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2.2.2 Standard Message Types

The (netlink standard) module defines the set of standard message types and their data type.

Datatype: error-message
err

The error code, as a negative number.

hdr

The message on which this error applies.

Scheme Variable: no-data

This variable defines the absence of data. This is useful when a structure is expecting a body part, but the protocol specifically defines that it should not take any data in some cases. For instance, a NLMSG_NOOP message takes no data, so the data field of the message will contain this no-data value.