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Subject[PATCH] selftests: netfilter: Add RFC-7597 Section 5.1 PSID selftests
Date
Add selftests for masquerading into a smaller subset of ports defined by
PSID.

Signed-off-by: Cole Dishington <Cole.Dishington@alliedtelesis.co.nz>
---
.../netfilter/nat_masquerade_psid.sh | 158 ++++++++++++++++++
1 file changed, 158 insertions(+)
create mode 100644 tools/testing/selftests/netfilter/nat_masquerade_psid.sh

diff --git a/tools/testing/selftests/netfilter/nat_masquerade_psid.sh b/tools/testing/selftests/netfilter/nat_masquerade_psid.sh
new file mode 100644
index 000000000000..90e2e5ca4d68
--- /dev/null
+++ b/tools/testing/selftests/netfilter/nat_masquerade_psid.sh
@@ -0,0 +1,158 @@
+#!/bin/bash
+# SPDX-License-Identifier: GPL-2.0
+#
+# <:copyright-gpl
+# Copyright (C) 2021 Allied Telesis Labs NZ
+#
+# check that NAT can masquerade using PSID defined ranges.
+#
+# Setup is:
+#
+# nsclient1(veth0) -> (veth1)nsrouter(veth2) -> (veth0)nsclient2
+# Setup a nat masquerade rule with psid defined ranges.
+#
+
+# Kselftest framework requirement - SKIP code is 4.
+ksft_skip=4
+ret=0
+ns_all="nsclient1 nsrouter nsclient2"
+
+readonly infile="$(mktemp)"
+readonly outfile="$(mktemp)"
+readonly datalen=32
+readonly server_port=8080
+
+conntrack -V > /dev/null 2>&1
+if [ $? -ne 0 ];then
+ echo "SKIP: Could not run test without conntrack tool"
+ exit $ksft_skip
+fi
+
+iptables --version > /dev/null 2>&1
+if [ $? -ne 0 ];then
+ echo "SKIP: Could not run test without iptables tool"
+ exit $ksft_skip
+fi
+
+ip -Version > /dev/null 2>&1
+if [ $? -ne 0 ];then
+ echo "SKIP: Could not run test without ip tool"
+ exit $ksft_skip
+fi
+
+ipv4() {
+ echo -n 192.168.$1.$2
+}
+
+cleanup() {
+ for n in $ns_all; do ip netns del $n;done
+
+ if [ -f "${outfile}" ]; then
+ rm "$outfile"
+ fi
+ if [ -f "${infile}" ]; then
+ rm "$infile"
+ fi
+}
+
+server_listen() {
+ ip netns exec nsclient2 nc -l -p "$server_port" > "$outfile" &
+ server_pid=$!
+ sleep 0.2
+}
+
+client_connect() {
+ ip netns exec nsclient1 timeout 2 nc -w 1 -p "$port" $(ipv4 2 2) "$server_port" < $infile
+}
+
+verify_data() {
+ local _ret=0
+ wait "$server_pid"
+ cmp "$infile" "$outfile" 2>/dev/null
+ _ret=$?
+ rm "$outfile"
+ return $_ret
+}
+
+test_service() {
+ server_listen
+ client_connect
+ verify_data
+}
+
+check_connection() {
+ entry=$(ip netns exec nsrouter conntrack -p tcp --sport $port -L 2>&1)
+ entry=${entry##*sport=8080 dport=}
+ entry=${entry%% *}
+ [[ "x$(( ($entry & $psid_mask) / $two_power_j ))" = "x$psid" ]]
+}
+
+run_test() {
+ ip netns exec nsrouter iptables -A FORWARD -i veth1 -j ACCEPT
+ ip netns exec nsrouter iptables -P FORWARD DROP
+ ip netns exec nsrouter iptables -A FORWARD -m state --state ESTABLISHED,RELATED -j ACCEPT
+ ip netns exec nsrouter iptables -t nat --new psid
+ ip netns exec nsrouter iptables -t nat --insert psid -j MASQUERADE --psid $offset:$psid:$psid_length
+ ip netns exec nsrouter iptables -t nat -I POSTROUTING -o veth2 -j psid
+
+ # calculate psid mask
+ two_power_j=$(( $offset / (1 << $psid_length) ))
+ psid_mask=$(( ( (1 << $psid_length) - 1) * $two_power_j ))
+
+ # Create file
+ dd if=/dev/urandom of="${infile}" bs="${datalen}" count=1 >/dev/null 2>&1
+
+ # Test multiple ports
+ for p in 1 2 3 4 5; do
+ port=1080$p
+
+ test_service
+ if [ $? -ne 0 ]; then
+ ret=1
+ break
+ fi
+
+ check_connection
+ if [ $? -ne 0 ]; then
+ ret=1
+ break
+ fi
+ done
+
+ # tidy up test rules
+ ip netns exec nsrouter iptables -F
+ ip netns exec nsrouter iptables -t nat -F
+ ip netns exec nsrouter iptables -t nat -X psid
+}
+
+for n in $ns_all; do
+ ip netns add $n
+ ip -net $n link set lo up
+done
+
+for i in 1 2; do
+ ip link add veth0 netns nsclient$i type veth peer name veth$i netns nsrouter
+
+ ip -net nsclient$i link set veth0 up
+ ip -net nsclient$i addr add $(ipv4 $i 2)/24 dev veth0
+
+ ip -net nsrouter link set veth$i up
+ ip -net nsrouter addr add $(ipv4 $i 1)/24 dev veth$i
+done
+
+ip -net nsclient1 route add default via $(ipv4 1 1)
+ip -net nsclient2 route add default via $(ipv4 2 1)
+
+ip netns exec nsrouter sysctl -q net.ipv4.conf.all.forwarding=1
+
+offset=1024
+psid_length=8
+for psid in 0 52; do
+ run_test
+ if [ $? -ne 0 ]; then
+ break
+ fi
+done
+
+cleanup
+exit $ret
--
2.32.0
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