Adding S11 initialization in MME and SPGW as unix sockets.

srsepc/hdr/mme/mme_gtpc.h

@@ -31,6 +31,8 @@
 #include "srslte/common/buffer_pool.h"
 #include "srslte/common/log.h"
 #include "srslte/common/log_filter.h"
+#include <sys/socket.h>
+#include <sys/un.h>
 
 namespace srsepc {
 
@@ -44,13 +46,13 @@ public:
     srslte::gtp_fteid_t mme_ctr_fteid;
     srslte::gtp_fteid_t sgw_ctr_fteid;
   } gtpc_ctx_t;
+
   static mme_gtpc* get_instance(void);
   static void      cleanup(void);
 
   bool init(srslte::log_filter* mme_gtpc_log);
   void handle_s11_pdu(srslte::gtpc_pdu* msg);
 
-  uint32_t     get_new_ctrl_teid();
   virtual bool send_create_session_request(uint64_t imsi);
   bool         handle_create_session_response(srslte::gtpc_pdu* cs_resp_pdu);
   virtual bool send_modify_bearer_request(uint64_t imsi, uint16_t erab_to_modify, srslte::gtp_fteid_t* enb_fteid);
@@ -73,6 +75,12 @@ private:
   uint32_t                            m_next_ctrl_teid;
   std::map<uint32_t, uint64_t>        m_mme_ctr_teid_to_imsi;
   std::map<uint64_t, struct gtpc_ctx> m_imsi_to_gtpc_ctx;
+
+  int                m_s11;
+  struct sockaddr_un m_mme_addr, m_spgw_addr;
+
+  bool     init_s11();
+  uint32_t get_new_ctrl_teid();
 };
 
 inline uint32_t mme_gtpc::get_new_ctrl_teid()

srsepc/hdr/spgw/gtpc.h

@@ -29,6 +29,8 @@
 #include "srsepc/hdr/spgw/spgw.h"
 #include "srslte/asn1/gtpc.h"
 #include "srslte/interfaces/epc_interfaces.h"
+#include <sys/socket.h>
+#include <sys/un.h>
 
 namespace srsepc {
 
@@ -40,13 +42,16 @@ public:
   int  init(spgw_args_t* args, spgw* spgw, gtpu_interface_gtpc* gtpu, srslte::log_filter* gtpc_log);
   void stop();
 
+  srslte::error_t init_s11(spgw_args_t *args);
   srslte::error_t init_ue_ip(spgw_args_t* args);
 
+  int       get_s11();
   uint64_t  get_new_ctrl_teid();
   uint64_t  get_new_user_teid();
   in_addr_t get_new_ue_ipv4();
 
   void handle_s11_pdu(srslte::gtpc_pdu* msg, srslte::gtpc_pdu* reply_msg);
+
   void handle_create_session_request(const srslte::gtpc_create_session_request& cs_req, srslte::gtpc_pdu* gtpc_pdu);
   void handle_modify_bearer_request(const srslte::gtpc_header&                mb_req_hdr,
                                     const srslte::gtpc_modify_bearer_request& mb_req,
@@ -64,6 +69,9 @@ public:
   spgw*                m_spgw;
   gtpu_interface_gtpc* m_gtpu;
 
+  int                m_s11;
+  struct sockaddr_un m_spgw_addr, m_mme_addr;
+
   uint32_t m_h_next_ue_ip;
   uint64_t m_next_ctrl_teid;
   uint64_t m_next_user_teid;
@@ -77,6 +85,11 @@ public:
   srslte::byte_buffer_pool* m_pool;
 };
 
+inline int spgw::gtpc::get_s11()
+{
+  return m_s11;
+}
+
 inline uint64_t spgw::gtpc::get_new_ctrl_teid()
 {
   return m_next_ctrl_teid++;

srsepc/src/mme/mme_gtpc.cc

@@ -73,14 +73,59 @@ bool mme_gtpc::init(srslte::log_filter* mme_gtpc_log)
 
   m_next_ctrl_teid = 1;
 
-  m_s1ap        = s1ap::get_instance();
+  m_s1ap = s1ap::get_instance();
   m_spgw = spgw::get_instance();
 
+  if (!init_s11()) {
+    m_mme_gtpc_log->error("Error Initializing MME S11 Interface\n");
+    return false;
+  }
+
   m_mme_gtpc_log->info("MME GTP-C Initialized\n");
   m_mme_gtpc_log->console("MME GTP-C Initialized\n");
   return true;
 }
 
