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tcp_congctl.h revision 1.2 
      1 /*	$NetBSD: tcp_congctl.h,v 1.2 2006/10/15 17:45:06 rpaulo 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 *, struct tcphdr *);
     47 	void (*slow_retransmit)(struct tcpcb *);
     48 	void (*fast_retransmit_newack)(struct tcpcb *, struct tcphdr *);
     49 	void (*newack)(struct tcpcb *, 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 */
     77