[CRYPTO]: White space and coding style clean up in tcrypt

[linux-2.6.22.y-op.git] / fs / cifs / cifsglob.h

/*
 *   fs/cifs/cifsglob.h
 *
 *   Copyright (C) International Business Machines  Corp., 2002,2005
 *   Author(s): Steve French (sfrench@us.ibm.com)
 *
 *   This library is free software; you can redistribute it and/or modify
 *   it under the terms of the GNU Lesser General Public License as published
 *   by the Free Software Foundation; either version 2.1 of the License, or
 *   (at your option) any later version.
 *
 *   This library is distributed in the hope that it will be useful,
 *   but WITHOUT ANY WARRANTY; without even the implied warranty of
 *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See
 *   the GNU Lesser General Public License for more details.
 * 
 */
#include <linux/in.h>
#include <linux/in6.h>
#include "cifs_fs_sb.h"
/*
 * The sizes of various internal tables and strings
 */
#define MAX_UID_INFO 16
#define MAX_SES_INFO 2
#define MAX_TCON_INFO 4

#define MAX_TREE_SIZE 2 + MAX_SERVER_SIZE + 1 + MAX_SHARE_SIZE + 1
#define MAX_SERVER_SIZE 15
#define MAX_SHARE_SIZE  64      /* used to be 20 - this should still be enough */
#define MAX_USERNAME_SIZE 32    /* 32 is to allow for 15 char names + null
                                   termination then *2 for unicode versions */
#define MAX_PASSWORD_SIZE 16

#define CIFS_MIN_RCV_POOL 4

/*
 * MAX_REQ is the maximum number of requests that WE will send
 * on one socket concurently. It also matches the most common
 * value of max multiplex returned by servers.  We may 
 * eventually want to use the negotiated value (in case
 * future servers can handle more) when we are more confident that
 * we will not have problems oveloading the socket with pending
 * write data.
 */
#define CIFS_MAX_REQ 50 

#define SERVER_NAME_LENGTH 15
#define SERVER_NAME_LEN_WITH_NULL     (SERVER_NAME_LENGTH + 1)

/* used to define string lengths for reversing unicode strings */
/*         (256+1)*2 = 514                                     */
/*           (max path length + 1 for null) * 2 for unicode    */
#define MAX_NAME 514

#include "cifspdu.h"

#ifndef FALSE
#define FALSE 0
#endif

#ifndef TRUE
#define TRUE 1
#endif

#ifndef XATTR_DOS_ATTRIB
#define XATTR_DOS_ATTRIB "user.DOSATTRIB"
#endif

/*
 * This information is kept on every Server we know about.
 *
 * Some things to note:
 *
 */
#define SERVER_NAME_LEN_WITH_NULL       (SERVER_NAME_LENGTH + 1)

/*
 * CIFS vfs client Status information (based on what we know.)
 */

 /* associated with each tcp and smb session */
enum statusEnum {
        CifsNew = 0,
        CifsGood,
        CifsExiting,
        CifsNeedReconnect
};

enum securityEnum {
        NTLM = 0,               /* Legacy NTLM012 auth with NTLM hash */
        NTLMv2,                 /* Legacy NTLM auth with NTLMv2 hash */
        RawNTLMSSP,             /* NTLMSSP without SPNEGO */
        NTLMSSP,                /* NTLMSSP via SPNEGO */
        Kerberos                /* Kerberos via SPNEGO */
};

enum protocolEnum {
        IPV4 = 0,
        IPV6,
        SCTP
        /* Netbios frames protocol not supported at this time */
};

/*
 *****************************************************************
 * Except the CIFS PDUs themselves all the
 * globally interesting structs should go here
 *****************************************************************
 */

