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Starting to add the mechanisms to perform GUTI attach.

This commit is contained in:
Pedro Alvarez 2018-01-10 11:35:08 +00:00
parent b14c6e85f4
commit 84e0723c3d
3 changed files with 42 additions and 254 deletions
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10
srsepc/hdr/mme/s1ap.h
View File

@ -71,10 +71,6 @@ public:
bool handle_initiating_message(LIBLTE_S1AP_INITIATINGMESSAGE_STRUCT *msg, struct sctp_sndrcvinfo *enb_sri);
bool handle_successful_outcome(LIBLTE_S1AP_SUCCESSFULOUTCOME_STRUCT *msg);
//bool handle_ue_context_release_request(LIBLTE_S1AP_MESSAGE_UECONTEXTRELEASEREQUEST_STRUCT *ue_rel, struct sctp_sndrcvinfo *enb_sri);
//bool send_initial_context_setup_request(uint32_t mme_ue_s1ap_id, struct srslte::gtpc_create_session_response *cs_resp, struct srslte::gtpc_f_teid_ie sgw_ctrl_fteid);
//bool handle_initial_context_setup_response(LIBLTE_S1AP_MESSAGE_INITIALCONTEXTSETUPRESPONSE_STRUCT *in_ctxt_resp);
void activate_eps_bearer(uint32_t mme_s1ap_id, uint8_t ebi);
void print_enb_ctx_info(const std::string &prefix, const enb_ctx_t &enb_ctx);
@ -87,6 +83,8 @@ public:
void add_new_ue_ctx(const ue_ctx_t &ue_ctx);
bool delete_ue_ctx(ue_ctx_t *ue_ctx);
uint32_t allocate_m_tmsi();
s1ap_args_t m_s1ap_args;
srslte::log_filter *m_s1ap_log;
@ -94,6 +92,8 @@ public:
s1ap_nas_transport* m_s1ap_nas_transport;
s1ap_ctx_mngmt_proc* m_s1ap_ctx_mngmt_proc;
std::map<uint32_t, uint32_t> m_tmsi_to_s1ap_id;
private:
s1ap();
virtual ~s1ap();
@ -110,8 +110,8 @@ private:
std::map<uint32_t, ue_ctx_t*> m_active_ues;
std::map<uint16_t,std::set<uint32_t> > m_enb_id_to_ue_ids;
uint32_t m_next_mme_ue_s1ap_id;
uint32_t m_next_m_tmsi;
//FIXME the GTP-C should be moved to the MME class, the the packaging of GTP-C messages is done.
mme_gtpc *m_mme_gtpc;
};

244
srsepc/src/mme/s1ap.cc
View File

@ -73,7 +73,7 @@ s1ap::init(s1ap_args_t s1ap_args, srslte::log_filter *s1ap_log)
m_s1ap_args = s1ap_args;
srslte::s1ap_mccmnc_to_plmn(s1ap_args.mcc, s1ap_args.mnc, &m_plmn);
m_next_m_tmsi = rand();
//Init log
m_s1ap_log = s1ap_log;
@ -307,243 +307,7 @@ s1ap::handle_successful_outcome(LIBLTE_S1AP_SUCCESSFULOUTCOME_STRUCT *msg)
return true;
}
/*
bool
s1ap::send_initial_context_setup_request(uint32_t mme_ue_s1ap_id, struct srslte::gtpc_create_session_response *cs_resp, struct srslte::gtpc_f_teid_ie sgw_ctrl_fteid)
{
ue_ctx_t *ue_ctx;
//Prepare reply PDU
LIBLTE_S1AP_S1AP_PDU_STRUCT pdu;
bzero(&pdu, sizeof(LIBLTE_S1AP_S1AP_PDU_STRUCT));
pdu.choice_type = LIBLTE_S1AP_S1AP_PDU_CHOICE_INITIATINGMESSAGE;
LIBLTE_S1AP_INITIATINGMESSAGE_STRUCT *init = &pdu.choice.initiatingMessage;
init->procedureCode = LIBLTE_S1AP_PROC_ID_INITIALCONTEXTSETUP;
init->choice_type = LIBLTE_S1AP_INITIATINGMESSAGE_CHOICE_INITIALCONTEXTSETUPREQUEST;
LIBLTE_S1AP_MESSAGE_INITIALCONTEXTSETUPREQUEST_STRUCT *in_ctxt_req = &init->choice.InitialContextSetupRequest;
LIBLTE_S1AP_E_RABTOBESETUPITEMCTXTSUREQ_STRUCT *erab_ctxt = &in_ctxt_req->E_RABToBeSetupListCtxtSUReq.buffer[0]; //FIXME support more than one erab
srslte::byte_buffer_t *reply_buffer = m_pool->allocate();
m_s1ap_log->info("Preparing to send Initial Context Setup request\n");
//Find UE Context
std::map<uint32_t, ue_ctx_t*>::iterator ue_ctx_it = m_active_ues.find(mme_ue_s1ap_id);
if(ue_ctx_it == m_active_ues.end())
{
m_s1ap_log->error("Could not find UE to send Setup Context Request. MME S1AP Id: %d", mme_ue_s1ap_id);
return false;
}
ue_ctx = ue_ctx_it->second;
//Add MME and eNB S1AP Ids
in_ctxt_req->MME_UE_S1AP_ID.MME_UE_S1AP_ID = ue_ctx->mme_ue_s1ap_id;
in_ctxt_req->eNB_UE_S1AP_ID.ENB_UE_S1AP_ID = ue_ctx->enb_ue_s1ap_id;
//Set UE-AMBR
in_ctxt_req->uEaggregateMaximumBitrate.uEaggregateMaximumBitRateDL.BitRate=1000000000;//2^32-1
in_ctxt_req->uEaggregateMaximumBitrate.uEaggregateMaximumBitRateUL.BitRate=1000000000;//FIXME Get UE-AMBR from HSS
//Setup eRAB context
in_ctxt_req->E_RABToBeSetupListCtxtSUReq.len = 1;
erab_ctxt->e_RAB_ID.E_RAB_ID = cs_resp->eps_bearer_context_created.ebi;
//Setup E-RAB QoS parameters
erab_ctxt->e_RABlevelQoSParameters.qCI.QCI = 9;
erab_ctxt->e_RABlevelQoSParameters.allocationRetentionPriority.priorityLevel.PriorityLevel = 15 ;//Lowest
erab_ctxt->e_RABlevelQoSParameters.allocationRetentionPriority.pre_emptionCapability = LIBLTE_S1AP_PRE_EMPTIONCAPABILITY_SHALL_NOT_TRIGGER_PRE_EMPTION;
erab_ctxt->e_RABlevelQoSParameters.allocationRetentionPriority.pre_emptionVulnerability = LIBLTE_S1AP_PRE_EMPTIONVULNERABILITY_PRE_EMPTABLE;
erab_ctxt->e_RABlevelQoSParameters.gbrQosInformation_present=false;
//Set E-RAB S-GW F-TEID
if (cs_resp->eps_bearer_context_created.s1_u_sgw_f_teid_present == false){
m_s1ap_log->error("Did not receive S1-U TEID in create session response\n");
return false;
}
erab_ctxt->transportLayerAddress.n_bits = 32; //IPv4
uint32_t sgw_s1u_ip = htonl(cs_resp->eps_bearer_context_created.s1_u_sgw_f_teid.ipv4);
//uint32_t sgw_s1u_ip = cs_resp->eps_bearer_context_created.s1_u_sgw_f_teid.ipv4;
uint8_t *tmp_ptr = erab_ctxt->transportLayerAddress.buffer;
liblte_value_2_bits(sgw_s1u_ip, &tmp_ptr, 32);//FIXME consider ipv6
uint32_t tmp_teid = cs_resp->eps_bearer_context_created.s1_u_sgw_f_teid.teid;
memcpy(erab_ctxt->gTP_TEID.buffer, &tmp_teid, sizeof(uint32_t));
//Set UE security capabilities and k_enb
bzero(in_ctxt_req->UESecurityCapabilities.encryptionAlgorithms.buffer,sizeof(uint8_t)*16);
bzero(in_ctxt_req->UESecurityCapabilities.integrityProtectionAlgorithms.buffer,sizeof(uint8_t)*16);
for(int i = 0; i<3; i++)
{
if(ue_ctx->ue_network_cap.eea[i+1] == true)
{
in_ctxt_req->UESecurityCapabilities.encryptionAlgorithms.buffer[i] = 1; //EEA supported
}
else
{
in_ctxt_req->UESecurityCapabilities.encryptionAlgorithms.buffer[i] = 0; //EEA not supported
