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IPv4 and UDP/TCP packets inside of ICMP packet?

        A week ago, after opening wireshark, i was surprised by seing a storm of ICMP packets from different IP addresses. While deep analysing of thoses packets, i noticed that <strong>those ICMP packets contains IPv4 headers and UDP/TCP headers.</strong> It seems like port scanning.
I spent a lot of time searching of an answer of how this is possible but i didnt find anything. I know that there is an attack named ICMP tunneling but i dont think that there is some tunneling in this case. IPv4 & TCP over ICMP Here is some other pictures:

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