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srsLTE
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Sendind intial context setup in response to service request.

This commit is contained in:
Pedro Alvarez 2018-02-19 17:54:01 +00:00
parent 4ee08fdeca
commit fc0f1e4c23
5 changed files with 69 additions and 39 deletions
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2
srsepc/hdr/mme/s1ap_common.h
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@ -126,6 +126,8 @@ typedef struct{
uint8_t erab_id;
srslte::gtpc_f_teid_ie enb_fteid;
srslte::gtpc_f_teid_ie sgw_ctrl_fteid;
srslte::gtpc_f_teid_ie sgw_s1u_fteid;
srslte::gtpc_pdn_address_allocation_ie pdn_addr_alloc;
} erab_ctx_t;
typedef struct{

3
srsepc/hdr/mme/s1ap_ctx_mngmt_proc.h
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@ -48,8 +48,7 @@ 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(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 send_initial_context_setup_request(ue_emm_ctx_t *emm_ctx, ue_ecm_ctx_t *ecm_ctx, erab_ctx_t *erab_ctx);
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);

42
srsepc/src/mme/mme_gtpc.cc
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@ -162,11 +162,51 @@ mme_gtpc::handle_create_session_response(srslte::gtpc_pdu *cs_resp_pdu)
sgw_ctrl_fteid.teid = cs_resp_pdu->header.teid;
sgw_ctrl_fteid.ipv4 = 0; //FIXME This is not used for now. In the future it will be obtained from the socket addr_info
//Get S-GW S1-u F-TEID
if (cs_resp->eps_bearer_context_created.s1_u_sgw_f_teid_present == false){
m_mme_gtpc_log->error("Did not receive SGW S1-U F-TEID in create session response\n");
return;
}
m_mme_gtpc_log->console("Create Session Response -- SPGW control TEID %d\n", sgw_ctrl_fteid.teid);
in_addr s1u_addr;
s1u_addr.s_addr = cs_resp->eps_bearer_context_created.s1_u_sgw_f_teid.ipv4;
m_mme_gtpc_log->console("Create Session Response -- SPGW S1-U Address: %s\n", inet_ntoa(s1u_addr));
m_s1ap->m_s1ap_ctx_mngmt_proc->send_initial_context_setup_request(mme_s1ap_id, cs_resp, sgw_ctrl_fteid);
//Check UE Ipv4 address was allocated
if(cs_resp->paa_present != true)
{
m_mme_gtpc_log->error("PDN Adress Allocation not present\n");
return;
}
if(cs_resp->paa.pdn_type != srslte::GTPC_PDN_TYPE_IPV4)
{
m_mme_gtpc_log->error("IPv6 not supported yet\n");
return;
}
//Save create session response info to E-RAB context
ue_ecm_ctx_t *ecm_ctx = m_s1ap->find_ue_ecm_ctx_from_mme_ue_s1ap_id(mme_s1ap_id);
if(ecm_ctx ==NULL)
{
m_mme_gtpc_log->error("Could not find UE ECM context\n");
return;
}
ue_emm_ctx_t *emm_ctx = m_s1ap->find_ue_emm_ctx_from_imsi(ecm_ctx->imsi);
if(emm_ctx ==NULL)
{
m_mme_gtpc_log->error("Could not find UE EMM context\n");
return;
}
//Set EPS bearer context
//FIXME default EPS bearer is hard-coded
int default_bearer=5;
erab_ctx_t *erab_ctx = &ecm_ctx->erabs_ctx[default_bearer];
erab_ctx->pdn_addr_alloc= cs_resp->paa;
erab_ctx->sgw_ctrl_fteid = sgw_ctrl_fteid;
erab_ctx->sgw_s1u_fteid = cs_resp->eps_bearer_context_created.s1_u_sgw_f_teid;
m_s1ap->m_s1ap_ctx_mngmt_proc->send_initial_context_setup_request(emm_ctx, ecm_ctx, erab_ctx);
}

