mirror of
https://github.com/vel21ripn/nDPI.git
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85 lines
2.7 KiB
C
85 lines
2.7 KiB
C
/*
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* gtp.c
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*
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* Copyright (C) 2011-15 - ntop.org
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*
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* nDPI is free software: you can redistribute it and/or modify
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* it under the terms of the GNU Lesser General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* nDPI is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public License
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* along with nDPI. If not, see <http://www.gnu.org/licenses/>.
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*
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*/
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#include "ndpi_api.h"
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#ifdef NDPI_PROTOCOL_GTP
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struct gtp_header_generic {
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u_int8_t flags, message_type;
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u_int16_t message_len;
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u_int32_t teid;
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};
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static void ndpi_check_gtp(struct ndpi_detection_module_struct *ndpi_struct, struct ndpi_flow_struct *flow)
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{
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struct ndpi_packet_struct *packet = &flow->packet;
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// const u_int8_t *packet_payload = packet->payload;
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u_int32_t payload_len = packet->payload_packet_len;
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#if 0
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printf("[len=%u][%02X %02X %02X %02X]\n", payload_len,
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packet->payload[0] & 0xFF,
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packet->payload[1] & 0xFF,
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packet->payload[2] & 0xFF,
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packet->payload[3] & 0xFF);
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#endif
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if((packet->udp != NULL) && (payload_len > sizeof(struct gtp_header_generic))) {
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u_int32_t gtp_u = ntohs(2152);
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u_int32_t gtp_c = ntohs(2123);
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u_int32_t gtp_v0 = ntohs(3386);
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if((packet->udp->source == gtp_u) || (packet->udp->dest == gtp_u)
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|| (packet->udp->source == gtp_c) || (packet->udp->dest == gtp_c)
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|| (packet->udp->source == gtp_v0) || (packet->udp->dest == gtp_v0)
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) {
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struct gtp_header_generic *gtp = (struct gtp_header_generic*)packet->payload;
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u_int8_t gtp_version = (gtp->flags & 0xE0) >> 5;
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if((gtp_version == 0) || (gtp_version == 1) || (gtp_version == 2)) {
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u_int16_t message_len = ntohs(gtp->message_len);
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if(message_len <= (payload_len-sizeof(struct gtp_header_generic))) {
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NDPI_LOG(NDPI_PROTOCOL_GTP, ndpi_struct, NDPI_LOG_DEBUG, "Found gtp.\n");
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ndpi_int_add_connection(ndpi_struct, flow, NDPI_PROTOCOL_GTP, NDPI_REAL_PROTOCOL);
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return;
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}
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}
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}
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}
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NDPI_ADD_PROTOCOL_TO_BITMASK(flow->excluded_protocol_bitmask, NDPI_PROTOCOL_GTP);
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return;
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}
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void ndpi_search_gtp(struct ndpi_detection_module_struct *ndpi_struct, struct ndpi_flow_struct *flow)
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{
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struct ndpi_packet_struct *packet = &flow->packet;
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NDPI_LOG(NDPI_PROTOCOL_GTP, ndpi_struct, NDPI_LOG_DEBUG, "gtp detection...\n");
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/* skip marked packets */
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if(packet->detected_protocol_stack[0] != NDPI_PROTOCOL_GTP)
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ndpi_check_gtp(ndpi_struct, flow);
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}
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#endif
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