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/*
* Handle the connection to the MSC. This include ping/timeout/reconnect
* (C) 2008-2018 by Harald Welte <laforge@gnumonks.org>
* (C) 2009-2015 by Holger Hans Peter Freyther <zecke@selfish.org>
* (C) 2009-2015 by On-Waves
* All Rights Reserved
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License as published by
* the Free Software Foundation; either version 3 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 Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
*/
#include <osmocom/ctrl/control_cmd.h>
#include <osmocom/ctrl/control_if.h>
#include <osmocom/crypt/auth.h>
#include <osmocom/bsc/debug.h>
#include <osmocom/bsc/gsm_data.h>
#include <osmocom/bsc/ipaccess.h>
#include <osmocom/bsc/bsc_msc_data.h>
#include <osmocom/bsc/osmo_bsc_sigtran.h>
#include <osmocom/bsc/signal.h>
#include <osmocom/core/talloc.h>
#include <osmocom/core/socket.h>
#include <osmocom/gsm/gsm0808.h>
#include <osmocom/abis/ipa.h>
#include <osmocom/mgcp_client/mgcp_client.h>
#include <sys/socket.h>
#include <netinet/tcp.h>
#include <unistd.h>
static const struct rate_ctr_desc msc_ctr_description[] = {
/* Rx message counters (per specific message) */
[MSC_CTR_BSSMAP_RX_UDT_RESET_ACKNOWLEDGE] = {"bssmap:rx:udt:reset:ack", "Number of received BSSMAP UDT RESET ACKNOWLEDGE messages"},
[MSC_CTR_BSSMAP_RX_UDT_RESET] = {"bssmap:rx:udt:reset:request", "Number of received BSSMAP UDT RESET messages"},
[MSC_CTR_BSSMAP_RX_UDT_PAGING] = {"bssmap:rx:udt:paging", "Number of received BSSMAP UDT PAGING messages"},
[MSC_CTR_BSSMAP_RX_UDT_UNKNOWN] = {"bssmap:rx:udt:err_unknown", "Number of received BSSMAP unknown UDT messages"},
[MSC_CTR_BSSMAP_RX_DT1_CLEAR_CMD] = {"bssmap:rx:dt1:clear:cmd", "Number of received BSSMAP DT1 CLEAR CMD messages"},
[MSC_CTR_BSSMAP_RX_DT1_CIPHER_MODE_CMD] = {"bssmap:rx:dt1:cipher_mode:cmd", "Number of received BSSMAP DT1 CIPHER MODE CMD messages"},
[MSC_CTR_BSSMAP_RX_DT1_ASSIGMENT_RQST] = {"bssmap:rx:dt1:assignment:rqst", "Number of received BSSMAP DT1 ASSIGMENT RQST messages"},
[MSC_CTR_BSSMAP_RX_DT1_LCLS_CONNECT_CTRL] = {"bssmap:rx:dt1:lcls_connect_ctrl:cmd", "Number of received BSSMAP DT1 LCLS CONNECT CTRL messages"},
[MSC_CTR_BSSMAP_RX_DT1_HANDOVER_CMD] = {"bssmap:rx:dt1:handover:cmd", "Number of received BSSMAP DT1 HANDOVER CMD messages"},
[MSC_CTR_BSSMAP_RX_DT1_CLASSMARK_RQST] = {"bssmap:rx:dt1:classmark:rqst", "Number of received BSSMAP DT1 CLASSMARK RQST messages"},
[MSC_CTR_BSSMAP_RX_DT1_UNKNOWN] = {"bssmap:rx:dt1:err_unknown", "Number of received BSSMAP unknown DT1 messages"},
[MSC_CTR_BSSMAP_RX_DT1_DTAP] = {"bssmap:rx:dt1:dtap:good", "Number of received BSSMAP DTAP messages"},
[MSC_CTR_BSSMAP_RX_DT1_DTAP_ERROR] = {"bssmap:rx:dt1:dtap:error", "Number of received BSSMAP DTAP messages with errors"},
/* Tx message counters (per message type)
*
* The counters here follow the logic of the osmo_bsc_sigtran_send() function
* which receives DT1 messages from the upper layers and actually sends them to the MSC.
