this inode */
 404         unsigned int uid;       /* allows finding which FileInfo structure */
 405         __u32 pid;              /* process id who opened file */
 406         __u16 netfid;           /* file id from remote */
 407         /* BB add lock scope info here if needed */ ;
 408         /* lock scope id (0 if none) */
 409         struct dentry *dentry;
 410         unsigned int f_flags;
 411         struct tcon_link *tlink;
 412         struct mutex lock_mutex;
 413         struct list_head llist; /* list of byte range locks we have. */
 414         bool invalidHandle:1;   /* file closed via session abend */
 415         bool oplock_break_cancelled:1;
 416         int count;              /* refcount protected by cifs_file_list_lock */
 417         struct mutex fh_mutex; /* prevents reopen race after dead ses*/
 418         struct cifs_search_info srch_inf;
 419         struct work_struct oplock_break; /* work for oplock breaks */
 420 };
 421
 422 /*
 423  * Take a reference on the file private data. Must be called with
 424  * cifs_file_list_lock held.
 425  */
 426 static inline void cifsFileInfo_get(struct cifsFileInfo *cifs_file)
 427 {
 428         ++cifs_file->count;
 429 }
 430
 431 void cifsFileInfo_put(struct cifsFileInfo *cifs_file);
 432
 433 /*
 434  * One of these for each file inode
 435  */
 436
 437 struct cifsInodeInfo {
 438         struct list_head lockList;
 439         /* BB add in lists for dirty pages i.e. write caching info for oplock */
 440         struct list_head openFileList;
 441         __u32 cifsAttrs; /* e.g. DOS archive bit, sparse, compressed, system */
 442         unsigned long time;     /* jiffies of last update/check of inode */
 443         bool clientCanCacheRead:1;      /* read oplock */
 444         bool clientCanCacheAll:1;       /* read and writebehind oplock */
 445         bool delete_pending:1;          /* DELETE_ON_CLOSE is set */
 446         bool invalid_mapping:1;         /* pagecache is invalid */
 447         u64  server_eof;                /* current file size on server */
 448         u64  uniqueid;                  /* server inode number */
 449 #ifdef CONFIG_CIFS_FSCACHE
 450         struct fscache_cookie *fscache;
 451 #endif
 452         struct inode vfs_inode;
 453 };
 454
 455 static inline struct cifsInodeInfo *
 456 CIFS_I(struct inode *inode)
 457 {
 458         return container_of(inode, struct cifsInodeInfo, vfs_inode);
 459 }
 460
 461 static inline struct cifs_sb_info *
 462 CIFS_SB(struct super_block *sb)
 463 {
 464         return sb->s_fs_info;
 465 }
 466
 467 static inline char CIFS_DIR_SEP(const struct cifs_sb_info *cifs_sb)
 468 {
 469         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_POSIX_PATHS)
 470                 return '/';
 471         else
 472                 return '\\';
 473 }
 474
 475 #ifdef CONFIG_CIFS_STATS
 476 #define cifs_stats_inc atomic_inc
 477
 478 static inline void cifs_stats_bytes_written(struct cifsTconInfo *tcon,
 479                                             unsigned int bytes)
 480 {
 481         if (bytes) {
 482                 spin_lock(&tcon->stat_lock);
 483                 tcon->bytes_written += bytes;
 484                 spin_unlock(&tcon->stat_lock);
 485         }
 486 }
 487
 488 static inline void cifs_stats_bytes_read(struct cifsTconInfo *tcon,
 489                                          unsigned int bytes)
 490 {
 491         spin_lock(&tcon->stat_lock);
 492         tcon->bytes_read += bytes;
 493         spin_unlock(&tcon->stat_lock);
 494 }
 495 #else
 496
 497 #define  cifs_stats_inc(field) do {} while (0)
 498 #define  cifs_stats_bytes_written(tcon, bytes) do {} while (0)
 499 #define  cifs_stats_bytes_read(tcon, bytes) do {} while (0)
 500
 501 #endif
 502
 503 /* one of these for every pending CIFS request to the server */
 504 struct mid_q_entry {
 505         struct list_head qhead; /* mids waiting on reply from this server */
 506         __u16 mid;              /* multiplex id */
 507         __u16 pid;              /* process id */
 508         __u32 sequence_number;  /* for CIFS signing */
 509         unsigned long when_alloc;  /* when mid was created */
 510 #ifdef CONFIG_CIFS_STATS2
 511         unsigned long when_sent; /* time when smb send finished */
 512         unsigned long when_received; /* when demux complete (taken off wire) */
 513 #endif
 514         struct task_struct *tsk;        /* task waiting for response */
 515         struct smb_hdr *resp_buf;       /* response buffer */
 516         int midState;   /* wish this were enum but can not pass to wait_event */
 517         __u8 command;   /* smb command code */
 518         bool largeBuf:1;        /* if valid response, is pointer to large buf */
 519         bool multiRsp:1;        /* multiple trans2 responses for one request  */
 520         bool multiEnd:1;        /* both received */
 521 };
 522
 523 struct oplock_q_entry {
 524         struct list_head qhead;
 525         struct inode *pinode;
 526         struct cifsTconInfo *tcon;
 527         __u16 netfid;
 528 };
 529
 530 /* for pending dnotify requests */
 531 struct dir_notify_req {
 532         struct list_head lhead;
 533         __le16 Pid;
 534         __le16 PidHigh;
 535         __u16 Mid;
 536         __u16 Tid;
 537         __u16 Uid;
 538         __u16 netfid;
 539         __u32 filter; /* CompletionFilter (for multishot) */
 540         int multishot;
 541         struct file *pfile;
 542 };
 543
 544 struct dfs_info3_param {
 545         int flags; /* DFSREF_REFERRAL_SERVER, DFSREF_STORAGE_SERVER*/
 546         int path_consumed;
 547         int server_type;
 548         int ref_flag;
 549         char *path_name;
 550         char *node_name;
 551 };
 552
 553 /*
 554  * common struct for holding inode info when searching for or updating an
 555  * inode with new info
 556  */
 557
 558 #define CIFS_FATTR_DFS_REFERRAL         0x1
 559 #define CIFS_FATTR_DELETE_PENDING       0x2
 560 #define CIFS_FATTR_NEED_REVAL           0x4
 561 #define CIFS_FATTR_INO_COLLISION        0x8
 562
 563 struct cifs_fattr {
 564         u32             cf_flags;
 565         u32             cf_cifsattrs;
 566         u64             cf_uniqueid;
 567         u64             cf_eof;
 568         u64             cf_bytes;
 569         uid_t           cf_uid;
 570         gid_t           cf_gid;
 571         umode_t         cf_mode;
 572         dev_t           cf_rdev;
 573         unsigned int    cf_nlink;
 574         unsigned int    cf_dtype;
 575         struct timespec cf_atime;
 576         struct timespec cf_mtime;
 577         struct timespec cf_ctime;
 578 };
 579
 580 static inline void free_dfs_info_param(struct dfs_info3_param *param)
 581 {
 582         if (param) {
 583                 kfree(param->path_name);
 584                 kfree(param->node_name);
 585                 kfree(param);
 586         }
 587 }
 588
 589 static inline void free_dfs_info_array(struct dfs_info3_param *param,
 590                                        int number_of_items)
 591 {
 592         int i;
 593         if ((number_of_items == 0) || (param == NULL))
 594                 return;
 595         for (i = 0; i < number_of_items; i++) {
 596                 kfree(param[i].path_name);
 597                 kfree(param[i].node_name);
 598         }
 599         kfree(param);
 600 }
 601
 602 #define   MID_FREE 0
 603 #define   MID_REQUEST_ALLOCATED 1
 604 #define   MID_REQUEST_SUBMITTED 2
 605 #define   MID_RESPONSE_RECEIVED 4
 606 #define   MID_RETRY_NEEDED      8 /* session closed while this request out */
 607 #define   MID_NO_RESP_NEEDED 0x10
 608
 609 /* Types of response buffer returned from SendReceive2 */
 610 #define   CIFS_NO_BUFFER        0    /* Response buffer not returned */
 611 #define   CIFS_SMALL_BUFFER     1
 612 #define   CIFS_LARGE_BUFFER     2
 613 #define   CIFS_IOVEC            4    /* array of response buffers */
 614
 615 /* Type of Request to SendReceive2 */
 616 #define   CIFS_STD_OP           0    /* normal request timeout */
 617 #define   CIFS_LONG_OP          1    /* long op (up to 45 sec, oplock time) */
 618 #define   CIFS_VLONG_OP         2    /* sloow op - can take up to 180 seconds */
 619 #define   CIFS_BLOCKING_OP      4    /* operation can block */
 620 #define   CIFS_ASYNC_OP         8    /* do not wait for response */
 621 #define   CIFS_TIMEOUT_MASK 0x00F    /* only one of 5 above set in req */
 622 #define   CIFS_LOG_ERROR    0x010    /* log NT STATUS if non-zero */
 623 #define   CIFS_LARGE_BUF_OP 0x020    /* large request buffer */
 624 #define   CIFS_NO_RESP      0x040    /* no response buffer required */
