forked from acouzens/open5gs
596 lines
20 KiB
C
596 lines
20 KiB
C
#define TRACE_MODULE _s1ap_handler
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#include "core_debug.h"
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#include "mme_event.h"
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#include "s1ap_conv.h"
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#include "s1ap_build.h"
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#include "s1ap_path.h"
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#include "nas_path.h"
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#include "mme_s11_build.h"
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#include "mme_gtp_path.h"
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#include "s1ap_handler.h"
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void s1ap_handle_s1_setup_request(mme_enb_t *enb, s1ap_message_t *message)
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{
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char buf[INET_ADDRSTRLEN];
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S1ap_S1SetupRequestIEs_t *ies = NULL;
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pkbuf_t *s1apbuf = NULL;
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c_uint32_t enb_id;
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int i,j;
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int num_of_tai = 0;
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d_assert(enb, return, "Null param");
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d_assert(enb->s1ap_sock, return, "Null param");
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d_assert(message, return, "Null param");
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ies = &message->s1ap_S1SetupRequestIEs;
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d_assert(ies, return, "Null param");
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s1ap_ENB_ID_to_uint32(&ies->global_ENB_ID.eNB_ID, &enb_id);
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/* Parse Supported TA */
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for (i = 0; i < ies->supportedTAs.list.count; i++)
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{
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S1ap_SupportedTAs_Item_t *tai = NULL;
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S1ap_TAC_t *tAC;
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tai = (S1ap_SupportedTAs_Item_t *)ies->supportedTAs.list.array[i];
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tAC = &tai->tAC;
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for (j = 0; j < tai->broadcastPLMNs.list.count; j++)
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{
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S1ap_PLMNidentity_t *pLMNidentity = NULL;
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pLMNidentity =
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(S1ap_PLMNidentity_t *)tai->broadcastPLMNs.list.array[j];
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memcpy(&enb->tai[num_of_tai].tac, tAC->buf, sizeof(c_uint16_t));
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enb->tai[num_of_tai].tac = ntohs(enb->tai[num_of_tai].tac);
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memcpy(&enb->tai[num_of_tai].plmn_id, pLMNidentity->buf,
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sizeof(plmn_id_t));
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num_of_tai++;
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}
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}
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enb->num_of_tai = num_of_tai;
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if (enb->num_of_tai == 0)
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{
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d_error("No supported TA exist in s1stup_req messages");
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}
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d_assert(enb->s1ap_sock, return,);
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d_trace(3, "[S1AP] S1SetupRequest : eNB[%s:%d] --> MME\n",
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INET_NTOP(&enb->s1ap_sock->remote.sin_addr.s_addr, buf),
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enb_id);
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enb->enb_id = enb_id;
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d_assert(s1ap_build_setup_rsp(&s1apbuf) == CORE_OK,
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return, "build error");
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d_assert(s1ap_send_to_enb(enb, s1apbuf) == CORE_OK, , "send error");
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d_assert(enb->s1ap_sock, return,);
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d_trace(3, "[S1AP] S1SetupResponse: eNB[%s:%d] <-- MME\n",
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INET_NTOP(&enb->s1ap_sock->remote.sin_addr.s_addr, buf),
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enb_id);
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}
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void s1ap_handle_initial_ue_message(mme_enb_t *enb, s1ap_message_t *message)
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{
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char buf[INET_ADDRSTRLEN];
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enb_ue_t *enb_ue = NULL;
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S1ap_InitialUEMessage_IEs_t *ies = NULL;
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S1ap_TAI_t *tai = NULL;
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S1ap_PLMNidentity_t *pLMNidentity = NULL;
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S1ap_TAC_t *tAC = NULL;
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S1ap_EUTRAN_CGI_t *eutran_cgi = NULL;
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S1ap_CellIdentity_t *cell_ID = NULL;
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d_assert(enb, return, "Null param");
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ies = &message->s1ap_InitialUEMessage_IEs;
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d_assert(ies, return, "Null param");
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tai = &ies->tai;
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d_assert(tai, return,);
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pLMNidentity = &tai->pLMNidentity;
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d_assert(pLMNidentity && pLMNidentity->size == sizeof(plmn_id_t), return,);
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tAC = &tai->tAC;
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d_assert(tAC && tAC->size == sizeof(c_uint16_t), return,);
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eutran_cgi = &ies->eutran_cgi;
