Revert "net: maintain namespace isolation between vlan and real device"

This reverts commit 8a83a00b0735190384a348156837918271034144.

It causes regressions for S390 devices, because it does an
unconditional DST drop on SKBs for vlans and the QETH device
needs the neighbour entry hung off the DST for certain things
on transmit.

Arnd can't remember exactly why he even needed this change.

Conflicts:

	drivers/net/macvlan.c
	net/8021q/vlan_dev.c
	net/core/dev.c

Signed-off-by: David S. Miller <davem@davemloft.net>

2 files changed, 6 insertions, 32 deletions

diff --git a/net/8021q/vlan_dev.c b/net/8021q/vlan_dev.c
index 9988d4abb372..9757c193c86b 100644
--- a/net/8021q/vlan_dev.c
+++ b/net/8021q/vlan_dev.c
@@ -157,7 +157,7 @@ static netdev_tx_t vlan_dev_hard_start_xmit(struct sk_buff *skb,
                 skb = __vlan_hwaccel_put_tag(skb, vlan_tci);
         }
 
-        skb_set_dev(skb, vlan_dev_priv(dev)->real_dev);
+        skb->dev = vlan_dev_priv(dev)->real_dev;
         len = skb->len;
         if (netpoll_tx_running(dev))
                 return skb->dev->netdev_ops->ndo_start_xmit(skb, skb->dev);
diff --git a/net/core/dev.c b/net/core/dev.c
index 9bb8f87c4cda..99e1d759f41e 100644
--- a/net/core/dev.c
+++ b/net/core/dev.c
@@ -1617,10 +1617,14 @@ int dev_forward_skb(struct net_device *dev, struct sk_buff *skb)
                 return NET_RX_DROP;
         }
         skb->skb_iif = 0;
-        skb_set_dev(skb, dev);
+        skb->dev = dev;
+        skb_dst_drop(skb);
         skb->tstamp.tv64 = 0;
         skb->pkt_type = PACKET_HOST;
         skb->protocol = eth_type_trans(skb, dev);
+        skb->mark = 0;
+        secpath_reset(skb);
+        nf_reset(skb);
         return netif_rx(skb);
 }
 EXPORT_SYMBOL_GPL(dev_forward_skb);
@@ -1869,36 +1873,6 @@ void netif_device_attach(struct net_device *dev)
 }
 EXPORT_SYMBOL(netif_device_attach);
 
-/**
- * skb_dev_set -- assign a new device to a buffer
- * @skb: buffer for the new device
- * @dev: network device
- *
- * If an skb is owned by a device already, we have to reset
- * all data private to the namespace a device belongs to
- * before assigning it a new device.
- */
-#ifdef CONFIG_NET_NS
-void skb_set_dev(struct sk_buff *skb, struct net_device *dev)
-{
-        skb_dst_drop(skb);
-        if (skb->dev && !net_eq(dev_net(skb->dev), dev_net(dev))) {
-                secpath_reset(skb);
-                nf_reset(skb);
-                skb_init_secmark(skb);
-                skb->mark = 0;
-                skb->priority = 0;
-                skb->nf_trace = 0;
-                skb->ipvs_property = 0;
-#ifdef CONFIG_NET_SCHED
-                skb->tc_index = 0;
-#endif
-        }
-        skb->dev = dev;
-}
-EXPORT_SYMBOL(skb_set_dev);
-#endif /* CONFIG_NET_NS */
-
 static void skb_warn_bad_offload(const struct sk_buff *skb)
 {
         static const netdev_features_t null_features = 0;