The VPP bihash supports a key-value pair to provision an entry for a table. For example, see

https://github.com/FDio/vpp/blob/master/src/vppinfra/bihash_48_8.h#L39

However, the VPP classifier entry does not support a value. The use case is the following value for my 5G UPF on matching a classifier entry. Current classifier code with its opaque_index node and metadata cannot support my value.

Also, see https://github.com/FDio/vpp/pull/33