git.oblomov.eu Git - linux-2.6/blob - 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->vlan_tci = 0;
  28
  29         stats = &skb->dev->stats;
  30         stats->rx_packets++;
  31         stats->rx_bytes += skb->len;
  32
  33         skb->priority = vlan_get_ingress_priority(skb->dev, vlan_tci);
  34         switch (skb->pkt_type) {
  35         case PACKET_BROADCAST:
  36                 break;
  37         case PACKET_MULTICAST:
  38                 stats->multicast++;
  39                 break;
  40         case PACKET_OTHERHOST:
  41                 /* Our lower layer thinks this is not local, let's make sure.
  42                  * This allows the VLAN to have a different MAC than the
  43                  * underlying device, and still route correctly. */
  44                 if (!compare_ether_addr(eth_hdr(skb)->h_dest,
  45                                         skb->dev->dev_addr))
  46                         skb->pkt_type = PACKET_HOST;
  47                 break;
  48         };
  49         return (polling ? netif_receive_skb(skb) : netif_rx(skb));
  50 }
  51 EXPORT_SYMBOL(__vlan_hwaccel_rx);
  52
  53 struct net_device *vlan_dev_real_dev(const struct net_device *dev)
  54 {
  55         return vlan_dev_info(dev)->real_dev;
  56 }
  57 EXPORT_SYMBOL_GPL(vlan_dev_real_dev);
  58
  59 u16 vlan_dev_vlan_id(const struct net_device *dev)
  60 {
  61         return vlan_dev_info(dev)->vlan_id;
  62 }
  63 EXPORT_SYMBOL_GPL(vlan_dev_vlan_id);