summaryrefslogtreecommitdiff
path: root/include/net/flow_dissector.h
blob: fc3dce730a6bb245718640066b903cb412299eb0 (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
#ifndef _NET_FLOW_DISSECTOR_H
#define _NET_FLOW_DISSECTOR_H

#include <linux/types.h>
#include <linux/in6.h>
#include <uapi/linux/if_ether.h>

/**
 * struct flow_dissector_key_control:
 * @thoff: Transport header offset
 */
struct flow_dissector_key_control {
	u16	thoff;
	u16	addr_type;
	u32	flags;
};

#define FLOW_DIS_IS_FRAGMENT	BIT(0)
#define FLOW_DIS_FIRST_FRAG	BIT(1)
#define FLOW_DIS_ENCAPSULATION	BIT(2)

enum flow_dissect_ret {
	FLOW_DISSECT_RET_OUT_GOOD,
	FLOW_DISSECT_RET_OUT_BAD,
	FLOW_DISSECT_RET_PROTO_AGAIN,
	FLOW_DISSECT_RET_IPPROTO_AGAIN,
	FLOW_DISSECT_RET_CONTINUE,
};

/**
 * struct flow_dissector_key_basic:
 * @thoff: Transport header offset
 * @n_proto: Network header protocol (eg. IPv4/IPv6)
 * @ip_proto: Transport header protocol (eg. TCP/UDP)
 */
struct flow_dissector_key_basic {
	__be16	n_proto;
	u8	ip_proto;
	u8	padding;
};

struct flow_dissector_key_tags {
	u32	flow_label;
};

struct flow_dissector_key_vlan {
	u16	vlan_id:12,
		vlan_priority:3;
	u16	padding;
};

struct flow_dissector_key_mpls {
	u32	mpls_ttl:8,
		mpls_bos:1,
		mpls_tc:3,
		mpls_label:20;
};

struct flow_dissector_key_keyid {
	__be32	keyid;
};

/**
 * struct flow_dissector_key_ipv4_addrs:
 * @src: source ip address
 * @dst: destination ip address
 */
struct flow_dissector_key_ipv4_addrs {
	/* (src,dst) must be grouped, in the same way than in IP header */
	__be32 src;
	__be32 dst;
};

/**
 * struct flow_dissector_key_ipv6_addrs:
 * @src: source ip address
 * @dst: destination ip address
 */
struct flow_dissector_key_ipv6_addrs {
	/* (src,dst) must be grouped, in the same way than in IP header */
	struct in6_addr src;
	struct in6_addr dst;
};

/**
 * struct flow_dissector_key_tipc_addrs:
 * @srcnode: source node address
 */
struct flow_dissector_key_tipc_addrs {
	__be32 srcnode;
};

/**
 * struct flow_dissector_key_addrs:
 * @v4addrs: IPv4 addresses
 * @v6addrs: IPv6 addresses
 */
struct flow_dissector_key_addrs {
	union {
		struct flow_dissector_key_ipv4_addrs v4addrs;
		struct flow_dissector_key_ipv6_addrs v6addrs;
		struct flow_dissector_key_tipc_addrs tipcaddrs;
	};
};

/**
 * flow_dissector_key_arp:
 *	@ports: Operation, source and target addresses for an ARP header
 *              for Ethernet hardware addresses and IPv4 protocol addresses
 *		sip: Sender IP address
 *		tip: Target IP address
 *		op:  Operation
 *		sha: Sender hardware address
 *		tpa: Target hardware address
 */
struct flow_dissector_key_arp {
	__u32 sip;
	__u32 tip;
	__u8 op;
	unsigned char sha[ETH_ALEN];
	unsigned char tha[ETH_ALEN];
};

/**
 * flow_dissector_key_tp_ports:
 *	@ports: port numbers of Transport header
 *		src: source port number
 *		dst: destination port number
 */
struct flow_dissector_key_ports {
	union {
		__be32 ports;
		struct {
			__be16 src;
			__be16 dst;
		};
	};
};

/**
 * flow_dissector_key_icmp:
 *	@ports: type and code of ICMP header
 *		icmp: ICMP type (high) and code (low)
 *		type: ICMP type
 *		code: ICMP code
 */
struct flow_dissector_key_icmp {
	union {
		__be16 icmp;
		struct {
			u8 type;
			u8 code;
		};
	};
};

/**
 * struct flow_dissector_key_eth_addrs:
 * @src: source Ethernet address
 * @dst: destination Ethernet address
 */
struct flow_dissector_key_eth_addrs {
	/* (dst,src) must be grouped, in the same way than in ETH header */
	unsigned char dst[ETH_ALEN];
	unsigned char src[ETH_ALEN];
};

/**
 * struct flow_dissector_key_tcp:
 * @flags: flags
 */
struct flow_dissector_key_tcp {
	__be16 flags;
};

