tcp network kernel mods

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In TCP, I need to modify the checksum and data fields of every 5th packet.

I don't believe the Netfilter lets me do this, and would rather work straight in the kernel itself.

The packets are generated through the tcp_write-xmit function in TCP_OUTPUT. I have successfully modified the checksum for ALL packets (by playing with tcp_v4_send_check in TCP_IPV4), but, need to whittle it down to every 5th packet only.

Any suggestions on how to implement such a counter? Also, any ideas on replacing the entire TCP data field of every 5th packet?

Thanks in advance.

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