netdev - [PATCH net-next v2 2/2] selftests: netfilter: nft_flowtable.sh: Add IPIP flowtable selftest

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Message-Id: <20250627-nf-flowtable-ipip-v2-2-c713003ce75b@kernel.org>
Date: Fri, 27 Jun 2025 14:45:29 +0200
From: Lorenzo Bianconi <lorenzo@...nel.org>
To: "David S. Miller" <davem@...emloft.net>, 
 David Ahern <dsahern@...nel.org>, Eric Dumazet <edumazet@...gle.com>, 
 Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>, 
 Simon Horman <horms@...nel.org>, Pablo Neira Ayuso <pablo@...filter.org>, 
 Jozsef Kadlecsik <kadlec@...filter.org>, Shuah Khan <shuah@...nel.org>
Cc: netdev@...r.kernel.org, netfilter-devel@...r.kernel.org, 
 coreteam@...filter.org, linux-kselftest@...r.kernel.org, 
 Lorenzo Bianconi <lorenzo@...nel.org>
Subject: [PATCH net-next v2 2/2] selftests: netfilter: nft_flowtable.sh:
 Add IPIP flowtable selftest

Introduce specific selftest for IPIP flowtable SW acceleration in
nft_flowtable.sh

Signed-off-by: Lorenzo Bianconi <lorenzo@...nel.org>
---
 .../selftests/net/netfilter/nft_flowtable.sh       | 40 ++++++++++++++++++++++
 1 file changed, 40 insertions(+)

diff --git a/tools/testing/selftests/net/netfilter/nft_flowtable.sh b/tools/testing/selftests/net/netfilter/nft_flowtable.sh
index a4ee5496f2a17cedf1ee71214397012c7906650f..d1c9d3eeda2c9874008f9d6de6cabaabea79b9fb 100755
--- a/tools/testing/selftests/net/netfilter/nft_flowtable.sh
+++ b/tools/testing/selftests/net/netfilter/nft_flowtable.sh
@@ -519,6 +519,44 @@ if ! test_tcp_forwarding_nat "$ns1" "$ns2" 1 ""; then
 	ip netns exec "$nsr1" nft list ruleset
 fi
 
+# IPIP tunnel test:
+# Add IPIP tunnel interfaces and check flowtable acceleration.
+test_ipip() {
+if ! ip -net "$nsr1" link add name tun0 type ipip \
+     local 192.168.10.1 remote 192.168.10.2 >/dev/null;then
+	echo "SKIP: could not add ipip tunnel"
+	[ "$ret" -eq 0 ] && ret=$ksft_skip
+	return
+fi
+ip -net "$nsr1" link set tun0 up
+ip -net "$nsr1" addr add 192.168.100.1/24 dev tun0
+ip netns exec "$nsr1" sysctl net.ipv4.conf.tun0.forwarding=1 > /dev/null
+
+ip -net "$nsr2" link add name tun0 type ipip local 192.168.10.2 remote 192.168.10.1
+ip -net "$nsr2" link set tun0 up
+ip -net "$nsr2" addr add 192.168.100.2/24 dev tun0
+ip netns exec "$nsr2" sysctl net.ipv4.conf.tun0.forwarding=1 > /dev/null
+
+ip -net "$nsr1" route change default via 192.168.100.2
+ip -net "$nsr2" route change default via 192.168.100.1
+ip -net "$ns2" route add default via 10.0.2.1
+
+ip netns exec "$nsr1" nft -a insert rule inet filter forward 'meta oif tun0 accept'
+ip netns exec "$nsr1" nft -a insert rule inet filter forward \
+	'meta oif "veth0" tcp sport 12345 ct mark set 1 flow add @f1 counter name routed_repl accept'
+
+if ! test_tcp_forwarding_nat "$ns1" "$ns2" 1 "IPIP tunnel"; then
+	echo "FAIL: flow offload for ns1/ns2 with IPIP tunnel" 1>&2
+	ip netns exec "$nsr1" nft list ruleset
+	ret=1
+fi
+
+# Restore the previous configuration
+ip -net "$nsr1" route change default via 192.168.10.2
+ip -net "$nsr2" route change default via 192.168.10.1
+ip -net "$ns2" route del default via 10.0.2.1
+}
+
 # Another test:
 # Add bridge interface br0 to Router1, with NAT enabled.
 test_bridge() {
@@ -604,6 +642,8 @@ ip -net "$nsr1" addr add dead:1::1/64 dev veth0 nodad
 ip -net "$nsr1" link set up dev veth0
 }
 
+test_ipip
+
 test_bridge
 
 KEY_SHA="0x"$(ps -af | sha1sum | cut -d " " -f 1)

-- 
2.50.0