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osmo-ttcn3-hacks
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osmo-ttcn3-hacks/bsc/MSC_ConnectionHandler.ttcn

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module MSC_ConnectionHandler {
import from General_Types all;
import from Osmocom_Types all;
import from GSM_Types all;
import from SCCPasp_Types all;
import from BSSAP_Types all;
import from BSSMAP_Emulation all;
import from BSSMAP_Templates all;
import from IPL4asp_Types all;
import from Native_Functions all;
import from MGCP_Types all;
import from MGCP_Templates all;
import from MGCP_Emulation all;
import from SDP_Types all;
import from RSL_Emulation all;
import from RSL_Types all;
import from MobileL3_Types all;
import from MobileL3_CommonIE_Types all;
import from MobileL3_RRM_Types all;
import from L3_Templates all;
import from TELNETasp_PortType all;
import from Osmocom_VTY_Functions all;
/***********************************************************************
* Media related handling
***********************************************************************/
/* Tuple containing host/ip and port */
type record HostPort {
HostName host,
PortNumber port_nr
};
/* State encapsulating one MGCP Connection */
type record MgcpConnState {
boolean crcx_seen,
MgcpConnectionId conn_id,
charstring mime_type, /* e.g. AMR */
integer sample_rate, /* 8000 */
integer ptime, /* 20 */
uint7_t rtp_pt, /* RTP Payload Type */
HostPort mgw, /* MGW side */
HostPort peer /* CA side */
};
/* BTS media state */
type record BtsMediaState {
boolean ipa_crcx_seen,
uint16_t conn_id,
uint7_t rtp_pt,
HostPort bts,
HostPort peer
};
type record MediaState {
MgcpEndpoint mgcp_ep,
MgcpConnState mgcp_conn[2],
BtsMediaState bts,
BtsMediaState bts1 /* only during hand-over */
};
function f_MediaState_init(inout MediaState g_media, integer nr, HostName bts, HostName mgw) {
/* BTS Side */
g_media.bts := {
ipa_crcx_seen := false,
conn_id := nr,
rtp_pt := 0,
bts := {
host := bts,
port_nr := 9000 + nr*2
},
peer := -
}
g_media.bts1 := {
ipa_crcx_seen := false,
conn_id := nr,
rtp_pt := 0,
bts := {
host := bts, /* FIXME */
port_nr := 9000 + nr*2
},
peer := -
}
g_media.mgcp_ep := "rtpbridge/" & int2str(nr) & "@mgw";
for (var integer i:= 0; i < sizeof(g_media.mgcp_conn); i := i+1) {
g_media.mgcp_conn[i].mime_type := "AMR";
g_media.mgcp_conn[i].sample_rate := 8000;
g_media.mgcp_conn[i].ptime := 20;
g_media.mgcp_conn[i].rtp_pt := 98;
g_media.mgcp_conn[i].crcx_seen := false;
g_media.mgcp_conn[i].conn_id := f_mgcp_alloc_conn_id();
}
g_media.mgcp_conn[0].mgw := {
host := mgw,
port_nr := 10000 + nr*2
}
g_media.mgcp_conn[1].mgw := {
host := mgw,
port_nr := 11000 + nr*2
}
}
private function f_get_free_mgcp_conn() runs on MSC_ConnHdlr return integer {
for (var integer i:= 0; i < sizeof(g_media.mgcp_conn); i := i+1) {
if (not g_media.mgcp_conn[i].crcx_seen) {
return i;
}
}
setverdict(fail, "Only 2 Connections per EP!");
