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Annotation of XNU/bsd/netinet/in_hostcache.h, revision 1.1

1.1     ! root        1: /*
        !             2:  * Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
        !             3:  *
        !             4:  * @APPLE_LICENSE_HEADER_START@
        !             5:  * 
        !             6:  * The contents of this file constitute Original Code as defined in and
        !             7:  * are subject to the Apple Public Source License Version 1.1 (the
        !             8:  * "License").  You may not use this file except in compliance with the
        !             9:  * License.  Please obtain a copy of the License at
        !            10:  * http://www.apple.com/publicsource and read it before using this file.
        !            11:  * 
        !            12:  * This Original Code and all software distributed under the License are
        !            13:  * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
        !            14:  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
        !            15:  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
        !            16:  * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT.  Please see the
        !            17:  * License for the specific language governing rights and limitations
        !            18:  * under the License.
        !            19:  * 
        !            20:  * @APPLE_LICENSE_HEADER_END@
        !            21:  */
        !            22: /*
        !            23:  * Copyright 1997 Massachusetts Institute of Technology
        !            24:  *
        !            25:  * Permission to use, copy, modify, and distribute this software and
        !            26:  * its documentation for any purpose and without fee is hereby
        !            27:  * granted, provided that both the above copyright notice and this
        !            28:  * permission notice appear in all copies, that both the above
        !            29:  * copyright notice and this permission notice appear in all
        !            30:  * supporting documentation, and that the name of M.I.T. not be used
        !            31:  * in advertising or publicity pertaining to distribution of the
        !            32:  * software without specific, written prior permission.  M.I.T. makes
        !            33:  * no representations about the suitability of this software for any
        !            34:  * purpose.  It is provided "as is" without express or implied
        !            35:  * warranty.
        !            36:  * 
        !            37:  * THIS SOFTWARE IS PROVIDED BY M.I.T. ``AS IS''.  M.I.T. DISCLAIMS
        !            38:  * ALL EXPRESS OR IMPLIED WARRANTIES WITH REGARD TO THIS SOFTWARE,
        !            39:  * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
        !            40:  * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. IN NO EVENT
        !            41:  * SHALL M.I.T. BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
        !            42:  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
        !            43:  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
        !            44:  * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
        !            45:  * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
        !            46:  * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
        !            47:  * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
        !            48:  * SUCH DAMAGE.
        !            49:  *
        !            50:  */
        !            51: 
        !            52: #ifndef _NETINET_IN_HOSTCACHE_H
        !            53: #define        _NETINET_IN_HOSTCACHE_H 1
        !            54: 
        !            55: /*
        !            56:  * This file defines the particular structures contained in the host cache
        !            57:  * for the use of IP.
        !            58:  */
        !            59: 
        !            60: /*
        !            61:  * An IP host cache entry.  Note that we include the srtt/var here,
        !            62:  * with the expectation that it might be used to keep a persistent,
        !            63:  * cross-connection view of this statistic.
        !            64:  */
        !            65: struct in_hcentry {
        !            66:        struct  hcentry inhc_hc;
        !            67:        u_long  inhc_pmtu;
        !            68:        u_long  inhc_recvpipe;
        !            69:        u_long  inhc_sendpipe;
        !            70:        u_long  inhc_pksent;
        !            71:        u_long  inhc_flags;
        !            72:        u_long  inhc_ssthresh;
        !            73:        int     inhc_srtt;      /* VJ RTT estimator */
        !            74:        int     inhc_srttvar;   /* VJ */
        !            75:        u_int   inhc_rttmin;    /* VJ */
        !            76:        int     inhc_rxt;       /* TCP retransmit timeout */
        !            77:        u_long  inhc_cc;        /* deliberate type pun with tcp_cc */
        !            78:        u_long  inhc_ccsent;    /* as above */
        !            79:        u_short inhc_mssopt;
        !            80: };
        !            81: 
        !            82: #define        inhc_addr(inhc) ((struct sockaddr_in *)(inhc)->inhc_hc.hc_host)
        !            83: 
        !            84: /* Flags for inhc_flags... */
        !            85: #define        INHC_LOCAL      0x0001  /* this address is local */
        !            86: #define        INHC_BROADCAST  0x0002  /* this address is broadcast */
        !            87: #define        INHC_MULTICAST  0x0004  /* this address is multicast */
        !            88: #define        INHC_REDUCEDMTU 0x0008  /* we reduced the mtu via PMTU discovery */
        !            89: 
        !            90: #ifdef KERNEL
        !            91: /*
        !            92:  * inhc_alloc can block while adding a new entry to the cache;
        !            93:  * inhc_lookup will does not add new entries and so can be called
        !            94:  * in non-process context.
        !            95:  */
        !            96: struct in_hcentry *inhc_alloc(struct sockaddr_in *sin);
        !            97: int    inhc_init(void);
        !            98: struct in_hcentry *inhc_lookup(struct sockaddr_in *sin);
        !            99: #define        inhc_ref(inhc)  (hc_ref(&(inhc)->inhc_hc))
        !           100: #define        inhc_rele(inhc) (hc_rele(&(inhc)->inhc_hc))
        !           101: #endif /* KERNEL */
        !           102: 
        !           103: #endif /* _NETINET_IN_HOSTCACHE_H */

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