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Linux kernel mirror (for testing)
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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 * struct flow_dissector_key_control:
10 * @thoff: Transport header offset
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 * 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)
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 * struct flow_dissector_key_ipv4_addrs:
45 * @src: source ip address
46 * @dst: destination ip address
47 */
48struct flow_dissector_key_ipv4_addrs {
49 /* (src,dst) must be grouped, in the same way than in IP header */
50 __be32 src;
51 __be32 dst;
52};
53
54/**
55 * struct flow_dissector_key_ipv6_addrs:
56 * @src: source ip address
57 * @dst: destination ip address
58 */
59struct flow_dissector_key_ipv6_addrs {
60 /* (src,dst) must be grouped, in the same way than in IP header */
61 struct in6_addr src;
62 struct in6_addr dst;
63};
64
65/**
66 * struct flow_dissector_key_tipc_addrs:
67 * @srcnode: source node address
68 */
69struct flow_dissector_key_tipc_addrs {
70 __be32 srcnode;
71};
72
73/**
74 * struct flow_dissector_key_addrs:
75 * @v4addrs: IPv4 addresses
76 * @v6addrs: IPv6 addresses
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 * flow_dissector_key_tp_ports:
88 * @ports: port numbers of Transport header
89 * src: source port number
90 * dst: destination port number
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 * struct flow_dissector_key_eth_addrs:
105 * @src: source Ethernet address
106 * @dst: destination Ethernet address
107 */
108struct flow_dissector_key_eth_addrs {
109 /* (dst,src) must be grouped, in the same way than in ETH header */
110 unsigned char dst[ETH_ALEN];
111 unsigned char src[ETH_ALEN];
112};
113
114enum flow_dissector_key_id {
115 FLOW_DISSECTOR_KEY_CONTROL, /* struct flow_dissector_key_control */
116 FLOW_DISSECTOR_KEY_BASIC, /* struct flow_dissector_key_basic */
117 FLOW_DISSECTOR_KEY_IPV4_ADDRS, /* struct flow_dissector_key_ipv4_addrs */
118 FLOW_DISSECTOR_KEY_IPV6_ADDRS, /* struct flow_dissector_key_ipv6_addrs */
119 FLOW_DISSECTOR_KEY_PORTS, /* struct flow_dissector_key_ports */
120 FLOW_DISSECTOR_KEY_ETH_ADDRS, /* struct flow_dissector_key_eth_addrs */
121 FLOW_DISSECTOR_KEY_TIPC_ADDRS, /* struct flow_dissector_key_tipc_addrs */
122 FLOW_DISSECTOR_KEY_VLANID, /* struct flow_dissector_key_flow_tags */
123 FLOW_DISSECTOR_KEY_FLOW_LABEL, /* struct flow_dissector_key_flow_tags */
124 FLOW_DISSECTOR_KEY_GRE_KEYID, /* struct flow_dissector_key_keyid */
125 FLOW_DISSECTOR_KEY_MPLS_ENTROPY, /* struct flow_dissector_key_keyid */
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; /* offset of struct flow_dissector_key_*
138 in target the struct */
139};
140
141struct flow_dissector {
142 unsigned int used_keys; /* each bit repesents presence of one key id */
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/* struct flow_keys_digest:
166 *
167 * This structure is used to hold a digest of the full flow keys. This is a
168 * larger "hash" of a flow to allow definitively matching specific flows where
169 * the 32 bit skb->hash is not large enough. The size is limited to 16 bytes so
170 * that it can by used in CB of skb (see sch_choke for an example).
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