diff options
author | Harald Welte <laforge@gnumonks.org> | 2010-12-22 23:54:51 +0100 |
---|---|---|
committer | Harald Welte <laforge@gnumonks.org> | 2011-01-01 17:23:41 +0100 |
commit | 3e6376d20d730a515849067a41b01359a8bae051 (patch) | |
tree | 6a774cbef093b2cd95001d654f8b04f1af22c4a0 /openbsc/src/mncc.c | |
parent | 081e14d071ab2dde97a7cf5bf11f1b037541660f (diff) |
MNCC: split into generic mncc.c and mncc_builtin.c
The built-in code to handle call switching inside OpenBSC is
now in mncc_builtin.c, whereas some core/utility functions remain
in mncc.c
Diffstat (limited to 'openbsc/src/mncc.c')
-rw-r--r-- | openbsc/src/mncc.c | 366 |
1 files changed, 2 insertions, 364 deletions
diff --git a/openbsc/src/mncc.c b/openbsc/src/mncc.c index 3d16d8f99..1c5e21ce5 100644 --- a/openbsc/src/mncc.c +++ b/openbsc/src/mncc.c @@ -1,5 +1,5 @@ -/* mncc.c - default, minimal built-in MNCC Application for - * standalone bsc_hack (netowrk-in-the-box mode) */ +/* mncc.c - utility routines for the MNCC API between the 04.08 + * message parsing and the actual Call Control logic */ /* (C) 2008-2009 by Harald Welte <laforge@gnumonks.org> * (C) 2009 by Andreas Eversberg <Andreas.Eversberg@versatel.de> @@ -35,8 +35,6 @@ #include <openbsc/transaction.h> #include <openbsc/rtp_proxy.h> -void *tall_call_ctx; - static struct mncc_names { char *name; int value; @@ -91,10 +89,6 @@ static struct mncc_names { {NULL, 0} }; -static LLIST_HEAD(call_list); - -static u_int32_t new_callref = 0x00000001; - char *get_mncc_name(int value) { int i; @@ -107,365 +101,9 @@ char *get_mncc_name(int value) return "MNCC_Unknown"; } -static void free_call(struct gsm_call *call) -{ - llist_del(&call->entry); - DEBUGP(DMNCC, "(call %x) Call removed.\n", call->callref); - talloc_free(call); -} - - -static struct gsm_call *get_call_ref(u_int32_t callref) -{ - struct gsm_call *callt; - - llist_for_each_entry(callt, &call_list, entry) { - if (callt->callref == callref) - return callt; - } - return NULL; -} - void mncc_set_cause(struct gsm_mncc *data, int loc, int val) { data->fields |= MNCC_F_CAUSE; data->cause.location = loc; data->cause.value = val; } - -/* on incoming call, look up database and send setup to remote subscr. */ -static int mncc_setup_ind(struct gsm_call *call, int msg_type, - struct gsm_mncc *setup) -{ - struct gsm_mncc mncc; - struct gsm_call *remote; - - memset(&mncc, 0, sizeof(struct gsm_mncc)); - mncc.callref = call->callref; - - /* already have remote call */ - if (call->remote_ref) - return 0; - - /* transfer mode 1 would be packet mode, which was never specified */ - if (setup->bearer_cap.mode != 0) { - LOGP(DMNCC, LOGL_NOTICE, "(call %x) We don't support " - "packet mode\n", call->callref); - mncc_set_cause(&mncc, GSM48_CAUSE_LOC_PRN_S_LU, - GSM48_CC_CAUSE_BEARER_CA_UNAVAIL); - goto out_reject; - } - - /* we currently only do speech */ - if (setup->bearer_cap.transfer != GSM_MNCC_BCAP_SPEECH) { - LOGP(DMNCC, LOGL_NOTICE, "(call %x) We only support " - "voice calls\n", call->callref); - mncc_set_cause(&mncc, GSM48_CAUSE_LOC_PRN_S_LU, - GSM48_CC_CAUSE_BEARER_CA_UNAVAIL); - goto out_reject; - } - - /* create remote call */ - if (!(remote = talloc(tall_call_ctx, struct gsm_call))) { - mncc_set_cause(&mncc, GSM48_CAUSE_LOC_PRN_S_LU, - GSM48_CC_CAUSE_RESOURCE_UNAVAIL); - goto out_reject; - } - llist_add_tail(&remote->entry, &call_list); - remote->net = call->net; - remote->callref = new_callref++; - DEBUGP(DMNCC, "(call %x) Creating new remote instance %x.\n", - call->callref, remote->callref); - - /* link remote call */ - call->remote_ref = remote->callref; - remote->remote_ref = call->callref; - - /* modify mode */ - memset(&mncc, 0, sizeof(struct gsm_mncc)); - mncc.callref = call->callref; - mncc.lchan_mode = GSM48_CMODE_SPEECH_EFR; - DEBUGP(DMNCC, "(call %x) Modify channel mode.\n", call->callref); - mncc_send(call->net, MNCC_LCHAN_MODIFY, &mncc); - - /* send call proceeding */ - memset(&mncc, 0, sizeof(struct gsm_mncc)); - mncc.callref = call->callref; - DEBUGP(DMNCC, "(call %x) Accepting call.