user based packet filtering

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Sir/Madam,

Is it possible to do user based packet filtering in Linux
 say i need to allow telnet access to all but i want to block
port
 80(outbound) to some users
 while allowing others ?

 something like packet filter checks first checks uid and
 then apply the
 existing rule ?
 so you may say:
 iptables -A output -p tcp --dport 80 --uid-owner luser -j RE



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