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open5gs/src/mme/s1ap_handler.c

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#define TRACE_MODULE _s1ap_handler
#include "core_debug.h"
#include "mme_event.h"
#include "mme_kdf.h"
#include "s1ap_conv.h"
#include "s1ap_path.h"
#include "nas_path.h"
#include "mme_gtp_path.h"
#include "mme_s11_build.h"
#include "s1ap_build.h"
#include "s1ap_handler.h"
#include "mme_path.h"
#include "mme_sm.h"
void s1ap_handle_s1_setup_request(mme_enb_t *enb, s1ap_message_t *message)
{
char buf[CORE_ADDRSTRLEN];
int i, j;
S1AP_InitiatingMessage_t *initiatingMessage = NULL;
S1AP_S1SetupRequest_t *S1SetupRequest = NULL;
S1AP_S1SetupRequestIEs_t *ie = NULL;
S1AP_Global_ENB_ID_t *Global_ENB_ID = NULL;
S1AP_SupportedTAs_t *SupportedTAs = NULL;
S1AP_PagingDRX_t *PagingDRX = NULL;
pkbuf_t *s1apbuf = NULL;
c_uint32_t enb_id;
S1AP_Cause_PR group = S1AP_Cause_PR_NOTHING;
long cause = 0;
d_assert(enb, return,);
d_assert(enb->sock, return,);
d_assert(message, return,);
initiatingMessage = message->choice.initiatingMessage;
d_assert(initiatingMessage, return,);
S1SetupRequest = &initiatingMessage->value.choice.S1SetupRequest;
d_assert(S1SetupRequest, return,);
d_trace(3, "[MME] S1-Setup request\n");
for (i = 0; i < S1SetupRequest->protocolIEs.list.count; i++)
{
ie = S1SetupRequest->protocolIEs.list.array[i];
switch(ie->id)
{
case S1AP_ProtocolIE_ID_id_Global_ENB_ID:
Global_ENB_ID = &ie->value.choice.Global_ENB_ID;
break;
case S1AP_ProtocolIE_ID_id_SupportedTAs:
SupportedTAs = &ie->value.choice.SupportedTAs;
break;
case S1AP_ProtocolIE_ID_id_DefaultPagingDRX:
PagingDRX = &ie->value.choice.PagingDRX;
break;
default:
break;
}
}
d_assert(Global_ENB_ID, return,);
s1ap_ENB_ID_to_uint32(&Global_ENB_ID->eNB_ID, &enb_id);
d_trace(5, " IP[%s] ENB_ID[%d]\n", CORE_ADDR(enb->addr, buf), enb_id);
if (PagingDRX)
d_trace(5, " PagingDRX[%ld]\n", *PagingDRX);
mme_enb_set_enb_id(enb, enb_id);
d_assert(SupportedTAs, return,);
/* Parse Supported TA */
enb->num_of_supported_ta_list = 0;
for (i = 0; i < SupportedTAs->list.count; i++)
{
S1AP_SupportedTAs_Item_t *SupportedTAs_Item = NULL;
S1AP_TAC_t *tAC = NULL;
SupportedTAs_Item =
(S1AP_SupportedTAs_Item_t *)SupportedTAs->list.array[i];
d_assert(SupportedTAs_Item, return,);
tAC = &SupportedTAs_Item->tAC;
d_assert(tAC, return,);
for (j = 0; j < SupportedTAs_Item->broadcastPLMNs.list.count; j++)
{
S1AP_PLMNidentity_t *pLMNidentity = NULL;
pLMNidentity = (S1AP_PLMNidentity_t *)
SupportedTAs_Item->broadcastPLMNs.list.array[j];
d_assert(pLMNidentity, return,);
memcpy(&enb->supported_ta_list[enb->num_of_supported_ta_list].tac,
tAC->buf, sizeof(c_uint16_t));
enb->supported_ta_list[enb->num_of_supported_ta_list].tac =
ntohs(enb->supported_ta_list
[enb->num_of_supported_ta_list].tac);
memcpy(&enb->supported_ta_list
[enb->num_of_supported_ta_list].plmn_id,
pLMNidentity->buf, sizeof(plmn_id_t));
d_trace(5, " PLMN_ID[MCC:%d MNC:%d] TAC[%d]\n",
plmn_id_mcc(&enb->supported_ta_list
[enb->num_of_supported_ta_list].plmn_id),
plmn_id_mnc(&enb->supported_ta_list
[enb->num_of_supported_ta_list].plmn_id),
enb->supported_ta_list[enb->num_of_supported_ta_list].tac);
enb->num_of_supported_ta_list++;
}
}
if (enb->num_of_supported_ta_list == 0)
{
d_warn("S1-Setup failure:");
d_warn(" No supported TA exist in S1-Setup request");
group = S1AP_Cause_PR_misc;
cause = S1AP_CauseMisc_unspecified;
}
else
{
int served_tai_index = -1;
for (i = 0; i < enb->num_of_supported_ta_list; i++)
{
served_tai_index =
mme_find_served_tai(&enb->supported_ta_list[i]);
if (served_tai_index >= 0 &&
served_tai_index < MAX_NUM_OF_SERVED_TAI)
{
d_trace(5, " SERVED_TAI_INDEX[%d]\n", served_tai_index);
break;
}
}
if (served_tai_index < 0)
{
d_warn("S1-Setup failure:");
d_warn(" Cannot find Served TAI. Check 'mme.tai' configuration");
group = S1AP_Cause_PR_misc;
cause = S1AP_CauseMisc_unknown_PLMN;
}
}
if (group == S1AP_Cause_PR_NOTHING)
{
d_trace(3, "[MME] S1-Setup response\n");
d_assert(s1ap_build_setup_rsp(&s1apbuf) == CORE_OK,
return, "s1ap_build_setup_rsp() failed");
}
else
{
d_trace(3, "[MME] S1-Setup failure\n");
d_assert(s1ap_build_setup_failure(
&s1apbuf, group, cause, S1AP_TimeToWait_v10s) == CORE_OK,
return, "s1ap_build_setup_failure() failed");
}
d_assert(s1ap_send_to_enb(enb, s1apbuf) == CORE_OK,,
"s1ap_send_to_enb() failed");
}
void s1ap_handle_initial_ue_message(mme_enb_t *enb, s1ap_message_t *message)
{
status_t rv;
int i;
char buf[CORE_ADDRSTRLEN];
S1AP_InitiatingMessage_t *initiatingMessage = NULL;
S1AP_InitialUEMessage_t *InitialUEMessage = NULL;
S1AP_InitialUEMessage_IEs_t *ie = NULL;
S1AP_ENB_UE_S1AP_ID_t *ENB_UE_S1AP_ID = NULL;
S1AP_NAS_PDU_t *NAS_PDU = NULL;
S1AP_TAI_t *TAI = NULL;
S1AP_EUTRAN_CGI_t *EUTRAN_CGI = NULL;
S1AP_S_TMSI_t *S_TMSI = NULL;
S1AP_PLMNidentity_t *pLMNidentity = NULL;
S1AP_TAC_t *tAC = NULL;
S1AP_CellIdentity_t *cell_ID = NULL;
enb_ue_t *enb_ue = NULL;
d_assert(enb, return,);
d_assert(enb->sock, return,);
d_assert(message, return,);
initiatingMessage = message->choice.initiatingMessage;
d_assert(initiatingMessage, return,);
InitialUEMessage = &initiatingMessage->value.choice.InitialUEMessage;
d_assert(InitialUEMessage, return,);
d_trace(3, "[MME] Initial UE Message\n");
for (i = 0; i < InitialUEMessage->protocolIEs.list.count; i++)
{
ie = InitialUEMessage->protocolIEs.list.array[i];
switch(ie->id)
{
case S1AP_ProtocolIE_ID_id_eNB_UE_S1AP_ID:
ENB_UE_S1AP_ID = &ie->value.choice.ENB_UE_S1AP_ID;
break;
case S1AP_ProtocolIE_ID_id_NAS_PDU:
NAS_PDU = &ie->value.choice.NAS_PDU;
break;
case S1AP_ProtocolIE_ID_id_TAI:
TAI = &ie->value.choice.TAI;
break;
case S1AP_ProtocolIE_ID_id_EUTRAN_CGI:
EUTRAN_CGI = &ie->value.choice.EUTRAN_CGI;
break;
case S1AP_ProtocolIE_ID_id_S_TMSI:
S_TMSI = &ie->value.choice.S_TMSI;
break;
default:
break;
}
}
d_trace(5, " IP[%s] ENB_ID[%d]\n",
CORE_ADDR(enb->addr, buf), enb->enb_id);
d_assert(ENB_UE_S1AP_ID, return,);
enb_ue = enb_ue_find_by_enb_ue_s1ap_id(enb, *ENB_UE_S1AP_ID);
if (!enb_ue)
{
enb_ue = enb_ue_add(enb);
d_assert(enb_ue, return, "Null param");
enb_ue->enb_ue_s1ap_id = *ENB_UE_S1AP_ID;
/* Find MME_UE if S_TMSI included */
if (S_TMSI)
{
served_gummei_t *served_gummei = &mme_self()->served_gummei[0];
guti_t guti;
mme_ue_t *mme_ue = NULL;
memset(&guti, 0, sizeof(guti_t));
/* Use the first configured plmn_id and mme group id */
memcpy(&guti.plmn_id, &served_gummei->plmn_id[0], PLMN_ID_LEN);
guti.mme_gid = served_gummei->mme_gid[0];
/* size must be 1 */
memcpy(&guti.mme_code, S_TMSI->mMEC.buf, S_TMSI->mMEC.size);
/* size must be 4 */
memcpy(&guti.m_tmsi, S_TMSI->m_TMSI.buf, S_TMSI->m_TMSI.size);
guti.m_tmsi = ntohl(guti.m_tmsi);
mme_ue = mme_ue_find_by_guti(&guti);
if (!mme_ue)
{
d_warn("Unknown UE by S_TMSI[G:%d,C:%d,M_TMSI:0x%x]",
guti.mme_gid, guti.mme_code, guti.m_tmsi);
}
else
{
d_trace(5, " S_TMSI[G:%d,C:%d,M_TMSI:0x%x] IMSI:[%s]\n",
mme_ue->guti.mme_gid,
mme_ue->guti.mme_code,
mme_ue->guti.m_tmsi,
MME_UE_HAVE_IMSI(mme_ue)
? mme_ue->imsi_bcd : "Unknown");
/* If NAS(mme_ue_t) has already been associated with
* older S1(enb_ue_t) context */
if (ECM_CONNECTED(mme_ue))
{
#if IMPLICIT_S1_RELEASE
/* Implcit S1 release */
d_warn("Implicit S1 release");
d_warn(" ENB_UE_S1AP_ID[%d] MME_UE_S1AP_ID[%d]",
mme_ue->enb_ue->enb_ue_s1ap_id,
mme_ue->enb_ue->mme_ue_s1ap_id);
rv = enb_ue_remove(mme_ue->enb_ue);
d_assert(rv == CORE_OK,,);
#else /* S1_HOLDING_TIMER */
/* Previous S1(enb_ue_t) context the holding timer(30secs)
* is started.