 625
 626 /* Security Flags: indicate type of session setup needed */
 627 #define   CIFSSEC_MAY_SIGN      0x00001
 628 #define   CIFSSEC_MAY_NTLM      0x00002
 629 #define   CIFSSEC_MAY_NTLMV2    0x00004
 630 #define   CIFSSEC_MAY_KRB5      0x00008
 631 #ifdef CONFIG_CIFS_WEAK_PW_HASH
 632 #define   CIFSSEC_MAY_LANMAN    0x00010
 633 #define   CIFSSEC_MAY_PLNTXT    0x00020
 634 #else
 635 #define   CIFSSEC_MAY_LANMAN    0
 636 #define   CIFSSEC_MAY_PLNTXT    0
 637 #endif /* weak passwords */
 638 #define   CIFSSEC_MAY_SEAL      0x00040 /* not supported yet */
 639 #define   CIFSSEC_MAY_NTLMSSP   0x00080 /* raw ntlmssp with ntlmv2 */
 640
 641 #define   CIFSSEC_MUST_SIGN     0x01001
 642 /* note that only one of the following can be set so the
 643 result of setting MUST flags more than once will be to
 644 require use of the stronger protocol */
 645 #define   CIFSSEC_MUST_NTLM     0x02002
 646 #define   CIFSSEC_MUST_NTLMV2   0x04004
 647 #define   CIFSSEC_MUST_KRB5     0x08008
 648 #ifdef CONFIG_CIFS_WEAK_PW_HASH
 649 #define   CIFSSEC_MUST_LANMAN   0x10010
 650 #define   CIFSSEC_MUST_PLNTXT   0x20020
 651 #ifdef CONFIG_CIFS_UPCALL
 652 #define   CIFSSEC_MASK          0xBF0BF /* allows weak security but also krb5 */
 653 #else
 654 #define   CIFSSEC_MASK          0xB70B7 /* current flags supported if weak */
 655 #endif /* UPCALL */
 656 #else /* do not allow weak pw hash */
 657 #ifdef CONFIG_CIFS_UPCALL
 658 #define   CIFSSEC_MASK          0x8F08F /* flags supported if no weak allowed */
 659 #else
 660 #define   CIFSSEC_MASK          0x87087 /* flags supported if no weak allowed */
 661 #endif /* UPCALL */
 662 #endif /* WEAK_PW_HASH */
 663 #define   CIFSSEC_MUST_SEAL     0x40040 /* not supported yet */
 664 #define   CIFSSEC_MUST_NTLMSSP  0x80080 /* raw ntlmssp with ntlmv2 */
 665
 666 #define   CIFSSEC_DEF (CIFSSEC_MAY_SIGN | CIFSSEC_MAY_NTLM | CIFSSEC_MAY_NTLMV2)
 667 #define   CIFSSEC_MAX (CIFSSEC_MUST_SIGN | CIFSSEC_MUST_NTLMV2)
 668 #define   CIFSSEC_AUTH_MASK (CIFSSEC_MAY_NTLM | CIFSSEC_MAY_NTLMV2 | CIFSSEC_MAY_LANMAN | CIFSSEC_MAY_PLNTXT | CIFSSEC_MAY_KRB5 | CIFSSEC_MAY_NTLMSSP)
 669 /*
 670  *****************************************************************
 671  * All constants go here
 672  *****************************************************************
 673  */
 674
 675 #define UID_HASH (16)
 676
 677 /*
 678  * Note that ONE module should define _DECLARE_GLOBALS_HERE to cause the
 679  * following to be declared.
 680  */
 681
 682 /****************************************************************************
 683  *  Locking notes.  All updates to global variables and lists should be
 684  *                  protected by spinlocks or semaphores.
 685  *
 686  *  Spinlocks
 687  *  ---------
 688  *  GlobalMid_Lock protects:
 689  *      list operations on pending_mid_q and oplockQ
 690  *      updates to XID counters, multiplex id  and SMB sequence numbers
 691  *  cifs_file_list_lock protects:
 692  *      list operations on tcp and SMB session lists and tCon lists
 693  *  f_owner.lock protects certain per file struct operations
 694  *  mapping->page_lock protects certain per page operations
 695  *
 696  *  Semaphores
 697  *  ----------
 698  *  sesSem     operations on smb session
 699  *  tconSem    operations on tree connection
 700  *  fh_sem      file handle reconnection operations
 701  *
 702  ****************************************************************************/
 703
 704 #ifdef DECLARE_GLOBALS_HERE
 705 #define GLOBAL_EXTERN
 706 #else
 707 #define GLOBAL_EXTERN extern
 708 #endif
 709
 710 /*
 711  * the list of TCP_Server_Info structures, ie each of the sockets
 712  * connecting our client to a distinct server (ip address), is
 713  * chained together by cifs_tcp_ses_list. The list of all our SMB
 714  * sessions (and from that the tree connections) can be found
 715  * by iterating over cifs_tcp_ses_list
 716  */
 717 GLOBAL_EXTERN struct list_head          cifs_tcp_ses_list;
 718
 719 /*
 720  * This lock protects the cifs_tcp_ses_list, the list of smb sessions per
 721  * tcp session, and the list of tcon's per smb session. It also protects
 722  * the reference counters for the server, smb session, and tcon. Finally,
 723  * changes to the tcon->tidStatus should be done while holding this lock.
