fix _gsm48_cc_trans_free(): send MNCC REL.ind on Clear Request
Calling gsm48_cc_tx_release() before mncc_release_ind() has a side effect: the former may change CC state to GSM_CSTATE_RELEASE_REQ. This makes the later send MNCC_REL_CNF instead of MNCC_REL_IND, so if one of the call leg disconnects due to RF failure, the other one will not be terminated correctly. Makes both TC_{mo,mt}_call_clear_request TTCN-3 test cases pass. Change-Id: I3ad4a99757878de3796027325627c87d9a4e93f1 Related: Id16969fe0de04445d1320a96d35cf1d48cc8cf09 Related: SYS#5340
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@ -272,6 +272,13 @@ void _gsm48_cc_trans_free(struct gsm_trans *trans)
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/* send release to L4, if callref still exists */
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/* send release to L4, if callref still exists */
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if (trans->callref) {
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if (trans->callref) {
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/* Send MNCC REL.ind (cause='Resource unavailable') */
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if (trans->cc.mncc_initiated) {
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mncc_release_ind(trans->net, trans, trans->callref,
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GSM48_CAUSE_LOC_PRN_S_LU,
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GSM48_CC_CAUSE_RESOURCE_UNAVAIL);
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}
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/* FIXME: currently, a CC trans that would not yet be in state GSM_CSTATE_RELEASE_REQ fails to send a
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/* FIXME: currently, a CC trans that would not yet be in state GSM_CSTATE_RELEASE_REQ fails to send a
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* CC Release to the MS if it gets freed here. Hack it to do so. */
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* CC Release to the MS if it gets freed here. Hack it to do so. */
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if (trans->cc.state != GSM_CSTATE_RELEASE_REQ) {
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if (trans->cc.state != GSM_CSTATE_RELEASE_REQ) {
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@ -280,11 +287,6 @@ void _gsm48_cc_trans_free(struct gsm_trans *trans)
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mncc_set_cause(&rel, GSM48_CAUSE_LOC_PRN_S_LU, GSM48_CC_CAUSE_RESOURCE_UNAVAIL);
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mncc_set_cause(&rel, GSM48_CAUSE_LOC_PRN_S_LU, GSM48_CC_CAUSE_RESOURCE_UNAVAIL);
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gsm48_cc_tx_release(trans, &rel);
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gsm48_cc_tx_release(trans, &rel);
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}
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}
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/* Resource unavailable */
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if (trans->cc.mncc_initiated)
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mncc_release_ind(trans->net, trans, trans->callref,
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GSM48_CAUSE_LOC_PRN_S_LU,
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GSM48_CC_CAUSE_RESOURCE_UNAVAIL);
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/* This is a final freeing of the transaction. The MNCC release may have triggered the
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/* This is a final freeing of the transaction. The MNCC release may have triggered the
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* T308 release timer, but we don't have the luxury of graceful CC Release here. */
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* T308 release timer, but we don't have the luxury of graceful CC Release here. */
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gsm48_stop_cc_timer(trans);
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gsm48_stop_cc_timer(trans);
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@ -457,11 +457,7 @@ static void test_call_mt2()
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fake_time_passes(15, 23);
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fake_time_passes(15, 23);
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btw("The call failed, the BSC sends a BSSMAP Clear Request");
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btw("The call failed, the BSC sends a BSSMAP Clear Request");
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/* FIXME: in this scenario, we send an MNCC_REL_CNF even though MNCC never asked us to MNCC_REL_REQ. Legacy
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cc_to_mncc_expect_tx("", MNCC_REL_IND);
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* behavior did get to both MNCC_REL_IND, then an MNCC_REL_REQ from MNCC as well as a final MNCC_REL_CNF, but
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* this only worked synchronously, i.e. only with internal MNCC. Instead of mimicking that, we need a proper
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* async solution that also works with a PBX. */
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cc_to_mncc_expect_tx("", MNCC_REL_CNF);
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dtap_expect_tx("032d0802e1af"); /* CC: Release */
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dtap_expect_tx("032d0802e1af"); /* CC: Release */
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expect_iu_release();
