/*
 * Copyright (c) 1989, 1993, 1995
 *	The Regents of the University of California.  All rights reserved.
 *
 * This code is derived from software contributed to Berkeley by
 * Rick Macklem at The University of Guelph.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *	This product includes software developed by the University of
 *	California, Berkeley and its contributors.
 * 4. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 *
 *	@(#)nfs.h	8.4 (Berkeley) 5/1/95
 * $FreeBSD$
 */

#ifndef _NFSSERVER_NFS_H_
#define _NFSSERVER_NFS_H_

#ifdef _KERNEL
#include "opt_nfs.h"
#endif

/*
 * Tunable constants for nfs
 */

#define NFS_TICKINTVL	5		/* Desired time for a tick (msec) */
#define NFS_HZ		(hz / nfs_ticks) /* Ticks/sec */
#define	NFS_TIMEO	(1 * NFS_HZ)	/* Default timeout = 1 second */
#define	NFS_MINTIMEO	(1 * NFS_HZ)	/* Min timeout to use */
#define	NFS_MAXTIMEO	(60 * NFS_HZ)	/* Max timeout to backoff to */
#define	NFS_MINIDEMTIMEO (5 * NFS_HZ)	/* Min timeout for non-idempotent ops*/
#define	NFS_MAXUIDHASH	64		/* Max. # of hashed uid entries/mp */
#ifndef NFS_GATHERDELAY
#define NFS_GATHERDELAY		10	/* Default write gather delay (msec) */
#endif
#ifdef _KERNEL
#define	DIRBLKSIZ	512		/* XXX we used to use ufs's DIRBLKSIZ */
#endif

/*
 * Oddballs
 */
#define NFS_SRVMAXDATA(n) \
		(((n)->nd_flag & ND_NFSV3) ? (((n)->nd_nam2) ? \
		 NFS_MAXDGRAMDATA : NFS_MAXDATA) : NFS_V2MAXDATA)

/*
 * XXX
 * The B_INVAFTERWRITE flag should be set to whatever is required by the
 * buffer cache code to say "Invalidate the block after it is written back".
 */
#define	B_INVAFTERWRITE	B_NOCACHE

/*
 * The IO_METASYNC flag should be implemented for local filesystems.
 * (Until then, it is nothin at all.)
 */
#ifndef IO_METASYNC
#define IO_METASYNC	0
#endif


/* NFS state flags XXX -Wunused */
#define	NFSRV_SNDLOCK		0x01000000  /* Send socket lock */
#define	NFSRV_WANTSND		0x02000000  /* Want above */

/*
 * Structures for the nfssvc(2) syscall. Not that anyone but nfsd and mount_nfs
 * should ever try and use it.
 */
struct nfsd_args {
	int	sock;		/* Socket to serve */
	caddr_t	name;		/* Client addr for connection based sockets */
	int	namelen;	/* Length of name */
};

struct nfsd_srvargs {
	struct nfsd	*nsd_nfsd;	/* Pointer to in kernel nfsd struct */
	uid_t		nsd_uid;	/* Effective uid mapped to cred */
	u_int32_t	nsd_haddr;	/* Ip address of client */
	struct xucred	nsd_cr;		/* Cred. uid maps to */
	u_int		nsd_authlen;	/* Length of auth string (ret) */
	u_char		*nsd_authstr;	/* Auth string (ret) */
	u_int		nsd_verflen;	/* and the verfier */
	u_char		*nsd_verfstr;
	struct timeval	nsd_timestamp;	/* timestamp from verifier */
	u_int32_t	nsd_ttl;	/* credential ttl (sec) */
};

struct nfsd_cargs {
	char		*ncd_dirp;	/* Mount dir path */
	uid_t		ncd_authuid;	/* Effective uid */
	int		ncd_authtype;	/* Type of authenticator */
	u_int		ncd_authlen;	/* Length of authenticator string */
	u_char		*ncd_authstr;	/* Authenticator string */
	u_int		ncd_verflen;	/* and the verifier */
	u_char		*ncd_verfstr;
};

/*
 * XXX to allow amd to include nfs.h without nfsproto.h
 */
#ifdef NFS_NPROCS
#include <nfsserver/nfsrvstats.h>
#endif

/*
 * Flags for nfssvc() system call.
 */
#define	NFSSVC_NFSD	0x004
#define	NFSSVC_ADDSOCK	0x008

/*
 * vfs.nfsrv sysctl(3) identifiers
 */
#define NFS_NFSRVSTATS	1		/* struct: struct nfsrvstats */
#define NFS_NFSPRIVPORT	2		/* int: prohibit nfs to resvports */

#ifdef _KERNEL

#ifdef MALLOC_DECLARE
MALLOC_DECLARE(M_NFSRVDESC);
MALLOC_DECLARE(M_NFSD);
#endif

/* Forward declarations */
struct nfssvc_sock;
struct nfsrv_descript;
struct uio;
struct vattr;
struct nameidata;

extern struct callout_handle nfsrv_timer_handle;
extern struct nfsrvstats nfsrvstats;

extern int	nfsrv_ticks;
extern int	nfsrvw_procrastinate;
extern int	nfsrvw_procrastinate_v3;

/* Various values converted to XDR form. */
extern u_int32_t nfsrv_nfs_false, nfsrv_nfs_true, nfsrv_nfs_xdrneg1,
	nfsrv_nfs_prog;
extern u_int32_t nfsrv_rpc_reply, nfsrv_rpc_msgdenied, nfsrv_rpc_mismatch,
	nfsrv_rpc_vers;
extern u_int32_t nfsrv_rpc_auth_unix, nfsrv_rpc_msgaccepted, nfsrv_rpc_call,
	nfsrv_rpc_autherr;

/* Procedure table data */
extern int	nfsrvv2_procid[NFS_NPROCS];
extern int	nfsrv_nfsv3_procid[NFS_NPROCS];
extern int32_t (*nfsrv3_procs[NFS_NPROCS])(struct nfsrv_descript *nd,
		    struct nfssvc_sock *slp, struct thread *td,
		    struct mbuf **mreqp);

/*
 * A list of nfssvc_sock structures is maintained with all the sockets
 * that require service by the nfsd.
 */
#ifndef NFS_WDELAYHASHSIZ
#define	NFS_WDELAYHASHSIZ 16	/* and with this */
#endif
#define	NWDELAYHASH(sock, f) \
	(&(sock)->ns_wdelayhashtbl[(*((u_int32_t *)(f))) % NFS_WDELAYHASHSIZ])

/*
 * Network address hash list element
 */
union nethostaddr {
	u_int32_t had_inetaddr;
	struct sockaddr *had_nam;
};

struct nfsrv_rec {
	STAILQ_ENTRY(nfsrv_rec) nr_link;
	struct sockaddr	*nr_address;
	struct mbuf	*nr_packet;
};

struct nfssvc_sock {
	TAILQ_ENTRY(nfssvc_sock) ns_chain;	/* List of all nfssvc_sock's */
	struct file	*ns_fp;
	struct socket	*ns_so;
	struct sockaddr	*ns_nam;
	struct mbuf	*ns_raw;
	struct mbuf	*ns_rawend;
	STAILQ_HEAD(, nfsrv_rec) ns_rec;
	struct mbuf	*ns_frag;
	int		ns_flag;
	int		ns_solock;
	int		ns_cc;
	int		ns_reclen;
	u_int32_t	ns_sref;
	LIST_HEAD(, nfsrv_descript) ns_tq;	/* Write gather lists */
	LIST_HEAD(nfsrvw_delayhash, nfsrv_descript) ns_wdelayhashtbl[NFS_WDELAYHASHSIZ];
};

/* Bits for "ns_flag" */
#define	SLP_VALID	0x01
#define	SLP_DOREC	0x02
#define	SLP_NEEDQ	0x04
#define	SLP_DISCONN	0x08
#define	SLP_GETSTREAM	0x10
#define	SLP_LASTFRAG	0x20
#define SLP_ALLFLAGS	0xff

extern TAILQ_HEAD(nfssvc_sockhead, nfssvc_sock) nfssvc_sockhead;
extern int nfssvc_sockhead_flag;
#define	SLP_INIT	0x01
#define	SLP_WANTINIT	0x02

/*
 * One of these structures is allocated for each nfsd.
 */
struct nfsd {
	TAILQ_ENTRY(nfsd) nfsd_chain;	/* List of all nfsd's */
	int		nfsd_flag;	/* NFSD_ flags */
	struct nfssvc_sock *nfsd_slp;	/* Current socket */
	int		nfsd_authlen;	/* Authenticator len */
	u_char		nfsd_authstr[RPCAUTH_MAXSIZ]; /* Authenticator data */
	int		nfsd_verflen;	/* and the Verifier */
	u_char		nfsd_verfstr[RPCVERF_MAXSIZ];
	struct thread	*nfsd_td;	/* daemon thread ptr */
	struct nfsrv_descript *nfsd_nd;	/* Associated nfsrv_descript */
};

