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; /* for signing, protected by srv_mutex */
 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         u64  createtime;                /* creation time on server */
 457 #ifdef CONFIG_CIFS_FSCACHE
 458         struct fscache_cookie *fscache;
 459 #endif
 460         struct inode vfs_inode;
 461 };
 462
 463 static inline struct cifsInodeInfo *
 464 CIFS_I(struct inode *inode)
 465 {
 466         return container_of(inode, struct cifsInodeInfo, vfs_inode);
 467 }
 468
 469 static inline struct cifs_sb_info *
 470 CIFS_SB(struct super_block *sb)
 471 {
 472         return sb->s_fs_info;
 473 }
 474
 475 static inline char CIFS_DIR_SEP(const struct cifs_sb_info *cifs_sb)
 476 {
 477         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_POSIX_PATHS)
 478                 return '/';
 479         else
 480                 return '\\';
 481 }
 482
 483 #ifdef CONFIG_CIFS_STATS
 484 #define cifs_stats_inc atomic_inc
 485
 486 static inline void cifs_stats_bytes_written(struct cifsTconInfo *tcon,
 487                                             unsigned int bytes)
 488 {
 489         if (bytes) {
 490                 spin_lock(&tcon->stat_lock);
 491                 tcon->bytes_written += bytes;
 492                 spin_unlock(&tcon->stat_lock);
 493         }
 494 }
 495
 496 static inline void cifs_stats_bytes_read(struct cifsTconInfo *tcon,
 497                                          unsigned int bytes)
 498 {
 499         spin_lock(&tcon->stat_lock);
 500         tcon->bytes_read += bytes;
 501         spin_unlock(&tcon->stat_lock);
 502 }
 503 #else
 504
 505 #define  cifs_stats_inc(field) do {} while (0)
 506 #define  cifs_stats_bytes_written(tcon, bytes) do {} while (0)
 507 #define  cifs_stats_bytes_read(tcon, bytes) do {} while (0)
 508
 509 #endif
 510
 511 /* one of these for every pending CIFS request to the server */
 512 struct mid_q_entry {
 513         struct list_head qhead; /* mids waiting on reply from this server */
 514         __u16 mid;              /* multiplex id */
 515         __u16 pid;              /* process id */
 516         __u32 sequence_number;  /* for CIFS signing */
 517         unsigned long when_alloc;  /* when mid was created */
 518 #ifdef CONFIG_CIFS_STATS2
 519         unsigned long when_sent; /* time when smb send finished */
 520         unsigned long when_received; /* when demux complete (taken off wire) */
 521 #endif
 522         struct task_struct *tsk;        /* task waiting for response */
 523         struct smb_hdr *resp_buf;       /* response buffer */
 524         int midState;   /* wish this were enum but can not pass to wait_event */
 525         __u8 command;   /* smb command code */
 526         bool largeBuf:1;        /* if valid response, is pointer to large buf */
 527         bool multiRsp:1;        /* multiple trans2 responses for one request  */
 528         bool multiEnd:1;        /* both received */
 529 };
 530
 531 struct oplock_q_entry {
 532         struct list_head qhead;
 533         struct inode *pinode;
 534         struct cifsTconInfo *tcon;
 535         __u16 netfid;
 536 };
 537
 538 /* for pending dnotify requests */
 539 struct dir_notify_req {
 540         struct list_head lhead;
 541         __le16 Pid;
 542         __le16 PidHigh;
 543         __u16 Mid;
 544         __u16 Tid;
 545         __u16 Uid;
 546         __u16 netfid;
 547         __u32 filter; /* CompletionFilter (for multishot) */
 548         int multishot;
 549         struct file *pfile;
 550 };
 551
 552 struct dfs_info3_param {
 553         int flags; /* DFSREF_REFERRAL_SERVER, DFSREF_STORAGE_SERVER*/
 554         int path_consumed;
