THC-IPv6 is a toolkit that attacks the inherent protocol weaknesses of IPv6 and ICMP6 and it includes an easy to use packet factory library.
You can download it from the following link: https://packetstormsecurity.com/files/download/119116/thc-ipv6-2.1.tar.gz
Source: https://packetstormsecurity.com/files/119116/THC-IPv6-Attack-Tool-2.1.html