Packet mangling

modulename: ip6table_mangle.ko

configname: CONFIG_IP6_NF_MANGLE

Linux Kernel Configuration
└─>Networking support
└─>Networking options
└─>Network packet filtering (replaces ipchains)
└─>IPv6: Netfilter Configuration (EXPERIMENTAL)
└─>Packet mangling
In linux kernel since version 2.6.12  
This option adds a `mangle' table to iptables: see the man page for
iptables(8). This table is used for various packet alterations
which can effect how the packet is routed.

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

source code:
net/ipv6/netfilter/ip6table_mangle.c

is selected by
CONFIG_IP6_NF_TARGET_HL