* Newly associated S1(enb_ue_t) context holding timer
* is stopped. */
d_trace(5, "Start S1 Holding Timer\n");
d_trace(5, " ENB_UE_S1AP_ID[%d] MME_UE_S1AP_ID[%d]\n",
mme_ue->enb_ue->enb_ue_s1ap_id,
mme_ue->enb_ue->mme_ue_s1ap_id);
/* De-associate S1 with NAS/EMM */
rv = enb_ue_deassociate(mme_ue->enb_ue);
d_assert(rv == CORE_OK,,);
tm_start(mme_ue->enb_ue->holding_timer);
#endif
}
tm_stop(enb_ue->holding_timer);
mme_ue_associate_enb_ue(mme_ue, enb_ue);
}
}
}
d_assert(TAI, return,);
pLMNidentity = &TAI->pLMNidentity;
d_assert(pLMNidentity && pLMNidentity->size == sizeof(plmn_id_t), return,);
tAC = &TAI->tAC;
d_assert(tAC && tAC->size == sizeof(c_uint16_t), return,);
memcpy(&enb_ue->nas.tai.plmn_id, pLMNidentity->buf,
sizeof(enb_ue->nas.tai.plmn_id));
memcpy(&enb_ue->nas.tai.tac, tAC->buf, sizeof(enb_ue->nas.tai.tac));
enb_ue->nas.tai.tac = ntohs(enb_ue->nas.tai.tac);
d_assert(EUTRAN_CGI, return,);
pLMNidentity = &EUTRAN_CGI->pLMNidentity;
d_assert(pLMNidentity && pLMNidentity->size == sizeof(plmn_id_t), return,);
cell_ID = &EUTRAN_CGI->cell_ID;
d_assert(cell_ID, return,);
memcpy(&enb_ue->nas.e_cgi.plmn_id, pLMNidentity->buf,
sizeof(enb_ue->nas.e_cgi.plmn_id));
memcpy(&enb_ue->nas.e_cgi.cell_id, cell_ID->buf,
sizeof(enb_ue->nas.e_cgi.cell_id));
enb_ue->nas.e_cgi.cell_id = (ntohl(enb_ue->nas.e_cgi.cell_id) >> 4);
d_trace(5, " ENB_UE_S1AP_ID[%d] MME_UE_S1AP_ID[%d] TAC[%d]\n",
enb_ue->enb_ue_s1ap_id, enb_ue->mme_ue_s1ap_id, enb_ue->nas.tai.tac);
d_assert(s1ap_send_to_nas(enb_ue,
S1AP_ProcedureCode_id_initialUEMessage, NAS_PDU) == CORE_OK,,
"s1ap_send_to_nas failed");
}
void s1ap_handle_uplink_nas_transport(
mme_enb_t *enb, s1ap_message_t *message)
{
char buf[CORE_ADDRSTRLEN];
int i;
S1AP_InitiatingMessage_t *initiatingMessage = NULL;
S1AP_UplinkNASTransport_t *UplinkNASTransport = NULL;
S1AP_UplinkNASTransport_IEs_t *ie = NULL;
S1AP_ENB_UE_S1AP_ID_t *ENB_UE_S1AP_ID = NULL;
S1AP_NAS_PDU_t *NAS_PDU = NULL;
enb_ue_t *enb_ue = NULL;
d_assert(enb, return,);
d_assert(enb->sock, return,);
d_assert(message, return,);
initiatingMessage = message->choice.initiatingMessage;
d_assert(initiatingMessage, return,);
UplinkNASTransport = &initiatingMessage->value.choice.UplinkNASTransport;
d_assert(UplinkNASTransport, return,);
d_trace(3, "[MME] Uplink NAS transport\n");
for (i = 0; i < UplinkNASTransport->protocolIEs.list.count; i++)
{
ie = UplinkNASTransport->protocolIEs.list.array[i];
switch(ie->id)
{
case S1AP_ProtocolIE_ID_id_eNB_UE_S1AP_ID:
ENB_UE_S1AP_ID = &ie->value.choice.ENB_UE_S1AP_ID;
break;
case S1AP_ProtocolIE_ID_id_NAS_PDU:
NAS_PDU = &ie->value.choice.NAS_PDU;
break;
default:
break;
}
}
d_trace(5, " IP[%s] ENB_ID[%d]\n",
CORE_ADDR(enb->addr, buf), enb->enb_id);
d_assert(ENB_UE_S1AP_ID, return,);
enb_ue = enb_ue_find_by_enb_ue_s1ap_id(enb, *ENB_UE_S1AP_ID);
d_assert(enb_ue, return, "No UE Context[ENB_UE_S1AP_ID:%d]",
*ENB_UE_S1AP_ID);
d_trace(5, " ENB_UE_S1AP_ID[%d] MME_UE_S1AP_ID[%d]\n",
enb_ue->enb_ue_s1ap_id, enb_ue->mme_ue_s1ap_id);
d_assert(s1ap_send_to_nas(enb_ue,
S1AP_ProcedureCode_id_uplinkNASTransport, NAS_PDU) == CORE_OK,,
"s1ap_send_to_nas failed");
}
void s1ap_handle_ue_capability_info_indication(
mme_enb_t *enb, s1ap_message_t *message)
{
char buf[CORE_ADDRSTRLEN];
int i;
S1AP_InitiatingMessage_t *initiatingMessage = NULL;
S1AP_UECapabilityInfoIndication_t *UECapabilityInfoIndication = NULL;
S1AP_UECapabilityInfoIndicationIEs_t *ie = NULL;
S1AP_ENB_UE_S1AP_ID_t *ENB_UE_S1AP_ID = NULL;
S1AP_UERadioCapability_t *UERadioCapability = NULL;
enb_ue_t *enb_ue = NULL;
d_assert(enb, return,);
d_assert(enb->sock, return,);
d_assert(message, return,);
initiatingMessage = message->choice.initiatingMessage;
d_assert(initiatingMessage, return,);
UECapabilityInfoIndication =
&initiatingMessage->value.choice.UECapabilityInfoIndication;
d_assert(UECapabilityInfoIndication, return,);
d_trace(3, "[MME] UE capability info indication\n");
for (i = 0; i < UECapabilityInfoIndication->protocolIEs.list.count; i++)
{
ie = UECapabilityInfoIndication->protocolIEs.list.array[i];
switch(ie->id)
{
case S1AP_ProtocolIE_ID_id_eNB_UE_S1AP_ID:
ENB_UE_S1AP_ID = &ie->value.choice.ENB_UE_S1AP_ID;
break;
case S1AP_ProtocolIE_ID_id_UERadioCapability:
UERadioCapability = &ie->value.choice.UERadioCapability;
break;
default:
break;
}
}
d_trace(5, " IP[%s] ENB_ID[%d]\n",
CORE_ADDR(enb->addr, buf), enb->enb_id);
d_assert(ENB_UE_S1AP_ID, return,);
enb_ue = enb_ue_find_by_enb_ue_s1ap_id(enb, *ENB_UE_S1AP_ID);
d_assert(enb_ue, return, "No UE Context[%d]", *ENB_UE_S1AP_ID);
d_trace(5, " ENB_UE_S1AP_ID[%d] MME_UE_S1AP_ID[%d]\n",
enb_ue->enb_ue_s1ap_id, enb_ue->mme_ue_s1ap_id);
if (enb_ue->mme_ue)
{
S1AP_UERadioCapability_t *radio_capa = NULL;
mme_ue_t *mme_ue = enb_ue->mme_ue;
/* Release the previous one */
if (mme_ue->radio_capa)
{
radio_capa = (S1AP_UERadioCapability_t *)mme_ue->radio_capa;
if (radio_capa->buf)
CORE_FREE(radio_capa->buf);
CORE_FREE(mme_ue->radio_capa);
}
/* Save UE radio capability */
mme_ue->radio_capa = core_calloc(1, sizeof(S1AP_UERadioCapability_t));
radio_capa = (S1AP_UERadioCapability_t *)mme_ue->radio_capa;
d_assert(radio_capa, return,);
d_assert(UERadioCapability, return,);
radio_capa->size = UERadioCapability->size;
