pf tests: basic source limiters test case

Sponsored by:	Rubicon Communications, LLC ("Netgate")

tests/sys/netpfil/pf/limiters.sh

@@ -130,8 +130,66 @@ state_rate_cleanup()
 	pft_cleanup
 }
 
+atf_test_case "source_basic" "cleanup"
+source_basic_head()
+{
+	atf_set descr 'Basic source limiter test'
+	atf_set require.user root
+}
+
+source_basic_body()
+{
+	pft_init
+
+	epair=$(vnet_mkepair)
+
+	ifconfig ${epair}a 192.0.2.2/24 up
+	ifconfig ${epair}a inet alias 192.0.2.3/24 up
+
+	vnet_mkjail alcatraz ${epair}b
+	jexec alcatraz ifconfig ${epair}b 192.0.2.1/24 up
+
+	# Sanity check
+	atf_check -s exit:0 -o ignore \
+	    ping -S 192.0.2.2 -c 1 192.0.2.1
+	atf_check -s exit:0 -o ignore \
+	    ping -S 192.0.2.3 -c 1 192.0.2.1
+
+	jexec alcatraz pfctl -e
+
+	# Allow up to one source for ICMP.
+	pft_set_rules alcatraz \
+	    "set timeout icmp.error 120" \
+	    "source limiter \"server\" id 1 entries 128 limit 1" \
+	    "block in proto icmp" \
+	    "pass in proto icmp source limiter \"server\""
+
+	atf_check -s exit:0 -o ignore \
+	    ping -S 192.0.2.2 -c 2 192.0.2.1
+
+	# This should now fail
+	atf_check -s exit:2 -o ignore \
+	    ping -S 192.0.2.2 -c 2 192.0.2.1
+
+	jexec alcatraz pfctl -sLimiterSrcs
+	hardlim=$(jexec alcatraz pfctl -sLimiterSrcs | awk 'NR>1 { print $5; }')
+	if [ $hardlim -eq 0 ]; then
+		atf_fail "Hard limit not incremented"
+	fi
+
+	# However, a different source will succeed
+	atf_check -s exit:0 -o ignore \
+	    ping -S 192.0.2.3 -c 2 192.0.2.1
+}
+
+source_basic_cleanup()
+{
+	pft_cleanup
+}
+
 atf_init_test_cases()
 {
 	atf_add_test_case "state_basic"
 	atf_add_test_case "state_rate"
+	atf_add_test_case "source_basic"
 }