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srsRAN_4G
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Moved most of the GUTI attach to nas.cc.

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master
Pedro Alvarez 6 years ago
parent c518d3fde3
commit f6b8982939
4 changed files with 109 additions and 215 deletions
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3
lib/include/srslte/interfaces/epc_interfaces.h
Unescape Escape View File

@ -49,6 +49,9 @@ public:
virtual uint32_t allocate_m_tmsi(uint64_t imsi) = 0;
virtual uint32_t get_next_mme_ue_s1ap_id() = 0;
virtual bool add_nas_ctx_to_imsi_map(nas *nas_ctx) = 0;
virtual bool add_nas_ctx_to_mme_ue_s1ap_id_map(nas *nas_ctx) = 0;
virtual bool add_ue_to_enb_set(int32_t enb_assoc, uint32_t mme_ue_s1ap_id) = 0;
virtual bool release_ue_ecm_ctx(uint32_t mme_ue_s1ap_id) = 0;
virtual bool send_initial_context_setup_request(uint64_t imsi, uint16_t erab_to_setup) = 0;
virtual bool send_ue_context_release_command(uint32_t mme_ue_s1ap_id) = 0;
};

22
srsepc/hdr/mme/nas.h
Unescape Escape View File

@ -148,13 +148,21 @@ public:
srslte::log *nas_log);
/*Initial UE messages*/
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);
bool handle_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);
bool handle_guti_attach_request_unknown_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);

76
srsepc/src/mme/nas.cc
Unescape Escape View File

@ -74,7 +74,7 @@ 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,
nas::handle_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,
@ -159,7 +159,7 @@ nas::handle_nas_guti_attach_request_known_ue( uint32_t enb_ue_s1ap_id,
//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_s1ap->send_ue_context_release_command(m_ecm_ctx.mme_ue_s1ap_id);
}
}
m_sec_ctx.ul_nas_count = 0;
@ -219,6 +219,78 @@ nas::handle_nas_guti_attach_request_known_ue( uint32_t enb_ue_s1ap_id,
return true;
}
}
bool
nas::handle_guti_attach_request_unknown_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)
{
//Could not find IMSI from M-TMSI, send Id request
//The IMSI will be set when the identity response is received
//Set EMM ctx
m_emm_ctx.imsi = 0;
m_emm_ctx.state = EMM_STATE_DEREGISTERED;
//Save UE network capabilities
memcpy(&m_sec_ctx.ue_network_cap, &attach_req.ue_network_cap, sizeof(LIBLTE_MME_UE_NETWORK_CAPABILITY_STRUCT));
m_sec_ctx.ms_network_cap_present = attach_req.ms_network_cap_present;
if (attach_req.ms_network_cap_present) {
memcpy(&m_sec_ctx.ms_network_cap, &attach_req.ms_network_cap, sizeof(LIBLTE_MME_MS_NETWORK_CAPABILITY_STRUCT));
}
//Initialize NAS count
m_sec_ctx.ul_nas_count = 0;
m_sec_ctx.dl_nas_count = 0;
m_emm_ctx.procedure_transaction_id = pdn_con_req.proc_transaction_id;
//Set ECM context
m_ecm_ctx.enb_ue_s1ap_id = enb_ue_s1ap_id;
m_ecm_ctx.mme_ue_s1ap_id = m_s1ap->get_next_mme_ue_s1ap_id();
uint8_t eps_bearer_id = pdn_con_req.eps_bearer_id;
//Save attach request type
m_emm_ctx.attach_type = attach_req.eps_attach_type;
//Save whether ESM information transfer is necessary
m_ecm_ctx.eit = pdn_con_req.esm_info_transfer_flag_present;
//Add eNB info to UE ctxt
memcpy(&m_ecm_ctx.enb_sri, enb_sri, sizeof(struct sctp_sndrcvinfo));
//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;
}
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");
m_nas_log->console("Could not find M-TMSI. Sending ID request\n");
m_nas_log->info("Could not find M-TMSI=. Sending Id Request\n");
//Store temporary ue context
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);
pack_identity_request(reply_buffer);
*reply_flag = true;
return true;
}
/*
*
* Handle Uplink NAS Transport message