 555         int server_type;
 556         int ref_flag;
 557         char *path_name;
 558         char *node_name;
 559 };
 560
 561 /*
 562  * common struct for holding inode info when searching for or updating an
 563  * inode with new info
 564  */
 565
 566 #define CIFS_FATTR_DFS_REFERRAL         0x1
 567 #define CIFS_FATTR_DELETE_PENDING       0x2
 568 #define CIFS_FATTR_NEED_REVAL           0x4
 569 #define CIFS_FATTR_INO_COLLISION        0x8
 570
 571 struct cifs_fattr {
 572         u32             cf_flags;
 573         u32             cf_cifsattrs;
 574         u64             cf_uniqueid;
 575         u64             cf_eof;
 576         u64             cf_bytes;
 577         u64             cf_createtime;
 578         uid_t           cf_uid;
 579         gid_t           cf_gid;
 580         umode_t         cf_mode;
 581         dev_t           cf_rdev;
 582         unsigned int    cf_nlink;
 583         unsigned int    cf_dtype;
 584         struct timespec cf_atime;
 585         struct timespec cf_mtime;
 586         struct timespec cf_ctime;
 587 };
 588
 589 static inline void free_dfs_info_param(struct dfs_info3_param *param)
 590 {
 591         if (param) {
 592                 kfree(param->path_name);
 593                 kfree(param->node_name);
 594                 kfree(param);
 595         }
 596 }
 597
 598 static inline void free_dfs_info_array(struct dfs_info3_param *param,
 599                                        int number_of_items)
 600 {
 601         int i;
 602         if ((number_of_items == 0) || (param == NULL))
 603                 return;
 604         for (i = 0; i < number_of_items; i++) {
 605                 kfree(param[i].path_name);
 606                 kfree(param[i].node_name);
 607         }
 608         kfree(param);
 609 }
 610
 611 #define   MID_FREE 0
 612 #define   MID_REQUEST_ALLOCATED 1
 613 #define   MID_REQUEST_SUBMITTED 2
 614 #define   MID_RESPONSE_RECEIVED 4
 615 #define   MID_RETRY_NEEDED      8 /* session closed while this request out */
 616 #define   MID_NO_RESP_NEEDED 0x10
 617
 618 /* Types of response buffer returned from SendReceive2 */
 619 #define   CIFS_NO_BUFFER        0    /* Response buffer not returned */
 620 #define   CIFS_SMALL_BUFFER     1
 621 #define   CIFS_LARGE_BUFFER     2
 622 #define   CIFS_IOVEC            4    /* array of response buffers */
 623
 624 /* Type of Request to SendReceive2 */
 625 #define   CIFS_STD_OP           0    /* normal request timeout */
 626 #define   CIFS_LONG_OP          1    /* long op (up to 45 sec, oplock time) */
 627 #define   CIFS_VLONG_OP         2    /* sloow op - can take up to 180 seconds */
 628 #define   CIFS_BLOCKING_OP      4    /* operation can block */
 629 #define   CIFS_ASYNC_OP         8    /* do not wait for response */
 630 #define   CIFS_TIMEOUT_MASK 0x00F    /* only one of 5 above set in req */
 631 #define   CIFS_LOG_ERROR    0x010    /* log NT STATUS if non-zero */
 632 #define   CIFS_LARGE_BUF_OP 0x020    /* large request buffer */
 633 #define   CIFS_NO_RESP      0x040    /* no response buffer required */
 634
 635 /* Security Flags: indicate type of session setup needed */
 636 #define   CIFSSEC_MAY_SIGN      0x00001
 637 #define   CIFSSEC_MAY_NTLM      0x00002
 638 #define   CIFSSEC_MAY_NTLMV2    0x00004
 639 #define   CIFSSEC_MAY_KRB5      0x00008
 640 #ifdef CONFIG_CIFS_WEAK_PW_HASH
 641 #define   CIFSSEC_MAY_LANMAN    0x00010
 642 #define   CIFSSEC_MAY_PLNTXT    0x00020
 643 #else
 644 #define   CIFSSEC_MAY_LANMAN    0
 645 #define   CIFSSEC_MAY_PLNTXT    0
 646 #endif /* weak passwords */
 647 #define   CIFSSEC_MAY_SEAL      0x00040 /* not supported yet */
 648 #define   CIFSSEC_MAY_NTLMSSP   0x00080 /* raw ntlmssp with ntlmv2 */