\n", call->callref); - mncc_send(call->net, MNCC_CALL_PROC_REQ, &mncc); - - /* send setup to remote */ -// setup->fields |= MNCC_F_SIGNAL; -// setup->signal = GSM48_SIGNAL_DIALTONE; - setup->callref = remote->callref; - DEBUGP(DMNCC, "(call %x) Forwarding SETUP to remote.\n", call->callref); - return mncc_send(remote->net, MNCC_SETUP_REQ, setup); - -out_reject: - mncc_send(call->net, MNCC_REJ_REQ, &mncc); - free_call(call); - return 0; -} - -static int mncc_alert_ind(struct gsm_call *call, int msg_type, - struct gsm_mncc *alert) -{ - struct gsm_call *remote; - - /* send alerting to remote */ - if (!(remote = get_call_ref(call->remote_ref))) - return 0; - alert->callref = remote->callref; - DEBUGP(DMNCC, "(call %x) Forwarding ALERT to remote.\n", call->callref); - return mncc_send(remote->net, MNCC_ALERT_REQ, alert); -} - -static int mncc_notify_ind(struct gsm_call *call, int msg_type, - struct gsm_mncc *notify) -{ - struct gsm_call *remote; - - /* send notify to remote */ - if (!(remote = get_call_ref(call->remote_ref))) - return 0; - notify->callref = remote->callref; - DEBUGP(DMNCC, "(call %x) Forwarding NOTIF to remote.\n", call->callref); - return mncc_send(remote->net, MNCC_NOTIFY_REQ, notify); -} - -static int mncc_setup_cnf(struct gsm_call *call, int msg_type, - struct gsm_mncc *connect) -{ - struct gsm_mncc connect_ack, frame_recv; - struct gsm_network *net = call->net; - struct gsm_call *remote; - u_int32_t refs[2]; - - /* acknowledge connect */ - memset(&connect_ack, 0, sizeof(struct gsm_mncc)); - connect_ack.callref = call->callref; - DEBUGP(DMNCC, "(call %x) Acknowledge SETUP.\n", call->callref); - mncc_send(call->net, MNCC_SETUP_COMPL_REQ, &connect_ack); - - /* send connect message to remote */ - if (!(remote = get_call_ref(call->remote_ref))) - return 0; - connect->callref = remote->callref; - DEBUGP(DMNCC, "(call %x) Sending CONNECT to remote.\n", call->callref); - mncc_send(remote->net, MNCC_SETUP_RSP, connect); - - /* bridge tch */ - refs[0] = call->callref; - refs[1] = call->remote_ref; - DEBUGP(DMNCC, "(call %x) Bridging with remote.\n", call->callref); - - /* in direct mode, we always have to bridge the channels */ - if (ipacc_rtp_direct) - return mncc_send(call->net, MNCC_BRIDGE, refs); - - /* proxy mode */ - if (!net->handover.active) { - /* in the no-handover case, we can bridge, i.e. use - * the old RTP proxy code */ - return mncc_send(call->net, MNCC_BRIDGE, refs); - } else { - /* in case of handover, we need to re-write the RTP - * SSRC, sequence and timestamp values and thus - * need to enable RTP receive for both directions */ - memset(&frame_recv, 0, sizeof(struct gsm_mncc)); - frame_recv.callref = call->callref; - mncc_send(call->net, MNCC_FRAME_RECV, &frame_recv); - frame_recv.callref = call->remote_ref; - return mncc_send(call->net, MNCC_FRAME_RECV, &frame_recv); - } -} - -static int mncc_disc_ind(struct gsm_call *call, int msg_type, - struct gsm_mncc *disc) -{ - struct gsm_call *remote; - - /* send release */ - DEBUGP(DMNCC, "(call %x) Releasing call with cause %d\n", - call->callref, disc->cause.value); - mncc_send(call->net, MNCC_REL_REQ, disc); - - /* send disc to remote */ - if (!(remote = get_call_ref(call->remote_ref))) { - return 0; - } - disc->callref = remote->callref; - DEBUGP(DMNCC, "(call %x) Disconnecting remote with cause %d\n", - remote->callref, disc->cause.value); - return mncc_send(remote->net, MNCC_DISC_REQ, disc); -} - -static int mncc_rel_ind(struct gsm_call *call, int msg_type, struct gsm_mncc *rel) -{ - struct gsm_call *remote; - - /* send release to remote */ - if (!