223
srsepc/src/mme/s1ap_nas_transport.cc
Unescape Escape View File

@ -504,71 +504,18 @@ s1ap_nas_transport::handle_nas_guti_attach_request( uint32_t enb_ue_s1ap_id,
m_s1ap->m_s1ap_args.mme_apn,
m_s1ap->m_s1ap_args.dns_addr,
m_s1ap, m_mme_gtpc, m_hss, m_s1ap->m_nas_log);
emm_ctx_t *emm_ctx = &nas_ctx->m_emm_ctx;
ecm_ctx_t *ecm_ctx = &nas_ctx->m_ecm_ctx;
sec_ctx_t *sec_ctx = &nas_ctx->m_sec_ctx;
//We do not know the IMSI of the UE yet
//The IMSI will be set when the identity response is received
//Set EMM ctx
emm_ctx->imsi = 0;
emm_ctx->state = EMM_STATE_DEREGISTERED;
//Save UE network capabilities
memcpy(&sec_ctx->ue_network_cap, &attach_req.ue_network_cap, sizeof(LIBLTE_MME_UE_NETWORK_CAPABILITY_STRUCT));
sec_ctx->ms_network_cap_present = attach_req.ms_network_cap_present;
if (attach_req.ms_network_cap_present) {
memcpy(&sec_ctx->ms_network_cap, &attach_req.ms_network_cap, sizeof(LIBLTE_MME_MS_NETWORK_CAPABILITY_STRUCT));
}
//Initialize NAS count
sec_ctx->ul_nas_count = 0;
sec_ctx->dl_nas_count = 0;
emm_ctx->procedure_transaction_id = pdn_con_req.proc_transaction_id;
//Set ECM context
ecm_ctx->enb_ue_s1ap_id = enb_ue_s1ap_id;
ecm_ctx->mme_ue_s1ap_id = m_s1ap->get_next_mme_ue_s1ap_id();
uint8_t eps_bearer_id = pdn_con_req.eps_bearer_id; //TODO: Unused
//Save attach request type
emm_ctx->attach_type = attach_req.eps_attach_type;
//Save whether ESM information transfer is necessary
ecm_ctx->eit = pdn_con_req.esm_info_transfer_flag_present;
//Add eNB info to UE ctxt
memcpy(&ecm_ctx->enb_sri, enb_sri, sizeof(struct sctp_sndrcvinfo));
//Initialize E-RABs
for (uint i = 0 ; i< MAX_ERABS_PER_UE; i++) {
nas_ctx->m_esm_ctx[i].state = ERAB_DEACTIVATED;
nas_ctx->m_esm_ctx[i].erab_id = i;
bool err = nas_ctx->handle_guti_attach_request_unknown_ue( enb_ue_s1ap_id,
attach_req,
pdn_con_req,
nas_msg,
reply_buffer,
reply_flag,
enb_sri);
if (err == false) {
delete nas_ctx;
}
m_s1ap_log->console("Attach request -- IMSI: %015lu\n", emm_ctx->imsi);
m_s1ap_log->info("Attach request -- IMSI: %015lu\n", emm_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");
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%x. Sending Id Request\n", m_tmsi);
//Store temporary ue context
m_s1ap->add_nas_ctx_to_mme_ue_s1ap_id_map(nas_ctx);
m_s1ap->add_ue_to_enb_set(enb_sri->sinfo_assoc_id,ecm_ctx->mme_ue_s1ap_id);
nas_ctx->pack_identity_request(reply_buffer);
*reply_flag = true;
return true;
return err;
} else {
//Found UE context from M-TMSI
m_s1ap_log->console("Attach Request -- Found M-TMSI: %d\n",m_tmsi);
@ -576,149 +523,13 @@ s1ap_nas_transport::handle_nas_guti_attach_request( uint32_t enb_ue_s1ap_id,
//Get UE EMM context
nas *nas_ctx = m_s1ap->find_nas_ctx_from_imsi(it->second);
if (nas_ctx!=NULL) {
emm_ctx_t *emm_ctx = &nas_ctx->m_emm_ctx;
ecm_ctx_t *ecm_ctx = &nas_ctx->m_ecm_ctx;
sec_ctx_t *sec_ctx = &nas_ctx->m_sec_ctx;
m_s1ap_log->console("Found UE context. IMSI: %015lu, old eNB UE S1ap Id %d, old MME UE S1AP Id %d\n",emm_ctx->imsi, ecm_ctx->enb_ue_s1ap_id, ecm_ctx->mme_ue_s1ap_id);
//Check NAS integrity
bool msg_valid = false;
sec_ctx->ul_nas_count++;
msg_valid = nas_ctx->integrity_check(nas_msg);
if (msg_valid == true && emm_ctx->state == EMM_STATE_DEREGISTERED) {
m_s1ap_log->console("GUTI Attach Integrity valid. UL count %d, DL count %d\n",sec_ctx->ul_nas_count, sec_ctx->dl_nas_count);
//Create new MME UE S1AP Identity
ecm_ctx->mme_ue_s1ap_id = m_s1ap->get_next_mme_ue_s1ap_id();
ecm_ctx->enb_ue_s1ap_id = enb_ue_s1ap_id;
emm_ctx->procedure_transaction_id = pdn_con_req.proc_transaction_id;
//Save Attach type
emm_ctx->attach_type = attach_req.eps_attach_type;
