1 #ifndef _NET_FLOW_DISSECTOR_H
2 #define _NET_FLOW_DISSECTOR_H
4 #include <linux/types.h>
6 #include <uapi/linux/if_ether.h>
9 * struct flow_dissector_key_control:
10 * @thoff: Transport header offset
12 struct flow_dissector_key_control {
20 * struct flow_dissector_key_basic:
21 * @thoff: Transport header offset
22 * @n_proto: Network header protocol (eg. IPv4/IPv6)
23 * @ip_proto: Transport header protocol (eg. TCP/UDP)
25 struct flow_dissector_key_basic {
31 struct flow_dissector_key_tags {
36 struct flow_dissector_key_keyid {
41 * struct flow_dissector_key_ipv4_addrs:
42 * @src: source ip address
43 * @dst: destination ip address
45 struct flow_dissector_key_ipv4_addrs {
46 /* (src,dst) must be grouped, in the same way than in IP header */
52 * struct flow_dissector_key_ipv6_addrs:
53 * @src: source ip address
54 * @dst: destination ip address
56 struct flow_dissector_key_ipv6_addrs {
57 /* (src,dst) must be grouped, in the same way than in IP header */
63 * struct flow_dissector_key_tipc_addrs:
64 * @srcnode: source node address
66 struct flow_dissector_key_tipc_addrs {
71 * struct flow_dissector_key_addrs:
72 * @v4addrs: IPv4 addresses
73 * @v6addrs: IPv6 addresses
75 struct flow_dissector_key_addrs {
77 struct flow_dissector_key_ipv4_addrs v4addrs;
78 struct flow_dissector_key_ipv6_addrs v6addrs;
79 struct flow_dissector_key_tipc_addrs tipcaddrs;
84 * flow_dissector_key_tp_ports:
85 * @ports: port numbers of Transport header
86 * src: source port number
87 * dst: destination port number
89 struct flow_dissector_key_ports {
101 * struct flow_dissector_key_eth_addrs:
102 * @src: source Ethernet address
103 * @dst: destination Ethernet address
105 struct flow_dissector_key_eth_addrs {
106 /* (dst,src) must be grouped, in the same way than in ETH header */
107 unsigned char dst[ETH_ALEN];
108 unsigned char src[ETH_ALEN];
111 enum flow_dissector_key_id {
112 FLOW_DISSECTOR_KEY_CONTROL, /* struct flow_dissector_key_control */
113 FLOW_DISSECTOR_KEY_BASIC, /* struct flow_dissector_key_basic */
114 FLOW_DISSECTOR_KEY_IPV4_ADDRS, /* struct flow_dissector_key_ipv4_addrs */
115 FLOW_DISSECTOR_KEY_IPV6_ADDRS, /* struct flow_dissector_key_ipv6_addrs */
116 FLOW_DISSECTOR_KEY_PORTS, /* struct flow_dissector_key_ports */
117 FLOW_DISSECTOR_KEY_ETH_ADDRS, /* struct flow_dissector_key_eth_addrs */
118 FLOW_DISSECTOR_KEY_TIPC_ADDRS, /* struct flow_dissector_key_tipc_addrs */
119 FLOW_DISSECTOR_KEY_VLANID, /* struct flow_dissector_key_flow_tags */
120 FLOW_DISSECTOR_KEY_FLOW_LABEL, /* struct flow_dissector_key_flow_tags */
121 FLOW_DISSECTOR_KEY_GRE_KEYID, /* struct flow_dissector_key_keyid */
122 FLOW_DISSECTOR_KEY_MPLS_ENTROPY, /* struct flow_dissector_key_keyid */
124 FLOW_DISSECTOR_KEY_MAX,
127 #define FLOW_DISSECTOR_F_PARSE_1ST_FRAG BIT(0)
128 #define FLOW_DISSECTOR_F_STOP_AT_L3 BIT(1)
130 struct flow_dissector_key {
131 enum flow_dissector_key_id key_id;
132 size_t offset; /* offset of struct flow_dissector_key_*
133 in target the struct */
136 struct flow_dissector {
137 unsigned int used_keys; /* each bit repesents presence of one key id */
138 unsigned short int offset[FLOW_DISSECTOR_KEY_MAX];
142 struct flow_dissector_key_control control;
143 #define FLOW_KEYS_HASH_START_FIELD basic
144 struct flow_dissector_key_basic basic;
145 struct flow_dissector_key_tags tags;
146 struct flow_dissector_key_keyid keyid;
147 struct flow_dissector_key_ports ports;
148 struct flow_dissector_key_addrs addrs;
151 #define FLOW_KEYS_HASH_OFFSET \
152 offsetof(struct flow_keys, FLOW_KEYS_HASH_START_FIELD)
154 __be32 flow_get_u32_src(const struct flow_keys *flow);
155 __be32 flow_get_u32_dst(const struct flow_keys *flow);
157 extern struct flow_dissector flow_keys_dissector;
158 extern struct flow_dissector flow_keys_buf_dissector;
160 /* struct flow_keys_digest:
162 * This structure is used to hold a digest of the full flow keys. This is a
163 * larger "hash" of a flow to allow definitively matching specific flows where
164 * the 32 bit skb->hash is not large enough. The size is limited to 16 bytes so
165 * that it can by used in CB of skb (see sch_choke for an example).
167 #define FLOW_KEYS_DIGEST_LEN 16
168 struct flow_keys_digest {
169 u8 data[FLOW_KEYS_DIGEST_LEN];
172 void make_flow_keys_digest(struct flow_keys_digest *digest,
173 const struct flow_keys *flow);
175 static inline bool flow_keys_have_l4(struct flow_keys *keys)
177 return (keys->ports.ports || keys->tags.flow_label);
180 u32 flow_hash_from_keys(struct flow_keys *keys);