lynxis lazus has uploaded this change for review.

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SGSN: add TC_attach_gmm_attach_req_while_gmm_attach_retransmit

Extend the TC_attach_gmm_attach_req_while_gmm_attach
by "loosing" an ID Req message.

Change-Id: I8d208c0a98675238dba439ab3e75758293928588
---
M sgsn/SGSN_Tests.ttcn
1 file changed, 89 insertions(+), 4 deletions(-)

git pull ssh://gerrit.osmocom.org:29418/osmo-ttcn3-hacks refs/changes/55/39255/1

diff --git a/sgsn/SGSN_Tests.ttcn b/sgsn/SGSN_Tests.ttcn
index f8b9213..71b55c7 100644
--- a/sgsn/SGSN_Tests.ttcn
+++ b/sgsn/SGSN_Tests.ttcn
@@ -2073,10 +2073,11 @@
 	 * MS <- SGSN: Identity Request IMSI
 	 * MS -> SGSN: Identity Response IMSI
 	 * MS -> SGSN: Attach Request (2nd)
-	 * SGS -> HLR: SAI Request
-	 * SGS <- HLR: SAI Response
-	 * MS <- SGSN: Identity Request IMEI
-	 * MS -> SGSN: Identity Response IMEI
+	 * SGSN -> HLR: SAI Request
+	 * SGSN <- HLR: SAI Response
+	 * MS <- SGSN: Auth Req
+	 * MS <- SGSN: Auth Resp
+	 * SGSN <-> HLR: ULA/ISD
 	 * MS <- SGSN: Attach Accept
 	 * MS -> SGSN: Attach Complete
 	 */
@@ -2088,6 +2089,89 @@
 	f_cleanup();
 }
 
+/* The main difference to f_TC_attach_gmm_attach_req_while_gmm_attach is the *lost* of the first ID Req */
+private function f_TC_attach_gmm_attach_req_while_gmm_attach_retransmit(charstring id) runs on BSSGP_ConnHdlr {
+	var integer count_req := 0;
+	var MobileL3_CommonIE_Types.MobileIdentityLV mi;
+	var RoutingAreaIdentificationV rand_rai := f_random_RAI();
+	var PDU_L3_SGSN_MS l3_mt;
+
+	g_pars.vec := f_gen_auth_vec_3g();
+	g_pars.p_tmsi := f_random_ptmsi(suffix := '01'O);
+
+	f_send_l3(ts_GMM_ATTACH_REQ(f_mi_get_lv(), rand_rai, true, false, omit, omit));
+
+	alt {
+		[] BSSGP[0].receive(tr_GMM_ATTACH_REJECT(?)) {
+			setverdict(fail, "Unexpected GMM ATTACH REJECT");
+			mtc.stop;
+		}
+		[] BSSGP[0].receive(tr_GMM_ID_REQ('001'B)) {
+			mi := valueof(ts_MI_IMSI_LV(g_pars.imsi));
+			f_send_l3(ts_GMM_ATTACH_REQ(f_mi_get_lv(), rand_rai, true, false, omit, omit));
+		}
+	}
+
+	alt {
+		[] BSSGP[0].receive(tr_GMM_ATTACH_REJECT(?)) {
+			setverdict(fail, "Unexpected GMM ATTACH REJECT");
+			mtc.stop;
+		}
+		[] BSSGP[0].receive(tr_GMM_ID_REQ('001'B)) {
+			mi := valueof(ts_MI_IMSI_LV(g_pars.imsi));
+			f_send_l3(ts_GMM_ID_RESP(mi));
+			repeat;
+		}
+		[] BSSGP[0].receive(tr_GMM_ID_REQ('010'B)) {
+			/* send out a second GMM_Attach Request.
+			 * If the SGSN follows the rules, this 2nd ATTACH REQ should be ignored, because
+			 * of the same content */
+			mi := valueof(ts_MI_IMEI_LV(g_pars.imei));
+			repeat;
+		}
+		[] as_gmm_auth(umts_aka_challenge := true, expect_sai := true) {};
+	}
+	f_sleep(1.0);
+
+	/* we've sent already a IMEI answer, we should NOT asked again for IMEI */
+	alt {
+		[] as_gmm_gsup_lu_isd() { repeat; };
+		[] BSSGP[0].receive(tr_GMM_ATTACH_REJECT(?)) {
+			setverdict(fail, "Unexpected GMM ATTACH REJECT");
+			mtc.stop;
+		}
+		[] BSSGP[0].receive(tr_GMM_ATTACH_ACCEPT('001'B, ?, ?)) -> value l3_mt {
+			f_process_attach_accept(l3_mt.msgs.gprs_mm.attachAccept);
+			f_send_l3(ts_GMM_ATTACH_COMPL);
+			setverdict(pass);
+			/* FIXME: Extract P-TMSI, if any. Only send Complete if necessary */
+		}
+	}
+}
+
+testcase TC_attach_gmm_attach_req_while_gmm_attach_retransmit() runs on test_CT {
+	/* Testing if the SGSN ignore Attach Request with the exact same content */
+	/* MS -> SGSN: Attach Request TMSI
+	 * MS <- SGSN: Identity Request IMSI
+	 * MS -> SGSN: Attach Request (2nd)
+	 * MS <- SGSN: Identity Request IMSI (retrans)
+	 * SGSN -> HLR: SAI Request
+	 * SGSN <- HLR: SAI Response
+	 * MS <- SGSN: Auth Req
+	 * MS <- SGSN: Auth Resp
+	 * SGSN <-> HLR: ULA/ISD
+	 * MS <- SGSN: Attach Accept
+	 * MS -> SGSN: Attach Complete
+	 */
+	var BSSGP_ConnHdlr vc_conn;
+	f_init();
+	f_sleep(1.0);
+	vc_conn := f_start_handler(refers(f_TC_attach_gmm_attach_req_while_gmm_attach_retransmit), testcasename(), g_gb, 39);
+	vc_conn.done;
+	f_cleanup();
+}
+
+
 private function f_TC_attach_usim_resync(charstring id) runs on BSSGP_ConnHdlr {
 	var RoutingAreaIdentificationV old_ra := f_random_RAI();
 
@@ -3375,6 +3459,7 @@
 	execute( TC_attach_pdp_act_user_error_ind_ggsn() );
 	execute( TC_attach_pdp_act_gmm_detach() );
 	execute( TC_attach_gmm_attach_req_while_gmm_attach() );
+	execute( TC_attach_gmm_attach_req_while_gmm_attach_retransmit() );
 
 	execute( TC_xid_empty_l3() );
 	execute( TC_xid_n201u() );

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