f8307e1233
NGM_BINARY2ASCII, which convert control messages to ASCII and back. This allows control messages to be sent and received in ASCII form using ngctl(8), which makes ngctl a lot more useful. This also allows all the type-specific debugging code in libnetgraph to go away -- instead, we just ask the node itself to do the ASCII translation for us. Currently, all generic control messages are supported, as well as messages associated with the following node types: async, cisco, ksocket, and ppp. See /usr/share/examples/netgraph/ngctl for an example of using this. Also give ngctl(8) the ability to print out incoming data and control messages at any time. Eventually nghook(8) may be subsumed. Several other misc. bug fixes. Reviewed by: julian
161 lines
5.4 KiB
Groff
161 lines
5.4 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 3
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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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``keep alive'' and an ``inquire'' 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 ``inquire'' 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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Cisco is a trademark of Cisco Systems, Inc.
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.Sh AUTHORS
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Julian Elischer <julian@whistle.com>,
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Archie Cobbs <archie@whistle.com>
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