pf tests: Basic source tracking test

MFC after:	1 week
Differential Revision:	https://reviews.freebsd.org/D27255

tests/sys/netpfil/pf/Makefile

@@ -12,6 +12,7 @@ ATF_TESTS_SH+=	anchor \
 		names \
 		nat \
 		set_tos \
+		src_track \
 		rdr \
 		route_to \
 		synproxy \

tests/sys/netpfil/pf/src_track.sh

@@ -0,0 +1,66 @@
+# $FreeBSD$
+#
+# SPDX-License-Identifier: BSD-2-Clause-FreeBSD
+#
+# Copyright (c) 2020 Kristof Provost <kp@FreeBSD.org>
+#
+# Redistribution and use in source and binary forms, with or without
+# modification, are permitted provided that the following conditions
+# are met:
+# 1. Redistributions of source code must retain the above copyright
+#    notice, this list of conditions and the following disclaimer.
+# 2. Redistributions in binary form must reproduce the above copyright
+#    notice, this list of conditions and the following disclaimer in the
+#    documentation and/or other materials provided with the distribution.
+#
+# THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+# ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+# ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+# FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+# DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+# OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+# HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+# OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+# SUCH DAMAGE.
+
+. $(atf_get_srcdir)/utils.subr
+
+atf_test_case "source_track" "cleanup"
+source_track_head()
+{
+	atf_set descr 'Basic source tracking test'
+	atf_set require.user root
+}
+
+source_track_body()
+{
+	pft_init
+
+	epair=$(vnet_mkepair)
+
+	vnet_mkjail alcatraz ${epair}b
+
+	ifconfig ${epair}a 192.0.2.2/24 up
+	jexec alcatraz ifconfig ${epair}b 192.0.2.1/24 up
+
+	# Enable pf!
+	jexec alcatraz pfctl -e
+	pft_set_rules alcatraz \
+		"pass in keep state (source-track)" \
+		"pass out keep state (source-track)"
+
+	ping -c 3 192.0.2.1
+	jexec alcatraz pfctl -s all -v
+}
+
+source_track_cleanup()
+{
+	pft_cleanup
+}
+
+atf_init_test_cases()
+{
+	atf_add_test_case "source_track"
+}