FreeBSD/Linux Kernel Cross Reference
sys/netinet/tcp_congctl.h

     /*      $NetBSD: tcp_congctl.h,v 1.7 2013/11/12 09:02:05 kefren Exp $   */
     
     /*
      * Copyright (c) 2006 The NetBSD Foundation, Inc.
      * All rights reserved.
      *
      * This code is derived from software contributed to The NetBSD Foundation
      * by Rui Paulo.
      *
     * Redistribution and use in source and binary forms, with or without
     * modification, are permitted provided that the following conditions
     * are met:
     * 1. Redistributions of source code must retain the above copyright
     *    notice, this list of conditions and the following disclaimer.
     * 2. Redistributions in binary form must reproduce the above copyright
     *    notice, this list of conditions and the following disclaimer in the
     *    documentation and/or other materials provided with the distribution.
     *
     * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
     * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
     * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
     * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
     * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
     * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
     * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
     * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
     * POSSIBILITY OF SUCH DAMAGE.
     */
    
    #ifndef _NETINET_TCP_CONGCTL_H
    #define _NETINET_TCP_CONGCTL_H
    
    #define TCPCC_MAXLEN 12
    
    struct tcp_congctlent {
            TAILQ_ENTRY(tcp_congctlent) congctl_ent;
            const struct tcp_congctl *congctl_ctl;
            unsigned int congctl_refcnt;
            char congctl_name[TCPCC_MAXLEN];
    };
    /*
     * Congestion control function table.
     */
    struct tcp_congctl {
            /*
             * fast_retransmit: called on tcprexmtthresh'th dup ACKs.
             * this actually retransmits packets by calling tcp_output()
             * if appropriate.
             * returns 0 if entering fast recovery.  otherwise returns non-0.
             */
            int  (*fast_retransmit)(struct tcpcb *, const struct tcphdr *);
    
            /*
             * slow_retransmit: called on RTO to adjust parameters like cwnd.
             */
            void (*slow_retransmit)(struct tcpcb *);
    
            /*
             * fast_retransmit_newack: called when new data is acked.
             * ie. when advancing SND.UNA
             * not called if TCP_SACK_ENABLED.
             */
            void (*fast_retransmit_newack)(struct tcpcb *, const struct tcphdr *);
    
            /*
             * newack: called when new data is acked.  ie. when advancing SND.UNA
             * it's called before updating tp->snd_una.
             */
            void (*newack)(struct tcpcb *, const struct tcphdr *);
    
            /*
             * cong_exp: called when congestion is detected.  eg. by ECN
             */
            void (*cong_exp)(struct tcpcb *);
    };
    
    extern const struct tcp_congctl tcp_reno_ctl;
    extern const struct tcp_congctl tcp_newreno_ctl;
    extern const struct tcp_congctl tcp_cubic_ctl;
    
    /* currently selected global congestion control */
    extern char tcp_congctl_global_name[TCPCC_MAXLEN];
    
    /* available global congestion control algorithms */
    extern char tcp_congctl_avail[10 * TCPCC_MAXLEN];
    
    void   tcp_congctl_init(void);
    int    tcp_congctl_register(const char *, const struct tcp_congctl *);
    int    tcp_congctl_unregister(const char *);
    int    tcp_congctl_select(struct tcpcb *, const char *);
    void   tcp_congctl_release(struct tcpcb *);
    const char *
           tcp_congctl_bystruct(const struct tcp_congctl *);
    
    #endif /* _NETINET_TCP_CONGCTL_H */

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