[PATCH net,v3] vrf: check forwarding on the original netdevice when generating ICMP dest unreachable

[Stephen Suryaputra]

When ip_error() is called the device is the l3mdev master instead of the
original device. So the forwarding check should be on the original one.

Changes from v2:
- Handle the original device disappearing (per David Ahern)
- Minimize the change in code order

Changes from v1:
- Only need to reset the device on which __in_dev_get_rcu() is done (per
  David Ahern).

Signed-off-by: Stephen Suryaputra <ssuryae...@gmail.com>
---
 net/ipv4/route.c | 11 ++++++++++-
 1 file changed, 10 insertions(+), 1 deletion(-)

diff --git a/net/ipv4/route.c b/net/ipv4/route.c
index a4f44d8..9a29225 100644
--- a/net/ipv4/route.c
+++ b/net/ipv4/route.c
@@ -930,14 +930,23 @@ void ip_rt_send_redirect(struct sk_buff *skb)
 
 static int ip_error(struct sk_buff *skb)
 {
-       struct in_device *in_dev = __in_dev_get_rcu(skb->dev);
        struct rtable *rt = skb_rtable(skb);
+       struct net_device *dev = skb->dev;
+       struct in_device *in_dev;
        struct inet_peer *peer;
        unsigned long now;
        struct net *net;
        bool send;
        int code;
 
+       if (netif_is_l3_master(skb->dev)) {
+               dev = __dev_get_by_index(dev_net(skb->dev), IPCB(skb)->iif);
+               if (!dev)
+                       goto out;
+       }
+
+       in_dev = __in_dev_get_rcu(dev);
+
        /* IP on this device is disabled. */
        if (!in_dev)
                goto out;
-- 
2.7.4