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Diffstat (limited to 'fs/cifs/cifsglob.h')
| -rw-r--r-- | fs/cifs/cifsglob.h | 439 |
1 files changed, 439 insertions, 0 deletions
diff --git a/fs/cifs/cifsglob.h b/fs/cifs/cifsglob.h new file mode 100644 index 000000000000..69aff1a7da9b --- /dev/null +++ b/fs/cifs/cifsglob.h @@ -0,0 +1,439 @@ +/* + * fs/cifs/cifsglob.h + * + * Copyright (C) International Business Machines Corp., 2002,2003 + * 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 */ +}; + +/* + * 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; + __u32 sequence_number; /* needed for CIFS PDU signature */ + __u16 ipc_tid; /* special tid for connection to IPC share */ + __u16 flags; + char mac_signing_key[CIFS_SESSION_KEY_SIZE + 16]; + char *serverOS; /* name of operating system underlying the server */ + char *serverNOS; /* name of network operating system that the server is running */ + 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 here?? */ + 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 */ + __u16 command; /* smb command code */ + 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 */ +}; + +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*/ + |