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  * default attribute cache timeout (jiffies)
  49  */
  50 #define CIFS_DEF_ACTIMEO (1 * HZ)
  51
  52 /*
  53  * max attribute cache timeout (jiffies) - 2^30
  54  */
  55 #define CIFS_MAX_ACTIMEO (1 << 30)
  56
  57 /*
  58  * MAX_REQ is the maximum number of requests that WE will send
  59  * on one socket concurrently. It also matches the most common
  60  * value of max multiplex returned by servers.  We may
  61  * eventually want to use the negotiated value (in case
  62  * future servers can handle more) when we are more confident that
  63  * we will not have problems oveloading the socket with pending
  64  * write data.
  65  */
  66 #define CIFS_MAX_REQ 50
  67
  68 #define RFC1001_NAME_LEN 15
  69 #define RFC1001_NAME_LEN_WITH_NULL (RFC1001_NAME_LEN + 1)
  70
  71 /* currently length of NIP6_FMT */
  72 #define SERVER_NAME_LENGTH 40
  73 #define SERVER_NAME_LEN_WITH_NULL     (SERVER_NAME_LENGTH + 1)
  74
  75 /* used to define string lengths for reversing unicode strings */
  76 /*         (256+1)*2 = 514                                     */
  77 /*           (max path length + 1 for null) * 2 for unicode    */
  78 #define MAX_NAME 514
  79
  80 #include "cifspdu.h"
  81
  82 #ifndef XATTR_DOS_ATTRIB
  83 #define XATTR_DOS_ATTRIB "user.DOSATTRIB"
  84 #endif
  85
  86 /*
  87  * CIFS vfs client Status information (based on what we know.)
  88  */
  89
  90 /* associated with each tcp and smb session */
  91 enum statusEnum {
  92         CifsNew = 0,
  93         CifsGood,
  94         CifsExiting,
  95         CifsNeedReconnect
  96 };
  97
  98 enum securityEnum {
  99         LANMAN = 0,                     /* Legacy LANMAN auth */
 100         NTLM,                   /* Legacy NTLM012 auth with NTLM hash */
 101         NTLMv2,                 /* Legacy NTLM auth with NTLMv2 hash */
 102         RawNTLMSSP,             /* NTLMSSP without SPNEGO, NTLMv2 hash */
 103 /*      NTLMSSP, */ /* can use rawNTLMSSP instead of NTLMSSP via SPNEGO */
 104         Kerberos,               /* Kerberos via SPNEGO */
 105 };
 106
 107 enum protocolEnum {
 108         TCP = 0,
 109         SCTP
 110         /* Netbios frames protocol not supported at this time */
 111 };
 112
 113 struct session_key {
 114         unsigned int len;
 115         char *response;
 116 };
 117
 118 /* crypto security descriptor definition */
 119 struct sdesc {
 120         struct shash_desc shash;
 121         char ctx[];
 122 };
 123
 124 /* crypto hashing related structure/fields, not specific to a sec mech */
 125 struct cifs_secmech {
 126         struct crypto_shash *hmacmd5; /* hmac-md5 hash function */
 127         struct crypto_shash *md5; /* md5 hash function */
 128         struct sdesc *sdeschmacmd5;  /* ctxt to generate ntlmv2 hash, CR1 */
 129         struct sdesc *sdescmd5; /* ctxt to generate cifs/smb signature */
 130 };
 131
 132 /* per smb session structure/fields */
 133 struct ntlmssp_auth {
 134         __u32 client_flags; /* sent by client in type 1 ntlmsssp exchange */
 135         __u32 server_flags; /* sent by server in type 2 ntlmssp exchange */
 136         unsigned char ciphertext[CIFS_CPHTXT_SIZE]; /* sent to server */
 137         char cryptkey[CIFS_CRYPTO_KEY_SIZE]; /* used by ntlmssp */
 138 };
 139
 140 struct cifs_cred {
 141         int uid;
 142         int gid;
 143         int mode;
 144         int cecount;
 145         struct cifs_sid osid;
 146         struct cifs_sid gsid;
 147         struct cifs_ntace *ntaces;
 148         struct cifs_ace *aces;
 149 };
 150
 151 /*
 152  *****************************************************************
 153  * Except the CIFS PDUs themselves all the
 154  * globally interesting structs should go here
 155  *****************************************************************
