Symbol: IP4_TUN_FWD
tools/testing/selftests/bpf/prog_tests/tc_redirect.c
1228
SYS(fail, "ip -netns " NS_FWD " addr add dev tun_fwd " IP4_TUN_FWD "/24");
tools/testing/selftests/bpf/prog_tests/tc_redirect.c
1234
SYS(fail, "ip -netns " NS_SRC " route add " IP4_DST "/32 via " IP4_TUN_FWD