StrongSwan support

[mmikel]

some modules required by strongswan are missing in current 4.4.194 kernel (ip rule doesn't work)

https://docs.strongswan.org/docs/5.9/install/kernelModules.html

[asusiot]

hello @mmikel,
the link you provided returns 404, is there another page we can look into?

[mmikel]

https://docs.strongswan.org/docs/5.9/install/kernelModules.html