1 #ifndef _NET_FLOW_DISSECTOR_H
2 #define _NET_FLOW_DISSECTOR_H
4 #include <linux/types.h>
5 #include <linux/skbuff.h>
7 #include <uapi/linux/if_ether.h>
10 * struct flow_dissector_key_basic:
11 * @thoff: Transport header offset
12 * @n_proto: Network header protocol (eg. IPv4/IPv6)
13 * @ip_proto: Transport header protocol (eg. TCP/UDP)
15 struct flow_dissector_key_basic {
22 * struct flow_dissector_key_addrs:
23 * @src: source ip address in case of IPv4
24 * For IPv6 it contains 32bit hash of src address
25 * @dst: destination ip address in case of IPv4
26 * For IPv6 it contains 32bit hash of dst address
28 struct flow_dissector_key_addrs {
29 /* (src,dst) must be grouped, in the same way than in IP header */
35 * flow_dissector_key_tp_ports:
36 * @ports: port numbers of Transport header
37 * src: source port number
38 * dst: destination port number
40 struct flow_dissector_key_ports {
51 * struct flow_dissector_key_ipv6_addrs:
52 * @src: source ip address
53 * @dst: destination ip address
55 struct flow_dissector_key_ipv6_addrs {
56 /* (src,dst) must be grouped, in the same way than in IP header */
62 * struct flow_dissector_key_eth_addrs:
63 * @src: source Ethernet address
64 * @dst: destination Ethernet address
66 struct flow_dissector_key_eth_addrs {
67 /* (dst,src) must be grouped, in the same way than in ETH header */
68 unsigned char dst[ETH_ALEN];
69 unsigned char src[ETH_ALEN];
72 enum flow_dissector_key_id {
73 FLOW_DISSECTOR_KEY_BASIC, /* struct flow_dissector_key_basic */
74 FLOW_DISSECTOR_KEY_IPV4_ADDRS, /* struct flow_dissector_key_addrs */
75 FLOW_DISSECTOR_KEY_IPV6_HASH_ADDRS, /* struct flow_dissector_key_addrs */
76 FLOW_DISSECTOR_KEY_PORTS, /* struct flow_dissector_key_ports */
77 FLOW_DISSECTOR_KEY_IPV6_ADDRS, /* struct flow_dissector_key_ipv6_addrs */
78 FLOW_DISSECTOR_KEY_ETH_ADDRS, /* struct flow_dissector_key_eth_addrs */
80 FLOW_DISSECTOR_KEY_MAX,
83 struct flow_dissector_key {
84 enum flow_dissector_key_id key_id;
85 size_t offset; /* offset of struct flow_dissector_key_*
86 in target the struct */
89 struct flow_dissector {
90 unsigned int used_keys; /* each bit repesents presence of one key id */
91 unsigned short int offset[FLOW_DISSECTOR_KEY_MAX];
94 void skb_flow_dissector_init(struct flow_dissector *flow_dissector,
95 const struct flow_dissector_key *key,
96 unsigned int key_count);
98 bool __skb_flow_dissect(const struct sk_buff *skb,
99 struct flow_dissector *flow_dissector,
100 void *target_container,
101 void *data, __be16 proto, int nhoff, int hlen);
103 static inline bool skb_flow_dissect(const struct sk_buff *skb,
104 struct flow_dissector *flow_dissector,
105 void *target_container)
107 return __skb_flow_dissect(skb, flow_dissector, target_container,
112 struct flow_dissector_key_addrs addrs;
113 struct flow_dissector_key_ports ports;
114 struct flow_dissector_key_basic basic;
117 extern struct flow_dissector flow_keys_dissector;
118 extern struct flow_dissector flow_keys_buf_dissector;
120 static inline bool skb_flow_dissect_flow_keys(const struct sk_buff *skb,
121 struct flow_keys *flow)
123 memset(flow, 0, sizeof(*flow));
124 return __skb_flow_dissect(skb, &flow_keys_dissector, flow,
128 static inline bool skb_flow_dissect_flow_keys_buf(struct flow_keys *flow,
129 void *data, __be16 proto,
132 memset(flow, 0, sizeof(*flow));
133 return __skb_flow_dissect(NULL, &flow_keys_buf_dissector, flow,
134 data, proto, nhoff, hlen);
137 __be32 __skb_flow_get_ports(const struct sk_buff *skb, int thoff, u8 ip_proto,
138 void *data, int hlen_proto);
140 static inline __be32 skb_flow_get_ports(const struct sk_buff *skb,
141 int thoff, u8 ip_proto)
143 return __skb_flow_get_ports(skb, thoff, ip_proto, NULL, 0);
146 u32 flow_hash_from_keys(struct flow_keys *keys);
147 void __skb_get_hash(struct sk_buff *skb);
148 u32 skb_get_poff(const struct sk_buff *skb);
149 u32 __skb_get_poff(const struct sk_buff *skb, void *data,
150 const struct flow_keys *keys, int hlen);
152 /* struct flow_keys_digest:
154 * This structure is used to hold a digest of the full flow keys. This is a
155 * larger "hash" of a flow to allow definitively matching specific flows where
156 * the 32 bit skb->hash is not large enough. The size is limited to 16 bytes so
157 * that it can by used in CB of skb (see sch_choke for an example).
159 #define FLOW_KEYS_DIGEST_LEN 16
160 struct flow_keys_digest {
161 u8 data[FLOW_KEYS_DIGEST_LEN];
164 void make_flow_keys_digest(struct flow_keys_digest *digest,
165 const struct flow_keys *flow);