* These counters cover all messages passed to the function by the upper layers: */
[MSC_CTR_BSSMAP_TX_BSS_MANAGEMENT] = {"bssmap:tx:type:bss_management", "Number of transmitted BSS MANAGEMENT messages"},
[MSC_CTR_BSSMAP_TX_DTAP] = {"bssmap:tx:type:dtap", "Number of transmitted DTAP messages"},
[MSC_CTR_BSSMAP_TX_UNKNOWN] = {"bssmap:tx:type:err_unknown", "Number of transmitted messages with unknown type (an error in our code?)"},
[MSC_CTR_BSSMAP_TX_SHORT] = {"bssmap:tx:type:err_short", "Number of transmitted messages which are too short (an error in our code?)"},
/* The next counters are also counted in the osmo_bsc_sigtran_send() function and
* sum up to the exactly same number as the counters above but instead of message
* classes they split by the result of the sending attempt: */
[MSC_CTR_BSSMAP_TX_ERR_CONN_NOT_READY] = {"bssmap:tx:result:err_conn_not_ready", "Number of BSSMAP messages we tried to send when the connection was not ready yet"},
[MSC_CTR_BSSMAP_TX_ERR_SEND] = {"bssmap:tx:result:err_send", "Number of socket errors while sending BSSMAP messages"},
[MSC_CTR_BSSMAP_TX_SUCCESS] = {"bssmap:tx:result:success", "Number of successfully sent BSSMAP messages"},
/* Tx message counters (per specific message)
*
* Theoretically, the DT1 counters should sum up to the same number as the Tx counters
* above but since these counters are coming from the upper layers, there might be
* some difference if we forget some code path. */
[MSC_CTR_BSSMAP_TX_UDT_RESET] = {"bssmap:tx:udt:reset:request", "Number of transmitted BSSMAP UDT RESET messages"},
[MSC_CTR_BSSMAP_TX_UDT_RESET_ACK] = {"bssmap:tx:udt:reset:ack", "Number of transmitted BSSMAP UDT RESET ACK messages"},
[MSC_CTR_BSSMAP_TX_DT1_CLEAR_RQST] = {"bssmap:tx:dt1:clear:rqst", "Number of transmitted BSSMAP DT1 CLEAR RQSTtx messages"},
[MSC_CTR_BSSMAP_TX_DT1_CLEAR_COMPLETE] = {"bssmap:tx:dt1:clear:complete", "Number of transmitted BSSMAP DT1 CLEAR COMPLETE messages"},
[MSC_CTR_BSSMAP_TX_DT1_ASSIGMENT_FAILURE] = {"bssmap:tx:dt1:assigment:failure", "Number of transmitted BSSMAP DT1 ASSIGMENT FAILURE messages"},
[MSC_CTR_BSSMAP_TX_DT1_ASSIGMENT_COMPLETE] = {"bssmap:tx:dt1:assigment:complete", "Number of transmitted BSSMAP DT1 ASSIGMENT COMPLETE messages"},
[MSC_CTR_BSSMAP_TX_DT1_SAPI_N_REJECT] = {"bssmap:tx:dt1:sapi_n:reject", "Number of transmitted BSSMAP DT1 SAPI N REJECT messages"},
[MSC_CTR_BSSMAP_TX_DT1_CIPHER_COMPLETE] = {"bssmap:tx:dt1:cipher_mode:complete", "Number of transmitted BSSMAP DT1 CIPHER COMPLETE messages"},
[MSC_CTR_BSSMAP_TX_DT1_CIPHER_REJECT] = {"bssmap:tx:dt1:cipher_mode:reject", "Number of transmitted BSSMAP DT1 CIPHER REJECT messages"},
