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 {
18 * struct flow_dissector_key_basic:
19 * @thoff: Transport header offset
20 * @n_proto: Network header protocol (eg. IPv4/IPv6)
21 * @ip_proto: Transport header protocol (eg. TCP/UDP)
23 struct flow_dissector_key_basic {
29 struct flow_dissector_key_tags {
34 struct flow_dissector_key_keyid {
39 * struct flow_dissector_key_ipv4_addrs:
40 * @src: source ip address
41 * @dst: destination ip address
43 struct flow_dissector_key_ipv4_addrs {
44 /* (src,dst) must be grouped, in the same way than in IP header */
50 * struct flow_dissector_key_ipv6_addrs:
51 * @src: source ip address
52 * @dst: destination ip address
54 struct flow_dissector_key_ipv6_addrs {
55 /* (src,dst) must be grouped, in the same way than in IP header */
61 * struct flow_dissector_key_tipc_addrs:
62 * @srcnode: source node address
64 struct flow_dissector_key_tipc_addrs {
69 * struct flow_dissector_key_addrs:
70 * @v4addrs: IPv4 addresses
71 * @v6addrs: IPv6 addresses
73 struct flow_dissector_key_addrs {
75 struct flow_dissector_key_ipv4_addrs v4addrs;
76 struct flow_dissector_key_ipv6_addrs v6addrs;
77 struct flow_dissector_key_tipc_addrs tipcaddrs;
82 * flow_dissector_key_tp_ports:
83 * @ports: port numbers of Transport header
84 * src: source port number
85 * dst: destination port number
87 struct flow_dissector_key_ports {
99 * struct flow_dissector_key_eth_addrs:
100 * @src: source Ethernet address
101 * @dst: destination Ethernet address
103 struct flow_dissector_key_eth_addrs {
104 /* (dst,src) must be grouped, in the same way than in ETH header */
105 unsigned char dst[ETH_ALEN];
106 unsigned char src[ETH_ALEN];
109 enum flow_dissector_key_id {
110 FLOW_DISSECTOR_KEY_CONTROL, /* struct flow_dissector_key_control */
111 FLOW_DISSECTOR_KEY_BASIC, /* struct flow_dissector_key_basic */
112 FLOW_DISSECTOR_KEY_IPV4_ADDRS, /* struct flow_dissector_key_ipv4_addrs */
113 FLOW_DISSECTOR_KEY_IPV6_ADDRS, /* struct flow_dissector_key_ipv6_addrs */
114 FLOW_DISSECTOR_KEY_PORTS, /* struct flow_dissector_key_ports */
115 FLOW_DISSECTOR_KEY_ETH_ADDRS, /* struct flow_dissector_key_eth_addrs */
116 FLOW_DISSECTOR_KEY_TIPC_ADDRS, /* struct flow_dissector_key_tipc_addrs */
117 FLOW_DISSECTOR_KEY_VLANID, /* struct flow_dissector_key_flow_tags */
118 FLOW_DISSECTOR_KEY_FLOW_LABEL, /* struct flow_dissector_key_flow_tags */
119 FLOW_DISSECTOR_KEY_GRE_KEYID, /* struct flow_dissector_key_keyid */
120 FLOW_DISSECTOR_KEY_MPLS_ENTROPY, /* struct flow_dissector_key_keyid */
122 FLOW_DISSECTOR_KEY_MAX,
125 struct flow_dissector_key {
126 enum flow_dissector_key_id key_id;
127 size_t offset; /* offset of struct flow_dissector_key_*
128 in target the struct */
131 struct flow_dissector {
132 unsigned int used_keys; /* each bit repesents presence of one key id */
133 unsigned short int offset[FLOW_DISSECTOR_KEY_MAX];
137 struct flow_dissector_key_control control;
138 #define FLOW_KEYS_HASH_START_FIELD basic
139 struct flow_dissector_key_basic basic;
140 struct flow_dissector_key_tags tags;
141 struct flow_dissector_key_keyid keyid;
142 struct flow_dissector_key_ports ports;
143 struct flow_dissector_key_addrs addrs;
146 #define FLOW_KEYS_HASH_OFFSET \
147 offsetof(struct flow_keys, FLOW_KEYS_HASH_START_FIELD)
149 __be32 flow_get_u32_src(const struct flow_keys *flow);
150 __be32 flow_get_u32_dst(const struct flow_keys *flow);
152 extern struct flow_dissector flow_keys_dissector;
153 extern struct flow_dissector flow_keys_buf_dissector;
155 /* struct flow_keys_digest:
157 * This structure is used to hold a digest of the full flow keys. This is a
158 * larger "hash" of a flow to allow definitively matching specific flows where
159 * the 32 bit skb->hash is not large enough. The size is limited to 16 bytes so
160 * that it can by used in CB of skb (see sch_choke for an example).
162 #define FLOW_KEYS_DIGEST_LEN 16
163 struct flow_keys_digest {
164 u8 data[FLOW_KEYS_DIGEST_LEN];
167 void make_flow_keys_digest(struct flow_keys_digest *digest,
168 const struct flow_keys *flow);