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         char *hostname; /* hostname portion of UNC string */
 165         struct socket *ssocket;
 166         union {
 167                 struct sockaddr_in sockAddr;
 168                 struct sockaddr_in6 sockAddr6;
 169         } addr;
 170         struct sockaddr_storage srcaddr; /* locally bind to this IP */
 171         wait_queue_head_t response_q;
 172         wait_queue_head_t request_q; /* if more than maxmpx to srvr must block*/
 173         struct list_head pending_mid_q;
 174         void *Server_NlsInfo;   /* BB - placeholder for future NLS info  */
 175         unsigned short server_codepage; /* codepage for the server    */
 176         enum protocolEnum protocolType;
 177         char versionMajor;
 178         char versionMinor;
 179         bool svlocal:1;                 /* local server or remote */
 180         bool noblocksnd;                /* use blocking sendmsg */
 181         bool noautotune;                /* do not autotune send buf sizes */
 182         bool tcp_nodelay;
 183         atomic_t inFlight;  /* number of requests on the wire to server */
 184 #ifdef CONFIG_CIFS_STATS2
 185         atomic_t inSend; /* requests trying to send */
 186         atomic_t num_waiters;   /* blocked waiting to get in sendrecv */
 187 #endif
 188         enum statusEnum tcpStatus; /* what we think the status is */
 189         struct mutex srv_mutex;
 190         struct task_struct *tsk;
 191         char server_GUID[16];
 192         char secMode;
 193         enum securityEnum secType;
 194         unsigned int maxReq;    /* Clients should submit no more */
 195         /* than maxReq distinct unanswered SMBs to the server when using  */
 196         /* multiplexed reads or writes */
 197         unsigned int maxBuf;    /* maxBuf specifies the maximum */
 198         /* message size the server can send or receive for non-raw SMBs */
 199         unsigned int max_rw;    /* maxRw specifies the maximum */
 200         /* message size the server can send or receive for */
 201         /* SMB_COM_WRITE_RAW or SMB_COM_READ_RAW. */
 202         unsigned int max_vcs;   /* maximum number of smb sessions, at least
 203                                    those that can be specified uniquely with
 204                                    vcnumbers */
 205         char sessid[4];         /* unique token id for this session */
 206         /* (returned on Negotiate */
 207         int capabilities; /* allow selective disabling of caps by smb sess */
 208         int timeAdj;  /* Adjust for difference in server time zone in sec */
 209         __u16 CurrentMid;         /* multiplex id - rotating counter */
 210         char cryptkey[CIFS_CRYPTO_KEY_SIZE]; /* used by ntlm, ntlmv2 etc */
 211         /* 16th byte of RFC1001 workstation name is always null */
 212         char workstation_RFC1001_name[RFC1001_NAME_LEN_WITH_NULL];
 213         __u32 sequence_number; /* needed for CIFS PDU signature */
 214         struct session_key session_key;
 215         unsigned long lstrp; /* when we got last response from this server */
 216         u16 dialect; /* dialect index that server chose */
 217         struct cifs_secmech secmech; /* crypto sec mech functs, descriptors */
 218         /* extended security flavors that server supports */
 219         bool    sec_kerberos;           /* supports plain Kerberos */
 220         bool    sec_mskerberos;         /* supports legacy MS Kerberos */
 221         bool    sec_kerberosu2u;        /* supports U2U Kerberos */
 222         bool    sec_ntlmssp;            /* supports NTLMSSP */
 223         bool session_estab; /* mark when very first sess is established */
 224 #ifdef CONFIG_CIFS_FSCACHE
 225         struct fscache_cookie   *fscache; /* client index cache cookie */
 226 #endif
 227 };
 228
 229 /*
 230  * Session structure.  One of these for each uid session with a particular host
 231  */
 232 struct cifsSesInfo {
 233         struct list_head smb_ses_list;
 234         struct list_head tcon_list;
 235         struct mutex session_mutex;
 236         struct TCP_Server_Info *server; /* pointer to server info */
 237         int ses_count;          /* reference counter */
 238         enum statusEnum status;
 239         unsigned overrideSecFlg;  /* if non-zero override global sec flags */
 240         __u16 ipc_tid;          /* special tid for connection to IPC share */
 241         __u16 flags;
 242         __u16 vcnum;
 243         char *serverOS;         /* name of operating system underlying server */
 244         char *serverNOS;        /* name of network operating system of server */
 245         char *serverDomain;     /* security realm of server */
 246         int Suid;               /* remote smb uid  */
 247         uid_t linux_uid;        /* overriding owner of files on the mount */
 248         uid_t cred_uid;         /* owner of credentials */
 249         int capabilities;
 250         char serverName[SERVER_NAME_LEN_WITH_NULL * 2]; /* BB make bigger for
 251                                 TCP names - will ipv6 and sctp addresses fit? */
 252         char userName[MAX_USERNAME_SIZE + 1];
 253         char *domainName;
 254         char *password;
 255         struct session_key auth_key;
 256         struct ntlmssp_auth *ntlmssp; /* ciphertext, flags, server challenge */
 257         bool need_reconnect:1; /* connection reset, uid now invalid */
 258 };
 259 /* no more than one of the following three session flags may be set */
 260 #define CIFS_SES_NT4 1
 261 #define CIFS_SES_OS2 2
 262 #define CIFS_SES_W9X 4
 263 /* following flag is set for old servers such as OS2 (and Win95?)
