#ifndef SYS_PROTOSW_H
#define SYS_PROTOSW_H
/*
 * Copyright (c) 1982, 1986 Regents of the University of California.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms are permitted
 * provided that the above copyright notice and this paragraph are
 * duplicated in all such forms and that any documentation,
 * advertising materials, and other materials related to such
 * distribution and use acknowledge that the software was developed
 * by the University of California, Berkeley.  The name of the
 * University may not be used to endorse or promote products derived
 * from this software without specific prior written permission.
 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
 * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
 *
 *	@(#)protosw.h   7.3 (Berkeley) 6/27/88
 */

/*
 * Protocol switch table.
 *
 * Each protocol has a handle initializing one of these structures,
 * which is used for protocol-protocol and system-protocol communication.
 *
 * A protocol is called through the pr_init entry before any other.
 * Thereafter it is called every 200ms through the pr_fasttimo entry and
 * every 500ms through the pr_slowtimo for timer based actions.
 * The system will call the pr_drain entry if it is low on space and
 * this should throw away any non-critical data.
 *
 * Protocols pass data between themselves as chains of mbufs using
 * the pr_input and pr_output hooks.  Pr_input passes data up (towards
 * UNIX) and pr_output passes it down (towards the imps); control
 * information passes up and down on pr_ctlinput and pr_ctloutput.
 * The protocol is responsible for the space occupied by any the
 * arguments to these entries and must dispose it.
 *
 * The userreq routine interfaces protocols to the system and is
 * described below.
 */
struct protosw {
	short	pr_type;		/* socket type used for */
	struct	domain *pr_domain;	/* domain protocol a member of */
	short	pr_protocol;		/* protocol number */
	short	pr_flags;		/* see below */
/* protocol-protocol hooks */
	/* input to protocol (from below) */
	void	(*pr_input)(struct mbuf *, struct ifnet *);
	/* output to protocol (from above) */
	int	(*pr_output)(struct mbuf *, struct socket *);
	 /* control input (from below) */
	void	(*pr_ctlinput)(int, struct sockaddr *);
	 /* control output (from above) */
	int	(*pr_ctloutput)(int, struct socket *, int, int, struct mbuf **);
/* user-protocol hook */
	 /* user request: see list below */
	int	(*pr_usrreq)(struct socket *, int, struct mbuf *, struct mbuf *, struct mbuf *);
/* utility hooks */
	void	(*pr_init)(void);       /* initialization hook */
	void	(*pr_fasttimo)(void);   /* fast timeout (200ms) */
	void	(*pr_slowtimo)(void);   /* slow timeout (500ms) */
	void	(*pr_drain)(void);      /* flush any excess space possible */
};

#define PR_SLOWHZ	2		/* 2 slow timeouts per second */
#define PR_FASTHZ	5		/* 5 fast timeouts per second */

/*
 * Values for pr_flags
 */
#define PR_ATOMIC	0x01		/* exchange atomic messages only */
#define PR_ADDR 	0x02		/* addresses given with messages */
/* in the current implementation, PR_ADDR needs PR_ATOMIC to work */
#define PR_CONNREQUIRED 0x04		/* connection required by protocol */
#define PR_WANTRCVD	0x08		/* want PRU_RCVD calls */
#define PR_RIGHTS	0x10		/* passes capabilities */

/*
 * The arguments to usrreq are:
 *	(*protosw[].pr_usrreq)(up, req, m, nam, opt);
 * where up is a (struct socket *), req is one of these requests,
 * m is a optional mbuf chain containing a message,
 * nam is an optional mbuf chain containing an address,
 * and opt is a pointer to a socketopt structure or nil.
 * The protocol is responsible for disposal of the mbuf chain m,
 * the caller is responsible for any space held by nam and opt.
 * A non-zero return from usrreq gives an
 * UNIX error number which should be passed to higher level software.
 */
#define PRU_ATTACH		0	/* attach protocol to up */
#define PRU_DETACH		1	/* detach protocol from up */
#define PRU_BIND		2	/* bind socket to address */
#define PRU_LISTEN		3	/* listen for connection */
#define PRU_CONNECT		4	/* establish connection to peer */
#define PRU_ACCEPT		5	/* accept connection from peer */
#define PRU_DISCONNECT		6	/* disconnect from peer */
#define PRU_SHUTDOWN		7	/* won't send any more data */
#define PRU_RCVD		8	/* have taken data; more room now */
#define PRU_SEND		9	/* send this data */
#define PRU_ABORT		10	/* abort (fast DISCONNECT, DETATCH) */
#define PRU_CONTROL		11	/* control operations on protocol */
#define PRU_SENSE		12	/* return status into m */
#define PRU_RCVOOB		13	/* retrieve out of band data */
#define PRU_SENDOOB		14	/* send out of band data */
#define PRU_SOCKADDR		15	/* fetch socket's address */
#define PRU_PEERADDR		16	/* fetch peer's address */
#define PRU_CONNECT2		17	/* connect two sockets */
/* begin for protocols internal use */
#define PRU_FASTTIMO		18	/* 200ms timeout */
#define PRU_SLOWTIMO		19	/* 500ms timeout */
#define PRU_PROTORCV		20	/* receive from below */
#define PRU_PROTOSEND		21	/* send to below */

