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_ipv4_addrs:
32 * @src: source ip address
33 * @dst: destination ip address
35 struct flow_dissector_key_ipv4_addrs {
36 /* (src,dst) must be grouped, in the same way than in IP header */
42 * struct flow_dissector_key_ipv6_addrs:
43 * @src: source ip address
44 * @dst: destination ip address
46 struct flow_dissector_key_ipv6_addrs {
47 /* (src,dst) must be grouped, in the same way than in IP header */
53 * struct flow_dissector_key_tipc_addrs:
54 * @srcnode: source node address
56 struct flow_dissector_key_tipc_addrs {
61 * struct flow_dissector_key_addrs:
62 * @v4addrs: IPv4 addresses
63 * @v6addrs: IPv6 addresses
65 struct flow_dissector_key_addrs {
67 struct flow_dissector_key_ipv4_addrs v4addrs;
68 struct flow_dissector_key_ipv6_addrs v6addrs;
69 struct flow_dissector_key_tipc_addrs tipcaddrs;
74 * flow_dissector_key_tp_ports:
75 * @ports: port numbers of Transport header
76 * src: source port number
77 * dst: destination port number
79 struct flow_dissector_key_ports {
91 * struct flow_dissector_key_eth_addrs:
92 * @src: source Ethernet address
93 * @dst: destination Ethernet address
95 struct flow_dissector_key_eth_addrs {
96 /* (dst,src) must be grouped, in the same way than in ETH header */
97 unsigned char dst[ETH_ALEN];
98 unsigned char src[ETH_ALEN];
101 enum flow_dissector_key_id {
102 FLOW_DISSECTOR_KEY_CONTROL, /* struct flow_dissector_key_control */
103 FLOW_DISSECTOR_KEY_BASIC, /* struct flow_dissector_key_basic */
104 FLOW_DISSECTOR_KEY_IPV4_ADDRS, /* struct flow_dissector_key_ipv4_addrs */
105 FLOW_DISSECTOR_KEY_IPV6_ADDRS, /* struct flow_dissector_key_ipv6_addrs */
106 FLOW_DISSECTOR_KEY_IPV6_HASH_ADDRS, /* struct flow_dissector_key_addrs */
107 FLOW_DISSECTOR_KEY_PORTS, /* struct flow_dissector_key_ports */
108 FLOW_DISSECTOR_KEY_ETH_ADDRS, /* struct flow_dissector_key_eth_addrs */
109 FLOW_DISSECTOR_KEY_TIPC_ADDRS, /* struct flow_dissector_key_tipc_addrs */
111 FLOW_DISSECTOR_KEY_MAX,
114 struct flow_dissector_key {
115 enum flow_dissector_key_id key_id;
116 size_t offset; /* offset of struct flow_dissector_key_*
117 in target the struct */
120 struct flow_dissector {
121 unsigned int used_keys; /* each bit repesents presence of one key id */
122 unsigned short int offset[FLOW_DISSECTOR_KEY_MAX];
125 void skb_flow_dissector_init(struct flow_dissector *flow_dissector,
126 const struct flow_dissector_key *key,
127 unsigned int key_count);
129 bool __skb_flow_dissect(const struct sk_buff *skb,
130 struct flow_dissector *flow_dissector,
131 void *target_container,
132 void *data, __be16 proto, int nhoff, int hlen);
134 static inline bool skb_flow_dissect(const struct sk_buff *skb,
135 struct flow_dissector *flow_dissector,
136 void *target_container)
138 return __skb_flow_dissect(skb, flow_dissector, target_container,
143 struct flow_dissector_key_control control;
144 #define FLOW_KEYS_HASH_START_FIELD basic
145 struct flow_dissector_key_basic basic;
146 struct flow_dissector_key_ports ports;
147 struct flow_dissector_key_addrs addrs;
150 #define FLOW_KEYS_HASH_OFFSET \
151 offsetof(struct flow_keys, FLOW_KEYS_HASH_START_FIELD)
153 __be32 flow_get_u32_src(const struct flow_keys *flow);
154 __be32 flow_get_u32_dst(const struct flow_keys *flow);
156 extern struct flow_dissector flow_keys_dissector;
157 extern struct flow_dissector flow_keys_buf_dissector;
159 static inline bool skb_flow_dissect_flow_keys(const struct sk_buff *skb,
160 struct flow_keys *flow)
162 memset(flow, 0, sizeof(*flow));
163 return __skb_flow_dissect(skb, &flow_keys_dissector, flow,
167 static inline bool skb_flow_dissect_flow_keys_buf(struct flow_keys *flow,
168 void *data, __be16 proto,
171 memset(flow, 0, sizeof(*flow));
172 return __skb_flow_dissect(NULL, &flow_keys_buf_dissector, flow,
173 data, proto, nhoff, hlen);
176 __be32 __skb_flow_get_ports(const struct sk_buff *skb, int thoff, u8 ip_proto,
177 void *data, int hlen_proto);
179 static inline __be32 skb_flow_get_ports(const struct sk_buff *skb,
180 int thoff, u8 ip_proto)
182 return __skb_flow_get_ports(skb, thoff, ip_proto, NULL, 0);
185 u32 flow_hash_from_keys(struct flow_keys *keys);
186 void __skb_get_hash(struct sk_buff *skb);
187 u32 skb_get_poff(const struct sk_buff *skb);
188 u32 __skb_get_poff(const struct sk_buff *skb, void *data,
189 const struct flow_keys *keys, int hlen);
191 /* struct flow_keys_digest:
193 * This structure is used to hold a digest of the full flow keys. This is a
194 * larger "hash" of a flow to allow definitively matching specific flows where
195 * the 32 bit skb->hash is not large enough. The size is limited to 16 bytes so
196 * that it can by used in CB of skb (see sch_choke for an example).
198 #define FLOW_KEYS_DIGEST_LEN 16
199 struct flow_keys_digest {
200 u8 data[FLOW_KEYS_DIGEST_LEN];
203 void make_flow_keys_digest(struct flow_keys_digest *digest,
204 const struct flow_keys *flow);