 264    which do not negotiate NTLM or POSIX dialects, but instead
 265    negotiate one of the older LANMAN dialects */
 266 #define CIFS_SES_LANMAN 8
 267 /*
 268  * there is one of these for each connection to a resource on a particular
 269  * session
 270  */
 271 struct cifsTconInfo {
 272         struct list_head tcon_list;
 273         int tc_count;
 274         struct list_head openFileList;
 275         struct cifsSesInfo *ses;        /* pointer to session associated with */
 276         char treeName[MAX_TREE_SIZE + 1]; /* UNC name of resource in ASCII */
 277         char *nativeFileSystem;
 278         char *password;         /* for share-level security */
 279         __u16 tid;              /* The 2 byte tree id */
 280         __u16 Flags;            /* optional support bits */
 281         enum statusEnum tidStatus;
 282 #ifdef CONFIG_CIFS_STATS
 283         atomic_t num_smbs_sent;
 284         atomic_t num_writes;
 285         atomic_t num_reads;
 286         atomic_t num_flushes;
 287         atomic_t num_oplock_brks;
 288         atomic_t num_opens;
 289         atomic_t num_closes;
 290         atomic_t num_deletes;
 291         atomic_t num_mkdirs;
 292         atomic_t num_posixopens;
 293         atomic_t num_posixmkdirs;
 294         atomic_t num_rmdirs;
 295         atomic_t num_renames;
 296         atomic_t num_t2renames;
 297         atomic_t num_ffirst;
 298         atomic_t num_fnext;
 299         atomic_t num_fclose;
 300         atomic_t num_hardlinks;
 301         atomic_t num_symlinks;
 302         atomic_t num_locks;
 303         atomic_t num_acl_get;
 304         atomic_t num_acl_set;
 305 #ifdef CONFIG_CIFS_STATS2
 306         unsigned long long time_writes;
 307         unsigned long long time_reads;
 308         unsigned long long time_opens;
 309         unsigned long long time_deletes;
 310         unsigned long long time_closes;
 311         unsigned long long time_mkdirs;
 312         unsigned long long time_rmdirs;
 313         unsigned long long time_renames;
 314         unsigned long long time_t2renames;
 315         unsigned long long time_ffirst;
 316         unsigned long long time_fnext;
 317         unsigned long long time_fclose;
 318 #endif /* CONFIG_CIFS_STATS2 */
 319         __u64    bytes_read;
 320         __u64    bytes_written;
 321         spinlock_t stat_lock;
 322 #endif /* CONFIG_CIFS_STATS */
 323         FILE_SYSTEM_DEVICE_INFO fsDevInfo;
 324         FILE_SYSTEM_ATTRIBUTE_INFO fsAttrInfo; /* ok if fs name truncated */
 325         FILE_SYSTEM_UNIX_INFO fsUnixInfo;
 326         bool ipc:1;             /* set if connection to IPC$ eg for RPC/PIPES */
 327         bool retry:1;
 328         bool nocase:1;
 329         bool seal:1;      /* transport encryption for this mounted share */
 330         bool unix_ext:1;  /* if false disable Linux extensions to CIFS protocol
 331                                 for this mount even if server would support */
 332         bool local_lease:1; /* check leases (only) on local system not remote */
 333         bool broken_posix_open; /* e.g. Samba server versions < 3.3.2, 3.2.9 */
 334         bool need_reconnect:1; /* connection reset, tid now invalid */
 335 #ifdef CONFIG_CIFS_FSCACHE
 336         u64 resource_id;                /* server resource id */
 337         struct fscache_cookie *fscache; /* cookie for share */
 338 #endif
 339         /* BB add field for back pointer to sb struct(s)? */
 340 };
 341
 342 /*
 343  * This is a refcounted and timestamped container for a tcon pointer. The
 344  * container holds a tcon reference. It is considered safe to free one of
 345  * these when the tl_count goes to 0. The tl_time is the time of the last
 346  * "get" on the container.
