/* * vxlan.c * * Copyright (C) 2011-22 - ntop.org * * nDPI is free software: you can redistribute it and/or modify * it under the terms of the GNU Lesser General Public License as published by * the Free Software Foundation, either version 3 of the License, or * (at your option) any later version. * * nDPI is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU Lesser General Public License for more details. * * You should have received a copy of the GNU Lesser General Public License * along with nDPI. If not, see . * */ #include "ndpi_protocol_ids.h" #define NDPI_CURRENT_PROTO NDPI_PROTOCOL_VXLAN #include "ndpi_api.h" #include "ndpi_private.h" /* This code handles VXLAN as per RFC 7348 */ static void ndpi_check_vxlan(struct ndpi_detection_module_struct *ndpi_struct, struct ndpi_flow_struct *flow) { struct ndpi_packet_struct *packet = &ndpi_struct->packet; if(packet->payload_packet_len >= sizeof(struct ndpi_vxlanhdr)) { /* *rfc-7348 vxlan header +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |R|R|R|R|I|R|R|R| Reserved | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | VXLAN Network Identifier (VNI) | Reserved | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ */ u_int32_t vxlan_dst_port = ntohs(4789); struct ndpi_vxlanhdr *vxlanhdr = (struct ndpi_vxlanhdr *)packet->payload; if((packet->udp->dest == vxlan_dst_port) && (vxlanhdr->flags == ntohs(0x0800)) && (vxlanhdr->groupPolicy == 0x0) && (vxlanhdr->reserved == 0x0)) { NDPI_LOG_INFO(ndpi_struct, "found vxlan\n"); ndpi_set_detected_protocol(ndpi_struct, flow, NDPI_PROTOCOL_VXLAN, NDPI_PROTOCOL_VXLAN, NDPI_CONFIDENCE_DPI); return; } } NDPI_EXCLUDE_PROTO(ndpi_struct, flow); return; } static void ndpi_search_vxlan(struct ndpi_detection_module_struct *ndpi_struct, struct ndpi_flow_struct *flow) { NDPI_LOG_DBG(ndpi_struct, "search vxlan\n"); ndpi_check_vxlan(ndpi_struct, flow); } void init_vxlan_dissector(struct ndpi_detection_module_struct *ndpi_struct, u_int32_t *id) { ndpi_set_bitmask_protocol_detection("VXLAN", ndpi_struct, *id, NDPI_PROTOCOL_VXLAN, ndpi_search_vxlan, NDPI_SELECTION_BITMASK_PROTOCOL_V4_V6_UDP_WITH_PAYLOAD, SAVE_DETECTION_BITMASK_AS_UNKNOWN, ADD_TO_DETECTION_BITMASK); *id += 1; }