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suricata/doc/userguide/rules/decode-layer.rst

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Generic Decode Layer Keywords
=============================
decode-event
------------
Match on events generated by the decode layer. Decode events are generated during
the packet decoding phase that indicate structural or invalid values for the
Ethernet and layer 2 and layer 3 protocol data.
Syntax::
decode-event:<event name>;
Examples::
decode-event:ipv4.opt_duplicate
decode-event:ethernet.unknown_ethertype
Decode Events
~~~~~~~~~~~~~
ethernet.unknown_ethertype
^^^^^^^^^^^^^^^^^^^^^^^^^^
The ethertype value was not recognized by Suricata. Suricata recognizes
the following ethertype values::
ETHERNET_TYPE_IP
ETHERNET_TYPE_IPV6
ETHERNET_TYPE_VLAN
ETHERNET_TYPE_8021QINQ
ETHERNET_TYPE_8021AD
ETHERNET_TYPE_8021AH
ETHERNET_TYPE_ARP
ETHERNET_TYPE_MPLS_UNICAST
ETHERNET_TYPE_MPLS_MULTICAST
ETHERNET_TYPE_DCE
ETHERNET_TYPE_VNTAG
ETHERNET_TYPE_NSH
ETHERNET_TYPE_PPOE_SESS
ETHERNET_TYPE_PPOE_DISC