net-vpn/
ipsec-tools

A port of KAME's IPsec utilities to the Linux-2.6 IPsec implementation

http://ipsec-tools.sourceforge.net/

There are no pull requests

You think something is missing here?
Start with filling a new pull requests.

If you also like to help the Gentoo project, you can consider sending a Pull Request via GitHub.
Before doing so, you might want to take a look at the wiki page.