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  * MAX_REQ is the maximum number of requests that WE will send
  49  * on one socket concurrently. It also matches the most common
  50  * value of max multiplex returned by servers.  We may
  51  * eventually want to use the negotiated value (in case
  52  * future servers can handle more) when we are more confident that
  53  * we will not have problems oveloading the socket with pending
  54  * write data.
  55  */
  56 #define CIFS_MAX_REQ 50
  57
  58 #define RFC1001_NAME_LEN 15
  59 #define RFC1001_NAME_LEN_WITH_NULL (RFC1001_NAME_LEN + 1)
  60
  61 /* currently length of NIP6_FMT */
  62 #define SERVER_NAME_LENGTH 40
  63 #define SERVER_NAME_LEN_WITH_NULL     (SERVER_NAME_LENGTH + 1)
  64
  65 /* used to define string lengths for reversing unicode strings */
  66 /*         (256+1)*2 = 514                                     */
  67 /*           (max path length + 1 for null) * 2 for unicode    */
  68 #define MAX_NAME 514
  69
  70 #include "cifspdu.h"
  71
  72 #ifndef XATTR_DOS_ATTRIB
  73 #define XATTR_DOS_ATTRIB "user.DOSATTRIB"
  74 #endif
  75
  76 /*
  77  * CIFS vfs client Status information (based on what we know.)
  78  */
  79
  80  /* associated with each tcp and smb session */
  81 enum statusEnum {
  82         CifsNew = 0,
  83         CifsGood,
  84         CifsExiting,
  85         CifsNeedReconnect
  86 };
  87
  88 enum securityEnum {
  89         LANMAN = 0,                     /* Legacy LANMAN auth */
  90         NTLM,                   /* Legacy NTLM012 auth with NTLM hash */
  91         NTLMv2,                 /* Legacy NTLM auth with NTLMv2 hash */
  92         RawNTLMSSP,             /* NTLMSSP without SPNEGO, NTLMv2 hash */
  93 /*      NTLMSSP, */ /* can use rawNTLMSSP instead of NTLMSSP via SPNEGO */
  94         Kerberos,               /* Kerberos via SPNEGO */
  95 };
  96
  97 enum protocolEnum {
  98         TCP = 0,
  99         SCTP
 100         /* Netbios frames protocol not supported at this time */
 101 };
 102
 103 struct session_key {
 104         unsigned int len;
 105         union {
 106                 char ntlm[CIFS_SESS_KEY_SIZE + 16];
 107                 char krb5[CIFS_SESS_KEY_SIZE + 16]; /* BB: length correct? */
 108                 struct {
 109                         char key[16];
 110                         struct ntlmv2_resp resp;
 111                 } ntlmv2;
 112         } data;
 113 };
 114
 115 struct cifs_cred {
 116         int uid;
 117         int gid;
 118         int mode;
 119         int cecount;
 120         struct cifs_sid osid;
 121         struct cifs_sid gsid;
 122         struct cifs_ntace *ntaces;
 123         struct cifs_ace *aces;
 124 };
 125
 126 struct ntlmssp_auth {
 127         __u32 client_flags;
 128         __u32 server_flags;
 129         unsigned char ciphertext[CIFS_CPHTXT_SIZE];
 130         struct crypto_shash *hmacmd5;
 131         struct crypto_shash *md5;
 132 };
 133
 134 /*
 135  *****************************************************************
 136  * Except the CIFS PDUs themselves all the
 137  * globally interesting structs should go here
 138  *****************************************************************
 139  */
 140
 141 struct TCP_Server_Info {
 142         struct list_head tcp_ses_list;
 143         struct list_head smb_ses_list;
 144         int srv_count; /* reference counter */
 145         /* 15 character server name + 0x20 16th byte indicating type = srv */
 146         char server_RFC1001_name[RFC1001_NAME_LEN_WITH_NULL];
 147         char *hostname; /* hostname portion of UNC string */
 148         struct socket *ssocket;
 149         union {
 150                 struct sockaddr_in sockAddr;
 151                 struct sockaddr_in6 sockAddr6;
 152         } addr;
 153         wait_queue_head_t response_q;
 154         wait_queue_head_t request_q; /* if more than maxmpx to srvr must block*/
 155         struct list_head pending_mid_q;
 156         void *Server_NlsInfo;   /* BB - placeholder for future NLS info  */
 157         unsigned short server_codepage; /* codepage for the server    */
 158         enum protocolEnum protocolType;
 159         char versionMajor;
 160         char versionMinor;
 161         bool svlocal:1;                 /* local server or remote */
 162         bool noblocksnd;                /* use blocking sendmsg */
 163         bool noautotune;                /* do not autotune send buf sizes */
 164         bool tcp_nodelay;