self.stop;
return -1;
}
private function f_get_mgcp_conn(MgcpConnectionId cid) runs on MSC_ConnHdlr return integer {
for (var integer i:= 0; i < sizeof(g_media.mgcp_conn); i := i+1) {
if (g_media.mgcp_conn[i].conn_id == cid and g_media.mgcp_conn[i].crcx_seen) {
return i;
}
}
setverdict(fail, "No Connection for ID ", cid);
self.stop;
return -1;
}
/* altstep for handling of IPA + MGCP media related commands. Can be activated by a given
* test case if it expects to see media related handling (i.e. voice calls */
altstep as_Media() runs on MSC_ConnHdlr {
var RSL_Message rsl;
var MgcpCommand mgcp_cmd;
var RSL_IE_Body ie;
[not g_media.bts.ipa_crcx_seen] RSL.receive(tr_RSL_IPA_CRCX(g_chan_nr)) -> value rsl {
/* Extract parameters from request + use in response */
if (f_rsl_find_ie(rsl, RSL_IE_IPAC_RTP_PAYLOAD, ie)) {
g_media.bts.rtp_pt := ie.ipa_rtp_pt;
}
if (f_rsl_find_ie(rsl, RSL_IE_IPAC_RTP_PAYLOAD2, ie)) {
g_media.bts.rtp_pt := ie.ipa_rtp_pt2;
}
RSL.send(ts_RSL_IPA_CRCX_ACK(g_chan_nr, g_media.bts.conn_id,
oct2int(f_inet_addr(g_media.bts.bts.host)),
g_media.bts.bts.port_nr,
g_media.bts.rtp_pt));
g_media.bts.ipa_crcx_seen := true;
repeat;
}
[g_media.bts.ipa_crcx_seen] RSL.receive(tr_RSL_IPA_MDCX(g_chan_nr, ?)) -> value rsl{
/* Extract conn_id, ip, port, rtp_pt2 from request + use in response */
f_rsl_find_ie(rsl, RSL_IE_IPAC_CONN_ID, ie);
if (g_media.bts.conn_id != ie.ipa_conn_id) {
setverdict(fail, "IPA MDCX for unknown ConnId", rsl);
self.stop;
}
/* mandatory */
f_rsl_find_ie(rsl, RSL_IE_IPAC_REMOTE_IP, ie);
g_media.bts.peer.host := f_inet_ntoa(int2oct(ie.ipa_remote_ip, 4));
f_rsl_find_ie(rsl, RSL_IE_IPAC_REMOTE_PORT, ie);
g_media.bts.peer.port_nr := ie.ipa_remote_port;
/* optional */
if (f_rsl_find_ie(rsl, RSL_IE_IPAC_RTP_PAYLOAD, ie)) {
g_media.bts.rtp_pt := ie.ipa_rtp_pt;
}
if (f_rsl_find_ie(rsl, RSL_IE_IPAC_RTP_PAYLOAD2, ie)) {
g_media.bts.rtp_pt := ie.ipa_rtp_pt2;
}
RSL.send(ts_RSL_IPA_MDCX_ACK(g_chan_nr, g_media.bts.conn_id,
oct2int(f_inet_addr(g_media.bts.peer.host)),
g_media.bts.peer.port_nr,
g_media.bts.rtp_pt));
//g_media.bts.ipa_mdcx_seen := true;
repeat;
}
/* on second (new) BTS during hand-over */
[not g_media.bts1.ipa_crcx_seen] RSL1.receive(tr_RSL_IPA_CRCX(g_chan_nr)) -> value rsl {
/* Extract parameters from request + use in response */
if (f_rsl_find_ie(rsl, RSL_IE_IPAC_RTP_PAYLOAD, ie)) {
g_media.bts1.rtp_pt := ie.ipa_rtp_pt;
}
if (f_rsl_find_ie(rsl, RSL_IE_IPAC_RTP_PAYLOAD2, ie)) {
g_media.bts1.rtp_pt := ie.ipa_rtp_pt2;
}
RSL1.send(ts_RSL_IPA_CRCX_ACK(g_chan_nr, g_media.bts1.conn_id,
oct2int(f_inet_addr(g_media.bts1.bts.host)),
g_media.bts1.bts.port_nr,
g_media.bts1.rtp_pt));
g_media.bts1.ipa_crcx_seen := true;
repeat;
}
/* on second (new) BTS during hand-over */
[g_media.bts1.ipa_crcx_seen] RSL1.receive(tr_RSL_IPA_MDCX(g_chan_nr, ?)) -> value rsl{
/* Extract conn_id, ip, port, rtp_pt2 from request + use in response */
f_rsl_find_ie(rsl, RSL_IE_IPAC_CONN_ID, ie);
