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Annotation of Net2/sys/protosw.h, revision 1.1

1.1     ! root        1: /*-
        !             2:  * Copyright (c) 1982, 1986 The Regents of the University of California.
        !             3:  * All rights reserved.
        !             4:  *
        !             5:  * Redistribution and use in source and binary forms, with or without
        !             6:  * modification, are permitted provided that the following conditions
        !             7:  * are met:
        !             8:  * 1. Redistributions of source code must retain the above copyright
        !             9:  *    notice, this list of conditions and the following disclaimer.
        !            10:  * 2. Redistributions in binary form must reproduce the above copyright
        !            11:  *    notice, this list of conditions and the following disclaimer in the
        !            12:  *    documentation and/or other materials provided with the distribution.
        !            13:  * 3. All advertising materials mentioning features or use of this software
        !            14:  *    must display the following acknowledgement:
        !            15:  *     This product includes software developed by the University of
        !            16:  *     California, Berkeley and its contributors.
        !            17:  * 4. Neither the name of the University nor the names of its contributors
        !            18:  *    may be used to endorse or promote products derived from this software
        !            19:  *    without specific prior written permission.
        !            20:  *
        !            21:  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
        !            22:  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
        !            23:  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
        !            24:  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
        !            25:  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
        !            26:  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
        !            27:  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
        !            28:  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
        !            29:  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
        !            30:  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
        !            31:  * SUCH DAMAGE.
        !            32:  *
        !            33:  *     @(#)protosw.h   7.8 (Berkeley) 4/28/91
        !            34:  */
        !            35: 
        !            36: /*
        !            37:  * Protocol switch table.
        !            38:  *
        !            39:  * Each protocol has a handle initializing one of these structures,
        !            40:  * which is used for protocol-protocol and system-protocol communication.
        !            41:  *
        !            42:  * A protocol is called through the pr_init entry before any other.
        !            43:  * Thereafter it is called every 200ms through the pr_fasttimo entry and
        !            44:  * every 500ms through the pr_slowtimo for timer based actions.
        !            45:  * The system will call the pr_drain entry if it is low on space and
        !            46:  * this should throw away any non-critical data.
        !            47:  *
        !            48:  * Protocols pass data between themselves as chains of mbufs using
        !            49:  * the pr_input and pr_output hooks.  Pr_input passes data up (towards
        !            50:  * UNIX) and pr_output passes it down (towards the imps); control
        !            51:  * information passes up and down on pr_ctlinput and pr_ctloutput.
        !            52:  * The protocol is responsible for the space occupied by any the
        !            53:  * arguments to these entries and must dispose it.
        !            54:  *
        !            55:  * The userreq routine interfaces protocols to the system and is
        !            56:  * described below.
        !            57:  */
        !            58: struct protosw {
        !            59:        short   pr_type;                /* socket type used for */
        !            60:        struct  domain *pr_domain;      /* domain protocol a member of */
        !            61:        short   pr_protocol;            /* protocol number */
        !            62:        short   pr_flags;               /* see below */
        !            63: /* protocol-protocol hooks */
        !            64:        int     (*pr_input)();          /* input to protocol (from below) */
        !            65:        int     (*pr_output)();         /* output to protocol (from above) */
        !            66:        int     (*pr_ctlinput)();       /* control input (from below) */
        !            67:        int     (*pr_ctloutput)();      /* control output (from above) */
        !            68: /* user-protocol hook */
        !            69:        int     (*pr_usrreq)();         /* user request: see list below */
        !            70: /* utility hooks */
        !            71:        int     (*pr_init)();           /* initialization hook */
        !            72:        int     (*pr_fasttimo)();       /* fast timeout (200ms) */
        !            73:        int     (*pr_slowtimo)();       /* slow timeout (500ms) */
        !            74:        int     (*pr_drain)();          /* flush any excess space possible */
        !            75: };
        !            76: 
        !            77: #define        PR_SLOWHZ       2               /* 2 slow timeouts per second */
        !            78: #define        PR_FASTHZ       5               /* 5 fast timeouts per second */
        !            79: 
        !            80: /*
        !            81:  * Values for pr_flags.