 156  */
 157
 158 struct TCP_Server_Info {
 159         struct list_head tcp_ses_list;
 160         struct list_head smb_ses_list;
 161         int srv_count; /* reference counter */
 162         /* 15 character server name + 0x20 16th byte indicating type = srv */
 163         char server_RFC1001_name[RFC1001_NAME_LEN_WITH_NULL];
 164         enum statusEnum tcpStatus; /* what we think the status is */
 165         char *hostname; /* hostname portion of UNC string */
 166         struct socket *ssocket;
 167         struct sockaddr_storage dstaddr;
 168         struct sockaddr_storage srcaddr; /* locally bind to this IP */
 169         wait_queue_head_t response_q;
 170         wait_queue_head_t request_q; /* if more than maxmpx to srvr must block*/
 171         struct list_head pending_mid_q;
 172         bool noblocksnd;                /* use blocking sendmsg */
 173         bool noautotune;                /* do not autotune send buf sizes */
 174         bool tcp_nodelay;
 175         atomic_t inFlight;  /* number of requests on the wire to server */
 176         struct mutex srv_mutex;
 177         struct task_struct *tsk;
 178         char server_GUID[16];
 179         char secMode;
 180         bool session_estab; /* mark when very first sess is established */
 181         u16 dialect; /* dialect index that server chose */
 182         enum securityEnum secType;
 183         unsigned int maxReq;    /* Clients should submit no more */
 184         /* than maxReq distinct unanswered SMBs to the server when using  */
 185         /* multiplexed reads or writes */
 186         unsigned int maxBuf;    /* maxBuf specifies the maximum */
 187         /* message size the server can send or receive for non-raw SMBs */
 188         unsigned int max_rw;    /* maxRw specifies the maximum */
 189         /* message size the server can send or receive for */
 190         /* SMB_COM_WRITE_RAW or SMB_COM_READ_RAW. */
 191         unsigned int max_vcs;   /* maximum number of smb sessions, at least
 192                                    those that can be specified uniquely with
 193                                    vcnumbers */
 194         int capabilities; /* allow selective disabling of caps by smb sess */
 195         int timeAdj;  /* Adjust for difference in server time zone in sec */
 196         __u16 CurrentMid;         /* multiplex id - rotating counter */
 197         char cryptkey[CIFS_CRYPTO_KEY_SIZE]; /* used by ntlm, ntlmv2 etc */
 198         /* 16th byte of RFC1001 workstation name is always null */
 199         char workstation_RFC1001_name[RFC1001_NAME_LEN_WITH_NULL];
 200         __u32 sequence_number; /* for signing, protected by srv_mutex */
 201         struct session_key session_key;
 202         unsigned long lstrp; /* when we got last response from this server */
 203         struct cifs_secmech secmech; /* crypto sec mech functs, descriptors */
 204         /* extended security flavors that server supports */
 205         bool    sec_ntlmssp;            /* supports NTLMSSP */
 206         bool    sec_kerberosu2u;        /* supports U2U Kerberos */
 207         bool    sec_kerberos;           /* supports plain Kerberos */
 208         bool    sec_mskerberos;         /* supports legacy MS Kerberos */
 209         struct delayed_work     echo; /* echo ping workqueue job */
 210 #ifdef CONFIG_CIFS_FSCACHE
 211         struct fscache_cookie   *fscache; /* client index cache cookie */
 212 #endif
 213 #ifdef CONFIG_CIFS_STATS2
 214         atomic_t inSend; /* requests trying to send */
 215         atomic_t num_waiters;   /* blocked waiting to get in sendrecv */
 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         bool clientCanCacheRead;        /* read oplock */
 443         bool clientCanCacheAll;         /* read and writebehind oplock */