/* Bits for "nfsd_flag" */
#define	NFSD_WAITING	0x01
#define	NFSD_REQINPROG	0x02

/*
 * This structure is used by the server for describing each request.
 * Some fields are used only when write request gathering is performed.
 */
struct nfsrv_descript {
	u_quad_t		nd_time;	/* Write deadline (usec) */
	off_t			nd_off;		/* Start byte offset */
	off_t			nd_eoff;	/* and end byte offset */
	LIST_ENTRY(nfsrv_descript) nd_hash;	/* Hash list */
	LIST_ENTRY(nfsrv_descript) nd_tq;	/* and timer list */
	LIST_HEAD(, nfsrv_descript) nd_coalesce;/* coalesced writes */
	struct mbuf		*nd_mrep;	/* Request mbuf list */
	struct mbuf		*nd_md;		/* Current dissect mbuf */
	struct mbuf		*nd_mreq;	/* Reply mbuf list */
	struct sockaddr		*nd_nam;	/* and socket addr */
	struct sockaddr		*nd_nam2;	/* return socket addr */
	caddr_t			nd_dpos;	/* Current dissect pos */
	u_int32_t		nd_procnum;	/* RPC # */
	int			nd_stable;	/* storage type */
	int			nd_flag;	/* nd_flag */
	int			nd_len;		/* Length of this write */
	int			nd_repstat;	/* Reply status */
	u_int32_t		nd_retxid;	/* Reply xid */
	struct timeval		nd_starttime;	/* Time RPC initiated */
	fhandle_t		nd_fh;		/* File handle */
	struct ucred		nd_cr;		/* Credentials */
};

/* Bits for "nd_flag" */
#define ND_NFSV3	0x08

extern TAILQ_HEAD(nfsd_head, nfsd) nfsd_head;
extern int nfsd_head_flag;
#define	NFSD_CHECKSLP	0x01

/*
 * These macros compare nfsrv_descript structures.
 */
#define NFSW_CONTIG(o, n) \
		((o)->nd_eoff >= (n)->nd_off && \
		 !bcmp((caddr_t)&(o)->nd_fh, (caddr_t)&(n)->nd_fh, NFSX_V3FH))

#define NFSW_SAMECRED(o, n) \
	(!bcmp((caddr_t)&(o)->nd_cr, (caddr_t)&(n)->nd_cr, \
		sizeof (struct ucred)))

/*
 * Defines for WebNFS
 */

#define WEBNFS_ESC_CHAR		'%'
#define WEBNFS_SPECCHAR_START	0x80

#define WEBNFS_NATIVE_CHAR	0x80
/*
 * ..
 * Possibly more here in the future.
 */

/*
 * Macro for converting escape characters in WebNFS pathnames.
 * Should really be in libkern.
 */

#define HEXTOC(c) \
	((c) >= 'a' ? ((c) - ('a' - 10)) : \
	    ((c) >= 'A' ? ((c) - ('A' - 10)) : ((c) - '0')))
#define HEXSTRTOI(p) \
	((HEXTOC(p[0]) << 4) + HEXTOC(p[1]))

#ifdef NFS_DEBUG

extern int nfs_debug;
#define NFS_DEBUG_ASYNCIO	1 /* asynchronous i/o */
#define NFS_DEBUG_WG		2 /* server write gathering */
#define NFS_DEBUG_RC		4 /* server request caching */

#define NFS_DPF(cat, args)					\
	do {							\
		if (nfs_debug & NFS_DEBUG_##cat) printf args;	\
	} while (0)

#else

#define NFS_DPF(cat, args)

#endif

int	nfs_getreq(struct nfsrv_descript *, struct nfsd *, int);
int	nfsrv_send(struct socket *, struct sockaddr *, struct mbuf *);
struct mbuf *nfs_rephead(int, struct nfsrv_descript *, int, struct mbuf **,
	    caddr_t *);
int	nfs_slplock(struct nfssvc_sock *, int);
void	nfs_slpunlock(struct nfssvc_sock *);
void	nfsm_srvfattr(struct nfsrv_descript *, struct vattr *,
	    struct nfs_fattr *);
void	nfsm_srvwcc(struct nfsrv_descript *, int, struct vattr *, int,
	    struct vattr *, struct mbuf **, char **);
void	nfsm_srvpostopattr(struct nfsrv_descript *, int, struct vattr *,
	    struct mbuf **, char **);
int	netaddr_match(int, union nethostaddr *, struct sockaddr *);
int	nfs_namei(struct nameidata *, fhandle_t *, int,
	    struct nfssvc_sock *, struct sockaddr *, struct mbuf **,
	    caddr_t *, struct vnode **, struct thread *, int);
void	nfsm_adj(struct mbuf *, int, int);
int	nfsm_mbuftouio(struct mbuf **, struct uio *, int, caddr_t *);
void	nfsrv_initcache(void);
void	nfsrv_timer(void *);
int	nfsrv_dorec(struct nfssvc_sock *, struct nfsd *,
	    struct nfsrv_descript **);
int	nfsrv_getcache(struct nfsrv_descript *, struct mbuf **);
void	nfsrv_updatecache(struct nfsrv_descript *, int, struct mbuf *);
void	nfsrv_cleancache(void);
void	nfsrv_init(int);
int	nfsrv_errmap(struct nfsrv_descript *, int);
void	nfsrvw_sort(gid_t *, int);
void	nfsrv_setcred(struct ucred *, struct ucred *);
int	nfsrv_object_create(struct vnode *);
void	nfsrv_wakenfsd(struct nfssvc_sock *slp);
int	nfsrv_writegather(struct nfsrv_descript **, struct nfssvc_sock *,
	    struct thread *, struct mbuf **);