if (g_media.bts1.conn_id != ie.ipa_conn_id) {
setverdict(fail, "IPA MDCX for unknown ConnId", rsl);
self.stop;
}
/* mandatory */
f_rsl_find_ie(rsl, RSL_IE_IPAC_REMOTE_IP, ie);
g_media.bts1.peer.host := f_inet_ntoa(int2oct(ie.ipa_remote_ip, 4));
f_rsl_find_ie(rsl, RSL_IE_IPAC_REMOTE_PORT, ie);
g_media.bts1.peer.port_nr := ie.ipa_remote_port;
/* optional */
if (f_rsl_find_ie(rsl, RSL_IE_IPAC_RTP_PAYLOAD, ie)) {
g_media.bts1.rtp_pt := ie.ipa_rtp_pt;
}
if (f_rsl_find_ie(rsl, RSL_IE_IPAC_RTP_PAYLOAD2, ie)) {
g_media.bts1.rtp_pt := ie.ipa_rtp_pt2;
}
RSL1.send(ts_RSL_IPA_MDCX_ACK(g_chan_nr, g_media.bts1.conn_id,
oct2int(f_inet_addr(g_media.bts1.peer.host)),
g_media.bts1.peer.port_nr,
g_media.bts1.rtp_pt));
//g_media.bts1.ipa_mdcx_seen := true;
repeat;
}
[] MGCP.receive(tr_CRCX) -> value mgcp_cmd {
var SDP_Message sdp;
var integer cid := f_get_free_mgcp_conn();
if (match(mgcp_cmd.line.ep, t_MGCP_EP_wildcard)) {
if (cid != 0) {
setverdict(fail, "MGCP wildcard EP only works in first CRCX");
self.stop;
}
/* we keep the endpoint name allocated during MediaState_init */
} else {
/* Call Agent allocated endpoint, trust/use it always */
g_media.mgcp_ep := mgcp_cmd.line.ep;
}
if (isvalue(mgcp_cmd.sdp)) {
sdp := mgcp_cmd.sdp;
g_media.mgcp_conn[cid].peer.host := sdp.connection.conn_addr.addr;
g_media.mgcp_conn[cid].peer.port_nr := sdp.media_list[0].media_field.ports.port_number;
}
var MgcpConnState mgcp_conn := g_media.mgcp_conn[cid];
sdp := valueof(ts_SDP(mgcp_conn.mgw.host, mgcp_conn.mgw.host, "foo", "21",
mgcp_conn.mgw.port_nr, { int2str(mgcp_conn.rtp_pt) },
{valueof(ts_SDP_rtpmap(mgcp_conn.rtp_pt,
mgcp_conn.mime_type & "/" &
int2str(mgcp_conn.sample_rate))),
valueof(ts_SDP_ptime(mgcp_conn.ptime)) } ));
var template MgcpResponse mgcp_resp;
mgcp_resp := ts_CRCX_ACK(mgcp_cmd.line.trans_id, mgcp_conn.conn_id, sdp);
f_mgcp_par_append(mgcp_resp.params, ts_MgcpParSpecEP(g_media.mgcp_ep));
MGCP.send(mgcp_resp);
g_media.mgcp_conn[cid].crcx_seen := true;
repeat;
}
[] MGCP.receive(tr_MDCX) -> value mgcp_cmd {
var SDP_Message sdp;
var integer cid := f_get_mgcp_conn(f_MgcpCmd_extract_conn_id(mgcp_cmd));
if (isvalue(mgcp_cmd.sdp)) {
sdp := mgcp_cmd.sdp;
g_media.mgcp_conn[cid].peer.host := sdp.connection.conn_addr.addr;
g_media.mgcp_conn[cid].peer.port_nr := sdp.media_list[0].media_field.ports.port_number;
} else {
setverdict(fail, "MDCX has no [recognizable] SDP");
}
var MgcpConnState mgcp_conn := g_media.mgcp_conn[cid];
sdp := valueof(ts_SDP(mgcp_conn.peer.host, mgcp_conn.peer.host, "foo", "21",
mgcp_conn.peer.port_nr, { int2str(mgcp_conn.rtp_pt) },
{valueof(ts_SDP_rtpmap(mgcp_conn.rtp_pt,
mgcp_conn.mime_type & "/" &
int2str(mgcp_conn.sample_rate))),
valueof(ts_SDP_ptime(mgcp_conn.ptime)) } ));
MGCP.send(ts_MDCX_ACK(mgcp_cmd.line.trans_id, mgcp_conn.conn_id, sdp));
//g_media.mgcp_mdcx_seen := true;
repeat;
}
}
/* this component represents a single subscriber connection at the MSC.
