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Starting the code to send ctx setup request to eNB

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master
Pedro Alvarez 7 years ago
parent 103361deb9
commit c1d550ddab
1 changed files with 37 additions and 85 deletions
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120
srsepc/src/mme/s1ap.cc
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@ -547,9 +547,12 @@ s1ap::handle_nas_security_mode_complete(srslte::byte_buffer_t *nas_msg, srslte::
bool
s1ap::send_initial_context_setup_request(uint32_t mme_ue_s1ap_id, struct srslte::gtpc_create_session_response *cs_resp)
{
ue_ctx_t *ue_ctx;
LIBLTE_S1AP_MESSAGE_INITIALCONTEXTSETUPREQUEST_STRUCT in_ctxt_req;
LIBLTE_S1AP_E_RABTOBESETUPITEMCTXTSUREQ_STRUCT *erab_ctxt = &in_ctxt_req.E_RABToBeSetupListCtxtSUReq.buffer[0]; //FIXME support more than one erab
srslte::byte_buffer_t *reply_buffer = m_pool->allocate();
//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())
{
@ -558,20 +561,23 @@ s1ap::send_initial_context_setup_request(uint32_t mme_ue_s1ap_id, struct srslte:
}
ue_ctx = ue_ctx_it->second;
LIBLTE_S1AP_MESSAGE_INITIALCONTEXTSETUPREQUEST_STRUCT in_ctxt_req;
//Add MME and eNB S1AP Ids
bzero(&in_ctxt_req, sizeof(in_ctxt_req));
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;
//Set UE-AMBR
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_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;
}
//Set S-GW F-TEID
uint32_t sgw_s1u_ip = cs_resp->eps_bearer_context_created.s1_u_sgw_f_teid.ipv4;
uint8_t *tmp_ptr = erab_ctxt->transportLayerAddress.buffer;
liblte_value_2_bits(sgw_s1u_ip, &tmp_ptr, 32);//FIXME consider ipv6
@ -579,94 +585,40 @@ s1ap::send_initial_context_setup_request(uint32_t mme_ue_s1ap_id, struct srslte:
uint32_t tmp_teid = cs_resp->eps_bearer_context_created.s1_u_sgw_f_teid.teid;
memcpy(erab_ctxt->gTP_TEID.buffer, &tmp_teid, sizeof(uint32_t));
//Set UE security capabilities and k_enb
in_ctxt_req.UESecurityCapabilities.encryptionAlgorithms.buffer[0] = 0; //EEA0
in_ctxt_req.UESecurityCapabilities.integrityProtectionAlgorithms.buffer[0] = 1; //EIA1
uint8_t key_enb[32];
liblte_security_generate_k_enb(ue_ctx->security_ctxt.k_asme, ue_ctx->security_ctxt.dl_nas_count, key_enb);
liblte_unpack(key_enb, 32, in_ctxt_req.SecurityKey.buffer);
//liblte_value_2_bits(key_enb,,LIBLTE_S1AP_SECURITYKEY_BIT_STRING_LEN);
/*
typedef struct{
bool ext;
uint8_t buffer[16];
}LIBLTE_S1AP_INTEGRITYPROTECTIONALGORITHMS_STRUCT;
*/
/*
typedef struct{
uint32_t len;
LIBLTE_S1AP_E_RABSETUPITEMCTXTSURES_STRUCT buffer[32]; //WARNING: Artificial limit to reduce memory footprint
}LIBLTE_S1AP_E_RABSETUPLISTCTXTSURES_STRUCT;
*/
/*typedef struct{
bool ext;
LIBLTE_S1AP_E_RAB_ID_STRUCT e_RAB_ID;
LIBLTE_S1AP_TRANSPORTLAYERADDRESS_STRUCT transportLayerAddress;
LIBLTE_S1AP_GTP_TEID_STRUCT gTP_TEID;
LIBLTE_S1AP_PROTOCOLEXTENSIONCONTAINER_STRUCT iE_Extensions;