 347  */
 348 struct tcon_link {
 349         struct rb_node          tl_rbnode;
 350         uid_t                   tl_uid;
 351         unsigned long           tl_flags;
 352 #define TCON_LINK_MASTER        0
 353 #define TCON_LINK_PENDING       1
 354 #define TCON_LINK_IN_TREE       2
 355         unsigned long           tl_time;
 356         atomic_t                tl_count;
 357         struct cifsTconInfo     *tl_tcon;
 358 };
 359
 360 extern struct tcon_link *cifs_sb_tlink(struct cifs_sb_info *cifs_sb);
 361
 362 static inline struct cifsTconInfo *
 363 tlink_tcon(struct tcon_link *tlink)
 364 {
 365         return tlink->tl_tcon;
 366 }
 367
 368 extern void cifs_put_tlink(struct tcon_link *tlink);
 369
 370 static inline struct tcon_link *
 371 cifs_get_tlink(struct tcon_link *tlink)
 372 {
 373         if (tlink && !IS_ERR(tlink))
 374                 atomic_inc(&tlink->tl_count);
 375         return tlink;
 376 }
 377
 378 /* This function is always expected to succeed */
 379 extern struct cifsTconInfo *cifs_sb_master_tcon(struct cifs_sb_info *cifs_sb);
 380
 381 /*
 382  * This info hangs off the cifsFileInfo structure, pointed to by llist.
 383  * This is used to track byte stream locks on the file
 384  */
 385 struct cifsLockInfo {
 386         struct list_head llist; /* pointer to next cifsLockInfo */
 387         __u64 offset;
 388         __u64 length;
 389         __u8 type;
 390 };
 391
 392 /*
 393  * One of these for each open instance of a file
 394  */
 395 struct cifs_search_info {
 396         loff_t index_of_last_entry;
 397         __u16 entries_in_buffer;
 398         __u16 info_level;
 399         __u32 resume_key;
 400         char *ntwrk_buf_start;
 401         char *srch_entries_start;
 402         char *last_entry;
 403         char *presume_name;
 404         unsigned int resume_name_len;
 405         bool endOfSearch:1;
 406         bool emptyDir:1;
 407         bool unicode:1;
 408         bool smallBuf:1; /* so we know which buf_release function to call */
 409 };
 410
 411 struct cifsFileInfo {
 412         struct list_head tlist; /* pointer to next fid owned by tcon */
 413         struct list_head flist; /* next fid (file instance) for this inode */
 414         unsigned int uid;       /* allows finding which FileInfo structure */
 415         __u32 pid;              /* process id who opened file */
 416         __u16 netfid;           /* file id from remote */
 417         /* BB add lock scope info here if needed */ ;
 418         /* lock scope id (0 if none) */
 419         struct dentry *dentry;
 420         unsigned int f_flags;
 421         struct tcon_link *tlink;
 422         struct mutex lock_mutex;
 423         struct list_head llist; /* list of byte range locks we have. */
 424         bool invalidHandle:1;   /* file closed via session abend */
 425         bool oplock_break_cancelled:1;
 426         int count;              /* refcount protected by cifs_file_list_lock */
 427         struct mutex fh_mutex; /* prevents reopen race after dead ses*/
 428         struct cifs_search_info srch_inf;
 429         struct work_struct oplock_break; /* work for oplock breaks */
 430 };
 431
 432 /*
 433  * Take a reference on the file private data. Must be called with
 434  * cifs_file_list_lock held.