 165         atomic_t inFlight;  /* number of requests on the wire to server */
 166 #ifdef CONFIG_CIFS_STATS2
 167         atomic_t inSend; /* requests trying to send */
 168         atomic_t num_waiters;   /* blocked waiting to get in sendrecv */
 169 #endif
 170         enum statusEnum tcpStatus; /* what we think the status is */
 171         struct mutex srv_mutex;
 172         struct task_struct *tsk;
 173         char server_GUID[16];
 174         char secMode;
 175         enum securityEnum secType;
 176         unsigned int maxReq;    /* Clients should submit no more */
 177         /* than maxReq distinct unanswered SMBs to the server when using  */
 178         /* multiplexed reads or writes */
 179         unsigned int maxBuf;    /* maxBuf specifies the maximum */
 180         /* message size the server can send or receive for non-raw SMBs */
 181         unsigned int max_rw;    /* maxRw specifies the maximum */
 182         /* message size the server can send or receive for */
 183         /* SMB_COM_WRITE_RAW or SMB_COM_READ_RAW. */
 184         unsigned int max_vcs;   /* maximum number of smb sessions, at least
 185                                    those that can be specified uniquely with
 186                                    vcnumbers */
 187         char sessid[4];         /* unique token id for this session */
 188         /* (returned on Negotiate */
 189         int capabilities; /* allow selective disabling of caps by smb sess */
 190         int timeAdj;  /* Adjust for difference in server time zone in sec */
 191         __u16 CurrentMid;         /* multiplex id - rotating counter */
 192         char cryptKey[CIFS_CRYPTO_KEY_SIZE];
 193         /* 16th byte of RFC1001 workstation name is always null */
 194         char workstation_RFC1001_name[RFC1001_NAME_LEN_WITH_NULL];
 195         __u32 sequence_number; /* needed for CIFS PDU signature */
 196         struct session_key session_key;
 197         char ntlmv2_hash[16];
 198         unsigned long lstrp; /* when we got last response from this server */
 199         u16 dialect; /* dialect index that server chose */
 200         /* extended security flavors that server supports */
 201         unsigned int tilen; /* length of the target info blob */
 202         unsigned char *tiblob; /* target info blob in challenge response */
 203         struct ntlmssp_auth ntlmssp; /* various keys, ciphers, flags */
 204         bool    sec_kerberos;           /* supports plain Kerberos */
 205         bool    sec_mskerberos;         /* supports legacy MS Kerberos */
 206         bool    sec_kerberosu2u;        /* supports U2U Kerberos */
 207         bool    sec_ntlmssp;            /* supports NTLMSSP */
 208 #ifdef CONFIG_CIFS_FSCACHE
 209         struct fscache_cookie   *fscache; /* client index cache cookie */
 210 #endif
 211 };
 212
 213 /*
 214  * Session structure.  One of these for each uid session with a particular host
 215  */
 216 struct cifsSesInfo {
 217         struct list_head smb_ses_list;
 218         struct list_head tcon_list;
 219         struct mutex session_mutex;
 220         struct TCP_Server_Info *server; /* pointer to server info */
 221         int ses_count;          /* reference counter */
 222         enum statusEnum status;
 223         unsigned overrideSecFlg;  /* if non-zero override global sec flags */
 224         __u16 ipc_tid;          /* special tid for connection to IPC share */
 225         __u16 flags;
 226         __u16 vcnum;
 227         char *serverOS;         /* name of operating system underlying server */
 228         char *serverNOS;        /* name of network operating system of server */
 229         char *serverDomain;     /* security realm of server */
 230         int Suid;               /* remote smb uid  */
 231         uid_t linux_uid;        /* overriding owner of files on the mount */
 232         uid_t cred_uid;         /* owner of credentials */
 233         int capabilities;
 234         char serverName[SERVER_NAME_LEN_WITH_NULL * 2]; /* BB make bigger for
 235                                 TCP names - will ipv6 and sctp addresses fit? */
 236         char userName[MAX_USERNAME_SIZE + 1];
 237         char *domainName;
 238         char *password;
 239         bool need_reconnect:1; /* connection reset, uid now invalid */
 240 };
 241 /* no more than one of the following three session flags may be set */
 242 #define CIFS_SES_NT4 1
 243 #define CIFS_SES_OS2 2
 244 #define CIFS_SES_W9X 4
 245 /* following flag is set for old servers such as OS2 (and Win95?)
