diff --git a/Documentation/networking/ip-sysctl.txt b/Documentation/networking/ip-sysctl.txt
index 960de8fe3f40..163b5ff1073c 100644
--- a/Documentation/networking/ip-sysctl.txt
+++ b/Documentation/networking/ip-sysctl.txt
@@ -1442,6 +1442,14 @@ max_hbh_length - INTEGER
 	header.
 	Default: INT_MAX (unlimited)
 
+skip_notify_on_dev_down - BOOLEAN
+	Controls whether an RTM_DELROUTE message is generated for routes
+	removed when a device is taken down or deleted. IPv4 does not
+	generate this message; IPv6 does by default. Setting this sysctl
+	to true skips the message, making IPv4 and IPv6 on par in relying
+	on userspace caches to track link events and evict routes.
+	Default: false (generate message)
+
 IPv6 Fragmentation:
 
 ip6frag_high_thresh - INTEGER
diff --git a/include/net/ip6_fib.h b/include/net/ip6_fib.h
index f06e968f1992..caabfd84a098 100644
--- a/include/net/ip6_fib.h
+++ b/include/net/ip6_fib.h
@@ -407,6 +407,9 @@ struct fib6_node *fib6_locate(struct fib6_node *root,
 
 void fib6_clean_all(struct net *net, int (*func)(struct fib6_info *, void *arg),
 		    void *arg);
+void fib6_clean_all_skip_notify(struct net *net,
+				int (*func)(struct fib6_info *, void *arg),
+				void *arg);
 
 int fib6_add(struct fib6_node *root, struct fib6_info *rt,
 	     struct nl_info *info, struct netlink_ext_ack *extack);
diff --git a/include/net/netns/ipv6.h b/include/net/netns/ipv6.h
index f0e396ab9bec..ef1ed529f33c 100644
--- a/include/net/netns/ipv6.h
+++ b/include/net/netns/ipv6.h
@@ -45,6 +45,7 @@ struct netns_sysctl_ipv6 {
 	int max_dst_opts_len;
 	int max_hbh_opts_len;
 	int seg6_flowlabel;
+	bool skip_notify_on_dev_down;
 };
 
 struct netns_ipv6 {
diff --git a/net/ipv6/ip6_fib.c b/net/ipv6/ip6_fib.c
index e14d244c551f..9ba72d94d60f 100644
--- a/net/ipv6/ip6_fib.c
+++ b/net/ipv6/ip6_fib.c
@@ -47,6 +47,7 @@ struct fib6_cleaner {
 	int (*func)(struct fib6_info *, void *arg);
 	int sernum;
 	void *arg;
+	bool skip_notify;
 };
 
 #ifdef CONFIG_IPV6_SUBTREES
@@ -1956,6 +1957,7 @@ static int fib6_clean_node(struct fib6_walker *w)
 	struct fib6_cleaner *c = container_of(w, struct fib6_cleaner, w);
 	struct nl_info info = {
 		.nl_net = c->net,
+		.skip_notify = c->skip_notify,
 	};
 
 	if (c->sernum != FIB6_NO_SERNUM_CHANGE &&
@@ -2007,7 +2009,7 @@ static int fib6_clean_node(struct fib6_walker *w)
 
 static void fib6_clean_tree(struct net *net, struct fib6_node *root,
 			    int (*func)(struct fib6_info *, void *arg),
-			    int sernum, void *arg)
+			    int sernum, void *arg, bool skip_notify)
 {
 	struct fib6_cleaner c;
 
@@ -2019,13 +2021,14 @@ static void fib6_clean_tree(struct net *net, struct fib6_node *root,
 	c.sernum = sernum;
 	c.arg = arg;
 	c.net = net;
+	c.skip_notify = skip_notify;
 
