1/*-
2 * Copyright (c) 2002 Andre Oppermann, Internet Business Solutions AG
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 *    notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 *    notice, this list of conditions and the following disclaimer in the
12 *    documentation and/or other materials provided with the distribution.
13 * 3. The name of the author may not be used to endorse or promote
14 *    products derived from this software without specific prior written
15 *    permission.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR 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 THE AUTHOR 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 * $FreeBSD: stable/11/sys/netinet/tcp_hostcache.h 369631 2021-04-16 22:12:37Z rscheff $
30 */
31
32/*
33 * Many thanks to jlemon for basic structure of tcp_syncache which is being
34 * followed here.
35 */
36
37#ifndef _NETINET_TCP_HOSTCACHE_H_
38#define _NETINET_TCP_HOSTCACHE_H_
39
40TAILQ_HEAD(hc_qhead, hc_metrics);
41
42struct hc_head {
43	struct hc_qhead	hch_bucket;
44	u_int		hch_length;
45	struct mtx	hch_mtx;
46};
47
48struct hc_metrics {
49	/* housekeeping */
50	TAILQ_ENTRY(hc_metrics) rmx_q;
51	struct	hc_head *rmx_head; /* head of bucket tail queue */
52	struct	in_addr ip4;	/* IP address */
53	struct	in6_addr ip6;	/* IP6 address */
54	uint32_t ip6_zoneid;	/* IPv6 scope zone id */
55	/* endpoint specific values for tcp */
56	u_long	rmx_mtu;	/* MTU for this path */
57	u_long	rmx_ssthresh;	/* outbound gateway buffer limit */
58	u_long	rmx_rtt;	/* estimated round trip time */
59	u_long	rmx_rttvar;	/* estimated rtt variance */
60	u_long	rmx_cwnd;	/* congestion window */
61	u_long	rmx_sendpipe;	/* outbound delay-bandwidth product */
62	u_long	rmx_recvpipe;	/* inbound delay-bandwidth product */
63	/* TCP hostcache internal data */
64	int	rmx_expire;	/* lifetime for object */
65	u_long	rmx_hits;	/* number of hits */
66	u_long	rmx_updates;	/* number of updates */
67};
68
69struct tcp_hostcache {
70	struct hc_head	*hashbase;
71	uma_zone_t	zone;
72	u_int		hashsize;
73	u_int		hashmask;
74	u_int		bucket_limit;
75	u_int		cache_count;
76	u_int		cache_limit;
77	int		expire;
78	int		prune;
79	int		purgeall;
80};
81
82#endif /* !_NETINET_TCP_HOSTCACHE_H_*/
83