Add PFCP protocol dissector (#2342)

1 files changed, 72 insertions, 0 deletions

diff --git a/src/lib/protocols/pfcp.c b/src/lib/protocols/pfcp.c
new file mode 100644
index 000000000..636b403bd
--- /dev/null
+++ b/src/lib/protocols/pfcp.c
@@ -0,0 +1,72 @@
+/*
+ * pfcp.c
+ *
+ * Packet Forwarding Control Protocol
+ * 
+ * Copyright (C) 2024 - ntop.org
+ * Copyright (C) 2024 - V.G <jacendi@protonmail.com>
+ *
+ * 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"
+
+#define NDPI_CURRENT_PROTO NDPI_PROTOCOL_PFCP
+
+#include "ndpi_api.h"
+#include "ndpi_private.h"
+
+static void ndpi_search_pfcp(struct ndpi_detection_module_struct *ndpi_struct,
+                             struct ndpi_flow_struct *flow)
+{
+  struct ndpi_packet_struct const * const packet = &ndpi_struct->packet;
+
+  NDPI_LOG_DBG(ndpi_struct, "search PFCP\n");
+
+  if (packet->payload_packet_len > 12 &&
+      (ntohs(packet->udp->dest) == 8805 || ntohs(packet->udp->source) == 8805))
+  {
+    u_int8_t version = packet->payload[0] & 0x0F;
+    /* Values from 18 to 49, 58 to 99 and 100 to 255 are reserved for future use 
+     * and aren't used now. */
+    u_int8_t message_type = packet->payload[1];
+    if (version == 1 && (message_type <= 17 || (message_type - 50) <= 7) &&
+        ntohs(get_u_int16_t(packet->payload, 2)) == (u_int16_t)(packet->payload_packet_len-4))
+    {
+      NDPI_LOG_INFO(ndpi_struct, "found PFCP\n");
+      ndpi_set_detected_protocol(ndpi_struct, flow,
+                                 NDPI_PROTOCOL_PFCP, NDPI_PROTOCOL_UNKNOWN,
+                                 NDPI_CONFIDENCE_DPI);
+      return;
+    }
+  }
+
+  NDPI_EXCLUDE_PROTO(ndpi_struct, flow);
+}
+void init_pfcp_dissector(struct ndpi_detection_module_struct *ndpi_struct,
+                             u_int32_t *id)
+{
+  ndpi_set_bitmask_protocol_detection("PFCP", ndpi_struct, *id,
+                                      NDPI_PROTOCOL_PFCP,
+                                      ndpi_search_pfcp,
+                                      NDPI_SELECTION_BITMASK_PROTOCOL_V4_V6_UDP_WITH_PAYLOAD,
+                                      SAVE_DETECTION_BITMASK_AS_UNKNOWN,
+                                      ADD_TO_DETECTION_BITMASK);
+
+  *id += 1;
+}