+################################################################################
+# netfilter blocking connections
+
+netfilter_tcp_reset()
+{
+ local a
+
+ for a in ${NSA_IP} ${VRF_IP}
+ do
+ log_start
+ run_cmd nettest -s &
+ sleep 1
+ run_cmd_nsb nettest -r ${a}
+ log_test_addr ${a} $? 1 "Global server, reject with TCP-reset on Rx"
+ done
+}
+
+netfilter_icmp()
+{
+ local stype="$1"
+ local arg
+ local a
+
+ [ "${stype}" = "UDP" ] && arg="-D"
+
+ for a in ${NSA_IP} ${VRF_IP}
+ do
+ log_start
+ run_cmd nettest ${arg} -s &
+ sleep 1
+ run_cmd_nsb nettest ${arg} -r ${a}
+ log_test_addr ${a} $? 1 "Global ${stype} server, Rx reject icmp-port-unreach"
+ done
+}
+
+ipv4_netfilter()
+{
+ which nettest >/dev/null
+ if [ $? -ne 0 ]; then
+ log_error "nettest not found; skipping tests"
+ return
+ fi
+
+ log_section "IPv4 Netfilter"
+ log_subsection "TCP reset"
+
+ setup "yes"
+ run_cmd iptables -A INPUT -p tcp --dport 12345 -j REJECT --reject-with tcp-reset
+
+ netfilter_tcp_reset
+
+ log_start
+ log_subsection "ICMP unreachable"
+
+ log_start
+ run_cmd iptables -F
+ run_cmd iptables -A INPUT -p tcp --dport 12345 -j REJECT --reject-with icmp-port-unreachable
+ run_cmd iptables -A INPUT -p udp --dport 12345 -j REJECT --reject-with icmp-port-unreachable
+
+ netfilter_icmp "TCP"
+ netfilter_icmp "UDP"
+
+ log_start
+ iptables -F
+}
+