fs/cifs/cifsglob.h

   1 /*
   2  *   fs/cifs/cifsglob.h
   3  *
   4  *   Copyright (C) International Business Machines  Corp., 2002,2008
   5  *   Author(s): Steve French (sfrench@us.ibm.com)
   6  *              Jeremy Allison (jra@samba.org)
   7  *
   8  *   This library is free software; you can redistribute it and/or modify
   9  *   it under the terms of the GNU Lesser General Public License as published
  10  *   by the Free Software Foundation; either version 2.1 of the License, or
  11  *   (at your option) any later version.
  12  *
  13  *   This library is distributed in the hope that it will be useful,
  14  *   but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See
  16  *   the GNU Lesser General Public License for more details.
  17  *
  18  */
  19 #ifndef _CIFS_GLOB_H
  20 #define _CIFS_GLOB_H
  21
  22 #include <linux/in.h>
  23 #include <linux/in6.h>
  24 #include <linux/slab.h>
  25 #include <linux/workqueue.h>
  26 #include "cifs_fs_sb.h"
  27 #include "cifsacl.h"
  28 #include <crypto/internal/hash.h>
  29 #include <linux/scatterlist.h>
  30
  31 /*
  32  * The sizes of various internal tables and strings
  33  */
  34 #define MAX_UID_INFO 16
  35 #define MAX_SES_INFO 2
  36 #define MAX_TCON_INFO 4
  37
  38 #define MAX_TREE_SIZE (2 + MAX_SERVER_SIZE + 1 + MAX_SHARE_SIZE + 1)
  39 #define MAX_SERVER_SIZE 15
  40 #define MAX_SHARE_SIZE  64      /* used to be 20, this should still be enough */
  41 #define MAX_USERNAME_SIZE 32    /* 32 is to allow for 15 char names + null
  42                                    termination then *2 for unicode versions */
  43 #define MAX_PASSWORD_SIZE 512  /* max for windows seems to be 256 wide chars */
  44
  45 #define CIFS_MIN_RCV_POOL 4
  46
  47 /*
  48  * default attribute cache timeout (jiffies)
  49  */
  50 #define CIFS_DEF_ACTIMEO (1 * HZ)
  51
  52 /*
  53  * max attribute cache timeout (jiffies) - 2^30
  54  */
  55 #define CIFS_MAX_ACTIMEO (1 << 30)
  56
  57 /*
  58  * MAX_REQ is the maximum number of requests that WE will send
  59  * on one socket concurrently. It also matches the most common
  60  * value of max multiplex returned by servers.  We may
  61  * eventually want to use the negotiated value (in case
  62  * future servers can handle more) when we are more confident that
  63  * we will not have problems oveloading the socket with pending
  64  * write data.
  65  */
  66 #define CIFS_MAX_REQ 50
  67
  68 #define RFC1001_NAME_LEN 15
  69 #define RFC1001_NAME_LEN_WITH_NULL (RFC1001_NAME_LEN + 1)
  70
  71 /* currently length of NIP6_FMT */
  72 #define SERVER_NAME_LENGTH 40
  73 #define SERVER_NAME_LEN_WITH_NULL     (SERVER_NAME_LENGTH + 1)
  74
  75 /* used to define string lengths for reversing unicode strings */
  76 /*         (256+1)*2 = 514                                     */
  77 /*           (max path length + 1 for null) * 2 for unicode    */
  78 #define MAX_NAME 514
  79
  80 #include "cifspdu.h"
  81
  82 #ifndef XATTR_DOS_ATTRIB
  83 #define XATTR_DOS_ATTRIB "user.DOSATTRIB"
  84 #endif
  85
  86 /*
  87  * CIFS vfs client Status information (based on what we know.)
