libgtp: Use gtp_cause_successful() instead of GTPCAUSE_ACC_REQ

In some cases the phone requests a PDP context type that isn't available
no the PGW/GGSN, e.g. phone requests a combined IPv4/v6 context, but
only IPv4 is supported.

In that case the GGSN can send a Create PDP Context Response with cause
"New PDP type due to network preference" or "New PDP type due to single
address bearer only". libgtp should continue handling these cause values
like the "Request Accepted" cause. Use the new gtp_cause_successful()
function for that.

Related: OS#6268
Change-Id: I7dd1e0aa185530e1e2d0402742df833c61a787a7

1 files changed, 7 insertions, 8 deletions

diff --git a/gtp/gtp.c b/gtp/gtp.c
index 1ebc6dc..43e56b5 100644
--- a/gtp/gtp.c
+++ b/gtp/gtp.c
@@ -995,7 +995,7 @@ int gtp_create_context_resp(struct gsn_t *gsn, struct pdp_t *pdp, int cause)
 	/* Now send off a reply to the peer */
 	gtp_create_pdp_resp(gsn, pdp->version, pdp, cause);
 
-	if (cause != GTPCAUSE_ACC_REQ)
+	if (!gtp_cause_successful(cause))
 		gtp_freepdp(gsn, pdp);
 
 	return 0;
@@ -1011,7 +1011,7 @@ int gtp_create_pdp_resp(struct gsn_t *gsn, int version, struct pdp_t *pdp,
 
 	gtpie_tv1(&packet, &length, GTP_MAX, GTPIE_CAUSE, cause);
 
-	if (cause == GTPCAUSE_ACC_REQ) {
+	if (gtp_cause_successful(cause)) {
 
 		if (version == 0)
 			gtpie_tv0(&packet, &length, GTP_MAX, GTPIE_QOS_PROFILE0,
@@ -1445,7 +1445,7 @@ int gtp_create_pdp_conf(struct gsn_t *gsn, int version,
 	}
 
 	/* Check all conditional information elements */
-	if (GTPCAUSE_ACC_REQ == cause) {
+	if (gtp_cause_successful(cause)) {
 
 		if (version == 0) {
 			if (gtpie_gettv0(ie, GTPIE_QOS_PROFILE0, 0,
@@ -1667,7 +1667,7 @@ static int gtp_update_pdp_resp(struct gsn_t *gsn, uint8_t version,
 
 	gtpie_tv1(&packet, &length, GTP_MAX, GTPIE_CAUSE, cause);
 
-	if (cause == GTPCAUSE_ACC_REQ) {
+	if (gtp_cause_successful(cause)) {
 
 		if (version == 0)
 			gtpie_tv0(&packet, &length, GTP_MAX, GTPIE_QOS_PROFILE0,
@@ -1997,7 +1997,7 @@ static int gtp_update_pdp_conf(struct gsn_t *gsn, uint8_t version,
 
 	/* Check all conditional information elements */
 	/* TODO: This does not handle GGSN-initiated update responses */
-	if (cause == GTPCAUSE_ACC_REQ) {
+	if (gtp_cause_successful(cause)) {
 		if (version == 0) {
 			if (gtpie_gettv0(ie, GTPIE_QOS_PROFILE0, 0,
 					 &pdp->qos_neg0,
@@ -2172,7 +2172,7 @@ int gtp_delete_pdp_resp(struct gsn_t *gsn, int version,
 	gtp_resp(version, gsn, pdp, &packet, length, peer, fd,
 		 get_seq(pack), get_tid(pack));
 
-	if (cause == GTPCAUSE_ACC_REQ) {
+	if (gtp_cause_successful(cause)) {
 		if ((teardown) || (version == 0)) {	/* Remove all contexts */
 			gtp_freepdp_teardown(gsn, linked_pdp);
 		} else {
@@ -2198,7 +2198,6 @@ int gtp_delete_pdp_resp(struct gsn_t *gsn, int version,
 			}
 		}
 	}
-	/* if (cause == GTPCAUSE_ACC_REQ) */
 	return 0;
 }
 
@@ -2350,7 +2349,7 @@ int gtp_delete_pdp_conf(struct gsn_t *gsn, int version,
 	}
 
 	/* Check the cause value (again) */
-	if ((GTPCAUSE_ACC_REQ != cause) && (GTPCAUSE_NON_EXIST != cause)) {
+	if (!gtp_cause_successful(cause) && (GTPCAUSE_NON_EXIST != cause)) {
 		rate_ctr_inc2(gsn->ctrg, GSN_CTR_ERR_UNEXPECTED_CAUSE);
 		GTP_LOGPKG(LOGL_ERROR, peer, pack, len,
 			    "Unexpected cause value received: %d\n", cause);