1#ifndef _NET_FLOW_DISSECTOR_H
2#define _NET_FLOW_DISSECTOR_H
3
4#include <linux/types.h>
5#include <linux/in6.h>
6#include <uapi/linux/if_ether.h>
7
8
9
10
11
12struct flow_dissector_key_control {
13 u16 thoff;
14 u16 addr_type;
15 u32 flags;
16};
17
18#define FLOW_DIS_IS_FRAGMENT BIT(0)
19#define FLOW_DIS_FIRST_FRAG BIT(1)
20#define FLOW_DIS_ENCAPSULATION BIT(2)
21
22
23
24
25
26
27
28struct flow_dissector_key_basic {
29 __be16 n_proto;
30 u8 ip_proto;
31 u8 padding;
32};
33
34struct flow_dissector_key_tags {
35 u32 vlan_id:12,
36 flow_label:20;
37};
38
39struct flow_dissector_key_keyid {
40 __be32 keyid;
41};
42
43
44
45
46
47
48struct flow_dissector_key_ipv4_addrs {
49
50 __be32 src;
51 __be32 dst;
52};
53
54
55
56
57
58
59struct flow_dissector_key_ipv6_addrs {
60
61 struct in6_addr src;
62 struct in6_addr dst;
63};
64
65
66
67
68
69struct flow_dissector_key_tipc_addrs {
70 __be32 srcnode;
71};
72
73
74
75
76
77
78struct flow_dissector_key_addrs {
79 union {
80 struct flow_dissector_key_ipv4_addrs v4addrs;
81 struct flow_dissector_key_ipv6_addrs v6addrs;
82 struct flow_dissector_key_tipc_addrs tipcaddrs;
83 };
84};
85
86
87
88
89
90
91
92struct flow_dissector_key_ports {
93 union {
94 __be32 ports;
95 struct {
96 __be16 src;
97 __be16 dst;
98 };
99 };
100};
101
102
103
104
105
106
107
108struct flow_dissector_key_eth_addrs {
109
110 unsigned char dst[ETH_ALEN];
111 unsigned char src[ETH_ALEN];
112};
113
114enum flow_dissector_key_id {
115 FLOW_DISSECTOR_KEY_CONTROL,
116 FLOW_DISSECTOR_KEY_BASIC,
117 FLOW_DISSECTOR_KEY_IPV4_ADDRS,
118 FLOW_DISSECTOR_KEY_IPV6_ADDRS,
119 FLOW_DISSECTOR_KEY_PORTS,
120 FLOW_DISSECTOR_KEY_ETH_ADDRS,
121 FLOW_DISSECTOR_KEY_TIPC_ADDRS,
122 FLOW_DISSECTOR_KEY_VLANID,
123 FLOW_DISSECTOR_KEY_FLOW_LABEL,
124 FLOW_DISSECTOR_KEY_GRE_KEYID,
125 FLOW_DISSECTOR_KEY_MPLS_ENTROPY,
126
127 FLOW_DISSECTOR_KEY_MAX,
128};
129
130#define FLOW_DISSECTOR_F_PARSE_1ST_FRAG BIT(0)
131#define FLOW_DISSECTOR_F_STOP_AT_L3 BIT(1)
132#define FLOW_DISSECTOR_F_STOP_AT_FLOW_LABEL BIT(2)
133#define FLOW_DISSECTOR_F_STOP_AT_ENCAP BIT(3)
134
135struct flow_dissector_key {
136 enum flow_dissector_key_id key_id;
137 size_t offset;
138
139};
140
141struct flow_dissector {
142 unsigned int used_keys;
143 unsigned short int offset[FLOW_DISSECTOR_KEY_MAX];
144};
145
146struct flow_keys {
147 struct flow_dissector_key_control control;
148#define FLOW_KEYS_HASH_START_FIELD basic
149 struct flow_dissector_key_basic basic;
150 struct flow_dissector_key_tags tags;
151 struct flow_dissector_key_keyid keyid;
152 struct flow_dissector_key_ports ports;
153 struct flow_dissector_key_addrs addrs;
154};
155
156#define FLOW_KEYS_HASH_OFFSET \
157 offsetof(struct flow_keys, FLOW_KEYS_HASH_START_FIELD)
158
159__be32 flow_get_u32_src(const struct flow_keys *flow);
160__be32 flow_get_u32_dst(const struct flow_keys *flow);
161
162extern struct flow_dissector flow_keys_dissector;
163extern struct flow_dissector flow_keys_buf_dissector;
164
165
166
167
168
169
170
171
172#define FLOW_KEYS_DIGEST_LEN 16
173struct flow_keys_digest {
174 u8 data[FLOW_KEYS_DIGEST_LEN];
175};
176
177void make_flow_keys_digest(struct flow_keys_digest *digest,
178 const struct flow_keys *flow);
179
180static inline bool flow_keys_have_l4(struct flow_keys *keys)
181{
182 return (keys->ports.ports || keys->tags.flow_label);
183}
184
185u32 flow_hash_from_keys(struct flow_keys *keys);
186
187static inline bool dissector_uses_key(const struct flow_dissector *flow_dissector,
188 enum flow_dissector_key_id key_id)
189{
190 return flow_dissector->used_keys & (1 << key_id);
191}
192
193static inline void *skb_flow_dissector_target(struct flow_dissector *flow_dissector,
194 enum flow_dissector_key_id key_id,
195 void *target_container)
196{
197 return ((char *)target_container) + flow_dissector->offset[key_id];
198}
199
200#endif
201