53
srsepc/src/mme/s1ap_ctx_mngmt_proc.cc
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@ -79,10 +79,7 @@ s1ap_ctx_mngmt_proc::init(void)
bool
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)
erab_ctx_t *erab_ctx)
{
int s1mme = m_s1ap->get_s1_mme();
@ -97,7 +94,7 @@ s1ap_ctx_mngmt_proc::send_initial_context_setup_request(ue_emm_ctx_t *emm_ctx,
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
LIBLTE_S1AP_E_RABTOBESETUPITEMCTXTSUREQ_STRUCT *erab_ctx_req = &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");
@ -112,28 +109,28 @@ s1ap_ctx_mngmt_proc::send_initial_context_setup_request(ue_emm_ctx_t *emm_ctx,
//Setup eRAB context
in_ctxt_req->E_RABToBeSetupListCtxtSUReq.len = 1;
erab_ctxt->e_RAB_ID.E_RAB_ID = erab_id;
erab_ctx_req->e_RAB_ID.E_RAB_ID = erab_ctx->erab_id;
//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_ctx_req->e_RABlevelQoSParameters.qCI.QCI = 9;
erab_ctx_req->e_RABlevelQoSParameters.allocationRetentionPriority.priorityLevel.PriorityLevel = 15 ;//Lowest
erab_ctx_req->e_RABlevelQoSParameters.allocationRetentionPriority.pre_emptionCapability = LIBLTE_S1AP_PRE_EMPTIONCAPABILITY_SHALL_NOT_TRIGGER_PRE_EMPTION;
erab_ctx_req->e_RABlevelQoSParameters.allocationRetentionPriority.pre_emptionVulnerability = LIBLTE_S1AP_PRE_EMPTIONVULNERABILITY_PRE_EMPTABLE;
erab_ctxt->e_RABlevelQoSParameters.gbrQosInformation_present=false;
erab_ctx_req->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(sgw_s1u_fteid.ipv4);
erab_ctx_req->transportLayerAddress.n_bits = 32; //IPv4
uint32_t sgw_s1u_ip = htonl(erab_ctx->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;
uint8_t *tmp_ptr = erab_ctx_req->transportLayerAddress.buffer;
liblte_value_2_bits(sgw_s1u_ip, &tmp_ptr, 32);//FIXME consider ipv6
uint32_t sgw_s1u_teid = sgw_s1u_fteid.teid;
memcpy(erab_ctxt->gTP_TEID.buffer, &sgw_s1u_teid, sizeof(uint32_t));
uint32_t sgw_s1u_teid = erab_ctx->sgw_s1u_fteid.teid;
memcpy(erab_ctx_req->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);
@ -156,25 +153,13 @@ s1ap_ctx_mngmt_proc::send_initial_context_setup_request(ue_emm_ctx_t *emm_ctx,
{
in_ctxt_req->UESecurityCapabilities.integrityProtectionAlgorithms.buffer[i] = 0; //EEA not supported
}
// in_ctxt_req->UESecurityCapabilities.integrityProtectionAlgorithms.buffer[0] = 1; //EIA1
}
//Get K eNB
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("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(emm_ctx, ecm_ctx, erab_ctxt, &pdn_addr_alloc, nas_buffer);
m_s1ap_nas_transport->pack_attach_accept(emm_ctx, ecm_ctx, erab_ctx_req, &erab_ctx->pdn_addr_alloc, nas_buffer);
LIBLTE_ERROR_ENUM err = liblte_s1ap_pack_s1ap_pdu(&pdu, (LIBLTE_BYTE_MSG_STRUCT*)reply_buffer);
@ -192,15 +177,15 @@ s1ap_ctx_mngmt_proc::send_initial_context_setup_request(ue_emm_ctx_t *emm_ctx,
}
//Change E-RAB state to Context Setup Requested and save S-GW control F-TEID
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;
ecm_ctx->erabs_ctx[erab_ctx_req->e_RAB_ID.E_RAB_ID].state = ERAB_CTX_REQUESTED;
//ecm_ctx->erabs_ctx[erab_ctx_req->e_RAB_ID.E_RAB_ID].sgw_ctrl_fteid.teid = sgw_ctrl_fteid.teid;
//ecm_ctx->erabs_ctx[erab_ctx_req->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("Sent Intial Context Setup Request. E-RAB id %d \n",erab_ctx_req->e_RAB_ID.E_RAB_ID);
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("Sent Intial Context Setup Request, E-RAB id %d\n",erab_ctx_req->e_RAB_ID.E_RAB_ID);
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);

8
srsepc/src/mme/s1ap_nas_transport.cc
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@ -630,13 +630,17 @@ s1ap_nas_transport::handle_nas_service_request(uint32_t m_tmsi,
{
//Service request to Connected UE.
//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);
m_s1ap->m_s1ap_ctx_mngmt_proc->send_initial_context_setup_request(ecm_ctx);
int default_bearer_id = 5;
m_s1ap->m_s1ap_ctx_mngmt_proc->send_initial_context_setup_request(ue_emm_ctx, ecm_ctx, &ecm_ctx->erabs_ctx[default_bearer_id]);
}
else
{
//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");
}
}
else