Re: user-space ipsec implementation using netfilter_firewall

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On Saturday 2011-10-08 08:50, Prashant Batra wrote:

>Hello,
>
>I am thinking to implement user-space IPSec using NETLINK_FIREWALL
>protocol. This is how, I am thinking to proceed-
>
>-Get the plain packet sent out using OUTPUT rule with QUEUE target in
>the user space. Encapsulate the packet and send out ESP packet.
>-Similarly get the ESP packet sent from the peer gateway, get it into
>user space with INPUT ESP based rule, decrypt the packet
>and send it to the application using raw sockets.
>
>But I have some doubts whether this will work just fine or not.

_Outputting_ data to a raw socket fd is not going to make it appear in 
the _input path_.

Don't make it more complicated than it needs to be.

The kernel ESP encoder/decoder works just fine.
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