fs/cifs/cifsglob.h

   1 /*
   2  *   fs/cifs/cifsglob.h
   3  *
   4  *   Copyright (C) International Business Machines  Corp., 2002,2005
   5  *   Author(s): Steve French (sfrench@us.ibm.com)
   6  *
   7  *   This library is free software; you can redistribute it and/or modify
   8  *   it under the terms of the GNU Lesser General Public License as published
   9  *   by the Free Software Foundation; either version 2.1 of the License, or
  10  *   (at your option) any later version.
  11  *
  12  *   This library is distributed in the hope that it will be useful,
  13  *   but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See
  15  *   the GNU Lesser General Public License for more details.
  16  *
  17  */
  18 #include <linux/in.h>
  19 #include <linux/in6.h>
  20 #include "cifs_fs_sb.h"
  21 /*
  22  * The sizes of various internal tables and strings
  23  */
  24 #define MAX_UID_INFO 16
  25 #define MAX_SES_INFO 2
  26 #define MAX_TCON_INFO 4
  27
  28 #define MAX_TREE_SIZE 2 + MAX_SERVER_SIZE + 1 + MAX_SHARE_SIZE + 1
  29 #define MAX_SERVER_SIZE 15
  30 #define MAX_SHARE_SIZE  64      /* used to be 20 - this should still be enough */
  31 #define MAX_USERNAME_SIZE 32    /* 32 is to allow for 15 char names + null
  32                                    termination then *2 for unicode versions */
  33 #define MAX_PASSWORD_SIZE 16
  34
  35 #define CIFS_MIN_RCV_POOL 4
  36
  37 /*
  38  * MAX_REQ is the maximum number of requests that WE will send
  39  * on one socket concurently. It also matches the most common
  40  * value of max multiplex returned by servers.  We may
  41  * eventually want to use the negotiated value (in case
  42  * future servers can handle more) when we are more confident that
  43  * we will not have problems oveloading the socket with pending
  44  * write data.
  45  */
  46 #define CIFS_MAX_REQ 50
  47
  48 #define SERVER_NAME_LENGTH 15
  49 #define SERVER_NAME_LEN_WITH_NULL     (SERVER_NAME_LENGTH + 1)
  50
  51 /* used to define string lengths for reversing unicode strings */
  52 /*         (256+1)*2 = 514                                     */
  53 /*           (max path length + 1 for null) * 2 for unicode    */
  54 #define MAX_NAME 514
  55
  56 #include "cifspdu.h"
  57
  58 #ifndef FALSE
  59 #define FALSE 0
  60 #endif
  61
  62 #ifndef TRUE
  63 #define TRUE 1
  64 #endif
  65
  66 #ifndef XATTR_DOS_ATTRIB
  67 #define XATTR_DOS_ATTRIB "user.DOSATTRIB"
  68 #endif
  69
  70 /*
  71  * This information is kept on every Server we know about.
  72  *
  73  * Some things to note:
  74  *
  75  */
  76 #define SERVER_NAME_LEN_WITH_NULL       (SERVER_NAME_LENGTH + 1)
  77
  78 /*
  79  * CIFS vfs client Status information (based on what we know.)
