selftests/bpf: Add netkit tests for mac address

This adds simple tests around setting MAC addresses in the different
netkit modes.

Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Link: https://lore.kernel.org/r/20240524163619.26001-3-daniel@iogearbox.net
Signed-off-by: Alexei Starovoitov <ast@kernel.org>

tools/testing/selftests/bpf/prog_tests/tc_netkit.c

@@ -73,6 +73,16 @@ static int create_netkit(int mode, int policy, int peer_policy, int *ifindex,
  "up primary");
  ASSERT_OK(system("ip addr add dev " netkit_name " 10.0.0.1/24"),
  "addr primary");
+
+ if (mode == NETKIT_L3) {
+ ASSERT_EQ(system("ip link set dev " netkit_name
+ " addr ee:ff:bb:cc:aa:dd 2> /dev/null"), 512,
+ "set hwaddress");
+ } else {
+ ASSERT_OK(system("ip link set dev " netkit_name
+ " addr ee:ff:bb:cc:aa:dd"),
+ "set hwaddress");
+ }
  if (same_netns) {
  ASSERT_OK(system("ip link set dev " netkit_peer " up"),
  "up peer");