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Cleaned up the handling of the Initial UE message.

This commit is contained in:
Pedro Alvarez 2018-01-17 19:50:24 +00:00
parent cbc1e24e7e
commit 074cf4526f
3 changed files with 261 additions and 15 deletions
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18
srsepc/hdr/mme/s1ap_nas_transport.h
View File

@ -47,6 +47,24 @@ public:
bool handle_initial_ue_message(LIBLTE_S1AP_MESSAGE_INITIALUEMESSAGE_STRUCT *init_ue, struct sctp_sndrcvinfo *enb_sri, srslte::byte_buffer_t *reply_buffer, bool *reply_flag);
bool handle_uplink_nas_transport(LIBLTE_S1AP_MESSAGE_UPLINKNASTRANSPORT_STRUCT *ul_xport, struct sctp_sndrcvinfo *enb_sri, srslte::byte_buffer_t *reply_buffer, bool *reply_flag);
bool handle_nas_attach_request( uint32_t enb_ue_s1ap_id,
const LIBLTE_MME_ATTACH_REQUEST_MSG_STRUCT &attach_req,
const LIBLTE_MME_PDN_CONNECTIVITY_REQUEST_MSG_STRUCT &pdn_con_req,
srslte::byte_buffer_t *reply_buffer,
bool* reply_flag,
struct sctp_sndrcvinfo *enb_sri);
bool handle_nas_imsi_attach_request(uint32_t enb_ue_s1ap_id,
const LIBLTE_MME_ATTACH_REQUEST_MSG_STRUCT &attach_req,
const LIBLTE_MME_PDN_CONNECTIVITY_REQUEST_MSG_STRUCT &pdn_con_req,
srslte::byte_buffer_t *reply_buffer,
bool* reply_flag,
struct sctp_sndrcvinfo *enb_sri);
bool handle_nas_guti_attach_request(uint32_t enb_ue_s1ap_id,
const LIBLTE_MME_ATTACH_REQUEST_MSG_STRUCT &attach_req,
const LIBLTE_MME_PDN_CONNECTIVITY_REQUEST_MSG_STRUCT &pdn_con_req,
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);

2
srsepc/src/mme/s1ap.cc
View File

@ -285,7 +285,7 @@ s1ap::handle_initiating_message(LIBLTE_S1AP_INITIATINGMESSAGE_STRUCT *msg, stru
ssize_t n_sent = sctp_send(m_s1mme,reply_buffer->msg, reply_buffer->N_bytes, enb_sri, 0);
if(n_sent == -1)
{
m_s1ap_log->console("Failed to send S1 Setup Setup Reply");
m_s1ap_log->console("Failed to send S1 Setup Setup Reply\n");
m_pool->deallocate(reply_buffer);
return false;
}

256
srsepc/src/mme/s1ap_nas_transport.cc
View File

@ -82,19 +82,11 @@ s1ap_nas_transport::handle_initial_ue_message(LIBLTE_S1AP_MESSAGE_INITIALUEMESSA
LIBLTE_MME_PDN_CONNECTIVITY_REQUEST_MSG_STRUCT pdn_con_req;
LIBLTE_MME_SERVICE_REQUEST_MSG_STRUCT service_req;
uint64_t imsi = 0;
uint8_t k_asme[32];
uint8_t autn[16];
uint8_t rand[6];
uint8_t xres[8];
ue_ctx_t ue_ctx;
m_s1ap_log->console("Received Initial UE Message.\n");
m_s1ap_log->info("Received Initial UE Message.\n");
//Get info from initial UE message
ue_ctx.enb_ue_s1ap_id = init_ue->eNB_UE_S1AP_ID.ENB_UE_S1AP_ID;
uint32_t enb_ue_s1ap_id = init_ue->eNB_UE_S1AP_ID.ENB_UE_S1AP_ID;
//Log unhandled Initial UE message IEs
log_unhandled_initial_ue_message_ies(init_ue);
@ -108,12 +100,26 @@ s1ap_nas_transport::handle_initial_ue_message(LIBLTE_S1AP_MESSAGE_INITIALUEMESSA
if(msg_type == LIBLTE_MME_MSG_TYPE_ATTACH_REQUEST)
