1152 lines
31 KiB
C
1152 lines
31 KiB
C
/**
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* This file contains helper routines for MGCP Gateway handling.
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*
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* The first thing to remember is that each BSC has its own namespace/range
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* of endpoints. Whenever a BSSMAP ASSIGNMENT REQUEST is received this code
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* will be called to select an endpoint on the BSC. The mapping from original
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* multiplex/timeslot to BSC multiplex'/timeslot' will be stored.
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*
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* The second part is to take messages on the public MGCP GW interface
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* and forward them to the right BSC. This requires the MSC to first
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* assign the timeslot. This assumption has been true so far. We are using
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* the policy_cb of the MGCP protocol code to decide if the request should
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* be immediately answered or delayed. An extension "Z: noanswer" is used
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* to request the BSC to not respond. This is saving some bytes of bandwidth
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* and as we are using TCP to forward the message we know it will arrive.
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* The mgcp_do_read method reads these messages and hands them to the protocol
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* parsing code which will call the mentioned policy_cb. The bsc_mgcp_forward
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* method is used on the way back from the BSC to the network.
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*
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* The third part is to patch messages forwarded to the BSC. This includes
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* the endpoint number, the ports to be used inside the SDP file and maybe
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* some other bits.
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*
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*/
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/*
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* (C) 2010-2012 by Holger Hans Peter Freyther <zecke@selfish.org>
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* (C) 2010-2012 by On-Waves
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* All Rights Reserved
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU Affero General Public License as published by
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* the Free Software Foundation; either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU Affero General Public License for more details.
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*
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* You should have received a copy of the GNU Affero General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*
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*/
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#include <osmocom/bsc/bsc_nat.h>
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#include <osmocom/bsc/bsc_nat_callstats.h>
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#include <osmocom/bsc/bsc_nat_sccp.h>
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#include <osmocom/bsc/gsm_data.h>
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#include <osmocom/bsc/debug.h>
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#include <osmocom/bsc/ipaccess.h>
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#include <osmocom/legacy_mgcp/mgcp.h>
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#include <osmocom/legacy_mgcp/mgcp_internal.h>
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#include <osmocom/bsc/osmux.h>
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#include <osmocom/ctrl/control_cmd.h>
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#include <osmocom/sccp/sccp.h>
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#include <osmocom/core/talloc.h>
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#include <osmocom/gsm/gsm0808.h>
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#include <osmocom/gsm/protocol/gsm_08_08.h>
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#include <netinet/in.h>
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#include <arpa/inet.h>
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#include <errno.h>
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#include <unistd.h>
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static void send_direct(struct bsc_nat *nat, struct msgb *output)
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{
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if (osmo_wqueue_enqueue(&nat->mgcp_cfg->gw_fd, output) != 0) {
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LOGP(DMGCP, LOGL_ERROR, "Failed to queue MGCP msg.\n");
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msgb_free(output);
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}
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}
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static void mgcp_queue_for_call_agent(struct bsc_nat *nat, struct msgb *output)
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{
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if (nat->mgcp_ipa)
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bsc_nat_send_mgcp_to_msc(nat, output);
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else
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send_direct(nat, output);
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}
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int bsc_mgcp_nr_multiplexes(int max_endpoints)
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{
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int div = max_endpoints / 32;
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if ((max_endpoints % 32) != 0)
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div += 1;
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return div;
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}
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static int bsc_init_endps_if_needed(struct bsc_connection *con)
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{
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int multiplexes;
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/* we have done that */
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if (con->_endpoint_status)
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return 0;
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/* we have no config... */
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if (!con->cfg)
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return -1;
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multiplexes = bsc_mgcp_nr_multiplexes(con->cfg->max_endpoints);
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con->number_multiplexes = multiplexes;
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con->max_endpoints = con->cfg->max_endpoints;
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con->_endpoint_status = talloc_zero_array(con, char, 32 * multiplexes + 1);
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return con->_endpoint_status == NULL;
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}
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static int bsc_assign_endpoint(struct bsc_connection *bsc, struct nat_sccp_connection *con)
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{
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int multiplex;
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int timeslot;
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const int number_endpoints = bsc->max_endpoints;
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int i;
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mgcp_endpoint_to_timeslot(bsc->last_endpoint, &multiplex, ×lot);
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timeslot += 1;
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for (i = 0; i < number_endpoints; ++i) {
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int endpoint;
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/* Wrap around timeslots */
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if (timeslot == 0)
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timeslot = 1;
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if (timeslot == 0x1f) {
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timeslot = 1;
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multiplex += 1;
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}
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/* Wrap around the multiplex */
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if (multiplex >= bsc->number_multiplexes)
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multiplex = 0;
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endpoint = mgcp_timeslot_to_endpoint(multiplex, timeslot);
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/* Now check if we are allowed to assign this one */
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if (endpoint >= bsc->max_endpoints) {
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multiplex = 0;
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timeslot = 1;
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endpoint = mgcp_timeslot_to_endpoint(multiplex, timeslot);
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}
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if (bsc->_endpoint_status[endpoint] == 0) {
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bsc->_endpoint_status[endpoint] = 1;
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con->bsc_endp = endpoint;
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bsc->last_endpoint = endpoint;
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return 0;
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}
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timeslot += 1;
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}
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return -1;
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}
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static uint16_t create_cic(int endpoint)
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{
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int timeslot, multiplex;
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mgcp_endpoint_to_timeslot(endpoint, &multiplex, ×lot);
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return (multiplex << 5) | (timeslot & 0x1f);
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}
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int bsc_mgcp_assign_patch(struct nat_sccp_connection *con, struct msgb *msg)
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{
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struct nat_sccp_connection *mcon;
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struct tlv_parsed tp;
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uint16_t cic;
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uint8_t timeslot;
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uint8_t multiplex;
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unsigned int endp;
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if (!msg->l3h) {
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LOGP(DNAT, LOGL_ERROR, "Assignment message should have l3h pointer.\n");
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return -1;
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}
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if (msgb_l3len(msg) < 3) {
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LOGP(DNAT, LOGL_ERROR, "Assignment message has not enough space for GSM0808.\n");
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return -1;
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}
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tlv_parse(&tp, gsm0808_att_tlvdef(), msg->l3h + 3, msgb_l3len(msg) - 3, 0, 0);
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if (!TLVP_PRESENT(&tp, GSM0808_IE_CIRCUIT_IDENTITY_CODE)) {
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LOGP(DNAT, LOGL_ERROR, "Circuit identity code not found in assignment message.\n");
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return -1;
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}
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cic = ntohs(tlvp_val16_unal(&tp, GSM0808_IE_CIRCUIT_IDENTITY_CODE));
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timeslot = cic & 0x1f;
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multiplex = (cic & ~0x1f) >> 5;
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endp = mgcp_timeslot_to_endpoint(multiplex, timeslot);
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if (endp >= con->bsc->nat->mgcp_cfg->trunk.number_endpoints) {
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LOGP(DNAT, LOGL_ERROR,
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"MSC attempted to assign bad endpoint 0x%x\n",
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endp);
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return -1;
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}
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/* find stale connections using that endpoint */
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llist_for_each_entry(mcon, &con->bsc->nat->sccp_connections, list_entry) {
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if (mcon->msc_endp == endp) {
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LOGP(DNAT, LOGL_ERROR,
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"Endpoint %d was assigned to 0x%x and now 0x%x\n",
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endp,
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sccp_src_ref_to_int(&mcon->patched_ref),
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sccp_src_ref_to_int(&con->patched_ref));
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bsc_mgcp_dlcx(mcon);
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}
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}
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con->msc_endp = endp;
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if (bsc_init_endps_if_needed(con->bsc) != 0)
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return -1;
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if (bsc_assign_endpoint(con->bsc, con) != 0)
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return -1;
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/*
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* now patch the message for the new CIC...