  80  */
  81
  82  /* associated with each tcp and smb session */
  83 enum statusEnum {
  84         CifsNew = 0,
  85         CifsGood,
  86         CifsExiting,
  87         CifsNeedReconnect
  88 };
  89
  90 enum securityEnum {
  91         NTLM = 0,               /* Legacy NTLM012 auth with NTLM hash */
  92         NTLMv2,                 /* Legacy NTLM auth with NTLMv2 hash */
  93         RawNTLMSSP,             /* NTLMSSP without SPNEGO */
  94         NTLMSSP,                /* NTLMSSP via SPNEGO */
  95         Kerberos                /* Kerberos via SPNEGO */
  96 };
  97
  98 enum protocolEnum {
  99         IPV4 = 0,
 100         IPV6,
 101         SCTP
 102         /* Netbios frames protocol not supported at this time */
 103 };
 104
 105 /*
 106  *****************************************************************
 107  * Except the CIFS PDUs themselves all the
 108  * globally interesting structs should go here
 109  *****************************************************************
 110  */
 111
 112 struct TCP_Server_Info {
 113         char server_Name[SERVER_NAME_LEN_WITH_NULL];    /* 15 chars + X'20'in 16th */
 114         char unicode_server_Name[SERVER_NAME_LEN_WITH_NULL * 2];        /* Unicode version of server_Name */
 115         struct socket *ssocket;
 116         union {
 117                 struct sockaddr_in sockAddr;
 118                 struct sockaddr_in6 sockAddr6;
 119         } addr;
 120         wait_queue_head_t response_q;
 121         wait_queue_head_t request_q; /* if more than maxmpx to srvr must block*/
 122         struct list_head pending_mid_q;
 123         void *Server_NlsInfo;   /* BB - placeholder for future NLS info  */
 124         unsigned short server_codepage; /* codepage for the server    */
 125         unsigned long ip_address;       /* IP addr for the server if known     */
 126         enum protocolEnum protocolType;
 127         char versionMajor;
 128         char versionMinor;
 129         unsigned svlocal:1;     /* local server or remote */
 130         atomic_t socketUseCount; /* number of open cifs sessions on socket */
 131         atomic_t inFlight;  /* number of requests on the wire to server */
 132         enum statusEnum tcpStatus; /* what we think the status is */
 133         struct semaphore tcpSem;
 134         struct task_struct *tsk;
 135         char server_GUID[16];
 136         char secMode;
 137         enum securityEnum secType;
 138         unsigned int maxReq;    /* Clients should submit no more */
 139         /* than maxReq distinct unanswered SMBs to the server when using  */
 140         /* multiplexed reads or writes */
 141         unsigned int maxBuf;    /* maxBuf specifies the maximum */
 142         /* message size the server can send or receive for non-raw SMBs */
 143         unsigned int maxRw;     /* maxRw specifies the maximum */
 144         /* message size the server can send or receive for */
 145         /* SMB_COM_WRITE_RAW or SMB_COM_READ_RAW. */
 146         char sessid[4];         /* unique token id for this session */
 147         /* (returned on Negotiate */
 148         int capabilities; /* allow selective disabling of caps by smb sess */
 149         __u16 timeZone;
 150         char cryptKey[CIFS_CRYPTO_KEY_SIZE];
 151         char workstation_RFC1001_name[16]; /* 16th byte is always zero */
 152         __u32 sequence_number; /* needed for CIFS PDU signature */
 153         char mac_signing_key[CIFS_SESSION_KEY_SIZE + 16];
 154 };
 155
 156 /*
 157  * The following is our shortcut to user information.  We surface the uid,
 158  * and name. We always get the password on the fly in case it
 159  * has changed. We also hang a list of sessions owned by this user off here.
