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authorPau Espin Pedrol <pespin@sysmocom.de>2019-06-10 18:09:16 +0200
committerpespin <pespin@sysmocom.de>2019-06-13 14:33:23 +0000
commitd1d4953d3166535a42d9f901deb15b1fbcda897d (patch)
tree814c1b8e27909a20133e11b9cd2a3cf22789c8c6
parent8d85ba4baad12e558b16d2e879847b3297f56ccc (diff)
bscnat: Refactor MSC side code to allow different actions per test
Each test can now plug in different acctions to be done by the emulated MSC, by passing a BssmapCreateCallback RAN_Emaulation callback to f_init(). Old hardcoded behaviour (main()) is renamed and used in laready existing tests. New infrastructure provides a generic BssmapCreateCallback taking care of required boilerplate, so new tests/users only need to define a new callback calling that generic one with a function pointer where all test logic is implemented. Change-Id: Ic429420d0d95b6aacb6e5c44031b49c942ed544d
-rw-r--r--bsc-nat/BSCNAT_Tests.ttcn12
-rw-r--r--bsc-nat/MSC_ConnectionHandler.ttcn73
-rwxr-xr-xbsc-nat/MSC_Simulation.ttcn8
3 files changed, 71 insertions, 22 deletions
diff --git a/bsc-nat/BSCNAT_Tests.ttcn b/bsc-nat/BSCNAT_Tests.ttcn
index fda065a..47d894b 100644
--- a/bsc-nat/BSCNAT_Tests.ttcn
+++ b/bsc-nat/BSCNAT_Tests.ttcn
@@ -16,6 +16,7 @@ import from Osmocom_Types all;
import from IPL4asp_Types all;
import from IPA_Emulation all;
+import from RAN_Emulation all;
import from MTP3asp_Types all;
@@ -24,6 +25,7 @@ import from SCCPasp_Types all;
import from SCCP_Emulation all;
import from MSC_Simulation all;
+import from MSC_ConnectionHandler all;
import from BSC_MS_Simulation all;
import from BSC_MS_ConnectionHandler all;
@@ -136,7 +138,7 @@ function f_init_vty(charstring id := "foo") runs on test_CT {
f_vty_transceive(BSCNATVTY, "enable");
}
-function f_init(void_fn_bsc_ms fn_bsc_ms, boolean use_osmux) runs on test_CT {
+function f_init(void_fn_bsc_ms fn_bsc_ms, BssmapCreateCallback cb_msc, boolean use_osmux) runs on test_CT {
var integer i;
var charstring id;
@@ -147,7 +149,9 @@ function f_init(void_fn_bsc_ms fn_bsc_ms, boolean use_osmux) runs on test_CT {
f_init_MscState(msc[i], mp_msc_pc +i, mp_bsc_pc, mp_msc_ssn, mp_bsc_ssn);
id := "MSC" & int2str(i);
msc[i].MSC := MSC_CT.create(id);
- msc[i].MSC.start(MSC_Simulation.main(mp_msc_ip, mp_msc_port + i, msc[i].sccp_pars, msc[i].sccp_addr_own, id));
+ msc[i].MSC.start(MSC_Simulation.main(mp_msc_ip, mp_msc_port + i,
+ msc[i].sccp_pars, msc[i].sccp_addr_own,
+ cb_msc, id));
}
/* Wait for bsc_nat to attach to MSC. Before that all BSC connections will be dropped */
@@ -186,7 +190,9 @@ function f_wait_finish(timer T) runs on test_CT {
function f_TC_recv_dump(boolean use_osmux := false) runs on test_CT {
timer T := 30.0;
- f_init(refers(bsc_ms_establish_fully), use_osmux);
+ f_init(refers(bsc_ms_establish_fully),
+ refers(CreateCallback_establish_fully),
+ use_osmux);
f_wait_finish(T);
}
diff --git a/bsc-nat/MSC_ConnectionHandler.ttcn b/bsc-nat/MSC_ConnectionHandler.ttcn
index c8cb005..e4d3816 100644
--- a/bsc-nat/MSC_ConnectionHandler.ttcn
+++ b/bsc-nat/MSC_ConnectionHandler.ttcn
@@ -21,6 +21,8 @@ import from MGCP_Types all;
import from MGCP_Templates all;
import from SDP_Types all;
+type function void_fn_msc(charstring id) runs on MSC_ConnHdlr;
+
/* this component represents a single subscriber connection at the MSC.
