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