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 struct vlan_hwaccel_cb {
   7         struct net_device       *dev;
   8 };
   9
  10 static inline struct vlan_hwaccel_cb *vlan_hwaccel_cb(struct sk_buff *skb)
  11 {
  12         return (struct vlan_hwaccel_cb *)skb->cb;
  13 }
  14
  15 /* VLAN rx hw acceleration helper.  This acts like netif_{rx,receive_skb}(). */
  16 int __vlan_hwaccel_rx(struct sk_buff *skb, struct vlan_group *grp,
  17                       u16 vlan_tci, int polling)
  18 {
  19         struct vlan_hwaccel_cb *cb = vlan_hwaccel_cb(skb);
  20
  21         if (skb_bond_should_drop(skb)) {
  22                 dev_kfree_skb_any(skb);
  23                 return NET_RX_DROP;
  24         }
  25
  26         skb->vlan_tci = vlan_tci;
  27         cb->dev = vlan_group_get_device(grp, vlan_tci & VLAN_VID_MASK);
  28
  29         return (polling ? netif_receive_skb(skb) : netif_rx(skb));
  30 }
  31 EXPORT_SYMBOL(__vlan_hwaccel_rx);
  32
  33 int vlan_hwaccel_do_receive(struct sk_buff *skb)
  34 {
  35         struct vlan_hwaccel_cb *cb = vlan_hwaccel_cb(skb);
  36         struct net_device *dev = cb->dev;
  37         struct net_device_stats *stats;
  38
  39         netif_nit_deliver(skb);
  40
  41         if (dev == NULL) {
  42                 kfree_skb(skb);
  43                 return -1;
  44         }
  45
  46         skb->dev = dev;
  47         skb->priority = vlan_get_ingress_priority(dev, skb->vlan_tci);
  48         skb->vlan_tci = 0;
  49
  50         stats = &dev->stats;
  51         stats->rx_packets++;
  52         stats->rx_bytes += skb->len;
  53
  54         switch (skb->pkt_type) {
  55         case PACKET_BROADCAST:
  56                 break;
  57         case PACKET_MULTICAST:
  58                 stats->multicast++;
  59                 break;
  60         case PACKET_OTHERHOST:
  61                 /* Our lower layer thinks this is not local, let's make sure.
  62                  * This allows the VLAN to have a different MAC than the
  63                  * underlying device, and still route correctly. */
  64                 if (!compare_ether_addr(eth_hdr(skb)->h_dest,
  65                                         dev->dev_addr))
  66                         skb->pkt_type = PACKET_HOST;
  67                 break;
  68         };
  69         return 0;
  70 }
  71
  72 struct net_device *vlan_dev_real_dev(const struct net_device *dev)
  73 {
  74         return vlan_dev_info(dev)->real_dev;
  75 }
  76 EXPORT_SYMBOL_GPL(vlan_dev_real_dev);
  77
  78 u16 vlan_dev_vlan_id(const struct net_device *dev)
  79 {
  80         return vlan_dev_info(dev)->vlan_id;
  81 }
  82 EXPORT_SYMBOL_GPL(vlan_dev_vlan_id);