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d_assert(eutran_cgi, return,);
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pLMNidentity = &eutran_cgi->pLMNidentity;
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d_assert(pLMNidentity && pLMNidentity->size == sizeof(plmn_id_t), return,);
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cell_ID = &eutran_cgi->cell_ID;
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d_assert(cell_ID, return,);
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enb_ue = enb_ue_find_by_enb_ue_s1ap_id(enb, ies->eNB_UE_S1AP_ID);
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if (!enb_ue)
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{
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enb_ue = enb_ue_add(enb);
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d_assert(enb_ue, return, "Null param");
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enb_ue->enb_ue_s1ap_id = ies->eNB_UE_S1AP_ID;
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/* Find MME_UE if s_tmsi included */
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if (ies->presenceMask &S1AP_INITIALUEMESSAGE_IES_S_TMSI_PRESENT)
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{
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S1ap_S_TMSI_t *s_tmsi = &ies->s_tmsi;
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served_gummei_t *served_gummei = &mme_self()->served_gummei[0];
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guti_t guti;
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mme_ue_t *mme_ue = NULL;
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memset(&guti, 0, sizeof(guti_t));
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/* FIXME : Use the first configured plmn_id and mme group id */
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memcpy(&guti.plmn_id, &served_gummei->plmn_id[0], PLMN_ID_LEN);
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guti.mme_gid = served_gummei->mme_gid[0];
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/* size must be 1 */
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memcpy(&guti.mme_code, s_tmsi->mMEC.buf, s_tmsi->mMEC.size);
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/* size must be 4 */
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memcpy(&guti.m_tmsi, s_tmsi->m_TMSI.buf, s_tmsi->m_TMSI.size);
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guti.m_tmsi = ntohl(guti.m_tmsi);
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mme_ue = mme_ue_find_by_guti(&guti);
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if (!mme_ue)
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{
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d_error("Can not find mme_ue with mme_code = %d, m_tmsi = %d",
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guti.mme_code, guti.m_tmsi);
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}
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else
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{
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mme_associate_ue_context(mme_ue, enb_ue);
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}
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}
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}
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memcpy(&enb_ue->tai.plmn_id, pLMNidentity->buf,
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sizeof(enb_ue->tai.plmn_id));
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memcpy(&enb_ue->tai.tac, tAC->buf, sizeof(enb_ue->tai.tac));
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enb_ue->tai.tac = ntohs(enb_ue->tai.tac);
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memcpy(&enb_ue->e_cgi.plmn_id, pLMNidentity->buf,
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sizeof(enb_ue->e_cgi.plmn_id));
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memcpy(&enb_ue->e_cgi.cell_id, cell_ID->buf, sizeof(enb_ue->e_cgi.cell_id));
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enb_ue->e_cgi.cell_id = (ntohl(enb_ue->e_cgi.cell_id) >> 4);
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d_assert(enb->s1ap_sock, enb_ue_remove(enb_ue); return,);
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d_trace(3, "[S1AP] InitialUEMessage : "
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"UE[eNB-UE-S1AP-ID(%d)] --> eNB[%s:%d]\n",
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enb_ue->enb_ue_s1ap_id,
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INET_NTOP(&enb->s1ap_sock->remote.sin_addr.s_addr, buf),
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enb->enb_id);
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d_assert(s1ap_send_to_nas(enb_ue, &ies->nas_pdu) == CORE_OK,,
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"s1ap_send_to_nas failed");
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}
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void s1ap_handle_uplink_nas_transport(
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mme_enb_t *enb, s1ap_message_t *message)
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{
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char buf[INET_ADDRSTRLEN];
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enb_ue_t *enb_ue = NULL;
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S1ap_UplinkNASTransport_IEs_t *ies = NULL;
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ies = &message->s1ap_UplinkNASTransport_IEs;
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d_assert(ies, return, "Null param");
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enb_ue = enb_ue_find_by_enb_ue_s1ap_id(enb, ies->eNB_UE_S1AP_ID);
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d_assert(enb_ue, return, "No UE Context[%d]", ies->eNB_UE_S1AP_ID);
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d_trace(3, "[S1AP] uplinkNASTransport : "
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"UE[eNB-UE-S1AP-ID(%d)] --> eNB[%s:%d]\n",
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enb_ue->enb_ue_s1ap_id,
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INET_NTOP(&enb->s1ap_sock->remote.sin_addr.s_addr, buf),
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enb->enb_id);
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d_assert(s1ap_send_to_nas(enb_ue, &ies->nas_pdu) == CORE_OK,,
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"s1ap_send_to_nas failed");
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}
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void s1ap_handle_ue_capability_info_indication(
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mme_enb_t *enb, s1ap_message_t *message)
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{
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char buf[INET_ADDRSTRLEN];
