From 0a4e256fec4d3378ebf40d8e40f443b4a8c51399 Mon Sep 17 00:00:00 2001
From: Pedro Alvarez <pedro.alvarez@softwareradiosystems.com>
Date: Thu, 7 Dec 2017 19:07:13 +0000
Subject: [PATCH] Stripping GTP-U header at the S-GW and writting it to the TUN
 SGi interface. First over-the-air ping between the SP-GW and the UE.

---
 srsepc/src/spgw/spgw.cc | 13 +++++++++++++
 1 file changed, 13 insertions(+)

diff --git a/srsepc/src/spgw/spgw.cc b/srsepc/src/spgw/spgw.cc
index 02e5dfd18..a69ff04d5 100644
--- a/srsepc/src/spgw/spgw.cc
+++ b/srsepc/src/spgw/spgw.cc
@@ -365,6 +365,19 @@ void
 spgw::handle_s1u_pdu(srslte::byte_buffer_t *msg)
 {
   m_spgw_log->console("Received PDU from S1-U. Bytes=%d\n",msg->N_bytes);
+  srslte::gtpu_header_t header;
+  srslte::gtpu_read_header(msg, &header);
+ 
+  m_spgw_log->console("TEID 0x%x. Bytes=%d\n", header.teid, msg->N_bytes);
+  int n = write(m_sgi_if, msg->msg, msg->N_bytes);
+  if(n<0)
+  {
+    m_spgw_log->error("Could not write to TUN interface.\n",n);
+  }
+  else
+  {
+    m_spgw_log->console("Forwarded packet to TUN interface\n");
+  }
   return;
 }
 uint64_t