 649
 650 #define   CIFSSEC_MUST_SIGN     0x01001
 651 /* note that only one of the following can be set so the
 652 result of setting MUST flags more than once will be to
 653 require use of the stronger protocol */
 654 #define   CIFSSEC_MUST_NTLM     0x02002
 655 #define   CIFSSEC_MUST_NTLMV2   0x04004
 656 #define   CIFSSEC_MUST_KRB5     0x08008
 657 #ifdef CONFIG_CIFS_WEAK_PW_HASH
 658 #define   CIFSSEC_MUST_LANMAN   0x10010
 659 #define   CIFSSEC_MUST_PLNTXT   0x20020
 660 #ifdef CONFIG_CIFS_UPCALL
 661 #define   CIFSSEC_MASK          0xBF0BF /* allows weak security but also krb5 */
 662 #else
 663 #define   CIFSSEC_MASK          0xB70B7 /* current flags supported if weak */
 664 #endif /* UPCALL */
 665 #else /* do not allow weak pw hash */
 666 #ifdef CONFIG_CIFS_UPCALL
 667 #define   CIFSSEC_MASK          0x8F08F /* flags supported if no weak allowed */
 668 #else
 669 #define   CIFSSEC_MASK          0x87087 /* flags supported if no weak allowed */
 670 #endif /* UPCALL */
 671 #endif /* WEAK_PW_HASH */
 672 #define   CIFSSEC_MUST_SEAL     0x40040 /* not supported yet */
 673 #define   CIFSSEC_MUST_NTLMSSP  0x80080 /* raw ntlmssp with ntlmv2 */
 674
 675 #define   CIFSSEC_DEF (CIFSSEC_MAY_SIGN | CIFSSEC_MAY_NTLM | CIFSSEC_MAY_NTLMV2)
 676 #define   CIFSSEC_MAX (CIFSSEC_MUST_SIGN | CIFSSEC_MUST_NTLMV2)
 677 #define   CIFSSEC_AUTH_MASK (CIFSSEC_MAY_NTLM | CIFSSEC_MAY_NTLMV2 | CIFSSEC_MAY_LANMAN | CIFSSEC_MAY_PLNTXT | CIFSSEC_MAY_KRB5 | CIFSSEC_MAY_NTLMSSP)
 678 /*
 679  *****************************************************************
 680  * All constants go here
 681  *****************************************************************
 682  */
 683
 684 #define UID_HASH (16)
 685
 686 /*
 687  * Note that ONE module should define _DECLARE_GLOBALS_HERE to cause the
 688  * following to be declared.
 689  */
 690
 691 /****************************************************************************
 692  *  Locking notes.  All updates to global variables and lists should be
 693  *                  protected by spinlocks or semaphores.
 694  *
 695  *  Spinlocks
 696  *  ---------
 697  *  GlobalMid_Lock protects:
 698  *      list operations on pending_mid_q and oplockQ
 699  *      updates to XID counters, multiplex id  and SMB sequence numbers
 700  *  cifs_file_list_lock protects:
 701  *      list operations on tcp and SMB session lists and tCon lists
 702  *  f_owner.lock protects certain per file struct operations
 703  *  mapping->page_lock protects certain per page operations
 704  *
 705  *  Semaphores
 706  *  ----------
 707  *  sesSem     operations on smb session
 708  *  tconSem    operations on tree connection
 709  *  fh_sem      file handle reconnection operations
 710  *
 711  ****************************************************************************/
 712
 713 #ifdef DECLARE_GLOBALS_HERE
 714 #define GLOBAL_EXTERN
 715 #else
 716 #define GLOBAL_EXTERN extern
 717 #endif
 718
 719 /*
 720  * the list of TCP_Server_Info structures, ie each of the sockets
 721  * connecting our client to a distinct server (ip address), is
 722  * chained together by cifs_tcp_ses_list. The list of all our SMB
 723  * sessions (and from that the tree connections) can be found
 724  * by iterating over cifs_tcp_ses_list
 725  */
 726 GLOBAL_EXTERN struct list_head          cifs_tcp_ses_list;
 727
 728 /*
 729  * This lock protects the cifs_tcp_ses_list, the list of smb sessions per
 730  * tcp session, and the list of tcon's per smb session. It also protects
 731  * the reference counters for the server, smb session, and tcon. Finally,
 732  * changes to the tcon->tidStatus should be done while holding this lock.