* There is a 1:1 mapping between SCCP connections and BSSAP_ConnHdlr components.
* We inherit all component variables, ports, functions, ... from BSSAP_ConnHdlr */
type component MSC_ConnHdlr extends BSSAP_ConnHdlr, RSL_DchanHdlr, MGCP_ConnHdlr {
/* SCCP Connecction Identifier for the underlying SCCP connection */
var integer g_sccp_conn_id;
/* procedure port back to our parent (BSSMAP_Emulation_CT) for control */
port BSSMAPEM_PROC_PT BSSMAPEM;
port TELNETasp_PT BSCVTY;
var MediaState g_media;
}
/* initialize all parameters */
function f_MscConnHdlr_init(integer i, HostName bts, HostName mgw) runs on MSC_ConnHdlr {
f_MediaState_init(g_media, i, bts, mgw);
map(self:BSCVTY, system:BSCVTY);
f_vty_set_prompts(BSCVTY);
f_vty_transceive(BSCVTY, "enable");
}
/* 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)
runs on BSSMAP_Emulation_CT return template PDU_BSSAP {
var template PDU_BSSAP resp := omit;
/* answer all RESET with a RESET ACK */
if (match(bssap, tr_BSSMAP_Reset)) {
resp := ts_BSSMAP_ResetAck;
}
return resp;
}
const BssmapOps MSC_BssmapOps := {
create_cb := refers(BSSMAP_Emulation.ExpectedCreateCallback),
unitdata_cb := refers(UnitdataCallback),
decode_dtap := false,
role_ms := false
}
const MGCPOps MSC_MGCPOps := {
create_cb := refers(MGCP_Emulation.ExpectedCreateCallback)
}
/* register an expect with the BSSMAP core */
private function f_create_bssmap_exp(octetstring l3_enc) runs on MSC_ConnHdlr {
BSSMAPEM.call(BSSMAPEM_register:{l3_enc, self}) {
[] BSSMAPEM.getreply(BSSMAPEM_register:{?, ?}) {};
}
}
type record TestHdlrParams {
OCT1 ra,
GsmFrameNumber fn,
hexstring imsi,
RslLinkId link_id
};
template (value) TestHdlrParams t_def_TestHdlrPars := {
ra := '23'O,
fn := 23,
imsi := '001019876543210'H,
link_id := valueof(ts_RslLinkID_DCCH(0))
}
function f_create_chan_and_exp(TestHdlrParams pars) runs on MSC_ConnHdlr {
var MobileIdentityLV mi := valueof(ts_MI_IMSI_LV(pars.imsi));
var PDU_ML3_MS_NW l3_info := valueof(ts_CM_SERV_REQ(CM_TYPE_MO_CALL, mi));
var octetstring l3_enc := enc_PDU_ML3_MS_NW(l3_info);
/* call helper function for CHAN_RQD -> IMM ASS ->EST_IND */
RSL_Emulation.f_chan_est(pars.ra, l3_enc, pars.link_id, pars.fn);
f_create_bssmap_exp(l3_enc);
}
function f_rsl_send_l3(template PDU_ML3_MS_NW l3, template (omit) RslLinkId link_id := omit,
template (omit) RslChannelNr chan_nr := omit) runs on MSC_ConnHdlr {
if (not isvalue(link_id)) {
link_id := ts_RslLinkID_DCCH(0);
}
if (not isvalue(chan_nr)) {
chan_nr := g_chan_nr;
}
RSL.send(ts_RSL_DATA_IND(valueof(chan_nr), valueof(link_id), enc_PDU_ML3_MS_NW(valueof(l3))));
}
function f_rsl_reply(template PDU_ML3_MS_NW l3, RSL_Message orig) runs on MSC_ConnHdlr {
var RslChannelNr chan_nr := orig.ies[0].body.chan_nr;
