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/134224/thc-ipv6-3.0.tar.gz
Source: https://packetstormsecurity.com/files/134224/THC-IPv6-Attack-Tool-3.0.html