linux - Android developments of packet routing and control -

i try find method android devices routers goal control packets , implement different routing algorithm. don't know how android os surport. knew, android os includes wifi hotspot features. features limited, there no advance settings routing table, firewall, arp, nat... find app "droidwall" can act firewall each application root permission. means there api developer. can find resources(document or sample code) related developments? features android surport?

i used adb shell make linux command. "droidwall" can implemented using "iptables" command. try write app can make shell command when events occurred . i'm using shell command control now.