var RslLinkId link_id;
if (orig.msg_type == RSL_MT_ENCR_CMD) {
link_id := orig.ies[2].body.link_id;
} else {
link_id := orig.ies[1].body.link_id;
}
f_rsl_send_l3(l3, link_id, chan_nr);
}
/* Convert the chipher representation on BSSMAP to the representation used on RSL */
function f_chipher_mode_bssmap_to_rsl(OCT1 alg_bssmap) return OCT1
{
/* A5 0 */
if (alg_bssmap == '01'O) {
return '01'O;
}
/* A5 1 */
else if (alg_bssmap == '02'O) {
return '02'O;
}
/* A5 2 */
else if (alg_bssmap == '04'O) {
return '03'O;
}
/* A5 3 */
else if (alg_bssmap == '08'O) {
return '04'O;
}
/* A5 4 */
else if (alg_bssmap == '10'O) {
return '05'O;
}
/* A5 5 */
else if (alg_bssmap == '20'O) {
return '06'O;
}
/* A5 6 */
else if (alg_bssmap == '40'O) {
return '07'O;
}
/* A5 7 */
else if (alg_bssmap == '80'O) {
return '08'O;
} else {
setverdict(fail, "Unexpected Encryption Algorithm");
return '00'O;
}
}
function f_cipher_mode(OCT1 alg, OCT8 key, template OCT16 kc128 := omit, boolean exp_fail := false)
runs on MSC_ConnHdlr {
var PDU_BSSAP bssap;
var RSL_Message rsl;
var OCT1 alg_rsl;
if (isvalue(kc128)) {
BSSAP.send(ts_BSSMAP_CipherModeCmdKc128(alg, key, valueof(kc128)));
} else {
BSSAP.send(ts_BSSMAP_CipherModeCmd(alg, key));
}
/* RSL uses a different representation of the encryption algorithm,
* so we need to convert first */
alg_rsl := f_chipher_mode_bssmap_to_rsl(alg);
alt {
/* RSL/UE Side */
[] RSL.receive(tr_RSL_ENCR_CMD(g_chan_nr, ?, alg_rsl, key)) -> value rsl {
var PDU_ML3_NW_MS l3 := dec_PDU_ML3_NW_MS(rsl.ies[3].body.l3_info.payload);
log("Rx L3 from net: ", l3);
if (ischosen(l3.msgs.rrm.cipheringModeCommand)) {
f_rsl_reply(ts_RRM_CiphModeCompl, rsl);
}
repeat;
}
[] BSSAP.receive(tr_BSSMAP_CipherModeCompl) -> value bssap {
// bssap.bssmap.cipherModeComplete.chosenEncryptionAlgorithm.algoritmhIdentifier
if (exp_fail == true) {
setverdict(fail, "Unexpected Cipher Mode Complete");
} else {
setverdict(pass);
}
}
[] BSSAP.receive(tr_BSSMAP_CipherModeRej) -> value bssap {
if (exp_fail == false) {
setverdict(fail, "Ciphering Mode Reject");
} else {
setverdict(pass);
}
}
}
}
/* Convert from Ericsson ChanDesc2 format to Osmocom RslChannelNr format */
function f_ChDesc2RslChanNr(ChannelDescription2_V ch_desc, out RslChannelNr chan_nr, out GsmArfcn arfcn) {
var BIT5 inp := ch_desc.channelTypeandTDMAOffset;
chan_nr.tn := bit2int(ch_desc.timeslotNumber);
if (match(inp, '00001'B)) { /* TCH/F */
chan_nr.u.ch0 := RSL_CHAN_NR_Bm_ACCH;
}
else if (match(inp, '0001?'B)) { /* TCH/H */
chan_nr.u.lm.sub_chan := bit2int(substr(inp, 4, 1));
}
else if (match(inp, '001??'B)) { /* SDCCH/4 */
chan_nr.u.sdcch4.sub_chan := bit2int(substr(inp, 3, 2));
}
else if (match(inp, '01???'B)) { /* SDCCH/8 */