 246    which do not negotiate NTLM or POSIX dialects, but instead
 247    negotiate one of the older LANMAN dialects */
 248 #define CIFS_SES_LANMAN 8
 249 /*
 250  * there is one of these for each connection to a resource on a particular
 251  * session
 252  */
 253 struct cifsTconInfo {
 254         struct list_head tcon_list;
 255         int tc_count;
 256         struct list_head openFileList;
 257         struct cifsSesInfo *ses;        /* pointer to session associated with */
 258         char treeName[MAX_TREE_SIZE + 1]; /* UNC name of resource in ASCII */
 259         char *nativeFileSystem;
 260         char *password;         /* for share-level security */
 261         __u16 tid;              /* The 2 byte tree id */
 262         __u16 Flags;            /* optional support bits */
 263         enum statusEnum tidStatus;
 264 #ifdef CONFIG_CIFS_STATS
 265         atomic_t num_smbs_sent;
 266         atomic_t num_writes;
 267         atomic_t num_reads;
 268         atomic_t num_flushes;
 269         atomic_t num_oplock_brks;
 270         atomic_t num_opens;
 271         atomic_t num_closes;
 272         atomic_t num_deletes;
 273         atomic_t num_mkdirs;
 274         atomic_t num_posixopens;
 275         atomic_t num_posixmkdirs;
 276         atomic_t num_rmdirs;
 277         atomic_t num_renames;
 278         atomic_t num_t2renames;
 279         atomic_t num_ffirst;
 280         atomic_t num_fnext;
 281         atomic_t num_fclose;
 282         atomic_t num_hardlinks;
 283         atomic_t num_symlinks;
 284         atomic_t num_locks;
 285         atomic_t num_acl_get;
 286         atomic_t num_acl_set;
 287 #ifdef CONFIG_CIFS_STATS2
 288         unsigned long long time_writes;
 289         unsigned long long time_reads;
 290         unsigned long long time_opens;
 291         unsigned long long time_deletes;
 292         unsigned long long time_closes;
 293         unsigned long long time_mkdirs;
 294         unsigned long long time_rmdirs;
 295         unsigned long long time_renames;
 296         unsigned long long time_t2renames;
 297         unsigned long long time_ffirst;
 298         unsigned long long time_fnext;
 299         unsigned long long time_fclose;
 300 #endif /* CONFIG_CIFS_STATS2 */
 301         __u64    bytes_read;
 302         __u64    bytes_written;
 303         spinlock_t stat_lock;
 304 #endif /* CONFIG_CIFS_STATS */
 305         FILE_SYSTEM_DEVICE_INFO fsDevInfo;
 306         FILE_SYSTEM_ATTRIBUTE_INFO fsAttrInfo; /* ok if fs name truncated */
 307         FILE_SYSTEM_UNIX_INFO fsUnixInfo;
 308         bool ipc:1;             /* set if connection to IPC$ eg for RPC/PIPES */
 309         bool retry:1;
 310         bool nocase:1;
 311         bool seal:1;      /* transport encryption for this mounted share */
 312         bool unix_ext:1;  /* if false disable Linux extensions to CIFS protocol
 313                                 for this mount even if server would support */
 314         bool local_lease:1; /* check leases (only) on local system not remote */
 315         bool broken_posix_open; /* e.g. Samba server versions < 3.3.2, 3.2.9 */
 316         bool need_reconnect:1; /* connection reset, tid now invalid */
 317 #ifdef CONFIG_CIFS_FSCACHE
 318         u64 resource_id;                /* server resource id */
 319         struct fscache_cookie *fscache; /* cookie for share */
 320 #endif
 321         /* BB add field for back pointer to sb struct(s)? */
 322 };
 323
 324 /*
 325  * This info hangs off the cifsFileInfo structure, pointed to by llist.