{
//Get NAS Attach Request and PDN connectivity request messages
if(!unpack_initial_ue_message(init_ue, &attach_req,&pdn_con_req))
LIBLTE_ERROR_ENUM err = liblte_mme_unpack_attach_request_msg((LIBLTE_BYTE_MSG_STRUCT *) nas_msg, &attach_req);
if(err != LIBLTE_SUCCESS){
m_s1ap_log->error("Error unpacking NAS attach request. Error: %s\n", liblte_error_text[err]);
m_pool->deallocate(nas_msg);
return false;
}
/*Get PDN Connectivity Request*/
err = liblte_mme_unpack_pdn_connectivity_request_msg(&attach_req.esm_msg, &pdn_con_req);
if(err != LIBLTE_SUCCESS){
m_s1ap_log->error("Error unpacking NAS PDN Connectivity Request. Error: %s\n", liblte_error_text[err]);
m_pool->deallocate(nas_msg);
return false;
}
/* if(!unpack_initial_ue_message(init_ue, &attach_req,&pdn_con_req))
{
//Could not decode the attach request and the PDN connectivity request.
m_s1ap_log->error("Could not unpack NAS Attach Request and PDN connectivity request.\n");
return false;
}
}*/
handle_nas_attach_request(enb_ue_s1ap_id, attach_req,pdn_con_req,reply_buffer,reply_flag, enb_sri);
}
else if(msg_type == LIBLTE_MME_SECURITY_HDR_TYPE_SERVICE_REQUEST)
{
@ -123,7 +129,9 @@ s1ap_nas_transport::handle_initial_ue_message(LIBLTE_S1AP_MESSAGE_INITIALUEMESSA
return false;
}
m_pool->deallocate(nas_msg);
return true;
/*
//Create basic UE Ctx
ue_ctx_t *ue_ctx_ptr = &ue_ctx;
ue_ctx.imsi = 0;
@ -244,6 +252,7 @@ s1ap_nas_transport::handle_initial_ue_message(LIBLTE_S1AP_MESSAGE_INITIALUEMESSA
m_s1ap_log->info("Sending Athentication Request\n");
m_s1ap_log->console("Sending Athentication Request\n");
//TODO Start T3460 Timer!
*/
return true;
}
@ -302,7 +311,7 @@ s1ap_nas_transport::handle_uplink_nas_transport(LIBLTE_S1AP_MESSAGE_UPLINKNASTRA
break;
case LIBLTE_MME_MSG_TYPE_IDENTITY_RESPONSE:
m_s1ap_log->info("Uplink NAS: Received Identity Response\n");
m_s1ap_log->info("Uplink NAS: Received Identity Response\n");
m_s1ap_log->console("Uplink NAS: Received Identity Response\n");
handle_identity_response(nas_msg, ue_ctx, reply_buffer, reply_flag);
//ue_ctx->security_ctxt.ul_nas_count++;
break;
@ -326,6 +335,225 @@ s1ap_nas_transport::handle_uplink_nas_transport(LIBLTE_S1AP_MESSAGE_UPLINKNASTRA
return true;
}
bool
s1ap_nas_transport::handle_nas_attach_request(uint32_t enb_ue_s1ap_id,
const LIBLTE_MME_ATTACH_REQUEST_MSG_STRUCT &attach_req,
const LIBLTE_MME_PDN_CONNECTIVITY_REQUEST_MSG_STRUCT &pdn_con_req,
srslte::byte_buffer_t *reply_buffer,
bool* reply_flag,
struct sctp_sndrcvinfo *enb_sri)
{
//Get attach type from attach request
if(attach_req.eps_mobile_id.type_of_id == LIBLTE_MME_EPS_MOBILE_ID_TYPE_IMSI)
{
m_s1ap_log->console("Attach Request -- IMSI-style attach request\n");
m_s1ap_log->info("Attach Request -- IMSI-style attach request\n");
handle_nas_imsi_attach_request(enb_ue_s1ap_id, attach_req, pdn_con_req, reply_buffer, reply_flag, enb_sri);