* There is a 1:1 mapping between SCCP connections and RAN_ConnHdlr components.
* We inherit all component variables, ports, functions, ... from RAN_ConnHdlr */
@@ -32,24 +34,38 @@ type component MSC_ConnHdlr extends RAN_ConnHdlr {
var MgcpEndpoint g_ep_name;
var MgcpCallId g_call_id;
var MgcpConnectionId g_mgcp_conn_id;
+ var MSC_TestHdlrParams g_pars;
}
-/* Callback function from general BSSMAP_Emulation whenever a new incoming
- * SCCP connection arrivces. Must create + start a new component */
-private function CreateCallback(BSSAP_N_CONNECT_ind conn_ind, charstring id)
-runs on RAN_Emulation_CT return RAN_ConnHdlr {
- var MSC_ConnHdlr vc_conn;
- /* Create a new RAN_ConnHdlr component */
- vc_conn := MSC_ConnHdlr.create(g_ran_id & "-Conn-" & int2str(conn_ind.connectionId));
- /* connect it to the port */
+type record MSC_TestHdlrParams {
+ integer connection_id,
+ integer e1_timeslot
+};
+
+/* helper function to create and connect a MSC_ConnHdlr component */
+private function f_connect_handler(inout MSC_ConnHdlr vc_conn) runs on RAN_Emulation_CT {
+ /* connect client BSSAP port to BSSAP dispatcher */
connect(vc_conn:BSSAP, self:CLIENT);
- /* start it */
- vc_conn.start(MSC_ConnectionHandler.main(conn_ind.connectionId, g_next_e1_ts));
- /* increment next E1 timeslot */
- g_next_e1_ts := g_next_e1_ts + 1;
+}
+
+private function f_msc_start_handler(void_fn_msc fn, charstring id, template (omit) MSC_TestHdlrParams pars := omit)
+runs on RAN_Emulation_CT return MSC_ConnHdlr {
+ var MSC_ConnHdlr vc_conn;
+ vc_conn := MSC_ConnHdlr.create(id);
+ f_connect_handler(vc_conn);
+ vc_conn.start(f_handler_init(fn, id, pars));
return vc_conn;
}
+/* first function inside ConnHdlr component; sets g_pars + starts function */
+private function f_handler_init(void_fn_msc fn, charstring id, template (omit) MSC_TestHdlrParams pars := omit)
+runs on MSC_ConnHdlr {
+ if (isvalue(pars)) {
+ g_pars := valueof(pars);
+ }
+ fn.apply(id);
+}
+
/* Callback function from general BSSMAP_Emulation whenever a connectionless
* BSSMAP message arrives. Can retunr a PDU_BSSAP that should be sent in return */
private function UnitdataCallback(PDU_BSSAP bssap)
@@ -63,8 +79,25 @@ runs on RAN_Emulation_CT return template PDU_BSSAP {
return resp;
}
+/* Callback function from general BSSMAP_Emulation whenever a new incoming
+ * SCCP connection arrivces. Must create + start a new component */
+private function CreateCallback_generic(void_fn_msc fn, BSSAP_N_CONNECT_ind conn_ind, charstring id)
+runs on RAN_Emulation_CT return RAN_ConnHdlr {
+ var MSC_ConnHdlr vc_conn;
+ var MSC_TestHdlrParams pars;
+ pars.connection_id := conn_ind.connectionId;
+ pars.e1_timeslot := g_next_e1_ts;
+
+ /* Create a new RAN_ConnHdlr component */
+ vc_conn := f_msc_start_handler(fn, g_ran_id & "-Conn-" & int2str(conn_ind.connectionId), pars);
