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Changing send initial context setup request to not need the create session response struct.

This commit is contained in:
Pedro Alvarez 2018-02-19 15:19:07 +00:00
parent 82b3e5e380
commit 4ee08fdeca
3 changed files with 67 additions and 51 deletions
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4
srsepc/hdr/mme/s1ap_ctx_mngmt_proc.h
View File

@ -47,7 +47,9 @@ public:
void init(void);
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 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 send_initial_context_setup_request(ue_emm_ctx_t *emm_ctx, ue_ecm_ctx_t *ecm_ctx, uint16_t erab_id,
struct srslte::gtpc_f_teid_ie sgw_ctrl_fteid, struct srslte::gtpc_f_teid_ie sgw_s1u_fteid, struct srslte::gtpc_pdn_address_allocation_ie pdn_addr_aloc);
bool handle_initial_context_setup_response(LIBLTE_S1AP_MESSAGE_INITIALCONTEXTSETUPRESPONSE_STRUCT *in_ctxt_resp);
bool handle_ue_context_release_request(LIBLTE_S1AP_MESSAGE_UECONTEXTRELEASEREQUEST_STRUCT *ue_rel, struct sctp_sndrcvinfo *enb_sri, srslte::byte_buffer_t *reply_buffer, bool *reply_flag);
bool send_ue_context_release_command(ue_ecm_ctx_t *ecm_ctx, srslte::byte_buffer_t *reply_buffer);