 444         bool delete_pending;            /* DELETE_ON_CLOSE is set */
 445         bool invalid_mapping;           /* pagecache is invalid */
 446         unsigned long time;             /* jiffies of last update of inode */
 447         u64  server_eof;                /* current file size on server */
 448         u64  uniqueid;                  /* server inode number */
 449         u64  createtime;                /* creation time on server */
 450 #ifdef CONFIG_CIFS_FSCACHE
 451         struct fscache_cookie *fscache;
 452 #endif
 453         struct inode vfs_inode;
 454 };
 455
 456 static inline struct cifsInodeInfo *
 457 CIFS_I(struct inode *inode)
 458 {
 459         return container_of(inode, struct cifsInodeInfo, vfs_inode);
 460 }
 461
 462 static inline struct cifs_sb_info *
 463 CIFS_SB(struct super_block *sb)
 464 {
 465         return sb->s_fs_info;
 466 }
 467
 468 static inline char CIFS_DIR_SEP(const struct cifs_sb_info *cifs_sb)
 469 {
 470         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_POSIX_PATHS)
 471                 return '/';
 472         else
 473                 return '\\';
 474 }
 475
 476 #ifdef CONFIG_CIFS_STATS
 477 #define cifs_stats_inc atomic_inc
 478
 479 static inline void cifs_stats_bytes_written(struct cifsTconInfo *tcon,
 480                                             unsigned int bytes)
 481 {
 482         if (bytes) {
 483                 spin_lock(&tcon->stat_lock);
 484                 tcon->bytes_written += bytes;
 485                 spin_unlock(&tcon->stat_lock);
 486         }
 487 }
 488
 489 static inline void cifs_stats_bytes_read(struct cifsTconInfo *tcon,
 490                                          unsigned int bytes)
 491 {
 492         spin_lock(&tcon->stat_lock);
 493         tcon->bytes_read += bytes;
 494         spin_unlock(&tcon->stat_lock);
 495 }
 496 #else
 497
 498 #define  cifs_stats_inc(field) do {} while (0)
 499 #define  cifs_stats_bytes_written(tcon, bytes) do {} while (0)
 500 #define  cifs_stats_bytes_read(tcon, bytes) do {} while (0)
 501
 502 #endif
 503
 504 struct mid_q_entry;
 505
 506 /*
 507  * This is the prototype for the mid callback function. When creating one,
 508  * take special care to avoid deadlocks. Things to bear in mind:
 509  *
 510  * - it will be called by cifsd
 511  * - the GlobalMid_Lock will be held
 512  * - the mid will be removed from the pending_mid_q list
 513  */
 514 typedef void (mid_callback_t)(struct mid_q_entry *mid);
 515
 516 /* one of these for every pending CIFS request to the server */
 517 struct mid_q_entry {
 518         struct list_head qhead; /* mids waiting on reply from this server */
 519         __u16 mid;              /* multiplex id */
 520         __u16 pid;              /* process id */
 521         __u32 sequence_number;  /* for CIFS signing */
 522         unsigned long when_alloc;  /* when mid was created */
 523 #ifdef CONFIG_CIFS_STATS2
 524         unsigned long when_sent; /* time when smb send finished */
 525         unsigned long when_received; /* when demux complete (taken off wire) */
 526 #endif
 527         mid_callback_t *callback; /* call completion callback */
 528         void *callback_data;      /* general purpose pointer for callback */
 529         struct smb_hdr *resp_buf;       /* response buffer */
 530         int midState;   /* wish this were enum but can not pass to wait_event */
 531         __u8 command;   /* smb command code */
 532         bool largeBuf:1;        /* if valid response, is pointer to large buf */
 533         bool multiRsp:1;        /* multiple trans2 responses for one request  */
 534         bool multiEnd:1;        /* both received */
 535 };
 536
 537 struct oplock_q_entry {
 538         struct list_head qhead;
 539         struct inode *pinode;
 540         struct cifsTconInfo *tcon;
 541         __u16 netfid;
 542 };
