#ifndef _NET_FLOW_KEYS_H
  #define _NET_FLOW_KEYS_H
  
  struct flow_keys {
  	/* (src,dst) must be grouped, in the same way than in IP header */
  	__be32 src;
  	__be32 dst;
  	union {
  		__be32 ports;
  		__be16 port16[2];
  	};
  	u16 thoff;
  	u8 ip_proto;
  };
  
  bool skb_flow_dissect(const struct sk_buff *skb, struct flow_keys *flow);
  __be32 skb_flow_get_ports(const struct sk_buff *skb, int thoff, u8 ip_proto);
  #endif