How to add support to strongSwan IPsec

[MarkHaysHarris777]

So, how to insert these modules or should I recompile the kernel from the beginning.

First, to answer the question you didn't ask;  Yes, you can use VPN without using strongswan.

...  you may need the IPsec-based VPN solution;  but I would try to avoid it.   On the other hand, if you need the modules you listed then you will have to compile them in;  good thing strongswan is open source.