 543
 544 /* for pending dnotify requests */
 545 struct dir_notify_req {
 546         struct list_head lhead;
 547         __le16 Pid;
 548         __le16 PidHigh;
 549         __u16 Mid;
 550         __u16 Tid;
 551         __u16 Uid;
 552         __u16 netfid;
 553         __u32 filter; /* CompletionFilter (for multishot) */
 554         int multishot;
 555         struct file *pfile;
 556 };
 557
 558 struct dfs_info3_param {
 559         int flags; /* DFSREF_REFERRAL_SERVER, DFSREF_STORAGE_SERVER*/
 560         int path_consumed;
 561         int server_type;
 562         int ref_flag;
 563         char *path_name;
 564         char *node_name;
 565 };
 566
 567 /*
 568  * common struct for holding inode info when searching for or updating an
 569  * inode with new info
 570  */
 571
 572 #define CIFS_FATTR_DFS_REFERRAL         0x1
 573 #define CIFS_FATTR_DELETE_PENDING       0x2
 574 #define CIFS_FATTR_NEED_REVAL           0x4
 575 #define CIFS_FATTR_INO_COLLISION        0x8
 576
 577 struct cifs_fattr {
 578         u32             cf_flags;
 579         u32             cf_cifsattrs;
 580         u64             cf_uniqueid;
 581         u64             cf_eof;
 582         u64             cf_bytes;
 583         u64             cf_createtime;
 584         uid_t           cf_uid;
 585         gid_t           cf_gid;
 586         umode_t         cf_mode;
 587         dev_t           cf_rdev;
 588         unsigned int    cf_nlink;
 589         unsigned int    cf_dtype;
 590         struct timespec cf_atime;
 591         struct timespec cf_mtime;
 592         struct timespec cf_ctime;
 593 };
 594
 595 static inline void free_dfs_info_param(struct dfs_info3_param *param)
 596 {
 597         if (param) {
 598                 kfree(param->path_name);
 599                 kfree(param->node_name);
 600                 kfree(param);
 601         }
 602 }
 603
 604 static inline void free_dfs_info_array(struct dfs_info3_param *param,
 605                                        int number_of_items)
 606 {
 607         int i;
 608         if ((number_of_items == 0) || (param == NULL))
 609                 return;
 610         for (i = 0; i < number_of_items; i++) {
 611                 kfree(param[i].path_name);
 612                 kfree(param[i].node_name);
 613         }
 614         kfree(param);
 615 }
 616
 617 #define   MID_FREE 0
 618 #define   MID_REQUEST_ALLOCATED 1
 619 #define   MID_REQUEST_SUBMITTED 2
 620 #define   MID_RESPONSE_RECEIVED 4
 621 #define   MID_RETRY_NEEDED      8 /* session closed while this request out */
 622 #define   MID_NO_RESP_NEEDED 0x10
 623
 624 /* Types of response buffer returned from SendReceive2 */
 625 #define   CIFS_NO_BUFFER        0    /* Response buffer not returned */
 626 #define   CIFS_SMALL_BUFFER     1
 627 #define   CIFS_LARGE_BUFFER     2
 628 #define   CIFS_IOVEC            4    /* array of response buffers */
 629
 630 /* Type of Request to SendReceive2 */
 631 #define   CIFS_BLOCKING_OP      1    /* operation can block */
 632 #define   CIFS_ASYNC_OP         2    /* do not wait for response */
 633 #define   CIFS_TIMEOUT_MASK 0x003    /* only one of above set in req */
 634 #define   CIFS_LOG_ERROR    0x010    /* log NT STATUS if non-zero */
 635 #define   CIFS_LARGE_BUF_OP 0x020    /* large request buffer */
 636 #define   CIFS_NO_RESP      0x040    /* no response buffer required */
 637
 638 /* Security Flags: indicate type of session setup needed */
 639 #define   CIFSSEC_MAY_SIGN      0x00001
 640 #define   CIFSSEC_MAY_NTLM      0x00002
 641 #define   CIFSSEC_MAY_NTLMV2    0x00004
 642 #define   CIFSSEC_MAY_KRB5      0x00008
 643 #ifdef CONFIG_CIFS_WEAK_PW_HASH
 644 #define   CIFSSEC_MAY_LANMAN    0x00010
 645 #define   CIFSSEC_MAY_PLNTXT    0x00020
 646 #else
 647 #define   CIFSSEC_MAY_LANMAN    0
 648 #define   CIFSSEC_MAY_PLNTXT    0
