cifsglob.h

Linux内核自带的cifs模块

/*
 *   fs/cifs/cifsglob.h
 *
 *   Copyright (C) International Business Machines  Corp., 2002,2007
 *   Author(s): Steve French ([e-mail])
 *              Jeremy Allison ([e-mail])
 *
 *   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 <linux/version.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

#ifndef SLAB_NOFS
#define SLAB_NOFS GFP_NOFS
#endif

#ifndef SLAB_KERNEL
#define SLAB_KERNEL GFP_KERNEL
#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 {
	LANMAN = 0,             /* Legacy LANMAN auth */
	NTLM,			/* 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 */
};

struct mac_key {
	unsigned int len;
	union {
		char ntlm[CIFS_SESS_KEY_SIZE + 16];
		struct {
			char key[16];
			struct ntlmv2_resp resp;
		} ntlmv2;
	} data;
};

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

struct TCP_Server_Info {
	/* 15 character server name + 0x20 16th byte indicating type = srv */
	char server_RFC1001_name[SERVER_NAME_LEN_WITH_NULL];
	char unicode_server_Name[SERVER_NAME_LEN_WITH_NULL * 2];
	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 */
#ifdef CONFIG_CIFS_STATS2
	atomic_t inSend; /* requests trying to send */
	atomic_t num_waiters;   /* blocked waiting to get in sendrecv */
#endif
	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 */
	int timeAdj;  /* Adjust for difference in server time zone in sec */
	__u16 CurrentMid;         /* multiplex id - rotating counter */
	char cryptKey[CIFS_CRYPTO_KEY_SIZE];
	/* 16th byte of RFC1001 workstation name is always null */
	char workstation_RFC1001_name[SERVER_NAME_LEN_WITH_NULL];
	__u32 sequence_number; /* needed for CIFS PDU signature */
	struct mac_key mac_signing_key;
	char ntlmv2_hash[16];
	unsigned long lstrp; /* when we got last response from this server */
};

/*
 * 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;
#if 0
	struct cifsUidInfo *uidInfo;	/* pointer to user info */
#endif
	struct TCP_Server_Info *server;	/* pointer to server info */
	atomic_t inUse; /* # of mounts (tree connections) on this ses */
	enum statusEnum status;
	unsigned overrideSecFlg;  /* if non-zero override global sec flags */
	__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;
	char *password;
};
/* no more than one of the following three session flags may be set */
#define CIFS_SES_NT4 1
#define CIFS_SES_OS2 2
#define CIFS_SES_W9X 4
/* following flag is set for old servers such as OS2 (and Win95?)
   which do not negotiate NTLM or POSIX dialects, but instead
   negotiate one of the older LANMAN dialects */
#define CIFS_SES_LANMAN 8
/*
 * 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 */
	char *nativeFileSystem;
	__u16 tid;		/* The 2 byte tree id */
	__u16 Flags;		/* optional support bits */
	enum statusEnum tidStatus;
	atomic_t useCount;	/* how many explicit/implicit mounts to 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_closes;
	atomic_t num_deletes;
	atomic_t num_mkdirs;
	atomic_t num_rmdirs;
	atomic_t num_renames;
	atomic_t num_t2renames;
	atomic_t num_ffirst;
	atomic_t num_fnext;
	atomic_t num_fclose;
	atomic_t num_hardlinks;
	atomic_t num_symlinks;
	atomic_t num_locks;
	atomic_t num_acl_get;
	atomic_t num_acl_set;
#ifdef CONFIG_CIFS_STATS2
	unsigned long long time_writes;
	unsigned long long time_reads;
	unsigned long long time_opens;
	unsigned long long time_deletes;
	unsigned long long time_closes;
	unsigned long long time_mkdirs;
	unsigned long long time_rmdirs;
	unsigned long long time_renames;
	unsigned long long time_t2renames;
	unsigned long long time_ffirst;
	unsigned long long time_fnext;
	unsigned long long time_fclose;
#endif /* CONFIG_CIFS_STATS2 */
	__u64    bytes_read;
	__u64    bytes_written;
	spinlock_t stat_lock;
#endif /* CONFIG_CIFS_STATS */
	FILE_SYSTEM_DEVICE_INFO fsDevInfo;
	FILE_SYSTEM_ATTRIBUTE_INFO fsAttrInfo; /* ok if fs name truncated */
	FILE_SYSTEM_UNIX_INFO fsUnixInfo;
	unsigned retry:1;
	unsigned nocase:1;
	unsigned unix_ext:1; /* if off disable Linux extensions to CIFS protocol
				for this mount even if server would support */
	/* BB add field for back pointer to sb struct(s)? */
};

/*
 * This info hangs off the cifsFileInfo structure, pointed to by llist.
 * This is used to track byte stream locks on the file
 */
struct cifsLockInfo {
	struct list_head llist;	/* pointer to next cifsLockInfo */
	__u64 offset;
	__u64 length;
	__u8 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;