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nat: Have a recycle timer that removes unconfirmed SCCP connections. 

The MSC does not respond to a SCCP CR with Paging Response as GSM
payload, when the response comes in 'too late'. Prevent the MUX having
stale connections and start removing old connections every 20 minutes.
This commit is contained in:
Holger Hans Peter Freyther 2010-06-15 18:51:56 +08:00
parent 886d382fea
commit 6b6ecba1a7
1 changed files with 32 additions and 0 deletions
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32
openbsc/src/nat/bsc_nat.c
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@ -50,11 +50,15 @@
#include <sccp/sccp.h>
#define SCCP_CLOSE_TIME 20
#define SCCP_CLOSE_TIME_TIMEOUT 19
struct log_target *stderr_target;
static const char *config_file = "bsc-nat.cfg";
static struct in_addr local_addr;
static struct bsc_fd bsc_listen;
static const char *msc_ip = NULL;
static struct timer_list sccp_close;
static struct bsc_nat *nat;
@ -904,6 +908,29 @@ static void signal_handler(int signal)
}
}
static void sccp_close_unconfirmed(void *_data)
{
struct sccp_connections *conn, *tmp1;
struct timespec now;
clock_gettime(CLOCK_MONOTONIC, &now);
llist_for_each_entry_safe(conn, tmp1, &nat->sccp_connections, list_entry) {
if (conn->has_remote_ref)
continue;
int diff = (now.tv_sec - conn->creation_time.tv_sec) / 60;
if (diff < SCCP_CLOSE_TIME_TIMEOUT)
continue;
LOGP(DNAT, LOGL_ERROR, "SCCP connection 0x%x/0x%x was never confirmed.\n",
sccp_src_ref_to_int(&conn->real_ref),
sccp_src_ref_to_int(&conn->patched_ref));
sccp_connection_destroy(conn);
}
bsc_schedule_timer(&sccp_close, SCCP_CLOSE_TIME, 0);
}
extern void *tall_msgb_ctx;
extern void *tall_ctr_ctx;
static void talloc_init_ctx()
@ -982,6 +1009,11 @@ int main(int argc, char** argv)
signal(SIGUSR1, &signal_handler);
signal(SIGPIPE, SIG_IGN);
/* recycle timer */
sccp_close.cb = sccp_close_unconfirmed;
sccp_close.data = NULL;
bsc_schedule_timer(&sccp_close, SCCP_CLOSE_TIME, 0);
while (1) {
bsc_select_main(0);
}