udp protocol insert client source ip

If you are not using SNAT/NAT, you should be able to see the source IP. Assuming that you do have SNAT/NAT, I don't think is possible.

We can do with HTTP, because we can use custom headers. However, I don't think there is any mechanism to do that with TCP or UDP. UDP does not have any extra field, TCP does have an option field but does not look like you can use this for source ip information.