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srsLTE
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Starting to add the ability of GUTI attach without requesting the ID, if the UE is already known.

This commit is contained in:
Pedro Alvarez 2018-01-15 12:56:37 +00:00
parent 3984e1d9db
commit 82bc1f7ff3
1 changed files with 17 additions and 12 deletions
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29
srsepc/src/mme/s1ap_nas_transport.cc
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@ -107,6 +107,7 @@ s1ap_nas_transport::handle_initial_ue_message(LIBLTE_S1AP_MESSAGE_INITIALUEMESSA
}
//Create basic UE Ctx
ue_ctx_t *ue_ctx_ptr = &ue_ctx;
ue_ctx.imsi = 0;
ue_ctx.mme_ue_s1ap_id = m_s1ap->get_next_mme_ue_s1ap_id();
//Get UE network capabilities
@ -152,20 +153,26 @@ s1ap_nas_transport::handle_initial_ue_message(LIBLTE_S1AP_MESSAGE_INITIALUEMESSA
std::map<uint32_t,uint32_t>::iterator it = m_s1ap->m_tmsi_to_s1ap_id.find(m_tmsi);
if(it == m_s1ap->m_tmsi_to_s1ap_id.end())
{
//FIXME Send Id request
//Could not find IMSI from M-TMSI, send Id request
m_s1ap_log->console("Could not find M-TMSI in attach request. Sending ID request\n");
m_s1ap_log->info("Could not find M-TMSI in attach request. Sending Id Request\n");
ue_ctx.mme_ue_s1ap_id = m_s1ap->get_next_mme_ue_s1ap_id();
m_s1ap->add_new_ue_ctx(ue_ctx);
pack_identity_request(reply_buffer, ue_ctx.mme_ue_s1ap_id, ue_ctx.enb_ue_s1ap_id);
*reply_flag = true;
return true;
}
m_s1ap_log->console("Found M-TMSI: %d\n",m_tmsi);
ue_ctx_t *tmp = m_s1ap->find_ue_ctx(it->second);
if(tmp!=NULL)
ue_ctx_ptr = m_s1ap->find_ue_ctx(it->second);
if(ue_ctx_ptr!=NULL)
{
m_s1ap_log->console("Found UE context. IMSI: %015lu\n",tmp->imsi);
imsi = tmp->imsi;
m_s1ap_log->console("Found UE context. IMSI: %015lu\n",ue_ctx_ptr->imsi);
imsi = ue_ctx_ptr->imsi;
}
else
{
m_s1ap_log->error("Found M-TMSI but could not find UE context\n");
return false;
}
}
m_s1ap_log->console("Attach request from IMSI: %015lu\n", imsi);
@ -173,7 +180,7 @@ s1ap_nas_transport::handle_initial_ue_message(LIBLTE_S1AP_MESSAGE_INITIALUEMESSA
//Get Authentication Vectors from HSS
if(!m_hss->gen_auth_info_answer(imsi, ue_ctx.security_ctxt.k_asme, autn, rand, ue_ctx.security_ctxt.xres))
if(!m_hss->gen_auth_info_answer(imsi, ue_ctx_ptr->security_ctxt.k_asme, autn, rand, ue_ctx_ptr->security_ctxt.xres))
{
m_s1ap_log->console("User not found. IMSI %015lu\n",imsi);
m_s1ap_log->info("User not found. IMSI %015lu\n",imsi);
@ -181,16 +188,15 @@ s1ap_nas_transport::handle_initial_ue_message(LIBLTE_S1AP_MESSAGE_INITIALUEMESSA
}
//Save UE context
ue_ctx.imsi = imsi;
ue_ctx.mme_ue_s1ap_id = m_s1ap->get_next_mme_ue_s1ap_id();
//ue_ctx.imsi = imsi;
if(attach_req.eps_mobile_id.type_of_id == LIBLTE_MME_EPS_MOBILE_ID_TYPE_IMSI)
{
//IMSI attach requeires new UE ctxt
ue_ctx.mme_ue_s1ap_id = m_s1ap->get_next_mme_ue_s1ap_id();
m_s1ap->add_new_ue_ctx(ue_ctx);
}
//Pack NAS Authentication Request in Downlink NAS Transport msg
pack_authentication_request(reply_buffer, ue_ctx.enb_ue_s1ap_id, ue_ctx.mme_ue_s1ap_id, autn, rand);
pack_authentication_request(reply_buffer, ue_ctx_ptr->enb_ue_s1ap_id, ue_ctx_ptr->mme_ue_s1ap_id, autn, rand);
//Send reply to eNB
*reply_flag = true;
@ -454,8 +460,7 @@ s1ap_nas_transport::handle_identity_response(srslte::byte_buffer_t *nas_msg, ue_
//Send reply to eNB
*reply_flag = true;
m_s1ap_log->info("DL NAS: Sent Athentication Request\n");
//TODO Start T3460 Timer!
return true;
//TODO Start T3460 Timer!
return true;
}