 326  * This is used to track byte stream locks on the file
 327  */
 328 struct cifsLockInfo {
 329         struct list_head llist; /* pointer to next cifsLockInfo */
 330         __u64 offset;
 331         __u64 length;
 332         __u8 type;
 333 };
 334
 335 /*
 336  * One of these for each open instance of a file
 337  */
 338 struct cifs_search_info {
 339         loff_t index_of_last_entry;
 340         __u16 entries_in_buffer;
 341         __u16 info_level;
 342         __u32 resume_key;
 343         char *ntwrk_buf_start;
 344         char *srch_entries_start;
 345         char *last_entry;
 346         char *presume_name;
 347         unsigned int resume_name_len;
 348         bool endOfSearch:1;
 349         bool emptyDir:1;
 350         bool unicode:1;
 351         bool smallBuf:1; /* so we know which buf_release function to call */
 352 };
 353
 354 struct cifsFileInfo {
 355         struct list_head tlist; /* pointer to next fid owned by tcon */
 356         struct list_head flist; /* next fid (file instance) for this inode */
 357         unsigned int uid;       /* allows finding which FileInfo structure */
 358         __u32 pid;              /* process id who opened file */
 359         __u16 netfid;           /* file id from remote */
 360         /* BB add lock scope info here if needed */ ;
 361         /* lock scope id (0 if none) */
 362         struct file *pfile; /* needed for writepage */
 363         struct inode *pInode; /* needed for oplock break */
 364         struct vfsmount *mnt;
 365         struct mutex lock_mutex;
 366         struct list_head llist; /* list of byte range locks we have. */
 367         bool closePend:1;       /* file is marked to close */
 368         bool invalidHandle:1;   /* file closed via session abend */
 369         bool oplock_break_cancelled:1;
 370         atomic_t count;         /* reference count */
 371         struct mutex fh_mutex; /* prevents reopen race after dead ses*/
 372         struct cifs_search_info srch_inf;
 373         struct work_struct oplock_break; /* work for oplock breaks */
 374 };
 375
 376 /* Take a reference on the file private data */
 377 static inline void cifsFileInfo_get(struct cifsFileInfo *cifs_file)
 378 {
 379         atomic_inc(&cifs_file->count);
 380 }
 381
 382 /* Release a reference on the file private data */
 383 static inline void cifsFileInfo_put(struct cifsFileInfo *cifs_file)
 384 {
 385         if (atomic_dec_and_test(&cifs_file->count)) {
 386                 iput(cifs_file->pInode);
 387                 kfree(cifs_file);
 388         }
 389 }
 390
 391 /*
 392  * One of these for each file inode
 393  */
 394
 395 struct cifsInodeInfo {
 396         struct list_head lockList;
 397         /* BB add in lists for dirty pages i.e. write caching info for oplock */
 398         struct list_head openFileList;
 399         int write_behind_rc;
 400         __u32 cifsAttrs; /* e.g. DOS archive bit, sparse, compressed, system */
 401         unsigned long time;     /* jiffies of last update/check of inode */
 402         bool clientCanCacheRead:1;      /* read oplock */
 403         bool clientCanCacheAll:1;       /* read and writebehind oplock */
 404         bool delete_pending:1;          /* DELETE_ON_CLOSE is set */
 405         bool invalid_mapping:1;         /* pagecache is invalid */
 406         u64  server_eof;                /* current file size on server */
 407         u64  uniqueid;                  /* server inode number */
 408 #ifdef CONFIG_CIFS_FSCACHE
 409         struct fscache_cookie *fscache;
 410 #endif
