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osmo-bsc: react on reset requests from MSC 

The bsc side currently can not receive reset commands from an
MSC. This patch adds required functionality to receive a reset
command and acknowlege it properly. The effects are the same
as with when sending resets (all drop all ongoing calls and
sccp connections)

Change-Id: I44c7e54c845948c54614b36d97d2ba1e760ac46b
This commit is contained in:
Philipp Maier 2017-06-12 19:09:43 +02:00 committed by Neels Hofmeyr
parent fef5ee84f2
commit 34ed929877
3 changed files with 49 additions and 5 deletions
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6
include/openbsc/osmo_bsc_sigtran.h
View File

@ -40,3 +40,9 @@ int osmo_bsc_sigtran_del_conn(struct osmo_bsc_sccp_con *sccp);
/* Initalize osmo sigtran backhaul */
int osmo_bsc_sigtran_init(struct llist_head *mscs);
/* Close all open sigtran connections and channels */
void osmo_bsc_sigtran_reset(struct bsc_msc_data *msc);
/* Send reset-ack to MSC */
void osmo_bsc_sigtran_tx_reset_ack(struct bsc_msc_data *msc);

21
src/osmo-bsc/osmo_bsc_bssap.c
View File

@ -203,6 +203,24 @@ static int bssmap_handle_reset_ack(struct bsc_msc_data *msc,
return 0;
}
/* Handle MSC sided reset */
static int bssmap_handle_reset(struct bsc_msc_data *msc,
struct msgb *msg, unsigned int length)
{
LOGP(DMSC, LOGL_NOTICE, "Reset from MSC No.: %i\n", msc->nr);
/* Instruct the bsc to close all open sigtran connections and to
* close all active channels on the BTS side as well */
osmo_bsc_sigtran_reset(msc);
/* Inform the MSC that we have received the reset request and
* that we acted accordingly */
osmo_bsc_sigtran_tx_reset_ack(msc);
return 0;
}
/* GSM 08.08 § 3.2.1.19 */
static int bssmap_handle_paging(struct bsc_msc_data *msc,
struct msgb *msg, unsigned int payload_length)
@ -553,6 +571,9 @@ static int bssmap_rcvmsg_udt(struct bsc_msc_data *msc,
case BSS_MAP_MSG_RESET_ACKNOWLEDGE:
ret = bssmap_handle_reset_ack(msc, msg, length);
break;
case BSS_MAP_MSG_RESET:
ret = bssmap_handle_reset(msc, msg, length);
break;
case BSS_MAP_MSG_PAGING:
ret = bssmap_handle_paging(msc, msg, length);
break;

27
src/osmo-bsc/osmo_bsc_sigtran.c
View File

@ -85,6 +85,17 @@ static void osmo_bsc_sigtran_tx_reset(struct bsc_msc_data *msc)
&msc->msc_con->g_called_addr, msg);
}
/* Send reset-ack to MSC */
void osmo_bsc_sigtran_tx_reset_ack(struct bsc_msc_data *msc)
{
struct msgb *msg;
LOGP(DMSC, LOGL_NOTICE, "Sending RESET RACK to MSC No.: %i\n", msc->nr);
msg = gsm0808_create_reset_ack();
osmo_sccp_tx_unitdata_msg(msc->msc_con->sccp_user, &msc->msc_con->g_calling_addr,
&msc->msc_con->g_called_addr, msg);
}
/* Find an MSC by its sigtran point code */
static struct bsc_msc_data *get_msc_by_addr(struct osmo_sccp_addr *calling_addr)
{
@ -347,14 +358,11 @@ static void bsc_notify_msc_lost(struct osmo_bsc_sccp_con *con)
bsc_send_ussd_release_complete(conn);
}
/* Callback function: Close all open connections */
static void osmo_bsc_sigtran_reset_cb(void *priv)
/* Close all open sigtran connections and channels */
void osmo_bsc_sigtran_reset(struct bsc_msc_data *msc)
{
struct osmo_bsc_sccp_con *conn;
struct osmo_bsc_sccp_con *conn_temp;
struct bsc_msc_data *msc = (struct bsc_msc_data*) priv;
OSMO_ASSERT(msc);
/* Close all open connections */
@ -365,6 +373,15 @@ static void osmo_bsc_sigtran_reset_cb(void *priv)
osmo_bsc_sigtran_del_conn(conn);
}
msc->msc_con->conn_id_counter = 0;
}
/* Callback function: Close all open connections */
static void osmo_bsc_sigtran_reset_cb(void *priv)
{
struct bsc_msc_data *msc = (struct bsc_msc_data*) priv;
/* Shut down all ongoint traffic */
osmo_bsc_sigtran_reset(msc);
/* Send reset to MSC */
osmo_bsc_sigtran_tx_reset(msc);