}
else if(attach_req.eps_mobile_id.type_of_id == LIBLTE_MME_EPS_MOBILE_ID_TYPE_GUTI)
{
m_s1ap_log->console("Attach Request -- GUTI-style attach request\n");
m_s1ap_log->info("Attach Request -- GUTI-style attach request\n");
handle_nas_guti_attach_request(enb_ue_s1ap_id, attach_req, pdn_con_req, reply_buffer, reply_flag, enb_sri);
}
else
{
m_s1ap_log->error("Unhandle Mobile Id type in attach request\n");
return false;
}
return true;
}
bool
s1ap_nas_transport::handle_nas_imsi_attach_request(uint32_t enb_ue_s1ap_id,
const LIBLTE_MME_ATTACH_REQUEST_MSG_STRUCT &attach_req,
const LIBLTE_MME_PDN_CONNECTIVITY_REQUEST_MSG_STRUCT &pdn_con_req,
srslte::byte_buffer_t *reply_buffer,
bool* reply_flag,
struct sctp_sndrcvinfo *enb_sri)
{
uint8_t k_asme[32];
uint8_t autn[16];
uint8_t rand[6];
uint8_t xres[8];
ue_ctx_t ue_ctx;
ue_ctx.imsi = 0;
ue_ctx.enb_ue_s1ap_id = enb_ue_s1ap_id;
ue_ctx.mme_ue_s1ap_id = m_s1ap->get_next_mme_ue_s1ap_id();
//Save UE network capabilities
memcpy(&ue_ctx.ue_network_cap, &attach_req.ue_network_cap, sizeof(LIBLTE_MME_UE_NETWORK_CAPABILITY_STRUCT));
ue_ctx.ms_network_cap_present = attach_req.ms_network_cap_present;
if(attach_req.ms_network_cap_present)
{
memcpy(&ue_ctx.ms_network_cap, &attach_req.ms_network_cap, sizeof(LIBLTE_MME_MS_NETWORK_CAPABILITY_STRUCT));
}
uint8_t eps_bearer_id = pdn_con_req.eps_bearer_id; //TODO: Unused
ue_ctx.procedure_transaction_id = pdn_con_req.proc_transaction_id;
//Save whether ESM information transfer is necessary
ue_ctx.eit = pdn_con_req.esm_info_transfer_flag_present;
//m_s1ap_log->console("EPS Bearer id: %d\n", eps_bearer_id);
//Initialize NAS count
ue_ctx.security_ctxt.ul_nas_count = 0;
ue_ctx.security_ctxt.dl_nas_count = 0;
//Add eNB info to UE ctxt
memcpy(&ue_ctx.enb_sri, enb_sri, sizeof(struct sctp_sndrcvinfo));
//Initialize E-RABs
for(uint i = 0 ; i< MAX_ERABS_PER_UE; i++)
{
ue_ctx.erabs_ctx[i].state = ERAB_DEACTIVATED;
ue_ctx.erabs_ctx[i].erab_id = i;
}
//IMSI style attach
ue_ctx.imsi = 0;
for(int i=0;i<=14;i++){
ue_ctx.imsi += attach_req.eps_mobile_id.imsi[i]*std::pow(10,14-i);
}
m_s1ap_log->console("Attach request -- IMSI: %015lu\n", ue_ctx.imsi);
m_s1ap_log->info("Attach request -- IMSI: %015lu\n", ue_ctx.imsi);
m_s1ap_log->console("Attach request -- eNB-UE S1AP Id: %d, MME-UE S1AP Id: %d\n", ue_ctx.enb_ue_s1ap_id, ue_ctx.mme_ue_s1ap_id);
m_s1ap_log->console("Attach Request -- UE Network Capabilities EEA: %d%d%d%d%d%d%d%d\n",
attach_req.ue_network_cap.eea[0],
attach_req.ue_network_cap.eea[1],
attach_req.ue_network_cap.eea[2],
attach_req.ue_network_cap.eea[3],
attach_req.ue_network_cap.eea[4],
attach_req.ue_network_cap.eea[5],
attach_req.ue_network_cap.eea[6],
attach_req.ue_network_cap.eea[7]);
m_s1ap_log->console("Attach Request -- UE Network Capabilities EIA: %d%d%d%d%d%d%d%d\n",
