pf tests: test wildcard anchors

Ensure that a wildcard anchor actually includes any nested anchors (i.e.
foo/* will call into foo/bar).

MFC after:	1 week
Sponsored by:	Rubicon Communications, LLC ("Netgate")
Differential Revision:	https://reviews.freebsd.org/D36414

tests/sys/netpfil/pf/anchor.sh

@@ -93,8 +93,47 @@ nested_anchor_cleanup()
 	pft_cleanup
 }
 
+atf_test_case "wildcard" "cleanup"
+wildcard_head()
+{
+	atf_set descr 'Test wildcard anchors for functionality'
+	atf_set require.user root
+}
+
+wildcard_body()
+{
+	pft_init
+
+	epair=$(vnet_mkepair)
+	vnet_mkjail alcatraz ${epair}a
+
+	ifconfig ${epair}b 192.0.2.2/24 up
+	jexec alcatraz ifconfig ${epair}a 192.0.2.1/24 up
+
+	# Sanity check
+	atf_check -s exit:0 -o ignore ping -c 1 192.0.2.1
+
+	jexec alcatraz pfctl -e
+	pft_set_rules alcatraz \
+		"block" \
+		"anchor \"foo/*\""
+
+	atf_check -s exit:2 -o ignore ping -c 1 192.0.2.1
+
+	echo "pass" | jexec alcatraz pfctl -g -f - -a "foo/bar"
+
+	jexec alcatraz pfctl -sr -a "*"
+	atf_check -s exit:0 -o ignore ping -c 1 192.0.2.1
+}
+
+wildcard_cleanup()
+{
+	pft_cleanup
+}
+
 atf_init_test_cases()
 {
 	atf_add_test_case "pr183198"
 	atf_add_test_case "nested_anchor"
+	atf_add_test_case "wildcard"
 }