sys/netinet/in_hostcache.h

   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 1.3 1999/12/29 04:40:59 peter Exp $
  30  * $DragonFly: src/sys/netinet/Attic/in_hostcache.h,v 1.4 2006/05/20 02:42:12 dillon Exp $
  31  */
  32
  33 #ifndef _NETINET_IN_HOSTCACHE_H
  34 #define _NETINET_IN_HOSTCACHE_H
  35
  36 #ifndef _NET_HOSTCACHE_H_
  37 #include <net/hostcache.h>
  38 #endif
  39
  40 /*
  41  * This file defines the particular structures contained in the host cache
  42  * for the use of IP.
  43  */
  44
  45 /*
  46  * An IP host cache entry.  Note that we include the srtt/var here,
  47  * with the expectation that it might be used to keep a persistent,
  48  * cross-connection view of this statistic.
  49  */
  50 struct in_hcentry {
  51         struct  hcentry inhc_hc;
  52         u_long  inhc_pmtu;
  53         u_long  inhc_recvpipe;
  54         u_long  inhc_sendpipe;
  55         u_long  inhc_pksent;
  56         u_long  inhc_flags;
  57         u_long  inhc_ssthresh;
  58         int     inhc_srtt;      /* VJ RTT estimator */
  59         int     inhc_srttvar;   /* VJ */
  60         u_int   inhc_rttmin;    /* VJ */
  61         int     inhc_rxt;       /* TCP retransmit timeout */
  62         u_long  inhc_cc;        /* deliberate type pun with tcp_cc */
  63         u_long  inhc_ccsent;    /* as above */
  64         u_short inhc_mssopt;
  65 };
  66
  67 struct sockaddr_in;
  68
  69 #define inhc_addr(inhc) ((struct sockaddr_in *)(inhc)->inhc_hc.hc_host)
  70
  71 /* Flags for inhc_flags... */
  72 #define INHC_LOCAL      0x0001  /* this address is local */
  73 #define INHC_BROADCAST  0x0002  /* this address is broadcast */
  74 #define INHC_MULTICAST  0x0004  /* this address is multicast */
  75 #define INHC_REDUCEDMTU 0x0008  /* we reduced the mtu via PMTU discovery */
  76
  77 #ifdef _KERNEL
  78 /*
  79  * inhc_alloc can block while adding a new entry to the cache;
  80  * inhc_lookup will does not add new entries and so can be called
  81  * in non-process context.
  82  */
  83 struct  in_hcentry *inhc_alloc(struct sockaddr_in *sin);
  84 int     inhc_init(void);
  85 struct  in_hcentry *inhc_lookup(struct sockaddr_in *sin);
  86 #define inhc_ref(inhc)  (hc_ref(&(inhc)->inhc_hc))
  87 #define inhc_rele(inhc) (hc_rele(&(inhc)->inhc_hc))
  88 #endif
  89
  90 #endif /* _NETINET_IN_HOSTCACHE_H */