radio_capa->buf = core_calloc(radio_capa->size, sizeof(c_uint8_t));
d_assert(radio_capa->buf, return, "core_calloc error(size=%d)",
radio_capa->size);
memcpy(radio_capa->buf, UERadioCapability->buf, radio_capa->size);
}
}
void s1ap_handle_initial_context_setup_response(
mme_enb_t *enb, s1ap_message_t *message)
{
status_t rv;
char buf[CORE_ADDRSTRLEN];
int i;
S1AP_SuccessfulOutcome_t *successfulOutcome = NULL;
S1AP_InitialContextSetupResponse_t *InitialContextSetupResponse = NULL;
S1AP_InitialContextSetupResponseIEs_t *ie = NULL;
S1AP_ENB_UE_S1AP_ID_t *ENB_UE_S1AP_ID = NULL;
S1AP_E_RABSetupListCtxtSURes_t *E_RABSetupListCtxtSURes = NULL;
mme_ue_t *mme_ue = NULL;
enb_ue_t *enb_ue = NULL;
d_assert(enb, return,);
d_assert(enb->sock, return,);
d_assert(message, return,);
successfulOutcome = message->choice.successfulOutcome;
d_assert(successfulOutcome, return,);
InitialContextSetupResponse =
&successfulOutcome->value.choice.InitialContextSetupResponse;
d_assert(InitialContextSetupResponse, return,);
d_trace(3, "[MME] Initial context setup response\n");
for (i = 0; i < InitialContextSetupResponse->protocolIEs.list.count; i++)
{
ie = InitialContextSetupResponse->protocolIEs.list.array[i];
switch(ie->id)
{
case S1AP_ProtocolIE_ID_id_eNB_UE_S1AP_ID:
ENB_UE_S1AP_ID = &ie->value.choice.ENB_UE_S1AP_ID;
break;
case S1AP_ProtocolIE_ID_id_E_RABSetupListCtxtSURes:
E_RABSetupListCtxtSURes =
&ie->value.choice.E_RABSetupListCtxtSURes;
break;
default:
break;
}
}
d_trace(5, " IP[%s] ENB_ID[%d]\n",
CORE_ADDR(enb->addr, buf), enb->enb_id);
d_assert(ENB_UE_S1AP_ID, return,);
enb_ue = enb_ue_find_by_enb_ue_s1ap_id(enb, *ENB_UE_S1AP_ID);
d_assert(enb_ue, return, "No UE Context[%d]", *ENB_UE_S1AP_ID);
mme_ue = enb_ue->mme_ue;
d_assert(mme_ue, return,);
d_trace(5, " ENB_UE_S1AP_ID[%d] MME_UE_S1AP_ID[%d]\n",
enb_ue->enb_ue_s1ap_id, enb_ue->mme_ue_s1ap_id);
for (i = 0; i < E_RABSetupListCtxtSURes->list.count; i++)
{
S1AP_E_RABSetupItemCtxtSUResIEs_t *item = NULL;
S1AP_E_RABSetupItemCtxtSURes_t *e_rab = NULL;
mme_sess_t *sess = NULL;
mme_bearer_t *bearer = NULL;
item = (S1AP_E_RABSetupItemCtxtSUResIEs_t *)
E_RABSetupListCtxtSURes->list.array[i];
d_assert(item, return,);
e_rab = &item->value.choice.E_RABSetupItemCtxtSURes;
d_assert(e_rab, return, "Null param");
sess = mme_sess_find_by_ebi(mme_ue, e_rab->e_RAB_ID);
d_assert(sess, return, "Null param");
bearer = mme_default_bearer_in_sess(sess);
d_assert(bearer, return, "Null param");
memcpy(&bearer->enb_s1u_teid, e_rab->gTP_TEID.buf,
sizeof(bearer->enb_s1u_teid));
bearer->enb_s1u_teid = ntohl(bearer->enb_s1u_teid);
rv = s1ap_BIT_STRING_to_ip(
&e_rab->transportLayerAddress, &bearer->enb_s1u_ip);
d_assert(rv == CORE_OK, return,);
d_trace(5, " EBI[%d] ENB-S1U-TEID[%d]\n",
bearer->ebi, bearer->enb_s1u_teid);
if (FSM_CHECK(&bearer->sm, esm_state_active))
{
d_trace(5, " NAS_EPS Type[%d]\n", mme_ue->nas_eps.type);
int uli_presence = 0;
if (mme_ue->nas_eps.type != MME_EPS_TYPE_ATTACH_REQUEST)
{
d_trace(5, " ### ULI PRESENT ###\n");
uli_presence = 1;
}
rv = mme_gtp_send_modify_bearer_request(bearer, uli_presence);
d_assert(rv == CORE_OK, return, "gtp send failed");
}
}
}
void s1ap_handle_initial_context_setup_failure(
mme_enb_t *enb, s1ap_message_t *message)
{
status_t rv;
char buf[CORE_ADDRSTRLEN];
int i;
S1AP_UnsuccessfulOutcome_t *unsuccessfulOutcome = NULL;
S1AP_InitialContextSetupFailure_t *InitialContextSetupFailure = NULL;
S1AP_InitialContextSetupFailureIEs_t *ie = NULL;
S1AP_ENB_UE_S1AP_ID_t *ENB_UE_S1AP_ID = NULL;
S1AP_Cause_t *Cause = NULL;
mme_ue_t *mme_ue = NULL;
enb_ue_t *enb_ue = NULL;
d_assert(enb, return,);
d_assert(enb->sock, return,);
d_assert(message, return,);
unsuccessfulOutcome = message->choice.unsuccessfulOutcome;
d_assert(unsuccessfulOutcome, return,);
InitialContextSetupFailure =
&unsuccessfulOutcome->value.choice.InitialContextSetupFailure;
d_assert(InitialContextSetupFailure, return,);
d_trace(3, "[MME] Initial context setup failure\n");
for (i = 0; i < InitialContextSetupFailure->protocolIEs.list.count; i++)
{
ie = InitialContextSetupFailure->protocolIEs.list.array[i];
switch(ie->id)
{
case S1AP_ProtocolIE_ID_id_eNB_UE_S1AP_ID:
ENB_UE_S1AP_ID = &ie->value.choice.ENB_UE_S1AP_ID;
break;
case S1AP_ProtocolIE_ID_id_Cause:
Cause = &ie->value.choice.Cause;
break;
default:
break;
}
}
d_trace(5, " IP[%s] ENB_ID[%d]\n",
CORE_ADDR(enb->addr, buf), enb->enb_id);
d_assert(ENB_UE_S1AP_ID, return,);
d_assert(Cause, return,);
enb_ue = enb_ue_find_by_enb_ue_s1ap_id(enb, *ENB_UE_S1AP_ID);
d_assert(enb_ue, return, "No UE Context[%d]", *ENB_UE_S1AP_ID);
mme_ue = enb_ue->mme_ue;
d_trace(5, " ENB_UE_S1AP_ID[%d] MME_UE_S1AP_ID[%d]\n",
enb_ue->enb_ue_s1ap_id, enb_ue->mme_ue_s1ap_id);
d_trace(5, " Cause[Group:%d Cause:%d]\n",
Cause->present, Cause->choice.radioNetwork);
d_assert(mme_ue,,);
if (mme_ue && FSM_CHECK(&mme_ue->sm, emm_state_registered))
{
d_trace(5, " EMM-Registered\n");
/*
* 19.2.2.3 in Spec 36.300
*
* In case of failure, eNB and MME behaviours are not mandated.
*
* Both implicit release (local release at each node) and
* explicit release (MME-initiated UE Context Release procedure)
* may in principle be adopted. The eNB should ensure
* that no hanging resources remain at the eNB.
