mirror of
https://git.FreeBSD.org/src.git
synced 2024-12-22 11:17:19 +00:00
159 lines
4.9 KiB
Groff
159 lines
4.9 KiB
Groff
.\"
|
|
.\" Author: Alexander Motin <mav@alkar.net>
|
|
.\"
|
|
.\" Copyright (c) 2006, Alexander Motin <mav@alkar.net>
|
|
.\" All rights reserved.
|
|
.\"
|
|
.\" 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 unmodified, 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.
|
|
.\"
|
|
.\" $FreeBSD$
|
|
.\"
|
|
.Dd December 23, 2006
|
|
.Dt NG_DEFLATE 4
|
|
.Os
|
|
.Sh NAME
|
|
.Nm ng_deflate
|
|
.Nd Deflate PPP compression (RFC 1979) netgraph node type
|
|
.Sh SYNOPSIS
|
|
.In sys/types.h
|
|
.In netgraph/ng_deflate.h
|
|
.Sh DESCRIPTION
|
|
The
|
|
.Nm deflate
|
|
node type implements the Deflate sub-protocols of the Compression Control
|
|
Protocol (CCP).
|
|
.Pp
|
|
The node has two hooks,
|
|
.Va comp
|
|
for compression and
|
|
.Va decomp
|
|
for decompression.
|
|
Only one of them can be connected at the same time, specifying node's
|
|
operation mode.
|
|
Typically that hooks would be connected to the
|
|
.Xr ng_ppp 4
|
|
node type hook of the same name.
|
|
Corresponding
|
|
.Xr ng_ppp 4
|
|
node hook must be switched to
|
|
.Dv NG_PPP_DECOMPRESS_FULL
|
|
mode to permit sending uncompressed frames.
|
|
.Sh HOOKS
|
|
This node type supports the following hooks:
|
|
.Pp
|
|
.Bl -tag -compact -width ".Va decomp"
|
|
.It Va comp
|
|
Connection to
|
|
.Xr ng_ppp 4
|
|
.Va comp
|
|
hook.
|
|
Incoming frames are compressed (if possible) and sent back out the same hook.
|
|
.It Va decomp
|
|
Connection to
|
|
.Xr ng_ppp 4
|
|
.Va decomp
|
|
hook.
|
|
Incoming frames are decompressed (if they are compressed), and sent
|
|
back out the same hook.
|
|
.El
|
|
.Pp
|
|
Only one hook can be connected at the same time, specifying node's
|
|
operation mode.
|
|
.Sh CONTROL MESSAGES
|
|
This node type supports the generic control messages, plus the following:
|
|
.Bl -tag -width foo
|
|
.It Dv NGM_DEFLATE_CONFIG Pq Ic config
|
|
This command resets and configures the node for a session
|
|
(i.e., for compression or decompression).
|
|
This command takes a
|
|
.Vt "struct ng_deflate_config"
|
|
as an argument:
|
|
.Bd -literal -offset 0n
|
|
struct ng_deflate_config {
|
|
u_char enable; /* node enabled */
|
|
u_char windowBits; /* log2(Window size) */
|
|
};
|
|
.Ed
|
|
The
|
|
.Fa enabled
|
|
field enables traffic flow through the node.
|
|
The
|
|
.Fa windowBits
|
|
specify compression windows size as negotiated by the
|
|
Compression Control Protocol (CCP) in PPP.
|
|
.It Dv NGM_DEFLATE_RESETREQ Pq Ic resetreq
|
|
This message contains no arguments, and is bi-directional.
|
|
If an error is detected during decompression, this message is sent by the
|
|
node to the originator of the
|
|
.Dv NGM_DEFLATE_CONFIG
|
|
message that initiated the session.
|
|
The receiver should respond by sending a PPP CCP Reset-Request to the peer.
|
|
.Pp
|
|
This message may also be received by this node type when a CCP Reset-Request
|
|
or Reset-Ack is received by the local PPP entity.
|
|
The node will respond by flushing its compression state so the sides
|
|
can resynchronize.
|
|
.It Dv NGM_DEFLATE_GET_STATS Pq Ic getstats
|
|
This control message obtains statistics for a given hook.
|
|
The statistics are returned in
|
|
.Vt "struct ng_deflate_stats" :
|
|
.Bd -literal
|
|
struct ng_deflate_stats {
|
|
uint64_t FramesPlain;
|
|
uint64_t FramesComp;
|
|
uint64_t FramesUncomp;
|
|
uint64_t InOctets;
|
|
uint64_t OutOctets;
|
|
uint64_t Errors;
|
|
};
|
|
.Ed
|
|
.It Dv NGM_DEFLATE_CLR_STATS Pq Ic clrstats
|
|
This control message clears statistics for a given hook.
|
|
.It Dv NGM_DEFLATE_GETCLR_STATS Pq Ic getclrstats
|
|
This control message obtains and clears statistics for a given hook.
|
|
.El
|
|
.Sh SHUTDOWN
|
|
This node shuts down upon receipt of a
|
|
.Dv NGM_SHUTDOWN
|
|
control message, or when hook have been disconnected.
|
|
.Sh SEE ALSO
|
|
.Xr netgraph 4 ,
|
|
.Xr ng_ppp 4 ,
|
|
.Xr ngctl 8
|
|
.Rs
|
|
.%A J. Woods
|
|
.%T "PPP Deflate Protocol"
|
|
.%O RFC 1979
|
|
.Re
|
|
.Rs
|
|
.%A W. Simpson
|
|
.%T "The Point-to-Point Protocol (PPP)"
|
|
.%O RFC 1661
|
|
.Re
|
|
.Sh AUTHORS
|
|
.An Alexander Motin Aq mav@alkar.net
|
|
.Sh BUGS
|
|
Due to nature of netgraph PPP implementation there are possible race conditions
|
|
between data packet and ResetAck CCP packet in case of packet loss. As result,
|
|
packet loss can produce bigger performance degradation than supposed by protocol.
|