nat: Send a IPA PING down the stream and wait for the pong.
We will send a ping every 20 seconds and if we have no pong
within 5 seconds we will close down the BSC connection and
wait for a reconnect. We will start this after having
authenticated the BSC and we stop the timer when destructing
the BSC connection.
diff --git a/openbsc/include/openbsc/bsc_nat.h b/openbsc/include/openbsc/bsc_nat.h
index 28ed4e8..d72e3b4 100644
--- a/openbsc/include/openbsc/bsc_nat.h
+++ b/openbsc/include/openbsc/bsc_nat.h
@@ -93,6 +93,10 @@
/* a timeout node */
struct timer_list id_timeout;
+ /* pong timeout */
+ struct timer_list ping_timeout;
+ struct timer_list pong_timeout;
+
/* a back pointer */
struct bsc_nat *nat;
};
diff --git a/openbsc/src/nat/bsc_nat.c b/openbsc/src/nat/bsc_nat.c
index 121b2bb..4a8fca7 100644
--- a/openbsc/src/nat/bsc_nat.c
+++ b/openbsc/src/nat/bsc_nat.c
@@ -108,6 +108,46 @@
bsc_send_data(bsc, gsm_reset_ack, sizeof(gsm_reset_ack), IPAC_PROTO_SCCP);
}
+static void send_ping(struct bsc_connection *bsc)
+{
+ static const u_int8_t id_ping[] = {
+ IPAC_MSGT_PING,
+ };
+
+ bsc_send_data(bsc, id_ping, sizeof(id_ping), IPAC_PROTO_IPACCESS);
+}
+
+static void bsc_pong_timeout(void *_bsc)
+{
+ struct bsc_connection *bsc = _bsc;
+
+ LOGP(DNAT, LOGL_ERROR, "BSC Nr: %d PONG timeout.\n", bsc->cfg->nr);
+ bsc_close_connection(bsc);
+}
+
+static void bsc_ping_timeout(void *_bsc)
+{
+ struct bsc_connection *bsc = _bsc;
+
+ send_ping(bsc);
+
+ /* send another ping in 20 seconds */
+ bsc_schedule_timer(&bsc->ping_timeout, 20, 0);
+
+ /* also start a pong timer */
+ bsc_schedule_timer(&bsc->pong_timeout, 5, 0);
+}
+
+static void start_ping_pong(struct bsc_connection *bsc)
+{
+ bsc->pong_timeout.data = bsc;
+ bsc->pong_timeout.cb = bsc_pong_timeout;
+ bsc->ping_timeout.data = bsc;
+ bsc->ping_timeout.cb = bsc_ping_timeout;
+
+ bsc_ping_timeout(bsc);
+}
+
static void send_id_ack(struct bsc_connection *bsc)
{
static const u_int8_t id_ack[] = {
@@ -437,6 +477,8 @@
/* stop the timeout timer */
bsc_del_timer(&connection->id_timeout);
+ bsc_del_timer(&connection->ping_timeout);
+ bsc_del_timer(&connection->pong_timeout);
/* remove all SCCP connections */
llist_for_each_entry_safe(sccp_patch, tmp, &nat->sccp_connections, list_entry) {
@@ -490,6 +532,7 @@
bsc->cfg = conf;
bsc_del_timer(&bsc->id_timeout);
LOGP(DNAT, LOGL_NOTICE, "Authenticated bsc nr: %d lac: %d\n", conf->nr, conf->lac);
+ start_ping_pong(bsc);
return;
}
}
@@ -622,6 +665,18 @@
LOGP(DNAT, LOGL_DEBUG, "MSG from BSC: %s proto: %d\n", hexdump(msg->data, msg->len), msg->l2h[0]);
/* Handle messages from the BSC */
+ if (bsc->authenticated) {
+ struct ipaccess_head *hh;
+ hh = (struct ipaccess_head *) msg->data;
+
+ /* stop the pong timeout */
+ if (hh->proto == IPAC_PROTO_IPACCESS && msg->l2h[0] == IPAC_MSGT_PONG) {
+ bsc_del_timer(&bsc->pong_timeout);
+ msgb_free(msg);
+ return 0;
+ }
+ }
+
/* FIXME: Currently no PONG is sent to the BSC */
/* FIXME: Currently no ID ACK is sent to the BSC */
forward_sccp_to_msc(bsc, msg);