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//==========================================================================

//

//      include/sys/protosw.h

//

//==========================================================================

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// Portions of this software may have been derived from OpenBSD, 

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// copyright disclaimers included herein.

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// Portions created by Red Hat are

// Copyright (C) 2002 Red Hat, Inc. All Rights Reserved.

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/*-

 * Copyright (c) 1982, 1986, 1993

 *      The Regents of the University of California.  All rights reserved.

 *

 * 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.

 *

 *      @(#)protosw.h   8.1 (Berkeley) 6/2/93

 * $FreeBSD: src/sys/sys/protosw.h,v 1.28.2.2 2001/07/03 11:02:01 ume Exp $

 */

#ifndef _SYS_PROTOSW_H_

#define _SYS_PROTOSW_H_

/* Forward declare these structures referenced from prototypes below. */

struct mbuf;

struct proc;

struct sockaddr;

struct socket;

struct sockopt;

/*#ifdef _KERNEL*/

/*

 * 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

 * the users) and pr_output passes it down (towards the interfaces); 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.

 *

 * In retrospect, it would be a lot nicer to use an interface

 * similar to the vnode VOP interface.

 */

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 */

        void    (*pr_input) __P((struct mbuf *, int len));

                                        /* input to protocol (from below) */

        int     (*pr_output)    __P((struct mbuf *m, struct socket *so));

                                        /* output to protocol (from above) */

        void    (*pr_ctlinput)__P((int, struct sockaddr *, void *));

                                        /* control input (from below) */

        int     (*pr_ctloutput)__P((struct socket *, struct sockopt *));

                                        /* control output (from above) */

/* user-protocol hook */

        void    *pr_ousrreq;

/* utility hooks */

        void    (*pr_init) __P((void)); /* initialization hook */

        void    (*pr_fasttimo) __P((void));

                                        /* fast timeout (200ms) */

        void    (*pr_slowtimo) __P((void));

                                        /* slow timeout (500ms) */

        void    (*pr_drain) __P((void));

                                        /* flush any excess space possible */

        struct  pr_usrreqs *pr_usrreqs; /* supersedes pr_usrreq() */

};

/*#endif*/

#define PR_SLOWHZ       2               /* 2 slow timeouts per second */

#define PR_FASTHZ       5               /* 5 fast timeouts per second */

/*

 * Values for pr_flags.

 * PR_ADDR requires PR_ATOMIC;

 * PR_ADDR and PR_CONNREQUIRED are mutually exclusive.

 * PR_IMPLOPCL means that the protocol allows sendto without prior connect,

 *      and the protocol understands the MSG_EOF flag.  The first property is

 *      is only relevant if PR_CONNREQUIRED is set (otherwise sendto is allowed

 *      anyhow).

 */

#define PR_ATOMIC       0x01            /* exchange atomic messages only */

#define PR_ADDR         0x02            /* addresses given with messages */

#define PR_CONNREQUIRED 0x04            /* connection required by protocol */

#define PR_WANTRCVD     0x08            /* want PRU_RCVD calls */

#define PR_RIGHTS       0x10            /* passes capabilities */

#define PR_IMPLOPCL     0x20            /* implied open/close */

#define PR_LASTHDR      0x40            /* enforce ipsec policy; last header */

/*

 * 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 */

/* end for protocol's internal use */

#define PRU_SEND_EOF            22      /* send and close */

#define PRU_NREQ                22

#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",

        "SEND_EOF",

};

#endif

#ifdef  _KERNEL                 /* users shouldn't see this decl */

struct ifnet;

struct stat;

struct ucred;

struct uio;

/*

 * If the ordering here looks odd, that's because it's alphabetical.

 * Having this structure separated out from the main protoswitch is allegedly

 * a big (12 cycles per call) lose on high-end CPUs.  We will eventually

 * migrate this stuff back into the main structure.

 */

struct pr_usrreqs {

        int     (*pru_abort) __P((struct socket *so));

        int     (*pru_accept) __P((struct socket *so, struct sockaddr **nam));

        int     (*pru_attach) __P((struct socket *so, int proto,

                                   struct proc *p));

        int     (*pru_bind) __P((struct socket *so, struct sockaddr *nam,

                                 struct proc *p));

        int     (*pru_connect) __P((struct socket *so, struct sockaddr *nam,

                                    struct proc *p));

        int     (*pru_connect2) __P((struct socket *so1, struct socket *so2));

        int     (*pru_control) __P((struct socket *so, u_long cmd, caddr_t data,

                                    struct ifnet *ifp, struct proc *p));

        int     (*pru_detach) __P((struct socket *so));

        int     (*pru_disconnect) __P((struct socket *so));

        int     (*pru_listen) __P((struct socket *so, struct proc *p));

        int     (*pru_peeraddr) __P((struct socket *so,

                                     struct sockaddr **nam));

        int     (*pru_rcvd) __P((struct socket *so, int flags));

        int     (*pru_rcvoob) __P((struct socket *so, struct mbuf *m,

                                   int flags));

        int     (*pru_send) __P((struct socket *so, int flags, struct mbuf *m,

                                 struct sockaddr *addr, struct mbuf *control,

                                 struct proc *p));

