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