CONFIG_IP_NF_TARGET_REJECT
NETLINK target support
CONFIG_IP_NF_TARGET_NETLINK
  The NETLINK target allows you to recieve packets in userspace via
  the kernel firewall netlink socket. Apps such as fwmon
  (http://firestorm.geek-ware.co.uk) can then recieve and dislpay
  these packets. This option is basically a re-implementation of the
  ipchains -o option.