selftests/net: add ipv6 tests to ip_defrag selftest

This patch adds ipv6 defragmentation tests to ip_defrag selftest,
to complement existing ipv4 tests.
Signed-off-by: Peter Oskolkov <posk@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

tools/testing/selftests/net/ip_defrag.sh

@@ -6,23 +6,34 @@
 set +x
 set -e
 
-echo "ipv4 defrag"
+readonly NETNS="ns-$(mktemp -u XXXXXX)"
+
+setup() {
+	ip netns add "${NETNS}"
+	ip -netns "${NETNS}" link set lo up
+	ip netns exec "${NETNS}" sysctl -w net.ipv4.ipfrag_high_thresh=9000000 &> /dev/null
+	ip netns exec "${NETNS}" sysctl -w net.ipv4.ipfrag_low_thresh=7000000 &> /dev/null
+	ip netns exec "${NETNS}" sysctl -w net.ipv6.ip6frag_high_thresh=9000000 &> /dev/null
+	ip netns exec "${NETNS}" sysctl -w net.ipv6.ip6frag_low_thresh=7000000 &> /dev/null
+}
 
-run_v4() {
-sysctl -w net.ipv4.ipfrag_high_thresh=9000000 &> /dev/null
-sysctl -w net.ipv4.ipfrag_low_thresh=7000000 &> /dev/null
-./ip_defrag -4
+cleanup() {
+	ip netns del "${NETNS}"
 }
-export -f run_v4
 
-./in_netns.sh "run_v4"
+trap cleanup EXIT
+setup
+
+echo "ipv4 defrag"
+ip netns exec "${NETNS}" ./ip_defrag -4
+
 
 echo "ipv4 defrag with overlaps"
-run_v4o() {
-sysctl -w net.ipv4.ipfrag_high_thresh=9000000 &> /dev/null
-sysctl -w net.ipv4.ipfrag_low_thresh=7000000 &> /dev/null
-./ip_defrag -4o
-}
-export -f run_v4o
+ip netns exec "${NETNS}" ./ip_defrag -4o
+
+echo "ipv6 defrag"
+ip netns exec "${NETNS}" ./ip_defrag -6
+
+echo "ipv6 defrag with overlaps"
+ip netns exec "${NETNS}" ./ip_defrag -6o
 
-./in_netns.sh "run_v4o"