sys/netinet/tcp_congctl.h

   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  *
  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         int  (*fast_retransmit)(struct tcpcb *, const struct tcphdr *);
  48         void (*slow_retransmit)(struct tcpcb *);
  49         void (*fast_retransmit_newack)(struct tcpcb *, const struct tcphdr *);
  50         void (*newack)(struct tcpcb *, const struct tcphdr *);
  51         void (*cong_exp)(struct tcpcb *);
  52 };
  53
  54 extern const struct tcp_congctl tcp_reno_ctl;
  55 extern const struct tcp_congctl tcp_newreno_ctl;
  56
  57 extern struct simplelock tcp_congctl_slock;
  58
  59 /* currently selected global congestion control */
  60 extern char tcp_congctl_global_name[TCPCC_MAXLEN];
  61
  62 /* available global congestion control algorithms */
  63 extern char tcp_congctl_avail[10 * TCPCC_MAXLEN];
  64
  65 void   tcp_congctl_init(void);
  66 int    tcp_congctl_register(const char *, const struct tcp_congctl *);
  67 int    tcp_congctl_unregister(const char *);
  68 int    tcp_congctl_select(struct tcpcb *, const char *);
  69 void   tcp_congctl_release(struct tcpcb *);
  70 const char *
  71        tcp_congctl_bystruct(const struct tcp_congctl *);
  72
  73 #endif /* _NETINET_TCP_CONGCTL_H */