 	fib6_walk(net, &c.w);
 }
 
 static void __fib6_clean_all(struct net *net,
 			     int (*func)(struct fib6_info *, void *),
-			     int sernum, void *arg)
+			     int sernum, void *arg, bool skip_notify)
 {
 	struct fib6_table *table;
 	struct hlist_head *head;
@@ -2037,7 +2040,7 @@ static void __fib6_clean_all(struct net *net,
 		hlist_for_each_entry_rcu(table, head, tb6_hlist) {
 			spin_lock_bh(&table->tb6_lock);
 			fib6_clean_tree(net, &table->tb6_root,
-					func, sernum, arg);
+					func, sernum, arg, skip_notify);
 			spin_unlock_bh(&table->tb6_lock);
 		}
 	}
@@ -2047,14 +2050,21 @@ static void __fib6_clean_all(struct net *net,
 void fib6_clean_all(struct net *net, int (*func)(struct fib6_info *, void *),
 		    void *arg)
 {
-	__fib6_clean_all(net, func, FIB6_NO_SERNUM_CHANGE, arg);
+	__fib6_clean_all(net, func, FIB6_NO_SERNUM_CHANGE, arg, false);
+}
+
+void fib6_clean_all_skip_notify(struct net *net,
+				int (*func)(struct fib6_info *, void *),
+				void *arg)
+{
+	__fib6_clean_all(net, func, FIB6_NO_SERNUM_CHANGE, arg, true);
 }
 
 static void fib6_flush_trees(struct net *net)
 {
 	int new_sernum = fib6_new_sernum(net);
 
-	__fib6_clean_all(net, NULL, new_sernum, NULL);
+	__fib6_clean_all(net, NULL, new_sernum, NULL, false);
 }
 
 /*
diff --git a/net/ipv6/route.c b/net/ipv6/route.c
index bf4cd647d8b8..f4e08b0689a8 100644
--- a/net/ipv6/route.c
+++ b/net/ipv6/route.c
@@ -4026,8 +4026,12 @@ void rt6_sync_down_dev(struct net_device *dev, unsigned long event)
 			.event = event,
 		},
 	};
+	struct net *net = dev_net(dev);
 
-	fib6_clean_all(dev_net(dev), fib6_ifdown, &arg);
+	if (net->ipv6.sysctl.skip_notify_on_dev_down)
+		fib6_clean_all_skip_notify(net, fib6_ifdown, &arg);
+	else
+		fib6_clean_all(net, fib6_ifdown, &arg);
 }
 
 void rt6_disable_ip(struct net_device *dev, unsigned long event)
@@ -5031,6 +5035,9 @@ int ipv6_sysctl_rtcache_flush(struct ctl_table *ctl, int write,
 	return 0;
 }
 
+static int zero;
+static int one = 1;
+
 static struct ctl_table ipv6_route_table_template[] = {
 	{
 		.procname	=	"flush",
@@ -5102,6 +5109,15 @@ static struct ctl_table ipv6_route_table_template[] = {
 		.mode		=	0644,
 		.proc_handler	=	proc_dointvec_ms_jiffies,
 	},
+	{
+		.procname	=	"skip_notify_on_dev_down",
+		.data		=	&init_net.ipv6.sysctl.skip_notify_on_dev_down,
+		.maxlen		=	sizeof(int),
+		.mode		=	0644,
+		.proc_handler	=	proc_dointvec,
+		.extra1		=	&zero,
+		.extra2		=	&one,
+	},
 	{ }
 };
 
@@ -5125,6 +5141,7 @@ struct ctl_table * __net_init ipv6_route_sysctl_init(struct net *net)
 		table[7].data = &net->ipv6.sysctl.ip6_rt_mtu_expires;
 		table[8].data = &net->ipv6.sysctl.ip6_rt_min_advmss;
 		table[9].data = &net->ipv6.sysctl.ip6_rt_gc_min_interval;
+		table[10].data = &net->ipv6.sysctl.skip_notify_on_dev_down;
 
 		/* Don't export sysctls to unprivileged users */
 		if (net->user_ns != &init_user_ns)
@@ -5189,6 +5206,7 @@ static int __net_init ip6_route_net_init(struct net *net)
 	net->ipv6.sysctl.ip6_rt_gc_elasticity = 9;
 	net->ipv6.sysctl.ip6_rt_mtu_expires = 10*60*HZ;
 	net->ipv6.sysctl.ip6_rt_min_advmss = IPV6_MIN_MTU - 20 - 40;
+	net->ipv6.sysctl.skip_notify_on_dev_down = 0;
 
 	net->ipv6.ip6_rt_gc_expire = 30*HZ;