 411         struct inode vfs_inode;
 412 };
 413
 414 static inline struct cifsInodeInfo *
 415 CIFS_I(struct inode *inode)
 416 {
 417         return container_of(inode, struct cifsInodeInfo, vfs_inode);
 418 }
 419
 420 static inline struct cifs_sb_info *
 421 CIFS_SB(struct super_block *sb)
 422 {
 423         return sb->s_fs_info;
 424 }
 425
 426 static inline char CIFS_DIR_SEP(const struct cifs_sb_info *cifs_sb)
 427 {
 428         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_POSIX_PATHS)
 429                 return '/';
 430         else
 431                 return '\\';
 432 }
 433
 434 #ifdef CONFIG_CIFS_STATS
 435 #define cifs_stats_inc atomic_inc
 436
 437 static inline void cifs_stats_bytes_written(struct cifsTconInfo *tcon,
 438                                             unsigned int bytes)
 439 {
 440         if (bytes) {
 441                 spin_lock(&tcon->stat_lock);
 442                 tcon->bytes_written += bytes;
 443                 spin_unlock(&tcon->stat_lock);
 444         }
 445 }
 446
 447 static inline void cifs_stats_bytes_read(struct cifsTconInfo *tcon,
 448                                          unsigned int bytes)
 449 {
 450         spin_lock(&tcon->stat_lock);
 451         tcon->bytes_read += bytes;
 452         spin_unlock(&tcon->stat_lock);
 453 }
 454 #else
 455
 456 #define  cifs_stats_inc(field) do {} while (0)
 457 #define  cifs_stats_bytes_written(tcon, bytes) do {} while (0)
 458 #define  cifs_stats_bytes_read(tcon, bytes) do {} while (0)
 459
 460 #endif
 461
 462 /* one of these for every pending CIFS request to the server */
 463 struct mid_q_entry {
 464         struct list_head qhead; /* mids waiting on reply from this server */
 465         __u16 mid;              /* multiplex id */
 466         __u16 pid;              /* process id */
 467         __u32 sequence_number;  /* for CIFS signing */
 468         unsigned long when_alloc;  /* when mid was created */
 469 #ifdef CONFIG_CIFS_STATS2
 470         unsigned long when_sent; /* time when smb send finished */
 471         unsigned long when_received; /* when demux complete (taken off wire) */
 472 #endif
 473         struct task_struct *tsk;        /* task waiting for response */
 474         struct smb_hdr *resp_buf;       /* response buffer */
 475         int midState;   /* wish this were enum but can not pass to wait_event */
 476         __u8 command;   /* smb command code */
 477         bool largeBuf:1;        /* if valid response, is pointer to large buf */
 478         bool multiRsp:1;        /* multiple trans2 responses for one request  */
 479         bool multiEnd:1;        /* both received */
 480 };
 481
 482 struct oplock_q_entry {
 483         struct list_head qhead;
 484         struct inode *pinode;
 485         struct cifsTconInfo *tcon;
 486         __u16 netfid;
 487 };
 488
 489 /* for pending dnotify requests */
 490 struct dir_notify_req {
 491        struct list_head lhead;
 492        __le16 Pid;
 493        __le16 PidHigh;
 494        __u16 Mid;
 495        __u16 Tid;
 496        __u16 Uid;
 497        __u16 netfid;
 498        __u32 filter; /* CompletionFilter (for multishot) */
 499        int multishot;
 500        struct file *pfile;
 501 };
 502
 503 struct dfs_info3_param {
 504         int flags; /* DFSREF_REFERRAL_SERVER, DFSREF_STORAGE_SERVER*/
 505         int path_consumed;
 506         int server_type;
 507         int ref_flag;
 508         char *path_name;
 509         char *node_name;
 510 };
 511
 512 /*
 513  * common struct for holding inode info when searching for or updating an