  88  */
  89
  90 /* associated with each tcp and smb session */
  91 enum statusEnum {
  92         CifsNew = 0,
  93         CifsGood,
  94         CifsExiting,
  95         CifsNeedReconnect
  96 };
  97
  98 enum securityEnum {
  99         LANMAN = 0,                     /* Legacy LANMAN auth */
 100         NTLM,                   /* Legacy NTLM012 auth with NTLM hash */
 101         NTLMv2,                 /* Legacy NTLM auth with NTLMv2 hash */
 102         RawNTLMSSP,             /* NTLMSSP without SPNEGO, NTLMv2 hash */
 103 /*      NTLMSSP, */ /* can use rawNTLMSSP instead of NTLMSSP via SPNEGO */
 104         Kerberos,               /* Kerberos via SPNEGO */
 105 };
 106
 107 enum protocolEnum {
 108         TCP = 0,
 109         SCTP
 110         /* Netbios frames protocol not supported at this time */
 111 };
 112
 113 struct session_key {
 114         unsigned int len;
 115         char *response;
 116 };
 117
 118 /* crypto security descriptor definition */
 119 struct sdesc {
 120         struct shash_desc shash;
 121         char ctx[];
 122 };
 123
 124 /* crypto hashing related structure/fields, not specific to a sec mech */
 125 struct cifs_secmech {
 126         struct crypto_shash *hmacmd5; /* hmac-md5 hash function */
 127         struct crypto_shash *md5; /* md5 hash function */
 128         struct sdesc *sdeschmacmd5;  /* ctxt to generate ntlmv2 hash, CR1 */
 129         struct sdesc *sdescmd5; /* ctxt to generate cifs/smb signature */
 130 };
 131
 132 /* per smb session structure/fields */
 133 struct ntlmssp_auth {
 134         __u32 client_flags; /* sent by client in type 1 ntlmsssp exchange */
 135         __u32 server_flags; /* sent by server in type 2 ntlmssp exchange */
 136         unsigned char ciphertext[CIFS_CPHTXT_SIZE]; /* sent to server */
 137         char cryptkey[CIFS_CRYPTO_KEY_SIZE]; /* used by ntlmssp */
 138 };
 139
 140 struct cifs_cred {
 141         int uid;
 142         int gid;
 143         int mode;
 144         int cecount;
 145         struct cifs_sid osid;
 146         struct cifs_sid gsid;
 147         struct cifs_ntace *ntaces;
 148         struct cifs_ace *aces;
 149 };
 150
 151 /*
 152  *****************************************************************
 153  * Except the CIFS PDUs themselves all the
 154  * globally interesting structs should go here
 155  *****************************************************************
 156  */
 157
 158 struct TCP_Server_Info {
 159         struct list_head tcp_ses_list;
 160         struct list_head smb_ses_list;
 161         int srv_count; /* reference counter */
 162         /* 15 character server name + 0x20 16th byte indicating type = srv */
 163         char server_RFC1001_name[RFC1001_NAME_LEN_WITH_NULL];
 164         enum statusEnum tcpStatus; /* what we think the status is */
 165         char *hostname; /* hostname portion of UNC string */
 166         struct socket *ssocket;
 167         struct sockaddr_storage dstaddr;
 168         struct sockaddr_storage srcaddr; /* locally bind to this IP */
 169 #ifdef CONFIG_NET_NS
 170         struct net *net;
 171 #endif
 172         wait_queue_head_t response_q;
 173         wait_queue_head_t request_q; /* if more than maxmpx to srvr must block*/
 174         struct list_head pending_mid_q;
 175         bool noblocksnd;                /* use blocking sendmsg */
 176         bool noautotune;                /* do not autotune send buf sizes */
 177         bool tcp_nodelay;
 178         atomic_t inFlight;  /* number of requests on the wire to server */
 179         struct mutex srv_mutex;
 180         struct task_struct *tsk;
 181         char server_GUID[16];
 182         char secMode;
 183         bool session_estab; /* mark when very first sess is established */
 184         u16 dialect; /* dialect index that server chose */
 185         enum securityEnum secType;
 186         unsigned int maxReq;    /* Clients should submit no more */
 187         /* than maxReq distinct unanswered SMBs to the server when using  */
 188         /* multiplexed reads or writes */
 189         unsigned int maxBuf;    /* maxBuf specifies the maximum */
 190         /* message size the server can send or receive for non-raw SMBs */
 191         unsigned int max_rw;    /* maxRw specifies the maximum */
 192         /* message size the server can send or receive for */
 193         /* SMB_COM_WRITE_RAW or SMB_COM_READ_RAW. */
 194         unsigned int max_vcs;   /* maximum number of smb sessions, at least
 195                                    those that can be specified uniquely with
 196                                    vcnumbers */
 197         int capabilities; /* allow selective disabling of caps by smb sess */
 198         int timeAdj;  /* Adjust for difference in server time zone in sec */
 199         __u16 CurrentMid;         /* multiplex id - rotating counter */
 200         char cryptkey[CIFS_CRYPTO_KEY_SIZE]; /* used by ntlm, ntlmv2 etc */
 201         /* 16th byte of RFC1001 workstation name is always null */
 202         char workstation_RFC1001_name[RFC1001_NAME_LEN_WITH_NULL];
 203         __u32 sequence_number; /* for signing, protected by srv_mutex */
 204         struct session_key session_key;
 205         unsigned long lstrp; /* when we got last response from this server */
 206         struct cifs_secmech secmech; /* crypto sec mech functs, descriptors */
 207         /* extended security flavors that server supports */
 208         bool    sec_ntlmssp;            /* supports NTLMSSP */
 209         bool    sec_kerberosu2u;        /* supports U2U Kerberos */
 210         bool    sec_kerberos;           /* supports plain Kerberos */
 211         bool    sec_mskerberos;         /* supports legacy MS Kerberos */
 212         struct delayed_work     echo; /* echo ping workqueue job */
 213 #ifdef CONFIG_CIFS_FSCACHE
 214         struct fscache_cookie   *fscache; /* client index cache cookie */
 215 #endif
 216 #ifdef CONFIG_CIFS_STATS2
 217         atomic_t inSend; /* requests trying to send */
 218         atomic_t num_waiters;   /* blocked waiting to get in sendrecv */
 219 #endif
 220 };
 221
 222 /*
 223  * Macros to allow the TCP_Server_Info->net field and related code to drop out
 224  * when CONFIG_NET_NS isn't set.
