flow_dissector: extract more ICMP information
The ICMP flow dissector currently parses only the Type and Code fields. Some ICMP packets (echo, timestamp) have a 16 bit Identifier field which is used to correlate packets. Add such field in flow_dissector_key_icmp and replace skb_flow_get_be16() with a more complex function which populate this field. Signed-off-by:Matteo Croce <mcroce@redhat.com> Signed-off-by:
David S. Miller <davem@davemloft.net>
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