summaryrefslogtreecommitdiffstats
diff options
context:
space:
mode:
authorHarald Welte <laforge@osmocom.org>2021-04-01 19:12:41 +0200
committerHarald Welte <laforge@osmocom.org>2021-04-01 21:27:33 +0200
commita4abe20d62ba116cb615315de4793045f4dc8080 (patch)
tree0e0bf942e8061a02a641d62f3974c6af1b6d8013
parent424ec5211c90aa5472c1249a2bef6b6191447f0b (diff)
NS_Emulation: Implement minimal PCU-side SNS functionality
Using this code, we can run a TTCN3 test using NS_Emulation in IP-SNS mode. It only covers the most basic cases but works for simple scenarios. Change-Id: Id1fb0fcb7a497a9614e82beb8a2c64b5af88150d
-rw-r--r--library/NS_Emulation.ttcnpp79
1 files changed, 79 insertions, 0 deletions
diff --git a/library/NS_Emulation.ttcnpp b/library/NS_Emulation.ttcnpp
index d58dc45d..b5fc807c 100644
--- a/library/NS_Emulation.ttcnpp
+++ b/library/NS_Emulation.ttcnpp
@@ -413,6 +413,9 @@ module NS_Emulation {
f_nsvc_add(nsvc_cfg);
}
+ if (g_config.handle_sns and not g_config.role_sgsn) {
+ f_sns_outbound_size_config();
+ }
while (true) {
alt {
[] as_ns_common() {}
@@ -473,6 +476,7 @@ module NS_Emulation {
}
[g_config.handle_sns and g_config.role_sgsn] as_vcg_sns_sgsn();
+ [g_config.handle_sns and not g_config.role_sgsn] as_vcg_sns_pcu();
[] NSVC.receive(tr_NsUdInd(?, ?, ?)) -> value rx_nsudi {
Misc_Helpers.f_shutdown(__BFILE__, __LINE__, fail,
@@ -545,6 +549,81 @@ module NS_Emulation {
}
}
+ /* perform an outbound SNS-SIZE + SNS-CONFIG */
+ private function f_sns_outbound_size_config(integer idx := 0) runs on NS_CT {
+ var NSVCConfiguration nsvc_cfg := g_config.nsvc[idx];
+ var NSVC_CT vc;
+
+ if (nsvc_cfg.provider.ip.address_family == AF_INET) {
+ NSVC.send(SnsRequest:{nsvc_cfg.nsvci, ts_SNS_SIZE(g_config.nsei, rst_flag := true,
+ max_nsvcs := 1,
+ num_v4 := 1, num_v6 := omit)});
+ } else {
+ NSVC.send(SnsRequest:{nsvc_cfg.nsvci, ts_SNS_SIZE(g_config.nsei, rst_flag := true,
+ max_nsvcs := 1,
+ num_v4 := omit, num_v6 := 1)});
+ }
+ /* expect SIZE-ACK */
+ alt {
+ [] NSVC.receive(SnsIndication:{?, tr_SNS_SIZE_ACK(g_config.nsei, omit)}) -> sender vc;
+ [] NSVC.receive(NsStatusIndication:?) { repeat; }
+ }
+ /* send a SNS-CONFIG in response and expect a SNS-CONFIG-ACK */
+ var template (omit) IP4_Elements v4;
+ var template (omit) IP6_Elements v6;
+ gen_sns_ip_elems(v4, v6);
+ NSVC.send(SnsRequest:{nsvc_cfg.nsvci,
+ ts_SNS_CONFIG(g_config.nsei, true, v4, v6)}) to vc;
+ alt {
+ [] as_ns_common_status() {
+ repeat;
+ }
+ [] NSVC.receive(SnsIndication:{?,
+ tr_SNS_CONFIG_ACK(g_config.nsei, omit)}) from vc {
+ /* success */
+ log("Outbound SNS Config succeeded.");
+ }
+ [] NSVC.receive(SnsIndication:{?,
+ tr_SNS_CONFIG_ACK(g_config.nsei, ?)}) from vc {
+ setverdict(fail, "Unexpected SNS-CONFIG-NACK");
+ self.stop;
+ }
+ }
+ }
+
+ /* simple IP Sub-Network Service responder for the PCU/BSS side. This is not a full implementation
+ * of the protocol, merely sufficient to make the SGSN side happy to proceed */
+ private altstep as_vcg_sns_pcu() runs on NS_CT {
+ var SnsIndication sind;
+ var NSVC_CT vc;
+
+ /* FIXME: We assume our peer has only one endpoint */
+ [] NSVC.receive(SnsIndication:{?, tr_SNS_CONFIG(g_config.nsei, true,
+ {tr_SNS_IPv4(g_config.nsvc[0].provider.ip.remote_ip,
+ g_config.nsvc[0].provider.ip.remote_udp_port)})})
+ -> value sind sender vc {
+ /* blindly acknowledge whatever the SGSN sends */
+ NSVC.send(SnsRequest:{sind.nsvci, ts_SNS_CONFIG_ACK(g_config.nsei, omit)}) to vc;
+ log("Inbound SNS Config succeeded.");
+ /* switch to "alive" state already before sending the SNS-CONFIG, as otherwise
+ * there would be a race condition between internally performing the state change
+ * of all related NS-VCs and the first incoming NS-PDU after SNS-CONFIG-ACK */
+ f_broadcast_ns_ctrl(NsCtrlRequest:ForceAliveState);
+ /* inform all NS-VC that they are now considered alive */
+ f_broadcast_ns_ctrl(NsCtrlRequest:StartAliveProcedure);
+ }
+ [] NSVC.receive(SnsIndication:{?, tr_SNS_CONFIG(g_config.nsei, false, ?)}) { /* ignore */}
+ [] NSVC.receive(SnsIndication:{?, tr_SNS_CONFIG(g_config.nsei, true, ?)}) {
+ setverdict(fail, "Unexpected SNS-CONFIG content");
+ self.stop;
+ }
+ [] NSVC.receive(SnsIndication:{?, tr_SNS_CONFIG(?, ?, ?)}) {
+ setverdict(fail, "SNS-CONFIG from unexpected NSEI");
+ self.stop;
+ }
+
+ }
+
/* simple IP Sub-Network Service responder for the SGSN side. This is not a full implementation
* of the protocol, merely sufficient to make the PCU/BSS side happy to proceed */
private altstep as_vcg_sns_sgsn() runs on NS_CT {