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0744dd00 ED |
1 | #ifndef _NET_FLOW_KEYS_H |
2 | #define _NET_FLOW_KEYS_H | |
3 | ||
e0f31d84 GV |
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 | */ | |
0744dd00 | 17 | struct flow_keys { |
4d77d2b5 | 18 | /* (src,dst) must be grouped, in the same way than in IP header */ |
0744dd00 ED |
19 | __be32 src; |
20 | __be32 dst; | |
21 | union { | |
22 | __be32 ports; | |
23 | __be16 port16[2]; | |
24 | }; | |
f4575d35 ED |
25 | u16 thoff; |
26 | __be16 n_proto; | |
27 | u8 ip_proto; | |
0744dd00 ED |
28 | }; |
29 | ||
690e36e7 | 30 | bool __skb_flow_dissect(const struct sk_buff *skb, struct flow_keys *flow, |
453a940e | 31 | void *data, __be16 proto, int nhoff, int hlen); |
690e36e7 DM |
32 | static inline bool skb_flow_dissect(const struct sk_buff *skb, struct flow_keys *flow) |
33 | { | |
453a940e | 34 | return __skb_flow_dissect(skb, flow, NULL, 0, 0, 0); |
690e36e7 DM |
35 | } |
36 | __be32 __skb_flow_get_ports(const struct sk_buff *skb, int thoff, u8 ip_proto, | |
37 | void *data, int hlen_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 | } | |
5ed20a68 | 42 | u32 flow_hash_from_keys(struct flow_keys *keys); |
56193d1b AD |
43 | unsigned int flow_get_hlen(const unsigned char *data, unsigned int max_len, |
44 | __be16 protocol); | |
2f59e1eb TH |
45 | |
46 | /* struct flow_keys_digest: | |
47 | * | |
48 | * This structure is used to hold a digest of the full flow keys. This is a | |
49 | * larger "hash" of a flow to allow definitively matching specific flows where | |
50 | * the 32 bit skb->hash is not large enough. The size is limited to 16 bytes so | |
51 | * that it can by used in CB of skb (see sch_choke for an example). | |
52 | */ | |
53 | #define FLOW_KEYS_DIGEST_LEN 16 | |
54 | struct flow_keys_digest { | |
55 | u8 data[FLOW_KEYS_DIGEST_LEN]; | |
56 | }; | |
57 | ||
58 | void make_flow_keys_digest(struct flow_keys_digest *digest, | |
59 | const struct flow_keys *flow); | |
60 | ||
0744dd00 | 61 | #endif |