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 {
30 struct flow_dissector_key_tags {
36 * struct flow_dissector_key_ipv4_addrs:
37 * @src: source ip address
38 * @dst: destination ip address
40 struct flow_dissector_key_ipv4_addrs {
41 /* (src,dst) must be grouped, in the same way than in IP header */
47 * struct flow_dissector_key_ipv6_addrs:
48 * @src: source ip address
49 * @dst: destination ip address
51 struct flow_dissector_key_ipv6_addrs {
52 /* (src,dst) must be grouped, in the same way than in IP header */
58 * struct flow_dissector_key_tipc_addrs:
59 * @srcnode: source node address
61 struct flow_dissector_key_tipc_addrs {
66 * struct flow_dissector_key_addrs:
67 * @v4addrs: IPv4 addresses
68 * @v6addrs: IPv6 addresses
70 struct flow_dissector_key_addrs {
72 struct flow_dissector_key_ipv4_addrs v4addrs;
73 struct flow_dissector_key_ipv6_addrs v6addrs;
74 struct flow_dissector_key_tipc_addrs tipcaddrs;
79 * flow_dissector_key_tp_ports:
80 * @ports: port numbers of Transport header
81 * src: source port number
82 * dst: destination port number
84 struct flow_dissector_key_ports {
96 * struct flow_dissector_key_eth_addrs:
97 * @src: source Ethernet address
98 * @dst: destination Ethernet address
100 struct flow_dissector_key_eth_addrs {
101 /* (dst,src) must be grouped, in the same way than in ETH header */
102 unsigned char dst[ETH_ALEN];
103 unsigned char src[ETH_ALEN];
106 enum flow_dissector_key_id {
107 FLOW_DISSECTOR_KEY_CONTROL, /* struct flow_dissector_key_control */
108 FLOW_DISSECTOR_KEY_BASIC, /* struct flow_dissector_key_basic */
109 FLOW_DISSECTOR_KEY_IPV4_ADDRS, /* struct flow_dissector_key_ipv4_addrs */
110 FLOW_DISSECTOR_KEY_IPV6_ADDRS, /* struct flow_dissector_key_ipv6_addrs */
111 FLOW_DISSECTOR_KEY_PORTS, /* struct flow_dissector_key_ports */
112 FLOW_DISSECTOR_KEY_ETH_ADDRS, /* struct flow_dissector_key_eth_addrs */
113 FLOW_DISSECTOR_KEY_TIPC_ADDRS, /* struct flow_dissector_key_tipc_addrs */
114 FLOW_DISSECTOR_KEY_VLANID, /* struct flow_dissector_key_flow_tags */
115 FLOW_DISSECTOR_KEY_FLOW_LABEL, /* struct flow_dissector_key_flow_tags */
117 FLOW_DISSECTOR_KEY_MAX,
120 struct flow_dissector_key {
121 enum flow_dissector_key_id key_id;
122 size_t offset; /* offset of struct flow_dissector_key_*
123 in target the struct */
126 struct flow_dissector {
127 unsigned int used_keys; /* each bit repesents presence of one key id */
128 unsigned short int offset[FLOW_DISSECTOR_KEY_MAX];
131 void skb_flow_dissector_init(struct flow_dissector *flow_dissector,
132 const struct flow_dissector_key *key,
133 unsigned int key_count);
135 bool __skb_flow_dissect(const struct sk_buff *skb,
136 struct flow_dissector *flow_dissector,
137 void *target_container,
138 void *data, __be16 proto, int nhoff, int hlen);
140 static inline bool skb_flow_dissect(const struct sk_buff *skb,
141 struct flow_dissector *flow_dissector,
142 void *target_container)
144 return __skb_flow_dissect(skb, flow_dissector, target_container,
149 struct flow_dissector_key_control control;
150 #define FLOW_KEYS_HASH_START_FIELD basic
151 struct flow_dissector_key_basic basic;
152 struct flow_dissector_key_tags tags;
153 struct flow_dissector_key_ports ports;
154 struct flow_dissector_key_addrs addrs;
157 #define FLOW_KEYS_HASH_OFFSET \
158 offsetof(struct flow_keys, FLOW_KEYS_HASH_START_FIELD)
160 __be32 flow_get_u32_src(const struct flow_keys *flow);
161 __be32 flow_get_u32_dst(const struct flow_keys *flow);
163 extern struct flow_dissector flow_keys_dissector;
164 extern struct flow_dissector flow_keys_buf_dissector;
166 static inline bool skb_flow_dissect_flow_keys(const struct sk_buff *skb,
167 struct flow_keys *flow)
169 memset(flow, 0, sizeof(*flow));
170 return __skb_flow_dissect(skb, &flow_keys_dissector, flow,
174 static inline bool skb_flow_dissect_flow_keys_buf(struct flow_keys *flow,
175 void *data, __be16 proto,
178 memset(flow, 0, sizeof(*flow));
179 return __skb_flow_dissect(NULL, &flow_keys_buf_dissector, flow,
180 data, proto, nhoff, hlen);
183 __be32 __skb_flow_get_ports(const struct sk_buff *skb, int thoff, u8 ip_proto,
184 void *data, int hlen_proto);
186 static inline __be32 skb_flow_get_ports(const struct sk_buff *skb,
187 int thoff, u8 ip_proto)
189 return __skb_flow_get_ports(skb, thoff, ip_proto, NULL, 0);
192 u32 flow_hash_from_keys(struct flow_keys *keys);
193 void __skb_get_hash(struct sk_buff *skb);
194 u32 skb_get_poff(const struct sk_buff *skb);
195 u32 __skb_get_poff(const struct sk_buff *skb, void *data,
196 const struct flow_keys *keys, int hlen);
198 /* struct flow_keys_digest:
200 * This structure is used to hold a digest of the full flow keys. This is a
201 * larger "hash" of a flow to allow definitively matching specific flows where
202 * the 32 bit skb->hash is not large enough. The size is limited to 16 bytes so
203 * that it can by used in CB of skb (see sch_choke for an example).
205 #define FLOW_KEYS_DIGEST_LEN 16
206 struct flow_keys_digest {
207 u8 data[FLOW_KEYS_DIGEST_LEN];
210 void make_flow_keys_digest(struct flow_keys_digest *digest,
211 const struct flow_keys *flow);