Commit 7152303c authored by Florian Westphal's avatar Florian Westphal Committed by Pablo Neira Ayuso
Browse files

selftests: netfilter: add synproxy test 



Simple test for synproxy feature, iperf3 should be intercepted
by synproxy netns, but connection should still succeed.

Signed-off-by: default avatarFlorian Westphal <fw@strlen.de>
Signed-off-by: default avatarPablo Neira Ayuso <pablo@netfilter.org>
parent 7db788ad

tools/testing/selftests/netfilter/Makefile

+1 −1
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@@ -6,7 +6,7 @@ TEST_PROGS := nft_trans_stress.sh nft_fib.sh nft_nat.sh bridge_brouter.sh \ 
	nft_concat_range.sh nft_conntrack_helper.sh \

	nft_queue.sh nft_meta.sh nf_nat_edemux.sh \

	ipip-conntrack-mtu.sh conntrack_tcp_unreplied.sh \

	conntrack_vrf.sh

	conntrack_vrf.sh nft_synproxy.sh



LDLIBS = -lmnl

TEST_GEN_FILES =  nf-queue

tools/testing/selftests/netfilter/nft_synproxy.sh

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+115 −0
Original line number Diff line number Diff line 
#!/bin/bash

# SPDX-License-Identifier: GPL-2.0

#



# Kselftest framework requirement - SKIP code is 4.

ksft_skip=4

ret=0



rnd=$(mktemp -u XXXXXXXX)

nsr="nsr-$rnd"	# synproxy machine

ns1="ns1-$rnd"  # iperf client

ns2="ns2-$rnd"  # iperf server



checktool (){

	if ! $1 > /dev/null 2>&1; then

		echo "SKIP: Could not $2"

		exit $ksft_skip

	fi

}



checktool "nft --version" "run test without nft tool"

checktool "ip -Version" "run test without ip tool"

checktool "iperf3 --version" "run test without iperf3"

checktool "ip netns add $nsr" "create net namespace"



ip netns add $ns1

ip netns add $ns2



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



	ip netns del $nsr

}



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 lo 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 lo up

  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



ip netns exec $ns1 timeout 5 iperf3 -c 10.0.2.99 -n $((1 * 1024 * 1024)) > /dev/null



if [ $? -ne 0 ]; then

	echo "FAIL: iperf3 returned an error" 1>&2

	ret=$?

	ip netns exec $nsr nft list ruleset

else

	echo "PASS: synproxy connection successful"

fi



exit $ret