attach_req.ue_network_cap.eia[0],
attach_req.ue_network_cap.eia[1],
attach_req.ue_network_cap.eia[2],
attach_req.ue_network_cap.eia[3],
attach_req.ue_network_cap.eia[4],
attach_req.ue_network_cap.eia[5],
attach_req.ue_network_cap.eia[6],
attach_req.ue_network_cap.eia[7]);
m_s1ap_log->console("Attach Request -- MS Network Capabilities Present: %s\n", attach_req.ms_network_cap_present ? "true" : "false");
m_s1ap_log->console("PDN Connectivity Request -- EPS Bearer Identity requested: %d\n", pdn_con_req.eps_bearer_id);
m_s1ap_log->console("PDN Connectivity Request -- Procedure Transaction Id: %d\n", pdn_con_req.proc_transaction_id);
m_s1ap_log->console("PDN Connectivity Request -- ESM Information Transfer requested: %s\n", pdn_con_req.esm_info_transfer_flag_present ? "true" : "false");
//Get Authentication Vectors from HSS
if(!m_hss->gen_auth_info_answer(ue_ctx.imsi, ue_ctx.security_ctxt.k_asme, autn, rand, ue_ctx.security_ctxt.xres))
{
m_s1ap_log->console("User not found. IMSI %015lu\n",ue_ctx.imsi);
m_s1ap_log->info("User not found. IMSI %015lu\n",ue_ctx.imsi);
return false;
}
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);
//Send reply to eNB
*reply_flag = true;
m_s1ap_log->info("Downlink NAS: Sending Athentication Request\n");
m_s1ap_log->console("Downlink NAS: Sending Athentication Request\n");
return true;
}
bool
s1ap_nas_transport::handle_nas_guti_attach_request(uint32_t enb_ue_s1ap_id,
const LIBLTE_MME_ATTACH_REQUEST_MSG_STRUCT &attach_req,
const LIBLTE_MME_PDN_CONNECTIVITY_REQUEST_MSG_STRUCT &pdn_con_req,
srslte::byte_buffer_t *reply_buffer,
bool* reply_flag,
struct sctp_sndrcvinfo *enb_sri)
{
//GUTI style attach
uint32_t m_tmsi = attach_req.eps_mobile_id.guti.m_tmsi;
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())
{
//Could not find IMSI from M-TMSI, send Id request
ue_ctx_t ue_ctx;
ue_ctx.imsi = 0;
ue_ctx.enb_ue_s1ap_id = enb_ue_s1ap_id;
ue_ctx.mme_ue_s1ap_id = m_s1ap->get_next_mme_ue_s1ap_id();
//Save UE network capabilities
memcpy(&ue_ctx.ue_network_cap, &attach_req.ue_network_cap, sizeof(LIBLTE_MME_UE_NETWORK_CAPABILITY_STRUCT));
ue_ctx.ms_network_cap_present = attach_req.ms_network_cap_present;
if(attach_req.ms_network_cap_present)
{
memcpy(&ue_ctx.ms_network_cap, &attach_req.ms_network_cap, sizeof(LIBLTE_MME_MS_NETWORK_CAPABILITY_STRUCT));
}
uint8_t eps_bearer_id = pdn_con_req.eps_bearer_id; //TODO: Unused
ue_ctx.procedure_transaction_id = pdn_con_req.proc_transaction_id;
//Save whether ESM information transfer is necessary
ue_ctx.eit = pdn_con_req.esm_info_transfer_flag_present;
//m_s1ap_log->console("EPS Bearer id: %d\n", eps_bearer_id);
//Initialize NAS count
ue_ctx.security_ctxt.ul_nas_count = 0;
ue_ctx.security_ctxt.dl_nas_count = 0;
//Add eNB info to UE ctxt
memcpy(&ue_ctx.enb_sri, enb_sri, sizeof(struct sctp_sndrcvinfo));