 514  * inode with new info
 515  */
 516
 517 #define CIFS_FATTR_DFS_REFERRAL         0x1
 518 #define CIFS_FATTR_DELETE_PENDING       0x2
 519 #define CIFS_FATTR_NEED_REVAL           0x4
 520 #define CIFS_FATTR_INO_COLLISION        0x8
 521
 522 struct cifs_fattr {
 523         u32             cf_flags;
 524         u32             cf_cifsattrs;
 525         u64             cf_uniqueid;
 526         u64             cf_eof;
 527         u64             cf_bytes;
 528         uid_t           cf_uid;
 529         gid_t           cf_gid;
 530         umode_t         cf_mode;
 531         dev_t           cf_rdev;
 532         unsigned int    cf_nlink;
 533         unsigned int    cf_dtype;
 534         struct timespec cf_atime;
 535         struct timespec cf_mtime;
 536         struct timespec cf_ctime;
 537 };
 538
 539 static inline void free_dfs_info_param(struct dfs_info3_param *param)
 540 {
 541         if (param) {
 542                 kfree(param->path_name);
 543                 kfree(param->node_name);
 544                 kfree(param);
 545         }
 546 }
 547
 548 static inline void free_dfs_info_array(struct dfs_info3_param *param,
 549                                        int number_of_items)
 550 {
 551         int i;
 552         if ((number_of_items == 0) || (param == NULL))
 553                 return;
 554         for (i = 0; i < number_of_items; i++) {
 555                 kfree(param[i].path_name);
 556                 kfree(param[i].node_name);
 557         }
 558         kfree(param);
 559 }
 560
 561 #define   MID_FREE 0
 562 #define   MID_REQUEST_ALLOCATED 1
 563 #define   MID_REQUEST_SUBMITTED 2
 564 #define   MID_RESPONSE_RECEIVED 4
 565 #define   MID_RETRY_NEEDED      8 /* session closed while this request out */
 566 #define   MID_NO_RESP_NEEDED 0x10
 567
 568 /* Types of response buffer returned from SendReceive2 */
 569 #define   CIFS_NO_BUFFER        0    /* Response buffer not returned */
 570 #define   CIFS_SMALL_BUFFER     1
 571 #define   CIFS_LARGE_BUFFER     2
 572 #define   CIFS_IOVEC            4    /* array of response buffers */
 573
 574 /* Type of Request to SendReceive2 */
 575 #define   CIFS_STD_OP           0    /* normal request timeout */
 576 #define   CIFS_LONG_OP          1    /* long op (up to 45 sec, oplock time) */
 577 #define   CIFS_VLONG_OP         2    /* sloow op - can take up to 180 seconds */
 578 #define   CIFS_BLOCKING_OP      4    /* operation can block */
 579 #define   CIFS_ASYNC_OP         8    /* do not wait for response */
 580 #define   CIFS_TIMEOUT_MASK 0x00F    /* only one of 5 above set in req */
 581 #define   CIFS_LOG_ERROR    0x010    /* log NT STATUS if non-zero */
 582 #define   CIFS_LARGE_BUF_OP 0x020    /* large request buffer */
 583 #define   CIFS_NO_RESP      0x040    /* no response buffer required */
 584
 585 /* Security Flags: indicate type of session setup needed */
 586 #define   CIFSSEC_MAY_SIGN      0x00001
 587 #define   CIFSSEC_MAY_NTLM      0x00002
 588 #define   CIFSSEC_MAY_NTLMV2    0x00004
 589 #define   CIFSSEC_MAY_KRB5      0x00008
 590 #ifdef CONFIG_CIFS_WEAK_PW_HASH
 591 #define   CIFSSEC_MAY_LANMAN    0x00010
 592 #define   CIFSSEC_MAY_PLNTXT    0x00020
 593 #else
 594 #define   CIFSSEC_MAY_LANMAN    0
 595 #define   CIFSSEC_MAY_PLNTXT    0
 596 #endif /* weak passwords */
 597 #define   CIFSSEC_MAY_SEAL      0x00040 /* not supported yet */
 598 #define   CIFSSEC_MAY_NTLMSSP   0x00080 /* raw ntlmssp with ntlmv2 */
 599
 600 #define   CIFSSEC_MUST_SIGN     0x01001
 601 /* note that only one of the following can be set so the
