Hi,
I make a supplementary explanation.
Finally, my purpose is to make "Pseudo 3-Way Handshake".
At first, a user process create a socket (with socket())
and make it TCP_LISTEN (with listen()).
Next, I'd like to make it's status CONNECTED without any
external computers for some reason. In order to do this,
it's necessary that the Linux Kernel believes a SYN packet
has come. So, of cource, to handle a SYN+ACK pakcet and to
reply an ACK packet are required.
If netfilter cannot generate packets out of nothing,
I think to take the following way:
1. My module call netif_receive_skb() directly to send a SYN packet.
2. Kernel replys a SYN+ACK packet,
and my module catches it with netfilter.
3. My module DROPs the packet,
and my module replys an ACK packet with netif_receive_skb().
But it seems to be a little hard. I'm happy if it can be done
with netfilter.
--
Dai MIKURUBE
dmikurube@xxxxxxx
