172 lines
5.5 KiB
Groff
172 lines
5.5 KiB
Groff
.\" Copyright (c) 1996-1999 Whistle Communications, Inc.
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.\" All rights reserved.
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.\"
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.\" Subject to the following obligations and disclaimer of warranty, use and
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.\" redistribution of this software, in source or object code forms, with or
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.\" without modifications are expressly permitted by Whistle Communications;
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.\" provided, however, that:
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.\" 1. Any and all reproductions of the source or object code must include the
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.\" copyright notice above and the following disclaimer of warranties; and
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.\" 2. No rights are granted, in any manner or form, to use Whistle
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.\" Communications, Inc. trademarks, including the mark "WHISTLE
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.\" COMMUNICATIONS" on advertising, endorsements, or otherwise except as
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.\" such appears in the above copyright notice or in the software.
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.\"
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.\" THIS SOFTWARE IS BEING PROVIDED BY WHISTLE COMMUNICATIONS "AS IS", AND
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.\" TO THE MAXIMUM EXTENT PERMITTED BY LAW, WHISTLE COMMUNICATIONS MAKES NO
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.\" REPRESENTATIONS OR WARRANTIES, EXPRESS OR IMPLIED, REGARDING THIS SOFTWARE,
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.\" INCLUDING WITHOUT LIMITATION, ANY AND ALL IMPLIED WARRANTIES OF
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.\" MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, OR NON-INFRINGEMENT.
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.\" WHISTLE COMMUNICATIONS DOES NOT WARRANT, GUARANTEE, OR MAKE ANY
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.\" REPRESENTATIONS REGARDING THE USE OF, OR THE RESULTS OF THE USE OF THIS
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.\" SOFTWARE IN TERMS OF ITS CORRECTNESS, ACCURACY, RELIABILITY OR OTHERWISE.
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.\" IN NO EVENT SHALL WHISTLE COMMUNICATIONS BE LIABLE FOR ANY DAMAGES
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.\" RESULTING FROM OR ARISING OUT OF ANY USE OF THIS SOFTWARE, INCLUDING
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.\" WITHOUT LIMITATION, ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY,
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.\" PUNITIVE, OR CONSEQUENTIAL DAMAGES, PROCUREMENT OF SUBSTITUTE GOODS OR
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.\" SERVICES, LOSS OF USE, DATA OR PROFITS, HOWEVER CAUSED AND UNDER ANY
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.\" THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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.\" (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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.\" THIS SOFTWARE, EVEN IF WHISTLE COMMUNICATIONS IS ADVISED OF THE POSSIBILITY
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.\" OF SUCH DAMAGE.
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.\"
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.\" Author: Archie Cobbs <archie@whistle.com>
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.\"
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.\" $FreeBSD$
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.\" $Whistle: ng_cisco.8,v 1.5 1999/01/25 23:46:26 archie Exp $
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.\"
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.Dd January 19, 1999
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.Dt NG_CISCO 8
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.Os FreeBSD
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.Sh NAME
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.Nm ng_cisco
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.Nd Cisco HDLC protocol netgraph node type
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.Sh SYNOPSIS
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.Fd #include <netinet/in.h>
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.Fd #include <netgraph/ng_cisco.h>
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.Sh DESCRIPTION
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The
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.Nm cisco
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node type performs encapsulation and de-encapsulation of packets
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using the Cisco HDLC protocol. This is a fairly simple
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protocol for the transmission of packets across
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high speed synchronous lines. Each packet is prepended with
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an Ethertype, indicating the protocol. There is also a
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.Dq keep alive
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and an
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.Dq inquire
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capability.
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.Pp
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The
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.Dv downstream
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hook should connect to the synchronous line. On the other side
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of the node are the
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.Dv inet ,
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.Dv atalk ,
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and
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.Dv ipx
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hooks, which transmit and receive raw IP, AppleTalk, and IPX packets,
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respectively. Typically these hooks would connect to the corresponding
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hooks on an
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.Xr ng_iface 8
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type node.
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.Sh IP Configuration
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In order to function properly for IP traffic, the node must be informed
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of the local IP address and netmask setting. This is because the protocol
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includes an
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.Dq inquire
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packet which we must be prepared to answer.
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There are two ways to accomplish this, manually and automatically.
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.Pp
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Whenever such an inquire packet is received, the node sends a
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.Dv NGM_CISCO_GET_IPADDR
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control message to the peer node connected to the
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.Dv inet
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hook (if any).
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If the peer responds, then that response is used. This is the automatic method.
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.Pp
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If the peer does not respond, the node falls back on its cached value
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for the IP address and netmask. This cached value can be set at any time
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with a
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.Dv NGM_CISCO_SET_IPADDR
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message, and this is the manual method.
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.Pp
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If the
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.Dv inet
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hook is connected to the
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.Dv inet
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hook of an
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.Xr ng_iface 8
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node, as is usually the case, then configuration is automatic as the
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.Xr ng_iface 8
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understands the
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.Dv NGM_CISCO_GET_IPADDR
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message.
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.Sh HOOKS
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This node type supports the following hooks:
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.Pp
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.Bl -tag -width foobarbazio
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.It Dv downstream
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The connection to the synchronous line.
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.It Dv inet
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IP hook.
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.It Dv atalk
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AppleTalk hook.
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.It Dv ipx
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IPX hook
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.El
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.Sh CONTROL MESSAGES
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This node type supports the generic control messages, plus the following:
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.Bl -tag -width foo
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.It Dv NGM_CISCO_SET_IPADDR
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This command takes an array of two
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.Dv "struct in_addr"
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arguments. The first is the IP address of the corresponding interface
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and the second is the netmask.
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.It Dv NGM_CISCO_GET_IPADDR
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This command returns the IP configuration in the same format used by
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.Dv NGM_CISCO_SET_IPADDR .
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This command is also
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.Em sent
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by this node type to the
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.Dv inet
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peer whenever an IP address inquiry packet is received.
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.It Dv NGM_CISCO_GET_STATUS
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Returns a
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.Dv "struct ngciscostat" :
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.Bd -literal -offset 4n
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struct ngciscostat {
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u_int32_t seq_retries; /* # unack'd retries */
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u_int32_t keepalive_period; /* in seconds */
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};
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.Ed
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.El
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.Sh SHUTDOWN
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This node shuts down upon receipt of a
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.Dv NGM_SHUTDOWN
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control message, or when all hooks have been disconnected.
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.Sh BUGS
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Not all of the functionality has been implemented. For example,
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the node does not support querying the remote end for its IP address
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and netmask.
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.Sh SEE ALSO
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.Xr netgraph 4 ,
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.Xr ng_iface 8 ,
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.Xr ngctl 8 .
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.Rs
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.%A D. Perkins
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.%T "Requirements for an Internet Standard Point-to-Point Protocol"
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.%O RFC 1547
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.Re
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.Sh LEGAL
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.Tn Cisco
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is a trademark of Cisco Systems, Inc.
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.Sh HISTORY
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The
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.Nm
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node type was implemented in
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.Fx 4.0 .
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.Sh AUTHORS
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.An Julian Elischer Aq julian@whistle.com ,
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.An Archie Cobbs Aq archie@whistle.com
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