 160  */
 161 struct cifsUidInfo {
 162         struct list_head userList;
 163         struct list_head sessionList; /* SMB sessions for this user */
 164         uid_t linux_uid;
 165         char user[MAX_USERNAME_SIZE + 1];       /* ascii name of user */
 166         /* BB may need ptr or callback for PAM or WinBind info */
 167 };
 168
 169 /*
 170  * Session structure.  One of these for each uid session with a particular host
 171  */
 172 struct cifsSesInfo {
 173         struct list_head cifsSessionList;
 174         struct semaphore sesSem;
 175         struct cifsUidInfo *uidInfo;    /* pointer to user info */
 176         struct TCP_Server_Info *server; /* pointer to server info */
 177         atomic_t inUse; /* # of mounts (tree connections) on this ses */
 178         enum statusEnum status;
 179         __u16 ipc_tid;          /* special tid for connection to IPC share */
 180         __u16 flags;
 181         char *serverOS;         /* name of operating system underlying server */
 182         char *serverNOS;        /* name of network operating system of server */
 183         char *serverDomain;     /* security realm of server */
 184         int Suid;               /* remote smb uid  */
 185         uid_t linux_uid;        /* local Linux uid */
 186         int capabilities;
 187         char serverName[SERVER_NAME_LEN_WITH_NULL * 2]; /* BB make bigger for
 188                                 TCP names - will ipv6 and sctp addresses fit? */
 189         char userName[MAX_USERNAME_SIZE + 1];
 190         char domainName[MAX_USERNAME_SIZE + 1];
 191         char * password;
 192 };
 193 /* session flags */
 194 #define CIFS_SES_NT4 1
 195
 196 /*
 197  * there is one of these for each connection to a resource on a particular
 198  * session
 199  */
 200 struct cifsTconInfo {
 201         struct list_head cifsConnectionList;
 202         struct list_head openFileList;
 203         struct semaphore tconSem;
 204         struct cifsSesInfo *ses;        /* pointer to session associated with */
 205         char treeName[MAX_TREE_SIZE + 1]; /* UNC name of resource (in ASCII not UTF) */
 206         char *nativeFileSystem;
 207         __u16 tid;              /* The 2 byte tree id */
 208         __u16 Flags;            /* optional support bits */
 209         enum statusEnum tidStatus;
 210         atomic_t useCount;      /* how many mounts (explicit or implicit) to this share */
 211 #ifdef CONFIG_CIFS_STATS
 212         atomic_t num_smbs_sent;
 213         atomic_t num_writes;
 214         atomic_t num_reads;
 215         atomic_t num_oplock_brks;
 216         atomic_t num_opens;
 217         atomic_t num_deletes;
 218         atomic_t num_mkdirs;
 219         atomic_t num_rmdirs;
 220         atomic_t num_renames;
 221         atomic_t num_t2renames;
 222         __u64    bytes_read;
 223         __u64    bytes_written;
 224         spinlock_t stat_lock;
 225 #endif
 226         FILE_SYSTEM_DEVICE_INFO fsDevInfo;
 227         FILE_SYSTEM_ATTRIBUTE_INFO fsAttrInfo;  /* ok if file system name truncated */
 228         FILE_SYSTEM_UNIX_INFO fsUnixInfo;
 229         unsigned retry:1;
 230         /* BB add field for back pointer to sb struct? */
 231 };
 232
 233 /*
 234  * This info hangs off the cifsFileInfo structure.  This is used to track
 235  * byte stream locks on the file
 236  */
 237 struct cifsLockInfo {
 238         struct cifsLockInfo *next;
 239         int start;
 240         int length;
 241         int type;
 242 };
 243
 244 /*
 245  * One of these for each open instance of a file
 246  */
 247 struct cifs_search_info {
 248         loff_t index_of_last_entry;
 249         __u16 entries_in_buffer;
 250         __u16 info_level;
 251         __u32 resume_key;
 252         char * ntwrk_buf_start;
 253         char * srch_entries_start;
 254         char * presume_name;
 255         unsigned int resume_name_len;
 256         unsigned endOfSearch:1;
 257         unsigned emptyDir:1;
 258         unsigned unicode:1;
 259 };
 260
 261 struct cifsFileInfo {
 262         struct list_head tlist; /* pointer to next fid owned by tcon */
 263         struct list_head flist; /* next fid (file instance) for this inode */
 264         unsigned int uid;       /* allows finding which FileInfo structure */
 265         __u32 pid;              /* process id who opened file */
 266         __u16 netfid;           /* file id from remote */
 267         /* BB add lock scope info here if needed */ ;
 268         /* lock scope id (0 if none) */
 269         struct file * pfile; /* needed for writepage */
 270         struct inode * pInode; /* needed for oplock break */
