pf tests: Add max states test

Reviewed by:	kp
Differential Revision:	https://reviews.freebsd.org/D46774

tests/sys/netpfil/pf/Makefile

@@ -24,6 +24,7 @@ ATF_TESTS_SH+=	altq \
 		macro \
 		map_e \
 		match \
+		max_states \
 		mbuf \
 		modulate \
 		names \

tests/sys/netpfil/pf/max_states.sh

@@ -0,0 +1,61 @@
+#
+# SPDX-License-Identifier: BSD-2-Clause
+#
+# Copyright (c) 2024 Kajetan Staszkiewicz <vegeta@tuxpowered.net>
+#
+# 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
+
+
+max_states_head()
+{
+	atf_set descr 'Max states per rule'
+	atf_set require.user root
+}
+
+max_states_body()
+{
+	setup_router_dummy_ipv6
+
+	pft_set_rules router \
+		"block" \
+		"pass quick inet6 proto icmp6 icmp6-type { neighbrsol, neighbradv }" \
+		"pass in  on ${epair_tester}b keep state (max 3)" \
+		"pass out on ${epair_server}a keep state"
+
+	# The exact limit is off by 1
+	ping_dummy_check_request exit:0 --ping-type=tcpsyn --send-sport=4201
+	ping_dummy_check_request exit:0 --ping-type=tcpsyn --send-sport=4202
+	ping_dummy_check_request exit:1 --ping-type=tcpsyn --send-sport=4203
+}
+
+max_states_cleanup()
+{
+	pft_cleanup
+}
+
+
+atf_init_test_cases()
+{
+	atf_add_test_case "max_states"
+}