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Adapting send modify bearer request to new GTP-C context

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master
Pedro Alvarez 7 years ago
parent 0c50ccef1c
commit 98345ed6a2
4 changed files with 54 additions and 31 deletions
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6
srsepc/hdr/mme/mme_gtpc.h
Unescape Escape View File

@ -42,10 +42,10 @@ class mme_gtpc
{
public:
struct gtpc_ctx{
typedef struct gtpc_ctx{
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);
@ -54,7 +54,7 @@ public:
uint32_t get_new_ctrl_teid();
void send_create_session_request(uint64_t imsi, bool pack_attach);
void handle_create_session_response(srslte::gtpc_pdu *cs_resp_pdu, bool pack_attach);
void send_modify_bearer_request(erab_ctx_t *bearer_ctx);
void send_modify_bearer_request(uint64_t imsi, erab_ctx_t *bearer_ctx);
void handle_modify_bearer_response(srslte::gtpc_pdu *mb_resp_pdu);
void send_delete_session_request(ue_ecm_ctx_t *ue_ecm_ctx);

71
srsepc/src/mme/mme_gtpc.cc
Unescape Escape View File

@ -145,6 +145,12 @@ mme_gtpc::send_create_session_request(uint64_t imsi, bool pack_attach)
//Save RX Control TEID
m_mme_ctr_teid_to_imsi.insert(std::pair<uint32_t,uint64_t>(cs_req->sender_f_teid.teid, imsi));
//Save GTP-C context
gtpc_ctx_t gtpc_ctx;
bzero(&gtpc_ctx,sizeof(gtpc_ctx_t));
gtpc_ctx.mme_ctr_fteid = cs_req->sender_f_teid;
m_imsi_to_gtpc_ctx.insert(std::pair<uint64_t,gtpc_ctx_t>(imsi,gtpc_ctx));
m_spgw->handle_create_session_request(cs_req, &cs_resp_pdu, pack_attach);
}
@ -158,7 +164,7 @@ mme_gtpc::handle_create_session_response(srslte::gtpc_pdu *cs_resp_pdu, bool pac
if (cs_resp_pdu->header.type != srslte::GTPC_MSG_TYPE_CREATE_SESSION_RESPONSE)
{
m_mme_gtpc_log->warning("Could not create GTPC session. Not a create session response\n");
//TODO Handle err
//TODO Handle error
return;
}
if (cs_resp->cause.cause_value != srslte::GTPC_CAUSE_VALUE_REQUEST_ACCEPTED){
@ -167,29 +173,29 @@ mme_gtpc::handle_create_session_response(srslte::gtpc_pdu *cs_resp_pdu, bool pac
return;
}
//Get MME_UE_S1AP_ID from the control TEID
std::map<uint32_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())
//Get IMSI from the control TEID
std::map<uint32_t,uint64_t>::iterator id_it = m_mme_ctr_teid_to_imsi.find(cs_resp_pdu->header.teid);
if(id_it == m_mme_ctr_teid_to_imsi.end())
{
//Could not find MME UE S1AP TEID
m_mme_gtpc_log->warning("Could not find MME UE S1AP TEID.\n");
m_mme_gtpc_log->warning("Could not find IMSI from Ctrl TEID.\n");
return;
}
uint32_t mme_s1ap_id = id_it->second;
uint64_t imsi = id_it->second;
m_mme_gtpc_log->info("MME GTPC Ctrl TEID %d, IMSI %d\n", cs_resp_pdu->header.teid, imsi);
m_mme_gtpc_log->info("MME GTPC Ctrl TEID %d, MME UE S1AP Id %d\n", cs_resp_pdu->header.teid, mme_s1ap_id);
//Get S-GW Control F-TEID
srslte::gtpc_f_teid_ie sgw_ctrl_fteid;
sgw_ctrl_fteid.teid = cs_resp_pdu->header.teid;
sgw_ctrl_fteid.ipv4 = 0; //FIXME This is not used for now. In the future it will be obtained from the socket addr_info
srslte::gtp_fteid_t sgw_ctr_fteid;
sgw_ctr_fteid.teid = cs_resp_pdu->header.teid;
sgw_ctr_fteid.ipv4 = 0; //FIXME This is not used for now. In the future it will be obtained from the socket addr_info
//Get S-GW S1-u F-TEID
if (cs_resp->eps_bearer_context_created.s1_u_sgw_f_teid_present == false){
m_mme_gtpc_log->error("Did not receive SGW S1-U F-TEID in create session response\n");
return;
}
m_mme_gtpc_log->console("Create Session Response -- SPGW control TEID %d\n", sgw_ctrl_fteid.teid);
m_mme_gtpc_log->info("Create Session Response -- SPGW control TEID %d\n", sgw_ctrl_fteid.teid);
