NAME

       ng_UI — UI netgraph node type

SYNOPSIS

       #include <netgraph/ng_UI.h>

DESCRIPTION

       The  UI  node type has two hooks, upstream and downstream.  Packets received on downstream must have 0x03
       (indicating unnumbered information) as their first byte; if not the packet is dropped.  This byte is then
       stripped and the remainder of the packet sent out on upstream.

       Conversely, packets received on upstream will have a 0x03 byte prepended to them before  being  forwarded
       out on the downstream hook.

HOOKS

       This node type supports the following hooks:

       downstream  Downstream connection.  Packets on this side of the node have a 0x03 as their first byte.

       upstream    Upstream  connection.   Packets  on this side of the node have the initial 0x03 byte stripped
                   off.

CONTROL MESSAGES

       This node type supports only the generic control messages.

SHUTDOWN

       This node shuts down upon receipt of a NGM_SHUTDOWN  control  message,  or  when  both  hooks  have  been
       disconnected.

SEE ALSO

       netgraph(4), ngctl(8)

HISTORY

       The ng_UI node type was implemented in FreeBSD 4.0.

AUTHORS

       Julian Elischer <julian@FreeBSD.org>

Debian                                          January 19, 1999                                        NG_UI(4)