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srsepc: send detach accept when receiving detach request for non-switchoff

This commit is contained in:
Andre Puschmann 2020-03-13 14:46:32 +01:00
parent ec19919246
commit 3e9678d496
1 changed files with 25 additions and 0 deletions
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25
srsepc/src/mme/nas.cc
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@ -765,6 +765,31 @@ bool nas::handle_detach_request(uint32_t m_tmsi,
ecm_ctx_t* ecm_ctx = &nas_ctx->m_ecm_ctx;
sec_ctx_t* sec_ctx = &nas_ctx->m_sec_ctx;
// TS 24.301, Sec 5.5.2.2.1, UE initiated detach request
if (detach_req.detach_type.switch_off == 0) {
// UE expects detach accept
srsran::unique_byte_buffer_t nas_tx = srsran::make_byte_buffer();
if (nas_tx == nullptr) {
nas_logger.error("Couldn't allocate PDU in %s().", __FUNCTION__);
return false;
}
LIBLTE_MME_DETACH_ACCEPT_MSG_STRUCT detach_accept = {};
err = liblte_mme_pack_detach_accept_msg(&detach_accept,
LIBLTE_MME_SECURITY_HDR_TYPE_PLAIN_NAS,
sec_ctx->dl_nas_count,
(LIBLTE_BYTE_MSG_STRUCT*)nas_tx.get());
if (err != LIBLTE_SUCCESS) {
nas_logger.error("Error packing Detach Accept\n");
}
nas_logger.info("Sending detach accept.\n");
sec_ctx->dl_nas_count++;
s1ap->send_downlink_nas_transport(enb_ue_s1ap_id, s1ap->get_next_mme_ue_s1ap_id(), nas_tx.get(), *enb_sri);
} else {
nas_logger.info("UE is switched off\n");
}
gtpc->send_delete_session_request(emm_ctx->imsi);
emm_ctx->state = EMM_STATE_DEREGISTERED;
sec_ctx->ul_nas_count++;