1/*
2 * Linux Socket Filter Data Structures
3 */
4
5#ifndef _UAPI__LINUX_FILTER_H__
6#define _UAPI__LINUX_FILTER_H__
7
8#include <linux/compiler.h>
9#include <linux/types.h>
10
11
12/*
13 * Current version of the filter code architecture.
14 */
15#define BPF_MAJOR_VERSION 1
16#define BPF_MINOR_VERSION 1
17
18/*
19 *	Try and keep these values and structures similar to BSD, especially
20 *	the BPF code definitions which need to match so you can share filters
21 */
22
23struct sock_filter {	/* Filter block */
24	__u16	code;   /* Actual filter code */
25	__u8	jt;	/* Jump true */
26	__u8	jf;	/* Jump false */
27	__u32	k;      /* Generic multiuse field */
28};
29
30struct sock_fprog {	/* Required for SO_ATTACH_FILTER. */
31	unsigned short		len;	/* Number of filter blocks */
32	struct sock_filter __user *filter;
33};
34
35/*
36 * Instruction classes
37 */
38
39#define BPF_CLASS(code) ((code) & 0x07)
40#define         BPF_LD          0x00
41#define         BPF_LDX         0x01
42#define         BPF_ST          0x02
43#define         BPF_STX         0x03
44#define         BPF_ALU         0x04
45#define         BPF_JMP         0x05
46#define         BPF_RET         0x06
47#define         BPF_MISC        0x07
48
49/* ld/ldx fields */
50#define BPF_SIZE(code)  ((code) & 0x18)
51#define         BPF_W           0x00
52#define         BPF_H           0x08
53#define         BPF_B           0x10
54#define BPF_MODE(code)  ((code) & 0xe0)
55#define         BPF_IMM         0x00
56#define         BPF_ABS         0x20
57#define         BPF_IND         0x40
58#define         BPF_MEM         0x60
59#define         BPF_LEN         0x80
60#define         BPF_MSH         0xa0
61
62/* alu/jmp fields */
63#define BPF_OP(code)    ((code) & 0xf0)
64#define         BPF_ADD         0x00
65#define         BPF_SUB         0x10
66#define         BPF_MUL         0x20
67#define         BPF_DIV         0x30
68#define         BPF_OR          0x40
69#define         BPF_AND         0x50
70#define         BPF_LSH         0x60
71#define         BPF_RSH         0x70
72#define         BPF_NEG         0x80
73#define		BPF_MOD		0x90
74#define		BPF_XOR		0xa0
75
76#define         BPF_JA          0x00
77#define         BPF_JEQ         0x10
78#define         BPF_JGT         0x20
79#define         BPF_JGE         0x30
80#define         BPF_JSET        0x40
81#define BPF_SRC(code)   ((code) & 0x08)
82#define         BPF_K           0x00
83#define         BPF_X           0x08
84
85/* ret - BPF_K and BPF_X also apply */
86#define BPF_RVAL(code)  ((code) & 0x18)
87#define         BPF_A           0x10
88
89/* misc */
90#define BPF_MISCOP(code) ((code) & 0xf8)
91#define         BPF_TAX         0x00
92#define         BPF_TXA         0x80
93
94#ifndef BPF_MAXINSNS
95#define BPF_MAXINSNS 4096
96#endif
97
98/*
99 * Macros for filter block array initializers.
100 */
101#ifndef BPF_STMT
102#define BPF_STMT(code, k) { (unsigned short)(code), 0, 0, k }
103#endif
104#ifndef BPF_JUMP
105#define BPF_JUMP(code, k, jt, jf) { (unsigned short)(code), jt, jf, k }
106#endif
107
108/*
109 * Number of scratch memory words for: BPF_ST and BPF_STX
110 */
111#define BPF_MEMWORDS 16
112
113/* RATIONALE. Negative offsets are invalid in BPF.
114   We use them to reference ancillary data.
115   Unlike introduction new instructions, it does not break
116   existing compilers/optimizers.
117 */
118#define SKF_AD_OFF    (-0x1000)
119#define SKF_AD_PROTOCOL 0
120#define SKF_AD_PKTTYPE 	4
121#define SKF_AD_IFINDEX 	8
122#define SKF_AD_NLATTR	12
123#define SKF_AD_NLATTR_NEST	16
124#define SKF_AD_MARK 	20
125#define SKF_AD_QUEUE	24
126#define SKF_AD_HATYPE	28
127#define SKF_AD_RXHASH	32
128#define SKF_AD_CPU	36
129#define SKF_AD_ALU_XOR_X	40
130#define SKF_AD_VLAN_TAG	44
131#define SKF_AD_VLAN_TAG_PRESENT 48
132#define SKF_AD_PAY_OFFSET	52
133#define SKF_AD_MAX	56
134#define SKF_NET_OFF   (-0x100000)
135#define SKF_LL_OFF    (-0x200000)
136
137
138#endif /* _UAPI__LINUX_FILTER_H__ */
139