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[MME] Add Purge-UE Capability (#1991)

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* [MME] Add Purge-UE Capability

* Add OGS_GTP_..._PURGE_AND_REMOVE to split CLR case
This commit is contained in:
jmasterfunk84
2023-01-13 18:13:48 -06:00
committed by GitHub
parent 5128ebc6c6
commit 3fd7ecc9a2
14 changed files with 372 additions and 26 deletions
Download Patch File Download Diff File Expand all files Collapse all files

10
lib/diameter/s6a/message.h
View File

@@ -59,9 +59,6 @@ extern "C" {
#define OGS_DIAM_S6A_ULR_INITIAL_ATTACH_IND (1 << 5)
#define OGS_DIAM_S6A_ULR_PS_LCS_SUPPORTED_BY_UE (1 << 6)
#define OGS_DIAM_S6A_PUA_FLAGS_FREEZE_MTMSI (1)
#define OGS_DIAM_S6A_PUA_FLAGS_FREEZE_PTMSI (1 << 1)
#define OGS_DIAM_S6A_UE_SRVCC_NOT_SUPPORTED (0)
#define OGS_DIAM_S6A_UE_SRVCC_SUPPORTED (1)
@@ -175,6 +172,12 @@ typedef struct ogs_diam_s6a_ula_message_s {
ogs_subscription_data_t subscription_data;
} ogs_diam_s6a_ula_message_t;
typedef struct ogs_diam_s6a_pua_message_s {
#define OGS_DIAM_S6A_PUA_FLAGS_FREEZE_MTMSI (1)
#define OGS_DIAM_S6A_PUA_FLAGS_FREEZE_PTMSI (1 << 1)
uint32_t pua_flags;
} ogs_diam_s6a_pua_message_t;
typedef struct ogs_diam_s6a_clr_message_s {
#define OGS_DIAM_S6A_CLR_FLAGS_S6A_S6D_INDICATOR (1)
#define OGS_DIAM_S6A_CLR_FLAGS_REATTACH_REQUIRED (1 << 1)
@@ -221,6 +224,7 @@ typedef struct ogs_diam_s6a_message_s {
ogs_diam_s6a_clr_message_t clr_message;
ogs_diam_s6a_aia_message_t aia_message;
ogs_diam_s6a_ula_message_t ula_message;
ogs_diam_s6a_pua_message_t pua_message;
} ogs_diam_s6a_message_t;
int ogs_diam_s6a_init(void);

9
lib/gtp/xact.h
View File

@@ -101,10 +101,11 @@ typedef struct ogs_gtp_xact_s {
#define OGS_GTP_DELETE_SEND_DETACH_ACCEPT 3
#define OGS_GTP_DELETE_SEND_DEACTIVATE_BEARER_CONTEXT_REQUEST 4
#define OGS_GTP_DELETE_SEND_RELEASE_WITH_UE_CONTEXT_REMOVE 5
#define OGS_GTP_DELETE_SEND_RELEASE_WITH_S1_REMOVE_AND_UNLINK 6
#define OGS_GTP_DELETE_HANDLE_PDN_CONNECTIVITY_REQUEST 7
#define OGS_GTP_DELETE_UE_CONTEXT_REMOVE_PARTIAL 8
#define OGS_GTP_DELETE_IN_PATH_SWITCH_REQUEST 9
#define OGS_GTP_DELETE_SEND_RELEASE_WITH_UE_CONTEXT_PURGE_AND_REMOVE 6
#define OGS_GTP_DELETE_SEND_RELEASE_WITH_S1_REMOVE_AND_UNLINK 7
#define OGS_GTP_DELETE_HANDLE_PDN_CONNECTIVITY_REQUEST 8
#define OGS_GTP_DELETE_UE_CONTEXT_REMOVE_PARTIAL 9
#define OGS_GTP_DELETE_IN_PATH_SWITCH_REQUEST 10
int delete_action;

