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Starting to add support to NAS detach request.

This commit is contained in:
Pedro Alvarez 2018-03-22 18:54:06 +00:00
parent ba3a579a92
commit b73a4da8f9
2 changed files with 74 additions and 11 deletions
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7
srsepc/hdr/mme/s1ap_nas_transport.h
View File

@ -74,6 +74,13 @@ public:
bool* reply_flag,
struct sctp_sndrcvinfo *enb_sri);
bool handle_nas_detach_request(uint32_t m_tmsi,
uint32_t enb_ue_s1ap_id,
srslte::byte_buffer_t *nas_msg,
srslte::byte_buffer_t *reply_buffer,
bool* reply_flag,
struct sctp_sndrcvinfo *enb_sri);
bool handle_nas_authentication_response(srslte::byte_buffer_t *nas_msg, ue_ctx_t *ue_ctx, srslte::byte_buffer_t *reply_buffer, bool* reply_flag);
bool handle_nas_security_mode_complete(srslte::byte_buffer_t *nas_msg, ue_ctx_t *ue_ctx, srslte::byte_buffer_t *reply_buffer, bool *reply_flag);
bool handle_nas_attach_complete(srslte::byte_buffer_t *nas_msg, ue_ctx_t *ue_ctx, srslte::byte_buffer_t *reply_buffer, bool *reply_flag);

