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Starting to add the ability to handle UE context release complete.

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master
Pedro Alvarez 7 years ago
parent 0da56b6a5a
commit d932a2ad85
5 changed files with 71 additions and 12 deletions
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1
srsepc/hdr/mme/s1ap_common.h
Unescape Escape View File

@ -140,6 +140,7 @@ typedef struct{
emm_state_t state;
uint32_t mme_ue_s1ap_id;
uint8_t attach_type;
struct in_addr ue_ip;
srslte::gtpc_f_teid_ie sgw_ctrl_fteid;
} ue_emm_ctx_t;

1
srsepc/hdr/mme/s1ap_ctx_mngmt_proc.h
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@ -52,6 +52,7 @@ public:
bool handle_initial_context_setup_response(LIBLTE_S1AP_MESSAGE_INITIALCONTEXTSETUPRESPONSE_STRUCT *in_ctxt_resp);
bool handle_ue_context_release_request(LIBLTE_S1AP_MESSAGE_UECONTEXTRELEASEREQUEST_STRUCT *ue_rel, struct sctp_sndrcvinfo *enb_sri, srslte::byte_buffer_t *reply_buffer, bool *reply_flag);
bool send_ue_context_release_command(ue_ecm_ctx_t *ecm_ctx, srslte::byte_buffer_t *reply_buffer);
bool handle_ue_context_release_complete(LIBLTE_S1AP_MESSAGE_UECONTEXTRELEASECOMPLETE_STRUCT *rel_comp);
private:
s1ap_ctx_mngmt_proc();

3
srsepc/src/mme/s1ap.cc
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@ -283,6 +283,9 @@ s1ap::handle_successful_outcome(LIBLTE_S1AP_SUCCESSFULOUTCOME_STRUCT *msg)
case LIBLTE_S1AP_SUCCESSFULOUTCOME_CHOICE_INITIALCONTEXTSETUPRESPONSE:
m_s1ap_log->info("Received Initial Context Setup Response.\n");
return m_s1ap_ctx_mngmt_proc->handle_initial_context_setup_response(&msg->choice.InitialContextSetupResponse);
case LIBLTE_S1AP_SUCCESSFULOUTCOME_CHOICE_UECONTEXTRELEASECOMPLETE:
m_s1ap_log->info("Received UE Context Release Complete\n");
return m_s1ap_ctx_mngmt_proc->handle_ue_context_release_complete(&msg->choice.UEContextReleaseComplete);
default:
m_s1ap_log->error("Unhandled successful outcome message: %s\n", liblte_s1ap_successfuloutcome_choice_text[msg->choice_type]);
}

