ECN match support

modulename: ipt_ecn.ko

configname: CONFIG_IP_NF_MATCH_ECN

Linux Kernel Configuration
└─>Networking
└─>Networking options
└─>Network packet filtering framework (Netfilter)
└─>IP: Netfilter Configuration
└─>ECN match support
In linux kernel since version 2.6.12  
This option adds a `ECN' match, which allows you to match against
the IPv4 and TCP header ECN fields.

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

source code: