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srsLTE
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Packed authentication request message. Code needs cleanup and testing.

This commit is contained in:
Pedro Alvarez 2017-11-02 15:07:28 +00:00
parent 7737acb970
commit fae584dc91
4 changed files with 73 additions and 26 deletions
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1
srsepc/hdr/mme/s1ap.h
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@ -82,6 +82,7 @@ private:
hss *m_hss;
int m_s1mme;
std::map<uint16_t,enb_ctx_t*> m_active_enbs;
uint32_t m_next_mme_ue_s1ap_id;
s1ap_mngmt_proc m_s1ap_mngmt_proc;
s1ap_nas_transport m_s1ap_nas_transport;

2
srsepc/hdr/mme/s1ap_nas_transport.h
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@ -40,7 +40,7 @@ public:
void set_log(srslte::log *s1ap_logger);
bool unpack_initial_ue_message(LIBLTE_S1AP_MESSAGE_S1SETUPREQUEST_STRUCT *msg, uint64_t *imsi);
bool pack_authentication_request();
bool pack_authentication_request(uint8_t *autn,uint8_t *rand);
private:
srslte::log *m_s1ap_log;

72
srsepc/src/mme/s1ap.cc
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@ -32,7 +32,8 @@
namespace srsepc{
s1ap::s1ap():
m_s1mme(-1)
m_s1mme(-1),
m_next_mme_ue_s1ap_id(0)
{
}
@ -183,6 +184,7 @@ s1ap::handle_s1_setup_request(LIBLTE_S1AP_MESSAGE_S1SETUPREQUEST_STRUCT *msg, st
std::string mnc_str, mcc_str;
enb_ctx_t enb_ctx;
srslte::byte_buffer_t reply_msg;
LIBLTE_S1AP_S1AP_PDU_STRUCT reply_pdu;
if(!m_s1ap_mngmt_proc.unpack_s1_setup_request(msg, &enb_ctx))
@ -247,6 +249,8 @@ s1ap::handle_initial_ue_message(LIBLTE_S1AP_MESSAGE_INITIALUEMESSAGE_STRUCT *msg
LIBLTE_MME_ATTACH_REQUEST_MSG_STRUCT attach_req;
LIBLTE_MME_PDN_CONNECTIVITY_REQUEST_MSG_STRUCT pdn_con_req;
/*Get info from initial UE message*/
uint32_t enb_ue_s1ap_id = msg->eNB_UE_S1AP_ID.ENB_UE_S1AP_ID;
/*Get NAS Attach Request Message*/
uint8_t pd, msg_type;
@ -369,10 +373,70 @@ s1ap::handle_initial_ue_message(LIBLTE_S1AP_MESSAGE_INITIALUEMESSAGE_STRUCT *msg
return false;
}
m_s1ap_nas_transport.pack_authentication_request();
return true;
//Pack NAS Authentication Request in Downlink NAS Transport msg
srslte::byte_buffer_t *nas_buffer;
srslte::byte_buffer_t *reply_msg = m_pool->allocate();
//Setup initiating message
LIBLTE_S1AP_S1AP_PDU_STRUCT tx_pdu;
tx_pdu.ext = false;
tx_pdu.choice_type = LIBLTE_S1AP_S1AP_PDU_CHOICE_INITIATINGMESSAGE;
LIBLTE_S1AP_INITIATINGMESSAGE_STRUCT *init = &tx_pdu.choice.initiatingMessage;
init->procedureCode = LIBLTE_S1AP_PROC_ID_DOWNLINKNASTRANSPORT;
init->choice_type = LIBLTE_S1AP_INITIATINGMESSAGE_CHOICE_DOWNLINKNASTRANSPORT;
//Setup Dw NAS message
LIBLTE_S1AP_MESSAGE_DOWNLINKNASTRANSPORT_STRUCT *dw_nas = &init->choice.DownlinkNASTransport;
dw_nas->ext=false;
dw_nas->MME_UE_S1AP_ID.MME_UE_S1AP_ID = m_next_mme_ue_s1ap_id++;
dw_nas->eNB_UE_S1AP_ID.ENB_UE_S1AP_ID = enb_ue_s1ap_id;
dw_nas->HandoverRestrictionList_present=false;
dw_nas->SubscriberProfileIDforRFP_present=false;
/*
typedef struct{
bool ext;
LIBLTE_S1AP_MME_UE_S1AP_ID_STRUCT MME_UE_S1AP_ID;
LIBLTE_S1AP_ENB_UE_S1AP_ID_STRUCT eNB_UE_S1AP_ID;
LIBLTE_S1AP_NAS_PDU_STRUCT NAS_PDU;
LIBLTE_S1AP_HANDOVERRESTRICTIONLIST_STRUCT HandoverRestrictionList;
bool HandoverRestrictionList_present;
LIBLTE_S1AP_SUBSCRIBERPROFILEIDFORRFP_STRUCT SubscriberProfileIDforRFP;
bool SubscriberProfileIDforRFP_present;
}LIBLTE_S1AP_MESSAGE_DOWNLINKNASTRANSPORT_STRUCT;
*/
LIBLTE_MME_AUTHENTICATION_REQUEST_MSG_STRUCT auth_req;
memcpy(auth_req.autn , autn, 16);
memcpy(auth_req.rand, rand, 16);
auth_req.nas_ksi.tsc_flag=LIBLTE_MME_TYPE_OF_SECURITY_CONTEXT_FLAG_NATIVE;
auth_req.nas_ksi.nas_ksi=0;
// NAS_PDU
nas_buffer = m_pool->allocate();
err = liblte_mme_pack_authentication_request_msg(&auth_req, (LIBLTE_BYTE_MSG_STRUCT *) reply_msg);
if(err != LIBLTE_SUCCESS)
{
m_s1ap_log->console("Error packing Athentication Request");
return false;
}
memcpy(dw_nas->NAS_PDU.buffer, reply_msg->msg, reply_msg->N_bytes);
dw_nas->NAS_PDU.n_octets = reply_msg->N_bytes;
//Send Reply to eNB
ssize_t n_sent = sctp_send(m_s1mme,reply_msg->msg, reply_msg->N_bytes, enb_sri, 0);
if(n_sent == -1)
{
m_s1ap_log->console("Failed to send S1 Setup Setup Reply");
return false;
}
m_pool->deallocate(reply_msg);
//TODO Start T3460 Timer!
return true;
}

