tests: shell: add a test case for netdev ruleset flush + parallel link down

Test for bug added with kernel commit
c03d278fdf35 ("netfilter: nf_tables: wait for rcu grace period on net_device removal")

Signed-off-by: Florian Westphal <fw@strlen.de>

2 files changed, 48 insertions, 0 deletions

diff --git a/tests/shell/testcases/chains/dumps/netdev_chain_dev_addremove.nodump b/tests/shell/testcases/chains/dumps/netdev_chain_dev_addremove.nodump
new file mode 100644
index 00000000..e69de29b
--- /dev/null
+++ b/tests/shell/testcases/chains/dumps/netdev_chain_dev_addremove.nodump
diff --git a/tests/shell/testcases/chains/netdev_chain_dev_addremove b/tests/shell/testcases/chains/netdev_chain_dev_addremove
new file mode 100755
index 00000000..14260d54
--- /dev/null
+++ b/tests/shell/testcases/chains/netdev_chain_dev_addremove
@@ -0,0 +1,48 @@
+#!/bin/bash
+
+# NFT_TEST_REQUIRES(NFT_TEST_HAVE_inet_ingress)
+
+set -e
+
+iface_cleanup() {
+        ip link del d0 &>/dev/null || :
+}
+trap 'iface_cleanup' EXIT
+
+load_rules()
+{
+$NFT -f - <<EOF
+add table netdev nm-mlag-dummy0
+add set netdev nm-mlag-dummy0 macset-tagged { typeof ether saddr . vlan id; size 65535; flags dynamic,timeout; }
+add set netdev nm-mlag-dummy0 macset-untagged { typeof ether saddr; size 65535; flags dynamic,timeout; }
+add chain netdev nm-mlag-dummy0 tx-snoop-source-mac { type filter hook egress devices = { dummy0 } priority filter; policy accept; }
+add rule netdev nm-mlag-dummy0 tx-snoop-source-mac update @macset-tagged { ether saddr . vlan id timeout 5s } return
+add rule netdev nm-mlag-dummy0 tx-snoop-source-mac update @macset-untagged { ether saddr timeout 5s }
+add chain netdev nm-mlag-dummy0 rx-drop-looped-packets { type filter hook ingress devices = { dummy0 } priority filter; policy accept; }
+add rule netdev nm-mlag-dummy0 rx-drop-looped-packets ether saddr . vlan id @macset-tagged drop
+add rule netdev nm-mlag-dummy0 rx-drop-looped-packets ether type 8021q return
+add rule netdev nm-mlag-dummy0 rx-drop-looped-packets ether saddr @macset-untagged drop
+EOF
+}
+
+for i in $(seq 1 500);do
+	read taint < /proc/sys/kernel/tainted
+	if [ "$taint" -ne 0 ]; then
+		exit 1
+	fi
+	ip link add dummy0 type dummy
+	load_rules
+
+	# zap ruleset and down device at same time
+	$NFT flush ruleset &
+	ip link del dummy0 &
+	wait
+done
+
+read taint < /proc/sys/kernel/tainted
+
+if [ "$taint" -ne 0 ]; then
+	exit 1
+fi
+
+exit 0