x2ap/sctp: increase buffer size

The 5G phone OPPO has a very big UE capability (> 2KB).

We need bigger buffers to transfer this, especially in x2 handover.

Also the sctp messages need a bigger buffer.

Note: in sctp, we didn't check for partial messages, it's now
      done. When detected, we exit. To be redone differently
      if needed. (Look for "if (!(flags & MSG_EOR))".)

openair2/COMMON/x2ap_messages_types.h

@@ -205,7 +205,7 @@ typedef struct x2ap_handover_req_s {
 
   x2ap_lastvisitedcell_info_t lastvisitedcell_info;
 
-  uint8_t rrc_buffer[1024 /* arbitrary, big enough */];
+  uint8_t rrc_buffer[8192 /* arbitrary, big enough */];
   int rrc_buffer_size;
 
   int target_assoc_id;

openair2/RRC/LTE/rrc_eNB.c

@@ -4614,10 +4614,10 @@ rrc_eNB_generate_HandoverPreparationInformation(
   uint8_t                     *buffer,
   int                          *_size
 ) {
-  memset(buffer, 0, RRC_BUF_SIZE);
+  memset(buffer, 0, 8192);
   char *ho_buf = (char *) buffer;
   int ho_size;
-  ho_size = do_HandoverPreparation(ho_buf, 1024, ue_context_pP->ue_context.UE_Capability, ue_context_pP->ue_context.UE_Capability_size);
+  ho_size = do_HandoverPreparation(ho_buf, 8192, ue_context_pP->ue_context.UE_Capability, ue_context_pP->ue_context.UE_Capability_size);
   *_size = ho_size;
 }
 

openair2/X2AP/x2ap_eNB_handler.c

@@ -730,7 +730,7 @@ int x2ap_eNB_handle_handover_preparation (instance_t instance,
 
   X2AP_RRC_Context_t *c = &ie->value.choice.UE_ContextInformation.rRC_Context;
 
-  if (c->size > 1024 /* TODO: this is the size of rrc_buffer in struct x2ap_handover_req_ack_s*/)
+  if (c->size > 8192 /* TODO: this is the size of rrc_buffer in struct x2ap_handover_req_s */)
     { printf("%s:%d: fatal: buffer too big\n", __FILE__, __LINE__); abort(); }
 
   memcpy(X2AP_HANDOVER_REQ(msg).rrc_buffer, c->buf, c->size);
@@ -821,7 +821,7 @@ int x2ap_eNB_handle_handover_response (instance_t instance,
 
   X2AP_TargeteNBtoSource_eNBTransparentContainer_t *c = &ie->value.choice.TargeteNBtoSource_eNBTransparentContainer;
 
-  if (c->size > 1024 /* TODO: this is the size of rrc_buffer in struct x2ap_handover_req_ack_s*/)
+  if (c->size > 1024 /* TODO: this is the size of rrc_buffer in struct x2ap_handover_req_ack_s */)
     { printf("%s:%d: fatal: buffer too big\n", __FILE__, __LINE__); abort(); }
 
   memcpy(X2AP_HANDOVER_REQ_ACK(msg).rrc_buffer, c->buf, c->size);

openair3/SCTP/sctp_default_values.h

@@ -26,6 +26,6 @@
 #define SCTP_IN_STREAMS         (16)
 #define SCTP_MAX_ATTEMPTS       (2)
 #define SCTP_TIMEOUT            (5)
-#define SCTP_RECV_BUFFER_SIZE   (1024)
+#define SCTP_RECV_BUFFER_SIZE   (8192)
 
 #endif /* SCTP_DEFAULT_VALUES_H_ */

openair3/SCTP/sctp_eNB_task.c

@@ -955,6 +955,11 @@ sctp_eNB_read_from_socket(
         return;
     }
 
+    if (!(flags & MSG_EOR)) {
+      SCTP_ERROR("fatal: partial SCTP messages are not handled\n");
+      exit(1);
+    }
+
     if (flags & MSG_NOTIFICATION) {
         union sctp_notification *snp;
         snp = (union sctp_notification *)buffer;