 435  */
 436 static inline void cifsFileInfo_get(struct cifsFileInfo *cifs_file)
 437 {
 438         ++cifs_file->count;
 439 }
 440
 441 void cifsFileInfo_put(struct cifsFileInfo *cifs_file);
 442
 443 /*
 444  * One of these for each file inode
 445  */
 446
 447 struct cifsInodeInfo {
 448         struct list_head lockList;
 449         /* BB add in lists for dirty pages i.e. write caching info for oplock */
 450         struct list_head openFileList;
 451         __u32 cifsAttrs; /* e.g. DOS archive bit, sparse, compressed, system */
 452         unsigned long time;     /* jiffies of last update/check of inode */
 453         bool clientCanCacheRead:1;      /* read oplock */
 454         bool clientCanCacheAll:1;       /* read and writebehind oplock */
 455         bool delete_pending:1;          /* DELETE_ON_CLOSE is set */
 456         bool invalid_mapping:1;         /* pagecache is invalid */
 457         u64  server_eof;                /* current file size on server */
 458         u64  uniqueid;                  /* server inode number */
 459 #ifdef CONFIG_CIFS_FSCACHE
 460         struct fscache_cookie *fscache;
 461 #endif
 462         struct inode vfs_inode;
 463 };
 464
 465 static inline struct cifsInodeInfo *
 466 CIFS_I(struct inode *inode)
 467 {
 468         return container_of(inode, struct cifsInodeInfo, vfs_inode);
 469 }
 470
 471 static inline struct cifs_sb_info *
 472 CIFS_SB(struct super_block *sb)
 473 {
 474         return sb->s_fs_info;
 475 }
 476
 477 static inline char CIFS_DIR_SEP(const struct cifs_sb_info *cifs_sb)
 478 {
 479         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_POSIX_PATHS)
 480                 return '/';
 481         else
 482                 return '\\';
 483 }
 484
 485 #ifdef CONFIG_CIFS_STATS
 486 #define cifs_stats_inc atomic_inc
 487
 488 static inline void cifs_stats_bytes_written(struct cifsTconInfo *tcon,
 489                                             unsigned int bytes)
 490 {
 491         if (bytes) {
 492                 spin_lock(&tcon->stat_lock);
 493                 tcon->bytes_written += bytes;
 494                 spin_unlock(&tcon->stat_lock);
 495         }
 496 }
 497
 498 static inline void cifs_stats_bytes_read(struct cifsTconInfo *tcon,
 499                                          unsigned int bytes)
 500 {
 501         spin_lock(&tcon->stat_lock);
 502         tcon->bytes_read += bytes;
 503         spin_unlock(&tcon->stat_lock);
 504 }
 505 #else
 506
 507 #define  cifs_stats_inc(field) do {} while (0)
 508 #define  cifs_stats_bytes_written(tcon, bytes) do {} while (0)
 509 #define  cifs_stats_bytes_read(tcon, bytes) do {} while (0)
 510
 511 #endif
 512
 513 /* one of these for every pending CIFS request to the server */
 514 struct mid_q_entry {
 515         struct list_head qhead; /* mids waiting on reply from this server */
 516         __u16 mid;              /* multiplex id */
 517         __u16 pid;              /* process id */
 518         __u32 sequence_number;  /* for CIFS signing */
 519         unsigned long when_alloc;  /* when mid was created */
 520 #ifdef CONFIG_CIFS_STATS2
 521         unsigned long when_sent; /* time when smb send finished */
 522         unsigned long when_received; /* when demux complete (taken off wire) */
 523 #endif
 524         struct task_struct *tsk;        /* task waiting for response */
 525         struct smb_hdr *resp_buf;       /* response buffer */
 526         int midState;   /* wish this were enum but can not pass to wait_event */
 527         __u8 command;   /* smb command code */
 528         bool largeBuf:1;        /* if valid response, is pointer to large buf */
 529         bool multiRsp:1;        /* multiple trans2 responses for one request  */
 530         bool multiEnd:1;        /* both received */
 531 };
 532
 533 struct oplock_q_entry {
 534         struct list_head qhead;
 535         struct inode *pinode;
 536         struct cifsTconInfo *tcon;
