Re: IPFW2 layer2 filtering broken - PATCH

[Joerg Sonnenberger <joerg@xxxxxxxxxxxxxxxxx>]

On Mon, Jan 24, 2005 at 09:50:05AM -0800, Matthew Dillon wrote:
>     From my read of the code, the 'eh = mtod(...)' is necessary, but 
>     most of the time the returned 'm' will be the same as the passed 'm'
>     so I am not surprised that you did not see any difference.

The eh = mtod() is necessary, because the ether header might not actually be
part of the passed in header. Because ether_ifpw_chk changes that by
prepending the header, it is necessary to update the pointer in the caller.

Joerg