Statistics collector for Iptables. It records how many packets and bytes passed for given range of IPs (subnet). Each IP is counted separately. Data can be read via procfs from /proc/net/ipt_STATS/ directory. Kernel module is named xt_STATS.ko.
(should work with linux versions 2.6.27 〰 2.6.37)
Gateway matching module for Iptables. Tells whether nexthop of datagram's route is within given range. Note that directly accessible hosts serve as gateways for themselves.
(not up to date due to permanent API changes, sorry)