 225  */
 226
 227 #ifdef CONFIG_NET_NS
 228
 229 static inline struct net *cifs_net_ns(struct TCP_Server_Info *srv)
 230 {
 231         return srv->net;
 232 }
 233
 234 static inline void cifs_set_net_ns(struct TCP_Server_Info *srv, struct net *net)
 235 {
 236         srv->net = net;
 237 }
 238
 239 #else
 240
 241 static inline struct net *cifs_net_ns(struct TCP_Server_Info *srv)
 242 {
 243         return &init_net;
 244 }
 245
 246 static inline void cifs_set_net_ns(struct TCP_Server_Info *srv, struct net *net)
 247 {
 248 }
 249
 250 #endif
 251
 252 /*
 253  * Session structure.  One of these for each uid session with a particular host
 254  */
 255 struct cifsSesInfo {
 256         struct list_head smb_ses_list;
 257         struct list_head tcon_list;
 258         struct mutex session_mutex;
 259         struct TCP_Server_Info *server; /* pointer to server info */
 260         int ses_count;          /* reference counter */
 261         enum statusEnum status;
 262         unsigned overrideSecFlg;  /* if non-zero override global sec flags */
 263         __u16 ipc_tid;          /* special tid for connection to IPC share */
 264         __u16 flags;
 265         __u16 vcnum;
 266         char *serverOS;         /* name of operating system underlying server */
 267         char *serverNOS;        /* name of network operating system of server */
 268         char *serverDomain;     /* security realm of server */
 269         int Suid;               /* remote smb uid  */
 270         uid_t linux_uid;        /* overriding owner of files on the mount */
 271         uid_t cred_uid;         /* owner of credentials */
 272         int capabilities;
 273         char serverName[SERVER_NAME_LEN_WITH_NULL * 2]; /* BB make bigger for
 274                                 TCP names - will ipv6 and sctp addresses fit? */
 275         char userName[MAX_USERNAME_SIZE + 1];
 276         char *domainName;
 277         char *password;
 278         struct session_key auth_key;
 279         struct ntlmssp_auth *ntlmssp; /* ciphertext, flags, server challenge */
 280         bool need_reconnect:1; /* connection reset, uid now invalid */
 281 };
 282 /* no more than one of the following three session flags may be set */
 283 #define CIFS_SES_NT4 1
 284 #define CIFS_SES_OS2 2
 285 #define CIFS_SES_W9X 4
 286 /* following flag is set for old servers such as OS2 (and Win95?)
 287    which do not negotiate NTLM or POSIX dialects, but instead
 288    negotiate one of the older LANMAN dialects */
 289 #define CIFS_SES_LANMAN 8
 290 /*
 291  * there is one of these for each connection to a resource on a particular
 292  * session
 293  */
 294 struct cifsTconInfo {
 295         struct list_head tcon_list;
 296         int tc_count;
 297         struct list_head openFileList;
 298         struct cifsSesInfo *ses;        /* pointer to session associated with */
 299         char treeName[MAX_TREE_SIZE + 1]; /* UNC name of resource in ASCII */
 300         char *nativeFileSystem;
 301         char *password;         /* for share-level security */
 302         __u16 tid;              /* The 2 byte tree id */
 303         __u16 Flags;            /* optional support bits */
 304         enum statusEnum tidStatus;
 305 #ifdef CONFIG_CIFS_STATS
 306         atomic_t num_smbs_sent;
 307         atomic_t num_writes;
 308         atomic_t num_reads;
 309         atomic_t num_flushes;
 310         atomic_t num_oplock_brks;
 311         atomic_t num_opens;
 312         atomic_t num_closes;
 313         atomic_t num_deletes;
 314         atomic_t num_mkdirs;
 315         atomic_t num_posixopens;
 316         atomic_t num_posixmkdirs;
 317         atomic_t num_rmdirs;
 318         atomic_t num_renames;
 319         atomic_t num_t2renames;
 320         atomic_t num_ffirst;
 321         atomic_t num_fnext;
 322         atomic_t num_fclose;
 323         atomic_t num_hardlinks;
 324         atomic_t num_symlinks;
 325         atomic_t num_locks;
 326         atomic_t num_acl_get;
 327         atomic_t num_acl_set;
 328 #ifdef CONFIG_CIFS_STATS2
 329         unsigned long long time_writes;
 330         unsigned long long time_reads;
 331         unsigned long long time_opens;
 332         unsigned long long time_deletes;
 333         unsigned long long time_closes;
 334         unsigned long long time_mkdirs;
 335         unsigned long long time_rmdirs;
 336         unsigned long long time_renames;
 337         unsigned long long time_t2renames;
 338         unsigned long long time_ffirst;
 339         unsigned long long time_fnext;
 340         unsigned long long time_fclose;
 341 #endif /* CONFIG_CIFS_STATS2 */
 342         __u64    bytes_read;
 343         __u64    bytes_written;