chan_nr.u.sdcch8.sub_chan := bit2int(substr(inp, 2, 3));
}
else {
setverdict(fail, "Unknown ChDesc!");
self.stop;
}
if (ch_desc.octet3 and4b '10'O == '10'O) {
setverdict(fail, "No support for Hopping");
self.stop;
} else {
var OCT2 concat := ch_desc.octet3 & ch_desc.octet4;
arfcn := oct2int(concat);
}
}
type record AssignmentState {
/* global */
boolean voice_call,
boolean is_assignment,
/* Assignment related bits */
boolean rr_ass_cmpl_seen,
boolean assignment_done,
RslChannelNr old_chan_nr,
/* Modify related bits */
boolean rr_modify_seen,
boolean modify_done
}
template (value) AssignmentState ts_AssignmentStateInit := {
voice_call := false,
is_assignment := false,
rr_ass_cmpl_seen := false,
assignment_done := false,
old_chan_nr := -,
rr_modify_seen := false,
modify_done := false
}
altstep as_assignment(inout AssignmentState st) runs on MSC_ConnHdlr {
var RSL_Message rsl;
[not st.rr_ass_cmpl_seen] RSL.receive(tr_RSL_DATA_REQ(g_chan_nr)) -> value rsl {
var PDU_ML3_NW_MS l3 := dec_PDU_ML3_NW_MS(rsl.ies[2].body.l3_info.payload);
log("Rx L3 from net: ", l3);
if (ischosen(l3.msgs.rrm.assignmentCommand)) {
var RslChannelNr new_chan_nr;
var GsmArfcn arfcn;
f_ChDesc2RslChanNr(l3.msgs.rrm.assignmentCommand.descrOf1stChAfterTime,
new_chan_nr, arfcn);
/* FIXME: Determine TRX NR by ARFCN, instead of hard-coded TRX0! */
/* register our component for this channel number at the RSL Emulation */
f_rslem_register(0, new_chan_nr);
var PDU_ML3_MS_NW l3_tx := valueof(ts_RRM_AssignmentComplete('00'O));
/* send assignment complete over the new channel */
RSL.send(ts_RSL_DATA_IND(new_chan_nr, valueof(ts_RslLinkID_DCCH(0)),
enc_PDU_ML3_MS_NW(l3_tx)));
/* by default, send via the new channel from now */
st.old_chan_nr := g_chan_nr;
g_chan_nr := new_chan_nr;
st.rr_ass_cmpl_seen := true;
repeat;
} else {
setverdict(fail, "Unexpected L3 received", l3);
self.stop;
}
}
[st.rr_ass_cmpl_seen] RSL.receive(tr_RSL_REL_REQ(st.old_chan_nr, tr_RslLinkID_DCCH(0))) {
RSL.send(ts_RSL_REL_CONF(st.old_chan_nr, valueof(ts_RslLinkID_DCCH(0))));
repeat;
}
[st.rr_ass_cmpl_seen] RSL.receive(tr_RSL_RF_CHAN_REL(st.old_chan_nr)) {
RSL.send(ts_RSL_RF_CHAN_REL_ACK(st.old_chan_nr));
/* unregister for old channel number in RSL emulation */
/* FIXME: Determine TRX NR by ARFCN, instead of hard-coded TRX0! */
f_rslem_unregister(0, st.old_chan_nr);
st.assignment_done := true;
repeat;
}
}
altstep as_modify(inout AssignmentState st) runs on MSC_ConnHdlr {
/* no assignment, just mode modify */
var RSL_Message rsl;
[st.voice_call and not st.rr_modify_seen] RSL.receive(tr_RSL_DATA_REQ(g_chan_nr)) -> value rsl {
var PDU_ML3_NW_MS l3 := dec_PDU_ML3_NW_MS(rsl.ies[2].body.l3_info.payload);
log("Rx L3 from net: ", l3);
if (ischosen(l3.msgs.rrm.channelModeModify)) {