4
src/mme/esm-sm.c
View File

@@ -145,7 +145,7 @@ void esm_state_inactive(ogs_fsm_t *s, mme_event_t *e)
ogs_assert(OGS_OK ==
s1ap_send_ue_context_release_command(mme_ue->enb_ue,
S1AP_Cause_PR_nas, S1AP_CauseNas_normal_release,
S1AP_UE_CTX_REL_UE_CONTEXT_REMOVE, 0));
S1AP_UE_CTX_REL_UE_CONTEXT_PURGE_AND_REMOVE, 0));
OGS_FSM_TRAN(s, &esm_state_exception);
break;
}
@@ -160,7 +160,7 @@ void esm_state_inactive(ogs_fsm_t *s, mme_event_t *e)
ogs_assert(OGS_OK ==
s1ap_send_ue_context_release_command(mme_ue->enb_ue,
S1AP_Cause_PR_nas, S1AP_CauseNas_normal_release,
S1AP_UE_CTX_REL_UE_CONTEXT_REMOVE, 0));
S1AP_UE_CTX_REL_UE_CONTEXT_PURGE_AND_REMOVE, 0));
OGS_FSM_TRAN(s, &esm_state_exception);
break;
}

9
src/mme/mme-context.h
View File

@@ -262,10 +262,11 @@ struct enb_ue_s {
#define S1AP_UE_CTX_REL_S1_CONTEXT_REMOVE 1
#define S1AP_UE_CTX_REL_S1_REMOVE_AND_UNLINK 2
#define S1AP_UE_CTX_REL_UE_CONTEXT_REMOVE 3
#define S1AP_UE_CTX_REL_S1_HANDOVER_COMPLETE 4
#define S1AP_UE_CTX_REL_S1_HANDOVER_CANCEL 5
#define S1AP_UE_CTX_REL_S1_HANDOVER_FAILURE 6
#define S1AP_UE_CTX_REL_S1_PAGING 7
#define S1AP_UE_CTX_REL_UE_CONTEXT_PURGE_AND_REMOVE 4
#define S1AP_UE_CTX_REL_S1_HANDOVER_COMPLETE 5
#define S1AP_UE_CTX_REL_S1_HANDOVER_CANCEL 6
#define S1AP_UE_CTX_REL_S1_HANDOVER_FAILURE 7
#define S1AP_UE_CTX_REL_S1_PAGING 8
uint8_t ue_ctx_rel_action;
bool part_of_s1_reset_requested;

