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/*
* 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.
*
* $Id$
*/
#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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