>One thing I did notice was the packets did not seem to have correct
>checksums.  Have I picked the wrong place for intercepting IPv4 packets ?

	to me bpf_mtap() in the middle of ip_input() seems to be the cause.

>Also, where on earth is the correct place in the KAME IPv6 code to add
>similar hooks ?  I had a look but it was not clear where to go..

	i don't think we should put any bpf_mtap() into ip*_input().  it
	belongs to layer 2, not layer 3.

itojun