vlan: support QinQ ethernet types

Add support for 802.1AD and 802.1QinQ in ethernet and vlan parsing.

Tickets: #814, #1103, #1104

src/decode-ethernet.c

@@ -76,6 +76,7 @@ int DecodeEthernet(ThreadVars *tv, DecodeThreadVars *dtv, Packet *p,
                                  len - ETHERNET_HEADER_LEN, pq);
             break;
         case ETHERNET_TYPE_VLAN:
+        case ETHERNET_TYPE_8021QINQ:
             DecodeVLAN(tv, dtv, p, pkt + ETHERNET_HEADER_LEN,
                                  len - ETHERNET_HEADER_LEN, pq);
             break;

src/decode-ethernet.h

@@ -36,8 +36,10 @@
 #define ETHERNET_TYPE_IPX             0x8137
 #define ETHERNET_TYPE_PPPOE_DISC      0x8863 /* discovery stage */
 #define ETHERNET_TYPE_PPPOE_SESS      0x8864 /* session stage */
+#define ETHERNET_TYPE_8021AD          0x88a8
 #define ETHERNET_TYPE_8021Q           0x8100
 #define ETHERNET_TYPE_LOOP            0x9000
+#define ETHERNET_TYPE_8021QINQ        0x9100
 
 typedef struct EthernetHdr_ {
     uint8_t eth_dst[6];

src/decode-vlan.c

@@ -105,6 +105,7 @@ int DecodeVLAN(ThreadVars *tv, DecodeThreadVars *dtv, Packet *p, uint8_t *pkt, u
                                  len - VLAN_HEADER_LEN, pq);
             break;
         case ETHERNET_TYPE_VLAN:
+        case ETHERNET_TYPE_8021AD:
             if (p->vlan_idx >= 2) {
                 ENGINE_SET_EVENT(p,VLAN_HEADER_TOO_MANY_LAYERS);
                 return TM_ECODE_OK;