On Tue, Nov 28, 2000 at 11:53:08AM +0200, Richard Jones wrote:
> I've written a module that steals packets at the net_bh (via proto
> handler) and hard_start_xmit points. I massage this data before
> injecting it back into the network. At the moment I'm testing this
> with ping. All works fine until packet sizes reach the MTU (1500, I'm
> on ethernet). At this point it appears that the fragmented echo reply
> packets are only getting a skb_headroom of 2 , where previously this
> was 16 when unfragmented, the echo reply fragments also appear to have
> grown larger than MTU (1514). I realise there are other mechanisms of
> achieving what I'm after, however they are both too high up the stack
> and lack efficient kernel<->userland transfers. Anyways I've been
> chasing this for a few days and wondered if anyone had some hints
> about what might be going wrong or at least where to look.
Sounds like 14 octets of Ethernet header to me.
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