module MSC_ConnectionHandler { /* MSC Connection HAndler of BSC Tests in TTCN-3 * (C) 2017-2019 Harald Welte * contributions by sysmocom - s.f.m.c. GmbH * All rights reserved. * * Released under the terms of GNU General Public License, Version 2 or * (at your option) any later version. * * SPDX-License-Identifier: GPL-2.0-or-later */ import from Misc_Helpers all; import from General_Types all; import from Osmocom_Types all; import from GSM_Types all; import from IPA_Emulation all; import from SCCPasp_Types all; import from BSSAP_Types all; import from RAN_Emulation all; import from BSSAP_LE_Emulation all; import from BSSAP_LE_Types all; import from BSSMAP_LE_Templates all; import from BSSMAP_Templates all; import from IPL4asp_Types all; import from Native_Functions all; import from MGCP_CodecPort all; import from MGCP_Types all; import from MGCP_Templates all; import from MGCP_Emulation all; import from SDP_Types all; import from SDP_Templates all; import from StatsD_Checker 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; import from TCCConversion_Functions all; /*********************************************************************** * Media related handling ***********************************************************************/ /* TODO: import OSMUX_Types.ttcn */ type INT1 OsmuxCID (0 .. 255); /* Get the matching payload type for a specified BSSAP codec type * (see also: BSSAP_Types.ttcn */ private function f_get_mgcp_pt(BSSMAP_FIELD_CodecType codecType) return SDP_FIELD_PayloadType { if (codecType == GSM_FR) { return PT_GSM; } else if (codecType == GSM_HR) { return PT_GSMHR; } else if (codecType == GSM_EFR) { return PT_GSMEFR; } else if (codecType == FR_AMR or codecType == HR_AMR) { return PT_AMR; } else if (codecType == FR_AMR_WB or codecType == OHR_AMR or codecType == OFR_AMR_WB or codecType == OHR_AMR_WB) { return PT_AMRWB; } return PT_PCMU; } /* Tuple containing host/ip and port */ type record HostPort { HostName host, PortNumber port_nr }; /* State encapsulating one MGCP Connection */ type record MgcpConnState { integer crcx_seen, /* Counts how many CRCX operations happend */ integer mdcx_seen, /* Counts how many MDCX operations happend C */ integer crcx_seen_exp, /* Sets the expected number of CRCX operations */ integer mdcx_seen_exp, /* Sets the expected number of MDCX operations */ 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 */ OsmuxCID local_osmux_cid optional, OsmuxCID remote_osmux_cid optional }; /* BTS media state */ type record BtsMediaState { boolean ipa_crcx_seen, boolean ipa_mdcx_seen, uint16_t conn_id, uint7_t rtp_pt, HostPort bts, HostPort peer, OsmuxCID local_osmux_cid optional, OsmuxCID remote_osmux_cid optional }; 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, BSSMAP_FIELD_CodecType codecType) { /* BTS Side */ g_media.bts := { ipa_crcx_seen := false, ipa_mdcx_seen := false, conn_id := nr, rtp_pt := 0, bts := { host := bts, port_nr := 9000 + nr*2 }, peer := -, local_osmux_cid := nr, remote_osmux_cid := omit } g_media.bts1 := { ipa_crcx_seen := false, ipa_mdcx_seen := false, conn_id := nr, rtp_pt := 0, bts := { host := bts, /* FIXME */ port_nr := 9000 + nr*2 }, peer := -, local_osmux_cid := nr, remote_osmux_cid := omit } 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 := f_encoding_name_from_pt(f_get_mgcp_pt(codecType)); g_media.mgcp_conn[i].sample_rate := 8000; g_media.mgcp_conn[i].ptime := 20; g_media.mgcp_conn[i].rtp_pt := enum2int(f_get_mgcp_pt(codecType)); g_media.mgcp_conn[i].crcx_seen := 0; g_media.mgcp_conn[i].mdcx_seen := 0; g_media.mgcp_conn[i].crcx_seen_exp := 0; g_media.mgcp_conn[i].mdcx_seen_exp := 0; g_media.mgcp_conn[i].conn_id := f_mgcp_alloc_conn_id(); g_media.mgcp_conn[i].local_osmux_cid := i; g_media.mgcp_conn[i].remote_osmux_cid := omit; } 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 } } /* Helper function to get the next free MGCP connection identifier. We can * recognize free connection identifiers by the fact that no CRCX happend yet */ 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 >= 1) { return i; } } Misc_Helpers.f_shutdown(__BFILE__, __LINE__, fail, "Only 2 Connections per EP!"); /* Should never be reached */ return -1; } /* Helper function to pick a specific connection by its cid. Since we reach out * for a connection that is in-use we also check if there was already exactly * one CRCX happening on that connection. */ 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 == 1) { return i; } } Misc_Helpers.f_shutdown(__BFILE__, __LINE__, fail, log2str("No Connection for ID ", cid)); /* Should not be reached */ return -1; } /* Verify that CSD CRCX/MDCX has the RSL_IE_IPAC_RTP_CSD_FMT IE, and that * inside it the D value is set to RSL_IPA_RTP_CSD_TRAU_BTS. */ private function f_ipacc_crcx_mdcx_check_rtp_pt_csd(RSL_Message rsl) runs on MSC_ConnHdlr { var SDP_FIELD_PayloadType pt_csd := PT_CSD; var RSL_IE_Body ie; if (g_media.bts.rtp_pt != enum2int(pt_csd)) { return; } if (f_rsl_find_ie(rsl, RSL_IE_IPAC_RTP_CSD_FMT, ie)) { if (ie.ipa_rtp_csd_fmt.d != RSL_IPA_RTP_CSD_TRAU_BTS) { Misc_Helpers.f_shutdown(__BFILE__, __LINE__, fail, "Rx unexpected IPAC CRCX for CSD with RTP_CSD_FMT IE"); } return; } Misc_Helpers.f_shutdown(__BFILE__, __LINE__, fail, "Rx unexpected IPAC CRCX for CSD without RTP_CSD_FMT IE"); } /* altstep for handling of IPACC media related commands. Activated by as_Media() to test * RSL level media handling */ altstep as_Media_ipacc(RSL_DCHAN_PT rsl_pt := RSL, RSL_DCHAN_PT rsl_pt_ho_target := RSL1) runs on MSC_ConnHdlr { var RSL_Message rsl; var RSL_IE_Body ie; var boolean b_unused; [not g_media.bts.ipa_crcx_seen] rsl_pt.