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03f0843bdb
top 8 bits of the 32 bit signal bit field space for internal use. These private signals should not be leaked outside of a module. Given that many algorithm modules use the NewReno hook functions to simplify their implementation, the obvious place such a leak would show up is in the NewReno cong_signal hook function. - Show the full number of significant bits in the signal type definitions in <netinet/cc.h>. - Add a bitmask to simplify figuring out if a given signal is in the private or public bit range. - Add a sanity check in newreno_cong_signal() to ensure private signals are not being leaked into the hook function. Sponsored by: FreeBSD Foundation Discussed with: David Hayes <dahayes at swin edu au> MFC after: 1 week X-MFC with: r215166
167 lines
6.1 KiB
C
167 lines
6.1 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, by Lawrence Stewart and James Healy,
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* made possible in part by a grant from the Cisco University Research Program
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* 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's
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* Centre for Advanced Internet Architectures, Melbourne, Australia, which was
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* made possible in part by a grant from the Cisco University Research Program
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* Fund at Community Foundation Silicon Valley. More details are available at:
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* http://caia.swin.edu.au/urp/newtcp/
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*/
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#ifndef _NETINET_CC_H_
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#define _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 <netinet/tcp.h>
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/* Global CC vars. */
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extern STAILQ_HEAD(cc_head, cc_algo) cc_list;
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extern const int tcprexmtthresh;
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extern struct cc_algo newreno_cc_algo;
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/* Per-netstack bits. */
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VNET_DECLARE(struct cc_algo *, default_cc_ptr);
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#define V_default_cc_ptr VNET(default_cc_ptr)
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/* Define the new net.inet.tcp.cc sysctl tree. */
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SYSCTL_DECL(_net_inet_tcp_cc);
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/* CC housekeeping functions. */
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int cc_register_algo(struct cc_algo *add_cc);
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int cc_deregister_algo(struct cc_algo *remove_cc);
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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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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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/* 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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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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/* 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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/* Macro to obtain the system default CC algo's struct ptr. */
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#define CC_DEFAULT() V_default_cc_ptr
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extern struct rwlock cc_list_lock;
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#define CC_LIST_LOCK_INIT() rw_init(&cc_list_lock, "cc_list")
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#define CC_LIST_LOCK_DESTROY() rw_destroy(&cc_list_lock)
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#define CC_LIST_RLOCK() rw_rlock(&cc_list_lock)
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#define CC_LIST_RUNLOCK() rw_runlock(&cc_list_lock)
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#define CC_LIST_WLOCK() rw_wlock(&cc_list_lock)
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#define CC_LIST_WUNLOCK() rw_wunlock(&cc_list_lock)
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#define CC_LIST_LOCK_ASSERT() rw_assert(&cc_list_lock, RA_LOCKED)
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#endif /* _NETINET_CC_H_ */
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