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* still assumed to be one multiplex only
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*/
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cic = htons(create_cic(con->bsc_endp));
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memcpy((uint8_t *) TLVP_VAL(&tp, GSM0808_IE_CIRCUIT_IDENTITY_CODE),
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&cic, sizeof(cic));
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return 0;
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}
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static void bsc_mgcp_free_endpoint(struct bsc_nat *nat, int i)
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{
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if (nat->bsc_endpoints[i].transaction_id) {
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talloc_free(nat->bsc_endpoints[i].transaction_id);
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nat->bsc_endpoints[i].transaction_id = NULL;
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}
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nat->bsc_endpoints[i].transaction_state = 0;
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nat->bsc_endpoints[i].bsc = NULL;
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}
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void bsc_mgcp_free_endpoints(struct bsc_nat *nat)
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{
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int i;
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for (i = 1; i < nat->mgcp_cfg->trunk.number_endpoints; ++i){
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bsc_mgcp_free_endpoint(nat, i);
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mgcp_release_endp(&nat->mgcp_cfg->trunk.endpoints[i]);
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}
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}
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/* send a MDCX where we do not want a response */
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static void bsc_mgcp_send_mdcx(struct bsc_connection *bsc, int port, struct mgcp_endpoint *endp)
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{
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char buf[2096];
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int len;
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len = snprintf(buf, sizeof(buf),
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"MDCX 23 %x@mgw MGCP 1.0\r\n"
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"Z: noanswer\r\n"
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"\r\n"
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"c=IN IP4 %s\r\n"
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"m=audio %d RTP/AVP 255\r\n",
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port, mgcp_bts_src_addr(endp),
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endp->bts_end.local_port);
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if (len < 0) {
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LOGP(DMGCP, LOGL_ERROR, "snprintf for MDCX failed.\n");
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return;
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}
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bsc_write_mgcp(bsc, (uint8_t *) buf, len);
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}
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static void bsc_mgcp_send_dlcx(struct bsc_connection *bsc, int endpoint, int trans)
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{
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char buf[2096];
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int len;
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/*
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* The following is a bit of a spec violation. According to the
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* MGCP grammar the transaction id is are upto 9 digits but we
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* prefix it with an alpha numeric value so we can easily recognize
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* it as a response.
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*/
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len = snprintf(buf, sizeof(buf),
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"DLCX nat-%u %x@mgw MGCP 1.0\r\n",
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trans, endpoint);
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if (len < 0) {
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LOGP(DMGCP, LOGL_ERROR, "snprintf for DLCX failed.\n");
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return;
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}
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bsc_write_mgcp(bsc, (uint8_t *) buf, len);
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}
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void bsc_mgcp_init(struct nat_sccp_connection *con)
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{
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con->msc_endp = -1;
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con->bsc_endp = -1;
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}
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/**
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* This code will remember the network side of the audio statistics and
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* once the internal DLCX response arrives this can be combined with the
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* the BSC side and forwarded as a trap.
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*/
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static void remember_pending_dlcx(struct nat_sccp_connection *con, uint32_t transaction)
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{
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struct bsc_nat_call_stats *stats;
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struct bsc_connection *bsc = con->bsc;
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struct mgcp_endpoint *endp;
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stats = talloc_zero(bsc, struct bsc_nat_call_stats);
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if (!stats) {
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LOGP(DNAT, LOGL_NOTICE,
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"Failed to allocate statistics for endpoint 0x%x\n",
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con->msc_endp);
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return;
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}
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/* take the endpoint here */
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endp = &bsc->nat->mgcp_cfg->trunk.endpoints[con->msc_endp];
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stats->remote_ref = con->remote_ref;
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stats->src_ref = con->patched_ref;
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stats->ci = endp->ci;
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stats->bts_rtp_port = endp->bts_end.rtp_port;
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stats->bts_addr = endp->bts_end.addr;
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stats->net_rtp_port = endp->net_end.rtp_port;
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stats->net_addr = endp->net_end.addr;
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stats->net_ps = endp->net_end.packets;
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stats->net_os = endp->net_end.octets;
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stats->bts_pr = endp->bts_end.packets;
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stats->bts_or = endp->bts_end.octets;
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mgcp_state_calc_loss(&endp->bts_state, &endp->bts_end,
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&stats->bts_expected, &stats->bts_loss);
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stats->bts_jitter = mgcp_state_calc_jitter(&endp->bts_state);
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stats->trans_id = transaction;
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stats->msc_endpoint = con->msc_endp;
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/*
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* Too many pending requests.. let's remove the first two items.
