Kernel Lock Manager Protocol (KLM)

The KLM protocol is used to manage lock requests between the VFS layer in the kernel of a ["NFS"] host and the userspace lock manager daemon. This protocol is only used across the loopback interface and will never bee seen on a network.

History

This protocol was developed at the same time as ["NLM"] and is semi-similar to ["NLM"].

Protocol dependencies

Example traffic

XXX - Add example traffic here as plain text or Ethereal screenshot).

Ethereal

The KLM dissector is fully functional.

Preference Settings

There are no preferences for the KLM protocol itself, but since it shares the filehandle structure with ["NFS"] there are some ["NFS"] preferences related to filehandles that do affect the dissection of KLM. BR See ["NFS Preferences"]

Example capture file

attachment:SampleCaptures/klm.pcap.gz

Display Filter

A complete list of PROTO display filter fields can be found in the [http://www.ethereal.com/docs/dfref/PROTO/PROTO.html display filter reference]

Capture Filter

You cannot directly filter KLM while capturing. However, if you know the ["UDP"] port used (see above), you can filter on that one. KLM only exists ontop of the loopback interface so one can only capture KLM on a host that allows capturing of loopback.

A KLM specification does not exist, however most unixen do have an interface specification for the protocol in /usr/include/rpcsvc

Discussion