The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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

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    1 /*-
    2  * SPDX-License-Identifier: BSD-3-Clause
    3  *
    4  * Copyright (c) 2002 Andre Oppermann, Internet Business Solutions AG
    5  * All rights reserved.
    6  *
    7  * Redistribution and use in source and binary forms, with or without
    8  * modification, are permitted provided that the following conditions
    9  * are met:
   10  * 1. Redistributions of source code must retain the above copyright
   11  *    notice, this list of conditions and the following disclaimer.
   12  * 2. Redistributions in binary form must reproduce the above copyright
   13  *    notice, this list of conditions and the following disclaimer in the
   14  *    documentation and/or other materials provided with the distribution.
   15  * 3. The name of the author may not be used to endorse or promote
   16  *    products derived from this software without specific prior written
   17  *    permission.
   18  *
   19  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
   20  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   21  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   22  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
   23  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   24  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   25  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   26  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   27  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   28  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   29  * SUCH DAMAGE.
   30  *
   31  * $FreeBSD: releng/12.0/sys/netinet/tcp_hostcache.h 326272 2017-11-27 15:23:17Z pfg $
   32  */
   33 
   34 /*
   35  * Many thanks to jlemon for basic structure of tcp_syncache which is being
   36  * followed here.
   37  */
   38 
   39 #ifndef _NETINET_TCP_HOSTCACHE_H_
   40 #define _NETINET_TCP_HOSTCACHE_H_
   41 
   42 TAILQ_HEAD(hc_qhead, hc_metrics);
   43 
   44 struct hc_head {
   45         struct hc_qhead hch_bucket;
   46         u_int           hch_length;
   47         struct mtx      hch_mtx;
   48 };
   49 
   50 struct hc_metrics {
   51         /* housekeeping */
   52         TAILQ_ENTRY(hc_metrics) rmx_q;
   53         struct          hc_head *rmx_head; /* head of bucket tail queue */
   54         struct          in_addr ip4;    /* IP address */
   55         struct          in6_addr ip6;   /* IP6 address */
   56         uint32_t        ip6_zoneid;     /* IPv6 scope zone id */
   57         /* endpoint specific values for tcp */
   58         uint32_t        rmx_mtu;        /* MTU for this path */
   59         uint32_t        rmx_ssthresh;   /* outbound gateway buffer limit */
   60         uint32_t        rmx_rtt;        /* estimated round trip time */
   61         uint32_t        rmx_rttvar;     /* estimated rtt variance */
   62         uint32_t        rmx_cwnd;       /* congestion window */
   63         uint32_t        rmx_sendpipe;   /* outbound delay-bandwidth product */
   64         uint32_t        rmx_recvpipe;   /* inbound delay-bandwidth product */
   65         /* TCP hostcache internal data */
   66         int             rmx_expire;     /* lifetime for object */
   67         u_long          rmx_hits;       /* number of hits */
   68         u_long          rmx_updates;    /* number of updates */
   69 };
   70 
   71 struct tcp_hostcache {
   72         struct  hc_head *hashbase;
   73         uma_zone_t zone;
   74         u_int   hashsize;
   75         u_int   hashmask;
   76         u_int   bucket_limit;
   77         u_int   cache_count;
   78         u_int   cache_limit;
   79         int     expire;
   80         int     prune;
   81         int     purgeall;
   82 };
   83 
   84 #endif /* !_NETINET_TCP_HOSTCACHE_H_*/

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