selftests: bpf: add a test for XDP redirect

Add test for xdp_redirect by creating two namespaces with two
veth peers, then forward packets in-between.

Signed-off-by: William Tu <u9012063@gmail.com>
Cc: Daniel Borkmann <daniel@iogearbox.net>
Cc: John Fastabend <john.fastabend@gmail.com>
Acked-by: Daniel Borkmann <daniel@iogearbox.net>
Acked-by: John Fastabend <john.fastabend@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 54 insertions, 0 deletions

diff --git a/tools/testing/selftests/bpf/test_xdp_redirect.sh b/tools/testing/selftests/bpf/test_xdp_redirect.sh
new file mode 100755
index 000000000000..d8c73ed6e040
--- /dev/null
+++ b/tools/testing/selftests/bpf/test_xdp_redirect.sh
@@ -0,0 +1,54 @@
+#!/bin/sh
+# Create 2 namespaces with two veth peers, and
+# forward packets in-between using generic XDP
+#
+# NS1(veth11)     NS2(veth22)
+#     |               |
+#     |               |
+#   (veth1, ------ (veth2,
+#   id:111)         id:222)
+#     | xdp forwarding |
+#     ------------------
+
+cleanup()
+{
+	if [ "$?" = "0" ]; then
+		echo "selftests: test_xdp_redirect [PASS]";
+	else
+		echo "selftests: test_xdp_redirect [FAILED]";
+	fi
+
+	set +e
+	ip netns del ns1 2> /dev/null
+	ip netns del ns2 2> /dev/null
+}
+
+set -e
+
+ip netns add ns1
+ip netns add ns2
+
+trap cleanup 0 2 3 6 9
+
+ip link add veth1 index 111 type veth peer name veth11
+ip link add veth2 index 222 type veth peer name veth22
+
+ip link set veth11 netns ns1
+ip link set veth22 netns ns2
+
+ip link set veth1 up
+ip link set veth2 up
+
+ip netns exec ns1 ip addr add 10.1.1.11/24 dev veth11
+ip netns exec ns2 ip addr add 10.1.1.22/24 dev veth22
+
+ip netns exec ns1 ip link set dev veth11 up
+ip netns exec ns2 ip link set dev veth22 up
+
+ip link set dev veth1 xdpgeneric obj test_xdp_redirect.o sec redirect_to_222
+ip link set dev veth2 xdpgeneric obj test_xdp_redirect.o sec redirect_to_111
+
+ip netns exec ns1 ping -c 1 10.1.1.22
+ip netns exec ns2 ping -c 1 10.1.1.11
+
+exit 0