        !            82:  * PR_ADDR requires PR_ATOMIC;
        !            83:  * PR_ADDR and PR_CONNREQUIRED are mutually exclusive.
        !            84:  */
        !            85: #define        PR_ATOMIC       0x01            /* exchange atomic messages only */
        !            86: #define        PR_ADDR         0x02            /* addresses given with messages */
        !            87: #define        PR_CONNREQUIRED 0x04            /* connection required by protocol */
        !            88: #define        PR_WANTRCVD     0x08            /* want PRU_RCVD calls */
        !            89: #define        PR_RIGHTS       0x10            /* passes capabilities */
        !            90: 
        !            91: /*
        !            92:  * The arguments to usrreq are:
        !            93:  *     (*protosw[].pr_usrreq)(up, req, m, nam, opt);
        !            94:  * where up is a (struct socket *), req is one of these requests,
        !            95:  * m is a optional mbuf chain containing a message,
        !            96:  * nam is an optional mbuf chain containing an address,
        !            97:  * and opt is a pointer to a socketopt structure or nil.
        !            98:  * The protocol is responsible for disposal of the mbuf chain m,
        !            99:  * the caller is responsible for any space held by nam and opt.
        !           100:  * A non-zero return from usrreq gives an
        !           101:  * UNIX error number which should be passed to higher level software.
        !           102:  */
        !           103: #define        PRU_ATTACH              0       /* attach protocol to up */
        !           104: #define        PRU_DETACH              1       /* detach protocol from up */
        !           105: #define        PRU_BIND                2       /* bind socket to address */
        !           106: #define        PRU_LISTEN              3       /* listen for connection */
        !           107: #define        PRU_CONNECT             4       /* establish connection to peer */
        !           108: #define        PRU_ACCEPT              5       /* accept connection from peer */
        !           109: #define        PRU_DISCONNECT          6       /* disconnect from peer */
        !           110: #define        PRU_SHUTDOWN            7       /* won't send any more data */
        !           111: #define        PRU_RCVD                8       /* have taken data; more room now */
        !           112: #define        PRU_SEND                9       /* send this data */
        !           113: #define        PRU_ABORT               10      /* abort (fast DISCONNECT, DETATCH) */
        !           114: #define        PRU_CONTROL             11      /* control operations on protocol */
        !           115: #define        PRU_SENSE               12      /* return status into m */
        !           116: #define        PRU_RCVOOB              13      /* retrieve out of band data */
        !           117: #define        PRU_SENDOOB             14      /* send out of band data */
        !           118: #define        PRU_SOCKADDR            15      /* fetch socket's address */
        !           119: #define        PRU_PEERADDR            16      /* fetch peer's address */
        !           120: #define        PRU_CONNECT2            17      /* connect two sockets */
        !           121: /* begin for protocols internal use */
        !           122: #define        PRU_FASTTIMO            18      /* 200ms timeout */
        !           123: #define        PRU_SLOWTIMO            19      /* 500ms timeout */
        !           124: #define        PRU_PROTORCV            20      /* receive from below */
        !           125: #define        PRU_PROTOSEND           21      /* send to below */
        !           126: 
        !           127: #define        PRU_NREQ                21
        !           128: 
        !           129: #ifdef PRUREQUESTS
        !           130: char *prurequests[] = {
        !           131:        "ATTACH",       "DETACH",       "BIND",         "LISTEN",
        !           132:        "CONNECT",      "ACCEPT",       "DISCONNECT",   "SHUTDOWN",
        !           133:        "RCVD",         "SEND",         "ABORT",        "CONTROL",
        !           134:        "SENSE",        "RCVOOB",       "SENDOOB",      "SOCKADDR",
        !           135:        "PEERADDR",     "CONNECT2",     "FASTTIMO",     "SLOWTIMO",
        !           136:        "PROTORCV",     "PROTOSEND",
        !           137: };
        !           138: #endif
        !           139: 
        !           140: /*
        !           141:  * The arguments to the ctlinput routine are
        !           142:  *     (*protosw[].pr_ctlinput)(cmd, sa, arg);
        !           143:  * where cmd is one of the commands below, sa is a pointer to a sockaddr,
        !           144:  * and arg is an optional caddr_t argument used within a protocol family.
