/** * \internal * \brief this function is used to decode IEEE802.1q packets * * \param tv pointer to the thread vars * \param dtv pointer code thread vars * \param p pointer to the packet struct * \param pkt pointer to the raw packet * \param len packet len * \param pq pointer to the packet queue * */ void DecodeVLAN(ThreadVars *tv, DecodeThreadVars *dtv, Packet *p, uint8_t *pkt, uint16_t len, PacketQueue *pq) { SCPerfCounterIncr(dtv->counter_vlan, tv->sc_perf_pca); if(len < VLAN_HEADER_LEN) { DECODER_SET_EVENT(p,VLAN_HEADER_TOO_SMALL); return; } p->vlanh = (VLANHdr *)pkt; if(p->vlanh == NULL) return; SCLogDebug("p %p pkt %p VLAN protocol %04x VLAN PRI %d VLAN CFI %d VLAN ID %d Len: %" PRId32 "", p, pkt, GET_VLAN_PROTO(p->vlanh), GET_VLAN_PRIORITY(p->vlanh), GET_VLAN_CFI(p->vlanh), GET_VLAN_ID(p->vlanh), len); switch (GET_VLAN_PROTO(p->vlanh)) { case ETHERNET_TYPE_IP: DecodeIPV4(tv, dtv, p, pkt + VLAN_HEADER_LEN, len - VLAN_HEADER_LEN, pq); break; case ETHERNET_TYPE_IPV6: DecodeIPV6(tv, dtv, p, pkt + VLAN_HEADER_LEN, len - VLAN_HEADER_LEN, pq); break; case ETHERNET_TYPE_PPPOE_SESS: DecodePPPOESession(tv, dtv, p, pkt + VLAN_HEADER_LEN, len - VLAN_HEADER_LEN, pq); break; case ETHERNET_TYPE_PPPOE_DISC: DecodePPPOEDiscovery(tv, dtv, p, pkt + VLAN_HEADER_LEN, len - VLAN_HEADER_LEN, pq); break; case ETHERNET_TYPE_VLAN: DecodeVLAN(tv, dtv, p, pkt + VLAN_HEADER_LEN, len - VLAN_HEADER_LEN, pq); break; default: SCLogDebug("unknown VLAN type: %" PRIx32 "",GET_VLAN_PROTO(p->vlanh)); DECODER_SET_EVENT(p,VLAN_UNKNOWN_TYPE); return; } return; }
/** * \internal * \brief this function is used to decode IEEE802.1q packets * * \param tv pointer to the thread vars * \param dtv pointer code thread vars * \param p pointer to the packet struct * \param pkt pointer to the raw packet * \param len packet len * \param pq pointer to the packet queue * */ int DecodeVLAN(ThreadVars *tv, DecodeThreadVars *dtv, Packet *p, uint8_t *pkt, uint16_t len, PacketQueue *pq) { uint32_t proto; SCPerfCounterIncr(dtv->counter_vlan, tv->sc_perf_pca); if(len < VLAN_HEADER_LEN) { ENGINE_SET_INVALID_EVENT(p, VLAN_HEADER_TOO_SMALL); return TM_ECODE_FAILED; } if (p->vlan_idx >= 2) { ENGINE_SET_EVENT(p,VLAN_HEADER_TOO_MANY_LAYERS); return TM_ECODE_FAILED; } p->vlanh[p->vlan_idx] = (VLANHdr *)pkt; if(p->vlanh[p->vlan_idx] == NULL) return TM_ECODE_FAILED; proto = GET_VLAN_PROTO(p->vlanh[p->vlan_idx]); SCLogDebug("p %p pkt %p VLAN protocol %04x VLAN PRI %d VLAN CFI %d VLAN ID %d Len: %" PRId32 "", p, pkt, proto, GET_VLAN_PRIORITY(p->vlanh[p->vlan_idx]), GET_VLAN_CFI(p->vlanh[p->vlan_idx]), GET_VLAN_ID(p->vlanh[p->vlan_idx]), len); /* only store the id for flow hashing if it's not disabled. */ if (dtv->vlan_disabled == 0) p->vlan_id[p->vlan_idx] = (uint16_t)GET_VLAN_ID(p->vlanh[p->vlan_idx]); p->vlan_idx++; switch (proto) { case ETHERNET_TYPE_IP: DecodeIPV4(tv, dtv, p, pkt + VLAN_HEADER_LEN, len - VLAN_HEADER_LEN, pq); break; case ETHERNET_TYPE_IPV6: DecodeIPV6(tv, dtv, p, pkt + VLAN_HEADER_LEN, len - VLAN_HEADER_LEN, pq); break; case ETHERNET_TYPE_PPPOE_SESS: DecodePPPOESession(tv, dtv, p, pkt + VLAN_HEADER_LEN, len - VLAN_HEADER_LEN, pq); break; case ETHERNET_TYPE_PPPOE_DISC: DecodePPPOEDiscovery(tv, dtv, p, pkt + VLAN_HEADER_LEN, len - VLAN_HEADER_LEN, pq); break; case ETHERNET_TYPE_VLAN: if (p->vlan_idx >= 2) { ENGINE_SET_EVENT(p,VLAN_HEADER_TOO_MANY_LAYERS); return TM_ECODE_OK; } else { DecodeVLAN(tv, dtv, p, pkt + VLAN_HEADER_LEN, len - VLAN_HEADER_LEN, pq); } break; default: SCLogDebug("unknown VLAN type: %" PRIx32 "", proto); ENGINE_SET_INVALID_EVENT(p, VLAN_UNKNOWN_TYPE); return TM_ECODE_OK; } return TM_ECODE_OK; }