f_rsl_reply(ts_RRM_ModeModifyAck(l3.msgs.rrm.channelModeModify.channelDescription,
l3.msgs.rrm.channelModeModify.channelMode), rsl);
st.rr_modify_seen := true;
}
repeat;
}
[st.voice_call and st.rr_modify_seen] RSL.receive(tr_RSL_MsgTypeD(RSL_MT_MODE_MODIFY_REQ)) -> value rsl {
RSL.send(ts_RSL_MODE_MODIFY_ACK(g_chan_nr));
st.modify_done := true;
repeat;
}
}
/* Determine if given rsl_chan_nr is compatible with given BSSMAP ChannelType */
function f_channel_compatible(BSSMAP_IE_ChannelType bssmap, RslChannelNr rsl_chan_nr)
return boolean {
select (bssmap.speechOrDataIndicator) {
case ('0011'B) { /* Signalling */
/* all channels support signalling */
return true;
}
case else { /* Speech, Speech+CTM or CSD */
select (bssmap.channelRateAndType) {
case ('08'O) { /* TCH/F */
select (rsl_chan_nr) {
case (t_RslChanNr_Bm(?)) { return true; }
}
}
case ('09'O) { /* TCH/H */
select (rsl_chan_nr) {
case (t_RslChanNr_Lm(?, ?)) { return true; }
}
}
case else { /* full or half-rate */
select (rsl_chan_nr) {
case (t_RslChanNr_Bm(?)) { return true; }
case (t_RslChanNr_Lm(?, ?)) { return true; }
}
}
}
}
}
return false;
}
/* establish a channel fully, expecting an assignment matching 'exp' */
function f_establish_fully(TestHdlrParams pars, PDU_BSSAP ass_cmd, template PDU_BSSAP exp_ass_cpl)
runs on MSC_ConnHdlr return PDU_BSSAP {
var PDU_BSSAP bssap;
timer T := 10.0;
var boolean exp_compl := ischosen(exp_ass_cpl.pdu.bssmap.assignmentComplete);
var boolean exp_fail := ischosen(exp_ass_cpl.pdu.bssmap.assignmentFailure);
var ExpectCriteria mgcpcrit := {
connid := omit,
endpoint := omit,
transid := omit
};
var AssignmentState st := valueof(ts_AssignmentStateInit);
/* if the channel type is SIGNAL, we're not handling a voice call */
if (ass_cmd.pdu.bssmap.assignmentRequest.channelType.speechOrDataIndicator != '0011'B) {
st.voice_call := true;
}
/* determine if the current channel can support the given service or not */
if (not f_channel_compatible(ass_cmd.pdu.bssmap.assignmentRequest.channelType, g_chan_nr)) {
st.is_assignment := true;
}
f_MscConnHdlr_init(1, "127.0.0.2", "127.0.0.3");
f_create_chan_and_exp(pars);
/* we should now have a COMPL_L3 at the MSC */
BSSAP.receive(tr_BSSMAP_ComplL3);
f_create_mgcp_expect(mgcpcrit);
BSSAP.send(ass_cmd);
T.start;
alt {
/* assignment related bits */
[st.is_assignment] as_assignment(st);
/* modify related bits */
[not st.is_assignment] as_modify(st);
/* voice call related bits (IPA CRCX/MDCX + MGCP) */
[st.voice_call] as_Media();
/* if we receive exactly what we expected, always return + pass */
[st.is_assignment and st.assignment_done or
(not st.is_assignment and st.modify_done)] BSSAP.receive(exp_ass_cpl) -> value bssap {
setverdict(pass);
}