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*/
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if (!llist_empty(&bsc->pending_dlcx) &&
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bsc->pending_dlcx_count >= bsc->cfg->max_endpoints * 3) {
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struct bsc_nat_call_stats *tmp;
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LOGP(DNAT, LOGL_ERROR,
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"Too many(%d) pending DLCX responses on BSC: %d\n",
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bsc->pending_dlcx_count, bsc->cfg->nr);
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bsc->pending_dlcx_count -= 1;
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tmp = (struct bsc_nat_call_stats *) bsc->pending_dlcx.next;
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llist_del(&tmp->entry);
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talloc_free(tmp);
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}
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bsc->pending_dlcx_count += 1;
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llist_add_tail(&stats->entry, &bsc->pending_dlcx);
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}
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|
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void bsc_mgcp_dlcx(struct nat_sccp_connection *con)
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{
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/* send a DLCX down the stream */
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if (con->bsc_endp != -1 && con->bsc->_endpoint_status) {
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LOGP(DNAT, LOGL_NOTICE,
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"Endpoint 0x%x was allocated for bsc: %d. Freeing it.\n",
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con->bsc_endp, con->bsc->cfg->nr);
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if (con->bsc->_endpoint_status[con->bsc_endp] != 1)
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LOGP(DNAT, LOGL_ERROR, "Endpoint 0x%x was not in use\n", con->bsc_endp);
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remember_pending_dlcx(con, con->bsc->next_transaction);
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con->bsc->_endpoint_status[con->bsc_endp] = 0;
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bsc_mgcp_send_dlcx(con->bsc, con->bsc_endp, con->bsc->next_transaction++);
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bsc_mgcp_free_endpoint(con->bsc->nat, con->msc_endp);
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}
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|
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bsc_mgcp_init(con);
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|
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}
|
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|
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/*
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* Search for the pending request
|
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*/
|
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static void handle_dlcx_response(struct bsc_connection *bsc, struct msgb *msg,
|
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int code, const char *transaction)
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{
|
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uint32_t trans_id = UINT32_MAX;
|
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uint32_t b_ps, b_os, n_pr, n_or, jitter;
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int loss;
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struct bsc_nat_call_stats *tmp, *stat = NULL;
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struct ctrl_cmd *cmd;
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|
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/* parse the transaction identifier */
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int rc = sscanf(transaction, "nat-%u", &trans_id);
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if (rc != 1) {
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LOGP(DNAT, LOGL_ERROR, "Can not parse transaction id: '%s'\n",
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transaction);
|
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return;
|
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}
|
|
|
|
/* find the answer for the request we made */
|
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llist_for_each_entry(tmp, &bsc->pending_dlcx, entry) {
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if (trans_id != tmp->trans_id)
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continue;
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|
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stat = tmp;
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break;
|
|
}
|
|
|
|
if (!stat) {
|
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LOGP(DNAT, LOGL_ERROR,
|
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"Can not find transaction for: %u\n", trans_id);
|
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return;
|
|
}
|
|
|
|
/* attempt to parse the data now */
|
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rc = mgcp_parse_stats(msg, &b_ps, &b_os, &n_pr, &n_or, &loss, &jitter);
|
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if (rc != 0)
|
|
LOGP(DNAT, LOGL_ERROR,
|
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"Can not parse connection statistics: %d\n", rc);
|
|
|
|
/* send a trap now */
|
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cmd = ctrl_cmd_create(bsc, CTRL_TYPE_TRAP);
|
|
if (!cmd) {
|
|
LOGP(DNAT, LOGL_ERROR,
|
|
"Creating a ctrl cmd failed.\n");
|
|
goto free_stat;
|
|
}
|
|
|
|
cmd->id = "0";
|
|
cmd->variable = talloc_asprintf(cmd, "net.0.bsc.%d.call_stats.v2",
|
|
bsc->cfg->nr);
|
|
cmd->reply = talloc_asprintf(cmd,
|
|
"mg_ip_addr=%s,mg_port=%d,",
|
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inet_ntoa(stat->net_addr),
|
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stat->net_rtp_port);
|
|
cmd->reply = talloc_asprintf_append(cmd->reply,
|
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"endpoint_ip_addr=%s,endpoint_port=%d,",
|
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inet_ntoa(stat->bts_addr),
|
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stat->bts_rtp_port);
|
|
cmd->reply = talloc_asprintf_append(cmd->reply,
|
|
"nat_pkt_in=%u,nat_pkt_out=%u,"
|
|
"nat_bytes_in=%u,nat_bytes_out=%u,"
|
|
"nat_jitter=%u,nat_pkt_lost=%d,",
|
|
stat->bts_pr, stat->net_ps,
|
|
stat->bts_or, stat->net_os,
|
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stat->bts_jitter, stat->bts_loss);
|
|
cmd->reply = talloc_asprintf_append(cmd->reply,
|
|
"bsc_pkt_in=%u,bsc_pkt_out=%u,"
|
|
"bsc_bytes_in=%u,bsc_bytes_out=%u,"
|
|
"bsc_jitter=%u,bsc_pkt_lost=%d,",
|
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n_pr, b_ps,
|
|
n_or, b_os,
|
|
jitter, loss);
|
|
cmd->reply = talloc_asprintf_append(cmd->reply,
|
|
"sccp_src_ref=%u,sccp_dst_ref=%u",
|
|
sccp_src_ref_to_int(&stat->src_ref),
|
|
sccp_src_ref_to_int(&stat->remote_ref));
|
|
|
|
/* send it and be done */
|
|
ctrl_cmd_send_to_all(bsc->nat->ctrl, cmd);
|
|
talloc_free(cmd);
|
|
|
|
free_stat:
|
|
bsc->pending_dlcx_count -= 1;
|
|
llist_del(&stat->entry);
|
|
talloc_free(stat);
|
|
}
|
|
|
|
|
|
struct nat_sccp_connection *bsc_mgcp_find_con(struct bsc_nat *nat, int endpoint)
|
|
{
|
|
struct nat_sccp_connection *con = NULL;
|
|
struct nat_sccp_connection *sccp;
|
|
|
|
llist_for_each_entry(sccp, &nat->sccp_connections, list_entry) {
|
|
if (sccp->msc_endp == -1)
|
|
continue;
|
|
if (sccp->msc_endp != endpoint)
|
|
continue;
|
|
|
|
con = sccp;
|
|
}
|
|
|
|
if (con)
|
|
return con;
|
|
|
|
LOGP(DMGCP, LOGL_ERROR,
|
|
"Failed to find the connection for endpoint: 0x%x\n", endpoint);
|
|
return NULL;
|
|
}
|
|
|
|
static int nat_osmux_only(struct mgcp_config *mgcp_cfg, struct bsc_config *bsc_cfg)
|
|
{
|
|
if (mgcp_cfg->osmux == OSMUX_USAGE_ONLY)
|
|
return 1;
|
|
if (bsc_cfg->osmux == OSMUX_USAGE_ONLY)
|
|
return 1;
|
|
return 0;
|
|
}
|
|
|
|
static int bsc_mgcp_policy_cb(struct mgcp_trunk_config *tcfg, int endpoint, int state, const char *transaction_id)
|
|
{
|
|
struct bsc_nat *nat;
|
|
struct bsc_endpoint *bsc_endp;
|
|
struct nat_sccp_connection *sccp;
|
|
struct mgcp_endpoint *mgcp_endp;
|
|
struct msgb *bsc_msg;
|
|
|
|
nat = tcfg->cfg->data;
|
|
bsc_endp = &nat->bsc_endpoints[endpoint];
|
|
mgcp_endp = &nat->mgcp_cfg->trunk.endpoints[endpoint];
|
|
|
|
if (bsc_endp->transaction_id) {
|
|
LOGP(DMGCP, LOGL_ERROR, "Endpoint 0x%x had pending transaction: '%s'\n",
|
|
endpoint, bsc_endp->transaction_id);
|
|
talloc_free(bsc_endp->transaction_id);
|
|
bsc_endp->transaction_id = NULL;
|
|
bsc_endp->transaction_state = 0;
|
|
}
|
|
bsc_endp->bsc = NULL;
|
|
|
|
sccp = bsc_mgcp_find_con(nat, endpoint);
|
|
|
|
if (!sccp) {
|
|
LOGP(DMGCP, LOGL_ERROR, "Did not find BSC for change on endpoint: 0x%x state: %d\n", endpoint, state);
|
|
|
|
switch (state) {
|
|
case MGCP_ENDP_CRCX:
|
|
return MGCP_POLICY_REJECT;
|
|
break;
|
|
case MGCP_ENDP_DLCX:
|
|
return MGCP_POLICY_CONT;
|
|
break;
|
|
case MGCP_ENDP_MDCX:
|
|
return MGCP_POLICY_CONT;
|
|
break;
|
|
default:
|
|
LOGP(DMGCP, LOGL_FATAL, "Unhandled state: %d\n", state);
|
|
return MGCP_POLICY_CONT;
|
|
break;
|
|
}
|
|
}
|
|
|
|
/* Allocate a Osmux circuit ID */
|
|
if (state == MGCP_ENDP_CRCX) {
|
|
if (nat->mgcp_cfg->osmux && sccp->bsc->cfg->osmux) {
|
|
osmux_allocate_cid(mgcp_endp);
|
|
if (mgcp_endp->osmux.allocated_cid < 0 &&
|
|
nat_osmux_only(nat->mgcp_cfg, sccp->bsc->cfg)) {
|
|
LOGP(DMGCP, LOGL_ERROR,
|
|
"Rejecting usage of endpoint\n");
|
|
return MGCP_POLICY_REJECT;
|
|
}
|
|
}
|
|
}
|
|
|
|
/* we need to generate a new and patched message */
|
|
bsc_msg = bsc_mgcp_rewrite((char *) nat->mgcp_msg, nat->mgcp_length,
|
|
sccp->bsc_endp, mgcp_bts_src_addr(mgcp_endp),
|
|
mgcp_endp->bts_end.local_port,
|
|
mgcp_endp->osmux.allocated_cid,
|
|
&mgcp_endp->net_end.codec.payload_type,
|
|
nat->sdp_ensure_amr_mode_set);
|
|
if (!bsc_msg) {
|
|
LOGP(DMGCP, LOGL_ERROR, "Failed to patch the msg.\n");
|
|
return MGCP_POLICY_CONT;
|
|
}
|
|
|
|
|
|
bsc_endp->transaction_id = talloc_strdup(nat, transaction_id);
|
|
bsc_endp->transaction_state = state;
|
|
bsc_endp->bsc = sccp->bsc;
|
|
|
|
/* we need to update some bits */
|
|
if (state == MGCP_ENDP_CRCX) {
|
|
struct sockaddr_in sock;
|
|
|
|
/* Annotate the allocated Osmux CID until the bsc confirms that
|
|
* it agrees to use Osmux for this voice flow.
|
|
*/
|
|
if (mgcp_endp->osmux.allocated_cid >= 0 &&
|
|
mgcp_endp->osmux.state != OSMUX_STATE_ENABLED) {
|
|
mgcp_endp->osmux.state = OSMUX_STATE_NEGOTIATING;
|
|
mgcp_endp->osmux.cid = mgcp_endp->osmux.allocated_cid;
|
|
}
|
|
|
|
socklen_t len = sizeof(sock);
|
|
if (getpeername(sccp->bsc->write_queue.bfd.fd, (struct sockaddr *) &sock, &len) != 0) {
|
|
LOGP(DMGCP, LOGL_ERROR, "Can not get the peername...%d/%s\n",
|
|
errno, strerror(errno));
|
|
} else {
|
|
mgcp_endp->bts_end.addr = sock.sin_addr;
|
|
}
|
|
|
|
/* send the message and a fake MDCX to force sending of a dummy packet */
|
|
bsc_write(sccp->bsc, bsc_msg, IPAC_PROTO_MGCP_OLD);
|
|
bsc_mgcp_send_mdcx(sccp->bsc, sccp->bsc_endp, mgcp_endp);
|
|
return MGCP_POLICY_DEFER;
|
|
} else if (state == MGCP_ENDP_DLCX) {
|
|
/* we will free the endpoint now and send a DLCX to the BSC */
|
|
msgb_free(bsc_msg);
|
|
bsc_mgcp_dlcx(sccp);
|
|
|
|
/* libmgcp clears the MGCP endpoint for us */
|
|
if (mgcp_endp->osmux.state == OSMUX_STATE_ENABLED)
|
|
osmux_release_cid(mgcp_endp);
|
|
|
|
return MGCP_POLICY_CONT;
|
|
} else {
|
|
bsc_write(sccp->bsc, bsc_msg, IPAC_PROTO_MGCP_OLD);
|
|
return MGCP_POLICY_DEFER;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* We do have a failure, free data downstream..
