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[MME] KeNB derive from TAU(active flag=1) (#2063)
TS33.401 7 Security procedures between UE and EPS access network elements 7.2 Handling of user-related keys in E-UTRAN 7.2.7 Key handling for the TAU procedure when registered in E-UTRAN If the "active flag" is set in the TAU request message or the MME chooses to establish radio bearers when there is pending downlink UP data or pending downlink signalling, radio bearers will be established as part of the TAU procedure and a KeNB derivation is necessary.
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@ -496,6 +496,23 @@ static void common_register_state(ogs_fsm_t *s, mme_event_t *e)
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if (e->s1ap_code == S1AP_ProcedureCode_id_initialUEMessage) {
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ogs_debug(" Iniital UE Message");
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if (mme_ue->nas_eps.update.active_flag) {
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/*
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* TS33.401
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* 7 Security procedures between UE and EPS access network elements
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* 7.2 Handling of user-related keys in E-UTRAN
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* 7.2.7 Key handling for the TAU procedure when registered in E-UTRAN
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*
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* If the "active flag" is set in the TAU request message or
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* the MME chooses to establish radio bearers when there is pending downlink
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* UP data or pending downlink signalling, radio bearers will be established
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* as part of the TAU procedure and a KeNB derivation is necessary.
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*/
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ogs_kdf_kenb(mme_ue->kasme, mme_ue->ul_count.i32,
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mme_ue->kenb);
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ogs_kdf_nh_enb(mme_ue->kasme, mme_ue->kenb, mme_ue->nh);
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mme_ue->nhcc = 1;
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r = nas_eps_send_tau_accept(mme_ue,
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S1AP_ProcedureCode_id_InitialContextSetup);
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ogs_expect(r == OGS_OK);
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