//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 = pdn_con_req.esm_info_transfer_flag_present;
//Initialize E-RABs
for (uint i = 0 ; i< MAX_ERABS_PER_UE; i++) {
nas_ctx->m_esm_ctx[i].state = ERAB_DEACTIVATED;
nas_ctx->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(nas_ctx);
m_s1ap->add_ue_to_enb_set(enb_sri->sinfo_assoc_id,ecm_ctx->mme_ue_s1ap_id);
//Re-generate K_eNB
srslte::security_generate_k_enb(sec_ctx->k_asme, sec_ctx->ul_nas_count, sec_ctx->k_enb);
m_s1ap_log->info("Generating KeNB with UL NAS COUNT: %d\n", sec_ctx->ul_nas_count);
m_s1ap_log->console("Generating KeNB with UL NAS COUNT: %d\n", sec_ctx->ul_nas_count);
m_s1ap_log->info_hex(sec_ctx->k_enb, 32, "Key eNodeB (k_enb)\n");
m_s1ap_log->console("Attach request -- IMSI: %015lu\n", emm_ctx->imsi);
m_s1ap_log->info("Attach request -- IMSI: %015lu\n", emm_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.\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");
nas_ctx->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(emm_ctx->imsi,&nas_ctx->m_esm_ctx[default_bearer].qci);
m_s1ap_log->debug("Getting subscription information -- QCI %d\n", nas_ctx->m_esm_ctx[default_bearer].qci);
m_s1ap_log->console("Getting subscription information -- QCI %d\n", nas_ctx->m_esm_ctx[default_bearer].qci);
m_mme_gtpc->send_create_session_request(emm_ctx->imsi);
*reply_flag = false; //No reply needed
}
return true;
} else {
if (emm_ctx->state != EMM_STATE_DEREGISTERED) {
m_s1ap_log->error("Received GUTI-Attach Request from attached user.\n");
m_s1ap_log->console("Received GUTI-Attach Request from attached user.\n");
//Delete previous Ctx, restart authentication
//Detaching previoulsy attached UE.
m_mme_gtpc->send_delete_session_request(emm_ctx->imsi);
if (ecm_ctx->mme_ue_s1ap_id!=0) {
m_s1ap->m_s1ap_ctx_mngmt_proc->send_ue_context_release_command(nas_ctx);
}
}
sec_ctx->ul_nas_count = 0;
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 (ecm_ctx->mme_ue_s1ap_id!=0) {
m_s1ap->release_ue_ecm_ctx(ecm_ctx->mme_ue_s1ap_id);
}
ecm_ctx->mme_ue_s1ap_id = m_s1ap->get_next_mme_ue_s1ap_id();
//Set EMM as de-registered
emm_ctx->state = EMM_STATE_DEREGISTERED;
//Save Attach type
emm_ctx->attach_type = attach_req.eps_attach_type;
//Set UE ECM context
ecm_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 = pdn_con_req.esm_info_transfer_flag_present;
//Initialize E-RABs
for (uint i = 0 ; i< MAX_ERABS_PER_UE; i++) {
nas_ctx->m_esm_ctx[i].state = ERAB_DEACTIVATED;
nas_ctx->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(nas_ctx);
m_s1ap->add_ue_to_enb_set(enb_sri->sinfo_assoc_id,ecm_ctx->mme_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");
uint8_t autn[16];
uint8_t rand[16];
//Get Authentication Vectors from HSS
if (!m_hss->gen_auth_info_answer(emm_ctx->imsi, sec_ctx->k_asme, autn, rand, sec_ctx->xres)) {
m_s1ap_log->console("User not found. IMSI %015lu\n",emm_ctx->imsi);
m_s1ap_log->info("User not found. IMSI %015lu\n",emm_ctx->imsi);
return false;
}
//Restarting security context. Reseting eKSI to 0.
sec_ctx->eksi=0;
nas_ctx->pack_authentication_request(reply_buffer);
//Send reply to eNB
*reply_flag = true;
m_s1ap_log->info("Downlink NAS: Sent Authentication Request\n");
m_s1ap_log->console("Downlink NAS: Sent Authentication Request\n");
return true;
}
nas_ctx->handle_guti_attach_request_known_ue( enb_ue_s1ap_id,
attach_req,
pdn_con_req,
nas_msg,
reply_buffer,
reply_flag,
enb_sri);
} else {
m_s1ap_log->error("Found M-TMSI but could not find UE context\n");
m_s1ap_log->console("Error: Found M-TMSI but could not find UE context\n");

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