FreeBSD/Linux Kernel Cross Reference
sys/sys/protosw.h

     /*-
      * 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: releng/5.2/sys/sys/protosw.h 122875 2003-11-18 00:39:07Z rwatson $
     */
    
    #ifndef _SYS_PROTOSW_H_
    #define _SYS_PROTOSW_H_
    
    /* Forward declare these structures referenced from prototypes below. */
    struct mbuf;
    struct thread;
    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.
     */
    /* USE THESE FOR YOUR PROTOTYPES ! */
    typedef void    pr_input_t (struct mbuf *, int);
    typedef int     pr_input6_t (struct mbuf **, int*, int);  /* XXX FIX THIS */
    typedef void    pr_in_input_t (struct mbuf *, int, int); /* XXX FIX THIS */
    typedef int     pr_output_t (struct mbuf *, struct socket *);
    typedef int     pr_in_output_t (struct mbuf *, struct socket *, struct sockaddr *);
    typedef void    pr_ctlinput_t (int, struct sockaddr *, void *);
    typedef int     pr_ctloutput_t (struct socket *, struct sockopt *);
    typedef void    pr_init_t (void);
    typedef void    pr_fasttimo_t (void);
    typedef void    pr_slowtimo_t (void);
    typedef void    pr_drain_t (void);
    
    typedef int     pr_usrreq_t(struct socket *, int, struct mbuf *,
                                 struct mbuf *, struct mbuf *, struct thread *);
    
    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 */
            pr_input_t *pr_input;           /* input to protocol (from below) */
            pr_output_t *pr_output;         /* output to protocol (from above) */
            pr_ctlinput_t *pr_ctlinput;     /* control input (from below) */
            pr_ctloutput_t *pr_ctloutput;   /* control output (from above) */
    /* user-protocol hook */
            pr_usrreq_t     *pr_ousrreq;
    /* utility hooks */
            pr_init_t *pr_init;
           pr_fasttimo_t *pr_fasttimo;     /* fast timeout (200ms) */
           pr_slowtimo_t *pr_slowtimo;     /* slow timeout (500ms) */
           pr_drain_t *pr_drain;           /* 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 an 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
   const 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)(struct socket *so);
           int     (*pru_accept)(struct socket *so, struct sockaddr **nam);
           int     (*pru_attach)(struct socket *so, int proto, struct thread *td);
           int     (*pru_bind)(struct socket *so, struct sockaddr *nam,
                       struct thread *td);
           int     (*pru_connect)(struct socket *so, struct sockaddr *nam,
                       struct thread *td);
           int     (*pru_connect2)(struct socket *so1, struct socket *so2);
           int     (*pru_control)(struct socket *so, u_long cmd, caddr_t data,
                       struct ifnet *ifp, struct thread *td);
           int     (*pru_detach)(struct socket *so);
           int     (*pru_disconnect)(struct socket *so);
           int     (*pru_listen)(struct socket *so, struct thread *td);
           int     (*pru_peeraddr)(struct socket *so, struct sockaddr **nam);
           int     (*pru_rcvd)(struct socket *so, int flags);
           int     (*pru_rcvoob)(struct socket *so, struct mbuf *m, int flags);
           int     (*pru_send)(struct socket *so, int flags, struct mbuf *m, 
                       struct sockaddr *addr, struct mbuf *control,
                       struct thread *td);
   #define PRUS_OOB        0x1
   #define PRUS_EOF        0x2
   #define PRUS_MORETOCOME 0x4
           int     (*pru_sense)(struct socket *so, struct stat *sb);
           int     (*pru_shutdown)(struct socket *so);
           int     (*pru_sockaddr)(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)(struct socket *so, struct sockaddr *addr,
                       struct uio *uio, struct mbuf *top, struct mbuf *control,
                       int flags, struct thread *td);
           int     (*pru_soreceive)(struct socket *so, struct sockaddr **paddr,
                       struct uio *uio, struct mbuf **mp0, struct mbuf **controlp,
                       int *flagsp);
           int     (*pru_sopoll)(struct socket *so, int events,
                       struct ucred *cred, struct thread *td);
           void    (*pru_sosetlabel)(struct socket *so);
   };
   
   int     pru_accept_notsupp(struct socket *so, struct sockaddr **nam);
   int     pru_connect_notsupp(struct socket *so, struct sockaddr *nam,
               struct thread *td);
   int     pru_connect2_notsupp(struct socket *so1, struct socket *so2);
   int     pru_control_notsupp(struct socket *so, u_long cmd, caddr_t data,
               struct ifnet *ifp, struct thread *td);
   int     pru_listen_notsupp(struct socket *so, struct thread *td);
   int     pru_rcvd_notsupp(struct socket *so, int flags);
   int     pru_rcvoob_notsupp(struct socket *so, struct mbuf *m, int flags);
   int     pru_sense_null(struct socket *so, struct stat *sb);
   void    pru_sosetlabel_null(struct socket *so);
   
   #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(int, struct sockaddr *);
   void    pfctlinput2(int, struct sockaddr *, void *);
   struct protosw *pffindproto(int family, int protocol, int type);
   struct protosw *pffindtype(int family, int type);
   #endif
   
   #endif

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