[M] Change in osmo-ttcn3-hacks[master]: mgw: add f_TC_amr_switch_to_iuup

27 Sep 2023

neels has uploaded this change for review. ( https://gerrit.osmocom.org/c/osmo-ttcn3-hacks/+/34539?usp=email )
Change subject: mgw: add f_TC_amr_switch_to_iuup
......................................................................
mgw: add f_TC_amr_switch_to_iuup
Change-Id: I08eca9ea123029c37892d5de7c94a8ed6cc0a913
---
M mgw/MGCP_Test.ttcn
1 file changed, 160 insertions(+), 0 deletions(-)
git pull ssh://gerrit.osmocom.org:29418/osmo-ttcn3-hacks refs/changes/39/34539/1

diff --git a/mgw/MGCP_Test.ttcn b/mgw/MGCP_Test.ttcn
index 73591b2..ca6e520 100644
--- a/mgw/MGCP_Test.ttcn
+++ b/mgw/MGCP_Test.ttcn
@@ -3078,6 +3078,155 @@
    				   mp_local_ipv4, mp_remote_ipv4);
    }
+	function f_tc_amr_switch_to_iuup(charstring local_ip_a, charstring remote_ip_a,
+					 IuUP_RabFlowCombinationList rfcl_a,
+					 charstring local_ip_b, charstring remote_ip_b) runs on dummy_CT {
+		var RtpFlowData flow[2];
+		var RtpemStats stats[2];
+		var MgcpResponse resp;
+		var MgcpEndpoint ep := c_mgw_ep_rtpbridge & "2@" & c_mgw_domain;
+		var MgcpCallId call_id := '1227'H;
+		var integer num_pkts_tx[2];
+		var integer temp;
+
+		f_init(ep);
+
+		/* Create the first connection in receive only mode (RNC side, IuUP-Init active) */
+		flow[0] := valueof(t_RtpFlow(local_ip_a, remote_ip_a, 96, "VND.3GPP.IUFP/16000"));
+		flow[0].em.portnr := 10000;
+		flow[0].rtp_cfg := c_RtpemDefaultCfg;
+		flow[0].rtp_cfg.tx_payloads[0].payload_type := flow[0].codec_descr[0].pt;
+		flow[0].rtp_cfg.rx_payloads[0].payload_type := flow[0].codec_descr[0].pt;
+		flow[0].rtp_cfg.tx_payloads[0].fixed_payload := '4f28959ffeb80181f5c4e83d176c897b4a4e333298333419a493ca63ded6e0'O;
+		/* flow[1].rtp_cfg.rx_payloads[0].fixed_payload converted AMR-BE-RTP->AMR-IUUP*/
+		flow[0].rtp_cfg.rx_payloads[0].fixed_payload := '08556d944c71a1a081e7ead204244480000ecd82b81118000097c4794e7740'O;
+		flow[0].rtp_cfg.iuup_mode := true;
+		flow[0].rtp_cfg.iuup_cfg.active_init := true;
+		flow[0].rtp_cfg.iuup_cfg.rab_flow_combs := rfcl_a;
+		f_flow_create(RTPEM[0], ep, call_id, "recvonly", flow[0], true);
+		f_rtpem_mode(RTPEM[0], RTPEM_MODE_RXONLY);
+
+		/* Create the second connection. This connection will be also
+		 * in receive only mode (CN side, regular RTP) */
+		flow[1] := valueof(t_RtpFlow(local_ip_b, remote_ip_b, 112, "AMR/8000"));
+		flow[1].em.portnr := 20000;
+		flow[1].rtp_cfg := c_RtpemDefaultCfg;
+		flow[1].rtp_cfg.tx_payloads[0].payload_type := flow[1].codec_descr[0].pt;
+		flow[1].rtp_cfg.rx_payloads[0].payload_type := flow[1].codec_descr[0].pt;
+		flow[1].rtp_cfg.tx_payloads[0].fixed_payload := '0382155b65131c68682079fab4810911200003b360ae0446000025f11e539dd0'O;
+		/* flow[0].rtp_cfg.rx_payloads[0].fixed_payload converted AMR-IuUP->AMR-BE-RTP*/
+		flow[1].rtp_cfg.rx_payloads[0].fixed_payload := 'f3d3ca2567ffae00607d713a0f45db225ed2938ccca60ccd066924f298f7b5b8'O;
+		flow[1].rtp_cfg.iuup_mode := false;
+		f_flow_create(RTPEM[1], ep, call_id, "recvonly", flow[1], true);
+		f_rtpem_mode(RTPEM[1], RTPEM_MODE_RXONLY);
+
+		/* The first leg starts transmitting */
+		f_rtpem_mode(RTPEM[0], RTPEM_MODE_TXONLY);
+		f_sleep(0.5);
+		stats[0] := f_rtpem_stats_get(RTPEM[0]);
+		if (stats[0].num_pkts_rx_err_disabled != 0) {
+			setverdict(fail, "received packets from MGW on recvonly connection 0");
+			mtc.stop;
+		}
+		stats[1] := f_rtpem_stats_get(RTPEM[1]);
+		if (stats[1].num_pkts_rx_err_disabled != 0) {
+			setverdict(fail, "received packets from MGW on recvonly connection 1");
+			mtc.stop;
+		}
+
+		/* The second leg starts transmitting a little later */
+		f_rtpem_mode(RTPEM[1], RTPEM_MODE_TXONLY);
+		f_sleep(1.0);
+		stats[0] := f_rtpem_stats_get(RTPEM[0]);
+		if (stats[0].num_pkts_rx_err_disabled != 0) {
+			setverdict(fail, "received packets from MGW on recvonly connection 0");
+			mtc.stop;
+		}
+		stats[1] := f_rtpem_stats_get(RTPEM[1]);
