pf tests: basic SCTP connection test

pf can now inspect SCTP. Check that we can set up a connection.
IPv4 and IPv6 tests.

MFC after:	3 weeks
Sponsored by:	Orange Business Services
Differential Revision:	https://reviews.freebsd.org/D40863

tests/sys/netpfil/pf/Makefile

@@ -31,6 +31,7 @@ ATF_TESTS_SH+=	altq \
 		rules_counter \
 		scrub_compat \
 		scrub_pass \
+		sctp \
 		set_skip \
 		set_tos \
 		src_track \

tests/sys/netpfil/pf/sctp.sh

@@ -0,0 +1,190 @@
+# $FreeBSD$
+#
+# SPDX-License-Identifier: BSD-2-Clause-FreeBSD
+#
+# Copyright © 2023 Orange Business Services
+#
+# 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.
+
+. $(atf_get_srcdir)/utils.subr
+
+sctp_init()
+{
+	pft_init
+	if ! kldstat -q -m sctp; then
+		atf_skip "This test requires SCTP"
+	fi
+}
+
+atf_test_case "basic_v4" "cleanup"
+basic_v4_head()
+{
+	atf_set descr 'Basic SCTP connection over IPv4 passthrough'
+	atf_set require.user root
+}
+
+basic_v4_body()
+{
+	sctp_init
+
+	j="sctp:basic_v4"
+	epair=$(vnet_mkepair)
+
+	vnet_mkjail ${j}a ${epair}a
+	vnet_mkjail ${j}b ${epair}b
+
+	jexec ${j}a ifconfig ${epair}a 192.0.2.1/24 up
+	jexec ${j}b ifconfig ${epair}b 192.0.2.2/24 up
+	# Sanity check
+	atf_check -s exit:0 -o ignore \
+	    jexec ${j}a ping -c 1 192.0.2.2
+
+	jexec ${j}a pfctl -e
+	pft_set_rules ${j}a \
+		"block" \
+		"pass in proto sctp to port 1234"
+
+	echo "foo" | jexec ${j}a nc --sctp -N -l 1234 &
+
+	# Wait for the server to start
+	sleep 1
+
+	out=$(jexec ${j}b nc --sctp -N -w 3 192.0.2.1 1234)
+	if [ "$out" != "foo" ]; then
+		atf_fail "SCTP connection failed"
+	fi
+
+	# Now with scrub rules present, so normalization is done
+	pft_set_rules ${j}a \
+		"scrub on ${j}a" \
+		"block" \
+		"pass in proto sctp to port 1234"
+
+	echo "foo" | jexec ${j}a nc --sctp -N -l 1234 &
+	sleep 1
+
+	out=$(jexec ${j}b nc --sctp -N -w 3 192.0.2.1 1234)
+	if [ "$out" != "foo" ]; then
+		atf_fail "SCTP connection failed"
+	fi
+
+	# Now fail with a blocked port
+	echo "foo" | jexec ${j}a nc --sctp -N -l 1235 &
+	sleep 1
+
+	out=$(jexec ${j}b nc --sctp -N -w 3 192.0.2.1 1235)
+	if [ "$out" == "foo" ]; then
+		atf_fail "SCTP port block failed"
+	fi
+
+	# Now fail with a blocked port but passing source port
+	out=$(jexec ${j}b nc --sctp -N -w 3 -p 1234 192.0.2.1 1235)
+	if [ "$out" == "foo" ]; then
+		atf_fail "SCTP port block failed"
+	fi
+}
+
+basic_v4_cleanup()
+{
+	pft_cleanup
+}
+
+atf_test_case "basic_v6" "cleanup"
+basic_v6_head()
+{
+	atf_set descr 'Basic SCTP connection over IPv6'
+	atf_set require.user root
+}
+
+basic_v6_body()
+{
+	sctp_init
+
+	j="sctp:basic_v6"
+	epair=$(vnet_mkepair)
+
+	vnet_mkjail ${j}a ${epair}a
+	vnet_mkjail ${j}b ${epair}b
+
+	jexec ${j}a ifconfig ${epair}a inet6 2001:db8::a/64 up no_dad
+	jexec ${j}b ifconfig ${epair}b inet6 2001:db8::b/64 up no_dad
+
+	# Sanity check
+	atf_check -s exit:0 -o ignore \
+	    jexec ${j}a ping -6 -c 1 2001:db8::b
+
+	jexec ${j}a pfctl -e
+	pft_set_rules ${j}a \
+		"block proto sctp" \
+		"pass in proto sctp to port 1234"
+
+	echo "foo" | jexec ${j}a nc -6 --sctp -N -l 1234 &
+
+	# Wait for the server to start
+	sleep 1
+
+	out=$(jexec ${j}b nc --sctp -N -w 3 2001:db8::a 1234)
+	if [ "$out" != "foo" ]; then
+		atf_fail "SCTP connection failed"
+	fi
+
+	# Now with scrub rules present, so normalization is done
+	pft_set_rules ${j}a \
+		"scrub on ${j}a" \
+		"block proto sctp" \
+		"pass in proto sctp to port 1234"
+
+	echo "foo" | jexec ${j}a nc -6 --sctp -N -l 1234 &
+	sleep 1
+
+	out=$(jexec ${j}b nc --sctp -N -w 3 2001:db8::a 1234)
+	if [ "$out" != "foo" ]; then
+		atf_fail "SCTP connection failed"
+	fi
+
+	# Now fail with a blocked port
+	echo "foo" | jexec ${j}a nc -6 --sctp -N -l 1235 &
+	sleep 1
+
+	out=$(jexec ${j}b nc --sctp -N -w 3 2001:db8::a 1235)
+	if [ "$out" == "foo" ]; then
+		atf_fail "SCTP port block failed"
+	fi
+
+	# Now fail with a blocked port but passing source port
+	out=$(jexec ${j}b nc --sctp -N -w 3 -p 1234 2001:db8::a 1235)
+	if [ "$out" == "foo" ]; then
+		atf_fail "SCTP port block failed"
+	fi
+}
+
+basic_v6_cleanup()
+{
+	pft_cleanup
+}
+
+
+atf_init_test_cases()
+{
+	atf_add_test_case "basic_v4"
+	atf_add_test_case "basic_v6"
+}