Add get_ip_filter() to session

docs/manual.rst

@@ -184,7 +184,8 @@ The ``session`` class has the following synopsis::
 		entry state() const;
 
 		void set_ip_filter(ip_filter const& f);
-      
+		ip_filter const& get_ip_filter() const;
+
 		session_status status() const;
 		cache_status get_cache_status() const;
 
@@ -628,6 +629,14 @@ accepted and not, see ip_filter_.
 Each time a peer is blocked because of the IP filter, a peer_blocked_alert_ is
 generated.
 
+get_ip_filter()
+---------------
+
+	::
+		ip_filter const& get_ip_filter() const;
+		
+Returns the ip_filter currently in the session. See ip_filter_.
+
 
 status()
 --------