 271         unsigned closePend:1;   /* file is marked to close */
 272         unsigned invalidHandle:1;  /* file closed via session abend */
 273         struct semaphore fh_sem; /* prevents reopen race after dead ses*/
 274         char * search_resume_name; /* BB removeme BB */
 275         unsigned int resume_name_length; /* BB removeme - field renamed and moved BB */
 276         struct cifs_search_info srch_inf;
 277 };
 278
 279 /*
 280  * One of these for each file inode
 281  */
 282
 283 struct cifsInodeInfo {
 284         struct list_head lockList;
 285         /* BB add in lists for dirty pages - i.e. write caching info for oplock */
 286         struct list_head openFileList;
 287         int write_behind_rc;
 288         __u32 cifsAttrs; /* e.g. DOS archive bit, sparse, compressed, system */
 289         atomic_t inUse;  /* num concurrent users (local openers cifs) of file*/
 290         unsigned long time;     /* jiffies of last update/check of inode */
 291         unsigned clientCanCacheRead:1; /* read oplock */
 292         unsigned clientCanCacheAll:1;  /* read and writebehind oplock */
 293         unsigned oplockPending:1;
 294         struct inode vfs_inode;
 295 };
 296
 297 static inline struct cifsInodeInfo *
 298 CIFS_I(struct inode *inode)
 299 {
 300         return container_of(inode, struct cifsInodeInfo, vfs_inode);
 301 }
 302
 303 static inline struct cifs_sb_info *
 304 CIFS_SB(struct super_block *sb)
 305 {
 306         return sb->s_fs_info;
 307 }
 308
 309
 310 /* one of these for every pending CIFS request to the server */
 311 struct mid_q_entry {
 312         struct list_head qhead; /* mids waiting on reply from this server */
 313         __u16 mid;              /* multiplex id */
 314         __u16 pid;              /* process id */
 315         __u32 sequence_number;  /* for CIFS signing */
 316         struct timeval when_sent;       /* time when smb sent */
 317         struct cifsSesInfo *ses;        /* smb was sent to this server */
 318         struct task_struct *tsk;        /* task waiting for response */
 319         struct smb_hdr *resp_buf;       /* response buffer */
 320         int midState;   /* wish this were enum but can not pass to wait_event */
 321         __u8 command;   /* smb command code */
 322         unsigned multiPart:1;   /* multiple responses to one SMB request */
 323         unsigned largeBuf:1;    /* if valid response, is pointer to large buf */
 324         unsigned multiResp:1;   /* multiple trans2 responses for one request  */
 325 };
 326
 327 struct oplock_q_entry {
 328         struct list_head qhead;
 329         struct inode * pinode;
 330         struct cifsTconInfo * tcon;
 331         __u16 netfid;
 332 };
 333
 334 #define   MID_FREE 0
 335 #define   MID_REQUEST_ALLOCATED 1
 336 #define   MID_REQUEST_SUBMITTED 2
 337 #define   MID_RESPONSE_RECEIVED 4
 338 #define   MID_RETRY_NEEDED      8 /* session closed while this request out */
 339 #define   MID_NO_RESP_NEEDED 0x10
 340 #define   MID_SMALL_BUFFER   0x20 /* 112 byte response buffer instead of 4K */
 341
 342 /*
 343  *****************************************************************
 344  * All constants go here
 345  *****************************************************************
 346  */
 347
 348 #define UID_HASH (16)
 349
 350 /*
 351  * Note that ONE module should define _DECLARE_GLOBALS_HERE to cause the
 352  * following to be declared.
 353  */
 354
 355 /****************************************************************************
 356  *  Locking notes.  All updates to global variables and lists should be
 357  *                  protected by spinlocks or semaphores.
 358  *
 359  *  Spinlocks
 360  *  ---------
 361  *  GlobalMid_Lock protects:
 362  *      list operations on pending_mid_q and oplockQ
 363  *      updates to XID counters, multiplex id  and SMB sequence numbers
 364  *  GlobalSMBSesLock protects:
 365  *      list operations on tcp and SMB session lists and tCon lists
 366  *  f_owner.lock protects certain per file struct operations
 367  *  mapping->page_lock protects certain per page operations
 368  *
 369  *  Semaphores
 370  *  ----------
 371  *  sesSem     operations on smb session
 372  *  tconSem    operations on tree connection
 373  *  fh_sem      file handle reconnection operations
 374  *
 375  ****************************************************************************/
 376
 377 #ifdef DECLARE_GLOBALS_HERE
 378 #define GLOBAL_EXTERN
 379 #else
 380 #define GLOBAL_EXTERN extern
 381 #endif
 382
 383 /*
 384  * The list of servers that did not respond with NT LM 0.12.
