epdg: Test Handover from Wifi back to LTE
The Handover is informed to the EPDG by the PGW, who sends a
DeleteBearerRequest when receiving an attach from the 3GPP network once
the phone has jumped there.
Related: OS#6046
Change-Id: I299faf28fa51dbc5d2de6c72a39a01eca67a5775
diff --git a/epdg/EPDG_Tests.ttcn b/epdg/EPDG_Tests.ttcn
index e7c8633..99a4721 100644
--- a/epdg/EPDG_Tests.ttcn
+++ b/epdg/EPDG_Tests.ttcn
@@ -112,20 +112,27 @@
};
+type record BearerConfig {
+ /* EPS Bearer ID */
+ uint4_t ebi optional,
+ /* TEI (Data) local side */
+ OCT4 teid_local optional,
+ /* TEI (Data) remote side */
+ OCT4 teid_remote optional
+};
+
type record EPDG_ConnHdlrPars {
hexstring imsi,
charstring apn,
charstring ue_ip,
- /* TEI (Data) local side */
- OCT4 teid,
/* TEI (Control) local side */
- OCT4 teic,
- /* TEI (Data) remote side */
- OCT4 teid_remote optional,
+ OCT4 teic_local,
/* TEI (Control) remote side */
OCT4 teic_remote optional,
+ BearerConfig bearer optional,
+
AuthVector vec optional
};
@@ -146,10 +153,13 @@
imsi := f_gen_imsi(imsi_suffix),
apn := "internet",
ue_ip := "192.168.123.50",
- teid := '00000000'O,
- teic := '00000000'O,
- teid_remote := omit,
+ teic_local := '00000000'O,
teic_remote := omit,
+ bearer := {
+ ebi := omit,
+ teid_local := omit,
+ teid_remote := omit
+ },
vec := f_gen_auth_vec_3g()
};
return pars;
@@ -391,31 +401,34 @@
/* Diameter SWx SAR + SAA. */
private altstep as_GTP2C_CreateSession_success() runs on EPDG_ConnHdlr {
var PDU_GTPCv2 rx_msg;
+ var BearerContextIEs rx_bctx_ies;
var template (value) FullyQualifiedTEID fteid_c_ie, fteid_u_ie;
var template (value) PDN_AddressAllocation paa;
- var uint4_t bid;
var template (value) BearerContextIEs bctx_ies;
[] GTP2.receive(tr_GTP2C_CreateSessionReq(g_pars.imsi)) -> value rx_msg {
- /* TODO: parse TEIC and TEID and store it in g_pars.remote_tei{c,d} */
- bid := rx_msg.gtpcv2_pdu.createSessionRequest.bearerContextGrouped[0].bearerContextIEs.ePS_Bearer_ID.ePS_Bearer_ID_Value;
+ /* Parse TEIC and Bearer EBI and TEID and store it in g_pars */
+ g_pars.teic_remote := rx_msg.gtpcv2_pdu.createSessionRequest.fullyQualifiedTEID[0].tEID_GRE_Key;
+ rx_bctx_ies := rx_msg.gtpcv2_pdu.createSessionRequest.bearerContextGrouped[0].bearerContextIEs;
+ g_pars.bearer.ebi := rx_bctx_ies.ePS_Bearer_ID.ePS_Bearer_ID_Value;
+ g_pars.bearer.teid_remote := rx_bctx_ies.fullyQualifiedTEID[0].tEID_GRE_Key;
/* allocate + register TEID-C on local side */
- g_pars.teic := f_gtp2_allocate_teid();
- g_pars.teid := g_pars.teic;
+ g_pars.teic_local := f_gtp2_allocate_teid();
+ g_pars.bearer.teid_local := g_pars.teic_local;
/* Upon rx of CreateSession, emulate PGW asking the AAA server. */
f_S6b_AA_success();
- fteid_c_ie := ts_GTP2C_FTEID(FTEID_IF_S2b_ePDG_GTPC, g_pars.teic, 0,
+ fteid_c_ie := ts_GTP2C_FTEID(FTEID_IF_S2b_ePDG_GTPC, g_pars.teic_local, 0,
f_inet_addr(mp_s2b_local_ip), omit);
- fteid_u_ie := ts_GTP2C_FTEID(FTEID_IF_S2bU_ePDG_GTPU, g_pars.teid, 2,
