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/*
* diameter.c
*
* Copyright (C) 2018 - ntop.org
* Written by Michele Campus - <campus@ntop.org>
*
* This file is part of nDPI, an open source deep packet inspection
* library based on the OpenDPI and PACE technology by ipoque GmbH
*
* 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 <http://www.gnu.org/licenses/>.
*
*/
#include "ndpi_protocol_ids.h"
#ifdef NDPI_PROTOCOL_DIAMETER
#define NDPI_CURRENT_PROTO NDPI_PROTOCOL_DIAMETER
#include "ndpi_api.h"
// Header Flags possibile values
#define DIAMETER_REQUEST 0X80
#define DIAMETER_PROXYABLE 0X40
#define DIAMETER_ERROR 0X20
#define DIAMETER_RETRASM 0X10
typedef enum {
AC = 271,
AS = 274,
CC = 272,
CE = 257,
DW = 280,
DP = 282,
RA = 258,
ST = 275
} com_type_t;
#define DIAM_HEADER_LEN 20
// DIAMETER header
struct diameter_header_t
{
u_int8_t version;
u_int8_t length[3];
u_int8_t flags;
u_int8_t com_code[3];
u_int32_t app_id;
u_int32_t hop_id;
u_int32_t end_id;
};
// Check packet
int is_diameter(struct ndpi_packet_struct *packet, int size_payload)
{
// check param
if(!packet || size_payload == 0) return -1;
// cast to diameter header
struct diameter_header_t *diameter = (struct diameter_header_t *) packet;
// check if the packet is diameter
if(diameter->version == 0x01 &&
(diameter->flags == DIAMETER_REQUEST ||
diameter->flags == DIAMETER_PROXYABLE ||
diameter->flags == DIAMETER_ERROR ||
diameter->flags == DIAMETER_RETRASM)) {
u_int16_t com_code = diameter->com_code[2] + (diameter->com_code[1] << 8) + (diameter->com_code[0] << 8);
if(com_code == AC || com_code == AS ||
com_code == CC || com_code == CE ||
com_code == DW || com_code == DP ||
com_code == RA || com_code == ST)
return 0; // OK
}
// wrong packet
return -2;
}
void ndpi_search_diameter(struct ndpi_detection_module_struct *ndpi_struct,
struct ndpi_flow_struct *flow)
{
struct ndpi_packet_struct *packet = &flow->packet;
// Diameter is on TCP
if(packet->tcp) {
/* Check if it's diameter */
int ret = is_diameter(packet, packet->payload_packet_len);
if(ret != 0) {
NDPI_EXCLUDE_PROTO(ndpi_struct, flow);
return;
}
else {
NDPI_LOG_INFO(ndpi_struct, "found Diameter\n");
ndpi_set_detected_protocol(ndpi_struct, flow, NDPI_PROTOCOL_DIAMETER, NDPI_PROTOCOL_UNKNOWN);
}
}
else { // UDP
NDPI_EXCLUDE_PROTO(ndpi_struct, flow);
return;
}
}
void init_diameter_dissector(struct ndpi_detection_module_struct *ndpi_struct, u_int32_t *id,
NDPI_PROTOCOL_BITMASK *detection_bitmask)
{
ndpi_set_bitmask_protocol_detection("Diameter", ndpi_struct, detection_bitmask, *id,
NDPI_PROTOCOL_DIAMETER, ndpi_search_diameter,
NDPI_SELECTION_BITMASK_PROTOCOL_V4_V6_UDP_WITH_PAYLOAD,
SAVE_DETECTION_BITMASK_AS_UNKNOWN, ADD_TO_DETECTION_BITMASK);
*id += 1;
}
#endif /* NDPI_PROTOCOL_DIAMETER */
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