 344         spinlock_t stat_lock;
 345 #endif /* CONFIG_CIFS_STATS */
 346         FILE_SYSTEM_DEVICE_INFO fsDevInfo;
 347         FILE_SYSTEM_ATTRIBUTE_INFO fsAttrInfo; /* ok if fs name truncated */
 348         FILE_SYSTEM_UNIX_INFO fsUnixInfo;
 349         bool ipc:1;             /* set if connection to IPC$ eg for RPC/PIPES */
 350         bool retry:1;
 351         bool nocase:1;
 352         bool seal:1;      /* transport encryption for this mounted share */
 353         bool unix_ext:1;  /* if false disable Linux extensions to CIFS protocol
 354                                 for this mount even if server would support */
 355         bool local_lease:1; /* check leases (only) on local system not remote */
 356         bool broken_posix_open; /* e.g. Samba server versions < 3.3.2, 3.2.9 */
 357         bool need_reconnect:1; /* connection reset, tid now invalid */
 358 #ifdef CONFIG_CIFS_FSCACHE
 359         u64 resource_id;                /* server resource id */
 360         struct fscache_cookie *fscache; /* cookie for share */
 361 #endif
 362         /* BB add field for back pointer to sb struct(s)? */
 363 };
 364
 365 /*
 366  * This is a refcounted and timestamped container for a tcon pointer. The
 367  * container holds a tcon reference. It is considered safe to free one of
 368  * these when the tl_count goes to 0. The tl_time is the time of the last
 369  * "get" on the container.
 370  */
 371 struct tcon_link {
 372         struct rb_node          tl_rbnode;
 373         uid_t                   tl_uid;
 374         unsigned long           tl_flags;
 375 #define TCON_LINK_MASTER        0
 376 #define TCON_LINK_PENDING       1
 377 #define TCON_LINK_IN_TREE       2
 378         unsigned long           tl_time;
 379         atomic_t                tl_count;
 380         struct cifsTconInfo     *tl_tcon;
 381 };
 382
 383 extern struct tcon_link *cifs_sb_tlink(struct cifs_sb_info *cifs_sb);
 384
 385 static inline struct cifsTconInfo *
 386 tlink_tcon(struct tcon_link *tlink)
 387 {
 388         return tlink->tl_tcon;
 389 }
 390
 391 extern void cifs_put_tlink(struct tcon_link *tlink);
 392
 393 static inline struct tcon_link *
 394 cifs_get_tlink(struct tcon_link *tlink)
 395 {
 396         if (tlink && !IS_ERR(tlink))
 397                 atomic_inc(&tlink->tl_count);
 398         return tlink;
 399 }
 400
 401 /* This function is always expected to succeed */
 402 extern struct cifsTconInfo *cifs_sb_master_tcon(struct cifs_sb_info *cifs_sb);
 403
 404 /*
 405  * This info hangs off the cifsFileInfo structure, pointed to by llist.
 406  * This is used to track byte stream locks on the file
 407  */
 408 struct cifsLockInfo {
 409         struct list_head llist; /* pointer to next cifsLockInfo */
 410         __u64 offset;
 411         __u64 length;
 412         __u8 type;
 413 };
 414
 415 /*
 416  * One of these for each open instance of a file
 417  */
 418 struct cifs_search_info {
 419         loff_t index_of_last_entry;
 420         __u16 entries_in_buffer;
 421         __u16 info_level;
 422         __u32 resume_key;
 423         char *ntwrk_buf_start;
 424         char *srch_entries_start;
 425         char *last_entry;
 426         char *presume_name;
 427         unsigned int resume_name_len;
 428         bool endOfSearch:1;
 429         bool emptyDir:1;
 430         bool unicode:1;
 431         bool smallBuf:1; /* so we know which buf_release function to call */
 432 };
 433
 434 struct cifsFileInfo {
 435         struct list_head tlist; /* pointer to next fid owned by tcon */
 436         struct list_head flist; /* next fid (file instance) for this inode */
 437         unsigned int uid;       /* allows finding which FileInfo structure */
 438         __u32 pid;              /* process id who opened file */
 439         __u16 netfid;           /* file id from remote */
 440         /* BB add lock scope info here if needed */ ;
 441         /* lock scope id (0 if none) */
 442         struct dentry *dentry;
 443         unsigned int f_flags;
 444         struct tcon_link *tlink;
 445         struct mutex lock_mutex;
 446         struct list_head llist; /* list of byte range locks we have. */
 447         bool invalidHandle:1;   /* file closed via session abend */
 448         bool oplock_break_cancelled:1;
 449         int count;              /* refcount protected by cifs_file_list_lock */
 450         struct mutex fh_mutex; /* prevents reopen race after dead ses*/
 451         struct cifs_search_info srch_inf;
 452         struct work_struct oplock_break; /* work for oplock breaks */
 453 };
 454
 455 /*
 456  * Take a reference on the file private data. Must be called with
 457  * cifs_file_list_lock held.