 537         __u16 netfid;
 538 };
 539
 540 /* for pending dnotify requests */
 541 struct dir_notify_req {
 542         struct list_head lhead;
 543         __le16 Pid;
 544         __le16 PidHigh;
 545         __u16 Mid;
 546         __u16 Tid;
 547         __u16 Uid;
 548         __u16 netfid;
 549         __u32 filter; /* CompletionFilter (for multishot) */
 550         int multishot;
 551         struct file *pfile;
 552 };
 553
 554 struct dfs_info3_param {
 555         int flags; /* DFSREF_REFERRAL_SERVER, DFSREF_STORAGE_SERVER*/
 556         int path_consumed;
 557         int server_type;
 558         int ref_flag;
 559         char *path_name;
 560         char *node_name;
 561 };
 562
 563 /*
 564  * common struct for holding inode info when searching for or updating an
 565  * inode with new info
 566  */
 567
 568 #define CIFS_FATTR_DFS_REFERRAL         0x1
 569 #define CIFS_FATTR_DELETE_PENDING       0x2
 570 #define CIFS_FATTR_NEED_REVAL           0x4
 571 #define CIFS_FATTR_INO_COLLISION        0x8
 572
 573 struct cifs_fattr {
 574         u32             cf_flags;
 575         u32             cf_cifsattrs;
 576         u64             cf_uniqueid;
 577         u64             cf_eof;
 578         u64             cf_bytes;
 579         uid_t           cf_uid;
 580         gid_t           cf_gid;
 581         umode_t         cf_mode;
 582         dev_t           cf_rdev;
 583         unsigned int    cf_nlink;
 584         unsigned int    cf_dtype;
 585         struct timespec cf_atime;
 586         struct timespec cf_mtime;
 587         struct timespec cf_ctime;
 588 };
 589
 590 static inline void free_dfs_info_param(struct dfs_info3_param *param)
 591 {
 592         if (param) {
 593                 kfree(param->path_name);
 594                 kfree(param->node_name);
 595                 kfree(param);
 596         }
 597 }
 598
 599 static inline void free_dfs_info_array(struct dfs_info3_param *param,
 600                                        int number_of_items)
 601 {
 602         int i;
 603         if ((number_of_items == 0) || (param == NULL))
 604                 return;
 605         for (i = 0; i < number_of_items; i++) {
 606                 kfree(param[i].path_name);
 607                 kfree(param[i].node_name);
 608         }
 609         kfree(param);
 610 }
 611
 612 #define   MID_FREE 0
 613 #define   MID_REQUEST_ALLOCATED 1
 614 #define   MID_REQUEST_SUBMITTED 2
 615 #define   MID_RESPONSE_RECEIVED 4
 616 #define   MID_RETRY_NEEDED      8 /* session closed while this request out */
 617 #define   MID_NO_RESP_NEEDED 0x10
 618
 619 /* Types of response buffer returned from SendReceive2 */
 620 #define   CIFS_NO_BUFFER        0    /* Response buffer not returned */
 621 #define   CIFS_SMALL_BUFFER     1
 622 #define   CIFS_LARGE_BUFFER     2
 623 #define   CIFS_IOVEC            4    /* array of response buffers */
 624
 625 /* Type of Request to SendReceive2 */
 626 #define   CIFS_STD_OP           0    /* normal request timeout */
 627 #define   CIFS_LONG_OP          1    /* long op (up to 45 sec, oplock time) */
 628 #define   CIFS_VLONG_OP         2    /* sloow op - can take up to 180 seconds */
 629 #define   CIFS_BLOCKING_OP      4    /* operation can block */
 630 #define   CIFS_ASYNC_OP         8    /* do not wait for response */
 631 #define   CIFS_TIMEOUT_MASK 0x00F    /* only one of 5 above set in req */
 632 #define   CIFS_LOG_ERROR    0x010    /* log NT STATUS if non-zero */
 633 #define   CIFS_LARGE_BUF_OP 0x020    /* large request buffer */
 634 #define   CIFS_NO_RESP      0x040    /* no response buffer required */
 635
 636 /* Security Flags: indicate type of session setup needed */
 637 #define   CIFSSEC_MAY_SIGN      0x00001
 638 #define   CIFSSEC_MAY_NTLM      0x00002
 639 #define   CIFSSEC_MAY_NTLMV2    0x00004
 640 #define   CIFSSEC_MAY_KRB5      0x00008
 641 #ifdef CONFIG_CIFS_WEAK_PW_HASH
 642 #define   CIFSSEC_MAY_LANMAN    0x00010
