179 lines
6.6 KiB
C
179 lines
6.6 KiB
C
/*-
|
|
* Copyright (c) 2007-2008
|
|
* Swinburne University of Technology, Melbourne, Australia.
|
|
* Copyright (c) 2009-2010 Lawrence Stewart <lstewart@freebsd.org>
|
|
* Copyright (c) 2010 The FreeBSD Foundation
|
|
* All rights reserved.
|
|
*
|
|
* This software was developed at the Centre for Advanced Internet
|
|
* Architectures, Swinburne University of Technology, by Lawrence Stewart and
|
|
* James Healy, made possible in part by a grant from the Cisco University
|
|
* Research Program Fund at Community Foundation Silicon Valley.
|
|
*
|
|
* Portions of this software were developed at the Centre for Advanced
|
|
* Internet Architectures, Swinburne University of Technology, Melbourne,
|
|
* Australia by David Hayes under sponsorship from the FreeBSD Foundation.
|
|
*
|
|
* 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 AUTHOR 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 AUTHOR 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.
|
|
*
|
|
* $FreeBSD$
|
|
*/
|
|
|
|
/*
|
|
* This software was first released in 2007 by James Healy and Lawrence Stewart
|
|
* whilst working on the NewTCP research project at Swinburne University of
|
|
* Technology's Centre for Advanced Internet Architectures, Melbourne,
|
|
* Australia, which was made possible in part by a grant from the Cisco
|
|
* University Research Program Fund at Community Foundation Silicon Valley.
|
|
* More details are available at:
|
|
* http://caia.swin.edu.au/urp/newtcp/
|
|
*/
|
|
|
|
#ifndef _NETINET_CC_CC_H_
|
|
#define _NETINET_CC_CC_H_
|
|
|
|
#if !defined(_KERNEL)
|
|
#error "no user-servicable parts inside"
|
|
#endif
|
|
|
|
/* Global CC vars. */
|
|
extern STAILQ_HEAD(cc_head, cc_algo) cc_list;
|
|
extern const int tcprexmtthresh;
|
|
extern struct cc_algo newreno_cc_algo;
|
|
|
|
/* Per-netstack bits. */
|
|
VNET_DECLARE(struct cc_algo *, default_cc_ptr);
|
|
#define V_default_cc_ptr VNET(default_cc_ptr)
|
|
|
|
/* Define the new net.inet.tcp.cc sysctl tree. */
|
|
SYSCTL_DECL(_net_inet_tcp_cc);
|
|
|
|
/* CC housekeeping functions. */
|
|
int cc_register_algo(struct cc_algo *add_cc);
|
|
int cc_deregister_algo(struct cc_algo *remove_cc);
|
|
|
|
/*
|
|
* Wrapper around transport structs that contain same-named congestion
|
|
* control variables. Allows algos to be shared amongst multiple CC aware
|
|
* transprots.
|
|
*/
|
|
struct cc_var {
|
|
void *cc_data; /* Per-connection private CC algorithm data. */
|
|
int bytes_this_ack; /* # bytes acked by the current ACK. */
|
|
tcp_seq curack; /* Most recent ACK. */
|
|
uint32_t flags; /* Flags for cc_var (see below) */
|
|
int type; /* Indicates which ptr is valid in ccvc. */
|
|
union ccv_container {
|
|
struct tcpcb *tcp;
|
|
struct sctp_nets *sctp;
|
|
} ccvc;
|
|
};
|
|
|
|
/* cc_var flags. */
|
|
#define CCF_ABC_SENTAWND 0x0001 /* ABC counted cwnd worth of bytes? */
|
|
#define CCF_CWND_LIMITED 0x0002 /* Are we currently cwnd limited? */
|
|
#define CCF_DELACK 0x0004 /* Is this ack delayed? */
|
|
#define CCF_ACKNOW 0x0008 /* Will this ack be sent now? */
|
|
#define CCF_IPHDR_CE 0x0010 /* Does this packet set CE bit? */
|
|
#define CCF_TCPHDR_CWR 0x0020 /* Does this packet set CWR bit? */
|
|
|
|
/* ACK types passed to the ack_received() hook. */
|
|
#define CC_ACK 0x0001 /* Regular in sequence ACK. */
|
|
#define CC_DUPACK 0x0002 /* Duplicate ACK. */
|
|
#define CC_PARTIALACK 0x0004 /* Not yet. */
|
|
#define CC_SACK 0x0008 /* Not yet. */
|
|
|
|
/*
|
|
* Congestion signal types passed to the cong_signal() hook. The highest order 8
|
|
* bits (0x01000000 - 0x80000000) are reserved for CC algos to declare their own
|
|
* congestion signal types.