struct TCP_Server_Info {
        char server_Name[SERVER_NAME_LEN_WITH_NULL];    /* 15 chars + X'20'in 16th */
        char unicode_server_Name[SERVER_NAME_LEN_WITH_NULL * 2];        /* Unicode version of server_Name */
        struct socket *ssocket;
        union {
                struct sockaddr_in sockAddr;
                struct sockaddr_in6 sockAddr6;
        } addr;
        wait_queue_head_t response_q; 
        wait_queue_head_t request_q; /* if more than maxmpx to srvr must block*/
        struct list_head pending_mid_q;
        void *Server_NlsInfo;   /* BB - placeholder for future NLS info  */
        unsigned short server_codepage; /* codepage for the server    */
        unsigned long ip_address;       /* IP addr for the server if known     */
        enum protocolEnum protocolType; 
        char versionMajor;
        char versionMinor;
        unsigned svlocal:1;     /* local server or remote */
        atomic_t socketUseCount; /* number of open cifs sessions on socket */
        atomic_t inFlight;  /* number of requests on the wire to server */
        enum statusEnum tcpStatus; /* what we think the status is */
        struct semaphore tcpSem;
        struct task_struct *tsk;
        char server_GUID[16];
        char secMode;
        enum securityEnum secType;
        unsigned int maxReq;    /* Clients should submit no more */
        /* than maxReq distinct unanswered SMBs to the server when using  */
        /* multiplexed reads or writes */
        unsigned int maxBuf;    /* maxBuf specifies the maximum */
        /* message size the server can send or receive for non-raw SMBs */
        unsigned int maxRw;     /* maxRw specifies the maximum */
        /* message size the server can send or receive for */
        /* SMB_COM_WRITE_RAW or SMB_COM_READ_RAW. */
        char sessid[4];         /* unique token id for this session */
        /* (returned on Negotiate */
        int capabilities; /* allow selective disabling of caps by smb sess */
        __u16 timeZone;
        char cryptKey[CIFS_CRYPTO_KEY_SIZE];
        char workstation_RFC1001_name[16]; /* 16th byte is always zero */
        __u32 sequence_number; /* needed for CIFS PDU signature */
        char mac_signing_key[CIFS_SESSION_KEY_SIZE + 16]; 
};

/*
 * The following is our shortcut to user information.  We surface the uid,
 * and name. We always get the password on the fly in case it
 * has changed. We also hang a list of sessions owned by this user off here. 
 */
struct cifsUidInfo {
        struct list_head userList;
        struct list_head sessionList; /* SMB sessions for this user */
        uid_t linux_uid;
        char user[MAX_USERNAME_SIZE + 1];       /* ascii name of user */
        /* BB may need ptr or callback for PAM or WinBind info */
};

/*
 * Session structure.  One of these for each uid session with a particular host
 */
struct cifsSesInfo {
        struct list_head cifsSessionList;
        struct semaphore sesSem;
        struct cifsUidInfo *uidInfo;    /* pointer to user info */
        struct TCP_Server_Info *server; /* pointer to server info */
        atomic_t inUse; /* # of mounts (tree connections) on this ses */
        enum statusEnum status;
        __u16 ipc_tid;          /* special tid for connection to IPC share */
        __u16 flags;
        char *serverOS;         /* name of operating system underlying server */
        char *serverNOS;        /* name of network operating system of server */
        char *serverDomain;     /* security realm of server */
        int Suid;               /* remote smb uid  */
        uid_t linux_uid;        /* local Linux uid */
        int capabilities;
        char serverName[SERVER_NAME_LEN_WITH_NULL * 2]; /* BB make bigger for 
                                TCP names - will ipv6 and sctp addresses fit? */
        char userName[MAX_USERNAME_SIZE + 1];
        char domainName[MAX_USERNAME_SIZE + 1];
        char * password;
};
/* session flags */
#define CIFS_SES_NT4 1

/*
 * there is one of these for each connection to a resource on a particular
 * session 
 */
struct cifsTconInfo {
        struct list_head cifsConnectionList;
        struct list_head openFileList;
        struct semaphore tconSem;
        struct cifsSesInfo *ses;        /* pointer to session associated with */
        char treeName[MAX_TREE_SIZE + 1]; /* UNC name of resource (in ASCII not UTF) */
        char *nativeFileSystem;
        __u16 tid;              /* The 2 byte tree id */
        __u16 Flags;            /* optional support bits */
        enum statusEnum tidStatus;
        atomic_t useCount;      /* how many mounts (explicit or implicit) to this share */
#ifdef CONFIG_CIFS_STATS
        atomic_t num_smbs_sent;
        atomic_t num_writes;
        atomic_t num_reads;
        atomic_t num_oplock_brks;
        atomic_t num_opens;
        atomic_t num_deletes;
        atomic_t num_mkdirs;
        atomic_t num_rmdirs;
        atomic_t num_renames;
        atomic_t num_t2renames;
        __u64    bytes_read;
        __u64    bytes_written;
        spinlock_t stat_lock;
#endif
        FILE_SYSTEM_DEVICE_INFO fsDevInfo;
        FILE_SYSTEM_ATTRIBUTE_INFO fsAttrInfo;  /* ok if file system name truncated */
        FILE_SYSTEM_UNIX_INFO fsUnixInfo;
        unsigned retry:1;
        /* BB add field for back pointer to sb struct? */
};

