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Starting to move inital UE messages to nas.cc. Breaking up attach request handling into smaller functions.

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master
Pedro Alvarez 6 years ago
parent 1f2e22adf4
commit c518d3fde3
3 changed files with 149 additions and 41 deletions
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43
srsepc/hdr/mme/nas.h
Unescape Escape View File

@ -84,7 +84,7 @@ typedef enum
} esm_state_t;
/*
* EMM, ECM, ESM and EPS Security context definition
* EMM, ECM, ESM and EPS Security context definitions
*/
typedef struct{
uint64_t imsi;
@ -148,48 +148,13 @@ public:
srslte::log *nas_log);
/*Initial UE messages*/
bool handle_nas_attach_request( 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_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 *nas_msg,
srslte::byte_buffer_t *reply_buffer,
bool* reply_flag,
struct sctp_sndrcvinfo *enb_sri);
bool handle_nas_service_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_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_tracking_area_update_request( uint32_t m_tmsi,
uint32_t enb_ue_s1ap_id,
bool handle_nas_guti_attach_request_known_ue( 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 *nas_msg,
srslte::byte_buffer_t *reply_buffer,
bool* reply_flag,
struct sctp_sndrcvinfo *enb_sri);
/* Uplink NAS messages handling */
bool handle_nas_authentication_response( srslte::byte_buffer_t *nas_msg, srslte::byte_buffer_t *reply_buffer, bool* reply_flag);
bool handle_nas_security_mode_complete( srslte::byte_buffer_t *nas_msg, srslte::byte_buffer_t *reply_buffer, bool *reply_flag);

