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_control:
11 * @thoff: Transport header offset
13 struct flow_dissector_key_control {
19 * struct flow_dissector_key_basic:
20 * @thoff: Transport header offset
21 * @n_proto: Network header protocol (eg. IPv4/IPv6)
22 * @ip_proto: Transport header protocol (eg. TCP/UDP)
24 struct flow_dissector_key_basic {
31 * struct flow_dissector_key_addrs:
32 * @src: source ip address in case of IPv4
33 * For IPv6 it contains 32bit hash of src address
34 * @dst: destination ip address in case of IPv4
35 * For IPv6 it contains 32bit hash of dst address
37 struct flow_dissector_key_addrs {
38 /* (src,dst) must be grouped, in the same way than in IP header */
44 * flow_dissector_key_tp_ports:
45 * @ports: port numbers of Transport header
46 * src: source port number
47 * dst: destination port number
49 struct flow_dissector_key_ports {
60 * struct flow_dissector_key_ipv6_addrs:
61 * @src: source ip address
62 * @dst: destination ip address
64 struct flow_dissector_key_ipv6_addrs {
65 /* (src,dst) must be grouped, in the same way than in IP header */
71 * struct flow_dissector_key_eth_addrs:
72 * @src: source Ethernet address
73 * @dst: destination Ethernet address
75 struct flow_dissector_key_eth_addrs {
76 /* (dst,src) must be grouped, in the same way than in ETH header */
77 unsigned char dst[ETH_ALEN];
78 unsigned char src[ETH_ALEN];
81 enum flow_dissector_key_id {
82 FLOW_DISSECTOR_KEY_CONTROL, /* struct flow_dissector_key_control */
83 FLOW_DISSECTOR_KEY_BASIC, /* struct flow_dissector_key_basic */
84 FLOW_DISSECTOR_KEY_IPV4_ADDRS, /* struct flow_dissector_key_addrs */
85 FLOW_DISSECTOR_KEY_IPV6_HASH_ADDRS, /* struct flow_dissector_key_addrs */
86 FLOW_DISSECTOR_KEY_PORTS, /* struct flow_dissector_key_ports */
87 FLOW_DISSECTOR_KEY_IPV6_ADDRS, /* struct flow_dissector_key_ipv6_addrs */
88 FLOW_DISSECTOR_KEY_ETH_ADDRS, /* struct flow_dissector_key_eth_addrs */
90 FLOW_DISSECTOR_KEY_MAX,
93 struct flow_dissector_key {
94 enum flow_dissector_key_id key_id;
95 size_t offset; /* offset of struct flow_dissector_key_*
96 in target the struct */
99 struct flow_dissector {
100 unsigned int used_keys; /* each bit repesents presence of one key id */
101 unsigned short int offset[FLOW_DISSECTOR_KEY_MAX];
104 void skb_flow_dissector_init(struct flow_dissector *flow_dissector,
105 const struct flow_dissector_key *key,
106 unsigned int key_count);
108 bool __skb_flow_dissect(const struct sk_buff *skb,
109 struct flow_dissector *flow_dissector,
110 void *target_container,
111 void *data, __be16 proto, int nhoff, int hlen);
113 static inline bool skb_flow_dissect(const struct sk_buff *skb,
114 struct flow_dissector *flow_dissector,
115 void *target_container)
117 return __skb_flow_dissect(skb, flow_dissector, target_container,
122 struct flow_dissector_key_control control;
123 #define FLOW_KEYS_HASH_START_FIELD basic
124 struct flow_dissector_key_basic basic;
125 struct flow_dissector_key_ports ports;
126 struct flow_dissector_key_addrs addrs;
129 #define FLOW_KEYS_HASH_OFFSET \
130 offsetof(struct flow_keys, FLOW_KEYS_HASH_START_FIELD)
132 extern struct flow_dissector flow_keys_dissector;
133 extern struct flow_dissector flow_keys_buf_dissector;
135 static inline bool skb_flow_dissect_flow_keys(const struct sk_buff *skb,
136 struct flow_keys *flow)
138 memset(flow, 0, sizeof(*flow));
139 return __skb_flow_dissect(skb, &flow_keys_dissector, flow,
143 static inline bool skb_flow_dissect_flow_keys_buf(struct flow_keys *flow,
144 void *data, __be16 proto,
147 memset(flow, 0, sizeof(*flow));
148 return __skb_flow_dissect(NULL, &flow_keys_buf_dissector, flow,
149 data, proto, nhoff, hlen);
152 __be32 __skb_flow_get_ports(const struct sk_buff *skb, int thoff, u8 ip_proto,
153 void *data, int hlen_proto);
155 static inline __be32 skb_flow_get_ports(const struct sk_buff *skb,
156 int thoff, u8 ip_proto)
158 return __skb_flow_get_ports(skb, thoff, ip_proto, NULL, 0);
161 u32 flow_hash_from_keys(struct flow_keys *keys);
162 void __skb_get_hash(struct sk_buff *skb);
163 u32 skb_get_poff(const struct sk_buff *skb);
164 u32 __skb_get_poff(const struct sk_buff *skb, void *data,
165 const struct flow_keys *keys, int hlen);
167 /* struct flow_keys_digest:
169 * This structure is used to hold a digest of the full flow keys. This is a
170 * larger "hash" of a flow to allow definitively matching specific flows where
171 * the 32 bit skb->hash is not large enough. The size is limited to 16 bytes so
172 * that it can by used in CB of skb (see sch_choke for an example).
174 #define FLOW_KEYS_DIGEST_LEN 16
175 struct flow_keys_digest {
176 u8 data[FLOW_KEYS_DIGEST_LEN];
179 void make_flow_keys_digest(struct flow_keys_digest *digest,
180 const struct flow_keys *flow);