*/
#if 0 /* NOTHING TO DO */
#if 0 /* FIXME : Does it needed? */
rv = nas_send_service_reject(mme_ue,
EMM_CAUSE_PROTOCOL_ERROR_UNSPECIFIED);
d_assert(rv == CORE_OK,,
"nas_send_service_reject() failed");
#endif
#if 1 /* Explicit Release */
d_trace(5, " Explicit Release\n");
rv = s1ap_send_ue_context_release_command(enb_ue,
S1AP_Cause_PR_nas,
#if 1 /* NAS Cause: Normal Relase */
S1AP_CauseNas_normal_release,
#else /* NAS Cause : Detach */
S1AP_CauseNas_detach,
#endif
S1AP_UE_CTX_REL_UNLINK_MME_UE_CONTEXT, 0);
d_assert(rv == CORE_OK,, "s1ap send error");
#else /* Implicit Release */
d_trace(5, " Implicit Release\n");
rv = enb_ue_remove(enb_ue);
d_assert(rv == CORE_OK,, "enb_ue_remove() failed");
rv = mme_ue_deassociate(mme_ue);
d_assert(rv == CORE_OK,, "mme_ue_deassociate() failed");
#endif
#endif
}
else
{
d_trace(5, " NOT EMM-Registered\n");
d_assert(mme_ue,,);
rv = mme_send_delete_session_or_ue_context_release(mme_ue, enb_ue);
d_assert(rv == CORE_OK,,
"mme_send_delete_session_or_ue_context_release() failed");
}
}
void s1ap_handle_e_rab_setup_response(
mme_enb_t *enb, s1ap_message_t *message)
{
status_t rv;
char buf[CORE_ADDRSTRLEN];
int i;
S1AP_SuccessfulOutcome_t *successfulOutcome = NULL;
S1AP_E_RABSetupResponse_t *E_RABSetupResponse = NULL;
S1AP_E_RABSetupResponseIEs_t *ie = NULL;
S1AP_ENB_UE_S1AP_ID_t *ENB_UE_S1AP_ID = NULL;
S1AP_E_RABSetupListBearerSURes_t *E_RABSetupListBearerSURes = NULL;
enb_ue_t *enb_ue = NULL;
mme_ue_t *mme_ue = NULL;
d_assert(enb, return,);
d_assert(enb->sock, return,);
d_assert(message, return,);
successfulOutcome = message->choice.successfulOutcome;
d_assert(successfulOutcome, return,);
E_RABSetupResponse = &successfulOutcome->value.choice.E_RABSetupResponse;
d_assert(E_RABSetupResponse, return,);
d_trace(3, "[MME] E-RAB setup response\n");
for (i = 0; i < E_RABSetupResponse->protocolIEs.list.count; i++)
{
ie = E_RABSetupResponse->protocolIEs.list.array[i];
switch(ie->id)
{
case S1AP_ProtocolIE_ID_id_eNB_UE_S1AP_ID:
ENB_UE_S1AP_ID = &ie->value.choice.ENB_UE_S1AP_ID;
break;
case S1AP_ProtocolIE_ID_id_E_RABSetupListBearerSURes:
E_RABSetupListBearerSURes =
&ie->value.choice.E_RABSetupListBearerSURes;
break;
default:
break;
}
}
d_trace(5, " IP[%s] ENB_ID[%d]\n",
CORE_ADDR(enb->addr, buf), enb->enb_id);
d_assert(ENB_UE_S1AP_ID, return,);
enb_ue = enb_ue_find_by_enb_ue_s1ap_id(enb, *ENB_UE_S1AP_ID);
d_assert(enb_ue, return, "No UE Context[%d]", *ENB_UE_S1AP_ID);
mme_ue = enb_ue->mme_ue;
d_assert(mme_ue, return,);
d_trace(5, " ENB_UE_S1AP_ID[%d] MME_UE_S1AP_ID[%d]\n",
enb_ue->enb_ue_s1ap_id, enb_ue->mme_ue_s1ap_id);
for (i = 0; i < E_RABSetupListBearerSURes->list.count; i++)
{
S1AP_E_RABSetupItemBearerSUResIEs_t *item = NULL;
S1AP_E_RABSetupItemBearerSURes_t *e_rab = NULL;
mme_bearer_t *bearer = NULL;
item = (S1AP_E_RABSetupItemBearerSUResIEs_t *)
E_RABSetupListBearerSURes->list.array[i];
d_assert(item, return,);
e_rab = &item->value.choice.E_RABSetupItemBearerSURes;
d_assert(e_rab, return, "Null param");
bearer = mme_bearer_find_by_ue_ebi(mme_ue, e_rab->e_RAB_ID);
d_assert(bearer, return, "Null param");
memcpy(&bearer->enb_s1u_teid, e_rab->gTP_TEID.buf,
sizeof(bearer->enb_s1u_teid));
bearer->enb_s1u_teid = ntohl(bearer->enb_s1u_teid);
rv = s1ap_BIT_STRING_to_ip(
&e_rab->transportLayerAddress, &bearer->enb_s1u_ip);
d_assert(rv == CORE_OK, return,);
d_trace(5, " EBI[%d]\n", bearer->ebi);
if (FSM_CHECK(&bearer->sm, esm_state_active))
{
status_t rv;
mme_bearer_t *linked_bearer = mme_linked_bearer(bearer);
d_assert(linked_bearer, return, "Null param");
d_trace(5, " Linked-EBI[%d]\n", linked_bearer->ebi);
if (bearer->ebi == linked_bearer->ebi)
{
rv = mme_gtp_send_modify_bearer_request(bearer, 0);
d_assert(rv == CORE_OK, return, "gtp send failed");
}
else
{
rv = mme_gtp_send_create_bearer_response(bearer);
d_assert(rv == CORE_OK, return, "gtp send failed");
}
}
}
}
void s1ap_handle_ue_context_release_request(
mme_enb_t *enb, s1ap_message_t *message)
{
status_t rv;
char buf[CORE_ADDRSTRLEN];
int i;
S1AP_InitiatingMessage_t *initiatingMessage = NULL;
S1AP_UEContextReleaseRequest_t *UEContextReleaseRequest = NULL;
S1AP_UEContextReleaseRequest_IEs_t *ie = NULL;
S1AP_MME_UE_S1AP_ID_t *MME_UE_S1AP_ID = NULL;
S1AP_ENB_UE_S1AP_ID_t *ENB_UE_S1AP_ID = NULL;
S1AP_Cause_t *Cause = NULL;
enb_ue_t *enb_ue = NULL;
mme_ue_t *mme_ue = NULL;
d_assert(enb, return,);
d_assert(enb->sock, return,);
d_assert(message, return,);
initiatingMessage = message->choice.initiatingMessage;
d_assert(initiatingMessage, return,);
UEContextReleaseRequest =
&initiatingMessage->value.choice.UEContextReleaseRequest;
d_assert(UEContextReleaseRequest, return,);
d_trace(3, "[MME] UE Context release request\n");
for (i = 0; i < UEContextReleaseRequest->protocolIEs.list.count; i++)
{
ie = UEContextReleaseRequest->protocolIEs.list.array[i];
switch(ie->id)
{
case S1AP_ProtocolIE_ID_id_MME_UE_S1AP_ID:
MME_UE_S1AP_ID = &ie->value.choice.MME_UE_S1AP_ID;
break;
case S1AP_ProtocolIE_ID_id_eNB_UE_S1AP_ID:
ENB_UE_S1AP_ID = &ie->value.choice.ENB_UE_S1AP_ID;
break;
case S1AP_ProtocolIE_ID_id_Cause:
Cause = &ie->value.choice.Cause;
break;
default:
break;
}
}
d_trace(5, " IP[%s] ENB_ID[%d]\n",
CORE_ADDR(enb->addr, buf), enb->enb_id);
d_assert(MME_UE_S1AP_ID, return,);
enb_ue = enb_ue_find_by_mme_ue_s1ap_id(*MME_UE_S1AP_ID);
if (!enb_ue)
{
d_warn("No ENB UE Context : MME_UE_S1AP_ID[%d]", *MME_UE_S1AP_ID);
rv = s1ap_send_error_indication(enb,
MME_UE_S1AP_ID, ENB_UE_S1AP_ID, Cause);
d_assert(rv == CORE_OK, return, "s1ap send error");
return;
}
d_trace(5, " ENB_UE_S1AP_ID[%d] MME_UE_S1AP_ID[%d]\n",
enb_ue->enb_ue_s1ap_id, enb_ue->mme_ue_s1ap_id);
d_assert(Cause, return,);
d_trace(5, " Cause[Group:%d Cause:%d]\n",
Cause->present, Cause->choice.radioNetwork);
switch(Cause->present)
{
case S1AP_Cause_PR_radioNetwork:
case S1AP_Cause_PR_transport:
case S1AP_Cause_PR_protocol:
case S1AP_Cause_PR_misc:
break;
case S1AP_Cause_PR_nas:
d_warn("NAS-Cause[%d]", Cause->choice.nas);
default:
d_warn("Invalid cause group[%d]", Cause->present);
break;
}
mme_ue = enb_ue->mme_ue;
if (mme_ue)
{
if (FSM_CHECK(&mme_ue->sm, emm_state_registered))
{
d_trace(5, " EMM-Registered\n");
rv = mme_send_release_access_bearer_or_ue_context_release(
mme_ue, enb_ue);
d_assert(rv == CORE_OK,, "mme_send_release_access_bearer_or_"
"ue_context_release() failed");
}
else
{
d_trace(5, " NOT EMM-Registered\n");
