| /* (C) 2008-2009 by Harald Welte <laforge@gnumonks.org> |
| * (C) 2009 by Andreas Eversberg <Andreas.Eversberg@versatel.de> |
| * All Rights Reserved |
| * |
| * This program is free software; you can redistribute it and/or modify |
| * it under the terms of the GNU General Public License as published by |
| * the Free Software Foundation; either version 2 of the License, or |
| * (at your option) any later version. |
| * |
| * This program is distributed in the hope that it will be useful, |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| * GNU General Public License for more details. |
| * |
| * You should have received a copy of the GNU General Public License along |
| * with this program; if not, write to the Free Software Foundation, Inc., |
| * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. |
| * |
| */ |
| |
| |
| #include <stdio.h> |
| #include <stdlib.h> |
| #include <string.h> |
| #include <sys/types.h> |
| |
| #include <openbsc/gsm_04_08.h> |
| #include <openbsc/debug.h> |
| #include <openbsc/mncc.h> |
| |
| static struct mncc_names { |
| char *name; |
| int value; |
| } mncc_names[] = { |
| {"MNCC_SETUP_REQ", 0x0101}, |
| {"MNCC_SETUP_IND", 0x0102}, |
| {"MNCC_SETUP_RSP", 0x0103}, |
| {"MNCC_SETUP_CNF", 0x0104}, |
| {"MNCC_SETUP_COMPL_REQ",0x0105}, |
| {"MNCC_SETUP_COMPL_IND",0x0106}, |
| {"MNCC_CALL_CONF_IND", 0x0107}, |
| {"MNCC_CALL_PROC_REQ", 0x0108}, |
| {"MNCC_PROGRESS_REQ", 0x0109}, |
| {"MNCC_ALERT_REQ", 0x010a}, |
| {"MNCC_ALERT_IND", 0x010b}, |
| {"MNCC_NOTIFY_REQ", 0x010c}, |
| {"MNCC_NOTIFY_IND", 0x010d}, |
| {"MNCC_DISC_REQ", 0x010e}, |
| {"MNCC_DISC_IND", 0x010f}, |
| {"MNCC_REL_REQ", 0x0110}, |
| {"MNCC_REL_IND", 0x0111}, |
| {"MNCC_REL_CNF", 0x0112}, |
| {"MNCC_FACILITY_REQ", 0x0113}, |
| {"MNCC_FACILITY_IND", 0x0114}, |
| {"MNCC_START_DTMF_IND", 0x0115}, |
| {"MNCC_START_DTMF_RSP", 0x0116}, |
| {"MNCC_START_DTMF_REJ", 0x0117}, |
| {"MNCC_STOP_DTMF_IND", 0x0118}, |
| {"MNCC_STOP_DTMF_RSP", 0x0119}, |
| {"MNCC_MODIFY_REQ", 0x011a}, |
| {"MNCC_MODIFY_IND", 0x011b}, |
| {"MNCC_MODIFY_RSP", 0x011c}, |
| {"MNCC_MODIFY_CNF", 0x011d}, |
| {"MNCC_MODIFY_REJ", 0x011e}, |
| {"MNCC_HOLD_IND", 0x011f}, |
| {"MNCC_HOLD_CNF", 0x0120}, |
| {"MNCC_HOLD_REJ", 0x0121}, |
| {"MNCC_RETRIEVE_IND", 0x0122}, |
| {"MNCC_RETRIEVE_CNF", 0x0123}, |
| {"MNCC_RETRIEVE_REJ", 0x0124}, |
| {"MNCC_USERINFO_REQ", 0x0125}, |
| {"MNCC_USERINFO_IND", 0x0126}, |
| {"MNCC_REJ_REQ", 0x0127}, |
| {"MNCC_REJ_IND", 0x0128}, |
| |
| {"MNCC_BRIDGE", 0x0200}, |
| {"MNCC_FRAME_RECV", 0x0201}, |
| {"MNCC_FRAME_DROP", 0x0202}, |
| {"MNCC_LCHAN_MODIFY", 0x0203}, |
| |
| {"GSM_TRAU_FRAME", 0x0300}, |
| |
| {NULL, 0} |
| }; |
| |
| static LLIST_HEAD(call_list); |
| |
| static u_int32_t new_callref = 0x00000001; |
| |
| char *get_mncc_name(int value) |
| { |
| int i; |
| |
| for (i = 0; mncc_names[i].name; i++) { |
| if (mncc_names[i].value == value) |
| return mncc_names[i].name; |
| } |
| |
| return "MNCC_Unknown"; |
| } |
| |
| static void free_call(struct gsm_call *call) |
| { |
| llist_del(&call->entry); |
| DEBUGP(DMNCC, "(call %x) Call removed.\n", call->callref); |
| free(call); |
| } |
| |
| |
| 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; |
| |
| /* already have remote call */ |
| if (call->remote_ref) |
| return 0; |
| |
| /* create remote call */ |
| if (!(remote = calloc(1, sizeof(struct gsm_call)))) { |
| memset(&mncc, 0, sizeof(struct gsm_mncc)); |
| mncc.callref = call->callref; |
| mncc_set_cause(&mncc, GSM48_CAUSE_LOC_PRN_S_LU, |
| GSM48_CC_CAUSE_RESOURCE_UNAVAIL); |
| mncc_send(call->net, MNCC_REJ_REQ, &mncc); |
| free_call(call); |
| return 0; |
| } |
| 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); |
| } |
| |
| 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; |
| 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); |
| return mncc_send(call->net, MNCC_BRIDGE, refs); |
| } |
| |
| 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; |
| } |
| |
| 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 = calloc(1, sizeof(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); |
| } |
| |
| DEBUGP(DMNCC, "(call %x) Received message %s\n", call->callref, |
| get_mncc_name(msg_type)); |
| |
| 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; |
| default: |
| DEBUGP(DMNCC, "(call %x) Message unhandled\n", callref); |
| break; |
| } |
| |
| return rc; |
| } |