84
srsepc/src/mme/s1ap_ctx_mngmt_proc.cc
View File

@ -77,7 +77,12 @@ s1ap_ctx_mngmt_proc::init(void)
}
bool
s1ap_ctx_mngmt_proc::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)
s1ap_ctx_mngmt_proc::send_initial_context_setup_request(ue_emm_ctx_t *emm_ctx,
ue_ecm_ctx_t *ecm_ctx,
uint16_t erab_id,
struct srslte::gtpc_f_teid_ie sgw_ctrl_fteid,
struct srslte::gtpc_f_teid_ie sgw_s1u_fteid,
struct srslte::gtpc_pdn_address_allocation_ie pdn_addr_alloc)
{
int s1mme = m_s1ap->get_s1_mme();
@ -97,23 +102,9 @@ s1ap_ctx_mngmt_proc::send_initial_context_setup_request(uint32_t mme_ue_s1ap_id,
m_s1ap_log->info("Preparing to send Initial Context Setup request\n");
//Find UE Context
ue_ecm_ctx_t *ue_ecm_ctx = m_s1ap->find_ue_ecm_ctx_from_mme_ue_s1ap_id(mme_ue_s1ap_id);
if(ue_ecm_ctx == NULL)
{
m_s1ap_log->error("Could not find UE to send Setup Context Request. MME S1AP Id: %d", mme_ue_s1ap_id);
return false;
}
ue_emm_ctx_t *ue_emm_ctx = m_s1ap->find_ue_emm_ctx_from_imsi(ue_ecm_ctx->imsi);
if(ue_emm_ctx == NULL)
{
m_s1ap_log->error("Could not find UE to send Setup Context Request. MME S1AP Id: %d", mme_ue_s1ap_id);
return false;
}
//Add MME and eNB S1AP Ids
in_ctxt_req->MME_UE_S1AP_ID.MME_UE_S1AP_ID = ue_ecm_ctx->mme_ue_s1ap_id;
in_ctxt_req->eNB_UE_S1AP_ID.ENB_UE_S1AP_ID = ue_ecm_ctx->enb_ue_s1ap_id;
in_ctxt_req->MME_UE_S1AP_ID.MME_UE_S1AP_ID = ecm_ctx->mme_ue_s1ap_id;
in_ctxt_req->eNB_UE_S1AP_ID.ENB_UE_S1AP_ID = ecm_ctx->enb_ue_s1ap_id;
//Set UE-AMBR
in_ctxt_req->uEaggregateMaximumBitrate.uEaggregateMaximumBitRateDL.BitRate=1000000000;
@ -121,7 +112,7 @@ s1ap_ctx_mngmt_proc::send_initial_context_setup_request(uint32_t mme_ue_s1ap_id,
//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;
erab_ctxt->e_RAB_ID.E_RAB_ID = erab_id;
//Setup E-RAB QoS parameters
erab_ctxt->e_RABlevelQoSParameters.qCI.QCI = 9;
erab_ctxt->e_RABlevelQoSParameters.allocationRetentionPriority.priorityLevel.PriorityLevel = 15 ;//Lowest
@ -131,25 +122,25 @@ s1ap_ctx_mngmt_proc::send_initial_context_setup_request(uint32_t mme_ue_s1ap_id,
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;
}
//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 = htonl(sgw_s1u_fteid.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));
uint32_t sgw_s1u_teid = sgw_s1u_fteid.teid;
memcpy(erab_ctxt->gTP_TEID.buffer, &sgw_s1u_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_emm_ctx->security_ctxt.ue_network_cap.eea[i+1] == true)
if(emm_ctx->security_ctxt.ue_network_cap.eea[i+1] == true)
{
in_ctxt_req->UESecurityCapabilities.encryptionAlgorithms.buffer[i] = 1; //EEA supported
}
@ -157,7 +148,7 @@ s1ap_ctx_mngmt_proc::send_initial_context_setup_request(uint32_t mme_ue_s1ap_id,
{
in_ctxt_req->UESecurityCapabilities.encryptionAlgorithms.buffer[i] = 0; //EEA not supported
}
if(ue_emm_ctx->security_ctxt.ue_network_cap.eia[i+1] == true)
if(emm_ctx->security_ctxt.ue_network_cap.eia[i+1] == true)
{
in_ctxt_req->UESecurityCapabilities.integrityProtectionAlgorithms.buffer[i] = 1; //EEA supported
}
@ -168,21 +159,22 @@ s1ap_ctx_mngmt_proc::send_initial_context_setup_request(uint32_t mme_ue_s1ap_id,
// in_ctxt_req->UESecurityCapabilities.integrityProtectionAlgorithms.buffer[0] = 1; //EIA1
}
//Get K eNB
liblte_unpack(ue_emm_ctx->security_ctxt.k_enb, 32, in_ctxt_req->SecurityKey.buffer);
m_s1ap_log->info_hex(ue_emm_ctx->security_ctxt.k_enb, 32, "Initial Context Setup Request -- Key eNB\n");
liblte_unpack(emm_ctx->security_ctxt.k_enb, 32, in_ctxt_req->SecurityKey.buffer);
m_s1ap_log->info_hex(emm_ctx->security_ctxt.k_enb, 32, "Initial Context Setup Request -- Key eNB\n");
//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;
}
//if(cs_resp->paa_present != true)
//{
// m_s1ap_log->error("PDN Adress Allocation 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_emm_ctx, ue_ecm_ctx, erab_ctxt, &cs_resp->paa, nas_buffer);
m_s1ap_nas_transport->pack_attach_accept(emm_ctx, ecm_ctx, erab_ctxt, &pdn_addr_alloc, nas_buffer);
LIBLTE_ERROR_ENUM err = liblte_s1ap_pack_s1ap_pdu(&pdu, (LIBLTE_BYTE_MSG_STRUCT*)reply_buffer);
@ -192,7 +184,7 @@ s1ap_ctx_mngmt_proc::send_initial_context_setup_request(uint32_t mme_ue_s1ap_id,
return false;
}
//Send Reply to eNB
ssize_t n_sent = sctp_send(s1mme,reply_buffer->msg, reply_buffer->N_bytes, &ue_ecm_ctx->enb_sri, 0);
ssize_t n_sent = sctp_send(s1mme,reply_buffer->msg, reply_buffer->N_bytes, &ecm_ctx->enb_sri, 0);
if(n_sent == -1)
{
m_s1ap_log->error("Failed to send Initial Context Setup Request\n");
@ -200,16 +192,16 @@ s1ap_ctx_mngmt_proc::send_initial_context_setup_request(uint32_t mme_ue_s1ap_id,
}
//Change E-RAB state to Context Setup Requested and save S-GW control F-TEID
ue_ecm_ctx->erabs_ctx[erab_ctxt->e_RAB_ID.E_RAB_ID].state = ERAB_CTX_REQUESTED;
ue_ecm_ctx->erabs_ctx[erab_ctxt->e_RAB_ID.E_RAB_ID].sgw_ctrl_fteid.teid = sgw_ctrl_fteid.teid;
ue_ecm_ctx->erabs_ctx[erab_ctxt->e_RAB_ID.E_RAB_ID].sgw_ctrl_fteid.ipv4 = sgw_ctrl_fteid.ipv4;
ecm_ctx->erabs_ctx[erab_ctxt->e_RAB_ID.E_RAB_ID].state = ERAB_CTX_REQUESTED;
ecm_ctx->erabs_ctx[erab_ctxt->e_RAB_ID.E_RAB_ID].sgw_ctrl_fteid.teid = sgw_ctrl_fteid.teid;
ecm_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 = htonl(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->info("Initial Context -- S1-U TEID 0x%x. IP %s \n", sgw_s1u_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_s1ap_log->console("Initial Context -- S1-U TEID 0x%x. IP %s \n", sgw_s1u_teid,inet_ntoa(addr));
m_pool->deallocate(reply_buffer);
m_pool->deallocate(nas_buffer);