#define PRUS_OOB        0x1

#define PRUS_EOF        0x2

#define PRUS_MORETOCOME 0x4

        int     (*pru_sense) __P((struct socket *so, struct stat *sb));

        int     (*pru_shutdown) __P((struct socket *so));

        int     (*pru_sockaddr) __P((struct socket *so,

                                     struct sockaddr **nam));

        /*

         * These three added later, so they are out of order.  They are used

         * for shortcutting (fast path input/output) in some protocols.

         * XXX - that's a lie, they are not implemented yet

         * Rather than calling sosend() etc. directly, calls are made

         * through these entry points.  For protocols which still use

         * the generic code, these just point to those routines.

         */

        int     (*pru_sosend) __P((struct socket *so, struct sockaddr *addr,

                                   struct uio *uio, struct mbuf *top,

                                   struct mbuf *control, int flags,

                                   struct proc *p));

        int     (*pru_soreceive) __P((struct socket *so,

                                      struct sockaddr **paddr,

                                      struct uio *uio, struct mbuf **mp0,

                                      struct mbuf **controlp, int *flagsp));

        int     (*pru_sopoll) __P((struct socket *so, int events,

                                     struct ucred *cred, struct proc *p));

};

int     pru_accept_notsupp __P((struct socket *so, struct sockaddr **nam));

int     pru_connect_notsupp __P((struct socket *so, struct sockaddr *nam,

                                 struct proc *p));

int     pru_connect2_notsupp __P((struct socket *so1, struct socket *so2));

int     pru_control_notsupp __P((struct socket *so, u_long cmd, caddr_t data,

                                 struct ifnet *ifp, struct proc *p));

int     pru_listen_notsupp __P((struct socket *so, struct proc *p));

int     pru_rcvd_notsupp __P((struct socket *so, int flags));

int     pru_rcvoob_notsupp __P((struct socket *so, struct mbuf *m, int flags));

int     pru_sense_null __P((struct socket *so, struct stat *sb));

#endif /* _KERNEL */

/*

 * The arguments to the ctlinput routine are

 *      (*protosw[].pr_ctlinput)(cmd, sa, arg);

 * where cmd is one of the commands below, sa is a pointer to a sockaddr,

 * and arg is a `void *' argument used within a protocol family.

 */

#define PRC_IFDOWN              0        /* interface transition */

#define PRC_ROUTEDEAD           1       /* select new route if possible ??? */

#define PRC_IFUP                2       /* interface has come back up */

#define PRC_QUENCH2             3       /* DEC congestion bit says slow down */

#define PRC_QUENCH              4       /* some one said to slow down */

#define PRC_MSGSIZE             5       /* message size forced drop */

#define PRC_HOSTDEAD            6       /* host appears to be down */

#define PRC_HOSTUNREACH         7       /* deprecated (use PRC_UNREACH_HOST) */

#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 # */

/* was  PRC_UNREACH_NEEDFRAG    12         (use PRC_MSGSIZE) */

#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_UNREACH_ADMIN_PROHIB        21      /* packet administrativly prohibited */

#define PRC_NCMDS               22

#define PRC_IS_REDIRECT(cmd)    \

        ((cmd) >= PRC_REDIRECT_NET && (cmd) <= PRC_REDIRECT_TOSHOST)

#ifdef PRCREQUESTS

char    *prcrequests[] = {

        "IFDOWN", "ROUTEDEAD", "IFUP", "DEC-BIT-QUENCH2",

        "QUENCH", "MSGSIZE", "HOSTDEAD", "#7",

        "NET-UNREACH", "HOST-UNREACH", "PROTO-UNREACH", "PORT-UNREACH",

        "#12", "SRCFAIL-UNREACH", "NET-REDIRECT", "HOST-REDIRECT",

        "TOSNET-REDIRECT", "TOSHOST-REDIRECT", "TX-INTRANS", "TX-REASS",

        "PARAMPROB", "ADMIN-UNREACH"

};

#endif

/*

 * The arguments to ctloutput are:

 *      (*protosw[].pr_ctloutput)(req, so, level, optname, optval, p);

 * 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

void    pfctlinput __P((int, struct sockaddr *));

void    pfctlinput2 __P((int, struct sockaddr *, void *));

struct protosw *pffindproto __P((int family, int protocol, int type));

struct protosw *pffindtype __P((int family, int type));

#endif

#endif