/*
 * This info hangs off the cifsFileInfo structure.  This is used to track
 * byte stream locks on the file
 */
struct cifsLockInfo {
        struct cifsLockInfo *next;
        int start;
        int length;
        int type;
};

/*
 * One of these for each open instance of a file
 */
struct cifs_search_info {
        loff_t index_of_last_entry;
        __u16 entries_in_buffer;
        __u16 info_level;
        __u32 resume_key;
        char * ntwrk_buf_start;
        char * srch_entries_start;
        char * presume_name;
        unsigned int resume_name_len;
        unsigned endOfSearch:1;
        unsigned emptyDir:1;
        unsigned unicode:1;
};

struct cifsFileInfo {
        struct list_head tlist; /* pointer to next fid owned by tcon */
        struct list_head flist; /* next fid (file instance) for this inode */
        unsigned int uid;       /* allows finding which FileInfo structure */
        __u32 pid;              /* process id who opened file */
        __u16 netfid;           /* file id from remote */
        /* BB add lock scope info here if needed */ ;
        /* lock scope id (0 if none) */
        struct file * pfile; /* needed for writepage */
        struct inode * pInode; /* needed for oplock break */
        unsigned closePend:1;   /* file is marked to close */
        unsigned invalidHandle:1;  /* file closed via session abend */
        struct semaphore fh_sem; /* prevents reopen race after dead ses*/
        char * search_resume_name; /* BB removeme BB */
        unsigned int resume_name_length; /* BB removeme - field renamed and moved BB */
        struct cifs_search_info srch_inf;
};

/*
 * One of these for each file inode
 */

struct cifsInodeInfo {
        struct list_head lockList;
        /* BB add in lists for dirty pages - i.e. write caching info for oplock */
        struct list_head openFileList;
        int write_behind_rc;
        __u32 cifsAttrs; /* e.g. DOS archive bit, sparse, compressed, system */
        atomic_t inUse;  /* num concurrent users (local openers cifs) of file*/
        unsigned long time;     /* jiffies of last update/check of inode */
        unsigned clientCanCacheRead:1; /* read oplock */
        unsigned clientCanCacheAll:1;  /* read and writebehind oplock */
        unsigned oplockPending:1;
        struct inode vfs_inode;
};

static inline struct cifsInodeInfo *
CIFS_I(struct inode *inode)
{
        return container_of(inode, struct cifsInodeInfo, vfs_inode);
}

static inline struct cifs_sb_info *
CIFS_SB(struct super_block *sb)
{
        return sb->s_fs_info;
}


/* one of these for every pending CIFS request to the server */
struct mid_q_entry {
        struct list_head qhead; /* mids waiting on reply from this server */
        __u16 mid;              /* multiplex id */
        __u16 pid;              /* process id */
        __u32 sequence_number;  /* for CIFS signing */
        struct timeval when_sent;       /* time when smb sent */
        struct cifsSesInfo *ses;        /* smb was sent to this server */
        struct task_struct *tsk;        /* task waiting for response */
        struct smb_hdr *resp_buf;       /* response buffer */
        int midState;   /* wish this were enum but can not pass to wait_event */
        __u8 command;   /* smb command code */
        unsigned multiPart:1;   /* multiple responses to one SMB request */
        unsigned largeBuf:1;    /* if valid response, is pointer to large buf */
        unsigned multiResp:1;   /* multiple trans2 responses for one request  */
};

struct oplock_q_entry {
        struct list_head qhead;
        struct inode * pinode;
        struct cifsTconInfo * tcon; 
        __u16 netfid;
};

#define   MID_FREE 0
#define   MID_REQUEST_ALLOCATED 1
#define   MID_REQUEST_SUBMITTED 2
#define   MID_RESPONSE_RECEIVED 4
#define   MID_RETRY_NEEDED      8 /* session closed while this request out */
#define   MID_NO_RESP_NEEDED 0x10
#define   MID_SMALL_BUFFER   0x20 /* 112 byte response buffer instead of 4K */

/*
 *****************************************************************
 * All constants go here
 *****************************************************************
 */

#define UID_HASH (16)

/*
 * Note that ONE module should define _DECLARE_GLOBALS_HERE to cause the
 * following to be declared.
 */