//Initialize E-RABs
for(uint i = 0 ; i< MAX_ERABS_PER_UE; i++)
{
ue_ctx.erabs_ctx[i].state = ERAB_DEACTIVATED;
ue_ctx.erabs_ctx[i].erab_id = i;
}
m_s1ap_log->console("Attach request -- IMSI: %015lu\n", ue_ctx.imsi);
m_s1ap_log->info("Attach request -- IMSI: %015lu\n", ue_ctx.imsi);
m_s1ap_log->console("Attach request -- eNB-UE S1AP Id: %d, MME-UE S1AP Id: %d\n", ue_ctx.enb_ue_s1ap_id, ue_ctx.mme_ue_s1ap_id);
m_s1ap_log->console("Attach Request -- UE Network Capabilities EEA: %d%d%d%d%d%d%d%d\n",
attach_req.ue_network_cap.eea[0],
attach_req.ue_network_cap.eea[1],
attach_req.ue_network_cap.eea[2],
attach_req.ue_network_cap.eea[3],
attach_req.ue_network_cap.eea[4],
attach_req.ue_network_cap.eea[5],
attach_req.ue_network_cap.eea[6],
attach_req.ue_network_cap.eea[7]);
m_s1ap_log->console("Attach Request -- UE Network Capabilities EIA: %d%d%d%d%d%d%d%d\n",
attach_req.ue_network_cap.eia[0],
attach_req.ue_network_cap.eia[1],
attach_req.ue_network_cap.eia[2],
attach_req.ue_network_cap.eia[3],
attach_req.ue_network_cap.eia[4],
attach_req.ue_network_cap.eia[5],
attach_req.ue_network_cap.eia[6],
attach_req.ue_network_cap.eia[7]);
m_s1ap_log->console("Attach Request -- MS Network Capabilities Present: %s\n", attach_req.ms_network_cap_present ? "true" : "false");
m_s1ap_log->console("PDN Connectivity Request -- EPS Bearer Identity requested: %d\n", pdn_con_req.eps_bearer_id);
m_s1ap_log->console("PDN Connectivity Request -- Procedure Transaction Id: %d\n", pdn_con_req.proc_transaction_id);
m_s1ap_log->console("PDN Connectivity Request -- ESM Information Transfer requested: %s\n", pdn_con_req.esm_info_transfer_flag_present ? "true" : "false");
m_s1ap_log->console("Could not find M-TMSI=0x%x. Sending ID request\n",m_tmsi);
m_s1ap_log->info("Could not find M-TMSI=0x%d. Sending Id Request\n", m_tmsi);
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.enb_ue_s1ap_id, ue_ctx.mme_ue_s1ap_id);
*reply_flag = true;
return true;
}
else{
m_s1ap_log->console("Attach Request -- Found M-TMSI: %d\n",m_tmsi);
ue_ctx_t *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",ue_ctx_ptr->imsi);
m_mme_gtpc->send_create_session_request(ue_ctx_ptr->imsi, ue_ctx_ptr->mme_ue_s1ap_id);
*reply_flag = false; //No reply needed
return true;
}
else
{
m_s1ap_log->error("Found M-TMSI but could not find UE context\n");
return false;
}
}
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)
{
@ -491,8 +719,8 @@ s1ap_nas_transport::handle_identity_response(srslte::byte_buffer_t *nas_msg, ue_
for(int i=0;i<=14;i++){
imsi += id_resp.mobile_id.imsi[i]*std::pow(10,14-i);
}
m_s1ap_log->info("Id Response IMSI: %015lu\n", imsi);
m_s1ap_log->info("Id Response -- IMSI: %015lu\n", imsi);
m_s1ap_log->info("Id Response -- IMSI: %015lu\n", imsi);
ue_ctx->imsi = imsi;
//Get Authentication Vectors from HSS