[MSC_CTR_BSSMAP_TX_DT1_CLASSMARK_UPDATE] = {"bssmap:tx:dt1:classmark:update", "Number of transmitted BSSMAP DT1 CLASSMARK UPDATE messages"},
[MSC_CTR_BSSMAP_TX_DT1_LCLS_CONNECT_CTRL_ACK] = {"bssmap:tx:dt1:lcls_connect_ctrl:ack", "Number of transmitted BSSMAP DT1 LCLS CONNECT CTRL ACK messages"},
[MSC_CTR_BSSMAP_TX_DT1_HANDOVER_REQUIRED] = {"bssmap:tx:dt1:handover:required", "Number of transmitted BSSMAP DT1 HANDOVER REQUIRED messages"},
[MSC_CTR_BSSMAP_TX_DT1_HANDOVER_PERFORMED] = {"bssmap:tx:dt1:handover:performed", "Number of transmitted BSSMAP DT1 HANDOVER PERFORMED messages"},
[MSC_CTR_BSSMAP_TX_DT1_HANDOVER_RQST_ACKNOWLEDGE] = {"bssmap:tx:dt1:handover:rqst_acknowledge", "Number of transmitted BSSMAP DT1 HANDOVER RQST ACKNOWLEDGE messages"},
[MSC_CTR_BSSMAP_TX_DT1_HANDOVER_DETECT] = {"bssmap:tx:dt1:handover:detect", "Number of transmitted BSSMAP DT1 HANDOVER DETECT messages"},
[MSC_CTR_BSSMAP_TX_DT1_HANDOVER_COMPLETE] = {"bssmap:tx:dt1:handover:complete", "Number of transmitted BSSMAP DT1 HANDOVER COMPLETE messages"},
[MSC_CTR_BSSMAP_TX_DT1_HANDOVER_FAILURE] = {"bssmap:tx:dt1:handover:failure", "Number of transmitted BSSMAP DT1 HANDOVER FAILURE messages"},
[MSC_CTR_BSSMAP_TX_DT1_DTAP] = {"bssmap:tx:dt1:dtap", "Number of transmitted BSSMAP DT1 DTAP messages"},
};
static const struct rate_ctr_group_desc msc_ctrg_desc = {
"msc",
"mobile switching center",
OSMO_STATS_CLASS_GLOBAL,
ARRAY_SIZE(msc_ctr_description),
msc_ctr_description,
};
static const struct osmo_stat_item_desc msc_stat_desc[] = {
{ "msc_links:active", "Number of active MSC links", "", 16, 0 },
{ "msc_links:total", "Number of configured MSC links", "", 16, 0 },
};
static const struct osmo_stat_item_group_desc msc_statg_desc = {
.group_name_prefix = "msc",
.group_description = "mobile switching center",
.class_id = OSMO_STATS_CLASS_GLOBAL,
.num_items = ARRAY_SIZE(msc_stat_desc),
.item_desc = msc_stat_desc,
};
int osmo_bsc_msc_init(struct bsc_msc_data *msc)
{
struct gsm_network *net = msc->network;
uint16_t mgw_port;
int rc;
if (net->mgw.conf->remote_port >= 0)
mgw_port = net->mgw.conf->remote_port;
else
mgw_port = MGCP_CLIENT_REMOTE_PORT_DEFAULT;
rc = osmo_sock_init2_ofd(&msc->mgcp_ipa.ofd, AF_INET, SOCK_DGRAM, IPPROTO_UDP,
msc->mgcp_ipa.local_addr, msc->mgcp_ipa.local_port,
net->mgw.conf->remote_addr, mgw_port,
OSMO_SOCK_F_BIND | OSMO_SOCK_F_CONNECT);
if (rc < 0) {
LOGP(DMSC, LOGL_ERROR, "msc %u: Could not create/connect/bind MGCP proxy socket: %d\n",
msc->nr, rc);
return rc;
}
return 0;
}
struct bsc_msc_data *osmo_msc_data_find(struct gsm_network *net, int nr)
{
struct bsc_msc_data *msc_data;
llist_for_each_entry(msc_data, &net->bsc_data->mscs, entry)
if (msc_data->nr == nr)
return msc_data;
return NULL;