145
srsepc/src/mme/nas.cc
Unescape Escape View File

@ -73,7 +73,152 @@ nas::init(uint16_t mcc,
********************************/
//FIXME Move UE Initiating mesages from s1ap_nas_transport
bool
nas::handle_nas_guti_attach_request_known_ue( 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 *nas_msg,
srslte::byte_buffer_t *reply_buffer,
bool* reply_flag,
struct sctp_sndrcvinfo *enb_sri)
{
m_nas_log->console("Found UE context. IMSI: %015lu, old eNB UE S1ap Id %d, old MME UE S1AP Id %d\n",m_emm_ctx.imsi, m_ecm_ctx.enb_ue_s1ap_id, m_ecm_ctx.mme_ue_s1ap_id);
//Check NAS integrity
bool msg_valid = false;
m_sec_ctx.ul_nas_count++;
msg_valid = integrity_check(nas_msg);
if (msg_valid == true && m_emm_ctx.state == EMM_STATE_DEREGISTERED) {
m_nas_log->console("GUTI Attach -- NAS Integrity OK. UL count %d, DL count %d\n",m_sec_ctx.ul_nas_count, m_sec_ctx.dl_nas_count);
m_nas_log->info ("GUTI Attach -- NAS Integrity OK. UL count %d, DL count %d\n",m_sec_ctx.ul_nas_count, m_sec_ctx.dl_nas_count);
//Create new MME UE S1AP Identity
m_ecm_ctx.mme_ue_s1ap_id = m_s1ap->get_next_mme_ue_s1ap_id();
m_ecm_ctx.enb_ue_s1ap_id = enb_ue_s1ap_id;
m_emm_ctx.procedure_transaction_id = pdn_con_req.proc_transaction_id;
//Save Attach type
m_emm_ctx.attach_type = attach_req.eps_attach_type;
//Set eNB information
m_ecm_ctx.enb_ue_s1ap_id = enb_ue_s1ap_id;
memcpy(&m_ecm_ctx.enb_sri, enb_sri, sizeof(struct sctp_sndrcvinfo));
//Save whether secure ESM information transfer is necessary
m_ecm_ctx.eit = pdn_con_req.esm_info_transfer_flag_present;
//Initialize E-RABs
for (uint i = 0 ; i< MAX_ERABS_PER_UE; i++) {
m_esm_ctx[i].state = ERAB_DEACTIVATED;
m_esm_ctx[i].erab_id = i;
}
//Store context based on MME UE S1AP id
m_s1ap->add_nas_ctx_to_mme_ue_s1ap_id_map(this);
m_s1ap->add_ue_to_enb_set(enb_sri->sinfo_assoc_id, m_ecm_ctx.mme_ue_s1ap_id);
//Re-generate K_eNB
srslte::security_generate_k_enb(m_sec_ctx.k_asme, m_sec_ctx.ul_nas_count, m_sec_ctx.k_enb);
m_nas_log->info("Generating KeNB with UL NAS COUNT: %d\n", m_sec_ctx.ul_nas_count);
m_nas_log->console("Generating KeNB with UL NAS COUNT: %d\n", m_sec_ctx.ul_nas_count);
m_nas_log->info_hex(m_sec_ctx.k_enb, 32, "Key eNodeB (k_enb)\n");
m_nas_log->console("Attach request -- IMSI: %015lu\n", m_emm_ctx.imsi);
m_nas_log->info("Attach request -- IMSI: %015lu\n", m_emm_ctx.imsi);
m_nas_log->console("Attach request -- eNB-UE S1AP Id: %d, MME-UE S1AP Id: %d\n", m_ecm_ctx.enb_ue_s1ap_id, m_ecm_ctx.mme_ue_s1ap_id);
m_nas_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_nas_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_nas_log->console("Attach Request -- MS Network Capabilities Present: %s\n", attach_req.ms_network_cap_present ? "true" : "false");
m_nas_log->console("PDN Connectivity Request -- EPS Bearer Identity requested: %d\n", pdn_con_req.eps_bearer_id);
m_nas_log->console("PDN Connectivity Request -- Procedure Transaction Id: %d\n", pdn_con_req.proc_transaction_id);
m_nas_log->console("PDN Connectivity Request -- ESM Information Transfer requested: %s\n", pdn_con_req.esm_info_transfer_flag_present ? "true" : "false");
if (m_ecm_ctx.eit) {
m_nas_log->console("Secure ESM information transfer requested.\n");
m_nas_log->info("Secure ESM information transfer requested.\n");
pack_esm_information_request(reply_buffer);
*reply_flag = true;
} else {
//Get subscriber info from HSS
uint8_t default_bearer=5;
m_hss->gen_update_loc_answer(m_emm_ctx.imsi,&m_esm_ctx[default_bearer].qci);
m_nas_log->debug("Getting subscription information -- QCI %d\n", m_esm_ctx[default_bearer].qci);
m_nas_log->console("Getting subscription information -- QCI %d\n", m_esm_ctx[default_bearer].qci);
m_gtpc->send_create_session_request(m_emm_ctx.imsi);
*reply_flag = false; //No reply needed
}
return true;
} else {
if (m_emm_ctx.state != EMM_STATE_DEREGISTERED) {
m_nas_log->error("Received GUTI-Attach Request from attached user.\n");
m_nas_log->console("Received GUTI-Attach Request from attached user.\n");
//Delete previous Ctx, restart authentication
//Detaching previoulsy attached UE.
m_gtpc->send_delete_session_request(m_emm_ctx.imsi);
if (m_ecm_ctx.mme_ue_s1ap_id != 0) {
m_s1ap->m_s1ap_ctx_mngmt_proc->send_ue_context_release_command(this);
}
}
m_sec_ctx.ul_nas_count = 0;
m_sec_ctx.dl_nas_count = 0;
//Create new MME UE S1AP Identity
uint32_t new_mme_ue_s1ap_id = m_s1ap->get_next_mme_ue_s1ap_id();
//Make sure context from previous NAS connections is not present
if (m_ecm_ctx.mme_ue_s1ap_id!=0) {
m_s1ap->release_ue_ecm_ctx(m_ecm_ctx.mme_ue_s1ap_id);
}
m_ecm_ctx.mme_ue_s1ap_id = m_s1ap->get_next_mme_ue_s1ap_id();
//Set EMM as de-registered
m_emm_ctx.state = EMM_STATE_DEREGISTERED;
//Save Attach type
m_emm_ctx.attach_type = attach_req.eps_attach_type;
//Set UE ECM context
m_ecm_ctx.mme_ue_s1ap_id = m_ecm_ctx.mme_ue_s1ap_id;
//Set eNB information
m_ecm_ctx.enb_ue_s1ap_id = enb_ue_s1ap_id;
memcpy(&m_ecm_ctx.enb_sri, enb_sri, sizeof(struct sctp_sndrcvinfo));
//Save whether secure ESM information transfer is necessary
m_ecm_ctx.eit = pdn_con_req.esm_info_transfer_flag_present;
//Initialize E-RABs
for (uint i = 0 ; i< MAX_ERABS_PER_UE; i++) {
m_esm_ctx[i].state = ERAB_DEACTIVATED;
m_esm_ctx[i].erab_id = i;
}
//Store context based on MME UE S1AP id
m_s1ap->add_nas_ctx_to_mme_ue_s1ap_id_map(this);
m_s1ap->add_ue_to_enb_set(enb_sri->sinfo_assoc_id,m_ecm_ctx.mme_ue_s1ap_id);
//NAS integrity failed. Re-start authentication process.
m_nas_log->console("GUTI Attach request NAS integrity failed.\n");
m_nas_log->console("RE-starting authentication procedure.\n");
//Get Authentication Vectors from HSS
if (!m_hss->gen_auth_info_answer(m_emm_ctx.imsi, m_sec_ctx.k_asme, m_sec_ctx.autn, m_sec_ctx.rand, m_sec_ctx.xres)) {
m_nas_log->console("User not found. IMSI %015lu\n",m_emm_ctx.imsi);
m_nas_log->info("User not found. IMSI %015lu\n",m_emm_ctx.imsi);
return false;
}
//Restarting security context. Reseting eKSI to 0.
m_sec_ctx.eksi=0;
pack_authentication_request(reply_buffer);
//Send reply to eNB
*reply_flag = true;
m_nas_log->info("Downlink NAS: Sent Authentication Request\n");
m_nas_log->console("Downlink NAS: Sent Authentication Request\n");
return true;
}
}
/*
*
* Handle Uplink NAS Transport message

2
srsepc/src/mme/s1ap_nas_transport.cc
Unescape Escape View File

@ -39,12 +39,10 @@ pthread_mutex_t s1ap_nas_transport_instance_mutex = PTHREAD_MUTEX_INITIALIZER;
s1ap_nas_transport::s1ap_nas_transport()
{
return;
}
s1ap_nas_transport::~s1ap_nas_transport()
{
return;
}
s1ap_nas_transport*

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