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⟩