sit: fix panic with route cache in ip tunnels

Bug introduced by commit 7d442fab0a67 ("ipv4: Cache dst in tunnels").

Because sit code does not call ip_tunnel_init(), the dst_cache was not
initialized.

CC: Tom Herbert <therbert@google.com>
Signed-off-by: Nicolas Dichtel <nicolas.dichtel@6wind.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 4 insertions, 3 deletions

diff --git a/net/ipv4/ip_tunnel.c b/net/ipv4/ip_tunnel.c
index 08f8cf99b3a2..78a89e61925d 100644
--- a/net/ipv4/ip_tunnel.c
+++ b/net/ipv4/ip_tunnel.c
@@ -93,13 +93,14 @@ static void tunnel_dst_reset(struct ip_tunnel *t)
         tunnel_dst_set(t, NULL);
 }
 
-static void tunnel_dst_reset_all(struct ip_tunnel *t)
+void ip_tunnel_dst_reset_all(struct ip_tunnel *t)
 {
         int i;
 
         for_each_possible_cpu(i)
                 __tunnel_dst_set(per_cpu_ptr(t->dst_cache, i), NULL);
 }
+EXPORT_SYMBOL(ip_tunnel_dst_reset_all);
 
 static struct rtable *tunnel_rtable_get(struct ip_tunnel *t, u32 cookie)
 {
@@ -713,7 +714,7 @@ static void ip_tunnel_update(struct ip_tunnel_net *itn,
                 if (set_mtu)
                         dev->mtu = mtu;
         }
-        tunnel_dst_reset_all(t);
+        ip_tunnel_dst_reset_all(t);
         netdev_state_change(dev);
 }
 
@@ -1042,7 +1043,7 @@ void ip_tunnel_uninit(struct net_device *dev)
         if (itn->fb_tunnel_dev != dev)
                 ip_tunnel_del(netdev_priv(dev));
 
-        tunnel_dst_reset_all(tunnel);
+        ip_tunnel_dst_reset_all(tunnel);
 }
 EXPORT_SYMBOL_GPL(ip_tunnel_uninit);