|
|
*/
|
|
static void free_chan_downstream(struct mgcp_endpoint *endp, struct bsc_endpoint *bsc_endp,
|
|
struct bsc_connection *bsc)
|
|
{
|
|
LOGP(DMGCP, LOGL_ERROR, "No CI, freeing endpoint 0x%x in state %d\n",
|
|
ENDPOINT_NUMBER(endp), bsc_endp->transaction_state);
|
|
|
|
/* if a CRCX failed... send a DLCX down the stream */
|
|
if (bsc_endp->transaction_state == MGCP_ENDP_CRCX) {
|
|
struct nat_sccp_connection *con;
|
|
con = bsc_mgcp_find_con(bsc->nat, ENDPOINT_NUMBER(endp));
|
|
if (!con) {
|
|
LOGP(DMGCP, LOGL_ERROR,
|
|
"No SCCP connection for endp 0x%x\n",
|
|
ENDPOINT_NUMBER(endp));
|
|
} else {
|
|
if (con->bsc == bsc) {
|
|
bsc_mgcp_send_dlcx(bsc, con->bsc_endp, con->bsc->next_transaction++);
|
|
} else {
|
|
LOGP(DMGCP, LOGL_ERROR,
|
|
"Endpoint belongs to a different BSC\n");
|
|
}
|
|
}
|
|
}
|
|
|
|
bsc_mgcp_free_endpoint(bsc->nat, ENDPOINT_NUMBER(endp));
|
|
mgcp_release_endp(endp);
|
|
}
|
|
|
|
static void bsc_mgcp_osmux_confirm(struct mgcp_endpoint *endp, const char *str)
|
|
{
|
|
unsigned int osmux_cid;
|
|
char *res;
|
|
|
|
res = strstr(str, "X-Osmux: ");
|
|
if (!res) {
|
|
LOGP(DMGCP, LOGL_INFO,
|
|
"BSC doesn't want to use Osmux, failing back to RTP\n");
|
|
goto err;
|
|
}
|
|
|
|
if (sscanf(res, "X-Osmux: %u", &osmux_cid) != 1) {
|
|
LOGP(DMGCP, LOGL_ERROR, "Failed to parse Osmux CID '%s'\n",
|
|
str);
|
|
goto err;
|
|
}
|
|
|
|
if (endp->osmux.cid != osmux_cid) {
|
|
LOGP(DMGCP, LOGL_ERROR,
|
|
"BSC sent us wrong CID %u, we expected %u",
|
|
osmux_cid, endp->osmux.cid);
|
|
goto err;
|
|
}
|
|
|
|
LOGP(DMGCP, LOGL_NOTICE, "bsc accepted to use Osmux (cid=%u)\n",
|
|
osmux_cid);
|
|
endp->osmux.state = OSMUX_STATE_ACTIVATING;
|
|
return;
|
|
err:
|
|
osmux_release_cid(endp);
|
|
endp->osmux.state = OSMUX_STATE_DISABLED;
|
|
}
|
|
|
|
/*
|
|
* We have received a msg from the BSC. We will see if we know
|
|
* this transaction and if it belongs to the BSC. Then we will
|
|
* need to patch the content to point to the local network and we
|
|
* need to update the I: that was assigned by the BSS.
|
|
*
|
|
* Only responses to CRCX and DLCX should arrive here. The DLCX
|
|
* needs to be handled specially to combine the two statistics.
|
|
*/
|
|
void bsc_mgcp_forward(struct bsc_connection *bsc, struct msgb *msg)
|
|
{
|
|
struct msgb *output;
|
|
struct bsc_endpoint *bsc_endp = NULL;
|
|
struct mgcp_endpoint *endp = NULL;
|
|
int i, code;
|
|
char transaction_id[60];
|
|
|
|
/* Some assumption that our buffer is big enough.. and null terminate */
|
|
if (msgb_l2len(msg) > 2000) {
|
|
LOGP(DMGCP, LOGL_ERROR, "MGCP message too long.\n");
|
|
return;
|
|
}
|
|
|
|
msg->l2h[msgb_l2len(msg)] = '\0';
|
|
|
|
if (bsc_mgcp_parse_response((const char *) msg->l2h, &code, transaction_id) != 0) {
|
|
LOGP(DMGCP, LOGL_ERROR, "Failed to parse response code.\n");
|
|
return;
|
|
}
|
|
|
|
for (i = 1; i < bsc->nat->mgcp_cfg->trunk.number_endpoints; ++i) {
|
|
if (bsc->nat->bsc_endpoints[i].bsc != bsc)
|
|
continue;
|
|
/* no one listening? a bug? */
|
|
if (!bsc->nat->bsc_endpoints[i].transaction_id)
|
|
continue;
|
|
if (strcmp(transaction_id, bsc->nat->bsc_endpoints[i].transaction_id) != 0)
|
|
continue;
|
|
|
|
endp = &bsc->nat->mgcp_cfg->trunk.endpoints[i];
|
|
bsc_endp = &bsc->nat->bsc_endpoints[i];
|
|
break;
|
|
}
|
|
|
|
if (!bsc_endp && strncmp("nat-", transaction_id, 4) == 0) {
|
|
handle_dlcx_response(bsc, msg, code, transaction_id);
|
|
return;
|
|
}
|
|
|
|
if (!bsc_endp) {
|
|
LOGP(DMGCP, LOGL_ERROR, "Could not find active endpoint: %s for msg: '%s'\n",
|
|
transaction_id, (const char *) msg->l2h);
|
|
return;
|
|
}
|
|
|
|
endp->ci = bsc_mgcp_extract_ci((const char *) msg->l2h);
|
|
if (endp->ci == CI_UNUSED) {
|
|
free_chan_downstream(endp, bsc_endp, bsc);
|
|
return;
|
|
}
|
|
|
|
if (endp->osmux.state == OSMUX_STATE_NEGOTIATING)
|
|
bsc_mgcp_osmux_confirm(endp, (const char *) msg->l2h);
|
|
|
|
/* If we require osmux and it is disabled.. fail */
|
|
if (nat_osmux_only(bsc->nat->mgcp_cfg, bsc->cfg) &&
|
|
endp->osmux.state == OSMUX_STATE_DISABLED) {
|
|
LOGP(DMGCP, LOGL_ERROR,
|
|
"Failed to activate osmux endpoint 0x%x\n",
|
|
ENDPOINT_NUMBER(endp));
|
|
free_chan_downstream(endp, bsc_endp, bsc);
|
|
return;
|
|
}
|
|
|
|
/* free some stuff */
|
|
talloc_free(bsc_endp->transaction_id);
|
|
bsc_endp->transaction_id = NULL;
|
|
bsc_endp->transaction_state = 0;
|
|
|
|
/*
|
|
* rewrite the information. In case the endpoint was deleted
|
|
* there should be nothing for us to rewrite so putting endp->rtp_port
|
|
* with the value of 0 should be no problem.
