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mme: s1ap: Split rx HandoverRequired handling based on HandoverType 

This is a preparation towards adding other handover types in the future.
This commit is contained in:
Pau Espin 2023-07-13 16:38:56 +02:00 committed by Sukchan Lee
parent 154bff2764
commit 11d10fb009
1 changed files with 80 additions and 49 deletions
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129
src/mme/s1ap-handler.c
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@ -2331,6 +2331,74 @@ void s1ap_handle_enb_configuration_transfer(
}
}
static void s1ap_handle_handover_required_intralte(enb_ue_t *source_ue,
S1AP_Cause_t *Cause, S1AP_TargetID_t *TargetID,
S1AP_Source_ToTarget_TransparentContainer_t *Source_ToTarget_TransparentContainer)
{
mme_enb_t *target_enb = NULL;
uint32_t target_enb_id = 0;
mme_ue_t *mme_ue = NULL;
int r;
ogs_assert(source_ue);
ogs_assert(Cause);
ogs_assert(TargetID);
ogs_assert(Source_ToTarget_TransparentContainer);
switch (TargetID->present) {
case S1AP_TargetID_PR_targeteNB_ID:
ogs_s1ap_ENB_ID_to_uint32(
&TargetID->choice.targeteNB_ID->global_ENB_ID.eNB_ID,
&target_enb_id);
break;
default:
ogs_error("Not implemented(%d)", TargetID->present);
r = s1ap_send_handover_preparation_failure(source_ue,
S1AP_Cause_PR_protocol, S1AP_CauseProtocol_semantic_error);
ogs_expect(r == OGS_OK);
ogs_assert(r != OGS_ERROR);
return;
}
target_enb = mme_enb_find_by_enb_id(target_enb_id);
if (target_enb == NULL) {
ogs_error("Handover required : cannot find target eNB-id[0x%x]",
target_enb_id);
r = s1ap_send_handover_preparation_failure(source_ue,
S1AP_Cause_PR_radioNetwork,
S1AP_CauseRadioNetwork_unknown_targetID);
ogs_expect(r == OGS_OK);
ogs_assert(r != OGS_ERROR);
return;
}
mme_ue = source_ue->mme_ue;
if (!mme_ue) {
ogs_error("No UE(mme-ue) context");
return;
}
if (!SECURITY_CONTEXT_IS_VALID(mme_ue)) {
ogs_error("No Security Context");
r = s1ap_send_handover_preparation_failure(source_ue,
S1AP_Cause_PR_nas, S1AP_CauseNas_authentication_failure);
ogs_expect(r == OGS_OK);
ogs_assert(r != OGS_ERROR);
return;
}
source_ue->handover_type = S1AP_HandoverType_intralte;
mme_ue->nhcc++;
ogs_kdf_nh_enb(mme_ue->kasme, mme_ue->nh, mme_ue->nh);
r = s1ap_send_handover_request(
source_ue, target_enb, &source_ue->handover_type, Cause,
Source_ToTarget_TransparentContainer);
ogs_expect(r == OGS_OK);
ogs_assert(r != OGS_ERROR);
}
void s1ap_handle_handover_required(mme_enb_t *enb, ogs_s1ap_message_t *message)
{
char buf[OGS_ADDRSTRLEN];
@ -2358,9 +2426,6 @@ void s1ap_handle_handover_required(mme_enb_t *enb, ogs_s1ap_message_t *message)
ogs_assert(HandoverRequired);
enb_ue_t *source_ue = NULL;
mme_ue_t *mme_ue = NULL;
mme_enb_t *target_enb = NULL;
uint32_t target_enb_id = 0;
ogs_debug("HandoverRequired");
for (i = 0; i < HandoverRequired->protocolIEs.list.count; i++) {
@ -2462,58 +2527,24 @@ void s1ap_handle_handover_required(mme_enb_t *enb, ogs_s1ap_message_t *message)
return;
}
switch (TargetID->present) {
case S1AP_TargetID_PR_targeteNB_ID:
ogs_s1ap_ENB_ID_to_uint32(
&TargetID->choice.targeteNB_ID->global_ENB_ID.eNB_ID,
&target_enb_id);
switch (*HandoverType) {
case S1AP_HandoverType_intralte:
s1ap_handle_handover_required_intralte(source_ue, Cause, TargetID, Source_ToTarget_TransparentContainer);
break;
default:
ogs_error("Not implemented(%d)", TargetID->present);
case S1AP_HandoverType_ltetoutran:
case S1AP_HandoverType_ltetogeran:
case S1AP_HandoverType_utrantolte:
case S1AP_HandoverType_gerantolte:
case S1AP_HandoverType_eps_to_5gs:
case S1AP_HandoverType_fivegs_to_eps:
default: /* Enumeration is extensible */
ogs_error("Rx Handover Required HandoverType=%ld not implemented!", *HandoverType);
r = s1ap_send_handover_preparation_failure(source_ue,
S1AP_Cause_PR_protocol, S1AP_CauseProtocol_semantic_error);
ogs_expect(r == OGS_OK);
ogs_assert(r != OGS_ERROR);
return;
break;
}
target_enb = mme_enb_find_by_enb_id(target_enb_id);
if (target_enb == NULL) {
ogs_error("Handover required : cannot find target eNB-id[0x%x]",
target_enb_id);
r = s1ap_send_handover_preparation_failure(source_ue,
S1AP_Cause_PR_radioNetwork,
S1AP_CauseRadioNetwork_unknown_targetID);
ogs_expect(r == OGS_OK);
ogs_assert(r != OGS_ERROR);
return;
}
mme_ue = source_ue->mme_ue;
if (!mme_ue) {
ogs_error("No UE(mme-ue) context");
return;
}
if (!SECURITY_CONTEXT_IS_VALID(mme_ue)) {
ogs_error("No Security Context");
r = s1ap_send_handover_preparation_failure(source_ue,
S1AP_Cause_PR_nas, S1AP_CauseNas_authentication_failure);
ogs_expect(r == OGS_OK);
ogs_assert(r != OGS_ERROR);
return;
}
source_ue->handover_type = *HandoverType;
mme_ue->nhcc++;
ogs_kdf_nh_enb(mme_ue->kasme, mme_ue->nh, mme_ue->nh);
r = s1ap_send_handover_request(
source_ue, target_enb, HandoverType, Cause,
Source_ToTarget_TransparentContainer);
ogs_expect(r == OGS_OK);
ogs_assert(r != OGS_ERROR);
}
void s1ap_handle_handover_request_ack(