rv = mme_send_delete_session_or_ue_context_release(mme_ue, enb_ue);
d_assert(rv == CORE_OK,,
"mme_send_delete_session_or_ue_context_release() failed");
}
}
else
{
d_trace(5, " S1 Context Not Associated\n");
rv = s1ap_send_ue_context_release_command(enb_ue,
S1AP_Cause_PR_nas, S1AP_CauseNas_normal_release,
S1AP_UE_CTX_REL_NO_ACTION, 0);
d_assert(rv == CORE_OK,, "s1ap send error");
}
}
void s1ap_handle_ue_context_release_complete(
mme_enb_t *enb, s1ap_message_t *message)
{
status_t rv;
char buf[CORE_ADDRSTRLEN];
int i;
S1AP_SuccessfulOutcome_t *successfulOutcome = NULL;
S1AP_UEContextReleaseComplete_t *UEContextReleaseComplete = NULL;
S1AP_UEContextReleaseComplete_IEs_t *ie = NULL;
S1AP_MME_UE_S1AP_ID_t *MME_UE_S1AP_ID = NULL;
mme_ue_t *mme_ue = NULL;
enb_ue_t *enb_ue = NULL;
d_assert(enb, return,);
d_assert(enb->sock, return,);
d_assert(message, return,);
successfulOutcome = message->choice.successfulOutcome;
d_assert(successfulOutcome, return,);
UEContextReleaseComplete =
&successfulOutcome->value.choice.UEContextReleaseComplete;
d_assert(UEContextReleaseComplete, return,);
d_trace(3, "[MME] UE Context release complete\n");
for (i = 0; i < UEContextReleaseComplete->protocolIEs.list.count; i++)
{
ie = UEContextReleaseComplete->protocolIEs.list.array[i];
switch(ie->id)
{
case S1AP_ProtocolIE_ID_id_MME_UE_S1AP_ID:
MME_UE_S1AP_ID = &ie->value.choice.MME_UE_S1AP_ID;
break;
default:
break;
}
}
d_trace(5, " IP[%s] ENB_ID[%d]\n",
CORE_ADDR(enb->addr, buf), enb->enb_id);
d_assert(MME_UE_S1AP_ID, return,);
enb_ue = enb_ue_find_by_mme_ue_s1ap_id(*MME_UE_S1AP_ID);
d_assert(enb_ue, return, "No UE Context[%d]", *MME_UE_S1AP_ID);
mme_ue = enb_ue->mme_ue;
d_trace(5, " ENB_UE_S1AP_ID[%d] MME_UE_S1AP_ID[%d]\n",
enb_ue->enb_ue_s1ap_id, enb_ue->mme_ue_s1ap_id);
switch (enb_ue->ue_ctx_rel_action)
{
case S1AP_UE_CTX_REL_NO_ACTION:
{
d_trace(5, " No Action\n");
rv = enb_ue_remove(enb_ue);
d_assert(rv == CORE_OK,, "enb_ue_remove() failed");
break;
}
case S1AP_UE_CTX_REL_S1_NORMAL_RELEASE:
{
d_trace(5, " Action: S1 normal release\n");
rv = enb_ue_remove(enb_ue);
d_assert(rv == CORE_OK,, "enb_ue_remove() failed");
d_assert(mme_ue,,);
rv = mme_ue_deassociate(mme_ue);
d_assert(rv == CORE_OK,, "mme_ue_deassociate() failed");
break;
}
case S1AP_UE_CTX_REL_UE_CONTEXT_REMOVE:
{
d_trace(5, " Action: UE context remove()\n");
rv = enb_ue_remove(enb_ue);
d_assert(rv == CORE_OK,, "enb_ue_removeI() failed");
d_assert(mme_ue,,);
rv = mme_ue_remove(mme_ue);
d_assert(rv == CORE_OK,, "mme_ue_remove() failed");
break;
}
case S1AP_UE_CTX_REL_DELETE_INDIRECT_TUNNEL:
{
d_trace(5, " Action: Delete indirect tunnel\n");
rv = source_ue_deassociate_target_ue(enb_ue);
d_assert(rv == CORE_OK,,
"source_ue_deassociate_target_ue() failed");
rv = enb_ue_remove(enb_ue);
d_assert(rv == CORE_OK,, "enb_ue_removeI() failed");
d_assert(mme_ue,,);
if (mme_ue_have_indirect_tunnel(mme_ue))
{
rv = mme_gtp_send_delete_indirect_data_forwarding_tunnel_request(mme_ue);
d_assert(rv == CORE_OK,, "mme_gtp_send_delete_indirect_data_"
"forwarding_tunnel_request() failed");
}
else
{
d_warn("Check your eNodeB");
d_warn(" There is no INDIRECT TUNNEL");
d_warn(" Packet could be dropped during S1-Handover");
rv = mme_ue_clear_indirect_tunnel(mme_ue);
d_assert(rv == CORE_OK,,
"mme_ue_clear_indirect_tunnel() failed");
}
break;
}
default:
{
d_assert(0,, "Invalid Action[%d]", enb_ue->ue_ctx_rel_action);
break;
}
}
}
void s1ap_handle_paging(mme_ue_t *mme_ue)
{
pkbuf_t *s1apbuf = NULL;
hash_index_t *hi = NULL;
mme_enb_t *enb = NULL;
int i;
status_t rv;
/* Find enB with matched TAI */
for (hi = mme_enb_first(); hi; hi = mme_enb_next(hi))
{
enb = mme_enb_this(hi);
for (i = 0; i < enb->num_of_supported_ta_list; i++)
{
if (!memcmp(&enb->supported_ta_list[i],
&mme_ue->tai, sizeof(tai_t)))
{
if (mme_ue->last_paging_msg)
s1apbuf = mme_ue->last_paging_msg;
else
{
/* Buidl S1Ap Paging message */
rv = s1ap_build_paging(&s1apbuf, mme_ue);
d_assert(rv == CORE_OK && s1apbuf, return,
"s1ap build error");
/* Save it for later use */
mme_ue->last_paging_msg = pkbuf_copy(s1apbuf);
}
/* Send to enb */
d_assert(s1ap_send_to_enb(enb, s1apbuf) == CORE_OK, return,
"s1ap send error");
}
}
}
}
void s1ap_handle_path_switch_request(
mme_enb_t *enb, s1ap_message_t *message)
{
status_t rv;
char buf[CORE_ADDRSTRLEN];
int i;
S1AP_InitiatingMessage_t *initiatingMessage = NULL;
S1AP_PathSwitchRequest_t *PathSwitchRequest = NULL;
S1AP_PathSwitchRequestIEs_t *ie = NULL;
S1AP_ENB_UE_S1AP_ID_t *ENB_UE_S1AP_ID = NULL;
S1AP_E_RABToBeSwitchedDLList_t *E_RABToBeSwitchedDLList = NULL;
S1AP_MME_UE_S1AP_ID_t *MME_UE_S1AP_ID = NULL;
S1AP_EUTRAN_CGI_t *EUTRAN_CGI = NULL;
S1AP_TAI_t *TAI = NULL;
S1AP_UESecurityCapabilities_t *UESecurityCapabilities = NULL;
S1AP_PLMNidentity_t *pLMNidentity = NULL;
S1AP_CellIdentity_t *cell_ID = NULL;
S1AP_TAC_t *tAC = NULL;
S1AP_EncryptionAlgorithms_t *encryptionAlgorithms = NULL;
S1AP_IntegrityProtectionAlgorithms_t *integrityProtectionAlgorithms = NULL;
c_uint16_t eea = 0, eia = 0;
enb_ue_t *enb_ue = NULL;
mme_ue_t *mme_ue = NULL;
d_assert(enb, return,);
d_assert(enb->sock, return,);
d_assert(message, return,);
initiatingMessage = message->choice.initiatingMessage;
d_assert(initiatingMessage, return,);
PathSwitchRequest = &initiatingMessage->value.choice.PathSwitchRequest;
d_assert(PathSwitchRequest, return,);
d_trace(3, "[MME] Path switch request\n");
for (i = 0; i < PathSwitchRequest->protocolIEs.list.count; i++)
{
ie = PathSwitchRequest->protocolIEs.list.array[i];
switch(ie->id)
{
case S1AP_ProtocolIE_ID_id_eNB_UE_S1AP_ID:
ENB_UE_S1AP_ID = &ie->value.choice.ENB_UE_S1AP_ID;
break;
case S1AP_ProtocolIE_ID_id_E_RABToBeSwitchedDLList:
E_RABToBeSwitchedDLList =
&ie->value.choice.E_RABToBeSwitchedDLList;
break;
case S1AP_ProtocolIE_ID_id_SourceMME_UE_S1AP_ID:
MME_UE_S1AP_ID = &ie->value.choice.MME_UE_S1AP_ID;
break;
case S1AP_ProtocolIE_ID_id_EUTRAN_CGI:
EUTRAN_CGI = &ie->value.choice.EUTRAN_CGI;
break;
case S1AP_ProtocolIE_ID_id_TAI:
TAI = &ie->value.choice.TAI;
break;
case S1AP_ProtocolIE_ID_id_UESecurityCapabilities:
UESecurityCapabilities = &ie->value.choice.UESecurityCapabilities;
break;
default:
break;
}
}
d_trace(5, " IP[%s] ENB_ID[%d]\n",
CORE_ADDR(enb->addr, buf), enb->enb_id);
d_assert(EUTRAN_CGI, return,);
pLMNidentity = &EUTRAN_CGI->pLMNidentity;
d_assert(pLMNidentity && pLMNidentity->size == sizeof(plmn_id_t), return,);
cell_ID = &EUTRAN_CGI->cell_ID;
