sys/altq/altq_flowvalve.h

   1 /*      $NetBSD: altq_flowvalve.h,v 1.2.64.1 2006/03/18 12:08:18 peter Exp $    */
   2 /*      $KAME: altq_flowvalve.h,v 1.5 2002/04/03 05:38:50 kjc Exp $     */
   3
   4 /*
   5  * Copyright (C) 1998-2002
   6  *      Sony Computer Science Laboratories Inc.  All rights reserved.
   7  *
   8  * Redistribution and use in source and binary forms, with or without
   9  * modification, are permitted provided that the following conditions
  10  * are met:
  11  * 1. Redistributions of source code must retain the above copyright
  12  *    notice, this list of conditions and the following disclaimer.
  13  * 2. Redistributions in binary form must reproduce the above copyright
  14  *    notice, this list of conditions and the following disclaimer in the
  15  *    documentation and/or other materials provided with the distribution.
  16  *
  17  * THIS SOFTWARE IS PROVIDED BY SONY CSL AND CONTRIBUTORS ``AS IS'' AND
  18  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  19  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  20  * ARE DISCLAIMED.  IN NO EVENT SHALL SONY CSL OR CONTRIBUTORS BE LIABLE
  21  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  22  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  23  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  24  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  25  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  26  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  27  * SUCH DAMAGE.
  28  */
  29
  30 #ifndef _ALTQ_ALTQ_FLOWVALVE_H_
  31 #define _ALTQ_ALTQ_FLOWVALVE_H_
  32
  33 #ifdef _KERNEL
  34
  35 /* fv_flow structure to define a unique address pair */
  36 struct fv_flow {
  37         int flow_af;            /* address family */
  38         union {
  39                 struct {
  40                         struct in_addr ip_src;
  41                         struct in_addr ip_dst;
  42                 } _ip;
  43 #ifdef INET6
  44                 struct {
  45                         struct in6_addr ip6_src;
  46                         struct in6_addr ip6_dst;
  47                 } _ip6;
  48 #endif
  49         } flow_un;
  50 };
  51
  52 #define flow_ip         flow_un._ip
  53 #define flow_ip6        flow_un._ip6
  54
  55 /* flowvalve entry */
  56 struct fve {
  57         TAILQ_ENTRY(fve) fve_lru;       /* for LRU list */
  58
  59         enum fv_state { Green, Red } fve_state;
  60
  61         int     fve_p;                  /* scaled average drop rate */
  62         int     fve_f;                  /* scaled average fraction */
  63         int     fve_count;              /* counter to update f */
  64         u_int   fve_ifseq;              /* ifseq at the last update of f */
  65         struct timeval  fve_lastdrop;   /* timestamp of the last drop */
  66
  67         struct fv_flow fve_flow;        /* unique address pair */
  68 };
  69
  70 /* flowvalve structure */
  71 struct flowvalve {
  72         u_int   fv_ifseq;       /* packet sequence number */
  73         int     fv_flows;       /* number of valid flows in the flowlist */
  74         int     fv_pthresh;     /* drop rate threshold */
  75
  76         TAILQ_HEAD(fv_flowhead, fve) fv_flowlist;               /* LRU list */
  77
  78         struct fve *fv_fves;    /* pointer to the allocated fves */
  79
  80         int     *fv_p2ftab;     /* drop rate to fraction table */
  81
  82         struct {
  83                 u_int   pass;           /* # of packets that have the fve
  84                                            but aren't predropped */
  85                 u_int   predrop;        /* # of packets predropped */
  86                 u_int   alloc;          /* # of fves assigned */
  87                 u_int   escape;         /* # of fves escaped */
  88         } fv_stats;
  89 };
  90
  91 #endif /* _KERNEL */
  92
  93 #endif /* _ALTQ_ALTQ_FLOWVALVE_H_ */