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enb_ue_t *enb_ue = NULL;
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S1ap_UECapabilityInfoIndicationIEs_t *ies = NULL;
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ies = &message->s1ap_UECapabilityInfoIndicationIEs;
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d_assert(ies, return, "Null param");
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enb_ue = enb_ue_find_by_enb_ue_s1ap_id(enb, ies->eNB_UE_S1AP_ID);
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d_assert(enb_ue, return, "No UE Context[%d]", ies->eNB_UE_S1AP_ID);
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if (enb_ue->mme_ue)
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{
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S1ap_UERadioCapability_t *ue_radio_capa = NULL;
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S1ap_UERadioCapability_t *radio_capa = NULL;
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mme_ue_t *mme_ue = enb_ue->mme_ue;
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ue_radio_capa = &ies->ueRadioCapability;
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/* Release the previous one */
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if (mme_ue->radio_capa)
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{
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radio_capa = (S1ap_UERadioCapability_t *)mme_ue->radio_capa;
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if (radio_capa->buf)
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core_free(radio_capa->buf);
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core_free(mme_ue->radio_capa);
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}
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/* Save UE radio capability */
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mme_ue->radio_capa = core_calloc(1, sizeof(S1ap_UERadioCapability_t));
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radio_capa = (S1ap_UERadioCapability_t *)mme_ue->radio_capa;
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d_assert(radio_capa,return,"core_calloc Error");
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radio_capa->size = ue_radio_capa->size;
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radio_capa->buf =
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core_calloc(radio_capa->size, sizeof(c_uint8_t));
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d_assert(radio_capa->buf,return,"core_calloc Error(size=%d)",
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radio_capa->size);
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memcpy(radio_capa->buf, ue_radio_capa->buf, radio_capa->size);
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}
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d_trace(3, "[S1AP] UE Capability Info Indication : "
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"UE[eNB-UE-S1AP-ID(%d)] --> eNB[%s:%d]\n",
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enb_ue->enb_ue_s1ap_id,
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INET_NTOP(&enb->s1ap_sock->remote.sin_addr.s_addr, buf),
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enb->enb_id);
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}
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void s1ap_handle_activate_default_bearer_accept(mme_bearer_t *bearer)
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{
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status_t rv;
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mme_ue_t *mme_ue = NULL;
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enb_ue_t *enb_ue = NULL;
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mme_bearer_t *dedicated_bearer = NULL;
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d_assert(bearer, return, "Null param");
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mme_ue = bearer->mme_ue;
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d_assert(mme_ue, return, "Null param");
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enb_ue = mme_ue->enb_ue;
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d_assert(enb_ue, return, "Null param");
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rv = mme_gtp_send_modify_bearer_request(bearer);
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d_assert(rv == CORE_OK, return,
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"mme_gtp_send_modify_bearer_request failed");
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dedicated_bearer = mme_bearer_next(bearer);
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while(dedicated_bearer)
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{
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rv = nas_send_activate_dedicated_bearer_context(
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enb_ue, dedicated_bearer);
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d_assert(rv == CORE_OK, return,
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"nas_send_activate_dedicated_bearer_context failed");
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dedicated_bearer = mme_bearer_next(dedicated_bearer);
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}
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}
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void s1ap_handle_initial_context_setup_response(
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mme_enb_t *enb, s1ap_message_t *message)
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{
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char buf[INET_ADDRSTRLEN];
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int i = 0;
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enb_ue_t *enb_ue = NULL;
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S1ap_InitialContextSetupResponseIEs_t *ies = NULL;
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ies = &message->s1ap_InitialContextSetupResponseIEs;
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d_assert(ies, return, "Null param");
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enb_ue = enb_ue_find_by_enb_ue_s1ap_id(enb, ies->eNB_UE_S1AP_ID);
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d_assert(enb_ue, return, "No UE Context[%d]", ies->eNB_UE_S1AP_ID);
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d_trace(3, "[S1AP] Initial Context Setup Response : "
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"UE[eNB-UE-S1AP-ID(%d)] --> eNB[%s:%d]\n",
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enb_ue->enb_ue_s1ap_id,
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INET_NTOP(&enb->s1ap_sock->remote.sin_addr.s_addr, buf),
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enb->enb_id);
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for (i = 0; i < ies->e_RABSetupListCtxtSURes.