 458  */
 459 static inline void cifsFileInfo_get(struct cifsFileInfo *cifs_file)
 460 {
 461         ++cifs_file->count;
 462 }
 463
 464 void cifsFileInfo_put(struct cifsFileInfo *cifs_file);
 465
 466 /*
 467  * One of these for each file inode
 468  */
 469
 470 struct cifsInodeInfo {
 471         struct list_head lockList;
 472         /* BB add in lists for dirty pages i.e. write caching info for oplock */
 473         struct list_head openFileList;
 474         __u32 cifsAttrs; /* e.g. DOS archive bit, sparse, compressed, system */
 475         bool clientCanCacheRead;        /* read oplock */
 476         bool clientCanCacheAll;         /* read and writebehind oplock */
 477         bool delete_pending;            /* DELETE_ON_CLOSE is set */
 478         bool invalid_mapping;           /* pagecache is invalid */
 479         unsigned long time;             /* jiffies of last update of inode */
 480         u64  server_eof;                /* current file size on server */
 481         u64  uniqueid;                  /* server inode number */
 482         u64  createtime;                /* creation time on server */
 483 #ifdef CONFIG_CIFS_FSCACHE
 484         struct fscache_cookie *fscache;
 485 #endif
 486         struct inode vfs_inode;
 487 };
 488
 489 static inline struct cifsInodeInfo *
 490 CIFS_I(struct inode *inode)
 491 {
 492         return container_of(inode, struct cifsInodeInfo, vfs_inode);
 493 }
 494
 495 static inline struct cifs_sb_info *
 496 CIFS_SB(struct super_block *sb)
 497 {
 498         return sb->s_fs_info;
 499 }
 500
 501 static inline char CIFS_DIR_SEP(const struct cifs_sb_info *cifs_sb)
 502 {
 503         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_POSIX_PATHS)
 504                 return '/';
 505         else
 506                 return '\\';
 507 }
 508
 509 #ifdef CONFIG_CIFS_STATS
 510 #define cifs_stats_inc atomic_inc
 511
 512 static inline void cifs_stats_bytes_written(struct cifsTconInfo *tcon,
 513                                             unsigned int bytes)
 514 {
 515         if (bytes) {
 516                 spin_lock(&tcon->stat_lock);
 517                 tcon->bytes_written += bytes;
 518                 spin_unlock(&tcon->stat_lock);
 519         }
 520 }
 521
 522 static inline void cifs_stats_bytes_read(struct cifsTconInfo *tcon,
 523                                          unsigned int bytes)
 524 {
 525         spin_lock(&tcon->stat_lock);
 526         tcon->bytes_read += bytes;
 527         spin_unlock(&tcon->stat_lock);
 528 }
 529 #else
 530
 531 #define  cifs_stats_inc(field) do {} while (0)
 532 #define  cifs_stats_bytes_written(tcon, bytes) do {} while (0)
 533 #define  cifs_stats_bytes_read(tcon, bytes) do {} while (0)
 534
 535 #endif
 536
 537 struct mid_q_entry;
 538
 539 /*
 540  * This is the prototype for the mid callback function. When creating one,
 541  * take special care to avoid deadlocks. Things to bear in mind:
 542  *
 543  * - it will be called by cifsd
 544  * - the GlobalMid_Lock will be held
 545  * - the mid will be removed from the pending_mid_q list
 546  */
 547 typedef void (mid_callback_t)(struct mid_q_entry *mid);
 548
 549 /* one of these for every pending CIFS request to the server */
 550 struct mid_q_entry {
 551         struct list_head qhead; /* mids waiting on reply from this server */
 552         __u16 mid;              /* multiplex id */
 553         __u16 pid;              /* process id */
 554         __u32 sequence_number;  /* for CIFS signing */
 555         unsigned long when_alloc;  /* when mid was created */
 556 #ifdef CONFIG_CIFS_STATS2
 557         unsigned long when_sent; /* time when smb send finished */
 558         unsigned long when_received; /* when demux complete (taken off wire) */
 559 #endif
 560         mid_callback_t *callback; /* call completion callback */
 561         void *callback_data;      /* general purpose pointer for callback */
 562         struct smb_hdr *resp_buf;       /* response buffer */
 563         int midState;   /* wish this were enum but can not pass to wait_event */
