Added initial mechanisms to receive msgs from eNB.

srsepc/hdr/mme/mme.h

@@ -34,22 +34,34 @@
 #define MME_H
 
 #include <cstddef>
+#include "s1ap.h"
+
 
 namespace srsepc{
 
+typedef struct{
+  s1ap_args_t s1ap_args;
+} all_args_t;
+
+
 class mme
 {
 public:
   static mme* get_instance(void);
 
   static void cleanup(void);
+  
+  int init(all_args_t* args);
+
+  int get_s1_mme();
 
 private:
 
-  static mme *instance;
   mme();
   virtual ~mme();
-
+  static mme *m_instance;
+  s1ap m_s1ap;
+ 
 };
 
 } // namespace srsepc

srsepc/hdr/mme/s1ap.h

@@ -26,12 +26,39 @@
 
 namespace srsepc{
 
+const uint16_t S1MME_PORT = 36412;
+
+typedef struct{
+  uint8_t       mme_code;
+  uint16_t      mme_group;
+  uint16_t      tac;        // 16-bit tac
+  uint16_t      mcc;        // BCD-coded with 0xF filler
+  uint16_t      mnc;        // BCD-coded with 0xF filler
+  std::string   mme_bindx_addr;
+  std::string   mme_name;
+} s1ap_args_t;
+
 class s1ap
 {
 public:
   s1ap();
   virtual ~s1ap();
   int enb_listen();
+  
+  int init(s1ap_args_t s1ap_args);
+
+  int get_s1_mme();
+
+private:
+  uint8_t       m_mme_code;
+  uint16_t      m_mme_group;
+  uint16_t      m_tac;        // 16-bit tac
+  uint16_t      m_mcc;        // BCD-coded with 0xF filler
+  uint16_t      m_mnc;        // BCD-coded with 0xF filler
+  std::string   m_mme_bindx_addr;
+  std::string   m_mme_name;
+
+  int m_s1mme;
 };
 
 } //namespace srsepc

srsepc/src/main.cc

@@ -8,12 +8,12 @@
  *
  * This file is part of srsLTE.
  *
- * srsUE is free software: you can redistribute it and/or modify
+ * srsLTE is free software: you can redistribute it and/or modify
  * it under the terms of the GNU Affero General Public License as
  * published by the Free Software Foundation, either version 3 of
  * the License, or (at your option) any later version.
  *
- * srsUE is distributed in the hope that it will be useful,
+ * srsLTE 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 Affero General Public License for more details.
@@ -24,20 +24,103 @@
  *
  */
 #include <iostream>
+#include <arpa/inet.h>
+#include <sys/types.h>
+#include <sys/socket.h>
+#include <netinet/sctp.h>
 #include <boost/program_options.hpp>
 #include "mme/mme.h"
 
-
 using namespace std;
 using namespace srsepc;
 namespace bpo = boost::program_options;
 
+bool running = true;
+
+/*
+void
+parse_args(all_args_t *args, int argc, char* argv[]) {
+
+  string mme_code;
+  string mme_group;
+  string tac;
+  string mcc;
+  string mnc;
+
+  // Command line only options
+  bpo::options_description general("General options");
+  general.add_options()
+      ("help,h", "Produce help message")
+      ("version,v", "Print version information and exit")
+      ;
+
+  // Command line or config file options
+  bpo::options_description common("Configuration options");
+  common.add_options()
+
+    ("mme.enb_id",        bpo::value<string>(&enb_id)->default_value("0x0"),                       "eNodeB ID")
+    ("mme.name",          bpo::value<string>(&args->enb.s1ap.enb_name)->default_value("srsenb01"), "eNodeB Name")
+    ("mme.cell_id",       bpo::value<string>(&cell_id)->default_value("0x0"),                      "Cell ID")
+    ("mme.tac",           bpo::value<string>(&tac)->default_value("0x0"),                          "Tracking Area Code")
+    ("mme.mcc",           bpo::value<string>(&mcc)->default_value("001"),                          "Mobile Country Code")
+    ("mme.mnc",           bpo::value<string>(&mnc)->default_value("01"),                           "Mobile Network Code")
+    ("mme.mme_bindx_addr",      bpo::value<string>(&args->enb.s1ap.mme_addr)->default_value("127.0.0.1"),"IP address of MME for S1 connnection")
+    ;
+
+  // Positional options - config file location
+  bpo::options_description position("Positional options");
+  position.add_options()
+  ("config_file", bpo::value< string >(&config_file), "eNodeB configuration file")
+  ;
+  bpo::positional_options_description p;
+  p.add("config_file", -1)
+
+  return;
+}
+*/
+
 int
 main (int argc,char * argv[] )
-{
-  //signal(SIGINT,    sig_int_handler);
-  mme              *mme = mme::get_instance();
-
+{  
   cout << "---  Software Radio Systems EPC MME  ---" << endl << endl;
+  
+  //signal(SIGINT,    sig_int_handler);
+
+  //TODO these should be passed from config files
+  all_args_t args; 
+  args.s1ap_args.mme_code = 0x01;
+  args.s1ap_args.mme_group = 0x0001;
+  args.s1ap_args.tac = 0x0001;
+  args.s1ap_args.mcc = 0x01;
+  args.s1ap_args.mnc = 0x01;
+  args.s1ap_args.mme_bindx_addr="127.0.0.0/24";
+
+  struct sockaddr_in enb_addr;
+  char readbuf[1000];
+  struct sctp_sndrcvinfo sri;
+  socklen_t fromlen;
+  int rd_sz;
+  int msg_flags;
+
+  mme *mme = mme::get_instance();
+  if (mme->init(&args)) {
+    cout << "Error initializing MME" << endl;
+    exit(1);
+  }
+
+  //Initalize S1-MME scoket
+  int s1mme = mme->get_s1_mme();
+  while(running)
+  {
+    cout << "Waiting for SCTP Msg" << endl;
+    rd_sz = sctp_recvmsg(s1mme, (void*) readbuf, sizeof(readbuf),(struct sockaddr*) &enb_addr, &fromlen, &sri, &msg_flags);
+    if (rd_sz == -1){
+      cout<< "Error reading from SCTP socket"<<endl;
+    }
+    cout << "Received SCTP msg." << endl;
+    cout << "\tSize: " << rd_sz <<endl;
+    cout << "\tMsg: " << readbuf << endl;
+  }
+    
   return 0;
 }

