ike-sa: Add limit for the number of redirects within a defined time period

src/libcharon/sa/ike_sa.h

@@ -65,6 +65,16 @@ typedef struct ike_sa_t ike_sa_t;
  */
 #define RETRY_JITTER 20
 
+/**
+ * Number of redirects allowed within REDIRECT_LOOP_DETECT_PERIOD.
+ */
+#define MAX_REDIRECTS 5
+
+/**
+ * Time period in seconds in which at most MAX_REDIRECTS are allowed.
+ */
+#define REDIRECT_LOOP_DETECT_PERIOD 300
+
 /**
  * Extensions (or optional features) the peer supports
  */