 602 result of setting MUST flags more than once will be to
 603 require use of the stronger protocol */
 604 #define   CIFSSEC_MUST_NTLM     0x02002
 605 #define   CIFSSEC_MUST_NTLMV2   0x04004
 606 #define   CIFSSEC_MUST_KRB5     0x08008
 607 #ifdef CONFIG_CIFS_WEAK_PW_HASH
 608 #define   CIFSSEC_MUST_LANMAN   0x10010
 609 #define   CIFSSEC_MUST_PLNTXT   0x20020
 610 #ifdef CONFIG_CIFS_UPCALL
 611 #define   CIFSSEC_MASK          0xBF0BF /* allows weak security but also krb5 */
 612 #else
 613 #define   CIFSSEC_MASK          0xB70B7 /* current flags supported if weak */
 614 #endif /* UPCALL */
 615 #else /* do not allow weak pw hash */
 616 #ifdef CONFIG_CIFS_UPCALL
 617 #define   CIFSSEC_MASK          0x8F08F /* flags supported if no weak allowed */
 618 #else
 619 #define   CIFSSEC_MASK          0x87087 /* flags supported if no weak allowed */
 620 #endif /* UPCALL */
 621 #endif /* WEAK_PW_HASH */
 622 #define   CIFSSEC_MUST_SEAL     0x40040 /* not supported yet */
 623 #define   CIFSSEC_MUST_NTLMSSP  0x80080 /* raw ntlmssp with ntlmv2 */
 624
 625 #define   CIFSSEC_DEF (CIFSSEC_MAY_SIGN | CIFSSEC_MAY_NTLM | CIFSSEC_MAY_NTLMV2)
 626 #define   CIFSSEC_MAX (CIFSSEC_MUST_SIGN | CIFSSEC_MUST_NTLMV2)
 627 #define   CIFSSEC_AUTH_MASK (CIFSSEC_MAY_NTLM | CIFSSEC_MAY_NTLMV2 | CIFSSEC_MAY_LANMAN | CIFSSEC_MAY_PLNTXT | CIFSSEC_MAY_KRB5 | CIFSSEC_MAY_NTLMSSP)
 628 /*
 629  *****************************************************************
 630  * All constants go here
 631  *****************************************************************
 632  */
 633
 634 #define UID_HASH (16)
 635
 636 /*
 637  * Note that ONE module should define _DECLARE_GLOBALS_HERE to cause the
 638  * following to be declared.
 639  */
 640
 641 /****************************************************************************
 642  *  Locking notes.  All updates to global variables and lists should be
 643  *                  protected by spinlocks or semaphores.
 644  *
 645  *  Spinlocks
 646  *  ---------
 647  *  GlobalMid_Lock protects:
 648  *      list operations on pending_mid_q and oplockQ
 649  *      updates to XID counters, multiplex id  and SMB sequence numbers
 650  *  GlobalSMBSesLock protects:
 651  *      list operations on tcp and SMB session lists and tCon lists
 652  *  f_owner.lock protects certain per file struct operations
 653  *  mapping->page_lock protects certain per page operations
 654  *
 655  *  Semaphores
 656  *  ----------
 657  *  sesSem     operations on smb session
 658  *  tconSem    operations on tree connection
 659  *  fh_sem      file handle reconnection operations
 660  *
 661  ****************************************************************************/
 662
 663 #ifdef DECLARE_GLOBALS_HERE
 664 #define GLOBAL_EXTERN
 665 #else
 666 #define GLOBAL_EXTERN extern
 667 #endif
 668
 669 /*
 670  * the list of TCP_Server_Info structures, ie each of the sockets
 671  * connecting our client to a distinct server (ip address), is
 672  * chained together by cifs_tcp_ses_list. The list of all our SMB
 673  * sessions (and from that the tree connections) can be found
 674  * by iterating over cifs_tcp_ses_list
 675  */
 676 GLOBAL_EXTERN struct list_head          cifs_tcp_ses_list;
 677
 678 /*
 679  * This lock protects the cifs_tcp_ses_list, the list of smb sessions per
 680  * tcp session, and the list of tcon's per smb session. It also protects
 681  * the reference counters for the server, smb session, and tcon. Finally,
 682  * changes to the tcon->tidStatus should be done while holding this lock.
