net: Validate xmit SKBs right when we pull them out of the qdisc.

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

include/linux/netdevice.h

@@ -2827,6 +2827,7 @@ int dev_set_mac_address(struct net_device *, struct sockaddr *);
 int dev_change_carrier(struct net_device *, bool new_carrier);
 int dev_get_phys_port_id(struct net_device *dev,
 			 struct netdev_phys_port_id *ppid);
+struct sk_buff *validate_xmit_skb(struct sk_buff *skb, struct net_device *dev);
 int dev_hard_start_xmit(struct sk_buff *skb, struct net_device *dev,
 			struct netdev_queue *txq);
 int __dev_forward_skb(struct net_device *dev, struct sk_buff *skb);

net/core/dev.c

@@ -2656,7 +2656,7 @@ struct sk_buff *validate_xmit_vlan(struct sk_buff *skb, netdev_features_t featur
 	return skb;
 }
 
-static struct sk_buff *validate_xmit_skb(struct sk_buff *skb, struct net_device *dev)
+struct sk_buff *validate_xmit_skb(struct sk_buff *skb, struct net_device *dev)
 {
 	netdev_features_t features;
 
@@ -2719,10 +2719,6 @@ int dev_hard_start_xmit(struct sk_buff *skb, struct net_device *dev,
 {
 	int rc = NETDEV_TX_OK;
 
-	skb = validate_xmit_skb(skb, dev);
-	if (!skb)
-		return rc;
-
 	if (likely(!skb->next))
 		return xmit_one(skb, dev, txq, false);
 

net/sched/sch_generic.c

@@ -70,8 +70,11 @@ static inline struct sk_buff *dequeue_skb(struct Qdisc *q)
 		} else
 			skb = NULL;
 	} else {
-		if (!(q->flags & TCQ_F_ONETXQUEUE) || !netif_xmit_frozen_or_stopped(txq))
+		if (!(q->flags & TCQ_F_ONETXQUEUE) || !netif_xmit_frozen_or_stopped(txq)) {
 			skb = q->dequeue(q);
+			if (skb)
+				skb = validate_xmit_skb(skb, qdisc_dev(q));
+		}
 	}
 
 	return skb;