 564         __u8 command;   /* smb command code */
 565         bool largeBuf:1;        /* if valid response, is pointer to large buf */
 566         bool multiRsp:1;        /* multiple trans2 responses for one request  */
 567         bool multiEnd:1;        /* both received */
 568 };
 569
 570 struct oplock_q_entry {
 571         struct list_head qhead;
 572         struct inode *pinode;
 573         struct cifsTconInfo *tcon;
 574         __u16 netfid;
 575 };
 576
 577 /* for pending dnotify requests */
 578 struct dir_notify_req {
 579         struct list_head lhead;
 580         __le16 Pid;
 581         __le16 PidHigh;
 582         __u16 Mid;
 583         __u16 Tid;
 584         __u16 Uid;
 585         __u16 netfid;
 586         __u32 filter; /* CompletionFilter (for multishot) */
 587         int multishot;
 588         struct file *pfile;
 589 };
 590
 591 struct dfs_info3_param {
 592         int flags; /* DFSREF_REFERRAL_SERVER, DFSREF_STORAGE_SERVER*/
 593         int path_consumed;
 594         int server_type;
 595         int ref_flag;
 596         char *path_name;
 597         char *node_name;
 598 };
 599
 600 /*
 601  * common struct for holding inode info when searching for or updating an
 602  * inode with new info
 603  */
 604
 605 #define CIFS_FATTR_DFS_REFERRAL         0x1
 606 #define CIFS_FATTR_DELETE_PENDING       0x2
 607 #define CIFS_FATTR_NEED_REVAL           0x4
 608 #define CIFS_FATTR_INO_COLLISION        0x8
 609
 610 struct cifs_fattr {
 611         u32             cf_flags;
 612         u32             cf_cifsattrs;
 613         u64             cf_uniqueid;
 614         u64             cf_eof;
 615         u64             cf_bytes;
 616         u64             cf_createtime;
 617         uid_t           cf_uid;
 618         gid_t           cf_gid;
 619         umode_t         cf_mode;
 620         dev_t           cf_rdev;
 621         unsigned int    cf_nlink;
 622         unsigned int    cf_dtype;
 623         struct timespec cf_atime;
 624         struct timespec cf_mtime;
 625         struct timespec cf_ctime;
 626 };
 627
 628 static inline void free_dfs_info_param(struct dfs_info3_param *param)
 629 {
 630         if (param) {
 631                 kfree(param->path_name);
 632                 kfree(param->node_name);
 633                 kfree(param);
 634         }
 635 }
 636
 637 static inline void free_dfs_info_array(struct dfs_info3_param *param,
 638                                        int number_of_items)
 639 {
 640         int i;
 641         if ((number_of_items == 0) || (param == NULL))
 642                 return;
 643         for (i = 0; i < number_of_items; i++) {
 644                 kfree(param[i].path_name);
 645                 kfree(param[i].node_name);
 646         }
 647         kfree(param);
 648 }
 649
 650 #define   MID_FREE 0
 651 #define   MID_REQUEST_ALLOCATED 1
 652 #define   MID_REQUEST_SUBMITTED 2
 653 #define   MID_RESPONSE_RECEIVED 4
 654 #define   MID_RETRY_NEEDED      8 /* session closed while this request out */
 655 #define   MID_NO_RESP_NEEDED 0x10
 656
 657 /* Types of response buffer returned from SendReceive2 */
 658 #define   CIFS_NO_BUFFER        0    /* Response buffer not returned */
 659 #define   CIFS_SMALL_BUFFER     1
 660 #define   CIFS_LARGE_BUFFER     2
 661 #define   CIFS_IOVEC            4    /* array of response buffers */
 662
 663 /* Type of Request to SendReceive2 */
 664 #define   CIFS_BLOCKING_OP      1    /* operation can block */
 665 #define   CIFS_ASYNC_OP         2    /* do not wait for response */
 666 #define   CIFS_TIMEOUT_MASK 0x003    /* only one of above set in req */
 667 #define   CIFS_LOG_ERROR    0x010    /* log NT STATUS if non-zero */
 668 #define   CIFS_LARGE_BUF_OP 0x020    /* large request buffer */
 669 #define   CIFS_NO_RESP      0x040    /* no response buffer required */
 670
 671 /* Security Flags: indicate type of session setup needed */
 672 #define   CIFSSEC_MAY_SIGN      0x00001
 673 #define   CIFSSEC_MAY_NTLM      0x00002
 674 #define   CIFSSEC_MAY_NTLMV2    0x00004