284
src/mme/mme-fd-path.c
View File

@@ -40,6 +40,7 @@ struct sess_state {
static void mme_s6a_aia_cb(void *data, struct msg **msg);
static void mme_s6a_ula_cb(void *data, struct msg **msg);
static void mme_s6a_pua_cb(void *data, struct msg **msg);
static void state_cleanup(struct sess_state *sess_data, os0_t sid, void *opaque)
{
@@ -1218,6 +1219,98 @@ void mme_s6a_send_ulr(mme_ue_t *mme_ue)
ogs_assert(pthread_mutex_unlock(&ogs_diam_logger_self()->stats_lock) == 0);
}
/* MME Sends Purge UE Request to HSS */
void mme_s6a_send_pur(mme_ue_t *mme_ue)
{
int ret;
struct msg *req = NULL;
struct avp *avp;
union avp_value val;
struct sess_state *sess_data = NULL, *svg;
struct session *session = NULL;
ogs_assert(mme_ue);
ogs_debug("[MME] Purge-UE-Request");
/* Create the random value to store with the session */
sess_data = ogs_calloc(1, sizeof(*sess_data));
ogs_assert(sess_data);
sess_data->mme_ue = mme_ue;
/* Create the request */
ret = fd_msg_new(ogs_diam_s6a_cmd_pur, MSGFL_ALLOC_ETEID, &req);
ogs_assert(ret == 0);
/* Create a new session */
#define OGS_DIAM_S6A_APP_SID_OPT "app_s6a"
ret = fd_msg_new_session(req, (os0_t)OGS_DIAM_S6A_APP_SID_OPT,
CONSTSTRLEN(OGS_DIAM_S6A_APP_SID_OPT));
ogs_assert(ret == 0);
ret = fd_msg_sess_get(fd_g_config->cnf_dict, req, &session, NULL);
ogs_assert(ret == 0);
/* Set the Auth-Session-State AVP */
ret = fd_msg_avp_new(ogs_diam_auth_session_state, 0, &avp);
ogs_assert(ret == 0);
val.i32 = OGS_DIAM_AUTH_SESSION_NO_STATE_MAINTAINED;
ret = fd_msg_avp_setvalue(avp, &val);
ogs_assert(ret == 0);
ret = fd_msg_avp_add(req, MSG_BRW_LAST_CHILD, avp);
ogs_assert(ret == 0);
/* Set Origin-Host & Origin-Realm */
ret = fd_msg_add_origin(req, 0);
ogs_assert(ret == 0);
/* Set the Destination-Realm AVP */
ret = fd_msg_avp_new(ogs_diam_destination_realm, 0, &avp);
ogs_assert(ret == 0);
val.os.data = (unsigned char *)(fd_g_config->cnf_diamrlm);
val.os.len = strlen(fd_g_config->cnf_diamrlm);
ret = fd_msg_avp_setvalue(avp, &val);
ogs_assert(ret == 0);
ret = fd_msg_avp_add(req, MSG_BRW_LAST_CHILD, avp);
ogs_assert(ret == 0);
/* Set the User-Name AVP */
ret = fd_msg_avp_new(ogs_diam_user_name, 0, &avp);
ogs_assert(ret == 0);
val.os.data = (uint8_t *)mme_ue->imsi_bcd;
val.os.len = strlen(mme_ue->imsi_bcd);
ret = fd_msg_avp_setvalue(avp, &val);
ogs_assert(ret == 0);
ret = fd_msg_avp_add(req, MSG_BRW_LAST_CHILD, avp);
ogs_assert(ret == 0);
/* Set Vendor-Specific-Application-Id AVP */
ret = ogs_diam_message_vendor_specific_appid_set(
req, OGS_DIAM_S6A_APPLICATION_ID);
ogs_assert(ret == 0);
ret = clock_gettime(CLOCK_REALTIME, &sess_data->ts);
ogs_assert(ret == 0);
/* Keep a pointer to the session data for debug purpose,
* in real life we would not need it */
svg = sess_data;
/* Store this value in the session */
ret = fd_sess_state_store(mme_s6a_reg, session, &sess_data);
ogs_assert(ret == 0);
ogs_assert(sess_data == 0);
/* Send the request */
ret = fd_msg_send(&req, mme_s6a_pua_cb, svg);
ogs_assert(ret == 0);
/* Increment the counter */
ogs_assert(pthread_mutex_lock(&ogs_diam_logger_self()->stats_lock) == 0);
ogs_diam_logger_self()->stats.nb_sent++;
ogs_assert(pthread_mutex_unlock(&ogs_diam_logger_self()->stats_lock) == 0);
}
/* MME received Update Location Answer from HSS */
static void mme_s6a_ula_cb(void *data, struct msg **msg)
{
@@ -1456,6 +1549,197 @@ static void mme_s6a_ula_cb(void *data, struct msg **msg)
return;
}
/* MME received Purge UE Answer from HSS */
static void mme_s6a_pua_cb(void *data, struct msg **msg)
{
int ret;
struct sess_state *sess_data = NULL;
struct timespec ts;
struct session *session;
struct avp *avp, *avpch;
struct avp_hdr *hdr;
unsigned long dur;
int error = 0;
int new;
mme_event_t *e = NULL;
mme_ue_t *mme_ue = NULL;
ogs_diam_s6a_message_t *s6a_message = NULL;
ogs_diam_s6a_pua_message_t *pua_message = NULL;
ogs_debug("[MME] Purge-UE-Answer");
ret = clock_gettime(CLOCK_REALTIME, &ts);
ogs_assert(ret == 0);
/* Search the session, retrieve its data */
ret = fd_msg_sess_get(fd_g_config->cnf_dict, *msg, &session, &new);
ogs_expect_or_return(ret == 0);
ogs_expect_or_return(new == 0);
ret = fd_sess_state_retrieve(mme_s6a_reg, session, &sess_data);
ogs_expect_or_return(ret == 0);
ogs_expect_or_return(sess_data);
ogs_expect_or_return((void *)sess_data == data);
mme_ue = sess_data->mme_ue;
ogs_assert(mme_ue);
/* Set Purge-UE Command */
s6a_message = ogs_calloc(1, sizeof(ogs_diam_s6a_message_t));
ogs_assert(s6a_message);
s6a_message->cmd_code = OGS_DIAM_S6A_CMD_CODE_PURGE_UE;
