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srsRAN_4G
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Starting to make sure that UL S1-U fteid and S11 SGW ctr fteid are kept, even when UE context release is called.

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master
Pedro Alvarez 7 years ago
parent ff8818590a
commit be09457ccb
3 changed files with 83 additions and 64 deletions
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19
srsepc/hdr/mme/s1ap_common.h
Unescape Escape View File

@ -82,6 +82,7 @@ enum erab_state
ERAB_ACTIVE
};
typedef struct{
uint8_t mme_code;
uint16_t mme_group;
@ -139,9 +140,7 @@ typedef struct{
emm_state_t state;
uint32_t mme_ue_s1ap_id;
uint8_t attach_type;
//enum nas_init_msg init_msg;
//enum emm_connection_management conn_mngmnt_state;
//enum emm_common_proc common_proc_state;
srslte::gtpc_f_teid_ie sgw_ctrl_fteid;
} ue_emm_ctx_t;
typedef struct{
@ -150,24 +149,14 @@ typedef struct{
uint32_t mme_ue_s1ap_id;
struct sctp_sndrcvinfo enb_sri;
ecm_state_t state;
srslte::gtpc_f_teid_ie sgw_ctrl_fteid;
erab_ctx_t erabs_ctx[MAX_ERABS_PER_UE];
bool eit;
} ue_ecm_ctx_t;
typedef struct{
uint64_t imsi;
uint32_t enb_ue_s1ap_id;
uint32_t mme_ue_s1ap_id;
uint16_t enb_id;
struct sctp_sndrcvinfo enb_sri;
emm_state_t emm_state;
eps_security_ctx_t security_ctxt;
erab_ctx_t erabs_ctx[MAX_ERABS_PER_UE];
bool eit;
uint8_t procedure_transaction_id;
uint8_t attach_type;
ue_emm_ctx_t emm_ctx;
ue_ecm_ctx_t ecm_ctx;
} ue_ctx_t;
}//namespace
#endif

14
srsepc/src/mme/s1ap_ctx_mngmt_proc.cc
Unescape Escape View File

@ -217,7 +217,7 @@ s1ap_ctx_mngmt_proc::handle_initial_context_setup_response(LIBLTE_S1AP_MESSAGE_I
m_s1ap_log->error("Could not find UE's EMM context in active UE's map\n");
return false;
}
m_s1ap_log->console("Received Initial Context Setup Response\n");
//Setup E-RABs
for(uint32_t i=0; i<in_ctxt_resp->E_RABSetupListCtxtSURes.len;i++)
{
@ -250,8 +250,10 @@ s1ap_ctx_mngmt_proc::handle_initial_context_setup_response(LIBLTE_S1AP_MESSAGE_I
m_s1ap_log->console("E-RAB Context -- eNB TEID 0x%x; eNB GTP-U Address %s\n", erab_ctx->enb_fteid.teid, enb_addr_str);
}
if(emm_ctx->state == EMM_STATE_DEREGISTERED)
if(emm_ctx->state == EMM_STATE_REGISTERED)
{
m_s1ap_log->console("Initial Context Setup Response triggered from Service Request.\n");
m_s1ap_log->console("Sending Modify Bearer Request.\n");
m_mme_gtpc->send_modify_bearer_request(ue_ecm_ctx->imsi, &ue_ecm_ctx->erabs_ctx[5]);
}
return true;
@ -279,6 +281,8 @@ s1ap_ctx_mngmt_proc::handle_ue_context_release_request(LIBLTE_S1AP_MESSAGE_UECON
if (ecm_ctx->state == ECM_STATE_CONNECTED)
{
//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);
}
else
@ -293,8 +297,10 @@ s1ap_ctx_mngmt_proc::handle_ue_context_release_request(LIBLTE_S1AP_MESSAGE_UECON
ecm_ctx->erabs_ctx[i].state = ERAB_DEACTIVATED;
}
//Delete UE context
m_s1ap->delete_ue_ecm_ctx(ecm_ctx->mme_ue_s1ap_id);
m_s1ap_log->info("Deleted UE ECM Context.\n");
ecm_ctx->state = ECM_STATE_DISCONNECTED;
ecm_ctx->mme_ue_s1ap_id = 0;
m_s1ap_log->info("UE ECM Disconnected.\n");
m_s1ap_log->console("Deleted UE ECM Context.\n");
return true;
}

112
srsepc/src/mme/s1ap_nas_transport.cc
Unescape Escape View File

@ -492,6 +492,7 @@ s1ap_nas_transport::handle_nas_guti_attach_request( uint32_t enb_ue_s1ap_id,
//Set tmp UE EMM context
tmp_ue_emm_ctx.imsi = 0;
tmp_ue_emm_ctx.state = EMM_STATE_DEREGISTERED;
//Save UE network capabilities
memcpy(&tmp_ue_emm_ctx.security_ctxt.ue_network_cap, &attach_req.ue_network_cap, sizeof(LIBLTE_MME_UE_NETWORK_CAPABILITY_STRUCT));
@ -570,6 +571,8 @@ s1ap_nas_transport::handle_nas_guti_attach_request( uint32_t enb_ue_s1ap_id,
//Create new MME UE S1AP Identity
ue_emm_ctx->mme_ue_s1ap_id = m_s1ap->get_next_mme_ue_s1ap_id();
//Set EMM as de-registered
ue_emm_ctx->state = EMM_STATE_DEREGISTERED;
//Save Attach type
ue_emm_ctx->attach_type = attach_req.eps_attach_type;
//Create UE ECM context
@ -602,7 +605,9 @@ s1ap_nas_transport::handle_nas_guti_attach_request( uint32_t enb_ue_s1ap_id,
//NAS integrity failed. Re-start authentication process.
m_s1ap_log->console("GUTI Attach request NAS integrity failed.\n");
m_s1ap_log->console("RE-starting authentication procedure.\n");
//FIXME
//pack_identity_request();
//(srslte::byte_buffer_t *reply_msg, uint32_t enb_ue_s1ap_id, uint32_t mme_ue_s1ap_id)
return true;
}
}
else
@ -660,61 +665,80 @@ s1ap_nas_transport::handle_nas_service_request(uint32_t m_tmsi,
m_s1ap_log->console("Service Request -- Short MAC valid\n");
m_s1ap_log->info("Service Request -- Short MAC valid\n");
ue_ecm_ctx_t *ecm_ctx = m_s1ap->find_ue_ecm_ctx_from_mme_ue_s1ap_id(emm_ctx->mme_ue_s1ap_id);
if(ecm_ctx !=NULL)
if(ecm_ctx == NULL)
{
//Service request to Connected UE.
//Set eNB UE S1ap identity
ecm_ctx->enb_ue_s1ap_id = enb_ue_s1ap_id;
m_s1ap_log->console("Service Request -- eNB UE S1AP Id %d \n", enb_ue_s1ap_id);
m_s1ap_log->info("Service Request -- eNB UE S1AP Id %d\n ", enb_ue_s1ap_id);
//Delete eNB context and connect.
m_s1ap_log->console("Service Request -- User has ECM context already\n");
m_s1ap_log->info("Service Request -- User has ECM context already\n");
m_s1ap->m_s1ap_ctx_mngmt_proc->send_ue_context_release_command(ecm_ctx,reply_buffer);
//int default_bearer_id = 5;
//m_s1ap->m_s1ap_ctx_mngmt_proc->send_initial_context_setup_request(emm_ctx, ecm_ctx, &ecm_ctx->erabs_ctx[default_bearer_id]);
m_s1ap_log->console("UE ECM context is not initialized.\n");
m_s1ap_log->error("UE ECM context is not initialized.\n");
pack_service_reject(reply_buffer, LIBLTE_MME_EMM_CAUSE_IMPLICITLY_DETACHED, enb_ue_s1ap_id);
*reply_flag = true;
return true;
}
else
{
ue_ecm_ctx_t ue_ecm_ctx;
ue_ecm_ctx.enb_ue_s1ap_id = enb_ue_s1ap_id;
//UE not connect. Connect normally.
m_s1ap_log->console("Service Request -- User without ECM context\n");
m_s1ap_log->info("Service Request -- User without ECM context\n");
//Create ECM context
ue_ecm_ctx.imsi = emm_ctx->imsi;
ue_ecm_ctx.mme_ue_s1ap_id = m_s1ap->get_next_mme_ue_s1ap_id();
emm_ctx->mme_ue_s1ap_id = ue_ecm_ctx.mme_ue_s1ap_id;
//Set eNB information
ue_ecm_ctx.enb_ue_s1ap_id = enb_ue_s1ap_id;
memcpy(&ue_ecm_ctx.enb_sri, enb_sri, sizeof(struct sctp_sndrcvinfo));