 643 #define   CIFSSEC_MAY_PLNTXT    0x00020
 644 #else
 645 #define   CIFSSEC_MAY_LANMAN    0
 646 #define   CIFSSEC_MAY_PLNTXT    0
 647 #endif /* weak passwords */
 648 #define   CIFSSEC_MAY_SEAL      0x00040 /* not supported yet */
 649 #define   CIFSSEC_MAY_NTLMSSP   0x00080 /* raw ntlmssp with ntlmv2 */
 650
 651 #define   CIFSSEC_MUST_SIGN     0x01001
 652 /* note that only one of the following can be set so the
 653 result of setting MUST flags more than once will be to
 654 require use of the stronger protocol */
 655 #define   CIFSSEC_MUST_NTLM     0x02002
 656 #define   CIFSSEC_MUST_NTLMV2   0x04004
 657 #define   CIFSSEC_MUST_KRB5     0x08008
 658 #ifdef CONFIG_CIFS_WEAK_PW_HASH
 659 #define   CIFSSEC_MUST_LANMAN   0x10010
 660 #define   CIFSSEC_MUST_PLNTXT   0x20020
 661 #ifdef CONFIG_CIFS_UPCALL
 662 #define   CIFSSEC_MASK          0xBF0BF /* allows weak security but also krb5 */
 663 #else
 664 #define   CIFSSEC_MASK          0xB70B7 /* current flags supported if weak */
 665 #endif /* UPCALL */
 666 #else /* do not allow weak pw hash */
 667 #ifdef CONFIG_CIFS_UPCALL
 668 #define   CIFSSEC_MASK          0x8F08F /* flags supported if no weak allowed */
 669 #else
 670 #define   CIFSSEC_MASK          0x87087 /* flags supported if no weak allowed */
 671 #endif /* UPCALL */
 672 #endif /* WEAK_PW_HASH */
 673 #define   CIFSSEC_MUST_SEAL     0x40040 /* not supported yet */
 674 #define   CIFSSEC_MUST_NTLMSSP  0x80080 /* raw ntlmssp with ntlmv2 */
 675
 676 #define   CIFSSEC_DEF (CIFSSEC_MAY_SIGN | CIFSSEC_MAY_NTLM | CIFSSEC_MAY_NTLMV2)
 677 #define   CIFSSEC_MAX (CIFSSEC_MUST_SIGN | CIFSSEC_MUST_NTLMV2)
 678 #define   CIFSSEC_AUTH_MASK (CIFSSEC_MAY_NTLM | CIFSSEC_MAY_NTLMV2 | CIFSSEC_MAY_LANMAN | CIFSSEC_MAY_PLNTXT | CIFSSEC_MAY_KRB5 | CIFSSEC_MAY_NTLMSSP)
 679 /*
 680  *****************************************************************
 681  * All constants go here
 682  *****************************************************************
 683  */
 684
 685 #define UID_HASH (16)
 686
 687 /*
 688  * Note that ONE module should define _DECLARE_GLOBALS_HERE to cause the
 689  * following to be declared.
 690  */
 691
 692 /****************************************************************************
 693  *  Locking notes.  All updates to global variables and lists should be
 694  *                  protected by spinlocks or semaphores.
 695  *
 696  *  Spinlocks
 697  *  ---------
 698  *  GlobalMid_Lock protects:
 699  *      list operations on pending_mid_q and oplockQ
 700  *      updates to XID counters, multiplex id  and SMB sequence numbers
 701  *  cifs_file_list_lock protects:
 702  *      list operations on tcp and SMB session lists and tCon lists
 703  *  f_owner.lock protects certain per file struct operations
 704  *  mapping->page_lock protects certain per page operations
 705  *
 706  *  Semaphores
 707  *  ----------
 708  *  sesSem     operations on smb session
 709  *  tconSem    operations on tree connection
 710  *  fh_sem      file handle reconnection operations
 711  *
 712  ****************************************************************************/
 713
 714 #ifdef DECLARE_GLOBALS_HERE
 715 #define GLOBAL_EXTERN
 716 #else
 717 #define GLOBAL_EXTERN extern
 718 #endif
 719
 720 /*
 721  * the list of TCP_Server_Info structures, ie each of the sockets
 722  * connecting our client to a distinct server (ip address), is
 723  * chained together by cifs_tcp_ses_list. The list of all our SMB
 724  * sessions (and from that the tree connections) can be found
 725  * by iterating over cifs_tcp_ses_list
 726  */
 727 GLOBAL_EXTERN struct list_head          cifs_tcp_ses_list;
 728
 729 /*
 730  * This lock protects the cifs_tcp_ses_list, the list of smb sessions per
 731  * tcp session, and the list of tcon's per smb session. It also protects
 732  * the reference counters for the server, smb session, and tcon. Finally,
 733  * changes to the tcon->tidStatus should be done while holding this lock.