#define PRU_NREQ		21

#ifdef PRUREQUESTS
char *prurequests[] = {
	"ATTACH",       "DETACH",       "BIND",         "LISTEN",
	"CONNECT",      "ACCEPT",       "DISCONNECT",   "SHUTDOWN",
	"RCVD",         "SEND",         "ABORT",        "CONTROL",
	"SENSE",        "RCVOOB",       "SENDOOB",      "SOCKADDR",
	"PEERADDR",     "CONNECT2",     "FASTTIMO",     "SLOWTIMO",
	"PROTORCV",     "PROTOSEND",
};
#endif

/*
 * The arguments to the ctlinput routine are
 *	(*protosw[].pr_ctlinput)(cmd, arg);
 * where cmd is one of the commands below, and arg is
 * an optional argument (caddr_t).
 *
 * N.B. The IMP code, in particular, pressumes the values
 *	of some of the commands; change with extreme care.
 * TODO:
 *	spread out codes so new ICMP codes can be
 *	accomodated more easily
 */
#define PRC_IFDOWN		0	/* interface transition */
#define PRC_ROUTEDEAD		1	/* select new route if possible */
#define PRC_QUENCH		4	/* some said to slow down */
#define PRC_MSGSIZE		5	/* message size forced drop */
#define PRC_HOSTDEAD		6	/* normally from IMP */
#define PRC_HOSTUNREACH 	7	/* ditto */
#define PRC_UNREACH_NET 	8	/* no route to network */
#define PRC_UNREACH_HOST	9	/* no route to host */
#define PRC_UNREACH_PROTOCOL	10	/* dst says bad protocol */
#define PRC_UNREACH_PORT	11	/* bad port # */
#define PRC_UNREACH_NEEDFRAG	12	/* IP_DF caused drop */
#define PRC_UNREACH_SRCFAIL	13	/* source route failed */
#define PRC_REDIRECT_NET	14	/* net routing redirect */
#define PRC_REDIRECT_HOST	15	/* host routing redirect */
#define PRC_REDIRECT_TOSNET	16	/* redirect for type of service & net */
#define PRC_REDIRECT_TOSHOST	17	/* redirect for tos & host */
#define PRC_TIMXCEED_INTRANS	18	/* packet lifetime expired in transit */
#define PRC_TIMXCEED_REASS	19	/* lifetime expired on reass q */
#define PRC_PARAMPROB		20	/* header incorrect */

#define PRC_NCMDS		21

#ifdef PRCREQUESTS
char	*prcrequests[] = {
	"IFDOWN", "ROUTEDEAD", "#2", "#3",
	"QUENCH", "MSGSIZE", "HOSTDEAD", "HOSTUNREACH",
	"NET-UNREACH", "HOST-UNREACH", "PROTO-UNREACH", "PORT-UNREACH",
	"FRAG-UNREACH", "SRCFAIL-UNREACH", "NET-REDIRECT", "HOST-REDIRECT",
	"TOSNET-REDIRECT", "TOSHOST-REDIRECT", "TX-INTRANS", "TX-REASS",
	"PARAMPROB"
};
#endif

/*
 * The arguments to ctloutput are:
 *	(*protosw[].pr_ctloutput)(req, so, level, optname, optval);
 * req is one of the actions listed below, so is a (struct socket *),
 * level is an indication of which protocol layer the option is intended.
 * optname is a protocol dependent socket option request,
 * optval is a pointer to a mbuf-chain pointer, for value-return results.
 * The protocol is responsible for disposal of the mbuf chain *optval
 * if supplied,
 * the caller is responsible for any space held by *optval, when returned.
 * A non-zero return from usrreq gives an
 * UNIX error number which should be passed to higher level software.
 */
#define PRCO_GETOPT	0
#define PRCO_SETOPT	1

#define PRCO_NCMDS	2

#ifdef PRCOREQUESTS
char	*prcorequests[] = {
	"GETOPT", "SETOPT",
};
#endif

#ifdef KERNEL
#if 0
extern  struct protosw *pffindproto(), *pffindtype();
#endif
#endif

#endif