+bool mme_gtpc::init_s11()
+{
+
+  socklen_t sock_len;
+  char      mme_addr_name[]  = "@mme_s11";
+  char      spgw_addr_name[] = "@spgw_s11";
+
+  // Logs
+  m_mme_gtpc_log->info("Initializing MME S11 interface.\n");
+
+  // Open Socket
+  m_s11 = socket(AF_UNIX, SOCK_DGRAM, 0);
+  if (m_s11 < 0) {
+    m_mme_gtpc_log->error("Error opening UNIX socket. Error %s\n", strerror(errno));
+    return false;
+  }
+
+  // Set MME Address
+  memset(&m_mme_addr, 0, sizeof(struct sockaddr_un));
+  m_mme_addr.sun_family = AF_UNIX;
+  strncpy(m_mme_addr.sun_path, mme_addr_name, strlen(mme_addr_name));
+  m_mme_addr.sun_path[0] = '\0';
+
+  // Bind socket to address
+  if (bind(m_s11, (const struct sockaddr*)&m_mme_addr, sizeof(m_mme_addr)) == -1) {
+    m_mme_gtpc_log->error("Error binding UNIX socket. Error %s\n", strerror(errno));
+    return false;
+  }
+
+  // Set SPGW Address for later use
+  memset(&m_spgw_addr, 0, sizeof(struct sockaddr_un));
+  m_spgw_addr.sun_family = AF_UNIX;
+  strncpy(m_spgw_addr.sun_path, spgw_addr_name, strlen(spgw_addr_name));
+  m_spgw_addr.sun_path[0] = '\0';
+
+  m_mme_gtpc_log->info("MME S11 Initialized\n");
+  m_mme_gtpc_log->console("MME S11 Initialized\n");
+  return true;
+}
+
 void mme_gtpc::handle_s11_pdu(srslte::gtpc_pdu *pdu)
 {
   m_mme_gtpc_log->debug("MME Received GTP-C PDU. Message type %s\n",srslte::gtpc_msg_type_to_str(pdu->header.type));

srsepc/src/spgw/gtpc.cc

@@ -66,6 +66,13 @@ int spgw::gtpc::init(spgw_args_t* args, spgw* spgw, gtpu_interface_gtpc* gtpu, s
   m_spgw = spgw;
   m_gtpu = gtpu;
 
+  // Init S11 interface
+  err = init_s11(args);
+  if (err != srslte::ERROR_NONE) {
+    m_gtpc_log->console("Could not initialize the S11 interface.\n");
+    return -1;
+  }
+
   // Init IP pool
   err = init_ue_ip(args);
   if (err != srslte::ERROR_NONE) {
@@ -90,6 +97,42 @@ void spgw::gtpc::stop()
   return;
 }
 
+srslte::error_t spgw::gtpc::init_s11(spgw_args_t* args)
+{
+  socklen_t sock_len;
+  char      spgw_addr_name[] = "@spgw_s11";
+  char      mme_addr_name[]  = "@mme_s11";
+
+  // Logs
+  m_gtpc_log->info("Initializing SPGW S11 interface.\n");
+
+  // Open Socket
+  m_s11 = socket(AF_UNIX, SOCK_DGRAM, 0);
+  if (m_s11 < 0) {
+    m_gtpc_log->error("Error opening UNIX socket. Error %s\n", strerror(errno));
+    return srslte::ERROR_CANT_START;
+  }
+
+  // Set MME Address
+  memset(&m_mme_addr, 0, sizeof(struct sockaddr_un));
+  m_mme_addr.sun_family = AF_UNIX;
+  strncpy(m_mme_addr.sun_path, mme_addr_name, strlen(mme_addr_name));
+  m_mme_addr.sun_path[0] = '\0';
+
+  // Set SPGW Address
+  memset(&m_spgw_addr, 0, sizeof(struct sockaddr_un));
+  m_spgw_addr.sun_family = AF_UNIX;
+  strncpy(m_spgw_addr.sun_path, spgw_addr_name, strlen(spgw_addr_name));
+  m_spgw_addr.sun_path[0] = '\0';
+
+  // Bind socket to address
+  if (bind(m_s11, (const struct sockaddr*)&m_spgw_addr, sizeof(m_spgw_addr)) == -1) {
+    m_gtpc_log->error("Error binding UNIX socket. Error %s\n", strerror(errno));
+    return srslte::ERROR_CANT_START;
+  }
+  return srslte::ERROR_NONE;
+}
+
 void spgw::gtpc::handle_s11_pdu(srslte::gtpc_pdu* pdu, srslte::gtpc_pdu* reply_pdu)
 {
   m_gtpc_log->console("Received GTP-C PDU. Message type: %s\n", srslte::gtpc_msg_type_to_str(pdu->header.type));