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; } if (f_rsl_find_ie(rsl, RSL_IE_OSMO_OSMUX_CID, ie)) { if (not g_pars.use_osmux_bts) { Misc_Helpers.f_shutdown(__BFILE__, __LINE__, fail, "Rx unexpected IPAC CRCX with Osmux CID IE"); } g_media.bts.remote_osmux_cid := ie.osmux_cid.cid; } else { if (g_pars.use_osmux_bts) { Misc_Helpers.f_shutdown(__BFILE__, __LINE__, fail, "Rx unexpected IPAC CRCX without Osmux CID IE"); } g_media.bts.local_osmux_cid := omit; g_media.bts.remote_osmux_cid := omit; } f_ipacc_crcx_mdcx_check_rtp_pt_csd(rsl); rsl_pt.send(ts_RSL_IPA_CRCX_ACK(g_chan_nr, g_media.bts.conn_id, f_inet_addr(g_media.bts.bts.host), g_media.bts.bts.port_nr, g_media.bts.rtp_pt, g_media.bts.local_osmux_cid)); g_media.bts.ipa_crcx_seen := true; repeat; } [g_media.bts.ipa_crcx_seen] rsl_pt.receive(tr_RSL_IPA_MDCX(g_chan_nr, ?)) -> value rsl{ /* Extract conn_id, ip, port, rtp_pt2 from request + use in response */ b_unused := f_rsl_find_ie(rsl, RSL_IE_IPAC_CONN_ID, ie); if (g_media.bts.conn_id != ie.ipa_conn_id) { Misc_Helpers.f_shutdown(__BFILE__, __LINE__, fail, log2str("IPA MDCX for unknown ConnId", rsl)); } /* mandatory */ b_unused := f_rsl_find_ie(rsl, RSL_IE_IPAC_REMOTE_IP, ie); g_media.bts.peer.host := f_inet_ntoa(ie.ipa_remote_ip); b_unused := 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; } if (f_rsl_find_ie(rsl, RSL_IE_OSMO_OSMUX_CID, ie)) { if (not g_pars.use_osmux_bts) { Misc_Helpers.f_shutdown(__BFILE__, __LINE__, fail, "Rx unexpected IPAC MDCX with Osmux CID IE"); } g_media.bts.remote_osmux_cid := ie.osmux_cid.cid; } else { if (g_pars.use_osmux_bts) { Misc_Helpers.f_shutdown(__BFILE__, __LINE__, fail, "Rx unexpected IPAC MDCX without Osmux CID IE"); } g_media.bts.local_osmux_cid := omit; g_media.bts.remote_osmux_cid := omit; } f_ipacc_crcx_mdcx_check_rtp_pt_csd(rsl); rsl_pt.send(ts_RSL_IPA_MDCX_ACK(g_chan_nr, g_media.bts.conn_id, f_inet_addr(g_media.bts.peer.host), g_media.bts.peer.port_nr, g_media.bts.rtp_pt, g_media.bts.local_osmux_cid)); g_media.bts.ipa_mdcx_seen := true; repeat; } /* on second (new) BTS during hand-over */ [not g_media.bts1.ipa_crcx_seen] rsl_pt_ho_target.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; } if (f_rsl_find_ie(rsl, RSL_IE_OSMO_OSMUX_CID, ie)) { if (not g_pars.use_osmux_bts) { Misc_Helpers.f_shutdown(__BFILE__, __LINE__, fail, "Rx unexpected IPAC CRCX with Osmux CID IE"); } g_media.bts.remote_osmux_cid := ie.osmux_cid.cid; } else { if (g_pars.use_osmux_bts) { Misc_Helpers.f_shutdown(__BFILE__, __LINE__, fail, "Rx unexpected IPAC CRCX without Osmux CID IE"); } g_media.bts.local_osmux_cid := omit; g_media.bts.remote_osmux_cid := omit; } rsl_pt_ho_target.send(ts_RSL_IPA_CRCX_ACK(g_chan_nr, g_media.bts1.conn_id, f_inet_addr(g_media.bts1.bts.host), g_media.bts1.bts.port_nr, g_media.bts1.rtp_pt, g_media.bts.local_osmux_cid)); g_media.bts1.ipa_crcx_seen := true; repeat; } /* on second (new) BTS during hand-over */ [g_media.bts1.ipa_crcx_seen] rsl_pt_ho_target.receive(tr_RSL_IPA_MDCX(g_chan_nr, ?)) -> value rsl{ /* Extract conn_id, ip, port, rtp_pt2 from request + use in response */ b_unused := f_rsl_find_ie(rsl, RSL_IE_IPAC_CONN_ID, ie); if (g_media.bts1.conn_id != ie.ipa_conn_id) { Misc_Helpers.f_shutdown(__BFILE__, __LINE__, fail, log2str("IPA MDCX for unknown ConnId", rsl)); } /* mandatory */ b_unused := f_rsl_find_ie(rsl, RSL_IE_IPAC_REMOTE_IP, ie); g_media.bts1.peer.host := f_inet_ntoa(ie.ipa_remote_ip); b_unused := 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; } if (f_rsl_find_ie(rsl, RSL_IE_OSMO_OSMUX_CID, ie)) { if (not g_pars.use_osmux_bts) { Misc_Helpers.f_shutdown(__BFILE__, __LINE__, fail, "Rx unexpected IPAC MDCX with Osmux CID IE"); } g_media.bts.remote_osmux_cid := ie.osmux_cid.cid; } else { if (g_pars.use_osmux_bts) { Misc_Helpers.f_shutdown(__BFILE__, __LINE__, fail, "Rx unexpected IPAC MDCX without Osmux CID IE"); } g_media.bts.local_osmux_cid := omit; g_media.bts.remote_osmux_cid := omit; } rsl_pt_ho_target.send(ts_RSL_IPA_MDCX_ACK(g_chan_nr, g_media.bts1.conn_id, f_inet_addr(g_media.bts1.peer.host), g_media.bts1.peer.port_nr, g_media.bts1.rtp_pt, g_media.bts.local_osmux_cid)); g_media.bts1.ipa_mdcx_seen := true; repeat; } } function f_rx_crcx(MgcpCommand mgcp_cmd) runs on MSC_ConnHdlr return template MgcpResponse { var SDP_Message sdp; var integer cid := f_get_free_mgcp_conn(); var charstring local_rtp_addr; var MgcpOsmuxCID osmux_cid; if (g_pars.media_mgw_offer_ipv6 == true) { local_rtp_addr := host_mgw_rtp_v6; /* Use IPv6 by default if no remote addr is provided by client */ } else { local_rtp_addr := host_mgw_rtp_v4; /* Use IPv4 by default if no remote addr is provided by client */ } if (match(mgcp_cmd.line.ep, t_MGCP_EP_wildcard)) { if (cid != 0) { Misc_Helpers.f_shutdown(__BFILE__, __LINE__, fail, "MGCP wildcard EP only works in first CRCX"); } /* 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; if (sdp.connection.addr_type == "IP6") { local_rtp_addr := host_mgw_rtp_v6; } else { local_rtp_addr := host_mgw_rtp_v4; } } var MgcpConnState mgcp_conn := g_media.mgcp_conn[cid]; sdp := valueof(ts_SDP(mgcp_conn.mgw.host, local_rtp_addr, "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; if ((g_pars.use_osmux_cn or g_pars.use_osmux_bts) and f_MgcpCmd_contains_par(mgcp_cmd, "X-OSMUX")) { osmux_cid := f_MgcpCmd_extract_osmux_cid(mgcp_cmd); if (osmux_cid != -1) { mgcp_conn.remote_osmux_cid := osmux_cid; } mgcp_resp := ts_CRCX_ACK_osmux(mgcp_cmd.line.trans_id, mgcp_conn.conn_id, mgcp_conn.local_osmux_cid, sdp); } else { 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)); g_media.mgcp_conn[cid].crcx_seen := g_media.mgcp_conn[cid].crcx_seen + 1; return mgcp_resp; } function f_rx_mdcx(MgcpCommand mgcp_cmd) runs on MSC_ConnHdlr return template MgcpResponse { var SDP_Message sdp; var integer cid := f_get_mgcp_conn(f_MgcpCmd_extract_conn_id(mgcp_cmd)); var charstring local_rtp_addr; 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; if (sdp.connection.addr_type == "IP6") { local_rtp_addr := host_mgw_rtp_v6; } else { local_rtp_addr := host_mgw_rtp_v4; } } else { Misc_Helpers.f_shutdown(__BFILE__, __LINE__, fail, "MDCX has no [recognizable] SDP"); } var MgcpConnState mgcp_conn := g_media.mgcp_conn[cid]; sdp := valueof(ts_SDP(mgcp_conn.peer.host, local_rtp_addr, "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)) } )); g_media.mgcp_conn[cid].mdcx_seen := g_media.mgcp_conn[cid].mdcx_seen + 1; return ts_MDCX_ACK(mgcp_cmd.line.trans_id, mgcp_conn.conn_id, sdp); } function tr_MGCP_RecvFrom_any(template MgcpMessage msg) runs on MSC_ConnHdlr return template MGCP_RecvFrom { var template MGCP_RecvFrom mrf := { connId := ?, remName := ?, remPort := ?, locName := ?, locPort := ?, msg := msg } return mrf; } /* altstep for handling of MGCP media related commands. Activated by as_Media() to test * MGW level media handling */ altstep as_Media_mgw(boolean norepeat := false) runs on MSC_ConnHdlr { var MgcpCommand mgcp_cmd; var template MgcpResponse mgcp_resp; var MGCP_RecvFrom mrf; var template MgcpMessage msg_crcx := { command := tr_CRCX } var template MgcpMessage msg_mdcx := { command := tr_MDCX } var template MgcpMessage msg_dlcx := { command := tr_DLCX } var template MgcpMessage msg_resp; [g_pars.aoip] MGCP.receive(tr_CRCX) -> value mgcp_cmd { mgcp_resp := f_rx_crcx(mgcp_cmd); MGCP.send(mgcp_resp); if(norepeat == false) { repeat; } } [not g_pars.aoip] MGCP_MULTI.receive(tr_MGCP_RecvFrom_any(msg_crcx)) -> value mrf { mgcp_resp := f_rx_crcx(mrf.msg.command); msg_resp := { response := mgcp_resp } MGCP_MULTI.send(t_MGCP_SendToMrf(mrf, msg_resp)); if(norepeat == false) { repeat; } } [g_pars.aoip and not g_pars.ignore_mgw_mdcx] MGCP.receive(tr_MDCX) -> value mgcp_cmd { mgcp_resp := f_rx_mdcx(mgcp_cmd); MGCP.send(mgcp_resp); if(norepeat == false) { repeat; } } [not g_pars.aoip and not g_pars.ignore_mgw_mdcx] MGCP_MULTI.receive(tr_MGCP_RecvFrom_any(msg_mdcx)) -> value mrf { mgcp_resp := f_rx_mdcx(mrf.msg.command); msg_resp := { response := mgcp_resp } MGCP_MULTI.send(t_MGCP_SendToMrf(mrf, msg_resp)); if(norepeat == false) { repeat; } } [g_pars.fail_on_dlcx and g_pars.aoip] MGCP.receive(tr_DLCX) { setverdict(fail, "Unexpected DLCX received"); } [g_pars.fail_on_dlcx and not g_pars.aoip] MGCP_MULTI.receive(tr_MGCP_RecvFrom_any(msg_dlcx)) { setverdict(fail, "Unexpected DLCX received"); } } /* Altsteps for handling of 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 { [not g_pars.ignore_ipa_media] as_Media_ipacc(); [] as_Media_mgw(); } type port Coord_PT message { inout charstring; } with { extension "internal" }; /* 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 */ type component MSC_ConnHdlr extends RAN_ConnHdlr, RSL_DchanHdlr, MGCP_ConnHdlr, BSSAP_LE_ConnHdlr, StatsD_ConnHdlr { /* SCCP Connecction Identifier for the underlying SCCP connection */ var integer g_sccp_conn_id; /* procedure port back to our parent (RAN_Emulation_CT) for control */ port RAN_PROC_PT RAN; port TELNETasp_PT BSCVTY; port Coord_PT COORD; port Coord_PT COORD2; /* Proxy MGCP-over-IPA and MGCP-over-UDP */ port IPA_MGCP_PT MGCP_MSC_CLIENT; var integer g_trans_id := 0; var MediaState g_media; var TestHdlrParams g_pars; var charstring host_bts := "127.0.0.2"; var charstring host_mgw_mgcp := "127.0.0.3"; var charstring host_mgw_rtp_v4 := "127.0.0.5"; var charstring host_mgw_rtp_v6 := "::1"; var charstring host_msc := "127.0.0.4"; var boolean g_vty_initialized := false; } function f_MscConnHdlr_init_vty() runs on MSC_ConnHdlr { if (not g_vty_initialized) { map(self:BSCVTY, system:BSCVTY); f_vty_set_prompts(BSCVTY); f_vty_transceive(BSCVTY, "enable"); g_vty_initialized := true; } } /* initialize all parameters */ function f_MscConnHdlr_init(integer i, HostName bts, HostName mgw, BSSMAP_FIELD_CodecType codecType) runs on MSC_ConnHdlr { g_trans_id := i * 1000; /* Avoid different MscConnHdlr submitting same trans_id over MGCP-IPA */ f_MediaState_init(g_media, i, bts, mgw, codecType); f_MscConnHdlr_init_vty(); } private function get_next_trans_id() runs on MSC_ConnHdlr return MgcpTransId { var MgcpTransId tid := int2str(g_trans_id); g_trans_id := g_trans_id + 1; return tid; } /* Callback function from general RAN_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 RAN_Emulation_CT return template PDU_BSSAP { var template PDU_BSSAP resp := omit; var boolean append_osmux_support := g_ran_ops.use_osmux and (g_ran_ops.transport == BSSAP_TRANSPORT_AoIP); /* answer all RESET with a RESET ACK */ if (match(bssap, tr_BSSMAP_Reset(append_osmux_support))) { resp := ts_BSSMAP_ResetAck(append_osmux_support); } return resp; } /* Callback function from general BSSAP_LE_Emulation whenever a connectionless * BSSAP_LE message arrives. Can return a PDU_BSSAP_LE that should be sent in return */ private function BSSAP_LE_UnitdataCallback(PDU_BSSAP_LE bssap) runs on BSSAP_LE_Emulation_CT return template PDU_BSSAP_LE { var template PDU_BSSAP_LE resp := omit; /* answer all RESET with a RESET ACK */ if (match(bssap, tr_BSSMAP_LE_Reset)) { resp := ts_BSSMAP_LE_ResetAck; } return resp; } const RanOps MSC_RanOps := { create_cb := refers(RAN_Emulation.ExpectedCreateCallback), unitdata_cb := refers(UnitdataCallback), decode_dtap := false, role_ms := false, protocol := RAN_PROTOCOL_BSSAP, transport := BSSAP_TRANSPORT_AoIP, use_osmux := false, bssap_reset_retries := 1, sccp_addr_local := omit, sccp_addr_peer := omit } const BssapLeOps SMLC_BssapLeOps := { create_cb := refers(BSSAP_LE_Emulation.ExpectedCreateCallback), unitdata_cb := refers(BSSAP_LE_UnitdataCallback), decode_dtap := false, role_ms := false, sccp_addr_local := omit, sccp_addr_peer := omit } const MGCPOps MSC_MGCPOps := { create_cb := refers(MGCP_Emulation.ExpectedCreateCallback), unitdata_cb := refers(MGCP_Emulation.DummyUnitdataCallback) } /* register an expect with the BSSMAP core */ function f_create_bssmap_exp(octetstring l3_enc) runs on MSC_ConnHdlr { RAN.call(RAN_register:{l3_enc, self}) { [] RAN.getreply(RAN_register:{?, ?}) {}; } } type record TestHdlrEncrParams { /* A mask of multiple encryption algorithms, for Encryption Information IE. */ OCT1 enc_alg_permitted, /* Expect this encryption algorithm in Channel Activation from the BSC. * To expect no encryption, set to '01'O == A5/0. */ OCT1 enc_alg_expect, /* In BSSMAP, the Chosen Encryption Algorithm IE that the test sends to the BSC. * When set to omit, the MSC will not send a Chosen Encryption Algorithm IE. */ OCT1 enc_alg_chosen optional, octetstring enc_key, octetstring enc_kc128 optional }; template (value) TestHdlrEncrParams t_EncrParams(OCT1 alg_permitted, octetstring key, template (omit) octetstring kc128 := omit) := { enc_alg_permitted := alg_permitted, enc_alg_expect := alg_permitted, /* <- for compat with tests before enc_alg_expect was added */ enc_alg_chosen := alg_permitted, /* <- for compat with tests before enc_alg_chosen was added */ enc_key := key, enc_kc128 := kc128 } template (value) TestHdlrEncrParams t_EncrParams2(OCT1 alg_permitted, OCT1 alg_expect, template(omit) OCT1 alg_chosen, octetstring key, template (omit) octetstring kc128 := omit) := { enc_alg_permitted := alg_permitted, enc_alg_expect := alg_expect, enc_alg_chosen := alg_chosen, enc_key := key, enc_kc128 := kc128 } /* Convenience for common t_EncrParams2 usage. * * To test a scenario where only A5/3 is permitted: * f_encr_params('08'O); * To test a scenario where A5/3 is chosen from A5/0,A5/1,A5/3 (1 | 2 | 8 = 11 = 0xb): * f_encr_params('0b'O, '08'O); * To test the same, but the Chosen Encryption Algorithm IE should reflect A5/1: * f_encr_params('0b'O, '08'O, '02'O); * To test the same, but the MSC sends no Chosen Encryption Algorithm IE: * f_encr_params('0b'O, '08'O, omit); * * Set alg_chosen and alg_expect magically when == '00'O: * - enc_alg_expect is set to alg_chosen if present, else to alg_permitted. * - enc_alg_chosen is set to alg_permitted. * When only alg_permitted is given, alg_permitted must reflect only one algorithm, or f_cipher_mode_bssmap_to_rsl() * will fail. * When alg_chosen is passed as omit, the messages from the MSC will