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/* include/linux/netdevice.h */
struct packet_type {
 __be16   type; /* This is really htons(ether_type). */
 struct net_device *dev; /* NULL is wildcarded here      */
 int   (*func) (struct sk_buff *,
      struct net_device *,
      struct packet_type *,
      struct net_device *);
 void   *af_packet_priv;
 struct list_head list;
};
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/* net/core/dev.c */
/**
 * dev_add_pack - add packet handler
 * @pt: packet type declaration
 *
 * Add a protocol handler to the networking stack. The passed &packet_type
 * is linked into kernel lists and may not be freed until it has been
 * removed from the kernel lists.
 *
 * This call does not sleep therefore it can not
 * guarantee all CPU's that are in middle of receiving packets
 * will see the new packet type (until the next received packet).
 */
void dev_add_pack(struct packet_type *pt)
{
 int hash;
 


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