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-.\" Copyright (c) 1996-1999 Whistle Communications, Inc.
-.\" All rights reserved.
-.\" 
-.\" Subject to the following obligations and disclaimer of warranty, use and
-.\" redistribution of this software, in source or object code forms, with or
-.\" without modifications are expressly permitted by Whistle Communications;
-.\" provided, however, that:
-.\" 1. Any and all reproductions of the source or object code must include the
-.\"    copyright notice above and the following disclaimer of warranties; and
-.\" 2. No rights are granted, in any manner or form, to use Whistle
-.\"    Communications, Inc. trademarks, including the mark "WHISTLE
-.\"    COMMUNICATIONS" on advertising, endorsements, or otherwise except as
-.\"    such appears in the above copyright notice or in the software.
-.\" 
-.\" THIS SOFTWARE IS BEING PROVIDED BY WHISTLE COMMUNICATIONS "AS IS", AND
-.\" TO THE MAXIMUM EXTENT PERMITTED BY LAW, WHISTLE COMMUNICATIONS MAKES NO
-.\" REPRESENTATIONS OR WARRANTIES, EXPRESS OR IMPLIED, REGARDING THIS SOFTWARE,
-.\" INCLUDING WITHOUT LIMITATION, ANY AND ALL IMPLIED WARRANTIES OF
-.\" MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, OR NON-INFRINGEMENT.
-.\" WHISTLE COMMUNICATIONS DOES NOT WARRANT, GUARANTEE, OR MAKE ANY
-.\" REPRESENTATIONS REGARDING THE USE OF, OR THE RESULTS OF THE USE OF THIS
-.\" SOFTWARE IN TERMS OF ITS CORRECTNESS, ACCURACY, RELIABILITY OR OTHERWISE.
-.\" IN NO EVENT SHALL WHISTLE COMMUNICATIONS BE LIABLE FOR ANY DAMAGES
-.\" RESULTING FROM OR ARISING OUT OF ANY USE OF THIS SOFTWARE, INCLUDING
-.\" WITHOUT LIMITATION, ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY,
-.\" PUNITIVE, OR CONSEQUENTIAL DAMAGES, PROCUREMENT OF SUBSTITUTE GOODS OR
-.\" SERVICES, LOSS OF USE, DATA OR PROFITS, HOWEVER CAUSED AND UNDER ANY
-.\" THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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-.\" OF SUCH DAMAGE.
-.\" 
-.\" Author: Archie Cobbs <archie@whistle.com>
-.\"
-.\" $FreeBSD$
-.\" $Whistle: ng_async.8,v 1.6 1999/01/25 23:46:25 archie Exp $
-.\"
-.Dd January 19, 1999
-.Dt NG_ASYNC 4
-.Os FreeBSD
-.Sh NAME
-.Nm ng_async
-.Nd asynchronous framing netgraph node type
-.Sh SYNOPSIS
-.Fd #include <netgraph/ng_async.h>
-.Sh DESCRIPTION
-The
-.Nm async
-node type performs conversion between synchronous frames and
-asynchronous frames, as defined for the PPP protocol in RFC 1662.
-Asynchronous framing uses flag bytes and octet-stuffing
-to simulate a frame oriented connection over an octet-oriented
-asynchronous serial line.
-.Pp
-The node transmits and receives asynchronous data on the
-.Dv async
-hook.  Mbuf boundaries of incoming data are ignored.
-Once a complete packet has been received, it is decoded and
-stripped of all framing bytes, and transmitted out the
-.Dv sync
-hook as a single frame.
-.Pp
-Synchronous frames are transmitted and received on the
-.Dv sync
-hook.
-Packets received on this hook are encoded as asynchronous frames
-and sent out on
-.Dv async .
-Received packets should start with the address and control fields,
-or the PPP protocol field if address and control field compression
-is employed, and contain no checksum field.  If the first four bytes are
-.Dv "0xff 0x03 0xc0 0x21"
-(an LCP protocol frame) then complete control character escaping
-is enabled for that frame (in PPP, LCP packets are always sent with
-no address and control field compression and all control characters
-escaped).
-.Pp
-This node supports
-.Dq flag sharing
-for packets transmitted on
-.Dv async .
-This is an optimization where the trailing flag byte
-of one frame is shared with the opening flag byte of the next.
-Flag sharing between frames is disabled after one second of transmit
-idle time.
-.Sh HOOKS
-This node type supports the following hooks:
-.Pp
-.Bl -tag -width foobar
-.It Dv async
-Asynchronous connection.
-Typically this hook would be connected to a
-.Xr ng_tty 4
-node, which handles transmission of serial data over a tty device.
-.It Dv sync
-Synchronous connection.  This hook sends and receives synchronous frames.
-For PPP, these frames should contain address, control, and protocol fields,
-but no checksum field.
-Typically this hook would be connected to an individual link hook of a
-.Xr ng_ppp 4
-type node.
-.El
-.Sh CONTROL MESSAGES
-This node type supports the generic control messages, plus the following:
-.Bl -tag -width foo
-.It Dv NGM_ASYNC_CMD_GET_STATS
-This command returns a
-.Dv "struct ng_async_stat"
-containing node statistics for packet, octet, and error counts.
-.It Dv NGM_ASYNC_CMD_CLR_STATS
-Clears the node statistics.
-.It Dv NGM_ASYNC_CMD_SET_CONFIG
-Sets the node configuration, which is described by a
-.Dv "struct ng_async_cfg" :
-.Bd -literal -offset 4n
-struct ng_async_cfg {
-  u_char    enabled;  /* Turn encoding on/off */
-  u_int16_t amru;     /* Max receive async frame len */
-  u_int16_t smru;     /* Max receive sync frame len */
-  u_int32_t accm;     /* ACCM encoding */
-};
-.Ed
-.Pp
-The
-.Dv enabled
-field enables or disables all encoding/decoding functions (default disabled).
-When disabled, the node operates in simple
-.Dq pass through
-mode.
-The
-.Dv amru
-and
-.Dv smru
-fields are the asynchronous and synchronous MRU (maximum receive unit) values,
-respectively.  These both default to 1600; note that the async MRU
-applies to the incoming frame length after asynchronous decoding.
-The
-.Dv accm
-field is the asynchronous character control map, which controls the escaping
-of characters 0x00 thorough 0x1f (default 0xffffffff).
-.It Dv NGM_ASYNC_CMD_GET_CONFIG
-This command returns the current configuration structure.
-.El
-.Sh SHUTDOWN
-This node shuts down upon receipt of a
-.Dv NGM_SHUTDOWN
-control message, or when all hooks have been disconnected.
-.Sh SEE ALSO
-.Xr netgraph 4 ,
-.Xr ng_ppp 4 ,
-.Xr ng_tty 4 ,
-.Xr ngctl 8
-.Rs
-.%A W. Simpson
-.%T "PPP in HDLC-link Framing"
-.%O RFC 1662
-.Re
-.Rs
-.%A W. Simpson
-.%T "The Point-to-Point Protocol (PPP)"
-.%O RFC 1661
-.Re
-.Sh HISTORY
-The
-.Nm
-node type was implemented in
-.Fx 4.0 .
-.Sh AUTHORS
-.An Archie Cobbs Aq archie@whistle.com