not contain a Chosen Encryption Algorithm IE. */ function f_encr_params(OCT1 alg_permitted, OCT1 alg_expect := '00'O, template (omit) OCT1 alg_chosen := '00'O, boolean kc128 := false) return TestHdlrEncrParams { if (not istemplatekind(alg_chosen, "omit")) { if (valueof(alg_chosen) == '00'O) { if (alg_expect != '00'O) { alg_chosen := alg_expect; } else { /* In this case, alg_permitted should have only one permitted algo */ alg_chosen := alg_permitted; } } if (alg_expect == '00'O) { alg_expect := valueof(alg_chosen); } } if (alg_expect == '00'O) { /* In this case, alg_permitted should have only one permitted algo */ alg_expect := valueof(alg_permitted); } var template (omit) octetstring kc := omit; if (kc128) { kc := f_rnd_octstring(16); } return valueof(t_EncrParams2(alg_permitted, alg_expect, alg_chosen, f_rnd_octstring(8), kc)); } type record TestHdlrParamsLcls { GlobalCallReferenceValue gcr optional, /* LCLS Configuration */ BIT4 cfg optional, /* LCLS Connection Status Control */ BIT4 csc optional, BIT4 exp_sts optional, /* Whether to adjust *cx_seen_exp for LCLS tests */ boolean adjust_cx_exp } type record TestHdlrParamsMSCPool { integer bssap_idx, integer rsl_idx, PDU_ML3_MS_NW l3_info optional } type record ASCITest { boolean vgcs_setup_ok, boolean vgcs_assign_ok, boolean vgcs_assign_fail, boolean vgcs_talker_req, boolean vgcs_talker_fail, boolean vgcs_talker_est, boolean vgcs_talker_rel, boolean vgcs_uplink_reject, boolean vgcs_uplink_seized, boolean vgcs_uplink_release, boolean delay_bts, boolean delay_msc }; type record TestHdlrParams { OCT1 ra, GsmFrameNumber fn, hexstring imsi optional, hexstring imei optional, RslLinkId link_id, integer media_nr, /* determins MGCP EP, port numbers */ BSSMAP_IE_SpeechCodecList ass_codec_list optional, RSL_IE_Body expect_mr_conf_ie optional, /* typically present for AMR codecs */ bitstring expect_mr_s0_s7 optional, /* typically present for AMR codecs */ TestHdlrEncrParams encr optional, TestHdlrParamsLcls lcls, SCCP_PAR_Address sccp_addr_msc optional, SCCP_PAR_Address sccp_addr_bsc optional, uint5_t exp_ms_power_level, boolean exp_ms_power_params, boolean aoip, boolean use_osmux_cn, boolean use_osmux_bts, charstring host_aoip_tla, TestHdlrParamsMSCPool mscpool, integer mgwpool_idx, /* MGCP_Emulation_CT (vc_MGCP) to use for this MSC ConnHdlr */ boolean media_mgw_offer_ipv6, OCT3 last_used_eutran_plmn optional, boolean exp_fast_return, /* RR Release expected to contain CellSelectInd ? */ boolean expect_channel_mode_modify, uint3_t expect_tsc optional, BSSMAP_IE_CellIdentifier cell_id_source, boolean expect_ho_fail, boolean expect_ho_fail_lchan_est, boolean inter_bsc_ho_in__ho_req_in_initial_sccp_cr, boolean ignore_mgw_mdcx, boolean fail_on_dlcx, boolean ignore_ipa_media, ASCITest asci_test }; /* Note: Do not use valueof() to get a value of this template, use * f_gen_test_hdlr_pars() instead in order to get a configuration that is * matched to the current test situation (aoip vs. sccplite) */ template (value) TestHdlrParams t_def_TestHdlrPars := { ra := '23'O, fn := 23, imsi := omit, /* set to random in f_gen_test_hdlr_pars() */ imei := omit, /* set to random in f_gen_test_hdlr_pars() */ link_id := valueof(ts_RslLinkID_DCCH(0)), media_nr := 1, ass_codec_list := omit, expect_mr_conf_ie := omit, expect_mr_s0_s7 := omit, encr := omit, lcls := { gcr := omit, cfg := omit, csc := omit, exp_sts := omit, adjust_cx_exp := true }, sccp_addr_msc := omit, sccp_addr_bsc := omit, exp_ms_power_level := 7, /* calculated from osmo-bsc.cfg "ms max power" */ exp_ms_power_params := false, aoip := true, use_osmux_cn := false, use_osmux_bts := false, host_aoip_tla := "1.2.3.4", mscpool := { bssap_idx := 0, rsl_idx := 0, l3_info := omit }, mgwpool_idx := 0, media_mgw_offer_ipv6 := true, last_used_eutran_plmn := omit, exp_fast_return := false, expect_channel_mode_modify := false, expect_tsc := omit, cell_id_source := valueof(ts_CellID_LAC_CI(1, 1)), expect_ho_fail := false, expect_ho_fail_lchan_est := false, inter_bsc_ho_in__ho_req_in_initial_sccp_cr := true, ignore_mgw_mdcx := false, fail_on_dlcx := true, ignore_ipa_media := false, asci_test := { vgcs_setup_ok := false, vgcs_assign_ok := false, vgcs_assign_fail := false, vgcs_talker_req := false, vgcs_talker_fail := false, vgcs_talker_est := false, vgcs_talker_rel := false, vgcs_uplink_reject := false, vgcs_uplink_seized := false, vgcs_uplink_release := false, delay_bts := false, delay_msc := false } } function f_create_chan_and_exp(template (present) PDU_BSSAP exp_l3_compl := ?) runs on MSC_ConnHdlr { var MobileIdentityLV mi; var PDU_ML3_MS_NW l3_info; var octetstring l3_enc; var template uint3_t tsc := ?; timer T; if (ispresent(g_pars.imsi)) { mi := valueof(ts_MI_IMSI_LV(g_pars.imsi)); } else if (ispresent(g_pars.imei)) { mi := valueof(ts_MI_IMEI_LV(g_pars.imei)); } else { Misc_Helpers.f_shutdown(__BFILE__, __LINE__, fail, "Either imsi or imei must be set!"); } l3_info := valueof(ts_CM_SERV_REQ(CM_TYPE_MO_CALL, mi)); l3_enc := enc_PDU_ML3_MS_NW(l3_info); if (not istemplatekind(g_pars.expect_tsc, "omit")) { tsc := g_pars.expect_tsc; } if (istemplatekind(exp_l3_compl, "?")) { if (g_pars.aoip == false) { exp_l3_compl := tr_BSSMAP_ComplL3(l3_enc, codec_list := omit); } else { exp_l3_compl := tr_BSSMAP_ComplL3(l3_enc, codec_list := ?); } } f_create_bssmap_exp(l3_enc); /* call helper function for CHAN_RQD -> IMM ASS ->EST_IND */ RSL_Emulation.f_chan_est(g_pars.ra, l3_enc, g_pars.link_id, g_pars.fn, tsc); /* wait for a COMPL_L3 from the BSC to ensure that the SCCP connection is up */ T.start(2.0); alt { [] BSSAP.receive(exp_l3_compl); [] BSSAP.receive(tr_BSSMAP_ComplL3) { setverdict(fail, "Received non-matching COMPLETE LAYER 3 INFORMATION"); Misc_Helpers.f_shutdown(__BFILE__, __LINE__); } [] T.timeout { setverdict(fail, "Timeout waiting for COMPLETE LAYER 3 INFORMATION"); Misc_Helpers.f_shutdown(__BFILE__, __LINE__); } } } function f_rsl_send_l3(template PDU_ML3_MS_NW l3, template (omit) RslLinkId link_id := omit, template (omit) RslChannelNr chan_nr := omit, RSL_DCHAN_PT rsl_pt := RSL) 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_pt.