int	nfsrv3_access(struct nfsrv_descript *nfsd, struct nfssvc_sock *slp,
	    struct thread *td, struct mbuf **mrq);
int	nfsrv_commit(struct nfsrv_descript *nfsd, struct nfssvc_sock *slp,
	    struct thread *td, struct mbuf **mrq);
int	nfsrv_create(struct nfsrv_descript *nfsd, struct nfssvc_sock *slp,
	    struct thread *td, struct mbuf **mrq);
int	nfsrv_fhtovp(fhandle_t *, int, struct vnode **, struct ucred *,
	    struct nfssvc_sock *, struct sockaddr *, int *, int);
int	nfsrv_setpublicfs(struct mount *, struct netexport *,
	    struct export_args *);
int	nfs_ispublicfh(fhandle_t *);
int	nfsrv_fsinfo(struct nfsrv_descript *nfsd, struct nfssvc_sock *slp,
	    struct thread *td, struct mbuf **mrq);
int	nfsrv_getattr(struct nfsrv_descript *nfsd, struct nfssvc_sock *slp,
	    struct thread *td, struct mbuf **mrq);
int	nfsrv_link(struct nfsrv_descript *nfsd, struct nfssvc_sock *slp,
	    struct thread *td, struct mbuf **mrq);
int	nfsrv_lookup(struct nfsrv_descript *nfsd, struct nfssvc_sock *slp,
	    struct thread *td, struct mbuf **mrq);
int	nfsrv_mkdir(struct nfsrv_descript *nfsd, struct nfssvc_sock *slp,
	    struct thread *td, struct mbuf **mrq);
int	nfsrv_mknod(struct nfsrv_descript *nfsd, struct nfssvc_sock *slp,
	    struct thread *td, struct mbuf **mrq);
int	nfsrv_noop(struct nfsrv_descript *nfsd, struct nfssvc_sock *slp,
	    struct thread *td, struct mbuf **mrq);
int	nfsrv_null(struct nfsrv_descript *nfsd, struct nfssvc_sock *slp,
	    struct thread *td, struct mbuf **mrq);
int	nfsrv_pathconf(struct nfsrv_descript *nfsd, struct nfssvc_sock *slp,
	    struct thread *td, struct mbuf **mrq);
int	nfsrv_read(struct nfsrv_descript *nfsd, struct nfssvc_sock *slp,
	    struct thread *td, struct mbuf **mrq);
int	nfsrv_readdir(struct nfsrv_descript *nfsd, struct nfssvc_sock *slp,
	    struct thread *td, struct mbuf **mrq);
int	nfsrv_readdirplus(struct nfsrv_descript *nfsd, struct nfssvc_sock *slp,
	    struct thread *td, struct mbuf **mrq);
int	nfsrv_readlink(struct nfsrv_descript *nfsd, struct nfssvc_sock *slp,
	    struct thread *td, struct mbuf **mrq);
int	nfsrv_remove(struct nfsrv_descript *nfsd, struct nfssvc_sock *slp,
	    struct thread *td, struct mbuf **mrq);
int	nfsrv_rename(struct nfsrv_descript *nfsd, struct nfssvc_sock *slp,
	    struct thread *td, struct mbuf **mrq);
int	nfsrv_rmdir(struct nfsrv_descript *nfsd, struct nfssvc_sock *slp,
	    struct thread *td, struct mbuf **mrq);
int	nfsrv_setattr(struct nfsrv_descript *nfsd, struct nfssvc_sock *slp,
	    struct thread *td, struct mbuf **mrq);
int	nfsrv_statfs(struct nfsrv_descript *nfsd, struct nfssvc_sock *slp,
	    struct thread *td, struct mbuf **mrq);
int	nfsrv_symlink(struct nfsrv_descript *nfsd, struct nfssvc_sock *slp,
	    struct thread *td, struct mbuf **mrq);
int	nfsrv_write(struct nfsrv_descript *nfsd, struct nfssvc_sock *slp,
	    struct thread *td, struct mbuf **mrq);
void	nfsrv_rcv(struct socket *so, void *arg, int waitflag);
void	nfsrv_slpderef(struct nfssvc_sock *slp);
#endif	/* _KERNEL */

#endif