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ng_atmllc - ATM LLC netgraph node type
The atmllc node type translates frames in to and out of ATM LLC
encapsulation, as specified by RFC 1483. In LLC encapsulation the
protocol of a given protocol data unit (PDU) is specified by an IEEE
802.2 LLC header, possibly followed by an IEEE 802.1a SubNetwork
Attachment Point (SNAP) header. This node currently handles the Ethernet
and FDDI protocols.
The node transmits and receives ATM PDUs on the atm hook. Received PDUs
are decoded and forwarded to the ether or fddi hooks as appropriate.
Data received on the ether or fddi hooks are assumed to be full Ethernet
or FDDI packets as appropriate and are encapsulated into a PDU and
transmitted via the atm hook.
This node type supports the following hooks:
atm ATM connection. Typically, this hook would be connected to a
ng_atm(4) node, which handles transmission of ATM PDUs over an
ether Ethernet connection. This hook sends and receives Ethernet
frames. This would normally be connected to an ng_eiface(4) node
if in use.
fddi FDDI connection. This hook sends and receives FDDI frames.
This node type supports the generic control messages.
This node shuts down upon receipt of a NGM_SHUTDOWN control message, or
when all hooks have been disconnected.
netgraph(4), ng_atm(4), ng_eiface(4), ngctl(8)
J. Heinanen, Multiprotocol Encapsulation over ATM Adaptation Layer 5, RFC
Benno Rice 〈benno@FreeBSD.org〉