mpls: add missing event type + rule

rules/decoder-events.rules

@@ -121,6 +121,7 @@ alert pkthdr any any -> any any (msg:"SURICATA IPv6-in-IPv6 packet too short"; d
 alert pkthdr any any -> any any (msg:"SURICATA IPv6-in-IPv6 invalid protocol"; decode-event:ipv6.ipv6_in_ipv6_wrong_version; sid:2200085; rev:1;)
 
 # MPLS rules
+alert pkthdr any any -> any any (msg:"SURICATA MPLS header too small"; decode-event:mpls.header_too_small; sid:2200111; rev:1;)
 alert pkthdr any any -> any any (msg:"SURICATA MPLS bad router alert label"; decode-event:mpls.bad_label_router_alert; sid: 2200098; rev:1;)
 alert pkthdr any any -> any any (msg:"SURICATA MPLS bad implicit null label"; decode-event:mpls.bad_label_implicit_null; sid: 2200099; rev:1;)
 alert pkthdr any any -> any any (msg:"SURICATA MPLS reserved label"; decode-event:mpls.bad_label_reserved; sid: 2200100; rev:1;)
@@ -140,5 +141,5 @@ alert pkthdr any any -> any any (msg:"SURICATA ERSPAN too many vlan layers"; dec
 # Cisco Fabric Path/DCE
 alert pkthdr any any -> any any (msg:"SURICATA DCE packet too small"; decode-event:dce.pkt_too_small; sid:2200110; rev:1;)
 
-# next sid is 2200111
+# next sid is 2200112
 

src/decode-events.c

@@ -168,6 +168,7 @@ const struct DecodeEvents_ DEvents[] = {
     { "decoder.ipv6.ipv6_in_ipv6_wrong_version", IPV6_IN_IPV6_WRONG_IP_VER, },
 
     /* MPLS events */
+    { "decoder.mpls.header_too_small", MPLS_HEADER_TOO_SMALL, },
     { "decoder.mpls.bad_label_router_alert", MPLS_BAD_LABEL_ROUTER_ALERT, },
     { "decoder.mpls.bad_label_implicit_null", MPLS_BAD_LABEL_IMPLICIT_NULL, },
     { "decoder.mpls.bad_label_reserved", MPLS_BAD_LABEL_RESERVED, },