gprs: Ignore NS RESET_ACK and ALIVE_ACK without RESET
Currently those messages are answered by a NS_STATUS message when
received on an uninitialised (no NS_RESET hat been seen yet) NS_VC
which violates GPP TS 08.16 7.3.1 and 7.4.1.
This patch adds checks to gprs_ns_vc_create() and eventually returns
before the error NS_STATUS message is generated.
Sponsored-by: On-Waves ehf
diff --git a/src/gb/gprs_ns.c b/src/gb/gprs_ns.c
index 0e9156a..55535ad 100644
--- a/src/gb/gprs_ns.c
+++ b/src/gb/gprs_ns.c
@@ -1127,12 +1127,29 @@
int rc;
if (nsh->pdu_type == NS_PDUT_STATUS) {
+ /* Do not respond, see 3GPP TS 08.16, 7.5.1 */
LOGP(DNS, LOGL_INFO, "Ignoring NS STATUS from %s "
"for non-existing NS-VC\n",
gprs_ns_ll_str(fallback_nsvc));
return GPRS_NS_CS_SKIPPED;
}
+ if (nsh->pdu_type == NS_PDUT_ALIVE_ACK) {
+ /* Ignore this, see 3GPP TS 08.16, 7.4.1 */
+ LOGP(DNS, LOGL_INFO, "Ignoring NS ALIVE ACK from %s "
+ "for non-existing NS-VC\n",
+ gprs_ns_ll_str(fallback_nsvc));
+ return GPRS_NS_CS_SKIPPED;
+ }
+
+ if (nsh->pdu_type == NS_PDUT_RESET_ACK) {
+ /* Ignore this, see 3GPP TS 08.16, 7.3.1 */
+ LOGP(DNS, LOGL_INFO, "Ignoring NS RESET ACK from %s "
+ "for non-existing NS-VC\n",
+ gprs_ns_ll_str(fallback_nsvc));
+ return GPRS_NS_CS_SKIPPED;
+ }
+
/* Only the RESET procedure creates a new NSVC */
if (nsh->pdu_type != NS_PDUT_RESET) {
/* Since we have no NSVC, we have to use a fake */
diff --git a/tests/gb/gprs_ns_test.ok b/tests/gb/gprs_ns_test.ok
index 23c9e5f..13d5f36 100644
--- a/tests/gb/gprs_ns_test.ok
+++ b/tests/gb/gprs_ns_test.ok
@@ -97,9 +97,6 @@
PROCESSING ALIVE_ACK from 0x01020304:1111
0b
-MESSAGE to BSS, msg length 7
-08 00 81 0a 02 81 0b
-
result (ALIVE_ACK) = 0
--- Send unexpected NS RESET ACK (should not be answered)---
@@ -107,9 +104,6 @@
PROCESSING RESET_ACK from 0x01020304:1111
03 01 82 e0 01 04 82 e0 00
-MESSAGE to BSS, msg length 15
-08 00 81 0a 02 89 03 01 82 e0 01 04 82 e0 00
-
result (RESET_ACK) = 0
--- Setup, send BSSGP RESET ---