 683  */
 684 GLOBAL_EXTERN rwlock_t          cifs_tcp_ses_lock;
 685
 686 /*
 687  * This lock protects the cifs_file->llist and cifs_file->flist
 688  * list operations, and updates to some flags (cifs_file->invalidHandle)
 689  * It will be moved to either use the tcon->stat_lock or equivalent later.
 690  * If cifs_tcp_ses_lock and the lock below are both needed to be held, then
 691  * the cifs_tcp_ses_lock must be grabbed first and released last.
 692  */
 693 GLOBAL_EXTERN rwlock_t GlobalSMBSeslock;
 694
 695 /* Outstanding dir notify requests */
 696 GLOBAL_EXTERN struct list_head GlobalDnotifyReqList;
 697 /* DirNotify response queue */
 698 GLOBAL_EXTERN struct list_head GlobalDnotifyRsp_Q;
 699
 700 /*
 701  * Global transaction id (XID) information
 702  */
 703 GLOBAL_EXTERN unsigned int GlobalCurrentXid;    /* protected by GlobalMid_Sem */
 704 GLOBAL_EXTERN unsigned int GlobalTotalActiveXid; /* prot by GlobalMid_Sem */
 705 GLOBAL_EXTERN unsigned int GlobalMaxActiveXid;  /* prot by GlobalMid_Sem */
 706 GLOBAL_EXTERN spinlock_t GlobalMid_Lock;  /* protects above & list operations */
 707                                           /* on midQ entries */
 708 GLOBAL_EXTERN char Local_System_Name[15];
 709
 710 /*
 711  *  Global counters, updated atomically
 712  */
 713 GLOBAL_EXTERN atomic_t sesInfoAllocCount;
 714 GLOBAL_EXTERN atomic_t tconInfoAllocCount;
 715 GLOBAL_EXTERN atomic_t tcpSesAllocCount;
 716 GLOBAL_EXTERN atomic_t tcpSesReconnectCount;
 717 GLOBAL_EXTERN atomic_t tconInfoReconnectCount;
 718
 719 /* Various Debug counters */
 720 GLOBAL_EXTERN atomic_t bufAllocCount;    /* current number allocated  */
 721 #ifdef CONFIG_CIFS_STATS2
 722 GLOBAL_EXTERN atomic_t totBufAllocCount; /* total allocated over all time */
 723 GLOBAL_EXTERN atomic_t totSmBufAllocCount;
 724 #endif
 725 GLOBAL_EXTERN atomic_t smBufAllocCount;
 726 GLOBAL_EXTERN atomic_t midCount;
 727
 728 /* Misc globals */
 729 GLOBAL_EXTERN unsigned int multiuser_mount; /* if enabled allows new sessions
 730                                 to be established on existing mount if we
 731                                 have the uid/password or Kerberos credential
 732                                 or equivalent for current user */
 733 GLOBAL_EXTERN unsigned int oplockEnabled;
 734 GLOBAL_EXTERN unsigned int experimEnabled;
 735 GLOBAL_EXTERN unsigned int lookupCacheEnabled;
 736 GLOBAL_EXTERN unsigned int global_secflags;     /* if on, session setup sent
 737                                 with more secure ntlmssp2 challenge/resp */
 738 GLOBAL_EXTERN unsigned int sign_CIFS_PDUs;  /* enable smb packet signing */
 739 GLOBAL_EXTERN unsigned int linuxExtEnabled;/*enable Linux/Unix CIFS extensions*/
 740 GLOBAL_EXTERN unsigned int CIFSMaxBufSize;  /* max size not including hdr */
 741 GLOBAL_EXTERN unsigned int cifs_min_rcv;    /* min size of big ntwrk buf pool */
 742 GLOBAL_EXTERN unsigned int cifs_min_small;  /* min size of small buf pool */
 743 GLOBAL_EXTERN unsigned int cifs_max_pending; /* MAX requests at once to server*/
 744
 745 void cifs_oplock_break(struct work_struct *work);
 746 void cifs_oplock_break_get(struct cifsFileInfo *cfile);
 747 void cifs_oplock_break_put(struct cifsFileInfo *cfile);
 748
 749 extern const struct slow_work_ops cifs_oplock_break_ops;
 750
 751 #endif  /* _CIFS_GLOB_H */