+
+ /* increment next E1 timeslot */
+ g_next_e1_ts := g_next_e1_ts + 1;
+ return vc_conn;
+}
+
const RanOps MSC_RanOps := {
- create_cb := refers(CreateCallback),
+ create_cb := omit,
unitdata_cb := refers(UnitdataCallback),
decode_dtap := false,
role_ms := false,
@@ -84,14 +117,20 @@ type enumerated MSC_State {
MSC_STATE_WAIT_DLCX_ACK
}
+/* Callback function from general BSSMAP_Emulation whenever a new incoming
+ * SCCP connection arrivces. Must create + start a new component */
+function CreateCallback_establish_fully(BSSAP_N_CONNECT_ind conn_ind, charstring id)
+runs on RAN_Emulation_CT return RAN_ConnHdlr {
+ return CreateCallback_generic(refers(f_msc_establish_fully), conn_ind, id);
+}
/* main function processing various incoming events */
-function main(integer connection_id, integer e1_timeslot) runs on MSC_ConnHdlr {
+function f_msc_establish_fully(charstring id) runs on MSC_ConnHdlr {
var MgcpResponse mgcp_rsp;
timer T := 5.0;
- g_sccp_conn_id := connection_id;
+ g_sccp_conn_id := g_pars.connection_id;
g_call_id := f_mgcp_alloc_call_id();
- g_ep_name := hex2str(int2hex(e1_timeslot, 1)) & "@mgw";
+ g_ep_name := hex2str(int2hex(g_pars.e1_timeslot, 1)) & "@mgw";
/* we just accepted an incoming SCCP connection, start guard timer */
T.start;
@@ -103,7 +142,7 @@ function main(integer connection_id, integer e1_timeslot) runs on MSC_ConnHdlr {
[g_state == MSC_STATE_NONE] BSSAP.receive(tr_BSSMAP_ComplL3) -> value bssap {
/* respond with ASSIGNMENT CMD */
g_state := MSC_STATE_WAIT_ASS_COMPL;
- BSSAP.send(ts_BSSMAP_AssignmentReq(ts_BSSMAP_IE_CIC(0, e1_timeslot)));
+ BSSAP.send(ts_BSSMAP_AssignmentReq(ts_BSSMAP_IE_CIC(0, g_pars.e1_timeslot)));
}
[g_state == MSC_STATE_WAIT_ASS_COMPL] BSSAP.receive(tr_BSSMAP_AssignmentComplete(?,*)) {
/* FIXME: Send MGCP CRCX */
diff --git a/bsc-nat/MSC_Simulation.ttcn b/bsc-nat/MSC_Simulation.ttcn
index bc47f89..14229cc 100755
--- a/bsc-nat/MSC_Simulation.ttcn
+++ b/bsc-nat/MSC_Simulation.ttcn
@@ -38,7 +38,8 @@ modulepar {
function main(charstring local_ip, PortNumber local_port,
MSC_SCCP_MTP3_parameters sccp_pars,
- SCCP_PAR_Address sccp_addr_own, charstring id) runs on MSC_CT
+ SCCP_PAR_Address sccp_addr_own,
+ BssmapCreateCallback cb, charstring id) runs on MSC_CT
{
/* create components */
vc_IPA := IPA_Emulation_CT.create(id & "-IPA");
@@ -64,7 +65,10 @@ function main(charstring local_ip, PortNumber local_port,
vc_IPA.start(IPA_Emulation.main_server(local_ip, local_port));
vc_SCCP.start(SCCPStart(sccp_pars));
- vc_BSSMAP.start(RAN_Emulation.main(MSC_ConnectionHandler.MSC_RanOps, id & "-BSSMAP"));
+
+ var RanOps ranops := MSC_ConnectionHandler.MSC_RanOps;
+ ranops.create_cb := cb;
+ vc_BSSMAP.start(RAN_Emulation.main(ranops, id & "-BSSMAP"));
/* wait until termination of respective components */
vc_IPA.done;