"helper" match support

modulename: xt_helper.ko


Linux Kernel Configuration
└─>Networking support
└─>Networking options
└─>Network packet filtering framework (Netfilter)
└─>Core Netfilter Configuration
└─>"helper" match support
In linux kernel since version 2.6.16 (release Date: 2006-03-19)  
Helper matching allows you to match packets in dynamic connections
tracked by a conntrack-helper, ie. nf_conntrack_ftp

To compile it as a module, choose M here. If unsure, say Y.

source code: