[PATCH nf-next v6 6/6] selftests: netfilter: nft_flowtable.sh: add SIT flowtable selftest

Lorenzo Bianconi lorenzo at kernel.org
Mon Jul 13 05:46:23 PDT 2026 

Similar to IPIP, IP6IP6 and IPv4 over IPv6, introduce specific selftest
for SIT flowtable sw acceleration in nft_flowtable.sh.

Also add tunnel-specific flow-add rules for sit1 and sit1.10 so that
check_counters() properly verifies offload occurred, and restore IPv6
default routes at cleanup to prevent tunnel routes leaking to subsequent
tests (e.g. IPsec).

Signed-off-by: Lorenzo Bianconi <lorenzo at kernel.org>
---
 tools/testing/selftests/net/netfilter/config       |  1 +
 .../selftests/net/netfilter/nft_flowtable.sh       | 53 ++++++++++++++++++++++
 2 files changed, 54 insertions(+)

diff --git a/tools/testing/selftests/net/netfilter/config b/tools/testing/selftests/net/netfilter/config
index c3c121b6f300..a212b9edbcd9 100644
--- a/tools/testing/selftests/net/netfilter/config
+++ b/tools/testing/selftests/net/netfilter/config
@@ -35,6 +35,7 @@ CONFIG_IP_SCTP=m
 CONFIG_IPV6=y
 CONFIG_IPV6_MULTIPLE_TABLES=y
 CONFIG_IPV6_TUNNEL=m
+CONFIG_IPV6_SIT=m
 CONFIG_IP_VS=m
 CONFIG_IP_VS_PROTO_TCP=y
 CONFIG_IP_VS_RR=m
diff --git a/tools/testing/selftests/net/netfilter/nft_flowtable.sh b/tools/testing/selftests/net/netfilter/nft_flowtable.sh
index 1cb5c65351b7..cda68070cd00 100755
--- a/tools/testing/selftests/net/netfilter/nft_flowtable.sh
+++ b/tools/testing/selftests/net/netfilter/nft_flowtable.sh
@@ -597,6 +597,10 @@ ip -net "$nsr1" addr add 192.168.210.1/24 dev tun6
 ip -net "$nsr1" addr add fee1:3::1/64 dev tun6 nodad
 ip netns exec "$nsr1" sysctl net.ipv4.conf.tun6.forwarding=1 > /dev/null
 
+ip -net "$nsr1" link add name sit1 type sit local 192.168.10.1 remote 192.168.10.2 ttl 255
+ip -net "$nsr1" link set sit1 up
+ip -net "$nsr1" addr add fe01:3::1/64 dev sit1 nodad
+
 ip -net "$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
@@ -608,6 +612,10 @@ ip -net "$nsr2" addr add 192.168.210.2/24 dev tun6
 ip -net "$nsr2" addr add fee1:3::2/64 dev tun6 nodad
 ip netns exec "$nsr2" sysctl net.ipv4.conf.tun6.forwarding=1 > /dev/null
 
+ip -net "$nsr2" link add name sit1 type sit local 192.168.10.2 remote 192.168.10.1 ttl 255
+ip -net "$nsr2" link set sit1 up
+ip -net "$nsr2" addr add fe01:3::2/64 dev sit1 nodad
+
 ip -net "$nsr1" route change default via 192.168.100.2
 ip -net "$nsr2" route change default via 192.168.100.1
 
@@ -626,6 +634,9 @@ ip netns exec "$nsr1" nft -a insert rule inet filter forward 'meta oif tun0 acce
 ip netns exec "$nsr1" nft -a insert rule inet filter forward \
 	'meta oif tun6 tcp dport 12345 ct mark set 1 flow add @f1 counter name routed_orig accept'
 ip netns exec "$nsr1" nft -a insert rule inet filter forward 'meta oif tun6 accept'
+ip netns exec "$nsr1" nft -a insert rule inet filter forward \
+	'meta oif sit1 tcp dport 12345 ct mark set 1 flow add @f1 counter name routed_orig accept'
+ip netns exec "$nsr1" nft -a insert rule inet filter forward 'meta oif sit1 accept'
 ip netns exec "$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'
 
@@ -652,6 +663,19 @@ if ! test_tcp_forwarding_nat "$ns1" "$ns2" 1 "IP4IP6 tunnel"; then
 	ret=1
 fi
 
+ip -6 -net "$nsr1" route delete default
+ip -6 -net "$nsr1" route add default via fe01:3::2
+ip -6 -net "$nsr2" route delete default
+ip -6 -net "$nsr2" route add default via fe01:3::1
+
+if test_tcp_forwarding "$ns1" "$ns2" 1 6 "[dead:2::99]" 12345; then
+	check_counters "flow offload for ns1/ns2 SIT tunnel"
+else
+	echo "FAIL: flow offload for ns1/ns2 with SIT tunnel" 1>&2
+	ip netns exec "$nsr1" nft list ruleset
+	ret=1
+fi
+
 # Create vlan tagged devices for IPIP traffic.
 ip -net "$nsr1" link add link veth1 name veth1.10 type vlan id 10
 ip -net "$nsr1" link set veth1.10 up
@@ -682,6 +706,13 @@ ip netns exec "$nsr1" nft -a insert rule inet filter forward \
 	'meta oif tun6.10 tcp dport 12345 ct mark set 1 flow add @f1 counter name routed_orig accept'
 ip netns exec "$nsr1" nft -a insert rule inet filter forward 'meta oif tun6.10 accept'
 
+ip -net "$nsr1" link add name sit1.10 type sit local 192.168.20.1 remote 192.168.20.2 ttl 255
+ip -net "$nsr1" link set sit1.10 up
+ip -net "$nsr1" addr add fe01:5::1/64 dev sit1.10 nodad
+ip netns exec "$nsr1" nft -a insert rule inet filter forward \
+	'meta oif sit1.10 tcp dport 12345 ct mark set 1 flow add @f1 counter name routed_orig accept'
+ip netns exec "$nsr1" nft -a insert rule inet filter forward 'meta oif sit1.10 accept'
+
 ip -net "$nsr2" link add link veth0 name veth0.10 type vlan id 10
 ip -net "$nsr2" link set veth0.10 up
 ip -net "$nsr2" addr add 192.168.20.2/24 dev veth0.10
@@ -699,6 +730,11 @@ ip -net "$nsr2" link set tun6.10 up
 ip -net "$nsr2" addr add 192.168.220.2/24 dev tun6.10
 ip -net "$nsr2" addr add fee1:5::2/64 dev tun6.10 nodad
 ip netns exec "$nsr2" sysctl net.ipv4.conf.tun6/10.forwarding=1 > /dev/null
+
+ip -net "$nsr2" link add name sit1.10 type sit local 192.168.20.2 remote 192.168.20.1 ttl 255
+ip -net "$nsr2" link set sit1.10 up
+ip -net "$nsr2" addr add fe01:5::2/64 dev sit1.10 nodad
+
 ip -6 -net "$nsr2" route delete default
 ip -6 -net "$nsr2" route add default via fee1:5::1
 
@@ -725,11 +761,28 @@ if ! test_tcp_forwarding_nat "$ns1" "$ns2" 1 "IP4IP6 tunnel over vlan"; then
 	ret=1
 fi
 
+ip -6 -net "$nsr1" route delete default
+ip -6 -net "$nsr1" route add default via fe01:5::2
+ip -6 -net "$nsr2" route delete default
+ip -6 -net "$nsr2" route add default via fe01:5::1
+
+if test_tcp_forwarding "$ns1" "$ns2" 1 6 "[dead:2::99]" 12345; then
+	check_counters "flow offload for ns1/ns2 SIT tunnel over vlan"
+else
+	echo "FAIL: flow offload for ns1/ns2 with SIT tunnel over vlan" 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
 ip -6 -net "$ns2" route del default via dead:2::1
+ip -6 -net "$nsr1" route delete default
+ip -6 -net "$nsr1" route add default via fee1:2::2
+ip -6 -net "$nsr2" route delete default
+ip -6 -net "$nsr2" route add default via fee1:2::1
 }
 
 # Another test:

-- 
2.55.0

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