1 files changed, 84 insertions, 0 deletions
diff --git a/net/8021q/vlan_core.c b/net/8021q/vlan_core.c
new file mode 100644
index 0000000..68ced4b
--- /dev/null
+++ b/net/8021q/vlan_core.c
@@ -0,0 +1,84 @@
+#include <linux/skbuff.h>
+#include <linux/netdevice.h>
+#include <linux/if_vlan.h>
+#include "vlan.h"
+
+struct vlan_hwaccel_cb {
+	struct net_device	*dev;
+};
+
+static inline struct vlan_hwaccel_cb *vlan_hwaccel_cb(struct sk_buff *skb)
+{
+	return (struct vlan_hwaccel_cb *)skb->cb;
+}
+
+/* VLAN rx hw acceleration helper.  This acts like netif_{rx,receive_skb}(). */
+int __vlan_hwaccel_rx(struct sk_buff *skb, struct vlan_group *grp,
+		      u16 vlan_tci, int polling)
+{
+	struct vlan_hwaccel_cb *cb = vlan_hwaccel_cb(skb);
+
+	if (skb_bond_should_drop(skb)) {
+		dev_kfree_skb_any(skb);
+		return NET_RX_DROP;
+	}
+
+	skb->vlan_tci = vlan_tci;
+	cb->dev = vlan_group_get_device(grp, vlan_tci & VLAN_VID_MASK);
+
+	return (polling ? netif_receive_skb(skb) : netif_rx(skb));
+}
+EXPORT_SYMBOL(__vlan_hwaccel_rx);
+
+int vlan_hwaccel_do_receive(struct sk_buff *skb)
+{
+	struct vlan_hwaccel_cb *cb = vlan_hwaccel_cb(skb);
+	struct net_device *dev = cb->dev;
+	struct net_device_stats *stats;
+
+	netif_nit_deliver(skb);
+
+	if (dev == NULL) {
+		kfree_skb(skb);
+		return -1;
+	}
+
+	skb->dev = dev;
+	skb->priority = vlan_get_ingress_priority(dev, skb->vlan_tci);
+	skb->vlan_tci = 0;
+
+	dev->last_rx = jiffies;
+
+	stats = &dev->stats;
+	stats->rx_packets++;
+	stats->rx_bytes += skb->len;
+
+	switch (skb->pkt_type) {
+	case PACKET_BROADCAST:
+		break;
+	case PACKET_MULTICAST:
+		stats->multicast++;
+		break;
+	case PACKET_OTHERHOST:
+		/* Our lower layer thinks this is not local, let's make sure.
+		 * This allows the VLAN to have a different MAC than the
+		 * underlying device, and still route correctly. */
+		if (!compare_ether_addr(eth_hdr(skb)->h_dest,
+					dev->dev_addr))
+			skb->pkt_type = PACKET_HOST;
+		break;
+	};
+	return 0;
+}
+
+struct net_device *vlan_dev_real_dev(const struct net_device *dev)
+{
+	return vlan_dev_info(dev)->real_dev;
+}
+EXPORT_SYMBOL_GPL(vlan_dev_real_dev);
+
+u16 vlan_dev_vlan_id(const struct net_device *dev)
+{
+	return vlan_dev_info(dev)->vlan_id;
+}
+EXPORT_SYMBOL_GPL(vlan_dev_vlan_id);