Protocol handler using dev_add_pack

[Jerry Yu]

I am working on a kernel module to monitor all TCP packets. I created a protocol
handler with protocol code ETH_P_ALL to handle all incoming and outgoing
TCP packets. The code worked fine on 2.6.14 kernel, but in current 3.2.0-26
kernel, I am no longer able to get the TCP payload for outgoing packets.
The data in TCP payload section of skb->data are mainly 0x00. I am still
able to get incoming TCP packets' payloads though.

Is there any change in 3.2.0 or other early kernel versions that will cause
this issue?

Thanks,

Jerry
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