d_assert(cell_ID, return,);
d_assert(TAI, return,);
pLMNidentity = &TAI->pLMNidentity;
d_assert(pLMNidentity && pLMNidentity->size == sizeof(plmn_id_t), return,);
tAC = &TAI->tAC;
d_assert(tAC && tAC->size == sizeof(c_uint16_t), return,);
d_assert(UESecurityCapabilities, return,);
encryptionAlgorithms =
&UESecurityCapabilities->encryptionAlgorithms;
integrityProtectionAlgorithms =
&UESecurityCapabilities->integrityProtectionAlgorithms;
d_assert(MME_UE_S1AP_ID, return,);
d_assert(ENB_UE_S1AP_ID, return,);
enb_ue = enb_ue_find_by_mme_ue_s1ap_id(*MME_UE_S1AP_ID);
if (!enb_ue)
{
d_error("Cannot find UE from sourceMME-UE-S1AP-ID[%d] and eNB[%s:%d]",
*MME_UE_S1AP_ID, CORE_ADDR(enb->addr, buf), enb->enb_id);
s1ap_send_path_switch_failure(enb,
*ENB_UE_S1AP_ID, *MME_UE_S1AP_ID,
S1AP_Cause_PR_radioNetwork,
S1AP_CauseRadioNetwork_unknown_mme_ue_s1ap_id);
return;
}
d_trace(5, " ENB_UE_S1AP_ID[%d] MME_UE_S1AP_ID[%d]\n",
enb_ue->enb_ue_s1ap_id, enb_ue->mme_ue_s1ap_id);
mme_ue = enb_ue->mme_ue;
d_assert(mme_ue, return, "Null param");
if (SECURITY_CONTEXT_IS_VALID(mme_ue))
{
mme_ue->nhcc++;
mme_kdf_nh(mme_ue->kasme, mme_ue->nh, mme_ue->nh);
}
else
{
s1ap_send_path_switch_failure(enb,
*ENB_UE_S1AP_ID, *MME_UE_S1AP_ID,
S1AP_Cause_PR_nas, S1AP_CauseNas_authentication_failure);
return;
}
enb_ue->enb_ue_s1ap_id = *ENB_UE_S1AP_ID;
memcpy(&enb_ue->nas.tai.plmn_id, pLMNidentity->buf,
sizeof(enb_ue->nas.tai.plmn_id));
memcpy(&enb_ue->nas.tai.tac, tAC->buf, sizeof(enb_ue->nas.tai.tac));
enb_ue->nas.tai.tac = ntohs(enb_ue->nas.tai.tac);
memcpy(&enb_ue->nas.e_cgi.plmn_id, pLMNidentity->buf,
sizeof(enb_ue->nas.e_cgi.plmn_id));
memcpy(&enb_ue->nas.e_cgi.cell_id, cell_ID->buf,
sizeof(enb_ue->nas.e_cgi.cell_id));
enb_ue->nas.e_cgi.cell_id = (ntohl(enb_ue->nas.e_cgi.cell_id) >> 4);
d_trace(5, " OLD TAI[PLMN_ID:0x%x,TAC:%d]\n",
mme_ue->tai.plmn_id, mme_ue->tai.tac);
d_trace(5, " OLD E_CGI[PLMN_ID:0x%x,CELL_ID:%d]\n",
mme_ue->e_cgi.plmn_id, mme_ue->e_cgi.cell_id);
d_trace(5, " TAI[PLMN_ID:0x%x,TAC:%d]\n",
enb_ue->nas.tai.plmn_id, enb_ue->nas.tai.tac);
d_trace(5, " E_CGI[PLMN_ID:0x%x,CELL_ID:%d]\n",
enb_ue->nas.e_cgi.plmn_id, enb_ue->nas.e_cgi.cell_id);
/* Copy TAI and ECGI from enb_ue */
memcpy(&mme_ue->tai, &enb_ue->nas.tai, sizeof(tai_t));
memcpy(&mme_ue->e_cgi, &enb_ue->nas.e_cgi, sizeof(e_cgi_t));
memcpy(&eea, encryptionAlgorithms->buf, sizeof(eea));
eea = ntohs(eea);
mme_ue->ue_network_capability.eea = eea >> 9;
mme_ue->ue_network_capability.eea0 = 1;
memcpy(&eia, integrityProtectionAlgorithms->buf, sizeof(eia));
eia = ntohs(eia);
mme_ue->ue_network_capability.eia = eia >> 9;
mme_ue->ue_network_capability.eia0 = 0;
d_assert(E_RABToBeSwitchedDLList, return,);
for (i = 0; i < E_RABToBeSwitchedDLList->list.count; i++)
{
S1AP_E_RABToBeSwitchedDLItemIEs_t *item = NULL;
S1AP_E_RABToBeSwitchedDLItem_t *e_rab = NULL;
mme_bearer_t *bearer = NULL;
item = (S1AP_E_RABToBeSwitchedDLItemIEs_t *)
E_RABToBeSwitchedDLList->list.array[i];
d_assert(item, return,);
e_rab = &item->value.choice.E_RABToBeSwitchedDLItem;
d_assert(e_rab, return, "Null param");
bearer = mme_bearer_find_by_ue_ebi(mme_ue, e_rab->e_RAB_ID);
d_assert(bearer, return, "Cannot find e_RAB_ID[%d]", e_rab->e_RAB_ID);
memcpy(&bearer->enb_s1u_teid, e_rab->gTP_TEID.buf,
sizeof(bearer->enb_s1u_teid));
bearer->enb_s1u_teid = ntohl(bearer->enb_s1u_teid);
rv = s1ap_BIT_STRING_to_ip(
&e_rab->transportLayerAddress, &bearer->enb_s1u_ip);
d_assert(rv == CORE_OK, return,);
GTP_COUNTER_INCREMENT(
mme_ue, GTP_COUNTER_MODIFY_BEARER_BY_PATH_SWITCH);
rv = mme_gtp_send_modify_bearer_request(bearer, 1);
d_assert(rv == CORE_OK, return, "gtp send failed");
}
/* Switch to enb */
enb_ue_switch_to_enb(enb_ue, enb);
}
#if 0
void s1ap_handle_handover_required(mme_enb_t *enb, s1ap_message_t *message)
{
status_t rv;
char buf[CORE_ADDRSTRLEN];
enb_ue_t *source_ue = NULL;
mme_ue_t *mme_ue = NULL;
S1AP_HandoverRequiredIEs_t *ies = NULL;
d_assert(enb, return,);
ies = &message->s1ap_HandoverRequiredIEs;
d_assert(ies, return,);
d_trace(3, "[MME] Handover required\n");
d_trace(5, " IP[%s] ENB_ID[%d]\n",
CORE_ADDR(enb->addr, buf), enb->enb_id);
source_ue = enb_ue_find_by_enb_ue_s1ap_id(enb, ies->eNB_UE_S1AP_ID);
d_assert(source_ue, return,
"Cannot find UE for eNB-UE-S1AP-ID[%d] and eNB[%s:%d]",
ies->eNB_UE_S1AP_ID,
CORE_ADDR(enb->addr, buf), enb->enb_id);
d_assert(source_ue->mme_ue_s1ap_id == ies->mme_ue_s1ap_id, return,
"Conflict MME-UE-S1AP-ID : %d != %d\n",
source_ue->mme_ue_s1ap_id, ies->mme_ue_s1ap_id);
d_trace(5, " Source : ENB_UE_S1AP_ID[%d] MME_UE_S1AP_ID[%d]\n",
source_ue->enb_ue_s1ap_id, source_ue->mme_ue_s1ap_id);
mme_ue = source_ue->mme_ue;
d_assert(mme_ue, return,);
if (SECURITY_CONTEXT_IS_VALID(mme_ue))
{
mme_ue->nhcc++;
mme_kdf_nh(mme_ue->kasme, mme_ue->nh, mme_ue->nh);
}
else
{
rv = s1ap_send_handover_preparation_failure(source_ue, &ies->cause);
d_assert(rv == CORE_OK, return, "s1ap send error");
return;
}
source_ue->handover_type = ies->handoverType;
rv = s1ap_send_handover_request(mme_ue, ies);
d_assert(rv == CORE_OK,, "s1ap send error");
}
void s1ap_handle_handover_request_ack(mme_enb_t *enb, s1ap_message_t *message)
{
status_t rv;
char buf[CORE_ADDRSTRLEN];
int i;
enb_ue_t *source_ue = NULL;
enb_ue_t *target_ue = NULL;
mme_ue_t *mme_ue = NULL;
S1AP_HandoverRequestAcknowledgeIEs_t *ies = NULL;
d_assert(enb, return,);
ies = &message->s1ap_HandoverRequestAcknowledgeIEs;
d_assert(ies, return,);
d_trace(3, "[MME] Handover request acknowledge\n");
d_trace(5, " IP[%s] ENB_ID[%d]\n",
CORE_ADDR(enb->addr, buf), enb->enb_id);
target_ue = enb_ue_find_by_mme_ue_s1ap_id(ies->mme_ue_s1ap_id);
d_assert(target_ue, return,
"Cannot find UE for MME-UE-S1AP-ID[%d] and eNB[%s:%d]",
ies->mme_ue_s1ap_id,
CORE_ADDR(enb->addr, buf), enb->enb_id);
target_ue->enb_ue_s1ap_id = ies->eNB_UE_S1AP_ID;
source_ue = target_ue->source_ue;
d_assert(source_ue, return,);
mme_ue = source_ue->mme_ue;
d_assert(mme_ue, return,);
d_trace(5, " Source : ENB_UE_S1AP_ID[%d] MME_UE_S1AP_ID[%d]\n",
source_ue->enb_ue_s1ap_id, source_ue->mme_ue_s1ap_id);
d_trace(5, " Target : ENB_UE_S1AP_ID[%d] MME_UE_S1AP_ID[%d]\n",
target_ue->enb_ue_s1ap_id, target_ue->mme_ue_s1ap_id);
for (i = 0; i < ies->e_RABAdmittedList.s1ap_E_RABAdmittedItem.count; i++)
{
mme_bearer_t *bearer = NULL;
S1AP_E_RABAdmittedItem_t *e_rab = NULL;
e_rab = (S1AP_E_RABAdmittedItem_t *)ies->e_RABAdmittedList.