+		if (stats[1].num_pkts_rx_err_disabled != 0) {
+			setverdict(fail, "received packets from MGW on recvonly connection 1");
+			mtc.stop;
+		}
+
+		/* The first leg will now be switched into bidirectional
+		 * mode, but we do not expect any data coming back yet. */
+		f_rtpem_mode(RTPEM[0], RTPEM_MODE_BIDIR);
+		stats[1] := f_rtpem_stats_get(RTPEM[1]);
+		num_pkts_tx[1] := stats[1].num_pkts_tx;
+		f_flow_modify(RTPEM[0], ep, call_id, "sendrecv", flow[0]);
+		f_sleep(0.5);
+		stats[0] := f_rtpem_stats_get(RTPEM[0]);
+		if (stats[0].num_pkts_rx_err_disabled != 0) {
+			setverdict(fail, "received packets from MGW on recvonly connection 0");
+			mtc.stop;
+		}
+		stats[1] := f_rtpem_stats_get(RTPEM[1]);
+		if (stats[1].num_pkts_rx_err_disabled != 0) {
+			setverdict(fail, "received packets from MGW on recvonly connection 1");
+			mtc.stop;
+		}
+
+		/* When the second leg is switched into bidirectional mode
+		 * as well, then the MGW will connect the two together and
+		 * we should see RTP streams passing through from both ends. */
+		f_rtpem_mode(RTPEM[1], RTPEM_MODE_BIDIR);
+		stats[0] := f_rtpem_stats_get(RTPEM[0]);
+		num_pkts_tx[0] := stats[0].num_pkts_tx;
+		f_flow_modify(RTPEM[1], ep, call_id, "sendrecv", flow[1]);
+		f_sleep(2.0);
+
+		stats[0] := f_rtpem_stats_get(RTPEM[0]);
+		stats[1] := f_rtpem_stats_get(RTPEM[1]);
+
+		temp := stats[0].num_pkts_tx - num_pkts_tx[0] - stats[1].num_pkts_rx;
+		if (temp > 3 or temp < -3) {
+			setverdict(fail, "number of packets not within normal parameters:", temp);
+			mtc.stop;
+		}
+
+		temp := stats[1].num_pkts_tx - num_pkts_tx[1] - stats[0].num_pkts_rx;
+		if (temp > 3 or temp < -3) {
+			setverdict(fail, "number of packets not within normal parameters:", temp);
+			mtc.stop;
+		}
+
+		f_rtpem_stats_err_check(stats[0]);
+		f_rtpem_stats_err_check(stats[1]);
+
+		/* Modify the AMR side to also do IuUP */
+		flow[1].codec_descr := {{
+			pt := 96,
+			codec := "VND.3GPP.IUFP/16000",
+			fmtp := omit
+		}};
+		flow[1].rtp_cfg.iuup_mode := true; /* <-- does it work to switch this on with f_flow_modify()? */
+		flow[1].rtp_cfg.iuup_cfg.active_init := false;
+		flow[1].rtp_cfg.iuup_cfg.rab_flow_combs := rfcl_a;
+		flow[1].rtp_cfg.tx_payloads[0].payload_type := flow[1].codec_descr[0].pt;
+		flow[1].rtp_cfg.rx_payloads[0].payload_type := flow[1].codec_descr[0].pt;
+		f_flow_modify(RTPEM[1], ep, call_id, "sendrecv", flow[1]);
+
+		// ... now what
+		// want to verify that the RTP packets switched from AMR to IuUP,
+		// and that an IuUP Initialization happened by initiative of osmo-mgw.
+		// In the pcap, I see a switch to IuUP without Initialization, and then invalid IuUP PDUs being
+		// forwarded out of flow[1] (wireshark: "Unknown PDU Type(15)").
+		f_sleep(3.0);
+
+		/* Tear down */
+		f_flow_delete(RTPEM[0]);
+		f_flow_delete(RTPEM[1], ep, call_id);
+		setverdict(pass);
+	}
+	testcase TC_amr_switch_to_iuup() runs on dummy_CT {
+		var template (value) IuUP_RabFlowCombinationList rfcl := {
+			t_IuUP_RFC_AMR_12_2(0),
+			t_IuUP_RFC_AMR_SID(1),
+			t_IuUP_RFC_AMR_NO_DATA(2)
+		};
+		f_tc_amr_switch_to_iuup(mp_local_ipv4, mp_remote_ipv4, valueof(rfcl),
+					mp_local_ipv4, mp_remote_ipv4);
+	}
    control {
    	execute(TC_selftest());
    	execute(TC_auep_null());
@@ -3167,6 +3316,8 @@
    	execute(TC_two_crcx_mdcx_and_iuup_rtp());
    	execute(TC_two_crcx_mdcx_and_iuup_rtp_rfci_unordered());
+		execute(TC_amr_switch_to_iuup());
+
    	execute(TC_two_crcx_mdcx_and_rtp_clearmode());
/* Note: This testcase will trigger an OSMO_ASSERT() bug in
-- 
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Gerrit-Project: osmo-ttcn3-hacks
Gerrit-Branch: master
Gerrit-Change-Id: I08eca9ea123029c37892d5de7c94a8ed6cc0a913
Gerrit-Change-Number: 34539
Gerrit-PatchSet: 1
Gerrit-Owner: neels nhofmeyr@sysmocom.de
Gerrit-MessageType: newchange



    

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[M] Change in osmo-ttcn3-hacks[master]: mgw: add f_TC_amr_switch_to_iuup