pua_message = &s6a_message->pua_message;
ogs_assert(pua_message);
/* AVP: 'Result-Code'(268)
* The Result-Code AVP indicates whether a particular request was completed
* successfully or whether an error occurred. The Result-Code data field
* contains an IANA-managed 32-bit address space representing errors.
* Reference: RFC 6733
*/
ret = fd_msg_search_avp(*msg, ogs_diam_result_code, &avp);
ogs_assert(ret == 0);
if (avp) {
ret = fd_msg_avp_hdr(avp, &hdr);
ogs_assert(ret == 0);
s6a_message->result_code = hdr->avp_value->i32;
s6a_message->err = &s6a_message->result_code;
ogs_debug(" Result Code: %d", hdr->avp_value->i32);
} else {
ret = fd_msg_search_avp(*msg, ogs_diam_experimental_result, &avp);
ogs_assert(ret == 0);
if (avp) {
ret = fd_avp_search_avp(avp,
ogs_diam_experimental_result_code, &avpch);
ogs_assert(ret == 0);
if (avpch) {
ret = fd_msg_avp_hdr(avpch, &hdr);
ogs_assert(ret == 0);
s6a_message->result_code = hdr->avp_value->i32;
s6a_message->exp_err = &s6a_message->result_code;
ogs_debug(" Experimental Result Code: %d",
s6a_message->result_code);
}
} else {
ogs_error("no Result-Code");
error++;
}
}
/* AVP: 'Origin-Host'(264)
* The Origin-Host AVP identifies the endpoint that originated the Diameter
* message. Relay agents MUST NOT modify this AVP. The value of the
* Origin-Host AVP is guaranteed to be unique within a single host.
* Reference: RFC 6733
*/
ret = fd_msg_search_avp(*msg, ogs_diam_origin_host, &avp);
ogs_assert(ret == 0);
if (avp) {
ret = fd_msg_avp_hdr(avp, &hdr);
ogs_assert(ret == 0);
ogs_debug(" From '%.*s'",
(int)hdr->avp_value->os.len, hdr->avp_value->os.data);
} else {
ogs_error("no_Origin-Host");
error++;
}
/* AVP: 'Origin-Realm'(296)
* This AVP contains the Realm of the originator of any Diameter message
* and MUST be present in all messages. This AVP SHOULD be placed as close
* to the Diameter header as possible.
* Reference: RFC 6733
*/
ret = fd_msg_search_avp(*msg, ogs_diam_origin_realm, &avp);
ogs_assert(ret == 0);
if (avp) {
ret = fd_msg_avp_hdr(avp, &hdr);
ogs_assert(ret == 0);
ogs_debug(" ('%.*s')",
(int)hdr->avp_value->os.len, hdr->avp_value->os.data);
} else {
ogs_error("no_Origin-Realm");
error++;
}
/* AVP: 'PUA-Flags'(1406)
* The PUA-Flags AVP contains a bit mask, whose meanings are defined in
* table in 29.272 7.3.8/1.
* Reference: 3GPP TS 29.272-f70
*/
ret = fd_msg_search_avp(*msg, ogs_diam_s6a_pua_flags, &avp);
ogs_assert(ret == 0);
if (avp) {
ret = fd_msg_avp_hdr(avp, &hdr);
ogs_assert(ret == 0);
pua_message->pua_flags = hdr->avp_value->i32;
}
if (!error) {
int rv;
e = mme_event_new(MME_EVENT_S6A_MESSAGE);
ogs_assert(e);
e->mme_ue = mme_ue;
e->s6a_message = s6a_message;
rv = ogs_queue_push(ogs_app()->queue, e);
if (rv != OGS_OK) {
ogs_error("ogs_queue_push() failed:%d", (int)rv);
ogs_free(s6a_message);
mme_event_free(e);
} else {
ogs_pollset_notify(ogs_app()->pollset);
}
} else {
ogs_free(s6a_message);
}
/* Free the message */
ogs_assert(pthread_mutex_lock(&ogs_diam_logger_self()->stats_lock) == 0);
dur = ((ts.tv_sec - sess_data->ts.tv_sec) * 1000000) +
((ts.tv_nsec - sess_data->ts.tv_nsec) / 1000);
if (ogs_diam_logger_self()->stats.nb_recv) {
/* Ponderate in the avg */
ogs_diam_logger_self()->stats.avg =
(ogs_diam_logger_self()->stats.avg *
ogs_diam_logger_self()->stats.nb_recv + dur) /
(ogs_diam_logger_self()->stats.nb_recv + 1);
/* Min, max */
if (dur < ogs_diam_logger_self()->stats.shortest)
ogs_diam_logger_self()->stats.shortest = dur;
if (dur > ogs_diam_logger_self()->stats.longest)
ogs_diam_logger_self()->stats.longest = dur;
} else {
ogs_diam_logger_self()->stats.shortest = dur;
ogs_diam_logger_self()->stats.longest = dur;
ogs_diam_logger_self()->stats.avg = dur;
}
if (error)
ogs_diam_logger_self()->stats.nb_errs++;
else
ogs_diam_logger_self()->stats.nb_recv++;
ogs_assert(pthread_mutex_unlock(&ogs_diam_logger_self()->stats_lock) == 0);
/* Display how long it took */
if (ts.tv_nsec > sess_data->ts.tv_nsec)
ogs_trace("in %d.%06ld sec",
(int)(ts.tv_sec - sess_data->ts.tv_sec),
(long)(ts.tv_nsec - sess_data->ts.tv_nsec) / 1000);
else
ogs_trace("in %d.%06ld sec",
(int)(ts.tv_sec + 1 - sess_data->ts.tv_sec),
(long)(1000000000 + ts.tv_nsec - sess_data->ts.tv_nsec) / 1000);
ret = fd_msg_free(*msg);
ogs_assert(ret == 0);
*msg = NULL;
state_cleanup(sess_data, NULL, NULL);
return;
}
/* Callback for incoming Cancel-Location-Request messages */
static int mme_ogs_diam_s6a_clr_cb( struct msg **msg, struct avp *avp,
struct session *session, void *opaque, enum disp_action *act)