 385  * This list helps improve performance and eliminate the messages indicating
 386  * that we had a communications error talking to the server in this list.
 387  */
 388 GLOBAL_EXTERN struct servers_not_supported *NotSuppList;        /*@z4a */
 389
 390 /*
 391  * The following is a hash table of all the users we know about.
 392  */
 393 GLOBAL_EXTERN struct smbUidInfo *GlobalUidList[UID_HASH];
 394
 395 GLOBAL_EXTERN struct list_head GlobalServerList; /* BB not implemented yet */
 396 GLOBAL_EXTERN struct list_head GlobalSMBSessionList;
 397 GLOBAL_EXTERN struct list_head GlobalTreeConnectionList;
 398 GLOBAL_EXTERN rwlock_t GlobalSMBSeslock;  /* protects list inserts on 3 above */
 399
 400 GLOBAL_EXTERN struct list_head GlobalOplock_Q;
 401
 402 /*
 403  * Global transaction id (XID) information
 404  */
 405 GLOBAL_EXTERN unsigned int GlobalCurrentXid;    /* protected by GlobalMid_Sem */
 406 GLOBAL_EXTERN unsigned int GlobalTotalActiveXid;        /* prot by GlobalMid_Sem */
 407 GLOBAL_EXTERN unsigned int GlobalMaxActiveXid;  /* prot by GlobalMid_Sem */
 408 GLOBAL_EXTERN spinlock_t GlobalMid_Lock;  /* protects above and list operations */
 409                                         /* on midQ entries */
 410 GLOBAL_EXTERN char Local_System_Name[15];
 411
 412 /*
 413  *  Global counters, updated atomically
 414  */
 415 GLOBAL_EXTERN atomic_t sesInfoAllocCount;
 416 GLOBAL_EXTERN atomic_t tconInfoAllocCount;
 417 GLOBAL_EXTERN atomic_t tcpSesAllocCount;
 418 GLOBAL_EXTERN atomic_t tcpSesReconnectCount;
 419 GLOBAL_EXTERN atomic_t tconInfoReconnectCount;
 420
 421 /* Various Debug counters to remove someday (BB) */
 422 GLOBAL_EXTERN atomic_t bufAllocCount;
 423 GLOBAL_EXTERN atomic_t smBufAllocCount;
 424 GLOBAL_EXTERN atomic_t midCount;
 425
 426 /* Misc globals */
 427 GLOBAL_EXTERN unsigned int multiuser_mount;     /* if enabled allows new sessions
 428                                 to be established on existing mount if we
 429                                 have the uid/password or Kerberos credential
 430                                 or equivalent for current user */
 431 GLOBAL_EXTERN unsigned int oplockEnabled;
 432 GLOBAL_EXTERN unsigned int experimEnabled;
 433 GLOBAL_EXTERN unsigned int lookupCacheEnabled;
 434 GLOBAL_EXTERN unsigned int extended_security;   /* if on, session setup sent
 435                                 with more secure ntlmssp2 challenge/resp */
 436 GLOBAL_EXTERN unsigned int ntlmv2_support;  /* better optional password hash */
 437 GLOBAL_EXTERN unsigned int sign_CIFS_PDUs;  /* enable smb packet signing */
 438 GLOBAL_EXTERN unsigned int linuxExtEnabled;/*enable Linux/Unix CIFS extensions*/
 439 GLOBAL_EXTERN unsigned int CIFSMaxBufSize;  /* max size not including hdr */
 440 GLOBAL_EXTERN unsigned int cifs_min_rcv;    /* min size of big ntwrk buf pool */
 441 GLOBAL_EXTERN unsigned int cifs_min_small;  /* min size of small buf pool */
 442 GLOBAL_EXTERN unsigned int cifs_max_pending; /* MAX requests at once to server*/
 443