164 lines
6.3 KiB
C
164 lines
6.3 KiB
C
/*-
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* Copyright (c) 2007-2008
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* Swinburne University of Technology, Melbourne, Australia.
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* Copyright (c) 2009-2010 Lawrence Stewart <lstewart@freebsd.org>
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* Copyright (c) 2010 The FreeBSD Foundation
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* All rights reserved.
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*
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* This software was developed at the Centre for Advanced Internet
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* Architectures, Swinburne University of Technology, by Lawrence Stewart and
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* James Healy, made possible in part by a grant from the Cisco University
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* Research Program Fund at Community Foundation Silicon Valley.
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*
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* Portions of this software were developed at the Centre for Advanced
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* Internet Architectures, Swinburne University of Technology, Melbourne,
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* Australia by David Hayes under sponsorship from the FreeBSD Foundation.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* $FreeBSD$
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*/
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/*
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* This software was first released in 2007 by James Healy and Lawrence Stewart
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* whilst working on the NewTCP research project at Swinburne University of
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* Technology's Centre for Advanced Internet Architectures, Melbourne,
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* Australia, which was made possible in part by a grant from the Cisco
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* University Research Program Fund at Community Foundation Silicon Valley.
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* More details are available at:
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* http://caia.swin.edu.au/urp/newtcp/
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*/
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/*
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* samkumar: The FreeBSD implementation supports many congestion control
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* algorithms, each represented by a struct. Each tcpcb has a pointer to the
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* relevant congestion control struct, and the congestion control structs are
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* themselves part of an intrusive linked list. TCPlp hardcodes the congestion
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* control algorithm to New Reno, so the fields corresponding to maintaining
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* the global linked list are removed.
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*/
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#ifndef TCPLP_NETINET_CC_H_
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#define TCPLP_NETINET_CC_H_
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/* XXX: TCP_CA_NAME_MAX define lives in tcp.h for compat reasons. */
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#include "tcp.h"
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extern const struct cc_algo newreno_cc_algo;
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/*
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* Wrapper around transport structs that contain same-named congestion
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* control variables. Allows algos to be shared amongst multiple CC aware
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* transprots.
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*/
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struct cc_var {
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void *cc_data; /* Per-connection private CC algorithm data. */
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int bytes_this_ack; /* # bytes acked by the current ACK. */
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tcp_seq curack; /* Most recent ACK. */
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uint32_t flags; /* Flags for cc_var (see below) */
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/* samkumar: removing type, since TCPlp uses TCP congestion control. */
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//int type; /* Indicates which ptr is valid in ccvc. */
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union ccv_container {
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struct tcpcb *tcp;
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struct sctp_nets *sctp;
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} ccvc;
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};
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/* cc_var flags. */
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#define CCF_ABC_SENTAWND 0x0001 /* ABC counted cwnd worth of bytes? */
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#define CCF_CWND_LIMITED 0x0002 /* Are we currently cwnd limited? */
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#define CCF_DELACK 0x0004 /* Is this ack delayed? */
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#define CCF_ACKNOW 0x0008 /* Will this ack be sent now? */
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#define CCF_IPHDR_CE 0x0010 /* Does this packet set CE bit? */
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#define CCF_TCPHDR_CWR 0x0020 /* Does this packet set CWR bit? */
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/* ACK types passed to the ack_received() hook. */
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#define CC_ACK 0x0001 /* Regular in sequence ACK. */
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#define CC_DUPACK 0x0002 /* Duplicate ACK. */
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#define CC_PARTIALACK 0x0004 /* Not yet. */
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#define CC_SACK 0x0008 /* Not yet. */
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/*
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* Congestion signal types passed to the cong_signal() hook. The highest order 8
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* bits (0x01000000 - 0x80000000) are reserved for CC algos to declare their own
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* congestion signal types.
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*/
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#define CC_ECN 0x00000001 /* ECN marked packet received. */
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#define CC_RTO 0x00000002 /* RTO fired. */
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#define CC_RTO_ERR 0x00000004 /* RTO fired in error. */
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#define CC_NDUPACK 0x00000008 /* Threshold of dupack's reached. */
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#define CC_SIGPRIVMASK 0xFF000000 /* Mask to check if sig is private. */
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/*
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* Structure to hold data and function pointers that together represent a
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* congestion control algorithm.
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*/
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struct cc_algo {
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char name[TCP_CA_NAME_MAX];
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/* Init global module state on kldload. */
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int (*mod_init)(void);
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/* Cleanup global module state on kldunload. */
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int (*mod_destroy)(void);
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/* Init CC state for a new control block. */
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int (*cb_init)(struct cc_var *ccv);
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/* Cleanup CC state for a terminating control block. */
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void (*cb_destroy)(struct cc_var *ccv);
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/* Init variables for a newly established connection. */
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void (*conn_init)(struct cc_var *ccv);
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/* Called on receipt of an ack. */
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void (*ack_received)(struct cc_var *ccv, uint16_t type);
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/* Called on detection of a congestion signal. */
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void (*cong_signal)(struct cc_var *ccv, uint32_t type);
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/* Called after exiting congestion recovery. */
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void (*post_recovery)(struct cc_var *ccv);
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/* Called when data transfer resumes after an idle period. */
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void (*after_idle)(struct cc_var *ccv);
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/* Called for an additional ECN processing apart from RFC3168. */
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void (*ecnpkt_handler)(struct cc_var *ccv);
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/*
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* samkumar: This field is removed since we no longer use the intrusive
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* linked list.
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*/
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//STAILQ_ENTRY (cc_algo) entries;
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};
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/* Macro to obtain the CC algo's struct ptr. */
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//#define CC_ALGO(tp) ((tp)->cc_algo)
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#define CC_ALGO(tp) (&newreno_cc_algo) // samkumar: This allows the #defines in cc_newreno.c to work as intended
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/* Macro to obtain the CC algo's data ptr. */
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#define CC_DATA(tp) ((tp)->ccv->cc_data)
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#endif /* _NETINET_CC_H_ */
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