|
|
*/
|
|
#define CC_ECN 0x00000001 /* ECN marked packet received. */
|
|
#define CC_RTO 0x00000002 /* RTO fired. */
|
|
#define CC_RTO_ERR 0x00000004 /* RTO fired in error. */
|
|
#define CC_NDUPACK 0x00000008 /* Threshold of dupack's reached. */
|
|
|
|
#define CC_SIGPRIVMASK 0xFF000000 /* Mask to check if sig is private. */
|
|
|
|
/*
|
|
* Structure to hold data and function pointers that together represent a
|
|
* congestion control algorithm.
|
|
*/
|
|
struct cc_algo {
|
|
char name[TCP_CA_NAME_MAX];
|
|
|
|
/* Init global module state on kldload. */
|
|
int (*mod_init)(void);
|
|
|
|
/* Cleanup global module state on kldunload. */
|
|
int (*mod_destroy)(void);
|
|
|
|
/* Init CC state for a new control block. */
|
|
int (*cb_init)(struct cc_var *ccv);
|
|
|
|
/* Cleanup CC state for a terminating control block. */
|
|
void (*cb_destroy)(struct cc_var *ccv);
|
|
|
|
/* Init variables for a newly established connection. */
|
|
void (*conn_init)(struct cc_var *ccv);
|
|
|
|
/* Called on receipt of an ack. */
|
|
void (*ack_received)(struct cc_var *ccv, uint16_t type);
|
|
|
|
/* Called on detection of a congestion signal. */
|
|
void (*cong_signal)(struct cc_var *ccv, uint32_t type);
|
|
|
|
/* Called after exiting congestion recovery. */
|
|
void (*post_recovery)(struct cc_var *ccv);
|
|
|
|
/* Called when data transfer resumes after an idle period. */
|
|
void (*after_idle)(struct cc_var *ccv);
|
|
|
|
/* Called for an additional ECN processing apart from RFC3168. */
|
|
void (*ecnpkt_handler)(struct cc_var *ccv);
|
|
|
|
/* Called for {get|set}sockopt() on a TCP socket with TCP_CCALGOOPT. */
|
|
int (*ctl_output)(struct cc_var *, struct sockopt *, void *);
|
|
|
|
STAILQ_ENTRY (cc_algo) entries;
|
|
};
|
|
|
|
/* Macro to obtain the CC algo's struct ptr. */
|
|
#define CC_ALGO(tp) ((tp)->cc_algo)
|
|
|
|
/* Macro to obtain the CC algo's data ptr. */
|
|
#define CC_DATA(tp) ((tp)->ccv->cc_data)
|
|
|
|
/* Macro to obtain the system default CC algo's struct ptr. */
|
|
#define CC_DEFAULT() V_default_cc_ptr
|
|
|
|
extern struct rwlock cc_list_lock;
|
|
#define CC_LIST_LOCK_INIT() rw_init(&cc_list_lock, "cc_list")
|
|
#define CC_LIST_LOCK_DESTROY() rw_destroy(&cc_list_lock)
|
|
#define CC_LIST_RLOCK() rw_rlock(&cc_list_lock)
|
|
#define CC_LIST_RUNLOCK() rw_runlock(&cc_list_lock)
|
|
#define CC_LIST_WLOCK() rw_wlock(&cc_list_lock)
|
|
#define CC_LIST_WUNLOCK() rw_wunlock(&cc_list_lock)
|
|
#define CC_LIST_LOCK_ASSERT() rw_assert(&cc_list_lock, RA_LOCKED)
|
|
|
|
#endif /* _NETINET_CC_CC_H_ */
|