void
recv_callback (
uint8_t * buffer,
uint32_t length)
{
uint8_t *bufferS;
uint32_t len;
s1ap_eNB_generate_initial_ue_message (&bufferS, &len);
sctp_send_msg (assoc[0], 1, bufferS, len);
}
int s1ap_eNB_new_data_request(uint8_t eNB_id, uint8_t ue_id, uint8_t *buffer, uint32_t length) {
s1ap_message message;
struct s1ap_eNB_UE_description_s *ue_ref;
struct s1ap_eNB_description_s *eNB_ref;
/* If we don't found the eNB as S1 associated, this may indicate that no S1 Setup Request has been sent,
* or S1 Setup has failed.
*/
if ((eNB_ref = s1ap_get_eNB_eNB_id(eNB_id)) == NULL) {
S1AP_ERROR("This eNB (%d) has no known S1 association with any MME\n", eNB_id);
return -1;
}
///TODO: Check if eNB is associated to a MME
/* Searching for UE in eNB.
* If we failed founding it, request a new initial UE message to MME.
*/
if ((ue_ref = s1ap_get_ue_id_pair(eNB_id, ue_id)) == NULL) {
if ((ue_ref = s1ap_UE_add_new(eNB_ref)) == NULL) {
/* We failed to allocate a new UE in list */
S1AP_ERROR("Failed to allocate new UE description for UE %d attached to eNB %d\n",
ue_id, eNB_id);
return -1;
}
ue_ref->eNB_UE_s1ap_id = ue_id;
/* MME UE S1AP ID is allocated by MME, waiting for Initial Context Setup Request Message
* before setting it.
*/
ue_ref->mme_UE_s1ap_id = 0;
ue_ref->eNB->nextstream++;
/* Do we reached max number of output streams ?.
* If so wrap to 1.
*/
if (ue_ref->eNB->nextstream == ue_ref->eNB->outstreams)
ue_ref->eNB->nextstream = 1;
/* Set the output stream that will be used for this UE */
ue_ref->stream_send = ue_ref->eNB->nextstream;
S1AP_ERROR("Sending Initial UE message for UE %d on eNB %d\n",
ue_id, eNB_id);
return s1ap_eNB_generate_initial_ue_message(ue_ref, buffer, length);
} else {
/* UE is already associated to a valid Context.
* Consider request as Uplink NAS transport.
*/
S1AP_ERROR("Sending Uplink NAS transport message for UE %d on eNB %d\n",
ue_id, eNB_id);
return s1ap_eNB_generate_uplink_nas_transport(ue_ref, buffer, length);
}
}