|
|
*/
|
|
output = bsc_mgcp_rewrite((char * ) msg->l2h, msgb_l2len(msg), -1,
|
|
mgcp_net_src_addr(endp),
|
|
endp->net_end.local_port, -1,
|
|
&endp->bts_end.codec.payload_type,
|
|
bsc->nat->sdp_ensure_amr_mode_set);
|
|
if (!output) {
|
|
LOGP(DMGCP, LOGL_ERROR, "Failed to rewrite MGCP msg.\n");
|
|
return;
|
|
}
|
|
|
|
mgcp_queue_for_call_agent(bsc->nat, output);
|
|
}
|
|
|
|
int bsc_mgcp_parse_response(const char *str, int *code, char transaction[60])
|
|
{
|
|
int rc;
|
|
/* we want to parse two strings */
|
|
rc = sscanf(str, "%3d %59s\n", code, transaction) != 2;
|
|
transaction[59] = '\0';
|
|
return rc;
|
|
}
|
|
|
|
uint32_t bsc_mgcp_extract_ci(const char *str)
|
|
{
|
|
unsigned int ci;
|
|
char *res = strstr(str, "I: ");
|
|
if (!res) {
|
|
LOGP(DMGCP, LOGL_ERROR, "No CI in msg '%s'\n", str);
|
|
return CI_UNUSED;
|
|
}
|
|
|
|
if (sscanf(res, "I: %u", &ci) != 1) {
|
|
LOGP(DMGCP, LOGL_ERROR, "Failed to parse CI in msg '%s'\n", str);
|
|
return CI_UNUSED;
|
|
}
|
|
|
|
return ci;
|
|
}
|
|
|
|
/**
|
|
* Create a new MGCPCommand based on the input and endpoint from a message
|
|
*/
|
|
static void patch_mgcp(struct msgb *output, const char *op, const char *tok,
|
|
int endp, int len, int cr, int osmux_cid)
|
|
{
|
|
int slen;
|
|
int ret;
|
|
char buf[40];
|
|
char osmux_extension[strlen("\nX-Osmux: 255") + 1];
|
|
|
|
buf[0] = buf[39] = '\0';
|
|
ret = sscanf(tok, "%*s %s", buf);
|
|
if (ret != 1) {
|
|
LOGP(DMGCP, LOGL_ERROR,
|
|
"Failed to find Endpoint in: %s\n", tok);
|
|
return;
|
|
}
|
|
|
|
if (osmux_cid >= 0)
|
|
sprintf(osmux_extension, "\nX-Osmux: %u", osmux_cid & 0xff);
|
|
else
|
|
osmux_extension[0] = '\0';
|
|
|
|
slen = sprintf((char *) output->l3h, "%s %s %x@mgw MGCP 1.0%s%s",
|
|
op, buf, endp, osmux_extension, cr ? "\r\n" : "\n");
|
|
output->l3h = msgb_put(output, slen);
|
|
}
|
|
|
|
/* we need to replace some strings... */
|
|
struct msgb *bsc_mgcp_rewrite(char *input, int length, int endpoint,
|
|
const char *ip, int port, int osmux_cid,
|
|
int *first_payload_type, int ensure_mode_set)
|
|
{
|
|
static const char crcx_str[] = "CRCX ";
|
|
static const char dlcx_str[] = "DLCX ";
|
|
static const char mdcx_str[] = "MDCX ";
|
|
|
|
static const char ip_str[] = "c=IN IP4 ";
|
|
static const char aud_str[] = "m=audio ";
|
|
static const char fmt_str[] = "a=fmtp:";
|
|
|
|
char buf[128];
|
|
char *running, *token;
|
|
struct msgb *output;
|
|
|
|
/* keep state to add the a=fmtp line */
|
|
int found_fmtp = 0;
|
|
int payload = -1;
|
|
int cr = 1;
|
|
|
|
if (length > 4096 - 256) {
|
|
LOGP(DMGCP, LOGL_ERROR, "Input is too long.\n");
|
|
return NULL;
|
|
}
|
|
|
|
output = msgb_alloc_headroom(4096, 128, "MGCP rewritten");
|
|
if (!output) {
|
|
LOGP(DMGCP, LOGL_ERROR, "Failed to allocate new MGCP msg.\n");
|
|
return NULL;
|
|
}
|
|
|
|
running = input;
|
|
output->l2h = output->data;
|
|
output->l3h = output->l2h;
|
|
for (token = strsep(&running, "\n"); running; token = strsep(&running, "\n")) {
|
|
int len = strlen(token);
|
|
cr = len > 0 && token[len - 1] == '\r';
|
|
|
|
if (strncmp(crcx_str, token, (sizeof crcx_str) - 1) == 0) {
|
|
patch_mgcp(output, "CRCX", token, endpoint, len, cr, osmux_cid);
|
|
} else if (strncmp(dlcx_str, token, (sizeof dlcx_str) - 1) == 0) {
|
|
patch_mgcp(output, "DLCX", token, endpoint, len, cr, -1);
|
|
} else if (strncmp(mdcx_str, token, (sizeof mdcx_str) - 1) == 0) {
|
|
patch_mgcp(output, "MDCX", token, endpoint, len, cr, -1);
|
|
} else if (strncmp(ip_str, token, (sizeof ip_str) - 1) == 0) {
|
|
