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         dev->last_rx = jiffies;
  51
  52         stats = &dev->stats;
  53         stats->rx_packets++;
  54         stats->rx_bytes += skb->len;
  55
  56         switch (skb->pkt_type) {
  57         case PACKET_BROADCAST:
  58                 break;
  59         case PACKET_MULTICAST:
  60                 stats->multicast++;
  61                 break;
  62         case PACKET_OTHERHOST:
  63                 /* Our lower layer thinks this is not local, let's make sure.
  64                  * This allows the VLAN to have a different MAC than the
  65                  * underlying device, and still route correctly. */
  66                 if (!compare_ether_addr(eth_hdr(skb)->h_dest,
  67                                         dev->dev_addr))
  68                         skb->pkt_type = PACKET_HOST;
  69                 break;
  70         };
  71         return 0;
  72 }
  73
  74 struct net_device *vlan_dev_real_dev(const struct net_device *dev)
  75 {
  76         return vlan_dev_info(dev)->real_dev;
  77 }
  78 EXPORT_SYMBOL_GPL(vlan_dev_real_dev);
  79
  80 u16 vlan_dev_vlan_id(const struct net_device *dev)
  81 {
  82         return vlan_dev_info(dev)->vlan_id;
  83 }
  84 EXPORT_SYMBOL_GPL(vlan_dev_vlan_id);