srsepc/src/mme/mme.cc

@@ -24,12 +24,13 @@
  *
  */
 
+#include <iostream> //TODO Remove
 #include <boost/thread/mutex.hpp>
 #include "mme/mme.h"
 
 namespace srsepc{
 
-mme*          mme::instance = NULL;
+mme*          mme::m_instance = NULL;
 boost::mutex  mme_instance_mutex;
 
 mme::mme()
@@ -46,21 +47,36 @@ mme*
 mme::get_instance(void)
 {
   boost::mutex::scoped_lock lock(mme_instance_mutex);
-  if(NULL == instance) {
-    instance = new mme();
+  if(NULL == m_instance) {
+    m_instance = new mme();
   }
-  return(instance);
+  return(m_instance);
 }
 
 void
 mme::cleanup(void)
 {
   boost::mutex::scoped_lock lock(mme_instance_mutex);
-  if(NULL != instance) {
-    delete instance;
-    instance = NULL;
+  if(NULL != m_instance) {
+    delete m_instance;
+    m_instance = NULL;
   }
 }
 
+int
+mme::init(all_args_t* args)
+{
+  if(m_s1ap.init(args->s1ap_args)){
+    std::cout << "Error initializing MME S1APP" << std::endl;
+    exit(-1);
+  }
+  return 0;
+}
+
+int
+mme::get_s1_mme()
+{
+  return m_s1ap.get_s1_mme();
+}
 
 } //namespace srsepc

srsepc/src/mme/s1ap.cc

@@ -43,11 +43,26 @@ s1ap::~s1ap()
 {
 }
 
+int
+s1ap::init(s1ap_args_t s1ap_args)
+{
+  m_mme_code    = s1ap_args.mme_code ;
+  m_mme_group   = s1ap_args.mme_group;
+  m_tac         = s1ap_args.tac;
+  m_mcc         = s1ap_args.mcc;        
+  m_mnc         = s1ap_args.mnc;        
+  m_mme_bindx_addr = s1ap_args.mme_bindx_addr;
+  m_mme_name = std::string("SRS MME");
+
+  m_s1mme = enb_listen();
+  return 0;
+}
+
 int
 s1ap::enb_listen()
 {
   /*This function sets up the SCTP socket for eNBs to connect to*/
-  int sock_fd;
+  int sock_fd, err;
   struct sockaddr_in s1mme_addr;//TODO make this a configurable class memeber.
 
   sock_fd = socket (AF_INET, SOCK_SEQPACKET, IPPROTO_SCTP);
@@ -59,13 +74,26 @@ s1ap::enb_listen()
   //S1-MME bind
   bzero(&s1mme_addr, sizeof(s1mme_addr));
   s1mme_addr.sin_family = AF_INET;
-  s1mme_addr.sin_addr.s_addr = htonl(INADDR_ANY);
-  s1mme_addr.sin_port = htons(18000); //TODO define S1MME_PORT
+  s1mme_addr.sin_addr.s_addr = htonl(INADDR_ANY); //TODO this should use the bindx information
+  s1mme_addr.sin_port = htons(S1MME_PORT);
+  err = bind(sock_fd, (struct sockaddr*) &s1mme_addr, sizeof (s1mme_addr));
+  if (err != 0){
+    std::cout << "Error binding SCTP socket" << std::endl;
+  }
 
   //Listen for connections
-  listen(sock_fd,SOMAXCONN);
+  err = listen(sock_fd,SOMAXCONN);
+  if (err != 0){
+    std::cout << "Error in SCTP socket listen" << std::endl;
+  }
 
   return sock_fd;
 }
 
+int
+s1ap::get_s1_mme()
+{
+  return m_s1mme;
+}
+
 }//namespace srsepc