is_loopback6 158 tools/testing/selftests/bpf/progs/test_sock_fields_kern.c !is_loopback6(sk->src_ip6)) is_loopback6 226 tools/testing/selftests/bpf/progs/test_sock_fields_kern.c if (!sk || sk->family != AF_INET6 || !is_loopback6(sk->src_ip6))