Hi all,
I am writing a device driver which requires me to add a new header in
between the IP header and the MAC header (ethernet).
Now, i dont want to modify the original sk_buff structure to add a pointer
to this header. What i have done instead is to specify the
'hard_header_len' of this device to be equal to the sum of MAC and custom
header lengths.
ie. mydevice->hard_header_len = MAC header length + myheader length
Now when i transmit these packets using dev_queue_xmit (which in turn
calls the hard_start_xmit function of eth0), my packets arrive mangled at
the destination machine. Essentially the IP header pointer
(nh.raw/nh.iph) is pointing to 'myheader'instead of to the IP header
which starts after 16 bytes.
Any comments or suggestions on this approach will be appreciated.
Regards,
Amit
--
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Amit Kucheria
EECS Grad. Research Assistant
Team Niehaus || Room # 245E
University of Kansas @ Lawrence
(R)+1-(785)-830 8521 ||| (O)+1-(785)-864 7774
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