FreeBSD/Linux Kernel Cross Reference
sys/netinet/in_hostcache.h

     /*
      * Copyright 1997 Massachusetts Institute of Technology
      *
      * Permission to use, copy, modify, and distribute this software and
      * its documentation for any purpose and without fee is hereby
      * granted, provided that both the above copyright notice and this
      * permission notice appear in all copies, that both the above
      * copyright notice and this permission notice appear in all
      * supporting documentation, and that the name of M.I.T. not be used
     * in advertising or publicity pertaining to distribution of the
     * software without specific, written prior permission.  M.I.T. makes
     * no representations about the suitability of this software for any
     * purpose.  It is provided "as is" without express or implied
     * warranty.
     * 
     * THIS SOFTWARE IS PROVIDED BY M.I.T. ``AS IS''.  M.I.T. DISCLAIMS
     * ALL EXPRESS OR IMPLIED WARRANTIES WITH REGARD TO THIS SOFTWARE,
     * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
     * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. IN NO EVENT
     * SHALL M.I.T. 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.
     *
     * $FreeBSD$
     */
    
    #ifndef _NETINET_IN_HOSTCACHE_H
    #define _NETINET_IN_HOSTCACHE_H 1
    
    /*
     * This file defines the particular structures contained in the host cache
     * for the use of IP.
     */
    
    /*
     * An IP host cache entry.  Note that we include the srtt/var here,
     * with the expectation that it might be used to keep a persistent,
     * cross-connection view of this statistic.
     */
    struct in_hcentry {
            struct  hcentry inhc_hc;
            u_long  inhc_pmtu;
            u_long  inhc_recvpipe;
            u_long  inhc_sendpipe;
            u_long  inhc_pksent;
            u_long  inhc_flags;
            u_long  inhc_ssthresh;
            int     inhc_srtt;      /* VJ RTT estimator */
            int     inhc_srttvar;   /* VJ */
            u_int   inhc_rttmin;    /* VJ */
            int     inhc_rxt;       /* TCP retransmit timeout */
            u_long  inhc_cc;        /* deliberate type pun with tcp_cc */
            u_long  inhc_ccsent;    /* as above */
            u_short inhc_mssopt;
    };
    
    #define inhc_addr(inhc) ((struct sockaddr_in *)(inhc)->inhc_hc.hc_host)
    
    /* Flags for inhc_flags... */
    #define INHC_LOCAL      0x0001  /* this address is local */
    #define INHC_BROADCAST  0x0002  /* this address is broadcast */
    #define INHC_MULTICAST  0x0004  /* this address is multicast */
    #define INHC_REDUCEDMTU 0x0008  /* we reduced the mtu via PMTU discovery */
    
    #ifdef KERNEL
    /*
     * inhc_alloc can block while adding a new entry to the cache;
     * inhc_lookup will does not add new entries and so can be called
     * in non-process context.
     */
    struct  in_hcentry *inhc_alloc(struct sockaddr_in *sin);
    int     inhc_init(void);
    struct  in_hcentry *inhc_lookup(struct sockaddr_in *sin);
    #define inhc_ref(inhc)  (hc_ref(&(inhc)->inhc_hc))
    #define inhc_rele(inhc) (hc_rele(&(inhc)->inhc_hc))
    #endif /* KERNEL */
    
    #endif /* _NETINET_IN_HOSTCACHE_H */

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