child-sa: Introduce a CHILD_RETRYING state to detect DH group retries

src/libcharon/sa/child_sa.c

@@ -34,6 +34,7 @@ ENUM(child_sa_state_names, CHILD_CREATED, CHILD_DESTROYING,
 	"INSTALLED",
 	"UPDATING",
 	"REKEYING",
+	"RETRYING",
 	"DELETING",
 	"DESTROYING",
 );

src/libcharon/sa/child_sa.h

@@ -67,6 +67,11 @@ enum child_sa_state_t {
 	 */
 	CHILD_REKEYING,
 
+	/**
+	 * CHILD_SA negotiation failed, but gets retried
+	 */
+	CHILD_RETRYING,
+
 	/**
 	 * CHILD_SA in progress of delete
 	 */

src/libcharon/sa/ikev2/tasks/child_create.c

@@ -1408,6 +1408,7 @@ METHOD(task_t, process_i, status_t,
 						 this->dh_group, diffie_hellman_group_names, group);
 					this->retry = TRUE;
 					this->dh_group = group;
+					this->child_sa->set_state(this->child_sa, CHILD_RETRYING);
 					this->public.task.migrate(&this->public.task, this->ike_sa);
 					enumerator->destroy(enumerator);
 					return NEED_MORE;