m_mme_gtpc_log->console("Create Session Response -- SPGW control TEID %d\n", sgw_ctr_fteid.teid);
m_mme_gtpc_log->info("Create Session Response -- SPGW control TEID %d\n", sgw_ctr_fteid.teid);
in_addr s1u_addr;
s1u_addr.s_addr = cs_resp->eps_bearer_context_created.s1_u_sgw_f_teid.ipv4;
m_mme_gtpc_log->console("Create Session Response -- SPGW S1-U Address: %s\n", inet_ntoa(s1u_addr));
@ -208,23 +214,33 @@ mme_gtpc::handle_create_session_response(srslte::gtpc_pdu *cs_resp_pdu, bool pac
}
//Save create session response info to E-RAB context
ue_ecm_ctx_t *ecm_ctx = m_s1ap->find_ue_ecm_ctx_from_mme_ue_s1ap_id(mme_s1ap_id);
if(ecm_ctx ==NULL){
ue_emm_ctx_t *emm_ctx = m_s1ap->find_ue_emm_ctx_from_imsi(imsi);
if(emm_ctx == NULL){
m_mme_gtpc_log->error("Could not find UE EMM context\n");
return;
}
ue_ecm_ctx_t *ecm_ctx = m_s1ap->find_ue_ecm_ctx_from_mme_ue_s1ap_id(emm_ctx->mme_ue_s1ap_id);
if(ecm_ctx == NULL){
m_mme_gtpc_log->error("Could not find UE ECM context\n");
return;
}
ue_emm_ctx_t *emm_ctx = m_s1ap->find_ue_emm_ctx_from_imsi(ecm_ctx->imsi);
if(emm_ctx ==NULL){
m_mme_gtpc_log->error("Could not find UE EMM context\n");
//Save SGW ctrl F-TEID in GTP-C context
std::map<uint64_t,struct gtpc_ctx>::iterator it_g = m_imsi_to_gtpc_ctx.find(imsi);
if(it_g == m_imsi_to_gtpc_ctx.end())
{
//Could not find GTP-C Context
m_mme_gtpc_log->error("Could not find GTP-C context\n");
return;
}
gtpc_ctx_t *gtpc_ctx = &it_g->second;
gtpc_ctx->sgw_ctr_fteid = sgw_ctr_fteid;
//Set EPS bearer context
//FIXME default EPS bearer is hard-coded
int default_bearer=5;
erab_ctx_t *erab_ctx = &ecm_ctx->erabs_ctx[default_bearer];
erab_ctx->pdn_addr_alloc= cs_resp->paa;
erab_ctx->sgw_ctrl_fteid = sgw_ctrl_fteid;
erab_ctx->sgw_s1u_fteid = cs_resp->eps_bearer_context_created.s1_u_sgw_f_teid;
m_s1ap->m_s1ap_ctx_mngmt_proc->send_initial_context_setup_request(emm_ctx, ecm_ctx, erab_ctx, pack_attach);
@ -232,16 +248,23 @@ mme_gtpc::handle_create_session_response(srslte::gtpc_pdu *cs_resp_pdu, bool pac
void
mme_gtpc::send_modify_bearer_request(erab_ctx_t *erab_ctx)
mme_gtpc::send_modify_bearer_request(uint64_t imsi, erab_ctx_t *erab_ctx)
{
m_mme_gtpc_log->info("Sending GTP-C Modify bearer request\n");
srslte::gtpc_pdu mb_req_pdu;
srslte::gtpc_f_teid_ie *enb_fteid = &erab_ctx->enb_fteid;
srslte::gtpc_f_teid_ie *sgw_ctrl_fteid = &erab_ctx->sgw_ctrl_fteid;
srslte::gtp_fteid_t *enb_fteid = &erab_ctx->enb_fteid;
std::map<uint64_t,gtpc_ctx_t>::iterator it = m_imsi_to_gtpc_ctx.find(imsi);
if(it == m_imsi_to_gtpc_ctx.end())
{
m_mme_gtpc_log->error("Modify bearer request for UE without GTP-C connection\n");
return;
}
srslte::gtp_fteid_t sgw_ctr_fteid = it->second.sgw_ctr_fteid;
srslte::gtpc_header *header = &mb_req_pdu.header;
header->teid_present = true;
header->teid = sgw_ctrl_fteid->teid;
header->teid = sgw_ctr_fteid.teid;
header->type = srslte::GTPC_MSG_TYPE_MODIFY_BEARER_REQUEST;
srslte::gtpc_modify_bearer_request *mb_req = &mb_req_pdu.choice.modify_bearer_request;
@ -249,7 +272,7 @@ mme_gtpc::send_modify_bearer_request(erab_ctx_t *erab_ctx)
mb_req->eps_bearer_context_to_modify.s1_u_enb_f_teid.ipv4 = enb_fteid->ipv4;
mb_req->eps_bearer_context_to_modify.s1_u_enb_f_teid.teid = enb_fteid->teid;
m_mme_gtpc_log->info("GTP-C Modify bearer request -- S-GW Control TEID %d\n", sgw_ctrl_fteid->teid );
m_mme_gtpc_log->info("GTP-C Modify bearer request -- S-GW Control TEID %d\n", sgw_ctr_fteid.teid );
struct in_addr addr;
addr.s_addr = enb_fteid->ipv4;
m_mme_gtpc_log->info("GTP-C Modify bearer request -- S1-U TEID 0x%x, IP %s\n", enb_fteid->teid, inet_ntoa(addr) );