[exp_fail] BSSAP.receive(exp_ass_cpl) -> value bssap {
setverdict(pass);
}
[(st.is_assignment and st.assignment_done or
(not st.is_assignment and st.modify_done)) and
exp_compl] BSSAP.receive(tr_BSSMAP_AssignmentComplete) {
setverdict(fail, "Received non-matching ASSIGNMENT COMPLETE");
}
[exp_compl] BSSAP.receive(tr_BSSMAP_AssignmentFail) {
setverdict(fail, "Received unexpected ASSIGNMENT FAIL");
}
[not exp_compl] BSSAP.receive(tr_BSSMAP_AssignmentComplete) {
setverdict(fail, "Received unexpected ASSIGNMENT COMPLETE");
}
[not exp_compl] BSSAP.receive(tr_BSSMAP_AssignmentFail) {
setverdict(fail, "Received non-matching ASSIGNMENT FAIL");
}
[] T.timeout {
setverdict(inconc, "Timeout waiting for ASSIGNMENT COMPLETE");
}
}
log("g_media ", g_media);
if (not isbound(bssap)) {
self.stop;
}
return bssap;
}
type record HandoverState {
/* Assignment related bits */
boolean rr_ho_cmpl_seen,
boolean handover_done,
RslChannelNr old_chan_nr
};
altstep as_handover(inout HandoverState st) runs on MSC_ConnHdlr {
var RSL_Message rsl;
[not st.rr_ho_cmpl_seen] RSL.receive(tr_RSL_DATA_REQ(g_chan_nr)) -> value rsl {
var PDU_ML3_NW_MS l3 := dec_PDU_ML3_NW_MS(rsl.ies[2].body.l3_info.payload);
log("Rx L3 from net: ", l3);
if (ischosen(l3.msgs.rrm.handoverCommand)) {
var RslChannelNr new_chan_nr;
var GsmArfcn arfcn;
f_ChDesc2RslChanNr(l3.msgs.rrm.handoverCommand.channelDescription2,
new_chan_nr, arfcn);
/* FIXME: Determine TRX NR by ARFCN, instead of hard-coded TRX0! */
/* register our component for this channel number at the RSL Emulation */
f_rslem_register(0, new_chan_nr, RSL1_PROC);
/* resume processing of RSL DChan messages, which was temporarily suspended
* before performing a hand-over */
f_rslem_resume(RSL1_PROC);
/* send handover complete over the new channel */
var PDU_ML3_MS_NW l3_tx := valueof(ts_RRM_HandoverComplete('00'O));
RSL1.send(ts_RSL_DATA_IND(new_chan_nr, valueof(ts_RslLinkID_DCCH(0)),
enc_PDU_ML3_MS_NW(l3_tx)));
/* by default, send via the new channel from now */
st.old_chan_nr := g_chan_nr;
g_chan_nr := new_chan_nr;
st.rr_ho_cmpl_seen := true;
repeat;
} else {
setverdict(fail, "Unexpected L3 received", l3);
self.stop;
}
}
[st.rr_ho_cmpl_seen] as_Media();
[st.rr_ho_cmpl_seen] RSL.receive(tr_RSL_REL_REQ(st.old_chan_nr, tr_RslLinkID_DCCH(0))) {
RSL.send(ts_RSL_REL_CONF(st.old_chan_nr, valueof(ts_RslLinkID_DCCH(0))));
repeat;
}
[st.rr_ho_cmpl_seen] RSL.receive(tr_RSL_RF_CHAN_REL(st.old_chan_nr)) {
RSL.send(ts_RSL_RF_CHAN_REL_ACK(st.old_chan_nr));
/* unregister for old channel number in RSL emulation */
/* FIXME: Determine TRX NR by ARFCN, instead of hard-coded TRX0! */
f_rslem_unregister(0, st.old_chan_nr);
st.handover_done := true;
repeat;
}
}
}
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