ng_UI —
UI
netgraph node type
#include
<netgraph/ng_UI.h>
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.
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.
This node type supports only the generic control messages.
This node shuts down upon receipt of a
NGM_SHUTDOWN control message, or when both
hooks have been disconnected.
netgraph(4),
ngctl(8)
The
ng_UI node type was implemented in
FreeBSD 4.0.
Julian Elischer
<
[email protected]>