 649 #endif /* weak passwords */
 650 #define   CIFSSEC_MAY_SEAL      0x00040 /* not supported yet */
 651 #define   CIFSSEC_MAY_NTLMSSP   0x00080 /* raw ntlmssp with ntlmv2 */
 652
 653 #define   CIFSSEC_MUST_SIGN     0x01001
 654 /* note that only one of the following can be set so the
 655 result of setting MUST flags more than once will be to
 656 require use of the stronger protocol */
 657 #define   CIFSSEC_MUST_NTLM     0x02002
 658 #define   CIFSSEC_MUST_NTLMV2   0x04004
 659 #define   CIFSSEC_MUST_KRB5     0x08008
 660 #ifdef CONFIG_CIFS_WEAK_PW_HASH
 661 #define   CIFSSEC_MUST_LANMAN   0x10010
 662 #define   CIFSSEC_MUST_PLNTXT   0x20020
 663 #ifdef CONFIG_CIFS_UPCALL
 664 #define   CIFSSEC_MASK          0xBF0BF /* allows weak security but also krb5 */
 665 #else
 666 #define   CIFSSEC_MASK          0xB70B7 /* current flags supported if weak */
 667 #endif /* UPCALL */
 668 #else /* do not allow weak pw hash */
 669 #ifdef CONFIG_CIFS_UPCALL
 670 #define   CIFSSEC_MASK          0x8F08F /* flags supported if no weak allowed */
 671 #else
 672 #define   CIFSSEC_MASK          0x87087 /* flags supported if no weak allowed */
 673 #endif /* UPCALL */
 674 #endif /* WEAK_PW_HASH */
 675 #define   CIFSSEC_MUST_SEAL     0x40040 /* not supported yet */
 676 #define   CIFSSEC_MUST_NTLMSSP  0x80080 /* raw ntlmssp with ntlmv2 */
 677
 678 #define   CIFSSEC_DEF (CIFSSEC_MAY_SIGN | CIFSSEC_MAY_NTLM | CIFSSEC_MAY_NTLMV2)
 679 #define   CIFSSEC_MAX (CIFSSEC_MUST_SIGN | CIFSSEC_MUST_NTLMV2)
 680 #define   CIFSSEC_AUTH_MASK (CIFSSEC_MAY_NTLM | CIFSSEC_MAY_NTLMV2 | CIFSSEC_MAY_LANMAN | CIFSSEC_MAY_PLNTXT | CIFSSEC_MAY_KRB5 | CIFSSEC_MAY_NTLMSSP)
 681 /*
 682  *****************************************************************
 683  * All constants go here
 684  *****************************************************************
 685  */
 686
 687 #define UID_HASH (16)
 688
 689 /*
 690  * Note that ONE module should define _DECLARE_GLOBALS_HERE to cause the
 691  * following to be declared.
 692  */
 693
 694 /****************************************************************************
 695  *  Locking notes.  All updates to global variables and lists should be
 696  *                  protected by spinlocks or semaphores.
 697  *
 698  *  Spinlocks
 699  *  ---------
 700  *  GlobalMid_Lock protects:
 701  *      list operations on pending_mid_q and oplockQ
 702  *      updates to XID counters, multiplex id  and SMB sequence numbers
 703  *  cifs_file_list_lock protects:
 704  *      list operations on tcp and SMB session lists and tCon lists
 705  *  f_owner.lock protects certain per file struct operations
 706  *  mapping->page_lock protects certain per page operations
 707  *
 708  *  Semaphores
 709  *  ----------
 710  *  sesSem     operations on smb session
 711  *  tconSem    operations on tree connection
 712  *  fh_sem      file handle reconnection operations
 713  *
 714  ****************************************************************************/
 715
 716 #ifdef DECLARE_GLOBALS_HERE
 717 #define GLOBAL_EXTERN
 718 #else
 719 #define GLOBAL_EXTERN extern
 720 #endif
 721
 722 /*
 723  * the list of TCP_Server_Info structures, ie each of the sockets
 724  * connecting our client to a distinct server (ip address), is
 725  * chained together by cifs_tcp_ses_list. The list of all our SMB
 726  * sessions (and from that the tree connections) can be found
 727  * by iterating over cifs_tcp_ses_list
 728  */
 729 GLOBAL_EXTERN struct list_head          cifs_tcp_ses_list;
 730
 731 /*
 732  * This lock protects the cifs_tcp_ses_list, the list of smb sessions per
 733  * tcp session, and the list of tcon's per smb session. It also protects
 734  * the reference counters for the server, smb session, and tcon. Finally,
 735  * changes to the tcon->tidStatus should be done while holding this lock.
