I would like to intercept incoming packets on the wifi link and do XOR operations on the TCP payload in transit.
Currently I am wondering if it's possible to use iptables or netfilter to get that type of functionality. I've seen scripts that let you modify TTL headers and compute checksums, but I want to be able to access the data payload itself. Is there an easy solution for ddwrt or openwrt?
Alternatively, is there any similar project with opensource code which I could borrow and tweak?