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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.
This commit is contained in:
Holger Hans Peter Freyther 2010-05-02 19:28:59 +08:00
parent 314191d75a
commit 906c15ec53
2 changed files with 59 additions and 0 deletions
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4
openbsc/include/openbsc/bsc_nat.h
View File

@ -93,6 +93,10 @@ struct bsc_connection {
/* 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;
};

55
openbsc/src/nat/bsc_nat.c
View File

@ -108,6 +108,46 @@ static void send_reset_ack(struct bsc_connection *bsc)
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 @@ void bsc_close_connection(struct bsc_connection *connection)
/* 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 @@ static void ipaccess_auth_bsc(struct tlv_parsed *tvp, struct bsc_connection *bsc
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 @@ static int ipaccess_bsc_read_cb(struct bsc_fd *bfd)
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);