}
if(ue_ctx->ue_network_cap.eia[i+1] == true)
{
in_ctxt_req->UESecurityCapabilities.integrityProtectionAlgorithms.buffer[i] = 1; //EEA supported
}
else
{
in_ctxt_req->UESecurityCapabilities.integrityProtectionAlgorithms.buffer[i] = 0; //EEA not supported
}
// in_ctxt_req->UESecurityCapabilities.integrityProtectionAlgorithms.buffer[0] = 1; //EIA1
}
uint8_t key_enb[32];
liblte_security_generate_k_enb(ue_ctx->security_ctxt.k_asme, ue_ctx->security_ctxt.ul_nas_count, key_enb);
liblte_unpack(key_enb, 32, in_ctxt_req->SecurityKey.buffer);
m_s1ap_log->info("Generating KeNB with UL NAS COUNT: %d\n",ue_ctx->security_ctxt.ul_nas_count);
//Set Attach accepted and activat default bearer NAS messages
if(cs_resp->paa_present != true)
{
m_s1ap_log->error("PAA not present\n");
return false;
}
if(cs_resp->paa.pdn_type != srslte::GTPC_PDN_TYPE_IPV4)
{
m_s1ap_log->error("IPv6 not supported yet\n");
return false;
}
srslte::byte_buffer_t *nas_buffer = m_pool->allocate();
m_s1ap_nas_transport->pack_attach_accept(ue_ctx, erab_ctxt, &cs_resp->paa, nas_buffer);
LIBLTE_ERROR_ENUM err = liblte_s1ap_pack_s1ap_pdu(&pdu, (LIBLTE_BYTE_MSG_STRUCT*)reply_buffer);
if(err != LIBLTE_SUCCESS)
{
m_s1ap_log->error("Could not pack Initial Context Setup Request Message\n");
return false;
}
//Send Reply to eNB
ssize_t n_sent = sctp_send(m_s1mme,reply_buffer->msg, reply_buffer->N_bytes, &ue_ctx->enb_sri, 0);
if(n_sent == -1)
{
m_s1ap_log->error("Failed to send Initial Context Setup Request\n");
return false;
}
//Change E-RAB state to Context Setup Requested and save S-GW control F-TEID
ue_ctx->erabs_ctx[erab_ctxt->e_RAB_ID.E_RAB_ID].state = ERAB_CTX_REQUESTED;
ue_ctx->erabs_ctx[erab_ctxt->e_RAB_ID.E_RAB_ID].sgw_ctrl_fteid.teid = sgw_ctrl_fteid.teid;
ue_ctx->erabs_ctx[erab_ctxt->e_RAB_ID.E_RAB_ID].sgw_ctrl_fteid.ipv4 = sgw_ctrl_fteid.ipv4;
struct in_addr addr;
addr.s_addr = sgw_s1u_ip;
m_s1ap_log->info("Sent Intial Context Setup Request. E-RAB id %d \n",erab_ctxt->e_RAB_ID.E_RAB_ID);
m_s1ap_log->info("Initial Context -- S1-U TEID 0x%x. IP %s \n", tmp_teid,inet_ntoa(addr));
m_s1ap_log->console("Sent Intial Context Setup Request, E-RAB id %d\n",erab_ctxt->e_RAB_ID.E_RAB_ID);
m_s1ap_log->console("Initial Context -- S1-U TEID 0x%x. IP %s \n", tmp_teid,inet_ntoa(addr));
m_pool->deallocate(reply_buffer);
m_pool->deallocate(nas_buffer);
return true;
}
bool
s1ap::handle_initial_context_setup_response(LIBLTE_S1AP_MESSAGE_INITIALCONTEXTSETUPRESPONSE_STRUCT *in_ctxt_resp)
{
uint32_t mme_ue_s1ap_id = in_ctxt_resp->MME_UE_S1AP_ID.MME_UE_S1AP_ID;
std::map<uint32_t,ue_ctx_t*>::iterator ue_ctx_it = m_active_ues.find(mme_ue_s1ap_id);
if (ue_ctx_it == m_active_ues.end())
{
m_s1ap_log->error("Could not find UE's context in active UE's map\n");
return false;
}
for(uint32_t i=0; i<in_ctxt_resp->E_RABSetupListCtxtSURes.len;i++)
{
