1 /* $NetBSD: tcp_congctl.h,v 1.3 2006/10/21 10:24:47 yamt Exp $ */
2
3 /*
4 * Copyright (c) 2006 The NetBSD Foundation, Inc.
5 * All rights reserved.
6 *
7 * This code is derived from software contributed to The NetBSD Foundation
8 * by Rui Paulo.
9 *
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
12 * are met:
13 * 1. Redistributions of source code must retain the above copyright
14 * notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 * notice, this list of conditions and the following disclaimer in the
17 * documentation and/or other materials provided with the distribution.
18 * 3. All advertising materials mentioning features or use of this software
19 * must display the following acknowledgement:
20 * This product includes software developed by the NetBSD
21 * Foundation, Inc. and its contributors.
22 * 4. Neither the name of The NetBSD Foundation nor the names of its
23 * contributors may be used to endorse or promote products derived
24 * from this software without specific prior written permission.
25 *
26 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
27 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
28 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
29 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
30 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
31 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
32 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
33 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
34 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
35 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
36 * POSSIBILITY OF SUCH DAMAGE.
37 */
38
39 #ifndef _NETINET_TCP_CONGCTL_H
40 #define _NETINET_TCP_CONGCTL_H
41
42 /*
43 * Congestion control function table.
44 */
45 struct tcp_congctl {
46 int (*fast_retransmit)(struct tcpcb *, const struct tcphdr *);
47 void (*slow_retransmit)(struct tcpcb *);
48 void (*fast_retransmit_newack)(struct tcpcb *, const struct tcphdr *);
49 void (*newack)(struct tcpcb *, const struct tcphdr *);
50 void (*cong_exp)(struct tcpcb *);
51
52 uint32_t refcnt;
53 };
54
55 extern struct tcp_congctl tcp_reno_ctl;
56 extern struct tcp_congctl tcp_newreno_ctl;
57
58 extern struct simplelock tcp_congctl_slock;
59
60 #define TCPCC_MAXLEN 12
61
62 /* currently selected global congestion control */
63 struct tcp_congctl *tcp_congctl_global;
64 char tcp_congctl_global_name[TCPCC_MAXLEN];
65
66 /* available global congestion control algorithms */
67 char tcp_congctl_avail[10 * TCPCC_MAXLEN];
68
69 void tcp_congctl_init(void);
70 int tcp_congctl_register(const char *, struct tcp_congctl *);
71 int tcp_congctl_unregister(const char *);
72 int tcp_congctl_select(struct tcpcb *, const char *);
73 const char *
74 tcp_congctl_bystruct(const struct tcp_congctl *);
75
76 #endif /* _NETINET_TCP_CONGCTL_H */
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