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Add Attach-Request handler in all EMM state. 

If signal is low, UE cannot send an appropriate NAS message.

In this case, the eNB either sends a NASNonDelivery message or
sends the message back according to UE's NAS timer.

At this point, NextEPC did not implement NAS-Specification exactly. The
NASNonDelivery message will be ignored, and a timer of NAS is not yet in
need.

However, since necessary to recover, it is now implemented to
accept an Attach Request in all EMM state. The other features will be
added later if we decide that it is really necessary.
This commit is contained in:
Sukchan Lee 2018-08-11 12:27:50 +09:00
parent 0a93c886ad
commit 295213dd62
1 changed files with 53 additions and 0 deletions
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53
src/mme/emm_sm.c
View File

@ -457,6 +457,23 @@ void emm_state_authentication(fsm_t *s, event_t *e)
FSM_TRAN(&mme_ue->sm, &emm_state_exception);
break;
}
case NAS_ATTACH_REQUEST:
{
d_warn("[EMM] Attach request", mme_ue->imsi_bcd);
d_trace(3, "[EMM] Attach request\n", mme_ue->imsi_bcd);
rv = emm_handle_attach_request(
mme_ue, &message->emm.attach_request);
if (rv != CORE_OK)
{
d_error("emm_handle_attach_request() failed");
FSM_TRAN(s, emm_state_exception);
return;
}
mme_s6a_send_air(mme_ue, NULL);
FSM_TRAN(s, &emm_state_authentication);
break;
}
case NAS_EMM_STATUS:
{
d_warn("[EMM] EMM STATUS : IMSI[%s] Cause[%d]",
@ -577,6 +594,23 @@ void emm_state_security_mode(fsm_t *s, event_t *e)
FSM_TRAN(s, &emm_state_exception);
break;
}
case NAS_ATTACH_REQUEST:
{
d_warn("[EMM] Attach request", mme_ue->imsi_bcd);
d_trace(3, "[EMM] Attach request\n", mme_ue->imsi_bcd);
rv = emm_handle_attach_request(
mme_ue, &message->emm.attach_request);
if (rv != CORE_OK)
{
d_error("emm_handle_attach_request() failed");
FSM_TRAN(s, emm_state_exception);
return;
}
mme_s6a_send_air(mme_ue, NULL);
FSM_TRAN(s, &emm_state_authentication);
break;
}
case NAS_EMM_STATUS:
{
d_warn("[EMM] EMM STATUS : IMSI[%s] Cause[%d]",
@ -667,6 +701,25 @@ void emm_state_initial_context_setup(fsm_t *s, event_t *e)
FSM_TRAN(s, &emm_state_registered);
break;
}
case NAS_ATTACH_REQUEST:
{
d_warn("[EMM] Attach request", mme_ue->imsi_bcd);
d_trace(3, "[EMM] Attach request\n", mme_ue->imsi_bcd);
rv = emm_handle_attach_request(
mme_ue, &message->emm.attach_request);
if (rv != CORE_OK)
{
d_error("emm_handle_attach_request() failed");
FSM_TRAN(s, emm_state_exception);
return;
}
rv = mme_gtp_send_delete_all_sessions(mme_ue);
d_assert(rv == CORE_OK,,
"mme_gtp_send_delete_all_sessions() failed");
FSM_TRAN(s, &emm_state_authentication);
break;
}
case NAS_EMM_STATUS:
{
d_warn("[EMM] EMM STATUS : IMSI[%s] Cause[%d]",