        !           145:  */
        !           146: #define        PRC_IFDOWN              0       /* interface transition */
        !           147: #define        PRC_ROUTEDEAD           1       /* select new route if possible ??? */
        !           148: #define        PRC_QUENCH2             3       /* DEC congestion bit says slow down */
        !           149: #define        PRC_QUENCH              4       /* some one said to slow down */
        !           150: #define        PRC_MSGSIZE             5       /* message size forced drop */
        !           151: #define        PRC_HOSTDEAD            6       /* host appears to be down */
        !           152: #define        PRC_HOSTUNREACH         7       /* deprecated (use PRC_UNREACH_HOST) */
        !           153: #define        PRC_UNREACH_NET         8       /* no route to network */
        !           154: #define        PRC_UNREACH_HOST        9       /* no route to host */
        !           155: #define        PRC_UNREACH_PROTOCOL    10      /* dst says bad protocol */
        !           156: #define        PRC_UNREACH_PORT        11      /* bad port # */
        !           157: /* was PRC_UNREACH_NEEDFRAG    12         (use PRC_MSGSIZE) */
        !           158: #define        PRC_UNREACH_SRCFAIL     13      /* source route failed */
        !           159: #define        PRC_REDIRECT_NET        14      /* net routing redirect */
        !           160: #define        PRC_REDIRECT_HOST       15      /* host routing redirect */
        !           161: #define        PRC_REDIRECT_TOSNET     16      /* redirect for type of service & net */
        !           162: #define        PRC_REDIRECT_TOSHOST    17      /* redirect for tos & host */
        !           163: #define        PRC_TIMXCEED_INTRANS    18      /* packet lifetime expired in transit */
        !           164: #define        PRC_TIMXCEED_REASS      19      /* lifetime expired on reass q */
        !           165: #define        PRC_PARAMPROB           20      /* header incorrect */
        !           166: 
        !           167: #define        PRC_NCMDS               21
        !           168: 
        !           169: #define        PRC_IS_REDIRECT(cmd)    \
        !           170:        ((cmd) >= PRC_REDIRECT_NET && (cmd) <= PRC_REDIRECT_TOSHOST)
        !           171: 
        !           172: #ifdef PRCREQUESTS
        !           173: char   *prcrequests[] = {
        !           174:        "IFDOWN", "ROUTEDEAD", "#2", "DEC-BIT-QUENCH2",
        !           175:        "QUENCH", "MSGSIZE", "HOSTDEAD", "#7",
        !           176:        "NET-UNREACH", "HOST-UNREACH", "PROTO-UNREACH", "PORT-UNREACH",
        !           177:        "#12", "SRCFAIL-UNREACH", "NET-REDIRECT", "HOST-REDIRECT",
        !           178:        "TOSNET-REDIRECT", "TOSHOST-REDIRECT", "TX-INTRANS", "TX-REASS",
        !           179:        "PARAMPROB"
        !           180: };
        !           181: #endif
        !           182: 
        !           183: /*
        !           184:  * The arguments to ctloutput are:
        !           185:  *     (*protosw[].pr_ctloutput)(req, so, level, optname, optval);
        !           186:  * req is one of the actions listed below, so is a (struct socket *),
        !           187:  * level is an indication of which protocol layer the option is intended.
        !           188:  * optname is a protocol dependent socket option request,
        !           189:  * optval is a pointer to a mbuf-chain pointer, for value-return results.
        !           190:  * The protocol is responsible for disposal of the mbuf chain *optval
        !           191:  * if supplied,
        !           192:  * the caller is responsible for any space held by *optval, when returned.
        !           193:  * A non-zero return from usrreq gives an
        !           194:  * UNIX error number which should be passed to higher level software.
        !           195:  */
        !           196: #define        PRCO_GETOPT     0
        !           197: #define        PRCO_SETOPT     1
        !           198: 
        !           199: #define        PRCO_NCMDS      2
        !           200: 
        !           201: #ifdef PRCOREQUESTS
        !           202: char   *prcorequests[] = {
        !           203:        "GETOPT", "SETOPT",
        !           204: };
        !           205: #endif
        !           206: 
        !           207: #ifdef KERNEL
        !           208: extern struct protosw *pffindproto(), *pffindtype();
        !           209: #endif

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