 733  */
 734 GLOBAL_EXTERN spinlock_t                cifs_tcp_ses_lock;
 735
 736 /*
 737  * This lock protects the cifs_file->llist and cifs_file->flist
 738  * list operations, and updates to some flags (cifs_file->invalidHandle)
 739  * It will be moved to either use the tcon->stat_lock or equivalent later.
 740  * If cifs_tcp_ses_lock and the lock below are both needed to be held, then
 741  * the cifs_tcp_ses_lock must be grabbed first and released last.
 742  */
 743 GLOBAL_EXTERN spinlock_t        cifs_file_list_lock;
 744
 745 /* Outstanding dir notify requests */
 746 GLOBAL_EXTERN struct list_head GlobalDnotifyReqList;
 747 /* DirNotify response queue */
 748 GLOBAL_EXTERN struct list_head GlobalDnotifyRsp_Q;
 749
 750 /*
 751  * Global transaction id (XID) information
 752  */
 753 GLOBAL_EXTERN unsigned int GlobalCurrentXid;    /* protected by GlobalMid_Sem */
 754 GLOBAL_EXTERN unsigned int GlobalTotalActiveXid; /* prot by GlobalMid_Sem */
 755 GLOBAL_EXTERN unsigned int GlobalMaxActiveXid;  /* prot by GlobalMid_Sem */
 756 GLOBAL_EXTERN spinlock_t GlobalMid_Lock;  /* protects above & list operations */
 757                                           /* on midQ entries */
 758 /*
 759  *  Global counters, updated atomically
 760  */
 761 GLOBAL_EXTERN atomic_t sesInfoAllocCount;
 762 GLOBAL_EXTERN atomic_t tconInfoAllocCount;
 763 GLOBAL_EXTERN atomic_t tcpSesAllocCount;
 764 GLOBAL_EXTERN atomic_t tcpSesReconnectCount;
 765 GLOBAL_EXTERN atomic_t tconInfoReconnectCount;
 766
 767 /* Various Debug counters */
 768 GLOBAL_EXTERN atomic_t bufAllocCount;    /* current number allocated  */
 769 #ifdef CONFIG_CIFS_STATS2
 770 GLOBAL_EXTERN atomic_t totBufAllocCount; /* total allocated over all time */
 771 GLOBAL_EXTERN atomic_t totSmBufAllocCount;
 772 #endif
 773 GLOBAL_EXTERN atomic_t smBufAllocCount;
 774 GLOBAL_EXTERN atomic_t midCount;
 775
 776 /* Misc globals */
 777 GLOBAL_EXTERN unsigned int multiuser_mount; /* if enabled allows new sessions
 778                                 to be established on existing mount if we
 779                                 have the uid/password or Kerberos credential
 780                                 or equivalent for current user */
 781 GLOBAL_EXTERN unsigned int oplockEnabled;
 782 GLOBAL_EXTERN unsigned int experimEnabled;
 783 GLOBAL_EXTERN unsigned int lookupCacheEnabled;
 784 GLOBAL_EXTERN unsigned int global_secflags;     /* if on, session setup sent
 785                                 with more secure ntlmssp2 challenge/resp */
 786 GLOBAL_EXTERN unsigned int sign_CIFS_PDUs;  /* enable smb packet signing */
 787 GLOBAL_EXTERN unsigned int linuxExtEnabled;/*enable Linux/Unix CIFS extensions*/
 788 GLOBAL_EXTERN unsigned int CIFSMaxBufSize;  /* max size not including hdr */
 789 GLOBAL_EXTERN unsigned int cifs_min_rcv;    /* min size of big ntwrk buf pool */
 790 GLOBAL_EXTERN unsigned int cifs_min_small;  /* min size of small buf pool */
 791 GLOBAL_EXTERN unsigned int cifs_max_pending; /* MAX requests at once to server*/
 792
 793 void cifs_oplock_break(struct work_struct *work);
 794 void cifs_oplock_break_get(struct cifsFileInfo *cfile);
 795 void cifs_oplock_break_put(struct cifsFileInfo *cfile);
 796
 797 extern const struct slow_work_ops cifs_oplock_break_ops;
 798
 799 #endif  /* _CIFS_GLOB_H */