uint8_t erab_id = in_ctxt_resp->E_RABSetupListCtxtSURes.buffer[i].e_RAB_ID.E_RAB_ID;
erab_ctx_t *erab_ctx = &ue_ctx_it->second->erabs_ctx[erab_id];
if (erab_ctx->state != ERAB_CTX_REQUESTED)
{
m_s1ap_log->error("E-RAB requested was not active %d\n",erab_id);
return false;
}
//Mark E-RAB with context setup
erab_ctx->state = ERAB_CTX_SETUP;
//Set the GTP information
uint8_t *bit_ptr = in_ctxt_resp->E_RABSetupListCtxtSURes.buffer[i].transportLayerAddress.buffer;
erab_ctx->enb_fteid.ipv4 = htonl(liblte_bits_2_value(&bit_ptr,32));
memcpy(&erab_ctx->enb_fteid.teid, in_ctxt_resp->E_RABSetupListCtxtSURes.buffer[i].gTP_TEID.buffer, 4);
erab_ctx->enb_fteid.teid = ntohl(erab_ctx->enb_fteid.teid);
char enb_addr_str[INET_ADDRSTRLEN+1];
const char *err = inet_ntop(AF_INET, &erab_ctx->enb_fteid.ipv4,enb_addr_str,sizeof(enb_addr_str));
if(err == NULL)
{
m_s1ap_log->error("Error converting IP to string\n");
}
m_s1ap_log->info("E-RAB Context Setup. E-RAB id %d\n",erab_ctx->erab_id);
m_s1ap_log->info("E-RAB Context -- eNB TEID 0x%x, eNB Address %s\n", erab_ctx->enb_fteid.teid, enb_addr_str);
m_s1ap_log->console("E-RAB Context Setup. E-RAB id %d\n",erab_ctx->erab_id);
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);
}
return true;
}
bool
s1ap::handle_ue_context_release_request(LIBLTE_S1AP_MESSAGE_UECONTEXTRELEASEREQUEST_STRUCT *ue_rel, struct sctp_sndrcvinfo *enb_sri)
{
uint32_t mme_ue_s1ap_id = ue_rel->MME_UE_S1AP_ID.MME_UE_S1AP_ID;
m_s1ap_log->info("Received UE Context Release Request. MME-UE S1AP Id: %d\n", mme_ue_s1ap_id);
m_s1ap_log->console("Received UE Context Release Request. MME-UE S1AP Id %d\n", mme_ue_s1ap_id);
std::map<uint32_t, ue_ctx_t*>::iterator ue_ctx = m_active_ues.find(mme_ue_s1ap_id);
if(ue_ctx == m_active_ues.end() )
{
m_s1ap_log->info("UE not found. MME-UE S1AP Id: %d\n", mme_ue_s1ap_id);
return false;
}
//Delete UE within eNB UE set
std::map<int32_t,uint16_t>::iterator it = m_sctp_to_enb_id.find(enb_sri->sinfo_assoc_id);
if(it == m_sctp_to_enb_id.end() )
{
m_s1ap_log->error("Could not find eNB for this request.\n");
return false;
}
uint16_t enb_id = it->second;
std::map<uint16_t,std::set<uint32_t> >::iterator ue_set = m_enb_id_to_ue_ids.find(enb_id);
if(ue_set == m_enb_id_to_ue_ids.end())
{
m_s1ap_log->error("Could not find the eNB's UEs.\n");
return false;
}
ue_set->second.erase(mme_ue_s1ap_id);
//Delete any context at the SPGW
bool active = false;
for(int i=0;i<MAX_ERABS_PER_UE;i++)
{
if(ue_ctx->second->erabs_ctx[i].state != ERAB_DEACTIVATED)
{
active = true;
break;
}
}
if(active == true)
{
//There are active E-RABs, send delete session request
m_mme_gtpc->send_delete_session_request(ue_ctx->second);
}
//Delete UE context
delete ue_ctx->second;
m_active_ues.erase(ue_ctx);
m_s1ap_log->info("Deleted UE Context.\n");
return true;
}
*/
bool
s1ap::delete_ue_ctx(ue_ctx_t *ue_ctx)
{