//Save whether secure ESM information transfer is necessary
ue_ecm_ctx.eit = false;
//Initialize E-RABs
for(uint i = 0 ; i< MAX_ERABS_PER_UE; i++)
if(ecm_ctx->state == ECM_STATE_CONNECTED)
{
m_s1ap_log->error("Service Request -- User is ECM CONNECTED\n");
//Service request to Connected UE.
//Set eNB UE S1ap identity
ecm_ctx->enb_ue_s1ap_id = enb_ue_s1ap_id;
m_s1ap_log->console("Service Request -- eNB UE S1AP Id %d \n", enb_ue_s1ap_id);
m_s1ap_log->info("Service Request -- eNB UE S1AP Id %d\n ", enb_ue_s1ap_id);
//Delete eNB context and connect.
m_s1ap_log->console("Service Request -- User has ECM context already\n");
m_s1ap_log->info("Service Request -- User has ECM context already\n");
m_s1ap->m_s1ap_ctx_mngmt_proc->send_ue_context_release_command(ecm_ctx,reply_buffer);
//int default_bearer_id = 5;
//m_s1ap->m_s1ap_ctx_mngmt_proc->send_initial_context_setup_request(emm_ctx, ecm_ctx, &ecm_ctx->erabs_ctx[default_bearer_id]);
//FIXME Send Modify context request OR send ctx release command and wait for the reply.
}
else if(ecm_ctx->state == ECM_STATE_DISCONNECTED)
{
ecm_ctx->enb_ue_s1ap_id = enb_ue_s1ap_id;
//UE not connect. Connect normally.
m_s1ap_log->console("Service Request -- User is ECM DISCONNECTED\n");
m_s1ap_log->info("Service Request -- User is ECM DISCONNECTED\n");
//Create ECM context
ecm_ctx->imsi = emm_ctx->imsi;
ecm_ctx->mme_ue_s1ap_id = m_s1ap->get_next_mme_ue_s1ap_id();
emm_ctx->mme_ue_s1ap_id = ecm_ctx->mme_ue_s1ap_id;
//Set eNB information
ecm_ctx->enb_ue_s1ap_id = enb_ue_s1ap_id;
memcpy(&ecm_ctx->enb_sri, enb_sri, sizeof(struct sctp_sndrcvinfo));
//Save whether secure ESM information transfer is necessary
ecm_ctx->eit = false;
//Initialize E-RABs
for(uint i = 0 ; i< MAX_ERABS_PER_UE; i++)
{
ue_ecm_ctx.erabs_ctx[i].state = ERAB_DEACTIVATED;
ue_ecm_ctx.erabs_ctx[i].erab_id = i;
}
ecm_ctx = m_s1ap->find_ue_ecm_ctx_from_mme_ue_s1ap_id(emm_ctx->mme_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("UE Ctr TEID %d\n", emm_ctx->sgw_ctrl_fteid.teid);
m_s1ap->m_s1ap_ctx_mngmt_proc->send_initial_context_setup_request(emm_ctx, ecm_ctx,&ecm_ctx->erabs_ctx[5]);
}
else
{
ue_ecm_ctx.erabs_ctx[i].state = ERAB_DEACTIVATED;
ue_ecm_ctx.erabs_ctx[i].erab_id = i;
m_s1ap_log->console("ECM context is un-initialized.\n");
m_s1ap_log->error("ECM context is un-initialized.\n");
}
memcpy(&ue_ecm_ctx.enb_sri, enb_sri, sizeof(struct sctp_sndrcvinfo));
m_s1ap->add_new_ue_ecm_ctx(ue_ecm_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);
//FIXME Send Modify context request OR send ctx release command and wait for the reply.
m_mme_gtpc->send_create_session_request(ue_ecm_ctx.imsi);
m_s1ap_log->console("UE ESM Ctr TEID %d\n", ue_ecm_ctx.sgw_ctrl_fteid.teid);
}
}
else
{
m_s1ap_log->console("Service Request -- Short MAC invalid. Re-starting authentication procedure \n");
m_s1ap_log->console("Service Request -- Short MAC invalid. Re-starting authentication procedure \n");
m_s1ap_log->console("Authentication procedure is not restarted yet!\n");
}
return true;
}

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