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srsLTE
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Continuing to work on initial context setup request.

This commit is contained in:
Pedro Alvarez 2017-11-27 19:13:34 +00:00
parent fd6baaf15c
commit 6cd055e80e
6 changed files with 72 additions and 31 deletions
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4
lib/include/srslte/asn1/gtpc.h
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@ -27,6 +27,10 @@
#include <stdint.h>
#include "srslte/asn1/gtpc_msg.h"
//Helpful marcos to convert TEIDs (uint64_t) to/from network byte order
#define HTONLL(x) ((1==htonl(1)) ? (x) : (((uint64_t)htonl((x) & 0xFFFFFFFFUL)) << 32) | htonl((uint32_t)((x) >> 32)))
#define NTOHLL(x) ((1==ntohl(1)) ? (x) : (((uint64_t)ntohl((x) & 0xFFFFFFFFUL)) << 32) | ntohl((uint32_t)((x) >> 32)))
namespace srslte{
/*GTP-C Version*/

2
lib/include/srslte/asn1/gtpc_msg.h
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@ -202,7 +202,7 @@ struct gtpc_create_session_request
struct gtpc_f_teid_ie s12_rnc_f_teid;
bool s2b_u_epdg_f_teid_present;
struct gtpc_f_teid_ie s2b_u_epdg_f_teid;
} bearer_context_created; // M
} eps_bearer_context_created; // M
//bool bearer_context_deleted_present;
//struct bearer_context_ bearer_context_deleted; // C
//bool trace_information_present;

2
srsepc/hdr/mme/mme_gtpc.h
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@ -46,7 +46,7 @@ public:
void init();
uint64_t get_new_ctrl_teid();
void send_create_session_request(uint64_t imsi, struct srslte::gtpc_pdu *cs_resp_pdu);
void send_create_session_request(uint64_t imsi, uint32_t mme_s1ap_id);
void handle_create_session_response(srslte::gtpc_pdu *cs_resp_pdu);
private:

2
srsepc/hdr/mme/s1ap.h
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@ -81,7 +81,7 @@ public:
bool handle_nas_authentication_response(srslte::byte_buffer_t *nas_buffer, srslte::byte_buffer_t *reply_buffer, ue_ctx_t *ue_ctx);
bool handle_nas_security_mode_complete(srslte::byte_buffer_t *nas_msg, srslte::byte_buffer_t *reply_msg, ue_ctx_t *ue_ctx);
bool send_initial_context_setup_request(struct srslte::gtpc_create_session_response *cs_resp);
bool send_initial_context_setup_request(uint32_t mme_ue_s1ap_id, struct srslte::gtpc_create_session_response *cs_resp);
void print_enb_ctx_info(const enb_ctx_t &enb_ctx);

36
srsepc/src/mme/mme_gtpc.cc
View File

@ -79,11 +79,14 @@ mme_gtpc::get_new_ctrl_teid()
return m_next_ctrl_teid++; //FIXME Use a Id pool?
}
void
mme_gtpc::send_create_session_request(uint64_t imsi, struct srslte::gtpc_pdu *cs_resp_pdu)
mme_gtpc::send_create_session_request(uint64_t imsi, uint32_t mme_ue_s1ap_id)
{
struct srslte::gtpc_pdu cs_req_pdu;
struct srslte::gtpc_create_session_request *cs_req = &cs_req_pdu.choice.create_session_request;
struct srslte::gtpc_pdu cs_resp_pdu;
//Initialize GTP-C message to zero
bzero(&cs_req_pdu, sizeof(struct srslte::gtpc_pdu));
@ -95,7 +98,7 @@ mme_gtpc::send_create_session_request(uint64_t imsi, struct srslte::gtpc_pdu *cs
//Setup GTP-C Create Session Request IEs
// Control TEID allocated \\
cs_req->sender_f_teid.tied = get_new_ctrl_teid();
cs_req->sender_f_teid.teid = get_new_ctrl_teid();
cs_req->sender_f_teid.ipv4 = m_mme_gtpc_ip;
// APN \\
memcpy(cs_req->apn, "internet", sizeof("internet"));
@ -103,20 +106,39 @@ mme_gtpc::send_create_session_request(uint64_t imsi, struct srslte::gtpc_pdu *cs
cs_req->rat_type = GTPC_RAT_TYPE::EUTRAN;
//Save RX Control TEID
//create_rx_control_teid(cs_req->sender_f_teid);
m_teid_to_mme_s1ap_id.insert(std::pair<uint64_t,uint32_t>(cs_req->sender_f_teid.teid, mme_ue_s1ap_id));
m_spgw->handle_create_session_request(cs_req, cs_resp_pdu);
return;
m_spgw->handle_create_session_request(cs_req, &cs_resp_pdu);
handle_create_session_response(&cs_resp_pdu);
}
void
mme_gtpc::handle_create_session_response(srslte::gtpc_pdu *cs_resp_pdu)
{
struct srslte::gtpc_create_session_response *cs_resp = & cs_resp_pdu->choice.create_session_response;
if (cs_resp_pdu->header.type != srslte::GTPC_MSG_TYPE_CREATE_SESSION_RESPONSE)
{
//m_mme_gtpc_log->warning("Could not create GTPC session.\n");
//TODO Handle err
return;
}
if (cs_resp->cause.cause_value != srslte::GTPC_CAUSE_VALUE_REQUEST_ACCEPTED){
//m_mme_gtpc_log->warning("Could not create GTPC session.\n");
//TODO Handle error
return;
}
//Get MME_UE_S1AP_ID from the Ctrl TEID
std::map<uint64_t,uint32_t>::iterator id_it = m_teid_to_mme_s1ap_id.find(cs_resp_pdu->header.teid);
if(id_it == m_teid_to_mme_s1ap_id.end())
{
//Could not find MME UE S1AP TEID
return;
}
uint32_t mme_s1ap_id = id_it->second;
m_s1ap->send_intial_context_setup_request(mme_s1ap_id, &cs_resp_pdu->choice.create_session_request);
m_s1ap->send_initial_context_setup_request(mme_s1ap_id, cs_resp);
}
} //namespace srsepc