2
srsepc/src/mme/s1ap_ctx_mngmt_proc.cc
Unescape Escape View File

@ -246,7 +246,7 @@ s1ap_ctx_mngmt_proc::handle_initial_context_setup_response(LIBLTE_S1AP_MESSAGE_I
}
if(send_modify)
{
m_mme_gtpc->send_modify_bearer_request(&ue_ecm_ctx->erabs_ctx[5]);
m_mme_gtpc->send_modify_bearer_request(ue_ecm_ctx->imsi, &ue_ecm_ctx->erabs_ctx[5]);
}
send_modify = true;
return true;

2
srsepc/src/mme/s1ap_nas_transport.cc
Unescape Escape View File

@ -861,7 +861,7 @@ s1ap_nas_transport::handle_nas_attach_complete(srslte::byte_buffer_t *nas_msg, u
m_s1ap_log->error("EPS Bearer ID out of range\n");
return false;
}
m_mme_gtpc->send_modify_bearer_request(&ue_ecm_ctx->erabs_ctx[act_bearer.eps_bearer_id]);
m_mme_gtpc->send_modify_bearer_request(ue_ecm_ctx->imsi, &ue_ecm_ctx->erabs_ctx[act_bearer.eps_bearer_id]);
//Send reply to eNB
m_s1ap_log->console("Packing EMM infromationi\n");

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