|| FreeBSD Kernel Interfaces Manual
UI netgraph node type
node type has two hooks,
. Packets received on
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
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 connection. Packets on this side of the node have a 0x03 as their first byte.
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.
ng_UI node type was implemented in