78
srsepc/src/mme/s1ap_nas_transport.cc
View File

@ -122,6 +122,26 @@ s1ap_nas_transport::handle_initial_ue_message(LIBLTE_S1AP_MESSAGE_INITIALUEMESSA
handle_nas_service_request(ntohl(*m_tmsi), enb_ue_s1ap_id, nas_msg, reply_buffer,reply_flag, enb_sri);
return true;
}
else if(msg_type == LIBLTE_MME_MSG_TYPE_DETACH_REQUEST)
{
m_s1ap_log->console("Received Detach Request\n");
m_s1ap_log->info("Received Detach Request\n");
if(!init_ue->S_TMSI_present)
{
m_s1ap_log->error("Service request -- S-TMSI not present\n");
m_s1ap_log->console("Service request -- S-TMSI not present\n" );
return false;
}
uint32_t *m_tmsi = (uint32_t*) &init_ue->S_TMSI.m_TMSI.buffer;
uint32_t enb_ue_s1ap_id = init_ue->eNB_UE_S1AP_ID.ENB_UE_S1AP_ID;
m_s1ap_log->info("Detach Request -- S-TMSI 0x%x\n", ntohl(*m_tmsi));
m_s1ap_log->console("Detach Request -- S-TMSI 0x%x\n", ntohl(*m_tmsi) );
m_s1ap_log->info("Detach Request -- eNB UE S1AP Id %d\n", enb_ue_s1ap_id);
m_s1ap_log->console("Detach Request -- eNB UE S1AP Id %d\n", enb_ue_s1ap_id);
handle_nas_detach_request(ntohl(*m_tmsi), enb_ue_s1ap_id, nas_msg, reply_buffer,reply_flag, enb_sri);
return true;
}
else
{
m_s1ap_log->info("Unhandled Initial UE Message 0x%x\n",msg_type);
@ -240,27 +260,25 @@ s1ap_nas_transport::handle_uplink_nas_transport(LIBLTE_S1AP_MESSAGE_UPLINKNASTRA
}
switch (msg_type) {
case LIBLTE_MME_MSG_TYPE_ATTACH_COMPLETE:
m_s1ap_log->info("Uplink NAS: Received Attach Complete\n");
m_s1ap_log->console("Uplink NAS: Received Attach Complete\n");
m_s1ap_log->info("Integrity Protected UL NAS: Received Attach Complete\n");
m_s1ap_log->console("Integrity Protected UL NAS: Received Attach Complete\n");
handle_nas_attach_complete(nas_msg, ue_ctx, reply_buffer, reply_flag);
break;
case LIBLTE_MME_MSG_TYPE_ESM_INFORMATION_RESPONSE:
m_s1ap_log->info("Uplink NAS: Received ESM Information Response\n");
m_s1ap_log->console("Uplink NAS: Received ESM Information Response\n");
m_s1ap_log->info("Integrity Protected UL NAS: Received ESM Information Response\n");
m_s1ap_log->console("Integrity Protected UL NAS: Received ESM Information Response\n");
handle_esm_information_response(nas_msg, ue_ctx, reply_buffer, reply_flag);
break;
case LIBLTE_MME_MSG_TYPE_TRACKING_AREA_UPDATE_REQUEST:
m_s1ap_log->info("UL NAS: Tracking Area Update Request\n");
m_s1ap_log->info("Integrity Protected UL NAS: Tracking Area Update Request\n");
m_s1ap_log->console("Integrity Protected UL NAS: Tracking Area Update Request\n");
handle_tracking_area_update_request(nas_msg, ue_ctx, reply_buffer, reply_flag);
break;
case LIBLTE_MME_MSG_TYPE_AUTHENTICATION_FAILURE:
m_s1ap_log->info("Uplink NAS: Authentication Failure\n");
m_s1ap_log->info("Integrity Protected UL NAS: Authentication Failure\n");
m_s1ap_log->info("Integrity Protected UL NAS: Authentication Failure\n");
handle_authentication_failure(nas_msg, ue_ctx, reply_buffer, reply_flag);
break;
/* case LIBLTE_MME_MSG_TYPE_DETACH_REQUEST:
m_s1ap_log->info("Uplink NAS: Detach Request\n");
handle_detach_request(nas_msg, ue_ctx, reply_buffer, reply_flag);
break;*/
default:
m_s1ap_log->warning("Unhandled NAS integrity protected message 0x%x\n", msg_type );
m_s1ap_log->console("Unhandled NAS integrity protected message 0x%x\n", msg_type );
@ -557,7 +575,7 @@ s1ap_nas_transport::handle_nas_guti_attach_request( uint32_t enb_ue_s1ap_id,
else{
m_s1ap_log->console("Attach Request -- Found M-TMSI: %d\n",m_tmsi);
m_s1ap_log->console("Attach Request -- IMSI: %d\n",it->second);
m_s1ap_log->console("Attach Request -- IMSI: %015lu\n",it->second);
//Get UE EMM context
ue_ctx_t *ue_ctx = m_s1ap->find_ue_ctx_from_imsi(it->second);
if(ue_ctx!=NULL)
@ -569,8 +587,11 @@ s1ap_nas_transport::handle_nas_guti_attach_request( uint32_t enb_ue_s1ap_id,
bool msg_valid = false;
emm_ctx->security_ctxt.ul_nas_count++;
msg_valid = integrity_check(emm_ctx,nas_msg);
if(msg_valid == true)
{
m_s1ap_log->console("GUTI Attach Integrity valid. UL count %d, DL count %d\n",emm_ctx->security_ctxt.ul_nas_count, emm_ctx->security_ctxt.dl_nas_count);
//Create new MME UE S1AP Identity
uint32_t new_mme_ue_s1ap_id = m_s1ap->get_next_mme_ue_s1ap_id();
@ -609,6 +630,7 @@ s1ap_nas_transport::handle_nas_guti_attach_request( uint32_t enb_ue_s1ap_id,
//Re-generate K_eNB
liblte_security_generate_k_enb(emm_ctx->security_ctxt.k_asme, emm_ctx->security_ctxt.ul_nas_count, emm_ctx->security_ctxt.k_enb);
m_s1ap_log->info("Generating KeNB with UL NAS COUNT: %d\n",emm_ctx->security_ctxt.ul_nas_count);
m_s1ap_log->console("Generating KeNB with UL NAS COUNT: %d\n",emm_ctx->security_ctxt.ul_nas_count);
//Create session request
m_s1ap_log->console("GUTI Attach -- NAS Integrity OK.");
@ -786,6 +808,39 @@ s1ap_nas_transport::handle_nas_service_request(uint32_t m_tmsi,
return true;
}
bool
s1ap_nas_transport::handle_nas_detach_request(uint32_t m_tmsi,
uint32_t enb_ue_s1ap_id,
srslte::byte_buffer_t *nas_msg,
srslte::byte_buffer_t *reply_buffer,
bool* reply_flag,
struct sctp_sndrcvinfo *enb_sri)
{
bool mac_valid = false;
LIBLTE_MME_DETACH_REQUEST_MSG_STRUCT detach_req;
LIBLTE_ERROR_ENUM err = liblte_mme_unpack_detach_request_msg((LIBLTE_BYTE_MSG_STRUCT*) nas_msg, &detach_req);
if(err !=LIBLTE_SUCCESS)
{
m_s1ap_log->error("Could not unpack detach request\n");
return false;
}
std::map<uint32_t,uint64_t>::iterator it = m_s1ap->m_tmsi_to_imsi.find(m_tmsi);
if(it == m_s1ap->m_tmsi_to_imsi.end())
{
m_s1ap_log->console("Could not find IMSI from M-TMSI. M-TMSI 0x%x\n", m_tmsi);
m_s1ap_log->error("Could not find IMSI from M-TMSI. M-TMSI 0x%x\n", m_tmsi);
return true;
}
ue_ctx_t *ue_ctx = m_s1ap->find_ue_ctx_from_imsi(it->second);
ue_emm_ctx_t *emm_ctx = &ue_ctx->emm_ctx;
ue_ecm_ctx_t *ecm_ctx = &ue_ctx->ecm_ctx;
m_s1ap->m_s1ap_ctx_mngmt_proc->send_ue_context_release_command(ecm_ctx,reply_buffer);
emm_ctx->security_ctxt.ul_nas_count++;
return true;
}
bool
s1ap_nas_transport::handle_nas_authentication_response(srslte::byte_buffer_t *nas_msg, ue_ctx_t *ue_ctx, srslte::byte_buffer_t *reply_buffer, bool* reply_flag)
{
@ -882,6 +937,7 @@ s1ap_nas_transport::handle_nas_security_mode_complete(srslte::byte_buffer_t *nas
return true;
}
bool
s1ap_nas_transport::handle_nas_attach_complete(srslte::byte_buffer_t *nas_msg, ue_ctx_t *ue_ctx, srslte::byte_buffer_t *reply_msg, bool *reply_flag)
{