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_ENCRYPTIONALGORITHMS_STRUCT encryptionAlgorithms;
LIBLTE_S1AP_INTEGRITYPROTECTIONALGORITHMS_STRUCT integrityProtectionAlgorithms;
LIBLTE_S1AP_PROTOCOLEXTENSIONCONTAINER_STRUCT iE_Extensions;
bool iE_Extensions_present;
}LIBLTE_S1AP_UESECURITYCAPABILITIES_STRUCT;
*/
/*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_UEAGGREGATEMAXIMUMBITRATE_STRUCT uEaggregateMaximumBitrate;
LIBLTE_S1AP_E_RABTOBESETUPLISTCTXTSUREQ_STRUCT E_RABToBeSetupListCtxtSUReq;
LIBLTE_S1AP_UESECURITYCAPABILITIES_STRUCT UESecurityCapabilities;
LIBLTE_S1AP_SECURITYKEY_STRUCT SecurityKey;
LIBLTE_S1AP_TRACEACTIVATION_STRUCT TraceActivation;
bool TraceActivation_present;
LIBLTE_S1AP_HANDOVERRESTRICTIONLIST_STRUCT HandoverRestrictionList;
bool HandoverRestrictionList_present;
LIBLTE_S1AP_UERADIOCAPABILITY_STRUCT UERadioCapability;
bool UERadioCapability_present;
LIBLTE_S1AP_SUBSCRIBERPROFILEIDFORRFP_STRUCT SubscriberProfileIDforRFP;
bool SubscriberProfileIDforRFP_present;
LIBLTE_S1AP_CSFALLBACKINDICATOR_ENUM_EXT CSFallbackIndicator;
bool CSFallbackIndicator_present;
LIBLTE_S1AP_SRVCCOPERATIONPOSSIBLE_ENUM_EXT SRVCCOperationPossible;
bool SRVCCOperationPossible_present;
LIBLTE_S1AP_CSGMEMBERSHIPSTATUS_ENUM CSGMembershipStatus;
bool CSGMembershipStatus_present;
LIBLTE_S1AP_LAI_STRUCT RegisteredLAI;
bool RegisteredLAI_present;
LIBLTE_S1AP_GUMMEI_STRUCT GUMMEI_ID;
bool GUMMEI_ID_present;
LIBLTE_S1AP_MME_UE_S1AP_ID_STRUCT MME_UE_S1AP_ID_2;
bool MME_UE_S1AP_ID_2_present;
LIBLTE_S1AP_MANAGEMENTBASEDMDTALLOWED_ENUM_EXT ManagementBasedMDTAllowed;
bool ManagementBasedMDTAllowed_present;
LIBLTE_S1AP_MDTPLMNLIST_STRUCT ManagementBasedMDTPLMNList;
bool ManagementBasedMDTPLMNList_present;
LIBLTE_S1AP_ADDITIONALCSFALLBACKINDICATOR_ENUM_EXT AdditionalCSFallbackIndicator;
bool AdditionalCSFallbackIndicator_present;
}LIBLTE_S1AP_MESSAGE_INITIALCONTEXTSETUPREQUEST_STRUCT;*/
//Set Attach accepted and activate defaulte bearer NAS messages
//TODO
//Pack everything and send it to the eNB
LIBLTE_ERROR_ENUM err = liblte_s1ap_pack_s1ap_pdu(&in_ctxt_req, (LIBLTE_BYTE_MSG_STRUCT*)reply_buffer);
if(err != LIBLTE_SUCCESS)
{
m_s1ap_log->error("Could not pack Initial Context Setup Request Message\n");
return false;
}
//Send Reply to eNB
ssize_t n_sent = sctp_send(m_s1mme,reply_msg->msg, reply_msg->N_bytes, enb_sri, 0);
if(n_sent == -1)
{
m_s1ap_log->error("Failed to send Initial Context Setup Request\n");
return false;
}
m_pool->deallocate(reply_buffer);
return true;
}
bool
s1ap::handle_ue_context_release_request(LIBLTE_S1AP_MESSAGE_UECONTEXTRELEASEREQUEST_STRUCT *ue_rel, struct sctp_sndrcvinfo *enb_sri)
{
bool
s1ap::handle_ue_context_release_request(LIBLTE_S1AP_MESSAGE_UECONTEXTRELEASEREQUEST_STRUCT *ue_rel, struct sctp_sndrcvinfo *enb_sri)
{
uint32_t mme_ue_s1ap_id = ue_rel->MME_UE_S1AP_ID.MME_UE_S1AP_ID;
m_s1ap_log->info("Received UE Context Release Request. MME-UE S1AP Id: %d\n", mme_ue_s1ap_id);

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