diff --git a/include/net/fib_rules.h b/include/net/fib_rules.h
index 08bab8b..ed3a887 100644
--- a/include/net/fib_rules.h
+++ b/include/net/fib_rules.h
@@ -59,6 +59,10 @@
 	u32			(*default_pref)(void);
 	size_t			(*nlmsg_payload)(struct fib_rule *);
 
+	/* Called after modifications to the rules set, must flush
+	 * the route cache if one exists. */
+	void			(*flush_cache)(void);
+
 	int			nlgroup;
 	struct nla_policy	*policy;
 	struct list_head	*rules_list;
diff --git a/net/core/fib_rules.c b/net/core/fib_rules.c
index 5824b26..cb2dae1 100644
--- a/net/core/fib_rules.c
+++ b/net/core/fib_rules.c
@@ -44,6 +44,12 @@
 		module_put(ops->owner);
 }
 
+static void flush_route_cache(struct fib_rules_ops *ops)
+{
+	if (ops->flush_cache)
+		ops->flush_cache();
+}
+
 int fib_rules_register(struct fib_rules_ops *ops)
 {
 	int err = -EEXIST;
@@ -314,6 +320,7 @@
 		list_add_rcu(&rule->list, ops->rules_list);
 
 	notify_rule_change(RTM_NEWRULE, rule, ops, nlh, NETLINK_CB(skb).pid);
+	flush_route_cache(ops);
 	rules_ops_put(ops);
 	return 0;
 
@@ -404,6 +411,7 @@
 		notify_rule_change(RTM_DELRULE, rule, ops, nlh,
 				   NETLINK_CB(skb).pid);
 		fib_rule_put(rule);
+		flush_route_cache(ops);
 		rules_ops_put(ops);
 		return 0;
 	}
diff --git a/net/decnet/dn_rules.c b/net/decnet/dn_rules.c
index fd0cc2a..7f58b95 100644
--- a/net/decnet/dn_rules.c
+++ b/net/decnet/dn_rules.c
@@ -31,6 +31,7 @@
 #include <net/dn_fib.h>
 #include <net/dn_neigh.h>
 #include <net/dn_dev.h>
+#include <net/dn_route.h>
 
 static struct fib_rules_ops dn_fib_rules_ops;
 
@@ -239,6 +240,11 @@
 	return 0;
 }
 
+static void dn_fib_rule_flush_cache(void)
+{
+	dn_rt_cache_flush(0);
+}
+
 static struct fib_rules_ops dn_fib_rules_ops = {
 	.family		= AF_DECnet,
 	.rule_size	= sizeof(struct dn_fib_rule),
@@ -249,6 +255,7 @@
 	.compare	= dn_fib_rule_compare,
 	.fill		= dn_fib_rule_fill,
 	.default_pref	= dn_fib_rule_default_pref,
+	.flush_cache	= dn_fib_rule_flush_cache,
 	.nlgroup	= RTNLGRP_DECnet_RULE,
 	.policy		= dn_fib_rule_policy,
 	.rules_list	= &dn_fib_rules,
diff --git a/net/ipv4/fib_rules.c b/net/ipv4/fib_rules.c
index b021b34..fe29b98 100644
--- a/net/ipv4/fib_rules.c
+++ b/net/ipv4/fib_rules.c
@@ -298,6 +298,11 @@
 	       + nla_total_size(4); /* flow */
 }
 
+static void fib4_rule_flush_cache(void)
+{
+	rt_cache_flush(0);
+}
+
 static struct fib_rules_ops fib4_rules_ops = {
 	.family		= AF_INET,
 	.rule_size	= sizeof(struct fib4_rule),
@@ -309,6 +314,7 @@
 	.fill		= fib4_rule_fill,
 	.default_pref	= fib4_rule_default_pref,
 	.nlmsg_payload	= fib4_rule_nlmsg_payload,
+	.flush_cache	= fib4_rule_flush_cache,
 	.nlgroup	= RTNLGRP_IPV4_RULE,
 	.policy		= fib4_rule_policy,
 	.rules_list	= &fib4_rules,