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, RSL_DCHAN_PT rsl_pt := RSL) 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, rsl_pt := rsl_pt); } /* Convert the cipher representation on BSSMAP to the representation used on RSL */ function f_cipher_mode_bssmap_to_rsl(OCT1 alg_bssmap) return RSL_AlgId { select (alg_bssmap) { case ('01'O) { return RSL_ALG_ID_A5_0; } case ('02'O) { return RSL_ALG_ID_A5_1; } case ('04'O) { return RSL_ALG_ID_A5_2; } case ('08'O) { return RSL_ALG_ID_A5_3; } case ('10'O) { return RSL_ALG_ID_A5_4; } case ('20'O) { return RSL_ALG_ID_A5_5; } case ('40'O) { return RSL_ALG_ID_A5_6; } case ('80'O) { return RSL_ALG_ID_A5_7; } case else { Misc_Helpers.f_shutdown(__BFILE__, __LINE__, fail, "Unexpected Encryption Algorithm: " & oct2str(alg_bssmap)); return RSL_ALG_ID_A5_0; } } } /* Convert the cipher representation on BSSMAP to the one used on RR (3GPP TS 44.018) */ function f_cipher_mode_bssmap_to_rr(OCT1 alg_bssmap) return BIT3 { select (alg_bssmap) { case ('01'O) /* A5/0 */ { return '000'B; } /* SC=0 */ case ('02'O) /* A5/1 */ { return '000'B; } /* SC=1 */ case ('04'O) /* A5/2 */ { return '001'B; } /* SC=1 */ case ('08'O) /* A5/3 */ { return '010'B; } /* SC=1 */ case ('10'O) /* A5/4 */ { return '011'B; } /* SC=1 */ case ('20'O) /* A5/5 */ { return '100'B; } /* SC=1 */ case ('40'O) /* A5/6 */ { return '101'B; } /* SC=1 */ case ('80'O) /* A5/7 */ { return '110'B; } /* SC=1 */ case else { Misc_Helpers.f_shutdown(__BFILE__, __LINE__, fail, "Unexpected Encryption Algorithm: " & oct2str(alg_bssmap)); return '000'B; } } } function f_verify_encr_info(RSL_Message rsl) runs on MSC_ConnHdlr { var RSL_IE_Body encr_info; var RSL_AlgId alg_rsl; var template octetstring expect_kc; /* If no encryption is enabled, then make sure there is no RSL_IE_ENCR_INFO */ if (not ispresent(g_pars.encr)) { if (f_rsl_find_ie(rsl, RSL_IE_ENCR_INFO, encr_info)) { setverdict(fail, "Found Encryption IE, but expected no encryption in ", rsl.msg_type); Misc_Helpers.f_shutdown(__BFILE__, __LINE__); return; } setverdict(pass); return; } /* RSL uses a different representation of the encryption algorithm, * so we need to convert first */ alg_rsl := f_cipher_mode_bssmap_to_rsl(g_pars.encr.enc_alg_expect); if (alg_rsl == RSL_ALG_ID_A5_4 and ispresent(g_pars.encr.enc_kc128)) { expect_kc := g_pars.encr.enc_kc128; } else if (alg_rsl == RSL_ALG_ID_A5_0) { /* When A5/0 is chosen, no encryption is active, so technically, no key is needed. However, 3GPP TS * 48.058 9.3.7 Encryption Information stays quite silent about presence or absence of a key for A5/0. * The only thing specified is how to indicate the length of the key; the possibility that the key may * be zero length is not explicitly mentioned. So it seems that we should always send the key along, * even for A5/0. Still, let's also allow a zero length key for A5/0. */ expect_kc := (g_pars.encr.enc_key, ''O); } else { expect_kc := g_pars.encr.enc_key; } log("for encryption algo ", alg_rsl, " expect kc = ", expect_kc); if (not f_rsl_find_ie(rsl, RSL_IE_ENCR_INFO, encr_info)) { if (alg_rsl == RSL_ALG_ID_A5_0) { /* For A5/0, encryption is not active. It is fine to omit the Encryption Information in this * case. Note that the first channel may see an RSL Encryption Command with A5/0 indicated, and * a subsequent handover may activate a new channel without any Encryption Information. */ setverdict(pass); return; } setverdict(fail, "Missing Encryption Information IE in ", rsl.msg_type); Misc_Helpers.f_shutdown(__BFILE__, __LINE__); return; } if (not match(encr_info, tr_EncrInfo(alg_rsl, expect_kc))) { setverdict(fail, "Unexpected Kc in Encryption Information IE in ", rsl.msg_type); Misc_Helpers.f_shutdown(__BFILE__, __LINE__); return; } setverdict(pass); } function f_cipher_mode(TestHdlrEncrParams enc, boolean exp_fail := false, RSL_DCHAN_PT rsl_pt := RSL, RSLEM_PROC_PT rsl_proc_pt := RSL_PROC) runs on MSC_ConnHdlr { var PDU_BSSAP bssap; var RSL_Message rsl; if (isvalue(enc.enc_kc128)) { BSSAP.send(ts_BSSMAP_CipherModeCmdKc128(enc.enc_alg_permitted, enc.enc_key, valueof(enc.enc_kc128))); } else { BSSAP.send(ts_BSSMAP_CipherModeCmd(enc.enc_alg_permitted, enc.enc_key)); } alt { /* RSL/UE Side */ [] rsl_pt.receive(tr_RSL_ENCR_CMD(g_chan_nr)) -> 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); f_verify_encr_info(rsl); if (ischosen(l3.msgs.rrm.cipheringModeCommand)) { f_rsl_reply(ts_RRM_CiphModeCompl, rsl, rsl_pt := rsl_pt); } repeat; } [] BSSAP.receive(tr_BSSMAP_CipherModeCompl) -> value bssap { if (exp_fail == true) { Misc_Helpers.f_shutdown(__BFILE__, __LINE__, fail, "Unexpected Cipher Mode Complete"); } else { setverdict(pass); var RSL_AlgId alg_rsl := f_cipher_mode_bssmap_to_rsl(g_pars.encr.enc_alg_expect); if (oct2int(bssap.pdu.bssmap.cipherModeComplete.chosenEncryptionAlgorithm.algorithmIdentifier) != enum2int(alg_rsl)) { setverdict(fail, "Unexpected Encryption Algorithm ID in BSSMAP Cipher Mode Complete"); } } } [] BSSAP.receive(tr_BSSMAP_CipherModeRej) -> value bssap { if (exp_fail == false) { Misc_Helpers.f_shutdown(__BFILE__, __LINE__, 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; var uint3_t tn := bit2int(ch_desc.timeslotNumber); select (inp) { case ('00001'B) { /* TCH/F */ chan_nr := valueof(t_RslChanNr_Bm(tn)); } case ('11101'B) { /* VAMOS TCH/F */ chan_nr := valueof(t_RslChanNr_Osmo_VAMOS_Bm(tn)); } case ('0001?'B) { /* TCH/H */ chan_nr := valueof(t_RslChanNr_Lm(tn, bit2int(substr(inp, 4, 1)))); } case ('1111?'B) { /* VAMOS TCH/H */ chan_nr := valueof(t_RslChanNr_Osmo_VAMOS_Lm(tn, bit2int(substr(inp, 4, 1)))); } case ('001??'B) { /* SDCCH/4 */ chan_nr := valueof(t_RslChanNr_SDCCH4(tn, bit2int(substr(inp, 3, 2)))); } case ('01???'B) { /* SDCCH/8 */ chan_nr := valueof(t_RslChanNr_SDCCH8(tn, bit2int(substr(inp, 2, 3)))); } case else { Misc_Helpers.f_shutdown(__BFILE__, __LINE__, fail, "Unknown ChDesc!"); } } if (ch_desc.octet3 and4b '10'O == '10'O) { Misc_Helpers.f_shutdown(__BFILE__, __LINE__, fail, "No support for Hopping"); } else { var OCT2 concat := ch_desc.octet3 & ch_desc.octet4; arfcn := oct2int(concat); } } type record AssignmentState { /* global */ boolean rtp_stream, boolean is_assignment, /* Assignment related bits */ boolean rr_ass_cmpl_seen, boolean old_lchan_deact_sacch_seen, boolean old_lchan_rll_rel_req_seen, boolean assignment_done, RslChannelNr old_chan_nr, /* Modify related bits */ PDU_ML3_NW_MS rr_channel_mode_modify_msg optional, boolean rr_modify_seen, RSL_Message rsl_mode_modify_msg optional, boolean modify_done } template (value) AssignmentState ts_AssignmentStateInit := { rtp_stream := false, is_assignment := false, rr_ass_cmpl_seen := false, old_lchan_deact_sacch_seen := false, old_lchan_rll_rel_req_seen := false, assignment_done := false, old_chan_nr := -, rr_channel_mode_modify_msg := omit, rr_modify_seen := false, rsl_mode_modify_msg := omit, modify_done := false } private template RSL_IE_Body tr_EncrInfo(template RSL_AlgId alg, template octetstring key) := { encr_info := { len := ?, alg_id := alg, key := key } } /* ensure the RSL CHAN ACT (during assignment) contains values we expect depending on test case */ private function f_check_chan_act(AssignmentState st, RSL_Message chan_act) runs on MSC_ConnHdlr { var RSL_IE_Body encr_info; var RSL_IE_Body ms_power_param; var RSL_IE_Body ms_power; if (ispresent(g_pars.encr) and g_pars.encr.enc_alg_permitted != '01'O) { if (not f_rsl_find_ie(chan_act, RSL_IE_ENCR_INFO, encr_info)) { Misc_Helpers.f_shutdown(__BFILE__, __LINE__, fail, "Missing Encryption IE in CHAN ACT"); } else { var RSL_AlgId alg := f_cipher_mode_bssmap_to_rsl(g_pars.encr.enc_alg_expect); var octetstring expect_key; if (alg == RSL_ALG_ID_A5_4) { expect_key := g_pars.encr.enc_kc128; } else { expect_key := g_pars.encr.enc_key; } if (not match(encr_info, tr_EncrInfo(alg, expect_key))) { Misc_Helpers.f_shutdown(__BFILE__, __LINE__, fail, "Unexpected Kc in Encryption IE in RSL ENCR CMD"); } } } else { if (f_rsl_find_ie(chan_act, RSL_IE_ENCR_INFO, encr_info)) { if (encr_info.encr_info.alg_id != RSL_ALG_ID_A5_0) { Misc_Helpers.f_shutdown(__BFILE__, __LINE__, fail, "Unexpected Encryption in CHAN ACT"); } } } /* FIXME: validate RSL_IE_ACT_TYPE, RSL_IE_CHAN_MODE, RSL_IE_CHAN_IDENT, RSL_IE_BS_POWER, * RSL_IE_TIMING_ADVANCE */ if (g_pars.exp_ms_power_params and not f_rsl_find_ie(chan_act, RSL_IE_MS_POWER_PARAM, ms_power_param)) { Misc_Helpers.f_shutdown(__BFILE__, __LINE__, fail, "IE MS Power Parameters not found in CHAN ACT"); } if (not f_rsl_find_ie(chan_act, RSL_IE_MS_POWER, ms_power)) { Misc_Helpers.f_shutdown(__BFILE__, __LINE__, fail, "IE MS Power not found in CHAN ACT"); } else { if (not match(ms_power.ms_power, tr_RSL_IE_MS_Power(g_pars.exp_ms_power_level, false))) { Misc_Helpers.f_shutdown(__BFILE__, __LINE__, fail, log2str("Wrong MS Power IE in CHAN ACT, ", ms_power.ms_power.power_level, " vs exp ", g_pars.exp_ms_power_level)); } } } function rr_chan_desc_tsc(ChannelDescription2_V cd2) return uint3_t { var uint3_t tsc := oct2int(cd2.octet3); tsc := tsc / 32; /* shl 5 */ return tsc; } altstep as_assignment(inout AssignmentState st, RSL_DCHAN_PT rsl_pt := RSL, RSLEM_PROC_PT rsl_proc_pt := RSL_PROC) runs on MSC_ConnHdlr { var RSL_Message rsl; [not st.rr_ass_cmpl_seen] rsl_pt.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; if (not istemplatekind(g_pars.expect_tsc, "omit")) { var uint3_t got_tsc := rr_chan_desc_tsc(l3.msgs.rrm.assignmentCommand.descrOf1stChAfterTime); if (not match(got_tsc, g_pars.expect_tsc)) { setverdict(fail, "RR Assignment: unexpected TSC in Channel Description: expected ", g_pars.expect_tsc, " got ", got_tsc); mtc.stop; } } 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, PT := rsl_proc_pt); /* dispatch queued messages for this channel (if any) */ f_rslem_dchan_queue_dispatch(PT := rsl_proc_pt); var PDU_ML3_MS_NW l3_tx := valueof(ts_RRM_AssignmentComplete('00'O)); /* send assignment complete over the new channel */ rsl_pt.send(ts_RSL_EST_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; /* obtain channel activation from RSL_Emulation for new channel */ var RSL_Message chan_act := f_rslem_get_last_act(rsl_proc_pt, 0, g_chan_nr); /* check it (e.g. for correct ciphering parameters) */ f_check_chan_act(st, chan_act); repeat; } else { Misc_Helpers.f_shutdown(__BFILE__, __LINE__, fail, log2str("Unexpected L3 received", l3)); } } [st.rr_ass_cmpl_seen] rsl_pt.receive(tr_RSL_DEACT_SACCH(st.old_chan_nr)) { st.old_lchan_deact_sacch_seen := true; repeat; } [st.rr_ass_cmpl_seen] rsl_pt.receive(tr_RSL_REL_REQ(st.old_chan_nr, tr_RslLinkID_DCCH(0))) { st.old_lchan_rll_rel_req_seen := true; rsl_pt.send(ts_RSL_REL_CONF(st.old_chan_nr, valueof(ts_RslLinkID_DCCH(0)))); repeat; } [st.rr_ass_cmpl_seen] rsl_pt.receive(tr_RSL_RF_CHAN_REL(st.old_chan_nr)) { rsl_pt.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, PT := rsl_proc_pt); 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.rtp_stream 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)) { st.rr_channel_mode_modify_msg := l3; f_rsl_reply(ts_RRM_ModeModifyAck(l3.msgs.rrm.channelModeModify.channelDescription, l3.msgs.rrm.channelModeModify.channelMode), rsl); st.rr_modify_seen := true; } repeat; } [st.rtp_stream and st.rr_modify_seen] RSL.receive(tr_RSL_MsgTypeD(RSL_MT_MODE_MODIFY_REQ)) -> value rsl { st.rsl_mode_modify_msg := 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; } /* Determine if the channel mode specified within rsl_chan_nr requires a * MODE MODIFY in to match the channel mode specified by given BSSMAP * ChannelType */ function f_channel_needs_modify(TELNETasp_PT vty, BSSMAP_IE_ChannelType bssmap, RslChannelNr rsl_chan_nr) return boolean { var boolean current_signalling := false; var boolean desired_signalling := false; select (rsl_chan_nr) { case (t_RslChanNr_SDCCH4(?, ?)) { current_signalling := true; } case (t_RslChanNr_SDCCH8(?, ?)) { current_signalling := true; } case (t_RslChanNr_Bm(?)) { /* TCH/F, always subslot 0 */ var charstring res := f_vty_transceive_ret(vty, "show lchan 0 0 " & int2str(rsl_chan_nr.tn) & " 0"); if (f_strstr(res, "Channel Mode / Codec: SIGNALLING", 0) >= 0) { current_signalling := true; } } case (t_RslChanNr_Lm(?, ?)) { /* TCH/H */ var charstring res := f_vty_transceive_ret(vty, "show lchan 0 0 " & int2str(rsl_chan_nr.tn) & " " & int2str(rsl_chan_nr.u.lm.sub_chan)); if (f_strstr(res, "Channel Mode / Codec: SIGNALLING", 0) >= 0) { current_signalling := true; } } } if (bssmap.speechOrDataIndicator == '0011'B) { desired_signalling := true; } if (current_signalling == desired_signalling) { /* The desired channel mode is equal to the one we currently * have, there is no mode modification needed or expected */ return false; } else { /* The desired channel mode and the current channel mode do * not match. A mode modification is required */ return true; } } /* patch an BSSMAP ASS REQ with LCLS related IEs, depending on g_params */ function f_ass_patch_lcls(inout template (omit) PDU_BSSAP ass_tpl, inout template PDU_BSSAP ass_cpl) runs on MSC_ConnHdlr { if (istemplatekind(ass_tpl, "omit")) { return; } if (ispresent(g_pars.lcls.gcr)) { ass_tpl.pdu.bssmap.assignmentRequest.globalCallReference := ts_BSSMAP_IE_GCR(g_pars.lcls.gcr); } if (ispresent(g_pars.lcls.cfg)) { ass_tpl.pdu.bssmap.assignmentRequest.lCLS_Configuration := ts_BSSMAP_IE_LclsCfg(g_pars.lcls.cfg); } if (ispresent(g_pars.lcls.csc)) { ass_tpl.pdu.bssmap.assignmentRequest.lCLS_ConnectionStatusControl := ts_BSSMAP_IE_LclsCsc(g_pars.lcls.csc); } if (ischosen(ass_cpl.pdu.bssmap.assignmentComplete)) { if (ispresent(g_pars.lcls.exp_sts)) { ass_cpl.pdu.bssmap.assignmentComplete.lCLS_BSS_Status := tr_BSSMAP_IE_LclsSts(g_pars.lcls.exp_sts); } else { ass_cpl.pdu.bssmap.assignmentComplete.lCLS_BSS_Status := omit; } } } /* Send a MGCP request through MGCP-over-IPA from MSC side and receive a (matching!) response */ function mgcp_transceive_mgw(template MgcpCommand cmd, template MgcpResponse resp := ?) runs on MSC_ConnHdlr { template MgcpResponse resp_any := ? var MgcpResponse resp_val; resp.line.trans_id := cmd.line.trans_id; timer T := 5.0; BSSAP.send(cmd); T.start; alt { [] as_Media_mgw(); [] BSSAP.receive(resp) -> value resp_val { } [] BSSAP.receive(resp_any) { setverdict(fail, "Response didn't match template"); mtc.stop; } [] BSSAP.receive { repeat; } [] T.timeout { setverdict(fail, "Timeout waiting for response to ", cmd); mtc.stop; } } T.stop; } /* Helper function to check if the activity on the MGCP matches what we * expected */ function f_check_mgcp_expectations() runs on MSC_ConnHdlr { for (var integer i:= 0; i < sizeof(g_media.mgcp_conn); i := i+1) { log(testcasename(), ": Check MGCP test expectations for g_media.mgcp_conn[", i , "]:", " crcx_seen=", g_media.mgcp_conn[i].crcx_seen, ", crcx_seen_exp=", g_media.mgcp_conn[i].crcx_seen_exp, ", mdcx_seen=", g_media.mgcp_conn[i].mdcx_seen, ", mdcx_seen_exp=", g_media.mgcp_conn[i].mdcx_seen_exp); if(g_media.mgcp_conn[i].crcx_seen != g_media.mgcp_conn[i].crcx_seen_exp) { Misc_Helpers.f_shutdown(__BFILE__, __LINE__, fail, "unexpected number of MGW-CRCX transactions on g_media.mgcp_conn[" & int2str(i) & "]"); } if(g_media.mgcp_conn[i].mdcx_seen != g_media.mgcp_conn[i].mdcx_seen_exp) { Misc_Helpers.f_shutdown(__BFILE__, __LINE__, fail, "unexpected number of MGW-MDCX transactions on g_media.mgcp_conn[" & int2str(i) & "]"); } } } /* establish a channel fully, expecting an assignment matching 'exp' */ function f_establish_fully(template (omit) PDU_BSSAP ass_tpl, template PDU_BSSAP exp_ass_cpl) runs on MSC_ConnHdlr { var BSSMAP_FIELD_CodecType codecType; timer T := 10.0; if (not istemplatekind(ass_tpl, "omit") and isvalue(ass_tpl.pdu.bssmap.assignmentRequest.codecList)) { codecType := valueof(ass_tpl.pdu.bssmap.assignmentRequest.codecList.codecElements[0].codecType); } else { /* Make sure a meaningful default is assigned in case the * codecList is not populated */ codecType := FR_AMR; } f_MscConnHdlr_init(g_pars.media_nr, host_bts, host_mgw_mgcp, codecType); /* patch in the LCLS related items, as needed */ f_ass_patch_lcls(ass_tpl, exp_ass_cpl); f_create_chan_and_exp(); /* start ciphering, if requested */ if (ispresent(g_pars.encr)) { f_cipher_mode(g_pars.encr); } /* bail out early if no assignment requested */ if (istemplatekind(ass_tpl, "omit")) { return; } var PDU_BSSAP ass_cmd := valueof(ass_tpl); var PDU_BSSAP bssap; var boolean exp_compl := ischosen(exp_ass_cpl.pdu.bssmap.assignmentComplete); var boolean exp_fail := ischosen(exp_ass_cpl.pdu.bssmap.assignmentFailure); var boolean exp_modify; 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 an rtp stream */ if (ass_cmd.pdu.bssmap.assignmentRequest.channelType.speechOrDataIndicator != '0011'B) { st.rtp_stream := true; exp_modify := 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; /* We decided to assign a new channel, so we do not expect * any mode modify messages on RSL */ exp_modify := false; } else { /* We will continue working with the currently assigned * channel, we must now check if the mode of the current * channel is compatible. If not we expect the BSC to modify * the mode */ st.is_assignment := false; exp_modify := f_channel_needs_modify(BSCVTY, ass_cmd.pdu.bssmap.assignmentRequest.channelType, g_chan_nr); } /* Some test situations will involve MGCP transactions on a media * gateway. Depending on the situation, we set up how many of each MGCP * message type are expected to be exchanged. */ if (isbound(exp_ass_cpl.pdu.bssmap.assignmentFailure)) { /* For tests that expect the assignment to fail, assume that * there will be no MGW communication as well. */ g_media.mgcp_conn[0].crcx_seen_exp := 0; g_media.mgcp_conn[0].mdcx_seen_exp := 0; g_media.mgcp_conn[1].crcx_seen_exp := 0; g_media.mgcp_conn[1].mdcx_seen_exp := 0; } else if (st.rtp_stream) { /* For RTP streams we expect the following MGCP activity */ g_media.mgcp_conn[0].crcx_seen_exp := 1; g_media.mgcp_conn[0].mdcx_seen_exp := 1; g_media.mgcp_conn[1].crcx_seen_exp := 1; g_media.mgcp_conn[1].mdcx_seen_exp := 0; } /* On receipt of the BSSAP Assignment Command, the IUT (osmo-bsc) will allocate * a channel and send us RR Assignment Command together with ip.access CRCX. * There is a risk that the RSL Emulation component would dequeue and process * ip.access CRCX faster than we process the Assignment Command and register * the corresponding handler for the indicated RSL channel number. This would * result in a failure, because at that moment there will be no handler for * ip.access CRCX. Let's guard against this and enable additional queueing. */ f_rslem_dchan_queue_enable(); 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 and exp_modify] as_modify(st); /* RTP stream related bits (IPA CRCX/MDCX + MGCP) */ [st.rtp_stream] 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 or not exp_modify))] 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 or not exp_modify))) and exp_compl] BSSAP.receive(tr_BSSMAP_AssignmentComplete) { Misc_Helpers.f_shutdown(__BFILE__, __LINE__, fail, "Received non-matching ASSIGNMENT COMPLETE"); } [exp_compl] BSSAP.receive(tr_BSSMAP_AssignmentFail) { Misc_Helpers.f_shutdown(__BFILE__, __LINE__, fail, "Received unexpected ASSIGNMENT FAIL"); } [not exp_compl] BSSAP.receive(tr_BSSMAP_AssignmentComplete) { Misc_Helpers.f_shutdown(__BFILE__, __LINE__, fail, "Received unexpected ASSIGNMENT COMPLETE"); } [not exp_compl] BSSAP.receive(tr_BSSMAP_AssignmentFail) { Misc_Helpers.f_shutdown(__BFILE__, __LINE__, fail, "Received non-matching ASSIGNMENT FAIL"); } [] T.timeout { Misc_Helpers.f_shutdown(__BFILE__, __LINE__, fail, "Timeout waiting for ASSIGNMENT COMPLETE"); } } log("g_media ", g_media); if (not isbound(bssap)) { mtc.stop; } if (exp_modify) { /* Verify that the RR Channel Mode Modify and RSL MODE MODIFY message asked for the expected channel * mode. */ /* TODO: more precisely expect the different types of speech? */ var OCT1 rr_channel_mode := st.rr_channel_mode_modify_msg.msgs.rrm.channelModeModify.channelMode.mode; if (st.rtp_stream and rr_channel_mode == '00'O) { setverdict(fail, "f_establish_fully(): Expected RR Channel Mode Modify", " to a speech