/**
 * struct flow_dissector_key_ip:
 * @tos: tos
 * @ttl: ttl
 */
struct flow_dissector_key_ip {
	__u8	tos;
	__u8	ttl;
};

enum flow_dissector_key_id {
	FLOW_DISSECTOR_KEY_CONTROL, /* struct flow_dissector_key_control */
	FLOW_DISSECTOR_KEY_BASIC, /* struct flow_dissector_key_basic */
	FLOW_DISSECTOR_KEY_IPV4_ADDRS, /* struct flow_dissector_key_ipv4_addrs */
	FLOW_DISSECTOR_KEY_IPV6_ADDRS, /* struct flow_dissector_key_ipv6_addrs */
	FLOW_DISSECTOR_KEY_PORTS, /* struct flow_dissector_key_ports */
	FLOW_DISSECTOR_KEY_ICMP, /* struct flow_dissector_key_icmp */
	FLOW_DISSECTOR_KEY_ETH_ADDRS, /* struct flow_dissector_key_eth_addrs */
	FLOW_DISSECTOR_KEY_TIPC_ADDRS, /* struct flow_dissector_key_tipc_addrs */
	FLOW_DISSECTOR_KEY_ARP, /* struct flow_dissector_key_arp */
	FLOW_DISSECTOR_KEY_VLAN, /* struct flow_dissector_key_flow_vlan */
	FLOW_DISSECTOR_KEY_FLOW_LABEL, /* struct flow_dissector_key_flow_tags */
	FLOW_DISSECTOR_KEY_GRE_KEYID, /* struct flow_dissector_key_keyid */
	FLOW_DISSECTOR_KEY_MPLS_ENTROPY, /* struct flow_dissector_key_keyid */
	FLOW_DISSECTOR_KEY_ENC_KEYID, /* struct flow_dissector_key_keyid */
	FLOW_DISSECTOR_KEY_ENC_IPV4_ADDRS, /* struct flow_dissector_key_ipv4_addrs */
	FLOW_DISSECTOR_KEY_ENC_IPV6_ADDRS, /* struct flow_dissector_key_ipv6_addrs */
	FLOW_DISSECTOR_KEY_ENC_CONTROL, /* struct flow_dissector_key_control */
	FLOW_DISSECTOR_KEY_ENC_PORTS, /* struct flow_dissector_key_ports */
	FLOW_DISSECTOR_KEY_MPLS, /* struct flow_dissector_key_mpls */
	FLOW_DISSECTOR_KEY_TCP, /* struct flow_dissector_key_tcp */
	FLOW_DISSECTOR_KEY_IP, /* struct flow_dissector_key_ip */

	FLOW_DISSECTOR_KEY_MAX,
};

#define FLOW_DISSECTOR_F_PARSE_1ST_FRAG		BIT(0)
#define FLOW_DISSECTOR_F_STOP_AT_L3		BIT(1)
#define FLOW_DISSECTOR_F_STOP_AT_FLOW_LABEL	BIT(2)
#define FLOW_DISSECTOR_F_STOP_AT_ENCAP		BIT(3)

struct flow_dissector_key {
	enum flow_dissector_key_id key_id;
	size_t offset; /* offset of struct flow_dissector_key_*
			  in target the struct */
};

struct flow_dissector {
	unsigned int used_keys; /* each bit repesents presence of one key id */
	unsigned short int offset[FLOW_DISSECTOR_KEY_MAX];
};

struct flow_keys {
	struct flow_dissector_key_control control;
#define FLOW_KEYS_HASH_START_FIELD basic
	struct flow_dissector_key_basic basic;
	struct flow_dissector_key_tags tags;
	struct flow_dissector_key_vlan vlan;
	struct flow_dissector_key_keyid keyid;
	struct flow_dissector_key_ports ports;
	struct flow_dissector_key_addrs addrs;
};

#define FLOW_KEYS_HASH_OFFSET		\
	offsetof(struct flow_keys, FLOW_KEYS_HASH_START_FIELD)

__be32 flow_get_u32_src(const struct flow_keys *flow);
__be32 flow_get_u32_dst(const struct flow_keys *flow);

extern struct flow_dissector flow_keys_dissector;
extern struct flow_dissector flow_keys_buf_dissector;

/* struct flow_keys_digest:
 *
 * This structure is used to hold a digest of the full flow keys. This is a
 * larger "hash" of a flow to allow definitively matching specific flows where
 * the 32 bit skb->hash is not large enough. The size is limited to 16 bytes so
 * that it can by used in CB of skb (see sch_choke for an example).
 */
#define FLOW_KEYS_DIGEST_LEN	16
struct flow_keys_digest {
	u8	data[FLOW_KEYS_DIGEST_LEN];
};

void make_flow_keys_digest(struct flow_keys_digest *digest,
			   const struct flow_keys *flow);

static inline bool flow_keys_have_l4(const struct flow_keys *keys)
{
	return (keys->ports.ports || keys->tags.flow_label);
}

u32 flow_hash_from_keys(struct flow_keys *keys);

static inline bool dissector_uses_key(const struct flow_dissector *flow_dissector,
				      enum flow_dissector_key_id key_id)
{
	return flow_dissector->used_keys & (1 << key_id);
}

static inline void *skb_flow_dissector_target(struct flow_dissector *flow_dissector,
					      enum flow_dissector_key_id key_id,
					      void *target_container)
{
	return ((char *)target_container) + flow_dissector->offset[key_id];
}

#endif