@ -668,6 +432,12 @@ s1ap::activate_eps_bearer(uint32_t mme_s1ap_id, uint8_t ebi)
return;
}
uint32_t
s1ap::allocate_m_tmsi()
{
return m_next_m_tmsi++;
}
void
s1ap::print_enb_ctx_info(const std::string &prefix, const enb_ctx_t &enb_ctx)
{

42
srsepc/src/mme/s1ap_nas_transport.cc
View File

@ -81,7 +81,7 @@ s1ap_nas_transport::handle_initial_ue_message(LIBLTE_S1AP_MESSAGE_INITIALUEMESSA
LIBLTE_MME_ATTACH_REQUEST_MSG_STRUCT attach_req;
LIBLTE_MME_PDN_CONNECTIVITY_REQUEST_MSG_STRUCT pdn_con_req;
uint64_t imsi;
uint64_t imsi = 0;
uint8_t k_asme[32];
uint8_t autn[16];
uint8_t rand[6];
@ -106,13 +106,31 @@ s1ap_nas_transport::handle_initial_ue_message(LIBLTE_S1AP_MESSAGE_INITIALUEMESSA
return false;
}
//Get IMSI
imsi = 0;
for(int i=0;i<=14;i++){
imsi += attach_req.eps_mobile_id.imsi[i]*std::pow(10,14-i);
//Get Mobile ID
if(attach_req.eps_mobile_id.type_of_id == LIBLTE_MME_EPS_MOBILE_ID_TYPE_IMSI)
{
//IMSI style attach
imsi = 0;
for(int i=0;i<=14;i++){
imsi += attach_req.eps_mobile_id.imsi[i]*std::pow(10,14-i);
}
}
else if(attach_req.eps_mobile_id.type_of_id == LIBLTE_MME_EPS_MOBILE_ID_TYPE_GUTI)
{
//GUTI style attach
uint32_t m_tmsi = attach_req.eps_mobile_id.guti.m_tmsi;
std::map<uint32_t,uint32_t>::iterator it = m_s1ap->m_tmsi_to_s1ap_id.find(m_tmsi);
if(it == m_s1ap->m_tmsi_to_s1ap_id.end())
{
//FIXME Send Id request
m_s1ap_log->info("Could not find M-TMSI in attach request\n");
return false;
}
ue_ctx_t *tmp = m_s1ap->find_ue_ctx(it->second);
imsi = tmp->imsi;
}
m_s1ap_log->console("Attach request from IMSI: %015lu\n", imsi);
m_s1ap_log->info("Attach request from IMSI: %015lu\n", imsi);
m_s1ap_log->info("Attach request from IMSI: %015lu\n", imsi);
//Get UE network capabilities
memcpy(&ue_ctx.ue_network_cap, &attach_req.ue_network_cap, sizeof(LIBLTE_MME_UE_NETWORK_CAPABILITY_STRUCT));
@ -745,18 +763,18 @@ s1ap_nas_transport::pack_attach_accept(ue_ctx_t *ue_ctx, LIBLTE_S1AP_E_RABTOBESE
attach_accept.t3412.value = 30; // 30 minute periodic timer
//FIXME: Set tai_list from config
attach_accept.tai_list.N_tais = 1;
attach_accept.tai_list.tai[0].mcc = 1;
attach_accept.tai_list.tai[0].mnc = 1;
attach_accept.tai_list.tai[0].tac = 7;
attach_accept.tai_list.tai[0].mcc = m_s1ap->m_s1ap_args.mcc;
attach_accept.tai_list.tai[0].mnc = m_s1ap->m_s1ap_args.mnc;
attach_accept.tai_list.tai[0].tac = m_s1ap->m_s1ap_args.tac;
//Allocate a GUTI ot the UE
attach_accept.guti_present=true;
attach_accept.guti.type_of_id = 6; //110 -> GUTI
attach_accept.guti.guti.mcc = 1;
attach_accept.guti.guti.mnc = 1;
attach_accept.guti.guti.mcc = m_s1ap->m_s1ap_args.mcc;
attach_accept.guti.guti.mnc = m_s1ap->m_s1ap_args.mnc;
attach_accept.guti.guti.mme_group_id = 0x0001;
attach_accept.guti.guti.mme_code = 0x1a;
attach_accept.guti.guti.m_tmsi = 0x124ae;
attach_accept.guti.guti.m_tmsi = m_s1ap->allocate_m_tmsi();
/*
typedef struct{
uint32 m_tmsi;