SS/USSD: make NCSS session timeout configurable
It may happen that either the MS or an ESME would become
unresponsive, e.g. due to a bug, or a dropped message.
This is why we have SS session timeout, that prevents
keeping 'stalled' sessions forever.
Let's introduce a VTY option, which can be used to configure
this timer (by default it's set to 30 seconds):
hlr
...
! Use 0 to disable this timer
ncss-guard-timeout 30
Change-Id: I971fc2cee6fd46d4d5d6dac6c634e0b22fff183d
Related: OS#3717
diff --git a/src/hlr.c b/src/hlr.c
index 14945b6..4873a66 100644
--- a/src/hlr.c
+++ b/src/hlr.c
@@ -611,6 +611,9 @@
INIT_LLIST_HEAD(&g_hlr->ss_sessions);
INIT_LLIST_HEAD(&g_hlr->ussd_routes);
+ /* Init default (call independent) SS session guard timeout value */
+ g_hlr->ncss_guard_timeout = NCSS_GUARD_TIMEOUT_DEFAULT;
+
rc = osmo_init_logging2(hlr_ctx, &hlr_log_info);
if (rc < 0) {
fprintf(stderr, "Error initializing logging\n");
diff --git a/src/hlr.h b/src/hlr.h
index 315c3dd..e9cc747 100644
--- a/src/hlr.h
+++ b/src/hlr.h
@@ -45,6 +45,9 @@
struct hlr_euse *euse_default;
struct llist_head iuse_list;
+ /* NCSS (call independent) session guard timeout value */
+ int ncss_guard_timeout;
+
struct llist_head ussd_routes;
struct llist_head ss_sessions;
diff --git a/src/hlr_ussd.c b/src/hlr_ussd.c
index b7aaba4..16a197c 100644
--- a/src/hlr_ussd.c
+++ b/src/hlr_ussd.c
@@ -209,10 +209,11 @@
OSMO_STRLCPY_ARRAY(ss->imsi, imsi);
ss->session_id = session_id;
osmo_timer_setup(&ss->timeout, ss_session_timeout, ss);
- /* NOTE: The timeout is currently global and not refreshed with subsequent messages
- * within the SS/USSD session. So 30s after the initial SS message, the session will
- * timeout! */
- osmo_timer_schedule(&ss->timeout, 30, 0);
+ /* NOTE: The timeout is currently not refreshed with subsequent messages
+ * within the SS/USSD session. So X seconds after the initial SS message,
+ * the session will timeout! */
+ if (g_hlr->ncss_guard_timeout > 0)
+ osmo_timer_schedule(&ss->timeout, g_hlr->ncss_guard_timeout, 0);
llist_add_tail(&ss->list, &hlr->ss_sessions);
return ss;
diff --git a/src/hlr_ussd.h b/src/hlr_ussd.h
index 0414924..393ca6c 100644
--- a/src/hlr_ussd.h
+++ b/src/hlr_ussd.h
@@ -7,6 +7,8 @@
#include "gsup_server.h"
+#define NCSS_GUARD_TIMEOUT_DEFAULT 30
+
struct hlr_ussd_route {
/* g_hlr.routes */
struct llist_head list;
diff --git a/src/hlr_vty.c b/src/hlr_vty.c
index 2d9b929..6706aa4 100644
--- a/src/hlr_vty.c
+++ b/src/hlr_vty.c
@@ -35,6 +35,7 @@
#include "hlr.h"
#include "hlr_vty.h"
#include "hlr_vty_subscr.h"
+#include "hlr_ussd.h"
#include "gsup_server.h"
struct cmd_node hlr_node = {
@@ -288,9 +289,22 @@
if (g_hlr->euse_default)
vty_out(vty, " ussd default-route external %s%s", g_hlr->euse_default->name, VTY_NEWLINE);
+ if (g_hlr->ncss_guard_timeout != NCSS_GUARD_TIMEOUT_DEFAULT)
+ vty_out(vty, " ncss-guard-timeout %i%s",
+ g_hlr->ncss_guard_timeout, VTY_NEWLINE);
+
return 0;
}
+DEFUN(cfg_ncss_guard_timeout, cfg_ncss_guard_timeout_cmd,
+ "ncss-guard-timeout <0-255>",
+ "Set guard timer for NCSS (call independent SS) session activity\n"
+ "Guard timer value (sec.), or 0 to disable")
+{
+ g_hlr->ncss_guard_timeout = atoi(argv[0]);
+ return CMD_SUCCESS;
+}
+
/***********************************************************************
* Common Code
***********************************************************************/
@@ -353,6 +367,7 @@
install_element(HLR_NODE, &cfg_ussd_no_route_pfx_cmd);
install_element(HLR_NODE, &cfg_ussd_defaultroute_cmd);
install_element(HLR_NODE, &cfg_ussd_no_defaultroute_cmd);
+ install_element(HLR_NODE, &cfg_ncss_guard_timeout_cmd);
hlr_vty_subscriber_init();
}