57
srsepc/src/mme/s1ap.cc
View File

@ -50,7 +50,7 @@ s1ap::get_instance(void)
{
boost::mutex::scoped_lock lock(s1ap_instance_mutex);
if(NULL == m_instance) {
m_instance = new mme();
m_instance = new s1ap();
}
return(m_instance);
}
@ -538,37 +538,41 @@ s1ap::handle_nas_security_mode_complete(srslte::byte_buffer_t *nas_msg, srslte::
//FIXME The packging of GTP-C messages is not ready.
//This means that GTP-U tunnels are created with function calls, as opposed to GTP-C.
struct srslte::gtpc_pdu cs_resp_pdu;
struct srslte::gtpc_create_session_response *cs_resp = & cs_resp_pdu.choice.create_session_response;
m_mme_gtpc->send_create_session_request(ue_ctx->imsi, ue_ctx->mme_ue_s1ap_id);
m_mme_gtpc->send_create_session_request(ue_ctx->imsi, &cs_resp_pdu);
if (cs_resp->cause.cause_value != srslte::GTPC_CAUSE_VALUE_REQUEST_ACCEPTED){
m_s1ap_log->warning("Could not create GTPC session.\n");
//TODO Handle error
}
else{
send_initial_context_setup_request(cs_resp);
}
return true;
}
bool
s1ap::send_initial_context_setup_request(struct srslte::gtpc_create_session_response *cs_resp)
s1ap::send_initial_context_setup_request(uint32_t mme_ue_s1ap_id, struct srslte::gtpc_create_session_response *cs_resp)
{
//Find UE Context
ue_ctx_t *ue_ctx;
std::map<uint32_t, ue_ctx_t*>::iterator ue_ctx_it = m_active_ues.find(mme_ue_s1ap_id);
if(ue_ctx_it == m_active_ues.end())
{
m_s1ap_log->error("Could not find UE to send Setup Context Request. MME S1AP Id: %d", mme_ue_s1ap_id);
return false;
}
ue_ctx = ue_ctx_it->second;
LIBLTE_S1AP_MESSAGE_INITIALCONTEXTSETUPREQUEST_STRUCT in_ctxt_req;
uint64_t imsi = m_mme_gtpc->ctrl_teid_to_imsi();
bzero(&in_ctxt_req, sizeof(in_ctxt_req));
in_ctxt_req.MME_UE_S1AP_ID = ;
in_ctxt_req.eNB_UE_S1AP_ID =;
in_ctxt_req.uEaggregateMaximumBitrate =;
in_ctxt_req.MME_UE_S1AP_ID.MME_UE_S1AP_ID = ue_ctx->mme_ue_s1ap_id;
in_ctxt_req.eNB_UE_S1AP_ID.ENB_UE_S1AP_ID = ue_ctx->enb_ue_s1ap_id;
in_ctxt_req.uEaggregateMaximumBitrate.uEaggregateMaximumBitRateDL.BitRate=4294967295;//2^32-1
in_ctxt_req.uEaggregateMaximumBitrate.uEaggregateMaximumBitRateUL.BitRate=4294967295;//FIXME Get UE-AMBR from HSS
//eRAB context to setup
LIBLTE_S1AP_E_RABSETUPITEMCTXTSURES_STRUCT *erab_ctxt = &in_ctxt_req.E_RABToBeSetupListCtxtSUReq.buffer[0]; //FIXME?
erab_ctxt->e_RAB_ID = cs_resp->bearer_context_created.ebi;
erab_ctxt->transportLayerAddress = cs_resp->bearer_context_created.sender_f_teid.ipv4;
erab_ctxt->gTP_TEID = cs_resp->bearer_context_created.sender_f_teid.teid;
LIBLTE_S1AP_E_RABTOBESETUPITEMCTXTSUREQ_STRUCT *erab_ctxt = &in_ctxt_req.E_RABToBeSetupListCtxtSUReq.buffer[0]; //FIXME?
erab_ctxt->e_RAB_ID.E_RAB_ID = cs_resp->eps_bearer_context_created.ebi;
if (cs_resp->eps_bearer_context_created.s1_u_sgw_f_teid_present == false){
m_s1ap_log->error("Did not receive S1-U TEID in create session response\n");
return false;
}
erab_ctxt->transportLayerAddress = cs_resp->eps_bearer_context_created.s1_u_sgw_f_teid.ipv4;
memcpy(erab_ctxt->gTP_TEID.buffer, cs_resp->eps_bearer_context_created.sender_f_teid.teid, sizeof(uint64_t));
in_ctxt_req->UESecurityCapabilities =;
in_ctxt_req->SecurityKey = ;
@ -589,6 +593,17 @@ s1ap::send_initial_context_setup_request(struct srslte::gtpc_create_session_resp
bool iE_Extensions_present;
}LIBLTE_S1AP_E_RABSETUPITEMCTXTSURES_STRUCT;
*/
/*typedef struct{
bool ext;
uint32_t n_bits;
uint8_t buffer[160];
}LIBLTE_S1AP_TRANSPORTLAYERADDRESS_STRUCT;
*/
/*
typedef struct{
uint8_t buffer[4];
}LIBLTE_S1AP_GTP_TEID_STRUCT;
*/
/*typedef struct{
bool ext;
LIBLTE_S1AP_MME_UE_S1AP_ID_STRUCT MME_UE_S1AP_ID;