2
src/mme/mme-fd-path.h
View File

@@ -35,6 +35,8 @@ void mme_s6a_send_air(mme_ue_t *mme_ue,
*authentication_failure_parameter);
/* MME Sends Update Location Request to HSS */
void mme_s6a_send_ulr(mme_ue_t *mme_ue);
/* MME Sends Purge UE Request to HSS */
void mme_s6a_send_pur(mme_ue_t *mme_ue);
#ifdef __cplusplus
}

2
src/mme/mme-gtp-path.c
View File

@@ -134,7 +134,7 @@ static void timeout(ogs_gtp_xact_t *xact, void *data)
ogs_assert(OGS_OK ==
s1ap_send_ue_context_release_command(enb_ue,
S1AP_Cause_PR_nas, S1AP_CauseNas_normal_release,
S1AP_UE_CTX_REL_UE_CONTEXT_REMOVE, 0));
S1AP_UE_CTX_REL_UE_CONTEXT_PURGE_AND_REMOVE, 0));
} else {
ogs_warn("No S1 Context");
}

2
src/mme/mme-path.c
View File

@@ -98,7 +98,7 @@ void mme_send_delete_session_or_mme_ue_context_release(mme_ue_t *mme_ue)
if (SESSION_CONTEXT_IS_AVAILABLE(mme_ue)) {
mme_gtp_send_delete_all_sessions(mme_ue,
OGS_GTP_DELETE_SEND_RELEASE_WITH_UE_CONTEXT_REMOVE);
OGS_GTP_DELETE_SEND_RELEASE_WITH_UE_CONTEXT_PURGE_AND_REMOVE);
} else {
enb_ue_t *enb_ue = enb_ue_cycle(mme_ue->enb_ue);
if (enb_ue) {

14
src/mme/mme-s11-handler.c
View File

@@ -634,6 +634,20 @@ void mme_s11_handle_delete_session_response(
}
}
} else if (action ==
OGS_GTP_DELETE_SEND_RELEASE_WITH_UE_CONTEXT_PURGE_AND_REMOVE) {
if (mme_sess_count(mme_ue) == 1) /* Last Session */ {
if (ECM_IDLE(mme_ue)) {
mme_s6a_send_pur(mme_ue);
} else {
ogs_assert(mme_ue->enb_ue);
ogs_assert(OGS_OK ==
s1ap_send_ue_context_release_command(mme_ue->enb_ue,
S1AP_Cause_PR_nas, S1AP_CauseNas_normal_release,
S1AP_UE_CTX_REL_UE_CONTEXT_PURGE_AND_REMOVE, 0));
}
}
} else if (action ==
OGS_GTP_DELETE_SEND_RELEASE_WITH_S1_REMOVE_AND_UNLINK) {
if (mme_sess_count(mme_ue) == 1) /* Last Session */ {

