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 * $FreeBSD$
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
42TAILQ_HEAD(hc_qhead, hc_metrics);
43
44struct hc_head {
45	struct hc_qhead	hch_bucket;
46	u_int		hch_length;
47	struct mtx	hch_mtx;
48};
49
50struct 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
71struct tcp_hostcache {
72	struct hc_head	*hashbase;
73	uma_zone_t	zone;
74	u_int		hashsize;
75	u_int		hashmask;
76	u_int		hashsalt;
77	u_int		bucket_limit;
78	u_int		cache_count;
79	u_int		cache_limit;
80	int		expire;
81	int		prune;
82	int		purgeall;
83};
84
85#endif /* !_NETINET_TCP_HOSTCACHE_H_*/
86