+ fteid_u_ie := ts_GTP2C_FTEID(FTEID_IF_S2bU_ePDG_GTPU, g_pars.bearer.teid_local, 2,
f_inet_addr(mp_s2b_local_ip), omit);
paa := ts_GTP2C_PdnAddrAlloc_v4(f_inet_addr(g_pars.ue_ip));
- bctx_ies := ts_GTP2C_BcContextIE(bid := bid,
+ bctx_ies := ts_GTP2C_BcContextIE(ebi := g_pars.bearer.ebi,
teid_list := { fteid_u_ie },
qos := ts_GTP2C_BearerQos('09'O, 0,0,0,0),
- charging_id := ts_GTP2C_ChargingID(g_pars.teic));
+ charging_id := ts_GTP2C_ChargingID(g_pars.teic_local));
GTP2.send(ts_GTP2C_CreateSessionResp({ fteid_c_ie }, paa, { ts_GTP2C_BcGrouped(bctx_ies) } ));
setverdict(pass);
}
@@ -428,6 +441,25 @@
as_GTP2C_CreateSession_success();
}
+/* Expect DeleteBearerResponse */
+private altstep as_GTP2C_DeleteBearer_success() runs on EPDG_ConnHdlr {
+ var PDU_GTPCv2 rx_msg;
+ var template (value) FullyQualifiedTEID fteid_c_ie, fteid_u_ie;
+ var template (value) PDN_AddressAllocation paa;
+
+ [] GTP2.receive(tr_GTP2C_DeleteBearerResp(g_pars.teic_local)) -> value rx_msg {
+ setverdict(pass);
+ }
+ [] GTP2.receive(PDU_GTPCv2:?) -> value rx_msg {
+ Misc_Helpers.f_shutdown(__BFILE__, __LINE__, fail, log2str("Unexpected GTP2C msg rx: ", rx_msg));
+ }
+}
+private function f_GTP2C_DeleteBearer_success() runs on EPDG_ConnHdlr {
+ var integer proc_trans_id := 3;
+ GTP2.send(ts_GTP2C_DeleteBearerReq(g_pars.teic_remote, proc_trans_id, g_pars.bearer.ebi, Access_changed_from_Non_3GPP_to_3GPP));
+ as_GTP2C_DeleteBearer_success();
+}
+
/* GSUP AuthInfo Req + Resp, triggers SWx MAR + MAA. */
private function f_GSUP_AI_success() runs on EPDG_ConnHdlr {
var GSUP_PDU rx_gsup;
@@ -495,8 +527,25 @@
setverdict(pass);
}
+private function f_TC_ho_wifi_to_lte(charstring id) runs on EPDG_ConnHdlr {
+ f_TC_authinfo_normal(id);
+ /* Whenever UE goes back to 3GPP, PGW will notify ePDG with a Delete Bearer Request
+ * cause="Access changed from non-3gpp to 3gpp" */
+ f_GTP2C_DeleteBearer_success();
+}
+
+testcase TC_ho_wifi_to_lte() runs on MTC_CT {
+ var EPDG_ConnHdlrPars pars := f_init_pars();
+ var EPDG_ConnHdlr vc_conn;
+ f_init();
+ vc_conn := f_start_handler(refers(f_TC_ho_wifi_to_lte), pars);
+ vc_conn.done;
+ setverdict(pass);
+}
+
control {
execute ( TC_authinfo_normal() );
+ execute ( TC_ho_wifi_to_lte() );
}
}
diff --git a/library/GTPv2_Templates.ttcn b/library/GTPv2_Templates.ttcn
index e1e71f0..6ea06a2 100644
--- a/library/GTPv2_Templates.ttcn
+++ b/library/GTPv2_Templates.ttcn
@@ -506,11 +506,11 @@
/* 8.28 */
template (value) BearerContextIEs
-ts_GTP2C_BcContextIE(template (value) uint4_t bid,
+ts_GTP2C_BcContextIE(template (value) uint4_t ebi,
template (omit) FullyQualifiedTEID_List teid_list := omit,
template (omit) Bearer_QoS qos := ts_GTP2C_BearerQos('09'O, 0,0,0,0),
template (omit) ChargingID charging_id := omit) := {
- ePS_Bearer_ID := ts_GTP2C_EpsBearerId(bid),
+ ePS_Bearer_ID := ts_GTP2C_EpsBearerId(ebi),
cause := ts_GTP2C_Cause(Request_accepted, '0'B),
ePS_Bearer_TFT := omit,
fullyQualifiedTEID := teid_list,