27
src/mme/mme-s6a-handler.c
View File

@@ -126,6 +126,33 @@ uint8_t mme_s6a_handle_ula(
return OGS_NAS_EMM_CAUSE_REQUEST_ACCEPTED;
}
uint8_t mme_s6a_handle_pua(
mme_ue_t *mme_ue, ogs_diam_s6a_message_t *s6a_message)
{
ogs_diam_s6a_pua_message_t *pua_message = NULL;
ogs_assert(mme_ue);
ogs_assert(s6a_message);
pua_message = &s6a_message->pua_message;
ogs_assert(pua_message);
if (s6a_message->result_code != ER_DIAMETER_SUCCESS) {
ogs_error("Purge UE failed for IMSI[%s] [%d]", mme_ue->imsi_bcd,
s6a_message->result_code);
mme_ue_hash_remove(mme_ue);
mme_ue_remove(mme_ue);
return OGS_ERROR;
}
if (pua_message->pua_flags & OGS_DIAM_S6A_PUA_FLAGS_FREEZE_MTMSI)
ogs_debug("Freeze M-TMSI requested but not implemented.");
mme_ue_hash_remove(mme_ue);
mme_ue_remove(mme_ue);
return OGS_OK;
}
uint8_t mme_s6a_handle_idr(
mme_ue_t *mme_ue, ogs_diam_s6a_message_t *s6a_message)
{

2
src/mme/mme-s6a-handler.h
View File

@@ -30,6 +30,8 @@ uint8_t mme_s6a_handle_aia(
mme_ue_t *mme_ue, ogs_diam_s6a_message_t *s6a_message);
uint8_t mme_s6a_handle_ula(
mme_ue_t *mme_ue, ogs_diam_s6a_message_t *s6a_message);
uint8_t mme_s6a_handle_pua(
mme_ue_t *mme_ue, ogs_diam_s6a_message_t *s6a_message);
uint8_t mme_s6a_handle_idr(
mme_ue_t *mme_ue, ogs_diam_s6a_message_t *s6a_message);
void mme_s6a_handle_clr(

5
src/mme/mme-sm.c
View File

@@ -436,9 +436,12 @@ void mme_state_operational(ogs_fsm_t *s, mme_event_t *e)
ogs_assert(OGS_OK ==
s1ap_send_ue_context_release_command(enb_ue,
S1AP_Cause_PR_nas, S1AP_CauseNas_normal_release,
S1AP_UE_CTX_REL_UE_CONTEXT_REMOVE, 0));
S1AP_UE_CTX_REL_UE_CONTEXT_PURGE_AND_REMOVE, 0));
}
break;
case OGS_DIAM_S6A_CMD_CODE_PURGE_UE:
mme_s6a_handle_pua(mme_ue, s6a_message);
break;
case OGS_DIAM_S6A_CMD_CODE_CANCEL_LOCATION:
mme_s6a_handle_clr(mme_ue, s6a_message);
break;

2
src/mme/nas-path.c
View File

@@ -346,7 +346,7 @@ int nas_eps_send_pdn_connectivity_reject(
ogs_assert(OGS_OK ==
s1ap_send_ue_context_release_command(mme_ue->enb_ue,
S1AP_Cause_PR_nas, S1AP_CauseNas_normal_release,
S1AP_UE_CTX_REL_UE_CONTEXT_REMOVE, 0));
S1AP_UE_CTX_REL_UE_CONTEXT_PURGE_AND_REMOVE, 0));
}
} else {
esmbuf = esm_build_pdn_connectivity_reject(

8
src/mme/s1ap-handler.c
View File

@@ -22,6 +22,7 @@
#include "s1ap-path.h"
#include "nas-path.h"
#include "mme-fd-path.h"
#include "mme-gtp-path.h"
#include "sgsap-types.h"
#include "sgsap-path.h"
@@ -1487,6 +1488,13 @@ void s1ap_handle_ue_context_release_action(enb_ue_t *enb_ue)
mme_ue_hash_remove(mme_ue);
mme_ue_remove(mme_ue);
break;
case S1AP_UE_CTX_REL_UE_CONTEXT_PURGE_AND_REMOVE:
ogs_debug(" Action: UE context remove");
enb_ue_remove(enb_ue);
ogs_expect_or_return(mme_ue);
mme_s6a_send_pur(mme_ue);
break;
case S1AP_UE_CTX_REL_S1_HANDOVER_COMPLETE:
ogs_debug(" Action: S1 handover complete");