8021q

[vlan_proto_init]

    - vlan_proc_init

    - dev_add_pack

    - register_netdevice_notifiler

    - vlan_ioctl_set(vlan_ioctl_handler)

static struct packet_type vlan_packet_type = {

.type = __constant_htons(ETH_P_8021Q),

.func = vlan_skb_recv, /* VLAN receive method */

};

[vlan_skb_recv]

    - get vlan from skb->data(vlan_hdr)

    - skb->dev = __find_vlan_dev (from eth0 to eth0.10)

        - __vlan_find_group

        - vlan_group_get_device

    - stats 

    - skb_pull_rcsum(skb, VLAN_HLEN); (take off vlan header)

    - check dev

    - vlan_get_ingress_priority

    - vlan_check_reorder_header

        - skb_shared

        - skb_clone

        - kfree_skb (user-1)

    - netif_rx