net: Add __dev_forward_skb

This patch adds the helper __dev_forward_skb which is identical to
dev_forward_skb except that it doesn't actually inject the skb into
the stack.  This is useful where we wish to have finer control over
how the packet is injected, e.g., via netif_rx_ni or netif_receive_skb.

Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 24 insertions, 18 deletions

diff --git a/net/core/dev.c b/net/core/dev.c
index d2c8a06b3a98..11d70e3afefa 100644
--- a/net/core/dev.c
+++ b/net/core/dev.c
@@ -1661,6 +1661,29 @@ bool is_skb_forwardable(struct net_device *dev, struct sk_buff *skb)
 }
 EXPORT_SYMBOL_GPL(is_skb_forwardable);
 
+int __dev_forward_skb(struct net_device *dev, struct sk_buff *skb)
+{
+	if (skb_shinfo(skb)->tx_flags & SKBTX_DEV_ZEROCOPY) {
+		if (skb_copy_ubufs(skb, GFP_ATOMIC)) {
+			atomic_long_inc(&dev->rx_dropped);
+			kfree_skb(skb);
+			return NET_RX_DROP;
+		}
+	}
+
+	if (unlikely(!is_skb_forwardable(dev, skb))) {
+		atomic_long_inc(&dev->rx_dropped);
+		kfree_skb(skb);
+		return NET_RX_DROP;
+	}
+
+	skb_scrub_packet(skb, true);
+	skb->protocol = eth_type_trans(skb, dev);
+
+	return 0;
+}
+EXPORT_SYMBOL_GPL(__dev_forward_skb);
+
 /**
  * dev_forward_skb - loopback an skb to another netif
  *
@@ -1681,24 +1704,7 @@ EXPORT_SYMBOL_GPL(is_skb_forwardable);
  */
 int dev_forward_skb(struct net_device *dev, struct sk_buff *skb)
 {
-	if (skb_shinfo(skb)->tx_flags & SKBTX_DEV_ZEROCOPY) {
-		if (skb_copy_ubufs(skb, GFP_ATOMIC)) {
-			atomic_long_inc(&dev->rx_dropped);
-			kfree_skb(skb);
-			return NET_RX_DROP;
-		}
-	}
-
-	if (unlikely(!is_skb_forwardable(dev, skb))) {
-		atomic_long_inc(&dev->rx_dropped);
-		kfree_skb(skb);
-		return NET_RX_DROP;
-	}
-
-	skb_scrub_packet(skb, true);
-	skb->protocol = eth_type_trans(skb, dev);
-
-	return netif_rx_internal(skb);
+	return __dev_forward_skb(dev, skb) ?: netif_rx_internal(skb);
 }
 EXPORT_SYMBOL_GPL(dev_forward_skb);