net/8021q/vlan_core.c

   1 #include <linux/skbuff.h>
   2 #include <linux/netdevice.h>
   3 #include <linux/if_vlan.h>
   4 #include "vlan.h"
   5
   6 /* VLAN rx hw acceleration helper.  This acts like netif_{rx,receive_skb}(). */
   7 int __vlan_hwaccel_rx(struct sk_buff *skb, struct vlan_group *grp,
   8                       u16 vlan_tci, int polling)
   9 {
  10         struct net_device_stats *stats;
  11
  12         if (skb_bond_should_drop(skb)) {
  13                 dev_kfree_skb_any(skb);
  14                 return NET_RX_DROP;
  15         }
  16
  17         skb->vlan_tci = vlan_tci;
  18         netif_nit_deliver(skb);
  19
  20         skb->dev = vlan_group_get_device(grp, vlan_tci & VLAN_VID_MASK);
  21         if (skb->dev == NULL) {
  22                 dev_kfree_skb_any(skb);
  23                 /* Not NET_RX_DROP, this is not being dropped
  24                  * due to congestion. */
  25                 return NET_RX_SUCCESS;
  26         }
  27         skb->dev->last_rx = jiffies;
  28         skb->vlan_tci = 0;
  29
  30         stats = &skb->dev->stats;
  31         stats->rx_packets++;
  32         stats->rx_bytes += skb->len;
  33
  34         skb->priority = vlan_get_ingress_priority(skb->dev, vlan_tci);
  35         switch (skb->pkt_type) {
  36         case PACKET_BROADCAST:
  37                 break;
  38         case PACKET_MULTICAST:
  39                 stats->multicast++;
  40                 break;
  41         case PACKET_OTHERHOST:
  42                 /* Our lower layer thinks this is not local, let's make sure.
  43                  * This allows the VLAN to have a different MAC than the
  44                  * underlying device, and still route correctly. */
  45                 if (!compare_ether_addr(eth_hdr(skb)->h_dest,
  46                                         skb->dev->dev_addr))
  47                         skb->pkt_type = PACKET_HOST;
  48                 break;
  49         };
  50         return (polling ? netif_receive_skb(skb) : netif_rx(skb));
  51 }
  52 EXPORT_SYMBOL(__vlan_hwaccel_rx);
  53
  54 struct net_device *vlan_dev_real_dev(const struct net_device *dev)
  55 {
  56         return vlan_dev_info(dev)->real_dev;
  57 }
  58 EXPORT_SYMBOL_GPL(vlan_dev_real_dev);
  59
  60 u16 vlan_dev_vlan_id(const struct net_device *dev)
  61 {
  62         return vlan_dev_info(dev)->vlan_id;
  63 }
  64 EXPORT_SYMBOL_GPL(vlan_dev_vlan_id);