1 #ifndef _NET_FLOW_DISSECTOR_H
2 #define _NET_FLOW_DISSECTOR_H
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.
18 /* (src,dst) must be grouped, in the same way than in IP header */
30 bool __skb_flow_dissect(const struct sk_buff *skb, struct flow_keys *flow,
31 void *data, __be16 proto, int nhoff, int hlen);
33 static inline bool skb_flow_dissect(const struct sk_buff *skb,
34 struct flow_keys *flow)
36 return __skb_flow_dissect(skb, flow, NULL, 0, 0, 0);
39 __be32 __skb_flow_get_ports(const struct sk_buff *skb, int thoff, u8 ip_proto,
40 void *data, int hlen_proto);
42 static inline __be32 skb_flow_get_ports(const struct sk_buff *skb,
43 int thoff, u8 ip_proto)
45 return __skb_flow_get_ports(skb, thoff, ip_proto, NULL, 0);
48 u32 flow_hash_from_keys(struct flow_keys *keys);
49 void __skb_get_hash(struct sk_buff *skb);
50 u32 skb_get_poff(const struct sk_buff *skb);
51 u32 __skb_get_poff(const struct sk_buff *skb, void *data,
52 const struct flow_keys *keys, int hlen);
54 /* struct flow_keys_digest:
56 * This structure is used to hold a digest of the full flow keys. This is a
57 * larger "hash" of a flow to allow definitively matching specific flows where
58 * the 32 bit skb->hash is not large enough. The size is limited to 16 bytes so
59 * that it can by used in CB of skb (see sch_choke for an example).
61 #define FLOW_KEYS_DIGEST_LEN 16
62 struct flow_keys_digest {
63 u8 data[FLOW_KEYS_DIGEST_LEN];
66 void make_flow_keys_digest(struct flow_keys_digest *digest,
67 const struct flow_keys *flow);