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/*
* quic.c
*
* Copyright (C) 2015 - Andrea Buscarinu <andrea.buscarinu@gmail.com>
* Copyright (C) 2015 - Michele Campus <fci1908@gmail.com>
* Copyright (C) 2012-15 - ntop.org
*
* This module 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.
*
* This module 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.
* If not, see <http://www.gnu.org/licenses/>.
*
*/
#include "ndpi_api.h"
#define SEQ_CID_MASK_ALL 0x3c // 0011 1100
#define QUIC_VER_MASK 0x01 // 0000 0001
#define CID_LEN_8 0x0C // 0000 1100
#define CID_LEN_4 0x08 // 0000 1000
#define CID_LEN_1 0x04 // 0000 0100
#define CID_LEN_0 0x00 // 0000 0000
#define CID_MASK 0x0C // 0000 1100
#ifdef NDPI_PROTOCOL_QUIC
static void ndpi_int_quic_add_connection(struct ndpi_detection_module_struct
*ndpi_struct, struct ndpi_flow_struct *flow)
{
ndpi_int_add_connection(ndpi_struct, flow, NDPI_PROTOCOL_QUIC, NDPI_REAL_PROTOCOL);
}
void ndpi_search_quic(struct ndpi_detection_module_struct *ndpi_struct, struct ndpi_flow_struct *flow)
{
struct ndpi_packet_struct *packet = &flow->packet;
u_int16_t dport = 0, sport = 0;
u_int ver_offset;
u_int cid_len;
if(packet->udp != NULL) {
sport = ntohs(packet->udp->source), dport = ntohs(packet->udp->dest);
NDPI_LOG(NDPI_PROTOCOL_QUIC, ndpi_struct, NDPI_LOG_DEBUG, "calculating quic over udp.\n");
// Settings without version. First check if PUBLIC FLAGS & SEQ bytes are 0x0. SEQ must be 1 at least.
if ((sport == 443 || dport == 443) && (((packet->payload[0] == 0x00 && packet->payload[1] != 0x00) ||
(packet->payload[0] == 0x10) || (packet->payload[0] == 0x0c) ||
(packet->payload[0] == 0x1c)) || (packet->payload[0] & SEQ_CID_MASK_ALL)))
{
NDPI_LOG(NDPI_PROTOCOL_QUIC, ndpi_struct, NDPI_LOG_DEBUG, "found quic.\n");
ndpi_int_quic_add_connection(ndpi_struct, flow);
// Check if version, than the CID length.
} else if (packet->payload[0] & QUIC_VER_MASK)
{
// Has version, check CID length.
switch (packet->payload[0] & CID_MASK)
{
case CID_LEN_8: cid_len = 8; break;
case CID_LEN_4: cid_len = 4; break;
case CID_LEN_1: cid_len = 1; break;
case CID_LEN_0: cid_len = 0; break;
default:
NDPI_LOG(NDPI_PROTOCOL_QUIC, ndpi_struct, NDPI_LOG_DEBUG, "exclude quic.\n");
NDPI_ADD_PROTOCOL_TO_BITMASK(flow->excluded_protocol_bitmask, NDPI_PROTOCOL_QUIC);
}
// Version offset.
ver_offset = 1 + cid_len;
unsigned char vers[] = { packet->payload[ver_offset + 1], packet->payload[ver_offset + 2],
packet->payload[ver_offset + 3], packet->payload[ver_offset + 4]};
// Check version match.
if (vers[0] == 'Q' && vers[1] == '0' &&
(vers[2] == '2' && (vers[3] == '5' || vers[3] == '4' || vers[3] == '3' || vers[3] == '2' ||
vers[3] == '1' || vers[3] == '0')) ||
(vers[2] == '1' && (vers[3] == '9' || vers[3] == '8' || vers[3] == '7' || vers[3] == '6' ||
vers[3] == '5' || vers[3] == '4' || vers[3] == '3' || vers[3] == '2' ||
vers[3] == '1' || vers[3] == '0')) ||
(vers[2] == '0' && vers[3] == '9'))
{
NDPI_LOG(NDPI_PROTOCOL_QUIC, ndpi_struct, NDPI_LOG_DEBUG, "found quic.\n");
ndpi_int_quic_add_connection(ndpi_struct, flow);
}
} else
{
NDPI_LOG(NDPI_PROTOCOL_QUIC, ndpi_struct, NDPI_LOG_DEBUG, "exclude quic.\n");
NDPI_ADD_PROTOCOL_TO_BITMASK(flow->excluded_protocol_bitmask, NDPI_PROTOCOL_QUIC);
}
}
}
#endif
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