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 {
35 struct flow_dissector_key_keyid {
40 * struct flow_dissector_key_ipv4_addrs:
41 * @src: source ip address
42 * @dst: destination ip address
44 struct flow_dissector_key_ipv4_addrs {
45 /* (src,dst) must be grouped, in the same way than in IP header */
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_tipc_addrs:
63 * @srcnode: source node address
65 struct flow_dissector_key_tipc_addrs {
70 * struct flow_dissector_key_addrs:
71 * @v4addrs: IPv4 addresses
72 * @v6addrs: IPv6 addresses
74 struct flow_dissector_key_addrs {
76 struct flow_dissector_key_ipv4_addrs v4addrs;
77 struct flow_dissector_key_ipv6_addrs v6addrs;
78 struct flow_dissector_key_tipc_addrs tipcaddrs;
83 * flow_dissector_key_tp_ports:
84 * @ports: port numbers of Transport header
85 * src: source port number
86 * dst: destination port number
88 struct flow_dissector_key_ports {
100 * struct flow_dissector_key_eth_addrs:
101 * @src: source Ethernet address
102 * @dst: destination Ethernet address
104 struct flow_dissector_key_eth_addrs {
105 /* (dst,src) must be grouped, in the same way than in ETH header */
106 unsigned char dst[ETH_ALEN];
107 unsigned char src[ETH_ALEN];
110 enum flow_dissector_key_id {
111 FLOW_DISSECTOR_KEY_CONTROL, /* struct flow_dissector_key_control */
112 FLOW_DISSECTOR_KEY_BASIC, /* struct flow_dissector_key_basic */
113 FLOW_DISSECTOR_KEY_IPV4_ADDRS, /* struct flow_dissector_key_ipv4_addrs */
114 FLOW_DISSECTOR_KEY_IPV6_ADDRS, /* struct flow_dissector_key_ipv6_addrs */
115 FLOW_DISSECTOR_KEY_PORTS, /* struct flow_dissector_key_ports */
116 FLOW_DISSECTOR_KEY_ETH_ADDRS, /* struct flow_dissector_key_eth_addrs */
117 FLOW_DISSECTOR_KEY_TIPC_ADDRS, /* struct flow_dissector_key_tipc_addrs */
118 FLOW_DISSECTOR_KEY_VLANID, /* struct flow_dissector_key_flow_tags */
119 FLOW_DISSECTOR_KEY_FLOW_LABEL, /* struct flow_dissector_key_flow_tags */
120 FLOW_DISSECTOR_KEY_GRE_KEYID, /* struct flow_dissector_key_keyid */
121 FLOW_DISSECTOR_KEY_MPLS_ENTROPY, /* struct flow_dissector_key_keyid */
123 FLOW_DISSECTOR_KEY_MAX,
126 struct flow_dissector_key {
127 enum flow_dissector_key_id key_id;
128 size_t offset; /* offset of struct flow_dissector_key_*
129 in target the struct */
132 struct flow_dissector {
133 unsigned int used_keys; /* each bit repesents presence of one key id */
134 unsigned short int offset[FLOW_DISSECTOR_KEY_MAX];
137 void skb_flow_dissector_init(struct flow_dissector *flow_dissector,
138 const struct flow_dissector_key *key,
139 unsigned int key_count);
141 bool __skb_flow_dissect(const struct sk_buff *skb,
142 struct flow_dissector *flow_dissector,
143 void *target_container,
144 void *data, __be16 proto, int nhoff, int hlen);
146 static inline bool skb_flow_dissect(const struct sk_buff *skb,
147 struct flow_dissector *flow_dissector,
148 void *target_container)
150 return __skb_flow_dissect(skb, flow_dissector, target_container,
155 struct flow_dissector_key_control control;
156 #define FLOW_KEYS_HASH_START_FIELD basic
157 struct flow_dissector_key_basic basic;
158 struct flow_dissector_key_tags tags;
159 struct flow_dissector_key_keyid keyid;
160 struct flow_dissector_key_ports ports;
161 struct flow_dissector_key_addrs addrs;
164 #define FLOW_KEYS_HASH_OFFSET \
165 offsetof(struct flow_keys, FLOW_KEYS_HASH_START_FIELD)
167 __be32 flow_get_u32_src(const struct flow_keys *flow);
168 __be32 flow_get_u32_dst(const struct flow_keys *flow);
170 extern struct flow_dissector flow_keys_dissector;
171 extern struct flow_dissector flow_keys_buf_dissector;
173 static inline bool skb_flow_dissect_flow_keys(const struct sk_buff *skb,
174 struct flow_keys *flow)
176 memset(flow, 0, sizeof(*flow));
177 return __skb_flow_dissect(skb, &flow_keys_dissector, flow,
181 static inline bool skb_flow_dissect_flow_keys_buf(struct flow_keys *flow,
182 void *data, __be16 proto,
185 memset(flow, 0, sizeof(*flow));
186 return __skb_flow_dissect(NULL, &flow_keys_buf_dissector, flow,
187 data, proto, nhoff, hlen);
190 __be32 __skb_flow_get_ports(const struct sk_buff *skb, int thoff, u8 ip_proto,
191 void *data, int hlen_proto);
193 static inline __be32 skb_flow_get_ports(const struct sk_buff *skb,
194 int thoff, u8 ip_proto)
196 return __skb_flow_get_ports(skb, thoff, ip_proto, NULL, 0);
199 u32 flow_hash_from_keys(struct flow_keys *keys);
200 void __skb_get_hash(struct sk_buff *skb);
201 u32 skb_get_poff(const struct sk_buff *skb);
202 u32 __skb_get_poff(const struct sk_buff *skb, void *data,
203 const struct flow_keys *keys, int hlen);
205 /* struct flow_keys_digest:
207 * This structure is used to hold a digest of the full flow keys. This is a
208 * larger "hash" of a flow to allow definitively matching specific flows where
209 * the 32 bit skb->hash is not large enough. The size is limited to 16 bytes so
210 * that it can by used in CB of skb (see sch_choke for an example).
212 #define FLOW_KEYS_DIGEST_LEN 16
213 struct flow_keys_digest {
214 u8 data[FLOW_KEYS_DIGEST_LEN];
217 void make_flow_keys_digest(struct flow_keys_digest *digest,
218 const struct flow_keys *flow);