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tcp_congctl.h revision 1.4 
      1 /*	$NetBSD: tcp_congctl.h,v 1.4 2008/02/29 07:39:17 matt 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 #define TCPCC_MAXLEN 12
     43 
     44 struct tcp_congctlent {
     45 	TAILQ_ENTRY(tcp_congctlent) congctl_ent;
     46 	const struct tcp_congctl *congctl_ctl;
     47 	unsigned int congctl_refcnt;
     48 	char congctl_name[TCPCC_MAXLEN];
     49 };
     50 /*
     51  * Congestion control function table.
     52  */
     53 struct tcp_congctl {
     54 	int  (*fast_retransmit)(struct tcpcb *, const struct tcphdr *);
     55 	void (*slow_retransmit)(struct tcpcb *);
     56 	void (*fast_retransmit_newack)(struct tcpcb *, const struct tcphdr *);
     57 	void (*newack)(struct tcpcb *, const struct tcphdr *);
     58 	void (*cong_exp)(struct tcpcb *);
     59 };
     60 
     61 extern const struct tcp_congctl tcp_reno_ctl;
     62 extern const struct tcp_congctl tcp_newreno_ctl;
     63 
     64 extern struct simplelock tcp_congctl_slock;
     65 
     66 /* currently selected global congestion control */
     67 extern char tcp_congctl_global_name[TCPCC_MAXLEN];
     68 
     69 /* available global congestion control algorithms */
     70 extern char tcp_congctl_avail[10 * TCPCC_MAXLEN];
     71 
     72 void   tcp_congctl_init(void);
     73 int    tcp_congctl_register(const char *, const struct tcp_congctl *);
     74 int    tcp_congctl_unregister(const char *);
     75 int    tcp_congctl_select(struct tcpcb *, const char *);
     76 void   tcp_congctl_release(struct tcpcb *);
     77 const char *
     78        tcp_congctl_bystruct(const struct tcp_congctl *);
     79 
     80 #endif /* _NETINET_TCP_CONGCTL_H */
     81