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Sending ESM information request when GUTI attach passes integrity checks.

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master
Pedro Alvarez 7 years ago
parent d82c0b7f6b
commit 3bc2cb859c
3 changed files with 43 additions and 10 deletions
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4
srsepc/src/mme/s1ap.cc
Unescape Escape View File

@ -550,10 +550,10 @@ s1ap::activate_eps_bearer(uint64_t imsi, uint8_t ebi)
uint32_t
s1ap::allocate_m_tmsi(uint64_t imsi)
{
uint32_t m_tmsi = m_next_m_tmsi++;
// uint32_t m_tmsi = m_next_m_tmsi++;
uint32_t m_tmsi = m_next_m_tmsi;
m_tmsi_to_imsi.insert(std::pair<uint32_t,uint64_t>(m_tmsi,imsi));
m_s1ap_log->debug("Allocated M-TMSI 0x%x to IMSI %015lu,\n",m_tmsi,imsi);
//uint32_t m_tmsi = 0x0123;
return m_tmsi;
}

8
srsepc/src/mme/s1ap_ctx_mngmt_proc.cc
Unescape Escape View File

@ -285,9 +285,13 @@ s1ap_ctx_mngmt_proc::handle_ue_context_release_request(LIBLTE_S1AP_MESSAGE_UECON
//There are active E-RABs, send release access mearers request
m_s1ap_log->console("There are active E-RABs, send release access mearers request");
m_s1ap_log->info("There are active E-RABs, send release access mearers request");
m_mme_gtpc->send_release_access_bearers_request(ecm_ctx->imsi);
//The handle_releease_access_bearers_response function will make sure to mark E-RABS DEACTIVATED
//The handle_release_access_bearers_response function will make sure to mark E-RABS DEACTIVATED
//It will release the UEs downstream S1-u and keep the upstream S1-U connection active.
m_mme_gtpc->send_release_access_bearers_request(ecm_ctx->imsi);
//Send release context command to enb, so that it can release it's bearers
send_ue_context_release_command(ecm_ctx,reply_buffer);
}
else
{

41
srsepc/src/mme/s1ap_nas_transport.cc
Unescape Escape View File

@ -592,7 +592,6 @@ 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);
@ -609,6 +608,7 @@ s1ap_nas_transport::handle_nas_guti_attach_request( uint32_t enb_ue_s1ap_id,
ecm_ctx->enb_ue_s1ap_id = enb_ue_s1ap_id;
ecm_ctx->imsi = ecm_ctx->imsi;
emm_ctx->procedure_transaction_id = pdn_con_req.proc_transaction_id;
//Save Attach type
emm_ctx->attach_type = attach_req.eps_attach_type;
@ -627,16 +627,40 @@ s1ap_nas_transport::handle_nas_guti_attach_request( uint32_t enb_ue_s1ap_id,
//Store context based on MME UE S1AP id
m_s1ap->add_ue_ctx_to_mme_ue_s1ap_id_map(ue_ctx);
//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);
m_s1ap_log->console("Attach request -- IMSI: %015lu\n", ecm_ctx->imsi);
m_s1ap_log->info("Attach request -- IMSI: %015lu\n", ecm_ctx->imsi);
m_s1ap_log->console("Attach request -- eNB-UE S1AP Id: %d, MME-UE S1AP Id: %d\n", ecm_ctx->enb_ue_s1ap_id, ecm_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");
//Create session request
m_s1ap_log->console("GUTI Attach -- NAS Integrity OK.");
m_mme_gtpc->send_create_session_request(emm_ctx->imsi);
*reply_flag = false; //No reply needed
m_s1ap_log->console("GUTI Attach -- NAS Integrity OK.\n");
if(ecm_ctx->eit)
{
m_s1ap_log->console("Secure ESM information transfer requested.\n");
m_s1ap_log->info("Secure ESM information transfer requested.\n");
pack_esm_information_request(reply_buffer, emm_ctx, ecm_ctx);
*reply_flag = true;
}
else
{
m_mme_gtpc->send_create_session_request(emm_ctx->imsi);
*reply_flag = false; //No reply needed
}
return true;
}
else
@ -843,7 +867,10 @@ s1ap_nas_transport::handle_nas_detach_request(uint32_t m_tmsi,
m_s1ap_log->console("Received. M-TMSI 0x%x\n", m_tmsi);
//Received detach request as an initial UE message
//No need to clear ECM context; the request would have been sent as Uplink NAS transport if it was present.
//eNB created new ECM context to send the detach request; this needs to be cleared.
ecm_ctx->mme_ue_s1ap_id = m_s1ap->get_next_mme_ue_s1ap_id();
ecm_ctx->enb_ue_s1ap_id = enb_ue_s1ap_id;
m_s1ap->m_s1ap_ctx_mngmt_proc->send_ue_context_release_command(ecm_ctx, reply_buffer);
return true;
}
@ -863,6 +890,8 @@ s1ap_nas_transport::handle_nas_detach_request(srslte::byte_buffer_t *nas_msg, ue
return false;
}
m_mme_gtpc->send_delete_session_request(ue_ctx->emm_ctx.imsi);
ue_ctx->emm_ctx.state = EMM_STATE_DEREGISTERED;
if(ue_ctx->ecm_ctx.mme_ue_s1ap_id!=0)
{
m_s1ap->m_s1ap_ctx_mngmt_proc->send_ue_context_release_command(&ue_ctx->ecm_ctx, reply_msg);

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