output->l3h = msgb_put(output, strlen(ip_str));
|
|
memcpy(output->l3h, ip_str, strlen(ip_str));
|
|
output->l3h = msgb_put(output, strlen(ip));
|
|
memcpy(output->l3h, ip, strlen(ip));
|
|
|
|
if (cr) {
|
|
output->l3h = msgb_put(output, 2);
|
|
output->l3h[0] = '\r';
|
|
output->l3h[1] = '\n';
|
|
} else {
|
|
output->l3h = msgb_put(output, 1);
|
|
output->l3h[0] = '\n';
|
|
}
|
|
} else if (strncmp(aud_str, token, (sizeof aud_str) - 1) == 0) {
|
|
int offset;
|
|
if (sscanf(token, "m=audio %*d RTP/AVP %n%d", &offset, &payload) != 1) {
|
|
LOGP(DMGCP, LOGL_ERROR, "Could not parsed audio line.\n");
|
|
msgb_free(output);
|
|
return NULL;
|
|
}
|
|
|
|
snprintf(buf, sizeof(buf)-1, "m=audio %d RTP/AVP %s\n",
|
|
port, &token[offset]);
|
|
buf[sizeof(buf)-1] = '\0';
|
|
|
|
output->l3h = msgb_put(output, strlen(buf));
|
|
memcpy(output->l3h, buf, strlen(buf));
|
|
} else if (strncmp(fmt_str, token, (sizeof fmt_str) - 1) == 0) {
|
|
found_fmtp = 1;
|
|
goto copy;
|
|
} else {
|
|
copy:
|
|
output->l3h = msgb_put(output, len + 1);
|
|
memcpy(output->l3h, token, len);
|
|
output->l3h[len] = '\n';
|
|
}
|
|
}
|
|
|
|
/*
|
|
* the above code made sure that we have 128 bytes lefts. So we can
|
|
* safely append another line.
|
|
*/
|
|
if (ensure_mode_set && !found_fmtp && payload != -1) {
|
|
snprintf(buf, sizeof(buf) - 1, "a=fmtp:%d mode-set=2%s",
|
|
payload, cr ? "\r\n" : "\n");
|
|
buf[sizeof(buf) - 1] = '\0';
|
|
output->l3h = msgb_put(output, strlen(buf));
|
|
memcpy(output->l3h, buf, strlen(buf));
|
|
}
|
|
|
|
if (payload != -1 && first_payload_type)
|
|
*first_payload_type = payload;
|
|
|
|
return output;
|
|
}
|
|
|
|
/*
|
|
* This comes from the MSC and we will now parse it. The caller needs
|
|
* to free the msgb.
|
|
*/
|
|
void bsc_nat_handle_mgcp(struct bsc_nat *nat, struct msgb *msg)
|
|
{
|
|
struct msgb *resp;
|
|
|
|
if (!nat->mgcp_ipa) {
|
|
LOGP(DMGCP, LOGL_ERROR, "MGCP message not allowed on IPA.\n");
|
|
return;
|
|
}
|
|
|
|
if (msgb_l2len(msg) > sizeof(nat->mgcp_msg) - 1) {
|
|
LOGP(DMGCP, LOGL_ERROR, "MGCP msg too big for handling.\n");
|
|
return;
|
|
}
|
|
|
|
memcpy(nat->mgcp_msg, msg->l2h, msgb_l2len(msg));
|
|
nat->mgcp_length = msgb_l2len(msg);
|
|
nat->mgcp_msg[nat->mgcp_length] = '\0';
|
|
|
|
/* now handle the message */
|
|
resp = mgcp_handle_message(nat->mgcp_cfg, msg);
|
|
|
|
/* we do have a direct answer... e.g. AUEP */
|
|
if (resp)
|
|
mgcp_queue_for_call_agent(nat, resp);
|
|
|
|
return;
|
|
}
|
|
|
|
static int mgcp_do_read(struct osmo_fd *fd)
|
|
{
|
|
struct bsc_nat *nat;
|
|
struct msgb *msg, *resp;
|
|
int rc;
|
|
|
|
nat = fd->data;
|
|
|
|
rc = read(fd->fd, nat->mgcp_msg, sizeof(nat->mgcp_msg) - 1);
|
|
if (rc <= 0) {
|
|
LOGP(DMGCP, LOGL_ERROR, "Failed to read errno: %d\n", errno);
|
|
return -1;
|
|
}
|
|
|
|
nat->mgcp_msg[rc] = '\0';
|
|
nat->mgcp_length = rc;
|
|
|
|
msg = msgb_alloc(sizeof(nat->mgcp_msg), "MGCP GW Read");
|
|
if (!msg) {
|
|
LOGP(DMGCP, LOGL_ERROR, "Failed to create buffer.\n");
|
|
return -1;
|
|
}
|
|
|
|
msg->l2h = msgb_put(msg, rc);
|
|
memcpy(msg->l2h, nat->mgcp_msg, msgb_l2len(msg));
|
|
resp = mgcp_handle_message(nat->mgcp_cfg, msg);
|
|
msgb_free(msg);
|
|
|
|
/* we do have a direct answer... e.g. AUEP */
|
|
if (resp)
|
|
mgcp_queue_for_call_agent(nat, resp);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int mgcp_do_write(struct osmo_fd *bfd, struct msgb *msg)
|
|
{
|
|
int rc;
|
|
|
|
rc = write(bfd->fd, msg->data, msg->len);
|
|
|
|
if (rc != msg->len) {
|
|
LOGP(DMGCP, LOGL_ERROR, "Failed to write msg to MGCP CallAgent.\n");
