1 #ifndef _NET_FLOW_DISSECTOR_H
2 #define _NET_FLOW_DISSECTOR_H
5 * struct flow_dissector_key_basic:
6 * @thoff: Transport header offset
7 * @n_proto: Network header protocol (eg. IPv4/IPv6)
8 * @ip_proto: Transport header protocol (eg. TCP/UDP)
10 struct flow_dissector_key_basic {
17 * struct flow_dissector_key_addrs:
18 * @src: source ip address in case of IPv4
19 * For IPv6 it contains 32bit hash of src address
20 * @dst: destination ip address in case of IPv4
21 * For IPv6 it contains 32bit hash of dst address
23 struct flow_dissector_key_addrs {
24 /* (src,dst) must be grouped, in the same way than in IP header */
30 * flow_dissector_key_tp_ports:
31 * @ports: port numbers of Transport header
32 * port16[0]: src port number
33 * port16[1]: dst port number
35 struct flow_dissector_key_ports {
42 enum flow_dissector_key_id {
43 FLOW_DISSECTOR_KEY_BASIC, /* struct flow_dissector_key_basic */
44 FLOW_DISSECTOR_KEY_IPV4_ADDRS, /* struct flow_dissector_key_addrs */
45 FLOW_DISSECTOR_KEY_IPV6_HASH_ADDRS, /* struct flow_dissector_key_addrs */
46 FLOW_DISSECTOR_KEY_PORTS, /* struct flow_dissector_key_ports */
48 FLOW_DISSECTOR_KEY_MAX,
51 struct flow_dissector_key {
52 enum flow_dissector_key_id key_id;
53 size_t offset; /* offset of struct flow_dissector_key_*
54 in target the struct */
57 struct flow_dissector {
58 unsigned int used_keys; /* each bit repesents presence of one key id */
59 unsigned short int offset[FLOW_DISSECTOR_KEY_MAX];
63 * @src: source ip address in case of IPv4
64 * For IPv6 it contains 32bit hash of src address
65 * @dst: destination ip address in case of IPv4
66 * For IPv6 it contains 32bit hash of dst address
67 * @ports: port numbers of Transport header
68 * port16[0]: src port number
69 * port16[1]: dst port number
70 * @thoff: Transport header offset
71 * @n_proto: Network header protocol (eg. IPv4/IPv6)
72 * @ip_proto: Transport header protocol (eg. TCP/UDP)
73 * All the members, except thoff, are in network byte order.
76 /* (src,dst) must be grouped, in the same way than in IP header */
88 void skb_flow_dissector_init(struct flow_dissector *flow_dissector,
89 const struct flow_dissector_key *key,
90 unsigned int key_count);
91 bool __skb_flow_dissect(const struct sk_buff *skb, struct flow_keys *flow,
92 void *data, __be16 proto, int nhoff, int hlen);
94 static inline bool skb_flow_dissect(const struct sk_buff *skb,
95 struct flow_keys *flow)
97 return __skb_flow_dissect(skb, flow, NULL, 0, 0, 0);
100 __be32 __skb_flow_get_ports(const struct sk_buff *skb, int thoff, u8 ip_proto,
101 void *data, int hlen_proto);
103 static inline __be32 skb_flow_get_ports(const struct sk_buff *skb,
104 int thoff, u8 ip_proto)
106 return __skb_flow_get_ports(skb, thoff, ip_proto, NULL, 0);
109 u32 flow_hash_from_keys(struct flow_keys *keys);
110 void __skb_get_hash(struct sk_buff *skb);
111 u32 skb_get_poff(const struct sk_buff *skb);
112 u32 __skb_get_poff(const struct sk_buff *skb, void *data,
113 const struct flow_keys *keys, int hlen);
115 /* struct flow_keys_digest:
117 * This structure is used to hold a digest of the full flow keys. This is a
118 * larger "hash" of a flow to allow definitively matching specific flows where
119 * the 32 bit skb->hash is not large enough. The size is limited to 16 bytes so
120 * that it can by used in CB of skb (see sch_choke for an example).
122 #define FLOW_KEYS_DIGEST_LEN 16
123 struct flow_keys_digest {
124 u8 data[FLOW_KEYS_DIGEST_LEN];
127 void make_flow_keys_digest(struct flow_keys_digest *digest,
128 const struct flow_keys *flow);