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s1ap_E_RABSetupItemCtxtSURes.count; i++)
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{
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mme_sess_t *sess = NULL;
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mme_bearer_t *bearer = NULL;
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mme_ue_t *mme_ue = enb_ue->mme_ue;
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S1ap_E_RABSetupItemCtxtSURes_t *e_rab = NULL;
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e_rab = (S1ap_E_RABSetupItemCtxtSURes_t *)
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ies->e_RABSetupListCtxtSURes.s1ap_E_RABSetupItemCtxtSURes.array[i];
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d_assert(e_rab, return, "Null param");
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sess = mme_sess_find_by_ebi(mme_ue, e_rab->e_RAB_ID);
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d_assert(sess, return, "Null param");
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bearer = mme_default_bearer_in_sess(sess);
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d_assert(bearer, return, "Null param");
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memcpy(&bearer->enb_s1u_teid, e_rab->gTP_TEID.buf,
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sizeof(bearer->enb_s1u_teid));
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bearer->enb_s1u_teid = ntohl(bearer->enb_s1u_teid);
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memcpy(&bearer->enb_s1u_addr, e_rab->transportLayerAddress.buf,
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sizeof(bearer->enb_s1u_addr));
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if (FSM_CHECK(&bearer->sm, esm_state_active))
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{
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status_t rv;
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mme_bearer_t *dedicated_bearer = NULL;
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rv = mme_gtp_send_modify_bearer_request(bearer);
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d_assert(rv == CORE_OK, return,
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"mme_gtp_send_modify_bearer_request failed");
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dedicated_bearer = mme_bearer_next(bearer);
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while(dedicated_bearer)
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{
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rv = nas_send_activate_dedicated_bearer_context(
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enb_ue, dedicated_bearer);
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d_assert(rv == CORE_OK, return,
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"nas_send_activate_dedicated_bearer_context failed");
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dedicated_bearer = mme_bearer_next(dedicated_bearer);
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}
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}
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}
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}
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void s1ap_handle_e_rab_setup_response(
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mme_enb_t *enb, s1ap_message_t *message)
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{
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char buf[INET_ADDRSTRLEN];
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int i;
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enb_ue_t *enb_ue = NULL;
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S1ap_E_RABSetupResponseIEs_t *ies = NULL;
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d_assert(enb, return, "Null param");
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d_assert(message, return, "Null param");
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ies = &message->s1ap_E_RABSetupResponseIEs;
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d_assert(ies, return, "Null param");
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enb_ue = enb_ue_find_by_enb_ue_s1ap_id(enb, ies->eNB_UE_S1AP_ID);
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d_assert(enb_ue, return, "No UE Context[%d]", ies->eNB_UE_S1AP_ID);
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d_trace(3, "[S1AP] E-RAB Setup Response : "
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"UE[eNB-UE-S1AP-ID(%d)] --> eNB[%s:%d]\n",
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enb_ue->enb_ue_s1ap_id,
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INET_NTOP(&enb->s1ap_sock->remote.sin_addr.s_addr, buf),
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enb->enb_id);
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for (i = 0; i < ies->e_RABSetupListBearerSURes.