 736  */
 737 GLOBAL_EXTERN spinlock_t                cifs_tcp_ses_lock;
 738
 739 /*
 740  * This lock protects the cifs_file->llist and cifs_file->flist
 741  * list operations, and updates to some flags (cifs_file->invalidHandle)
 742  * It will be moved to either use the tcon->stat_lock or equivalent later.
 743  * If cifs_tcp_ses_lock and the lock below are both needed to be held, then
 744  * the cifs_tcp_ses_lock must be grabbed first and released last.
 745  */
 746 GLOBAL_EXTERN spinlock_t        cifs_file_list_lock;
 747
 748 /* Outstanding dir notify requests */
 749 GLOBAL_EXTERN struct list_head GlobalDnotifyReqList;
 750 /* DirNotify response queue */
 751 GLOBAL_EXTERN struct list_head GlobalDnotifyRsp_Q;
 752
 753 /*
 754  * Global transaction id (XID) information
 755  */
 756 GLOBAL_EXTERN unsigned int GlobalCurrentXid;    /* protected by GlobalMid_Sem */
 757 GLOBAL_EXTERN unsigned int GlobalTotalActiveXid; /* prot by GlobalMid_Sem */
 758 GLOBAL_EXTERN unsigned int GlobalMaxActiveXid;  /* prot by GlobalMid_Sem */
 759 GLOBAL_EXTERN spinlock_t GlobalMid_Lock;  /* protects above & list operations */
 760                                           /* on midQ entries */
 761 /*
 762  *  Global counters, updated atomically
 763  */
 764 GLOBAL_EXTERN atomic_t sesInfoAllocCount;
 765 GLOBAL_EXTERN atomic_t tconInfoAllocCount;
 766 GLOBAL_EXTERN atomic_t tcpSesAllocCount;
 767 GLOBAL_EXTERN atomic_t tcpSesReconnectCount;
 768 GLOBAL_EXTERN atomic_t tconInfoReconnectCount;
 769
 770 /* Various Debug counters */
 771 GLOBAL_EXTERN atomic_t bufAllocCount;    /* current number allocated  */
 772 #ifdef CONFIG_CIFS_STATS2
 773 GLOBAL_EXTERN atomic_t totBufAllocCount; /* total allocated over all time */
 774 GLOBAL_EXTERN atomic_t totSmBufAllocCount;
 775 #endif
 776 GLOBAL_EXTERN atomic_t smBufAllocCount;
 777 GLOBAL_EXTERN atomic_t midCount;
 778
 779 /* Misc globals */
 780 GLOBAL_EXTERN unsigned int multiuser_mount; /* if enabled allows new sessions
 781                                 to be established on existing mount if we
 782                                 have the uid/password or Kerberos credential
 783                                 or equivalent for current user */
 784 GLOBAL_EXTERN unsigned int oplockEnabled;
 785 GLOBAL_EXTERN unsigned int experimEnabled;
 786 GLOBAL_EXTERN unsigned int lookupCacheEnabled;
 787 GLOBAL_EXTERN unsigned int global_secflags;     /* if on, session setup sent
 788                                 with more secure ntlmssp2 challenge/resp */
 789 GLOBAL_EXTERN unsigned int sign_CIFS_PDUs;  /* enable smb packet signing */
 790 GLOBAL_EXTERN unsigned int linuxExtEnabled;/*enable Linux/Unix CIFS extensions*/
 791 GLOBAL_EXTERN unsigned int CIFSMaxBufSize;  /* max size not including hdr */
 792 GLOBAL_EXTERN unsigned int cifs_min_rcv;    /* min size of big ntwrk buf pool */
 793 GLOBAL_EXTERN unsigned int cifs_min_small;  /* min size of small buf pool */
 794 GLOBAL_EXTERN unsigned int cifs_max_pending; /* MAX requests at once to server*/
 795
 796 /* reconnect after this many failed echo attempts */
 797 GLOBAL_EXTERN unsigned short echo_retries;
 798
 799 void cifs_oplock_break(struct work_struct *work);
 800 void cifs_oplock_break_get(struct cifsFileInfo *cfile);
 801 void cifs_oplock_break_put(struct cifsFileInfo *cfile);
 802
 803 extern const struct slow_work_ops cifs_oplock_break_ops;
 804
 805 #endif  /* _CIFS_GLOB_H */