|
|
return -1;
|
|
}
|
|
|
|
return rc;
|
|
}
|
|
|
|
static int init_mgcp_socket(struct bsc_nat *nat, struct mgcp_config *cfg)
|
|
{
|
|
struct sockaddr_in addr;
|
|
int on;
|
|
|
|
cfg->gw_fd.bfd.fd = socket(AF_INET, SOCK_DGRAM, 0);
|
|
if (cfg->gw_fd.bfd.fd < 0) {
|
|
LOGP(DMGCP, LOGL_ERROR, "Failed to create MGCP socket. errno: %d\n", errno);
|
|
return -1;
|
|
}
|
|
|
|
on = 1;
|
|
setsockopt(cfg->gw_fd.bfd.fd, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on));
|
|
|
|
memset(&addr, 0, sizeof(addr));
|
|
addr.sin_family = AF_INET;
|
|
addr.sin_port = htons(cfg->source_port);
|
|
inet_aton(cfg->source_addr, &addr.sin_addr);
|
|
|
|
if (bind(cfg->gw_fd.bfd.fd, (struct sockaddr *) &addr, sizeof(addr)) < 0) {
|
|
LOGP(DMGCP, LOGL_ERROR, "Failed to bind on %s:%d errno: %d\n",
|
|
cfg->source_addr, cfg->source_port, errno);
|
|
close(cfg->gw_fd.bfd.fd);
|
|
cfg->gw_fd.bfd.fd = -1;
|
|
return -1;
|
|
}
|
|
|
|
addr.sin_port = htons(2727);
|
|
inet_aton(cfg->call_agent_addr, &addr.sin_addr);
|
|
if (connect(cfg->gw_fd.bfd.fd, (struct sockaddr *) &addr, sizeof(addr)) < 0) {
|
|
LOGP(DMGCP, LOGL_ERROR, "Failed to connect to: '%s'. errno: %d\n",
|
|
cfg->call_agent_addr, errno);
|
|
close(cfg->gw_fd.bfd.fd);
|
|
cfg->gw_fd.bfd.fd = -1;
|
|
return -1;
|
|
}
|
|
|
|
osmo_wqueue_init(&cfg->gw_fd, 10);
|
|
cfg->gw_fd.bfd.when = BSC_FD_READ;
|
|
cfg->gw_fd.bfd.data = nat;
|
|
cfg->gw_fd.read_cb = mgcp_do_read;
|
|
cfg->gw_fd.write_cb = mgcp_do_write;
|
|
|
|
if (osmo_fd_register(&cfg->gw_fd.bfd) != 0) {
|
|
LOGP(DMGCP, LOGL_ERROR, "Failed to register MGCP fd.\n");
|
|
close(cfg->gw_fd.bfd.fd);
|
|
cfg->gw_fd.bfd.fd = -1;
|
|
return -1;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
int bsc_mgcp_nat_init(struct bsc_nat *nat)
|
|
{
|
|
struct mgcp_config *cfg = nat->mgcp_cfg;
|
|
|
|
if (!cfg->call_agent_addr) {
|
|
LOGP(DMGCP, LOGL_ERROR, "The BSC nat requires the call agent ip to be set.\n");
|
|
return -1;
|
|
}
|
|
|
|
if (cfg->bts_ip) {
|
|
LOGP(DMGCP, LOGL_ERROR, "Do not set the BTS ip for the nat.\n");
|
|
return -1;
|
|
}
|
|
|
|
/* initialize the MGCP socket */
|
|
if (!nat->mgcp_ipa) {
|
|
int rc = init_mgcp_socket(nat, cfg);
|
|
if (rc != 0)
|
|
return rc;
|
|
}
|
|
|
|
|
|
/* some more MGCP config handling */
|
|
cfg->data = nat;
|
|
cfg->policy_cb = bsc_mgcp_policy_cb;
|
|
|
|
if (cfg->bts_ip)
|
|
talloc_free(cfg->bts_ip);
|
|
cfg->bts_ip = "";
|
|
|
|
nat->bsc_endpoints = talloc_zero_array(nat,
|
|
struct bsc_endpoint,
|
|
cfg->trunk.number_endpoints + 1);
|
|
if (!nat->bsc_endpoints) {
|
|
LOGP(DMGCP, LOGL_ERROR, "Failed to allocate nat endpoints\n");
|
|
close(cfg->gw_fd.bfd.fd);
|
|
cfg->gw_fd.bfd.fd = -1;
|
|
return -1;
|
|
}
|
|
|
|
if (mgcp_reset_transcoder(cfg) < 0) {
|
|
LOGP(DMGCP, LOGL_ERROR, "Failed to send packet to the transcoder.\n");
|
|
talloc_free(nat->bsc_endpoints);
|
|
nat->bsc_endpoints = NULL;
|
|
close(cfg->gw_fd.bfd.fd);
|
|
cfg->gw_fd.bfd.fd = -1;
|
|
return -1;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
void bsc_mgcp_clear_endpoints_for(struct bsc_connection *bsc)
|
|
{
|
|
struct rate_ctr *ctr = NULL;
|
|
int i;
|
|
|
|
if (bsc->cfg)
|
|
ctr = &bsc->cfg->stats.ctrg->ctr[BCFG_CTR_DROPPED_CALLS];
|
|
|
|
for (i = 1; i < bsc->nat->mgcp_cfg->trunk.number_endpoints; ++i) {
|
|
struct bsc_endpoint *bsc_endp = &bsc->nat->bsc_endpoints[i];
|
|
|
|
if (bsc_endp->bsc != bsc)
|
|
continue;
|
|
|
|
if (ctr)
|
|
rate_ctr_inc(ctr);
|
|
|
|
bsc_mgcp_free_endpoint(bsc->nat, i);
|
|
mgcp_release_endp(&bsc->nat->mgcp_cfg->trunk.endpoints[i]);
|
|
}
|
|
}
|