mode, but got channelMode == ", rr_channel_mode); mtc.stop; } else if (not st.rtp_stream and rr_channel_mode != '00'O) { setverdict(fail, "f_establish_fully(): Expected RR Channel Mode Modify", " to signalling mode, but got channelMode == ", rr_channel_mode); mtc.stop; } var RSL_IE_Body chan_mode_ie; if (not f_rsl_find_ie(st.rsl_mode_modify_msg, RSL_IE_CHAN_MODE, chan_mode_ie)) { setverdict(fail, "RSL MODE MODIFY message lacks a Channel Mode IE"); mtc.stop; } var RSL_SpeechDataInd rsl_spd_ind := chan_mode_ie.chan_mode.spd_ind; if (st.rtp_stream and rsl_spd_ind != RSL_SPDI_SPEECH) { setverdict(fail, "f_establish_fully(): Expected RSL MODE MODIFY", " to a speech mode, but got spd_ind == ", rsl_spd_ind); mtc.stop; } else if (not st.rtp_stream and rsl_spd_ind != RSL_SPDI_SIGN) { setverdict(fail, "f_establish_fully(): Expected RSL MODE MODIFY", " to signalling mode, but got spd_ind == ", rsl_spd_ind); mtc.stop; } if (not istemplatekind(g_pars.expect_tsc, "omit")) { var uint3_t got_tsc := rr_chan_desc_tsc(st.rr_channel_mode_modify_msg.msgs.rrm.channelModeModify.channelDescription); if (not match(got_tsc, g_pars.expect_tsc)) { setverdict(fail, "RR Channel Mode Modify: unexpected TSC in Channel Description: expected ", g_pars.expect_tsc, " got ", got_tsc); mtc.stop; } } } else { /* not exp_modify, so this did a Channel Activate */ /* Check the TSC */ if (not istemplatekind(g_pars.expect_tsc, "omit")) { var RSL_Message chan_act := f_rslem_get_last_act(RSL_PROC, 0, g_chan_nr); var RSL_IE_Body ie; if (f_rsl_find_ie(chan_act, RSL_IE_CHAN_IDENT, ie)) { var uint3_t got_tsc := ie.chan_ident.ch_desc.v.tsc; if (not match(got_tsc, g_pars.expect_tsc)) { setverdict(fail, "RSL CHANnel ACTIVation: unexpected TSC in Channel Description: expected ", g_pars.expect_tsc, " got ", got_tsc); mtc.stop; } } } } /* When the BSC detects that LCLS is possible it will cross the * connetions that point to the PBX side of the MGW. In our case this * is mgcp_conn[1]. The BSC performs this operation already before the * assignment complete is generated. This means we expect another MDCX * at mgcp_conn[1] when LCLS is expected. */ if (g_pars.lcls.adjust_cx_exp and ispresent(exp_ass_cpl.pdu.bssmap.assignmentComplete.lCLS_BSS_Status.lCLS_BSS_StatusValue)) { if (valueof(exp_ass_cpl.pdu.bssmap.assignmentComplete.lCLS_BSS_Status.lCLS_BSS_StatusValue) == LCLS_STS_locally_switched) { g_media.mgcp_conn[1].mdcx_seen_exp := g_media.mgcp_conn[1].mdcx_seen_exp + 1; } } if (not exp_fail and st.rtp_stream and not g_pars.aoip) { /* With SCCPLite, connect to BSC-located MGW using a CRCX + SDP. It is sent in MGCP over IPA in the BSC<->MSC (BSC-NAT) connection. BSC will forward it to its MGW. */ var template MgcpCommand cmd; var template MgcpResponse resp; var integer cic := f_bssmap_ie_cic_2_int(ass_cmd.pdu.bssmap.assignmentRequest.circuitIdentityCode); var MgcpEndpoint ep := int2str(cic) & "@mgw"; /* matches value configured in BSC_Tests.ttcn pass in AssignReq */ var MgcpCallId call_id := '51234'H; var SDP_attribute_list attributes := { valueof(ts_SDP_ptime(20)) }; if (g_pars.use_osmux_cn) { cmd := ts_CRCX_osmux(get_next_trans_id(), ep, "sendrecv", call_id, cic); resp := tr_CRCX_ACK_osmux; } else { cmd := ts_CRCX(get_next_trans_id(), ep, "sendrecv", call_id); resp := tr_CRCX_ACK; } cmd.sdp := ts_SDP(host_msc, host_mgw_rtp_v4, "23", "42", 14000, { int2str(g_media.mgcp_conn[1].rtp_pt) }, { valueof(ts_SDP_ptime(20)) }); mgcp_transceive_mgw(cmd, resp); } f_check_mgcp_expectations(); if (st.is_assignment and st.assignment_done) { if (not st.old_lchan_deact_sacch_seen) { setverdict(fail, "f_establish_fully(): Assignment completed, but the old lchan was not", " released properly: expected a Deact SACCH on the old lchan, but saw none."); } if (st.old_lchan_rll_rel_req_seen) { setverdict(fail, "f_establish_fully(): Assignment completed, but the old lchan was not", " released properly: saw an RLL Release on the old lchan, but expecting none."); } } var charstring lchan_info := f_vty_transceive_ret(BSCVTY, "show lchan 0 0 " & int2str(g_chan_nr.tn) & " 0"); if (f_strstr(lchan_info, "State: ESTABLISHED") < 0) { log("after f_establish_fully(), 'show lchan' replied: ", lchan_info); setverdict(fail, "lchan is not in state ESTABLISHED"); mtc.stop; } } type record HandoverState { /* Assignment related bits */ boolean rr_ho_cmpl_seen, integer mdcx_seen_before_ho, boolean handover_done, RslChannelNr old_chan_nr, uint3_t expect_target_tsc optional }; 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! */ /* Verify correct TSC in handoverCommand */ if (ispresent(st.expect_target_tsc)) { var uint3_t got_tsc := rr_chan_desc_tsc(l3.msgs.rrm.handoverCommand.channelDescription2); if (not match(got_tsc, st.expect_target_tsc)) { setverdict(fail, "RR Handover Command: unexpected TSC in Channel Description: expected ", st.expect_target_tsc, " got ", got_tsc); mtc.stop; } else { log("handoverCommand: verified TSC = ", got_tsc, " (matches ", st.expect_target_tsc, ")"); } } /* 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 detect */ RSL1.send(ts_RSL_HANDO_DET(new_chan_nr)); f_sleep(0.3); /* send handover complete over the new channel */ var PDU_ML3_MS_NW l3_tx := valueof(ts_RRM_HandoverComplete('00'O)); RSL1.send(ts_RSL_EST_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; /* Memorize how many MDCX we have seen before. We need this number to detect * that we have received the handover related MDCX */ st.mdcx_seen_before_ho := g_media.mgcp_conn[0].mdcx_seen; repeat; } else { Misc_Helpers.f_shutdown(__BFILE__, __LINE__, fail, log2str("Unexpected L3 received", l3)); } } [st.rr_ho_cmpl_seen] as_Media_ipacc(); [st.rr_ho_cmpl_seen] as_Media_mgw(); [st.rr_ho_cmpl_seen] RSL.receive(tr_RSL_DEACT_SACCH(st.old_chan_nr)) { repeat; } [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); /* The channel release must not necessarly be synchronized to the RSL handover * procedure since those events may happen independently nearly at the same * time. When we receive the RSL_RF_CHAN_REL command the media negotiation on * IPACC or MGCP level may be still in progress. In order to make sure that * we do only stop when we have seen an MDCX on MGCP level and another a CRCX * as well as an MDCX on IPACC level. * If ipa_crcx_seen is false, this is not a voice channel and we need not check MGCP at all.. */ if (g_media.bts.ipa_crcx_seen and (g_media.mgcp_conn[0].mdcx_seen <= st.mdcx_seen_before_ho or g_media.bts1.ipa_mdcx_seen == false or g_media.bts1.ipa_crcx_seen == false)) { repeat; } else { st.handover_done := true; } } } }