s1ap_E_RABAdmittedItem.array[i];
d_assert(e_rab, return, "Null param");
bearer = mme_bearer_find_by_ue_ebi(mme_ue, e_rab->e_RAB_ID);
d_assert(bearer, return, "Null param");
memcpy(&bearer->target_s1u_teid, e_rab->gTP_TEID.buf,
sizeof(bearer->target_s1u_teid));
bearer->target_s1u_teid = ntohl(bearer->target_s1u_teid);
rv = s1ap_BIT_STRING_to_ip(
&e_rab->transportLayerAddress, &bearer->target_s1u_ip);
d_assert(rv == CORE_OK, return,);
if (e_rab->dL_transportLayerAddress && e_rab->dL_gTP_TEID)
{
d_assert(e_rab->dL_gTP_TEID->buf, return,);
d_assert(e_rab->dL_transportLayerAddress->buf, return,);
memcpy(&bearer->enb_dl_teid, e_rab->dL_gTP_TEID->buf,
sizeof(bearer->enb_dl_teid));
bearer->enb_dl_teid = ntohl(bearer->enb_dl_teid);
rv = s1ap_BIT_STRING_to_ip(
e_rab->dL_transportLayerAddress, &bearer->enb_dl_ip);
d_assert(rv == CORE_OK, return,);
}
if (e_rab->uL_S1AP_TransportLayerAddress && e_rab->uL_S1AP_GTP_TEID)
{
d_assert(e_rab->uL_S1AP_GTP_TEID->buf, return,);
d_assert(e_rab->uL_S1AP_TransportLayerAddress->buf, return,);
memcpy(&bearer->enb_ul_teid, e_rab->uL_S1AP_GTP_TEID->buf,
sizeof(bearer->enb_ul_teid));
bearer->enb_ul_teid = ntohl(bearer->enb_ul_teid);
rv = s1ap_BIT_STRING_to_ip(
e_rab->uL_S1AP_TransportLayerAddress, &bearer->enb_ul_ip);
d_assert(rv == CORE_OK, return,);
}
}
S1AP_STORE_DATA(
&mme_ue->container, &ies->target_ToSource_TransparentContainer);
if (mme_ue_have_indirect_tunnel(mme_ue) == 1)
{
rv = mme_gtp_send_create_indirect_data_forwarding_tunnel_request(
mme_ue);
d_assert(rv == CORE_OK, return, "gtp send failed");
}
else
{
rv = s1ap_send_handover_command(source_ue);
d_assert(rv == CORE_OK, return, "gtp send failed");
}
}
void s1ap_handle_handover_failure(mme_enb_t *enb, s1ap_message_t *message)
{
status_t rv;
char buf[CORE_ADDRSTRLEN];
S1AP_HandoverFailureIEs_t *ies = NULL;
enb_ue_t *target_ue = NULL;
enb_ue_t *source_ue = NULL;
d_assert(enb, return,);
ies = &message->s1ap_HandoverFailureIEs;
d_assert(ies, return,);
d_trace(3, "[MME] Handover failure\n");
d_trace(5, " IP[%s] ENB_ID[%d]\n",
CORE_ADDR(enb->addr, buf), enb->enb_id);
target_ue = enb_ue_find_by_mme_ue_s1ap_id(ies->mme_ue_s1ap_id);
d_assert(target_ue, return,
"Cannot find UE for MME-UE-S1AP-ID[%d] and eNB[%s:%d]",
ies->mme_ue_s1ap_id,
CORE_ADDR(enb->addr, buf), enb->enb_id);
source_ue = target_ue->source_ue;
d_assert(source_ue, return,);
d_trace(5, " Source : ENB_UE_S1AP_ID[%d] MME_UE_S1AP_ID[%d]\n",
source_ue->enb_ue_s1ap_id, source_ue->mme_ue_s1ap_id);
d_trace(5, " Target : ENB_UE_S1AP_ID[%d] MME_UE_S1AP_ID[%d]\n",
target_ue->enb_ue_s1ap_id, target_ue->mme_ue_s1ap_id);
rv = s1ap_send_handover_preparation_failure(source_ue, &ies->cause);
d_assert(rv == CORE_OK, return, "s1ap send error");
rv = s1ap_send_ue_context_release_command(
target_ue, S1AP_Cause_PR_radioNetwork,
S1AP_CauseRadioNetwork_ho_failure_in_target_EPC_eNB_or_target_system,
S1AP_UE_CTX_REL_DELETE_INDIRECT_TUNNEL, 0);
d_assert(rv == CORE_OK, return, "s1ap send error");
}
void s1ap_handle_handover_cancel(mme_enb_t *enb, s1ap_message_t *message)
{
status_t rv;
char buf[CORE_ADDRSTRLEN];
enb_ue_t *source_ue = NULL;
enb_ue_t *target_ue = NULL;
S1AP_HandoverCancelIEs_t *ies = NULL;
d_assert(enb, return,);
ies = &message->s1ap_HandoverCancelIEs;
d_assert(ies, return,);
d_trace(3, "[MME] Handover cancel\n");
d_trace(5, " IP[%s] ENB_ID[%d]\n",
CORE_ADDR(enb->addr, buf), enb->enb_id);
source_ue = enb_ue_find_by_enb_ue_s1ap_id(enb, ies->eNB_UE_S1AP_ID);
d_assert(source_ue, return,
"Cannot find UE for eNB-UE-S1AP-ID[%d] and eNB[%s:%d]",
ies->eNB_UE_S1AP_ID,
CORE_ADDR(enb->addr, buf), enb->enb_id);
d_assert(source_ue->mme_ue_s1ap_id == ies->mme_ue_s1ap_id, return,
"Conflict MME-UE-S1AP-ID : %d != %d\n",
source_ue->mme_ue_s1ap_id, ies->mme_ue_s1ap_id);
target_ue = source_ue->target_ue;
d_assert(target_ue, return,);
d_trace(5, " Source : ENB_UE_S1AP_ID[%d] MME_UE_S1AP_ID[%d]\n",
source_ue->enb_ue_s1ap_id, source_ue->mme_ue_s1ap_id);
d_trace(5, " Target : ENB_UE_S1AP_ID[%d] MME_UE_S1AP_ID[%d]\n",
target_ue->enb_ue_s1ap_id, target_ue->mme_ue_s1ap_id);
rv = s1ap_send_handover_cancel_ack(source_ue);
d_assert(rv == CORE_OK,, "s1ap send error");
rv = s1ap_send_ue_context_release_command(
target_ue, S1AP_Cause_PR_radioNetwork,
S1AP_CauseRadioNetwork_handover_cancelled,
S1AP_UE_CTX_REL_DELETE_INDIRECT_TUNNEL, 300);
d_assert(rv == CORE_OK, return, "s1ap send error");
d_trace(3, "[MME] Handover Cancel : "
"UE[eNB-UE-S1AP-ID(%d)] --> eNB[%s:%d]\n",
source_ue->enb_ue_s1ap_id,
CORE_ADDR(enb->addr, buf), enb->enb_id);
}
void s1ap_handle_enb_status_transfer(mme_enb_t *enb, s1ap_message_t *message)
{
status_t rv;
char buf[CORE_ADDRSTRLEN];
enb_ue_t *source_ue = NULL, *target_ue = NULL;
S1AP_ENBStatusTransferIEs_t *ies = NULL;
d_assert(enb, return,);
ies = &message->s1ap_ENBStatusTransferIEs;
d_assert(ies, return,);
d_trace(3, "[MME] ENB status transfer\n");
d_trace(5, " IP[%s] ENB_ID[%d]\n",
CORE_ADDR(enb->addr, buf), enb->enb_id);
source_ue = enb_ue_find_by_enb_ue_s1ap_id(enb, ies->eNB_UE_S1AP_ID);
d_assert(source_ue, return,
"Cannot find UE for eNB-UE-S1AP-ID[%d] and eNB[%s:%d]",
ies->eNB_UE_S1AP_ID,
CORE_ADDR(enb->addr, buf), enb->enb_id);
d_assert(source_ue->mme_ue_s1ap_id == ies->mme_ue_s1ap_id, return,
"Conflict MME-UE-S1AP-ID : %d != %d\n",
source_ue->mme_ue_s1ap_id, ies->mme_ue_s1ap_id);
target_ue = source_ue->target_ue;
d_assert(target_ue, return,);
d_trace(5, " Source : ENB_UE_S1AP_ID[%d] MME_UE_S1AP_ID[%d]\n",
source_ue->enb_ue_s1ap_id, source_ue->mme_ue_s1ap_id);
d_trace(5, " Target : ENB_UE_S1AP_ID[%d] MME_UE_S1AP_ID[%d]\n",
