1 files changed, 6 insertions, 0 deletions

diff --git a/net/ipv4/route.c b/net/ipv4/route.c
index 351dc4e85242..788a3e74834e 100644
--- a/net/ipv4/route.c
+++ b/net/ipv4/route.c
@@ -2707,6 +2707,11 @@ static struct dst_entry *ipv4_blackhole_dst_check(struct dst_entry *dst, u32 coo
         return NULL;
 }
 
+static unsigned int ipv4_blackhole_default_mtu(const struct dst_entry *dst)
+{
+        return 0;
+}
+
 static void ipv4_rt_blackhole_update_pmtu(struct dst_entry *dst, u32 mtu)
 {
 }
@@ -2716,6 +2721,7 @@ static struct dst_ops ipv4_dst_blackhole_ops = {
         .protocol               =       cpu_to_be16(ETH_P_IP),
         .destroy                =       ipv4_dst_destroy,
         .check                  =       ipv4_blackhole_dst_check,
+        .default_mtu            =       ipv4_blackhole_default_mtu,
         .update_pmtu            =       ipv4_rt_blackhole_update_pmtu,
 };