 675 #define   CIFSSEC_MAY_KRB5      0x00008
 676 #ifdef CONFIG_CIFS_WEAK_PW_HASH
 677 #define   CIFSSEC_MAY_LANMAN    0x00010
 678 #define   CIFSSEC_MAY_PLNTXT    0x00020
 679 #else
 680 #define   CIFSSEC_MAY_LANMAN    0
 681 #define   CIFSSEC_MAY_PLNTXT    0
 682 #endif /* weak passwords */
 683 #define   CIFSSEC_MAY_SEAL      0x00040 /* not supported yet */
 684 #define   CIFSSEC_MAY_NTLMSSP   0x00080 /* raw ntlmssp with ntlmv2 */
 685
 686 #define   CIFSSEC_MUST_SIGN     0x01001
 687 /* note that only one of the following can be set so the
 688 result of setting MUST flags more than once will be to
 689 require use of the stronger protocol */
 690 #define   CIFSSEC_MUST_NTLM     0x02002
 691 #define   CIFSSEC_MUST_NTLMV2   0x04004
 692 #define   CIFSSEC_MUST_KRB5     0x08008
 693 #ifdef CONFIG_CIFS_WEAK_PW_HASH
 694 #define   CIFSSEC_MUST_LANMAN   0x10010
 695 #define   CIFSSEC_MUST_PLNTXT   0x20020
 696 #ifdef CONFIG_CIFS_UPCALL
 697 #define   CIFSSEC_MASK          0xBF0BF /* allows weak security but also krb5 */
 698 #else
 699 #define   CIFSSEC_MASK          0xB70B7 /* current flags supported if weak */
 700 #endif /* UPCALL */
 701 #else /* do not allow weak pw hash */
 702 #ifdef CONFIG_CIFS_UPCALL
 703 #define   CIFSSEC_MASK          0x8F08F /* flags supported if no weak allowed */
 704 #else
 705 #define   CIFSSEC_MASK          0x87087 /* flags supported if no weak allowed */
 706 #endif /* UPCALL */
 707 #endif /* WEAK_PW_HASH */
 708 #define   CIFSSEC_MUST_SEAL     0x40040 /* not supported yet */
 709 #define   CIFSSEC_MUST_NTLMSSP  0x80080 /* raw ntlmssp with ntlmv2 */
 710
 711 #define   CIFSSEC_DEF (CIFSSEC_MAY_SIGN | CIFSSEC_MAY_NTLM | CIFSSEC_MAY_NTLMV2)
 712 #define   CIFSSEC_MAX (CIFSSEC_MUST_SIGN | CIFSSEC_MUST_NTLMV2)
 713 #define   CIFSSEC_AUTH_MASK (CIFSSEC_MAY_NTLM | CIFSSEC_MAY_NTLMV2 | CIFSSEC_MAY_LANMAN | CIFSSEC_MAY_PLNTXT | CIFSSEC_MAY_KRB5 | CIFSSEC_MAY_NTLMSSP)
 714 /*
 715  *****************************************************************
 716  * All constants go here
 717  *****************************************************************
 718  */
 719
 720 #define UID_HASH (16)
 721
 722 /*
 723  * Note that ONE module should define _DECLARE_GLOBALS_HERE to cause the
 724  * following to be declared.
 725  */
 726
 727 /****************************************************************************
 728  *  Locking notes.  All updates to global variables and lists should be
 729  *                  protected by spinlocks or semaphores.
 730  *
 731  *  Spinlocks
 732  *  ---------
 733  *  GlobalMid_Lock protects:
 734  *      list operations on pending_mid_q and oplockQ
 735  *      updates to XID counters, multiplex id  and SMB sequence numbers
 736  *  cifs_file_list_lock protects:
 737  *      list operations on tcp and SMB session lists and tCon lists
 738  *  f_owner.lock protects certain per file struct operations
 739  *  mapping->page_lock protects certain per page operations
 740  *
 741  *  Semaphores
 742  *  ----------
 743  *  sesSem     operations on smb session
 744  *  tconSem    operations on tree connection
 745  *  fh_sem      file handle reconnection operations
 746  *
 747  ****************************************************************************/
 748
 749 #ifdef DECLARE_GLOBALS_HERE
 750 #define GLOBAL_EXTERN
 751 #else
 752 #define GLOBAL_EXTERN extern
 753 #endif
 754
 755 /*
 756  * the list of TCP_Server_Info structures, ie each of the sockets
 757  * connecting our client to a distinct server (ip address), is
 758  * chained together by cifs_tcp_ses_list. The list of all our SMB
 759  * sessions (and from that the tree connections) can be found
 760  * by iterating over cifs_tcp_ses_list
 761  */
 762 GLOBAL_EXTERN struct list_head          cifs_tcp_ses_list;
 763
 764 /*
 765  * This lock protects the cifs_tcp_ses_list, the list of smb sessions per
 766  * tcp session, and the list of tcon's per smb session. It also protects
 767  * the reference counters for the server, smb session, and tcon. Finally,
 768  * changes to the tcon->tidStatus should be done while holding this lock.