30
srsepc/src/mme/s1ap_nas_transport.cc
View File

@ -378,7 +378,6 @@ s1ap_nas_transport::handle_nas_imsi_attach_request(uint32_t enb_ue_s1ap_id,
//Save whether secure ESM information transfer is necessary
ue_ecm_ctx.eit = pdn_con_req.esm_info_transfer_flag_present;
//Add eNB info to UE ctxt
//Initialize E-RABs
for(uint i = 0 ; i< MAX_ERABS_PER_UE; i++)
{
@ -543,6 +542,28 @@ s1ap_nas_transport::handle_nas_guti_attach_request( uint32_t enb_ue_s1ap_id,
msg_valid = integrity_check(ue_emm_ctx,nas_msg);
if(msg_valid == true)
{
//Create new MME UE S1AP Identity
ue_emm_ctx->mme_ue_s1ap_id = m_s1ap->get_next_mme_ue_s1ap_id();
//Create UE ECM context
ue_ecm_ctx_t ue_ecm_ctx;
//Set UE ECM context
ue_ecm_ctx.imsi = ue_emm_ctx->imsi;
ue_ecm_ctx.mme_ue_s1ap_id = ue_emm_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 = pdn_con_req.esm_info_transfer_flag_present;
//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;
}
m_s1ap->add_new_ue_ecm_ctx(ue_ecm_ctx);
//Create session request
m_s1ap_log->console("GUTI Attach -- NAS Integrity OK.");
m_mme_gtpc->send_create_session_request(ue_emm_ctx->imsi, ue_emm_ctx->mme_ue_s1ap_id);
@ -608,9 +629,10 @@ s1ap_nas_transport::handle_nas_service_request(uint32_t m_tmsi,
if(ecm_ctx !=NULL)
{
//Service request to Connected UE.
//Delete ECM context and connect.
m_mme_gtpc->send_delete_session_request(ecm_ctx);
//m_s1ap send_context_release_request(ecm_ctx, reply_buffer);
//Delete eNB context and connect.
m_s1ap->m_s1ap_ctx_mngmt_proc->send_ue_context_release_command(ecm_ctx,reply_buffer);
m_s1ap->m_s1ap_ctx_mngmt_proc->send_initial_context_setup_request(ecm_ctx);
}
else
{