ICMP header

The following fields are defined for the ICMP header, as described in []:

$$\begin{tabular}{l\vert cccccccccccccccccccccccccccccccc\vert... ...{2-33} \multicolumn{33}{l}{{\tt icmp\_data}} \\ \end{tabular}$$

All fields listed above are based on icmp_hdr, which in turn is defined as follows:

field icmp_hdr = ip_nexthdr if ip_proto == IPPROTO_ICMP;