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 */
17 struct 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 u16 n_proto;
27 u8 ip_proto;
28 };
29
30 bool __skb_flow_dissect(const struct sk_buff *skb, struct flow_keys *flow,
31 void *data, __be16 proto, int nhoff, int hlen);
skb_flow_dissect(const struct sk_buff * skb,struct flow_keys * flow)32 static 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);
skb_flow_get_ports(const struct sk_buff * skb,int thoff,u8 ip_proto)38 static 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 }
42 u32 flow_hash_from_keys(struct flow_keys *keys);
43 unsigned int flow_get_hlen(const unsigned char *data, unsigned int max_len,
44 __be16 protocol);
45 #endif
46