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#!/bin/bash
# SPDX-License-Identifier: GPL-2.0
#
# Check that UNREPLIED tcp conntrack will eventually timeout.
#
# Kselftest framework requirement - SKIP code is 4.
ksft_skip=4
ret=0
waittime=20
sfx=$(mktemp -u "XXXXXXXX")
ns1="ns1-$sfx"
ns2="ns2-$sfx"
nft --version > /dev/null 2>&1
if [ $? -ne 0 ];then
echo "SKIP: Could not run test without nft 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
cleanup() {
ip netns pids $ns1 | xargs kill 2>/dev/null
ip netns pids $ns2 | xargs kill 2>/dev/null
ip netns del $ns1
ip netns del $ns2
}
ipv4() {
echo -n 192.168.$1.2
}
check_counter()
{
ns=$1
name=$2
expect=$3
local lret=0
cnt=$(ip netns exec $ns2 nft list counter inet filter "$name" | grep -q "$expect")
if [ $? -ne 0 ]; then
echo "ERROR: counter $name in $ns2 has unexpected value (expected $expect)" 1>&2
ip netns exec $ns2 nft list counter inet filter "$name" 1>&2
lret=1
fi
return $lret
}
# Create test namespaces
ip netns add $ns1 || exit 1
trap cleanup EXIT
ip netns add $ns2 || exit 1
# Connect the namespace to the host using a veth pair
ip -net $ns1 link add name veth1 type veth peer name veth2
ip -net $ns1 link set netns $ns2 dev veth2
ip -net $ns1 link set up dev lo
ip -net $ns2 link set up dev lo
ip -net $ns1 link set up dev veth1
ip -net $ns2 link set up dev veth2
ip -net $ns2 addr add 10.11.11.2/24 dev veth2
ip -net $ns2 route add default via 10.11.11.1
ip netns exec $ns2 sysctl -q net.ipv4.conf.veth2.forwarding=1
# add a rule inside NS so we enable conntrack
ip netns exec $ns1 iptables -A INPUT -m state --state established,related -j ACCEPT
ip -net $ns1 addr add 10.11.11.1/24 dev veth1
ip -net $ns1 route add 10.99.99.99 via 10.11.11.2
# Check connectivity works
ip netns exec $ns1 ping -q -c 2 10.11.11.2 >/dev/null || exit 1
ip netns exec $ns2 nc -l -p 8080 < /dev/null &
# however, conntrack entries are there
ip netns exec $ns2 nft -f - <<EOF
table inet filter {
counter connreq { }
counter redir { }
chain input {
type filter hook input priority 0; policy accept;
ct state new tcp flags syn ip daddr 10.99.99.99 tcp dport 80 counter name "connreq" accept
ct state new ct status dnat tcp dport 8080 counter name "redir" accept
}
}
EOF
if [ $? -ne 0 ]; then
echo "ERROR: Could not load nft rules"
exit 1
fi
ip netns exec $ns2 sysctl -q net.netfilter.nf_conntrack_tcp_timeout_syn_sent=10
echo "INFO: connect $ns1 -> $ns2 to the virtual ip"
ip netns exec $ns1 bash -c 'while true ; do
nc -p 60000 10.99.99.99 80
sleep 1
done' &
sleep 1
ip netns exec $ns2 nft -f - <<EOF
table inet nat {
chain prerouting {
type nat hook prerouting priority 0; policy accept;
ip daddr 10.99.99.99 tcp dport 80 redirect to :8080
}
}
EOF
if [ $? -ne 0 ]; then
echo "ERROR: Could not load nat redirect"
exit 1
fi
count=$(ip netns exec $ns2 conntrack -L -p tcp --dport 80 2>/dev/null | wc -l)
if [ $count -eq 0 ]; then
echo "ERROR: $ns2 did not pick up tcp connection from peer"
exit 1
fi
echo "INFO: NAT redirect added in ns $ns2, waiting for $waittime seconds for nat to take effect"
for i in $(seq 1 $waittime); do
echo -n "."
sleep 1
count=$(ip netns exec $ns2 conntrack -L -p tcp --reply-port-src 8080 2>/dev/null | wc -l)
if [ $count -gt 0 ]; then
echo
echo "PASS: redirection took effect after $i seconds"
break
fi
m=$((i%20))
if [ $m -eq 0 ]; then
echo " waited for $i seconds"
fi
done
expect="packets 1 bytes 60"
check_counter "$ns2" "redir" "$expect"
if [ $? -ne 0 ]; then
ret=1
fi
if [ $ret -eq 0 ];then
echo "PASS: redirection counter has expected values"
else
echo "ERROR: no tcp connection was redirected"
fi
exit $ret
|