 734  */
 735 GLOBAL_EXTERN spinlock_t                cifs_tcp_ses_lock;
 736
 737 /*
 738  * This lock protects the cifs_file->llist and cifs_file->flist
 739  * list operations, and updates to some flags (cifs_file->invalidHandle)
 740  * It will be moved to either use the tcon->stat_lock or equivalent later.
 741  * If cifs_tcp_ses_lock and the lock below are both needed to be held, then
 742  * the cifs_tcp_ses_lock must be grabbed first and released last.
 743  */
 744 GLOBAL_EXTERN spinlock_t        cifs_file_list_lock;
 745
 746 /* Outstanding dir notify requests */
 747 GLOBAL_EXTERN struct list_head GlobalDnotifyReqList;
 748 /* DirNotify response queue */
 749 GLOBAL_EXTERN struct list_head GlobalDnotifyRsp_Q;
 750
 751 /*
 752  * Global transaction id (XID) information
 753  */
 754 GLOBAL_EXTERN unsigned int GlobalCurrentXid;    /* protected by GlobalMid_Sem */
 755 GLOBAL_EXTERN unsigned int GlobalTotalActiveXid; /* prot by GlobalMid_Sem */
 756 GLOBAL_EXTERN unsigned int GlobalMaxActiveXid;  /* prot by GlobalMid_Sem */
 757 GLOBAL_EXTERN spinlock_t GlobalMid_Lock;  /* protects above & list operations */
 758                                           /* on midQ entries */
 759 /*
 760  *  Global counters, updated atomically
 761  */
 762 GLOBAL_EXTERN atomic_t sesInfoAllocCount;
 763 GLOBAL_EXTERN atomic_t tconInfoAllocCount;
 764 GLOBAL_EXTERN atomic_t tcpSesAllocCount;
 765 GLOBAL_EXTERN atomic_t tcpSesReconnectCount;
 766 GLOBAL_EXTERN atomic_t tconInfoReconnectCount;
 767
 768 /* Various Debug counters */
 769 GLOBAL_EXTERN atomic_t bufAllocCount;    /* current number allocated  */
 770 #ifdef CONFIG_CIFS_STATS2
 771 GLOBAL_EXTERN atomic_t totBufAllocCount; /* total allocated over all time */
 772 GLOBAL_EXTERN atomic_t totSmBufAllocCount;
 773 #endif
 774 GLOBAL_EXTERN atomic_t smBufAllocCount;
 775 GLOBAL_EXTERN atomic_t midCount;
 776
 777 /* Misc globals */
 778 GLOBAL_EXTERN unsigned int multiuser_mount; /* if enabled allows new sessions
 779                                 to be established on existing mount if we
 780                                 have the uid/password or Kerberos credential
 781                                 or equivalent for current user */
 782 GLOBAL_EXTERN unsigned int oplockEnabled;
 783 GLOBAL_EXTERN unsigned int experimEnabled;
 784 GLOBAL_EXTERN unsigned int lookupCacheEnabled;
 785 GLOBAL_EXTERN unsigned int global_secflags;     /* if on, session setup sent
 786                                 with more secure ntlmssp2 challenge/resp */
 787 GLOBAL_EXTERN unsigned int sign_CIFS_PDUs;  /* enable smb packet signing */
 788 GLOBAL_EXTERN unsigned int linuxExtEnabled;/*enable Linux/Unix CIFS extensions*/
 789 GLOBAL_EXTERN unsigned int CIFSMaxBufSize;  /* max size not including hdr */
 790 GLOBAL_EXTERN unsigned int cifs_min_rcv;    /* min size of big ntwrk buf pool */
 791 GLOBAL_EXTERN unsigned int cifs_min_small;  /* min size of small buf pool */
 792 GLOBAL_EXTERN unsigned int cifs_max_pending; /* MAX requests at once to server*/
 793
 794 void cifs_oplock_break(struct work_struct *work);
 795 void cifs_oplock_break_get(struct cifsFileInfo *cfile);
 796 void cifs_oplock_break_put(struct cifsFileInfo *cfile);
 797
 798 extern const struct slow_work_ops cifs_oplock_break_ops;
 799
 800 #endif  /* _CIFS_GLOB_H */