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s1ap_E_RABSetupItemBearerSURes.count; i++)
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{
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status_t rv;
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mme_bearer_t *bearer = NULL;
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mme_ue_t *mme_ue = enb_ue->mme_ue;
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S1ap_E_RABSetupItemBearerSURes_t *e_rab = NULL;
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e_rab = (S1ap_E_RABSetupItemBearerSURes_t *)ies->
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e_RABSetupListBearerSURes.s1ap_E_RABSetupItemBearerSURes.array[i];
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d_assert(e_rab, return, "Null param");
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bearer = mme_bearer_find_by_ue_ebi(mme_ue, e_rab->e_RAB_ID);
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d_assert(bearer, return, "Null param");
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memcpy(&bearer->enb_s1u_teid, e_rab->gTP_TEID.buf,
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sizeof(bearer->enb_s1u_teid));
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bearer->enb_s1u_teid = ntohl(bearer->enb_s1u_teid);
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memcpy(&bearer->enb_s1u_addr, e_rab->transportLayerAddress.buf,
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sizeof(bearer->enb_s1u_addr));
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if (FSM_CHECK(&bearer->sm, esm_state_active))
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{
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mme_bearer_t *linked_bearer = mme_linked_bearer(bearer);
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d_assert(linked_bearer, return, "Null param");
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if (linked_bearer->ebi == bearer->ebi) /* Default Bearer */
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{
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mme_bearer_t *dedicated_bearer = NULL;
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rv = mme_gtp_send_modify_bearer_request(bearer);
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d_assert(rv == CORE_OK, return,
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"mme_gtp_send_modify_bearer_request failed");
|
|
|
|
dedicated_bearer = mme_bearer_next(bearer);
|
|
while(dedicated_bearer)
|
|
{
|
|
rv = nas_send_activate_dedicated_bearer_context(
|
|
enb_ue, dedicated_bearer);
|
|
d_assert(rv == CORE_OK, return,
|
|
"nas_send_activate_dedicated_bearer_context failed");
|
|
|
|
dedicated_bearer = mme_bearer_next(dedicated_bearer);
|
|
}
|
|
}
|
|
else /* Dedicated Bearer */
|
|
{
|
|
rv = mme_gtp_send_create_bearer_response(bearer);
|
|
d_assert(rv == CORE_OK, return,
|
|
"mme_gtp_send_create_bearer_response failed");
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
void s1ap_handle_ue_context_release_request(
|
|
mme_enb_t *enb, s1ap_message_t *message)
|
|
{
|
|
char buf[INET_ADDRSTRLEN];
|
|
|
|
enb_ue_t *enb_ue = NULL;
|
|
S1ap_UEContextReleaseRequest_IEs_t *ies = NULL;
|
|
long cause;
|
|
|
|
ies = &message->s1ap_UEContextReleaseRequest_IEs;
|
|
d_assert(ies, return, "Null param");
|
|
|
|
enb_ue = enb_ue_find_by_mme_ue_s1ap_id(ies->mme_ue_s1ap_id);
|
|
d_assert(enb_ue, return, "No UE Context[%d]", ies->mme_ue_s1ap_id);
|
|
|
|
d_trace(3, "[S1AP] UE Context Release Request : "
|
|
"UE[mME-UE-S1AP-ID(%d)] --> eNB[%s:%d]\n",
|
|
enb_ue->mme_ue_s1ap_id,
|
|
INET_NTOP(&enb->s1ap_sock->remote.sin_addr.s_addr, buf),
