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

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    1 /*
    2  * Copyright 1997 Massachusetts Institute of Technology
    3  *
    4  * Permission to use, copy, modify, and distribute this software and
    5  * its documentation for any purpose and without fee is hereby
    6  * granted, provided that both the above copyright notice and this
    7  * permission notice appear in all copies, that both the above
    8  * copyright notice and this permission notice appear in all
    9  * supporting documentation, and that the name of M.I.T. not be used
   10  * in advertising or publicity pertaining to distribution of the
   11  * software without specific, written prior permission.  M.I.T. makes
   12  * no representations about the suitability of this software for any
   13  * purpose.  It is provided "as is" without express or implied
   14  * warranty.
   15  * 
   16  * THIS SOFTWARE IS PROVIDED BY M.I.T. ``AS IS''.  M.I.T. DISCLAIMS
   17  * ALL EXPRESS OR IMPLIED WARRANTIES WITH REGARD TO THIS SOFTWARE,
   18  * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
   19  * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. IN NO EVENT
   20  * SHALL M.I.T. BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
   21  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
   22  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
   23  * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
   24  * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
   25  * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
   26  * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   27  * SUCH DAMAGE.
   28  *
   29  * $FreeBSD: src/sys/netinet/in_hostcache.h,v 1.1.4.1 1999/08/29 16:29:35 peter Exp $
   30  */
   31 
   32 #ifndef _NETINET_IN_HOSTCACHE_H
   33 #define _NETINET_IN_HOSTCACHE_H 1
   34 
   35 /*
   36  * This file defines the particular structures contained in the host cache
   37  * for the use of IP.
   38  */
   39 
   40 /*
   41  * An IP host cache entry.  Note that we include the srtt/var here,
   42  * with the expectation that it might be used to keep a persistent,
   43  * cross-connection view of this statistic.
   44  */
   45 struct in_hcentry {
   46         struct  hcentry inhc_hc;
   47         u_long  inhc_pmtu;
   48         u_long  inhc_recvpipe;
   49         u_long  inhc_sendpipe;
   50         u_long  inhc_pksent;
   51         u_long  inhc_flags;
   52         u_long  inhc_ssthresh;
   53         int     inhc_srtt;      /* VJ RTT estimator */
   54         int     inhc_srttvar;   /* VJ */
   55         u_int   inhc_rttmin;    /* VJ */
   56         int     inhc_rxt;       /* TCP retransmit timeout */
   57         u_long  inhc_cc;        /* deliberate type pun with tcp_cc */
   58         u_long  inhc_ccsent;    /* as above */
   59         u_short inhc_mssopt;
   60 };
   61 
   62 #define inhc_addr(inhc) ((struct sockaddr_in *)(inhc)->inhc_hc.hc_host)
   63 
   64 /* Flags for inhc_flags... */
   65 #define INHC_LOCAL      0x0001  /* this address is local */
   66 #define INHC_BROADCAST  0x0002  /* this address is broadcast */
   67 #define INHC_MULTICAST  0x0004  /* this address is multicast */
   68 #define INHC_REDUCEDMTU 0x0008  /* we reduced the mtu via PMTU discovery */
   69 
   70 #ifdef KERNEL
   71 /*
   72  * inhc_alloc can block while adding a new entry to the cache;
   73  * inhc_lookup will does not add new entries and so can be called
   74  * in non-process context.
   75  */
   76 struct  in_hcentry *inhc_alloc(struct sockaddr_in *sin);
   77 int     inhc_init(void);
   78 struct  in_hcentry *inhc_lookup(struct sockaddr_in *sin);
   79 #define inhc_ref(inhc)  (hc_ref(&(inhc)->inhc_hc))
   80 #define inhc_rele(inhc) (hc_rele(&(inhc)->inhc_hc))
   81 #endif /* KERNEL */
   82 
   83 #endif /* _NETINET_IN_HOSTCACHE_H */

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