sk_buff (h and hn question)

[ml@xxxxxxxxxxxxx]

Consider a netfilter hook with NF_IP_PRI_FIRST, when I am looking the packet 
under my hook function n and hn always refer to the ip header event if its an 
icmp packet. For the nh I understand because its the network layer header but 
when using ICMP, why the transport layer header is pointing to an ip header 
and not an icmp header (i mean why ipiph is valid and not icmph)?
TIA


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