Alter TCP packet not work fine with netfilter hook

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Hi netfilter family,
I'm a newbie to netfilter.
I have just developt a crypto module using netfilter hook.
In this module :
SENDER : IP payload will be encrypted at POST ROUTING hook
RECEIVE : IP payload wil be decrypted at PRE ROUTING hook.

The module work fine with ICMP & UDP but it NOT work fine with TCP: 2
machine still receive packet at hook but application not communicate
together.

I don't know whether any mystery in netfilter or linux network kernel at here?

Thanks :)
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