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 #define FLOW_DIS_IS_FRAGMENT BIT(0)
19 #define FLOW_DIS_FIRST_FRAG BIT(1)
20 #define FLOW_DIS_ENCAPSULATION BIT(2)
23 * struct flow_dissector_key_basic:
24 * @thoff: Transport header offset
25 * @n_proto: Network header protocol (eg. IPv4/IPv6)
26 * @ip_proto: Transport header protocol (eg. TCP/UDP)
28 struct flow_dissector_key_basic {
34 struct flow_dissector_key_tags {
38 struct flow_dissector_key_vlan {
44 struct flow_dissector_key_keyid {
49 * struct flow_dissector_key_ipv4_addrs:
50 * @src: source ip address
51 * @dst: destination ip address
53 struct flow_dissector_key_ipv4_addrs {
54 /* (src,dst) must be grouped, in the same way than in IP header */
60 * struct flow_dissector_key_ipv6_addrs:
61 * @src: source ip address
62 * @dst: destination ip address
64 struct flow_dissector_key_ipv6_addrs {
65 /* (src,dst) must be grouped, in the same way than in IP header */
71 * struct flow_dissector_key_tipc_addrs:
72 * @srcnode: source node address
74 struct flow_dissector_key_tipc_addrs {
79 * struct flow_dissector_key_addrs:
80 * @v4addrs: IPv4 addresses
81 * @v6addrs: IPv6 addresses
83 struct flow_dissector_key_addrs {
85 struct flow_dissector_key_ipv4_addrs v4addrs;
86 struct flow_dissector_key_ipv6_addrs v6addrs;
87 struct flow_dissector_key_tipc_addrs tipcaddrs;
92 * flow_dissector_key_tp_ports:
93 * @ports: port numbers of Transport header
94 * src: source port number
95 * dst: destination port number
97 struct flow_dissector_key_ports {
109 * struct flow_dissector_key_eth_addrs:
110 * @src: source Ethernet address
111 * @dst: destination Ethernet address
113 struct flow_dissector_key_eth_addrs {
114 /* (dst,src) must be grouped, in the same way than in ETH header */
115 unsigned char dst[ETH_ALEN];
116 unsigned char src[ETH_ALEN];
119 enum flow_dissector_key_id {
120 FLOW_DISSECTOR_KEY_CONTROL, /* struct flow_dissector_key_control */
121 FLOW_DISSECTOR_KEY_BASIC, /* struct flow_dissector_key_basic */
122 FLOW_DISSECTOR_KEY_IPV4_ADDRS, /* struct flow_dissector_key_ipv4_addrs */
123 FLOW_DISSECTOR_KEY_IPV6_ADDRS, /* struct flow_dissector_key_ipv6_addrs */
124 FLOW_DISSECTOR_KEY_PORTS, /* struct flow_dissector_key_ports */
125 FLOW_DISSECTOR_KEY_ETH_ADDRS, /* struct flow_dissector_key_eth_addrs */
126 FLOW_DISSECTOR_KEY_TIPC_ADDRS, /* struct flow_dissector_key_tipc_addrs */
127 FLOW_DISSECTOR_KEY_VLAN, /* struct flow_dissector_key_flow_vlan */
128 FLOW_DISSECTOR_KEY_FLOW_LABEL, /* struct flow_dissector_key_flow_tags */
129 FLOW_DISSECTOR_KEY_GRE_KEYID, /* struct flow_dissector_key_keyid */
130 FLOW_DISSECTOR_KEY_MPLS_ENTROPY, /* struct flow_dissector_key_keyid */
131 FLOW_DISSECTOR_KEY_ENC_KEYID, /* struct flow_dissector_key_keyid */
132 FLOW_DISSECTOR_KEY_ENC_IPV4_ADDRS, /* struct flow_dissector_key_ipv4_addrs */
133 FLOW_DISSECTOR_KEY_ENC_IPV6_ADDRS, /* struct flow_dissector_key_ipv6_addrs */
134 FLOW_DISSECTOR_KEY_ENC_CONTROL, /* struct flow_dissector_key_control */
135 FLOW_DISSECTOR_KEY_ENC_PORTS, /* struct flow_dissector_key_ports */
137 FLOW_DISSECTOR_KEY_MAX,
140 #define FLOW_DISSECTOR_F_PARSE_1ST_FRAG BIT(0)
141 #define FLOW_DISSECTOR_F_STOP_AT_L3 BIT(1)
142 #define FLOW_DISSECTOR_F_STOP_AT_FLOW_LABEL BIT(2)
143 #define FLOW_DISSECTOR_F_STOP_AT_ENCAP BIT(3)
145 struct flow_dissector_key {
146 enum flow_dissector_key_id key_id;
147 size_t offset; /* offset of struct flow_dissector_key_*
148 in target the struct */
151 struct flow_dissector {
152 unsigned int used_keys; /* each bit repesents presence of one key id */
153 unsigned short int offset[FLOW_DISSECTOR_KEY_MAX];
157 struct flow_dissector_key_control control;
158 #define FLOW_KEYS_HASH_START_FIELD basic
159 struct flow_dissector_key_basic basic;
160 struct flow_dissector_key_tags tags;
161 struct flow_dissector_key_vlan vlan;
162 struct flow_dissector_key_keyid keyid;
163 struct flow_dissector_key_ports ports;
164 struct flow_dissector_key_addrs addrs;
167 #define FLOW_KEYS_HASH_OFFSET \
168 offsetof(struct flow_keys, FLOW_KEYS_HASH_START_FIELD)
170 __be32 flow_get_u32_src(const struct flow_keys *flow);
171 __be32 flow_get_u32_dst(const struct flow_keys *flow);
173 extern struct flow_dissector flow_keys_dissector;
174 extern struct flow_dissector flow_keys_buf_dissector;
176 /* struct flow_keys_digest:
178 * This structure is used to hold a digest of the full flow keys. This is a
179 * larger "hash" of a flow to allow definitively matching specific flows where
180 * the 32 bit skb->hash is not large enough. The size is limited to 16 bytes so
181 * that it can by used in CB of skb (see sch_choke for an example).
183 #define FLOW_KEYS_DIGEST_LEN 16
184 struct flow_keys_digest {
185 u8 data[FLOW_KEYS_DIGEST_LEN];
188 void make_flow_keys_digest(struct flow_keys_digest *digest,
189 const struct flow_keys *flow);
191 static inline bool flow_keys_have_l4(const struct flow_keys *keys)
193 return (keys->ports.ports || keys->tags.flow_label);
196 u32 flow_hash_from_keys(struct flow_keys *keys);
198 static inline bool dissector_uses_key(const struct flow_dissector *flow_dissector,
199 enum flow_dissector_key_id key_id)
201 return flow_dissector->used_keys & (1 << key_id);
204 static inline void *skb_flow_dissector_target(struct flow_dissector *flow_dissector,
205 enum flow_dissector_key_id key_id,
206 void *target_container)
208 return ((char *)target_container) + flow_dissector->offset[key_id];