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#!/bin/bash
# SPDX-License-Identifier: GPL-2.0
source lib.sh
ret=0
checktool "nft --version" "run test without nft tool"
checktool "iperf3 --version" "run test without iperf3"
setup_ns nsr ns1 ns2
modprobe -q nf_conntrack
cleanup() {
ip netns pids "$ns1" | xargs kill 2>/dev/null
ip netns pids "$ns2" | xargs kill 2>/dev/null
cleanup_all_ns
}
trap cleanup EXIT
ip link add veth0 netns "$nsr" type veth peer name eth0 netns "$ns1"
ip link add veth1 netns "$nsr" type veth peer name eth0 netns "$ns2"
for dev in veth0 veth1; do
ip -net "$nsr" link set "$dev" up
done
ip -net "$nsr" addr add 10.0.1.1/24 dev veth0
ip -net "$nsr" addr add 10.0.2.1/24 dev veth1
ip netns exec "$nsr" sysctl -q net.ipv4.conf.veth0.forwarding=1
ip netns exec "$nsr" sysctl -q net.ipv4.conf.veth1.forwarding=1
ip netns exec "$nsr" sysctl -q net.netfilter.nf_conntrack_tcp_loose=0
for n in $ns1 $ns2; do
ip -net "$n" link set eth0 up
done
ip -net "$ns1" addr add 10.0.1.99/24 dev eth0
ip -net "$ns2" addr add 10.0.2.99/24 dev eth0
ip -net "$ns1" route add default via 10.0.1.1
ip -net "$ns2" route add default via 10.0.2.1
# test basic connectivity
if ! ip netns exec "$ns1" ping -c 1 -q 10.0.2.99 > /dev/null; then
echo "ERROR: $ns1 cannot reach $ns2" 1>&2
exit 1
fi
if ! ip netns exec "$ns2" ping -c 1 -q 10.0.1.99 > /dev/null; then
echo "ERROR: $ns2 cannot reach $ns1" 1>&2
exit 1
fi
ip netns exec "$ns2" iperf3 -s > /dev/null 2>&1 &
# ip netns exec $nsr tcpdump -vvv -n -i veth1 tcp | head -n 10 &
sleep 1
ip netns exec "$nsr" nft -f - <<EOF
table inet filter {
chain prerouting {
type filter hook prerouting priority -300; policy accept;
meta iif veth0 tcp flags syn counter notrack
}
chain forward {
type filter hook forward priority 0; policy accept;
ct state new,established counter accept
meta iif veth0 meta l4proto tcp ct state untracked,invalid synproxy mss 1460 sack-perm timestamp
ct state invalid counter drop
# make ns2 unreachable w.o. tcp synproxy
tcp flags syn counter drop
}
}
EOF
if [ $? -ne 0 ]; then
echo "SKIP: Cannot add nft synproxy"
exit $ksft_skip
fi
if ! ip netns exec "$ns1" timeout 5 iperf3 -c 10.0.2.99 -n $((1 * 1024 * 1024)) > /dev/null; then
echo "FAIL: iperf3 returned an error" 1>&2
ret=1
ip netns exec "$nsr" nft list ruleset
else
echo "PASS: synproxy connection successful"
fi
exit $ret
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