57
srsepc/src/mme/s1ap_ctx_mngmt_proc.cc
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@ -349,5 +349,62 @@ s1ap_ctx_mngmt_proc::send_ue_context_release_command(ue_ecm_ctx_t *ecm_ctx, srsl
return true;
}
bool
s1ap_ctx_mngmt_proc::handle_ue_context_release_complete(LIBLTE_S1AP_MESSAGE_UECONTEXTRELEASECOMPLETE_STRUCT *rel_comp)
{
/*
typedef struct{
bool ext;
LIBLTE_S1AP_MME_UE_S1AP_ID_STRUCT MME_UE_S1AP_ID;
LIBLTE_S1AP_ENB_UE_S1AP_ID_STRUCT eNB_UE_S1AP_ID;
LIBLTE_S1AP_CRITICALITYDIAGNOSTICS_STRUCT CriticalityDiagnostics;
bool CriticalityDiagnostics_present;
LIBLTE_S1AP_USERLOCATIONINFORMATION_STRUCT UserLocationInformation;
bool UserLocationInformation_present;
}LIBLTE_S1AP_MESSAGE_UECONTEXTRELEASECOMPLETE_STRUCT;
*/
uint32_t mme_ue_s1ap_id = rel_comp->MME_UE_S1AP_ID.MME_UE_S1AP_ID;
m_s1ap_log->info("Received UE Context Release Complete. MME-UE S1AP Id: %d\n", mme_ue_s1ap_id);
m_s1ap_log->console("Received UE Context Release Complete. MME-UE S1AP Id %d\n", mme_ue_s1ap_id);
ue_ctx_t * ue_ctx = m_s1ap->find_ue_ctx_from_mme_ue_s1ap_id(mme_ue_s1ap_id);
if(ue_ctx == NULL)
{
m_s1ap_log->info("No UE context to release found. MME-UE S1AP Id: %d\n", mme_ue_s1ap_id);
m_s1ap_log->console("No UE context to release found. MME-UE S1AP Id: %d\n", mme_ue_s1ap_id);
return false;
}
ue_ecm_ctx_t *ecm_ctx = &ue_ctx->ecm_ctx;
//Delete user plane context at the SPGW (but keep GTP-C connection).
if (ecm_ctx->state == ECM_STATE_CONNECTED)
{
//There are active E-RABs, send release access mearers request
m_s1ap_log->console("There are active E-RABs, send release access mearers request");
m_s1ap_log->info("There are active E-RABs, send release access mearers request");
m_mme_gtpc->send_release_access_bearers_request(ecm_ctx->imsi);
//The handle_releease_access_bearers_response function will make sure to mark E-RABS DEACTIVATED
//It will release the UEs downstream S1-u and keep the upstream S1-U connection active.
}
else
{
//No ECM Context to release
m_s1ap_log->info("UE is not ECM connected. No need to release S1-U. MME UE S1AP Id %d\n", mme_ue_s1ap_id);
m_s1ap_log->console("UE is not ECM connected. No need to release S1-U. MME UE S1AP Id %d\n", mme_ue_s1ap_id);
//Make sure E-RABS are merked as DEACTIVATED.
for(int i=0;i<MAX_ERABS_PER_UE;i++)
{
ecm_ctx->erabs_ctx[i].state = ERAB_DEACTIVATED;
}
}
//Delete UE context
m_s1ap->release_ue_ecm_ctx(ue_ctx->ecm_ctx.mme_ue_s1ap_id);
m_s1ap_log->info("UE Context Release Completed.\n");
m_s1ap_log->console("UE Context Release Completed.\n");
return true;
}
} //namespace srsepc

21
srsepc/src/mme/s1ap_nas_transport.cc
Unescape Escape View File

@ -699,12 +699,14 @@ s1ap_nas_transport::handle_nas_service_request(uint32_t m_tmsi,
//Save whether secure ESM information transfer is necessary
ecm_ctx->eit = false;
//Initialize E-RABs
for(uint i = 0 ; i< MAX_ERABS_PER_UE; i++)
//Get UE IP, and uplink F-TEID
if(emm_ctx->ue_ip.s_addr == 0 )
{
ecm_ctx->erabs_ctx[i].state = ERAB_DEACTIVATED;
ecm_ctx->erabs_ctx[i].erab_id = i;
m_s1ap_log->error("UE has no valid IP assigned upon reception of service request");
}
m_s1ap_log->console("UE previously assigned IP: %s",inet_ntoa(emm_ctx->ue_ip));
//Mark E-RABs as setup, but not active yet
//Re-generate K_eNB
liblte_security_generate_k_enb(emm_ctx->security_ctxt.k_asme, emm_ctx->security_ctxt.ul_nas_count, emm_ctx->security_ctxt.k_enb);
@ -932,16 +934,11 @@ s1ap_nas_transport::handle_identity_response(srslte::byte_buffer_t *nas_msg, ue_
m_s1ap_log->info("Id Response -- IMSI: %015lu\n", imsi);
m_s1ap_log->console("Id Response -- IMSI: %015lu\n", imsi);
ecm_ctx->imsi = imsi;
//Get UE EMM context
//if(m_s1ap->get_tmp_ue_emm_ctx(ue_ecm_ctx->mme_ue_s1ap_id, &ue_emm_ctx) == false)
//{
// m_s1ap_log->error("Could not find UE's temporary EMM context. MME UE S1AP Id: %d\n",ue_ecm_ctx->mme_ue_s1ap_id);
// return false;
//}
//Set UE's context IMSI
emm_ctx->imsi=imsi;
ecm_ctx->imsi = imsi;
//Get Authentication Vectors from HSS
if(!m_hss->gen_auth_info_answer(imsi, emm_ctx->security_ctxt.k_asme, autn, rand, emm_ctx->security_ctxt.xres))
{

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