(remote = get_call_ref(call->remote_ref))) { - free_call(call); - return 0; - } - rel->callref = remote->callref; - DEBUGP(DMNCC, "(call %x) Releasing remote with cause %d\n", - call->callref, rel->cause.value); - mncc_send(remote->net, MNCC_REL_REQ, rel); - - free_call(call); - - return 0; -} - -static int mncc_rel_cnf(struct gsm_call *call, int msg_type, struct gsm_mncc *rel) -{ - free_call(call); - return 0; -} - -/* receiving a TCH/F frame from the BSC code */ -static int mncc_rcv_tchf(struct gsm_call *call, int msg_type, - struct gsm_data_frame *dfr) -{ - struct gsm_trans *remote_trans; - - remote_trans = trans_find_by_callref(call->net, call->remote_ref); - - /* this shouldn't really happen */ - if (!remote_trans || !remote_trans->conn) { - LOGP(DMNCC, LOGL_ERROR, "No transaction or transaction without lchan?!?\n"); - return -EIO; - } - - /* RTP socket of remote end has meanwhile died */ - if (!remote_trans->conn->lchan->abis_ip.rtp_socket) - return -EIO; - - return rtp_send_frame(remote_trans->conn->lchan->abis_ip.rtp_socket, dfr); -} - - -/* Internal MNCC handler input function (from CC -> MNCC -> here) */ -int int_mncc_recv(struct gsm_network *net, int msg_type, void *arg) -{ - struct gsm_mncc *data = arg; - int callref; - struct gsm_call *call = NULL, *callt; - int rc = 0; - - /* Special messages */ - switch(msg_type) { - } - - /* find callref */ - callref = data->callref; - llist_for_each_entry(callt, &call_list, entry) { - if (callt->callref == callref) { - call = callt; - break; - } - } - - /* create callref, if setup is received */ - if (!call) { - if (msg_type != MNCC_SETUP_IND) - return 0; /* drop */ - /* create call */ - if (!(call = talloc_zero(tall_call_ctx, struct gsm_call))) { - struct gsm_mncc rel; - - memset(&rel, 0, sizeof(struct gsm_mncc)); - rel.callref = callref; - mncc_set_cause(&rel, GSM48_CAUSE_LOC_PRN_S_LU, - GSM48_CC_CAUSE_RESOURCE_UNAVAIL); - mncc_send(net, MNCC_REL_REQ, &rel); - return 0; - } - llist_add_tail(&call->entry, &call_list); - call->net = net; - call->callref = callref; - DEBUGP(DMNCC, "(call %x) Call created.\n", call->callref); - } - - switch (msg_type) { - case GSM_TCHF_FRAME: - case GSM_TCHF_FRAME_EFR: - break; - default: - DEBUGP(DMNCC, "(call %x) Received message %s\n", call->callref, - get_mncc_name(msg_type)); - break; - } - - switch(msg_type) { - case MNCC_SETUP_IND: - rc = mncc_setup_ind(call, msg_type, arg); - break; - case MNCC_SETUP_CNF: - rc = mncc_setup_cnf(call, msg_type, arg); - break; - case MNCC_SETUP_COMPL_IND: - break; - case MNCC_CALL_CONF_IND: - /* we now need to MODIFY the channel */ - data->lchan_mode = GSM48_CMODE_SPEECH_EFR; - mncc_send(call->net, MNCC_LCHAN_MODIFY, data); - break; - case MNCC_ALERT_IND: - rc = mncc_alert_ind(call, msg_type, arg); - break; - case MNCC_NOTIFY_IND: - rc = mncc_notify_ind(call, msg_type, arg); - break; - case MNCC_DISC_IND: - rc = mncc_disc_ind(call, msg_type, arg); - break; - case MNCC_REL_IND: - case MNCC_REJ_IND: - rc = mncc_rel_ind(call, msg_type, arg); - break; - case MNCC_REL_CNF: - rc = mncc_rel_cnf(call, msg_type, arg); - break; - case MNCC_FACILITY_IND: - break; - case MNCC_START_DTMF_IND: - break; - case MNCC_STOP_DTMF_IND: - break; - case MNCC_MODIFY_IND: - mncc_set_cause(data, GSM48_CAUSE_LOC_PRN_S_LU, - GSM48_CC_CAUSE_SERV_OPT_UNIMPL); - DEBUGP(DMNCC, "(call %x) Rejecting MODIFY with cause %d\n", - call->callref, data->cause.value); - rc = mncc_send(net, MNCC_MODIFY_REJ, data); - break; - case MNCC_MODIFY_CNF: - break; - case MNCC_HOLD_IND: - mncc_set_cause(data, GSM48_CAUSE_LOC_PRN_S_LU, - GSM48_CC_CAUSE_SERV_OPT_UNIMPL); - DEBUGP(DMNCC, "(call %x) Rejecting HOLD with cause %d\n", - call->callref, data->cause.value); - rc = mncc_send(net, MNCC_HOLD_REJ, data); - break; - case MNCC_RETRIEVE_IND: - mncc_set_cause(data, GSM48_CAUSE_LOC_PRN_S_LU, - GSM48_CC_CAUSE_SERV_OPT_UNIMPL); - DEBUGP(DMNCC, "(call %x) Rejecting RETRIEVE with cause %d\n", - call->callref, data->cause.value); - rc = mncc_send(net, MNCC_RETRIEVE_REJ, data); - break; - case GSM_TCHF_FRAME: - case GSM_TCHF_FRAME_EFR: - rc = mncc_rcv_tchf(call, msg_type, arg); - break; - default: - LOGP(DMNCC, LOGL_NOTICE, "(call %x) Message unhandled\n", callref); - break; - } - - return rc; -} |