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expect_iu_release();
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msc_a_release_cn(msub_msc_a(g_msub));
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msc_a_release_cn(msub_msc_a(g_msub));
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@ -1302,6 +1302,8 @@ DREF VLR subscr IMSI-901700000010650:MSISDN-42342:TMSI-0x03020100 + vlr_subscr_c
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DREF VLR subscr IMSI-901700000010650:MSISDN-42342:TMSI-0x03020100 - vlr_subscr_cancel_attach_fsm: now used by 4 (attached,CC,active-conn,msc_a_fsm_releasing_onenter)
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DREF VLR subscr IMSI-901700000010650:MSISDN-42342:TMSI-0x03020100 - vlr_subscr_cancel_attach_fsm: now used by 4 (attached,CC,active-conn,msc_a_fsm_releasing_onenter)
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DCC trans(CC:CALL_RECEIVED IMSI-901700000010650:MSISDN-42342:TMSI-0x03020100:UTRAN-Iu:PAGING_RESP callref-0x423 tid-0) Freeing transaction
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DCC trans(CC:CALL_RECEIVED IMSI-901700000010650:MSISDN-42342:TMSI-0x03020100:UTRAN-Iu:PAGING_RESP callref-0x423 tid-0) Freeing transaction
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DCC trans(CC:CALL_RECEIVED IMSI-901700000010650:MSISDN-42342:TMSI-0x03020100:UTRAN-Iu:PAGING_RESP callref-0x423 tid-0) stopping pending timer T301
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DCC trans(CC:CALL_RECEIVED IMSI-901700000010650:MSISDN-42342:TMSI-0x03020100:UTRAN-Iu:PAGING_RESP callref-0x423 tid-0) stopping pending timer T301
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DMNCC trans(CC:CALL_RECEIVED IMSI-901700000010650:MSISDN-42342:TMSI-0x03020100:UTRAN-Iu:PAGING_RESP callref-0x423 tid-0) tx MNCC_REL_IND
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MSC --> MNCC: callref 0x423: MNCC_REL_IND
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DCC trans(CC:CALL_RECEIVED IMSI-901700000010650:MSISDN-42342:TMSI-0x03020100:UTRAN-Iu:PAGING_RESP callref-0x423 tid-0) starting timer T308 with 10 seconds
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DCC trans(CC:CALL_RECEIVED IMSI-901700000010650:MSISDN-42342:TMSI-0x03020100:UTRAN-Iu:PAGING_RESP callref-0x423 tid-0) starting timer T308 with 10 seconds
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DCC trans(CC:CALL_RECEIVED IMSI-901700000010650:MSISDN-42342:TMSI-0x03020100:UTRAN-Iu:PAGING_RESP callref-0x423 tid-0) new state CALL_RECEIVED -> RELEASE_REQ
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DCC trans(CC:CALL_RECEIVED IMSI-901700000010650:MSISDN-42342:TMSI-0x03020100:UTRAN-Iu:PAGING_RESP callref-0x423 tid-0) new state CALL_RECEIVED -> RELEASE_REQ
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DIUCS msc_a(IMSI-901700000010650:MSISDN-42342:TMSI-0x03020100:UTRAN-Iu:PAGING_RESP){MSC_A_ST_RELEASING}: Sending DTAP: CC GSM48_MT_CC_RELEASE
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DIUCS msc_a(IMSI-901700000010650:MSISDN-42342:TMSI-0x03020100:UTRAN-Iu:PAGING_RESP){MSC_A_ST_RELEASING}: Sending DTAP: CC GSM48_MT_CC_RELEASE
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@ -1309,8 +1311,6 @@ DMSC msc_a(IMSI-901700000010650:MSISDN-42342:TMSI-0x03020100:UTRAN-Iu:PAGING_RES
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- DTAP --UTRAN-Iu--> MS: GSM48_MT_CC_RELEASE: 032d0802e1af
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- DTAP --UTRAN-Iu--> MS: GSM48_MT_CC_RELEASE: 032d0802e1af
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- DTAP matches expected message
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- DTAP matches expected message
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DMSC dummy_msc_i(IMSI-901700000010650:MSISDN-42342:TMSI-0x03020100:UTRAN-Iu:PAGING_RESP){0}: Received Event MSC_I_EV_FROM_A_FORWARD_ACCESS_SIGNALLING_REQUEST
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DMSC dummy_msc_i(IMSI-901700000010650:MSISDN-42342:TMSI-0x03020100:UTRAN-Iu:PAGING_RESP){0}: Received Event MSC_I_EV_FROM_A_FORWARD_ACCESS_SIGNALLING_REQUEST
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DMNCC trans(CC:RELEASE_REQ IMSI-901700000010650:MSISDN-42342:TMSI-0x03020100:UTRAN-Iu:PAGING_RESP callref-0x423 tid-0) tx MNCC_REL_CNF
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MSC --> MNCC: callref 0x423: MNCC_REL_CNF
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DCC trans(CC:RELEASE_REQ IMSI-901700000010650:MSISDN-42342:TMSI-0x03020100:UTRAN-Iu:PAGING_RESP callref-0x423 tid-0) stopping pending timer T308
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DCC trans(CC:RELEASE_REQ IMSI-901700000010650:MSISDN-42342:TMSI-0x03020100:UTRAN-Iu:PAGING_RESP callref-0x423 tid-0) stopping pending timer T308
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DCC trans(CC:RELEASE_REQ IMSI-901700000010650:MSISDN-42342:TMSI-0x03020100:UTRAN-Iu:PAGING_RESP callref-0x423 tid-0) new state RELEASE_REQ -> NULL
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DCC trans(CC:RELEASE_REQ IMSI-901700000010650:MSISDN-42342:TMSI-0x03020100:UTRAN-Iu:PAGING_RESP callref-0x423 tid-0) new state RELEASE_REQ -> NULL
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DREF VLR subscr IMSI-901700000010650:MSISDN-42342:TMSI-0x03020100 - CC: now used by 3 (attached,active-conn,msc_a_fsm_releasing_onenter)
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DREF VLR subscr IMSI-901700000010650:MSISDN-42342:TMSI-0x03020100 - CC: now used by 3 (attached,active-conn,msc_a_fsm_releasing_onenter)
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