| 1 | /* $NetBSD: tcp_congctl.h,v 1.7 2013/11/12 09:02:05 kefren 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 | * |
| 19 | * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS |
| 20 | * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED |
| 21 | * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR |
| 22 | * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS |
| 23 | * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR |
| 24 | * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF |
| 25 | * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS |
| 26 | * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN |
| 27 | * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) |
| 28 | * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE |
| 29 | * POSSIBILITY OF SUCH DAMAGE. |
| 30 | */ |
| 31 | |
| 32 | #ifndef _NETINET_TCP_CONGCTL_H |
| 33 | #define _NETINET_TCP_CONGCTL_H |
| 34 | |
| 35 | #define TCPCC_MAXLEN 12 |
| 36 | |
| 37 | struct tcp_congctlent { |
| 38 | TAILQ_ENTRY(tcp_congctlent) congctl_ent; |
| 39 | const struct tcp_congctl *congctl_ctl; |
| 40 | unsigned int congctl_refcnt; |
| 41 | char congctl_name[TCPCC_MAXLEN]; |
| 42 | }; |
| 43 | /* |
| 44 | * Congestion control function table. |
| 45 | */ |
| 46 | struct tcp_congctl { |
| 47 | /* |
| 48 | * fast_retransmit: called on tcprexmtthresh'th dup ACKs. |
| 49 | * this actually retransmits packets by calling tcp_output() |
| 50 | * if appropriate. |
| 51 | * returns 0 if entering fast recovery. otherwise returns non-0. |
| 52 | */ |
| 53 | int (*fast_retransmit)(struct tcpcb *, const struct tcphdr *); |
| 54 | |
| 55 | /* |
| 56 | * slow_retransmit: called on RTO to adjust parameters like cwnd. |
| 57 | */ |
| 58 | void (*slow_retransmit)(struct tcpcb *); |
| 59 | |
| 60 | /* |
| 61 | * fast_retransmit_newack: called when new data is acked. |
| 62 | * ie. when advancing SND.UNA |
| 63 | * not called if TCP_SACK_ENABLED. |
| 64 | */ |
| 65 | void (*fast_retransmit_newack)(struct tcpcb *, const struct tcphdr *); |
| 66 | |
| 67 | /* |
| 68 | * newack: called when new data is acked. ie. when advancing SND.UNA |
| 69 | * it's called before updating tp->snd_una. |
| 70 | */ |
| 71 | void (*newack)(struct tcpcb *, const struct tcphdr *); |
| 72 | |
| 73 | /* |
| 74 | * cong_exp: called when congestion is detected. eg. by ECN |
| 75 | */ |
| 76 | void (*cong_exp)(struct tcpcb *); |
| 77 | }; |
| 78 | |
| 79 | extern const struct tcp_congctl tcp_reno_ctl; |
| 80 | extern const struct tcp_congctl tcp_newreno_ctl; |
| 81 | extern const struct tcp_congctl tcp_cubic_ctl; |
| 82 | |
| 83 | /* currently selected global congestion control */ |
| 84 | extern char tcp_congctl_global_name[TCPCC_MAXLEN]; |
| 85 | |
| 86 | /* available global congestion control algorithms */ |
| 87 | extern char tcp_congctl_avail[10 * TCPCC_MAXLEN]; |
| 88 | |
| 89 | void tcp_congctl_init(void); |
| 90 | int tcp_congctl_register(const char *, const struct tcp_congctl *); |
| 91 | int tcp_congctl_unregister(const char *); |
| 92 | int tcp_congctl_select(struct tcpcb *, const char *); |
| 93 | void tcp_congctl_release(struct tcpcb *); |
| 94 | const char * |
| 95 | tcp_congctl_bystruct(const struct tcp_congctl *); |
| 96 | |
| 97 | #endif /* _NETINET_TCP_CONGCTL_H */ |
| 98 | |