/****************************************************************************
 *  Locking notes.  All updates to global variables and lists should be
 *                  protected by spinlocks or semaphores.
 *
 *  Spinlocks
 *  ---------
 *  GlobalMid_Lock protects:
 *      list operations on pending_mid_q and oplockQ
 *      updates to XID counters, multiplex id  and SMB sequence numbers
 *  GlobalSMBSesLock protects:
 *      list operations on tcp and SMB session lists and tCon lists
 *  f_owner.lock protects certain per file struct operations
 *  mapping->page_lock protects certain per page operations
 *
 *  Semaphores
 *  ----------
 *  sesSem     operations on smb session
 *  tconSem    operations on tree connection
 *  fh_sem      file handle reconnection operations 
 *
 ****************************************************************************/

#ifdef DECLARE_GLOBALS_HERE
#define GLOBAL_EXTERN
#else
#define GLOBAL_EXTERN extern
#endif

/*
 * The list of servers that did not respond with NT LM 0.12.
 * This list helps improve performance and eliminate the messages indicating
 * that we had a communications error talking to the server in this list. 
 */
GLOBAL_EXTERN struct servers_not_supported *NotSuppList;        /*@z4a */

/*
 * The following is a hash table of all the users we know about.
 */
GLOBAL_EXTERN struct smbUidInfo *GlobalUidList[UID_HASH];

GLOBAL_EXTERN struct list_head GlobalServerList; /* BB not implemented yet */
GLOBAL_EXTERN struct list_head GlobalSMBSessionList;
GLOBAL_EXTERN struct list_head GlobalTreeConnectionList;
GLOBAL_EXTERN rwlock_t GlobalSMBSeslock;  /* protects list inserts on 3 above */

GLOBAL_EXTERN struct list_head GlobalOplock_Q;

/*
 * Global transaction id (XID) information
 */
GLOBAL_EXTERN unsigned int GlobalCurrentXid;    /* protected by GlobalMid_Sem */
GLOBAL_EXTERN unsigned int GlobalTotalActiveXid;        /* prot by GlobalMid_Sem */
GLOBAL_EXTERN unsigned int GlobalMaxActiveXid;  /* prot by GlobalMid_Sem */
GLOBAL_EXTERN spinlock_t GlobalMid_Lock;  /* protects above and list operations */
                                        /* on midQ entries */
GLOBAL_EXTERN char Local_System_Name[15];

/*
 *  Global counters, updated atomically
 */
GLOBAL_EXTERN atomic_t sesInfoAllocCount;
GLOBAL_EXTERN atomic_t tconInfoAllocCount;
GLOBAL_EXTERN atomic_t tcpSesAllocCount;
GLOBAL_EXTERN atomic_t tcpSesReconnectCount;
GLOBAL_EXTERN atomic_t tconInfoReconnectCount;

/* Various Debug counters to remove someday (BB) */
GLOBAL_EXTERN atomic_t bufAllocCount;
GLOBAL_EXTERN atomic_t smBufAllocCount;      
GLOBAL_EXTERN atomic_t midCount;

/* Misc globals */
GLOBAL_EXTERN unsigned int multiuser_mount;     /* if enabled allows new sessions
                                to be established on existing mount if we
                                have the uid/password or Kerberos credential 
                                or equivalent for current user */
GLOBAL_EXTERN unsigned int oplockEnabled;
GLOBAL_EXTERN unsigned int experimEnabled;
GLOBAL_EXTERN unsigned int lookupCacheEnabled;
GLOBAL_EXTERN unsigned int extended_security;   /* if on, session setup sent 
                                with more secure ntlmssp2 challenge/resp */
GLOBAL_EXTERN unsigned int ntlmv2_support;  /* better optional password hash */
GLOBAL_EXTERN unsigned int sign_CIFS_PDUs;  /* enable smb packet signing */
GLOBAL_EXTERN unsigned int linuxExtEnabled;/*enable Linux/Unix CIFS extensions*/
GLOBAL_EXTERN unsigned int CIFSMaxBufSize;  /* max size not including hdr */
GLOBAL_EXTERN unsigned int cifs_min_rcv;    /* min size of big ntwrk buf pool */
GLOBAL_EXTERN unsigned int cifs_min_small;  /* min size of small buf pool */
GLOBAL_EXTERN unsigned int cifs_max_pending; /* MAX requests at once to server*/