ng_ui(4)

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 up

stream.

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>

BSD January 19, 1999

BSD