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