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   iptables    ( 8 )

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TARGETS

A firewall rule specifies criteria for a packet and a target.  If
       the packet does not match, the next rule in the chain is
       examined; if it does match, then the next rule is specified by
       the value of the target, which can be the name of a user-defined
       chain, one of the targets described in iptables-extensions(8), or
       one of the special values ACCEPT, DROP or RETURN.

       ACCEPT means to let the packet through.  DROP means to drop the
       packet on the floor.  RETURN means stop traversing this chain and
       resume at the next rule in the previous (calling) chain.  If the
       end of a built-in chain is reached or a rule in a built-in chain
       with target RETURN is matched, the target specified by the chain
       policy determines the fate of the packet.