1#ifndef _NET_FLOW_KEYS_H
2#define _NET_FLOW_KEYS_H
3
4/* struct flow_keys:
5 *	@src: source ip address in case of IPv4
6 *	      For IPv6 it contains 32bit hash of src address
7 *	@dst: destination ip address in case of IPv4
8 *	      For IPv6 it contains 32bit hash of dst address
9 *	@ports: port numbers of Transport header
10 *		port16[0]: src port number
11 *		port16[1]: dst port number
12 *	@thoff: Transport header offset
13 *	@n_proto: Network header protocol (eg. IPv4/IPv6)
14 *	@ip_proto: Transport header protocol (eg. TCP/UDP)
15 * All the members, except thoff, are in network byte order.
16 */
17struct flow_keys {
18	/* (src,dst) must be grouped, in the same way than in IP header */
19	__be32 src;
20	__be32 dst;
21	union {
22		__be32 ports;
23		__be16 port16[2];
24	};
25	u16	thoff;
26	__be16	n_proto;
27	u8	ip_proto;
28};
29
30bool __skb_flow_dissect(const struct sk_buff *skb, struct flow_keys *flow,
31			void *data, __be16 proto, int nhoff, int hlen);
32static inline bool skb_flow_dissect(const struct sk_buff *skb, struct flow_keys *flow)
33{
34	return __skb_flow_dissect(skb, flow, NULL, 0, 0, 0);
35}
36__be32 __skb_flow_get_ports(const struct sk_buff *skb, int thoff, u8 ip_proto,
37			    void *data, int hlen_proto);
38static inline __be32 skb_flow_get_ports(const struct sk_buff *skb, int thoff, u8 ip_proto)
39{
40	return __skb_flow_get_ports(skb, thoff, ip_proto, NULL, 0);
41}
42u32 flow_hash_from_keys(struct flow_keys *keys);
43unsigned int flow_get_hlen(const unsigned char *data, unsigned int max_len,
44			   __be16 protocol);
45#endif
46