 724  */
 725 GLOBAL_EXTERN spinlock_t                cifs_tcp_ses_lock;
 726
 727 /*
 728  * This lock protects the cifs_file->llist and cifs_file->flist
 729  * list operations, and updates to some flags (cifs_file->invalidHandle)
 730  * It will be moved to either use the tcon->stat_lock or equivalent later.
 731  * If cifs_tcp_ses_lock and the lock below are both needed to be held, then
 732  * the cifs_tcp_ses_lock must be grabbed first and released last.
 733  */
 734 GLOBAL_EXTERN spinlock_t        cifs_file_list_lock;
 735
 736 /* Outstanding dir notify requests */
 737 GLOBAL_EXTERN struct list_head GlobalDnotifyReqList;
 738 /* DirNotify response queue */
 739 GLOBAL_EXTERN struct list_head GlobalDnotifyRsp_Q;
 740
 741 /*
 742  * Global transaction id (XID) information
 743  */
 744 GLOBAL_EXTERN unsigned int GlobalCurrentXid;    /* protected by GlobalMid_Sem */
 745 GLOBAL_EXTERN unsigned int GlobalTotalActiveXid; /* prot by GlobalMid_Sem */
 746 GLOBAL_EXTERN unsigned int GlobalMaxActiveXid;  /* prot by GlobalMid_Sem */
 747 GLOBAL_EXTERN spinlock_t GlobalMid_Lock;  /* protects above & list operations */
 748                                           /* on midQ entries */
 749 GLOBAL_EXTERN char Local_System_Name[15];
 750
 751 /*
 752  *  Global counters, updated atomically
 753  */
 754 GLOBAL_EXTERN atomic_t sesInfoAllocCount;
 755 GLOBAL_EXTERN atomic_t tconInfoAllocCount;
 756 GLOBAL_EXTERN atomic_t tcpSesAllocCount;
 757 GLOBAL_EXTERN atomic_t tcpSesReconnectCount;
 758 GLOBAL_EXTERN atomic_t tconInfoReconnectCount;
 759
 760 /* Various Debug counters */
 761 GLOBAL_EXTERN atomic_t bufAllocCount;    /* current number allocated  */
 762 #ifdef CONFIG_CIFS_STATS2
 763 GLOBAL_EXTERN atomic_t totBufAllocCount; /* total allocated over all time */
 764 GLOBAL_EXTERN atomic_t totSmBufAllocCount;
 765 #endif
 766 GLOBAL_EXTERN atomic_t smBufAllocCount;
 767 GLOBAL_EXTERN atomic_t midCount;
 768
 769 /* Misc globals */
 770 GLOBAL_EXTERN unsigned int multiuser_mount; /* if enabled allows new sessions
 771                                 to be established on existing mount if we
 772                                 have the uid/password or Kerberos credential
 773                                 or equivalent for current user */
 774 GLOBAL_EXTERN unsigned int oplockEnabled;
 775 GLOBAL_EXTERN unsigned int experimEnabled;
 776 GLOBAL_EXTERN unsigned int lookupCacheEnabled;
 777 GLOBAL_EXTERN unsigned int global_secflags;     /* if on, session setup sent
 778                                 with more secure ntlmssp2 challenge/resp */
 779 GLOBAL_EXTERN unsigned int sign_CIFS_PDUs;  /* enable smb packet signing */
 780 GLOBAL_EXTERN unsigned int linuxExtEnabled;/*enable Linux/Unix CIFS extensions*/
 781 GLOBAL_EXTERN unsigned int CIFSMaxBufSize;  /* max size not including hdr */
 782 GLOBAL_EXTERN unsigned int cifs_min_rcv;    /* min size of big ntwrk buf pool */
 783 GLOBAL_EXTERN unsigned int cifs_min_small;  /* min size of small buf pool */
 784 GLOBAL_EXTERN unsigned int cifs_max_pending; /* MAX requests at once to server*/
 785
 786 void cifs_oplock_break(struct work_struct *work);
 787 void cifs_oplock_break_get(struct cifsFileInfo *cfile);
 788 void cifs_oplock_break_put(struct cifsFileInfo *cfile);
 789
 790 extern const struct slow_work_ops cifs_oplock_break_ops;
 791
 792 #endif  /* _CIFS_GLOB_H */