131 lines
4.1 KiB
Groff
131 lines
4.1 KiB
Groff
.\" Copyright (c) 2018 Devin Teske <dteske@FreeBSD.org>
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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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.Dd April 22, 2018
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.Dt DTRACE_SCTP 4
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.Os
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.Sh NAME
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.Nm dtrace_sctp
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.Nd a DTrace provider for tracing events related to the
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.Xr sctp 4
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protocol
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.Sh SYNOPSIS
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.Fn sctp:cwnd::init uint32_t uint32_t uintptr_t int int
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.Fn sctp:cwnd::ack uint32_t uint32_t uintptr_t int int
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.Fn sctp:cwnd::rttvar uint64_t uint64_t uint64_t uint64_t uint64_t
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.Fn sctp:cwnd::rttstep uint64_t uint64_t uint64_t uint64_t uint64_t
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.Fn sctp:cwnd::fr uint32_t uint32_t uintptr_t int int
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.Fn sctp:cwnd::to uint32_t uint32_t uintptr_t int int
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.Fn sctp:cwnd::bl uint32_t uint32_t uintptr_t int int
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.Fn sctp:cwnd::ecn uint32_t uint32_t uintptr_t int int
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.Fn sctp:cwnd::pd uint32_t uint32_t uintptr_t int int
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.Fn sctp:rwnd:assoc:val uint32_t uint32_t int int
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.Fn sctp:flightsize:net:val uint32_t uint32_t uintptr_t int int
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.Fn sctp:flightsize:assoc:val uint32_t uint32_t int int
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.Sh DESCRIPTION
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The DTrace
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.Nm sctp
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provider allows users to trace events in the
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.Xr sctp 4
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protocol implementation.
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This provider is similar to the
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.Xr dtrace_ip 4
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and
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.Xr dtrace_udp 4
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providers,
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but additionally contains probes corresponding to protocol events at a level
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higher than packet reception and transmission.
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.Pp
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The
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.Fn sctp:cwnd::
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probes track changes in the congestion window on a netp.
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The
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.Fn sctp:rwnd::
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probes track changes in the receiver window for an assoc.
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The
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.Fn sctp:flightsize:net:val
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probe tracks changes in the flight size on a net or assoc and the
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.Fn sctp:flightsize:assoc:val
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probe provides the total flight version.
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.Pp
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The arguments of all
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.Nm sctp
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probes except for
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.Fn sctp:cwnd::rtt*
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and
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.Fn sctp::assoc:val
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are the Vtag for this end,
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the port number of the local side,
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the pointer to
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.Dv struct sctp_nets *changing ,
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the old value of the cwnd,
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and the new value of the cwnd.
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.Pp
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The arguments of
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.Fn sctp:::val
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are similar to the above except the fourth argument is the up/down amount.
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.Pp
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The
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.Fn sctp:cwnd::rtt*
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probe arguments are a bitmap of
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.Dv Vtag << 32 | localport << 16 | remoteport ,
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a bitmap of
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.Dv obw | nbw ,
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a bitmap of
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.Dv bwrtt | newrtt ,
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.Dv flight ,
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and a bitmap of
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.Dv (cwnd << 32) | point << 16 | retval(0/1) .
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.Pp
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The
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.Fn sctp:cwnd::init
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probe fires when a remotely-initiated active SCTP open succeeds.
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At this point the new connection is in the ESTABLISHED state, and the probe
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arguments expose the headers associated with the final ACK of the four-way
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handshake.
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.\" .Sh ARGUMENTS
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.\" .Sh FILES
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.\" .Sh EXAMPLES
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.\" .Sh COMPATIBILITY
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.\" This provider has not been tested for compatiblity with the
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.\" .Nm sctp
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.\" provider in Solaris
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.\" .Pq if one exists .
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.Sh SEE ALSO
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.Xr dtrace 1 ,
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.Xr dtrace_ip 4 ,
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.Xr dtrace_udp 4 ,
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.Xr sctp 4 ,
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.Xr SDT 9
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.\" .Sh HISTORY
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.\" The
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.\" .Nm sctp
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.\" provider first appeared in
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.\" .Fx
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.\" UNKNOWN.
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.Sh AUTHORS
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This manual page was written by
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.An Devin Teske Aq Mt dteske@FreeBSD.org .
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