|
|
enb->enb_id);
|
|
|
|
switch(ies->cause.present)
|
|
{
|
|
case S1ap_Cause_PR_radioNetwork:
|
|
cause = ies->cause.choice.radioNetwork;
|
|
if (cause == S1ap_CauseRadioNetwork_user_inactivity)
|
|
{
|
|
mme_ue_t *mme_ue = enb_ue->mme_ue;
|
|
status_t rv;
|
|
|
|
if (MME_HAVE_SGW_S11_PATH(mme_ue))
|
|
{
|
|
mme_sess_t *sess = mme_sess_first(mme_ue);
|
|
while (sess != NULL)
|
|
{
|
|
gtp_header_t h;
|
|
pkbuf_t *pkbuf = NULL;
|
|
gtp_xact_t *xact = NULL;
|
|
|
|
memset(&h, 0, sizeof(gtp_header_t));
|
|
h.type = GTP_RELEASE_ACCESS_BEARERS_REQUEST_TYPE;
|
|
h.teid = mme_ue->sgw_s11_teid;
|
|
|
|
rv = mme_s11_build_release_access_bearers_request(
|
|
&pkbuf, h.type);
|
|
d_assert(rv == CORE_OK, return, "S11 build error");
|
|
|
|
xact = gtp_xact_local_create(sess->sgw, &h, pkbuf);
|
|
d_assert(xact, return, "Null param");
|
|
|
|
rv = gtp_xact_commit(xact);
|
|
d_assert(rv == CORE_OK, return, "xact_commit error");
|
|
|
|
sess = mme_sess_next(sess);
|
|
}
|
|
}
|
|
else
|
|
{
|
|
s1ap_handle_release_access_bearers_response(enb_ue);
|
|
}
|
|
}
|
|
else
|
|
{
|
|
d_warn("Not implmented (radioNetwork cause : %d)", cause);
|
|
}
|
|
break;
|
|
case S1ap_Cause_PR_transport:
|
|
cause = ies->cause.choice.transport;
|
|
d_warn("Not implmented (transport cause : %d)", cause);
|
|
break;
|
|
case S1ap_Cause_PR_nas:
|
|
cause = ies->cause.choice.nas;
|
|
d_warn("Not implmented (nas cause : %d)", cause);
|
|
break;
|
|
case S1ap_Cause_PR_protocol:
|
|
cause = ies->cause.choice.protocol;
|
|
d_warn("Not implmented (protocol cause : %d)", cause);
|
|
break;
|
|
case S1ap_Cause_PR_misc:
|
|
cause = ies->cause.choice.misc;
|
|
d_warn("Not implmented (misc cause : %d)", cause);
|
|
break;
|
|
default:
|
|
d_warn("Invalid cause type : %d", ies->cause.present);
|
|
break;
|
|
}
|
|
}
|
|
|
|
void s1ap_handle_release_access_bearers_response(enb_ue_t *enb_ue)
|
|
{
|
|
status_t rv;
|
|
mme_enb_t *enb = NULL;
|
|
pkbuf_t *s1apbuf;
|
|
S1ap_Cause_t cause;
|
|
|
|
d_assert(enb_ue, return, "Null param");
|
|
enb = enb_ue->enb;
|
|
d_assert(enb, return, "Null param");
|
|
|
|
cause.present = S1ap_Cause_PR_nas;
|
|
cause.choice.nas = S1ap_CauseNas_normal_release;
|
|
|
|
rv = s1ap_build_ue_context_release_commmand(&s1apbuf, enb_ue, &cause);
|
|
d_assert(rv == CORE_OK && s1apbuf, return, "s1ap build error");
|
|
|
|
d_assert(s1ap_send_to_enb(enb, s1apbuf) == CORE_OK,, "s1ap send error");
|
|
}
|
|
|
|
void s1ap_handle_ue_context_release_complete(
|
|
mme_enb_t *enb, s1ap_message_t *message)
|
|
{
|
|
char buf[INET_ADDRSTRLEN];
|
|
|
|
enb_ue_t *enb_ue = NULL;
|
|
S1ap_UEContextReleaseComplete_IEs_t *ies = NULL;
|
|
|
|
ies = &message->s1ap_UEContextReleaseComplete_IEs;
|
|
d_assert(ies, return, "Null param");
|
|
|
|
enb_ue = enb_ue_find_by_mme_ue_s1ap_id(ies->mme_ue_s1ap_id);
|
|
d_assert(enb_ue, return, "No UE Context[%d]", ies->mme_ue_s1ap_id);
|
|
|
|
d_trace(3, "[S1AP] UE Context Release Complete : "
|
|
"UE[mME-UE-S1AP-ID(%d)] --> eNB[%s:%d]\n",
|
|
enb_ue->mme_ue_s1ap_id,
|
|
INET_NTOP(&enb->s1ap_sock->remote.sin_addr.s_addr, buf),
|
|
enb->enb_id);
|
|
|
|
enb_ue_remove(enb_ue);
|
|
}
|
|
|
|
/* FIXME : Where is a good location S1AP handler or EMM handler?*/
|
|
void s1ap_handle_paging(mme_ue_t *mme_ue)
|
|
{
|
|
pkbuf_t *s1apbuf = NULL;
|
|
mme_enb_t *enb = NULL;
|
|
int i;
|
|
status_t rv;
|
|
|
|
/* Find enB with matched TAI */
|
|
enb = mme_enb_first();
|
|
while (enb)
|
|
{
|
|
for (i = 0; i < enb->num_of_tai; i++)
|
|
{
|
|
if (!memcmp(&enb->tai[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");
|
|
}
|
|
}
|
|
enb = mme_enb_next(enb);
|
|
}
|
|
}
|