24
srsepc/src/mme/s1ap_nas_transport.cc
View File

@ -59,28 +59,10 @@ s1ap_nas_transport::pack_authentication_request(uint8_t *autn,uint8_t *rand)
LIBLTE_MME_AUTHENTICATION_REQUEST_MSG_STRUCT pdu;
memcpy(pdu.autn , autn, 16);
memcpy(pdu.rand, rand, 16);
pdu.tsg_flag=LIBLTE_MME_TYPE_OF_SECURITY_CONTEXT_FLAG_NATIVE;
pdu.nas_ksi=0;
pdu.nas_ksi.tsc_flag=LIBLTE_MME_TYPE_OF_SECURITY_CONTEXT_FLAG_NATIVE;
pdu.nas_ksi.nas_ksi=0;
return true;
//typedef struct{
// LIBLTE_MME_NAS_KEY_SET_ID_STRUCT nas_ksi;
// uint8 autn[16];
// uint8 rand[16];
//}LIBLTE_MME_AUTHENTICATION_REQUEST_MSG_STRUCT;
//typedef struct{
// LIBLTE_MME_TYPE_OF_SECURITY_CONTEXT_FLAG_ENUM tsc_flag;
// uint8 nas_ksi;
//}LIBLTE_MME_NAS_KEY_SET_ID_STRUCT;
//typedef enum{
// LIBLTE_MME_TYPE_OF_SECURITY_CONTEXT_FLAG_NATIVE = 0,
// LIBLTE_MME_TYPE_OF_SECURITY_CONTEXT_FLAG_MAPPED,
// LIBLTE_MME_TYPE_OF_SECURITY_CONTEXT_FLAG_N_ITEMS,
//}LIBLTE_MME_TYPE_OF_SECURITY_CONTEXT_FLAG_ENUM;
}
} //namespace srsepc