1/* 2 * Copyright (c) 2010-2011 Apple Inc. All rights reserved. 3 * 4 * @APPLE_OSREFERENCE_LICENSE_HEADER_START@ 5 * 6 * This file contains Original Code and/or Modifications of Original Code 7 * as defined in and that are subject to the Apple Public Source License 8 * Version 2.0 (the 'License'). You may not use this file except in 9 * compliance with the License. The rights granted to you under the License 10 * may not be used to create, or enable the creation or redistribution of, 11 * unlawful or unlicensed copies of an Apple operating system, or to 12 * circumvent, violate, or enable the circumvention or violation of, any 13 * terms of an Apple operating system software license agreement. 14 * 15 * Please obtain a copy of the License at 16 * http://www.opensource.apple.com/apsl/ and read it before using this file. 17 * 18 * The Original Code and all software distributed under the License are 19 * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER 20 * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES, 21 * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY, 22 * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT. 23 * Please see the License for the specific language governing rights and 24 * limitations under the License. 25 * 26 * @APPLE_OSREFERENCE_LICENSE_HEADER_END@ 27 */ 28/*- 29 * Copyright (c) 2008 Swinburne University of Technology, Melbourne, Australia 30 * All rights reserved. 31 * 32 * This software was developed at the Centre for Advanced Internet 33 * Architectures, Swinburne University, by Lawrence Stewart and James Healy, 34 * made possible in part by a grant from the Cisco University Research Program 35 * Fund at Community Foundation Silicon Valley. 36 * 37 * Redistribution and use in source and binary forms, with or without 38 * modification, are permitted provided that the following conditions 39 * are met: 40 * 1. Redistributions of source code must retain the above copyright 41 * notice, this list of conditions and the following disclaimer. 42 * 2. Redistributions in binary form must reproduce the above copyright 43 * notice, this list of conditions and the following disclaimer in the 44 * documentation and/or other materials provided with the distribution. 45 * 46 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 47 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 48 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 49 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 50 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 51 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 52 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 53 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 54 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 55 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 56 * SUCH DAMAGE. 57 * 58 * $FreeBSD$ 59 */ 60 61#ifndef _NETINET_CC_H_ 62#define _NETINET_CC_H_ 63 64#ifdef KERNEL 65 66#include <netinet/tcp_var.h> 67 68#define TCP_CC_ALGO_NEWRENO_INDEX 0 /* default congestion control algorithm */ 69#define TCP_CC_ALGO_BACKGROUND_INDEX 1 /* congestion control for background transport */ 70#define TCP_CC_ALGO_COUNT 2 /* Count of CC algorithms defined */ 71 72#define TCP_CA_NAME_MAX 16 /* Maximum characters in the name of a CC algorithm */ 73 74/* 75 * Structure to hold definition various actions defined by a congestion control 76 * algorithm for TCP. This can be used to change the congestion control on a 77 * connection based on the user settings of priority of a connection. 78 */ 79struct tcp_cc_algo { 80 char name[TCP_CA_NAME_MAX]; 81 uint32_t num_sockets; 82 uint32_t flags; 83 84 /* init the congestion algorithm for the specified control block */ 85 int (*init) (struct tcpcb *tp); 86 87 /* cleanup any state that is stored in the connection related to the algorithm */ 88 int (*cleanup) (struct tcpcb *tp); 89 90 /* initialize cwnd at the start of a connection */ 91 void (*cwnd_init) (struct tcpcb *tp); 92 93 /* called on the receipt of in-sequence ack during congestion avoidance phase */ 94 void (*inseq_ack_rcvd) (struct tcpcb *tp, struct tcphdr *th); 95 96 /* called on the receipt of a valid ack */ 97 void (*ack_rcvd) (struct tcpcb *tp, struct tcphdr *th); 98 99 /* called before entering FR */ 100 void (*pre_fr) (struct tcpcb *tp); 101 102 /* after exiting FR */ 103 void (*post_fr) (struct tcpcb *tp, struct tcphdr *th); 104 105 /* perform tasks when data transfer resumes after an idle period */ 106 void (*after_idle) (struct tcpcb *tp); 107 108 /* perform tasks when the connection's retransmit timer expires */ 109 void (*after_timeout) (struct tcpcb *tp); 110 111 /* Whether or not to delay the ack */ 112 int (*delay_ack)(struct tcpcb *tp, struct tcphdr *th); 113 114 /* Switch a connection to this CC algorithm after sending some packets */ 115 void (*switch_to)(struct tcpcb *tp, uint16_t old_cc_index); 116 117} __attribute__((aligned(4))); 118 119extern struct tcp_cc_algo* tcp_cc_algo_list[TCP_CC_ALGO_COUNT]; 120 121#define CC_ALGO(tp) (tcp_cc_algo_list[tp->tcp_cc_index]) 122 123extern void tcp_cc_resize_sndbuf(struct tcpcb *tp); 124extern void tcp_bad_rexmt_fix_sndbuf(struct tcpcb *tp); 125 126#endif /* KERNEL */ 127#endif /* _NETINET_CC_H_ */ 128