 769  */
 770 GLOBAL_EXTERN spinlock_t                cifs_tcp_ses_lock;
 771
 772 /*
 773  * This lock protects the cifs_file->llist and cifs_file->flist
 774  * list operations, and updates to some flags (cifs_file->invalidHandle)
 775  * It will be moved to either use the tcon->stat_lock or equivalent later.
 776  * If cifs_tcp_ses_lock and the lock below are both needed to be held, then
 777  * the cifs_tcp_ses_lock must be grabbed first and released last.
 778  */
 779 GLOBAL_EXTERN spinlock_t        cifs_file_list_lock;
 780
 781 /* Outstanding dir notify requests */
 782 GLOBAL_EXTERN struct list_head GlobalDnotifyReqList;
 783 /* DirNotify response queue */
 784 GLOBAL_EXTERN struct list_head GlobalDnotifyRsp_Q;
 785
 786 /*
 787  * Global transaction id (XID) information
 788  */
 789 GLOBAL_EXTERN unsigned int GlobalCurrentXid;    /* protected by GlobalMid_Sem */
 790 GLOBAL_EXTERN unsigned int GlobalTotalActiveXid; /* prot by GlobalMid_Sem */
 791 GLOBAL_EXTERN unsigned int GlobalMaxActiveXid;  /* prot by GlobalMid_Sem */
 792 GLOBAL_EXTERN spinlock_t GlobalMid_Lock;  /* protects above & list operations */
 793                                           /* on midQ entries */
 794 /*
 795  *  Global counters, updated atomically
 796  */
 797 GLOBAL_EXTERN atomic_t sesInfoAllocCount;
 798 GLOBAL_EXTERN atomic_t tconInfoAllocCount;
 799 GLOBAL_EXTERN atomic_t tcpSesAllocCount;
 800 GLOBAL_EXTERN atomic_t tcpSesReconnectCount;
 801 GLOBAL_EXTERN atomic_t tconInfoReconnectCount;
 802
 803 /* Various Debug counters */
 804 GLOBAL_EXTERN atomic_t bufAllocCount;    /* current number allocated  */
 805 #ifdef CONFIG_CIFS_STATS2
 806 GLOBAL_EXTERN atomic_t totBufAllocCount; /* total allocated over all time */
 807 GLOBAL_EXTERN atomic_t totSmBufAllocCount;
 808 #endif
 809 GLOBAL_EXTERN atomic_t smBufAllocCount;
 810 GLOBAL_EXTERN atomic_t midCount;
 811
 812 /* Misc globals */
 813 GLOBAL_EXTERN unsigned int multiuser_mount; /* if enabled allows new sessions
 814                                 to be established on existing mount if we
 815                                 have the uid/password or Kerberos credential
 816                                 or equivalent for current user */
 817 GLOBAL_EXTERN unsigned int oplockEnabled;
 818 GLOBAL_EXTERN unsigned int experimEnabled;
 819 GLOBAL_EXTERN unsigned int lookupCacheEnabled;
 820 GLOBAL_EXTERN unsigned int global_secflags;     /* if on, session setup sent
 821                                 with more secure ntlmssp2 challenge/resp */
 822 GLOBAL_EXTERN unsigned int sign_CIFS_PDUs;  /* enable smb packet signing */
 823 GLOBAL_EXTERN unsigned int linuxExtEnabled;/*enable Linux/Unix CIFS extensions*/
 824 GLOBAL_EXTERN unsigned int CIFSMaxBufSize;  /* max size not including hdr */
 825 GLOBAL_EXTERN unsigned int cifs_min_rcv;    /* min size of big ntwrk buf pool */
 826 GLOBAL_EXTERN unsigned int cifs_min_small;  /* min size of small buf pool */
 827 GLOBAL_EXTERN unsigned int cifs_max_pending; /* MAX requests at once to server*/
 828
 829 /* reconnect after this many failed echo attempts */
 830 GLOBAL_EXTERN unsigned short echo_retries;
 831
 832 void cifs_oplock_break(struct work_struct *work);
 833 void cifs_oplock_break_get(struct cifsFileInfo *cfile);
 834 void cifs_oplock_break_put(struct cifsFileInfo *cfile);
 835
 836 extern const struct slow_work_ops cifs_oplock_break_ops;
 837
 838 #endif  /* _CIFS_GLOB_H */