target_ue->enb_ue_s1ap_id, target_ue->mme_ue_s1ap_id);
rv = s1ap_send_mme_status_transfer(target_ue, ies);
d_assert(rv == CORE_OK,,);
}
void s1ap_handle_enb_configuration_transfer(
mme_enb_t *enb, s1ap_message_t *message, pkbuf_t *pkbuf)
{
status_t rv;
char buf[CORE_ADDRSTRLEN];
S1AP_ENBConfigurationTransferIEs_t *ies = NULL;
d_assert(enb, return,);
ies = &message->s1ap_ENBConfigurationTransferIEs;
d_assert(ies, return,);
d_trace(3, "[MME] ENB configuration transfer\n");
d_trace(5, " IP[%s] ENB_ID[%d]\n",
CORE_ADDR(enb->addr, buf), enb->enb_id);
if (ies->presenceMask &
S1AP_ENBCONFIGURATIONTRANSFERIES_SONCONFIGURATIONTRANSFERECT_PRESENT)
{
S1AP_SONConfigurationTransfer_t *transfer =
&ies->sonConfigurationTransferECT;
mme_enb_t *target_enb = NULL;
c_uint32_t source_enb_id, target_enb_id;
c_uint16_t source_tac, target_tac;
s1ap_ENB_ID_to_uint32(
&transfer->sourceeNB_ID.global_S1AP_ENB_ID.eNB_ID,
&source_enb_id);
s1ap_ENB_ID_to_uint32(
&transfer->targeteNB_ID.global_S1AP_ENB_ID.eNB_ID,
&target_enb_id);
memcpy(&source_tac, transfer->sourceeNB_ID.selected_S1AP_TAI.tAC.buf,
sizeof(source_tac));
source_tac = ntohs(source_tac);
memcpy(&target_tac, transfer->targeteNB_ID.selected_S1AP_TAI.tAC.buf,
sizeof(target_tac));
target_tac = ntohs(target_tac);
d_trace(5, " Source : ENB_ID[%s:%d], TAC[%d]\n",
transfer->sourceeNB_ID.global_S1AP_ENB_ID.eNB_ID.present ==
S1AP_ENB_ID_PR_homeENB_ID ? "Home" :
transfer->sourceeNB_ID.global_S1AP_ENB_ID.eNB_ID.present ==
S1AP_ENB_ID_PR_macroENB_ID ? "Macro" : "Others",
source_enb_id, source_tac);
d_trace(5, " Target : ENB_ID[%s:%d], TAC[%d]\n",
transfer->targeteNB_ID.global_S1AP_ENB_ID.eNB_ID.present ==
S1AP_ENB_ID_PR_homeENB_ID ? "Home" :
transfer->targeteNB_ID.global_S1AP_ENB_ID.eNB_ID.present ==
S1AP_ENB_ID_PR_macroENB_ID ? "Macro" : "Others",
target_enb_id, target_tac);
target_enb = mme_enb_find_by_enb_id(target_enb_id);
d_assert(target_enb, return,
"Cannot find target eNB = %d", target_enb_id);
rv = s1ap_send_mme_configuration_transfer(target_enb, pkbuf);
d_assert(rv == CORE_OK,,);
}
}
void s1ap_handle_handover_notification(mme_enb_t *enb, s1ap_message_t *message)
{
status_t rv;
char buf[CORE_ADDRSTRLEN];
enb_ue_t *source_ue = NULL;
enb_ue_t *target_ue = NULL;
mme_ue_t *mme_ue = NULL;
mme_sess_t *sess = NULL;
mme_bearer_t *bearer = NULL;
S1AP_HandoverNotifyIEs_t *ies = NULL;
S1AP_EUTRAN_CGI_t *eutran_cgi;
S1AP_PLMNidentity_t *PLMNidentity = NULL;
S1AP_CellIdentity_t *cell_ID = NULL;
S1AP_TAI_t *tai;
S1AP_TAC_t *tAC = NULL;
d_assert(enb, return,);
ies = &message->s1ap_HandoverNotifyIEs;
d_assert(ies, return,);
d_trace(3, "[MME] Handover notification\n");
d_trace(5, " IP[%s] ENB_ID[%d]\n",
CORE_ADDR(enb->addr, buf), enb->enb_id);
eutran_cgi = &ies->eutran_cgi;
d_assert(eutran_cgi, return,);
PLMNidentity = &eutran_cgi->PLMNidentity;
d_assert(PLMNidentity && PLMNidentity->size == sizeof(plmn_id_t), return,);
cell_ID = &eutran_cgi->cell_ID;
d_assert(cell_ID, return,);
tai = &ies->tai;
d_assert(tai, return,);
PLMNidentity = &tai->PLMNidentity;
d_assert(PLMNidentity && PLMNidentity->size == sizeof(plmn_id_t), return,);
tAC = &tai->tAC;
d_assert(tAC && tAC->size == sizeof(c_uint16_t), return,);
target_ue = enb_ue_find_by_enb_ue_s1ap_id(enb, ies->eNB_UE_S1AP_ID);
d_assert(target_ue, return,
"Cannot find UE for eNB-UE-S1AP-ID[%d] and eNB[%s:%d]",
ies->eNB_UE_S1AP_ID,
CORE_ADDR(enb->addr, buf), enb->enb_id);
d_assert(target_ue->mme_ue_s1ap_id == ies->mme_ue_s1ap_id, return,
"Conflict MME-UE-S1AP-ID : %d != %d\n",
target_ue->mme_ue_s1ap_id, ies->mme_ue_s1ap_id);
source_ue = target_ue->source_ue;
d_assert(source_ue, return,);
mme_ue = source_ue->mme_ue;
d_assert(mme_ue, return,);
d_trace(5, " Source : ENB_UE_S1AP_ID[%d] MME_UE_S1AP_ID[%d]\n",
source_ue->enb_ue_s1ap_id, source_ue->mme_ue_s1ap_id);
d_trace(5, " Target : ENB_UE_S1AP_ID[%d] MME_UE_S1AP_ID[%d]\n",
target_ue->enb_ue_s1ap_id, target_ue->mme_ue_s1ap_id);
mme_ue_associate_enb_ue(mme_ue, target_ue);
memcpy(&target_ue->nas.tai.plmn_id, PLMNidentity->buf,
sizeof(target_ue->nas.tai.plmn_id));
memcpy(&target_ue->nas.tai.tac, tAC->buf, sizeof(target_ue->nas.tai.tac));
target_ue->nas.tai.tac = ntohs(target_ue->nas.tai.tac);
memcpy(&target_ue->nas.e_cgi.plmn_id, PLMNidentity->buf,
sizeof(target_ue->nas.e_cgi.plmn_id));
memcpy(&target_ue->nas.e_cgi.cell_id, cell_ID->buf,
sizeof(target_ue->nas.e_cgi.cell_id));
target_ue->nas.e_cgi.cell_id = (ntohl(target_ue->nas.e_cgi.cell_id) >> 4);
d_trace(5, " OLD TAI[PLMN_ID:0x%x,TAC:%d]\n",
mme_ue->tai.plmn_id, mme_ue->tai.tac);
d_trace(5, " OLD E_CGI[PLMN_ID:0x%x,CELL_ID:%d]\n",
mme_ue->e_cgi.plmn_id, mme_ue->e_cgi.cell_id);
d_trace(5, " TAI[PLMN_ID:0x%x,TAC:%d]\n",
target_ue->nas.tai.plmn_id, target_ue->nas.tai.tac);
d_trace(5, " E_CGI[PLMN_ID:0x%x,CELL_ID:%d]\n",
target_ue->nas.e_cgi.plmn_id, target_ue->nas.e_cgi.cell_id);
/* Copy TAI and ECGI from enb_ue */
memcpy(&mme_ue->tai, &target_ue->nas.tai, sizeof(tai_t));
memcpy(&mme_ue->e_cgi, &target_ue->nas.e_cgi, sizeof(e_cgi_t));
sess = mme_sess_first(mme_ue);
while(sess)
{
bearer = mme_bearer_first(sess);
while(bearer)
{
bearer->enb_s1u_teid = bearer->target_s1u_teid;
memcpy(&bearer->enb_s1u_ip, &bearer->target_s1u_ip, sizeof(ip_t));
GTP_COUNTER_INCREMENT(
mme_ue, GTP_COUNTER_MODIFY_BEARER_BY_HANDOVER_NOTIFY);
rv = mme_gtp_send_modify_bearer_request(bearer, 1);
d_assert(rv == CORE_OK, return, "gtp send failed");
bearer = mme_bearer_next(bearer);
}
sess = mme_sess_next(sess);
}
}
#endif
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