}
struct bsc_msc_data *osmo_msc_data_alloc(struct gsm_network *net, int nr)
{
struct bsc_msc_data *msc_data;
unsigned int i;
/* check if there is already one */
msc_data = osmo_msc_data_find(net, nr);
if (msc_data)
return msc_data;
msc_data = talloc_zero(net, struct bsc_msc_data);
if (!msc_data)
return NULL;
/* init statistics */
msc_data->msc_ctrs = rate_ctr_group_alloc(net, &msc_ctrg_desc, nr);
if (!msc_data->msc_ctrs) {
talloc_free(msc_data);
return NULL;
}
msc_data->msc_statg = osmo_stat_item_group_alloc(net, &msc_statg_desc, nr);
if (!msc_data->msc_statg) {
rate_ctr_group_free(msc_data->msc_ctrs);
talloc_free(msc_data);
return NULL;
}
llist_add_tail(&msc_data->entry, &net->bsc_data->mscs);
/* Init back pointer */
msc_data->network = net;
msc_data->core_plmn = (struct osmo_plmn_id){
.mcc = GSM_MCC_MNC_INVALID,
.mnc = GSM_MCC_MNC_INVALID,
};
msc_data->core_ci = -1;
msc_data->core_lac = -1;
msc_data->rtp_base = 4000;
msc_data->nr = nr;
msc_data->allow_emerg = 1;
msc_data->a.asp_proto = OSMO_SS7_ASP_PROT_M3UA;
/* Defaults for the audio setup */
msc_data->amr_conf.m5_90 = 1;
msc_data->amr_octet_aligned = true;
/* Allow the full set of possible codecs by default */
msc_data->audio_length = 5;
msc_data->audio_support =
talloc_zero_array(msc_data, struct gsm_audio_support *,
msc_data->audio_length);
for (i = 0; i < msc_data->audio_length; i++) {
msc_data->audio_support[i] =
talloc_zero(msc_data->audio_support,
struct gsm_audio_support);
}
msc_data->audio_support[0]->ver = 1;
msc_data->audio_support[0]->hr = 0;
msc_data->audio_support[1]->ver = 1;
msc_data->audio_support[1]->hr = 1;
msc_data->audio_support[2]->ver = 2;
msc_data->audio_support[2]->hr = 0;
msc_data->audio_support[3]->ver = 3;
msc_data->audio_support[3]->hr = 0;
msc_data->audio_support[4]->ver = 3;
msc_data->audio_support[4]->hr = 1;
osmo_fd_setup(&msc_data->mgcp_ipa.ofd, -1, BSC_FD_READ, &bsc_sccplite_mgcp_proxy_cb, msc_data, 0);
msc_data->mgcp_ipa.local_addr = talloc_strdup(msc_data, "0.0.0.0");
msc_data->mgcp_ipa.local_port = 0; /* dynamic */
return msc_data;
}
struct osmo_cell_global_id *cgi_for_msc(struct bsc_msc_data *msc, struct gsm_bts *bts)
{
static struct osmo_cell_global_id cgi;
cgi.lai.plmn = msc->network->plmn;
if (msc->core_plmn.mcc != GSM_MCC_MNC_INVALID)
cgi.lai.plmn.mcc = msc->core_plmn.mcc;
if (msc->core_plmn.mnc != GSM_MCC_MNC_INVALID) {
cgi.lai.plmn.mnc = msc->core_plmn.mnc;
cgi.lai.plmn.mnc_3_digits = msc->core_plmn.mnc_3_digits;
}
cgi.lai.lac = (msc->core_lac != -1) ? msc->core_lac : bts->location_area_code;
cgi.cell_identity = (msc->core_ci != -1) ? msc->core_ci : bts->cell_identity;
return &cgi;
}
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