vlan: deliver packets received with VLAN acceleration to network taps
[linux-2.6.git] / 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);