1/*
2 * Linux Socket Filter Data Structures
3 */
4
5#ifndef __LINUX_FILTER_H__
6#define __LINUX_FILTER_H__
7
8
9#include <linux/types.h>
10#include <linux/bpf_common.h>
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 *filter;
33};
34
35/* ret - BPF_K and BPF_X also apply */
36#define BPF_RVAL(code)  ((code) & 0x18)
37#define         BPF_A           0x10
38
39/* misc */
40#define BPF_MISCOP(code) ((code) & 0xf8)
41#define         BPF_TAX         0x00
42#define         BPF_TXA         0x80
43
44/*
45 * Macros for filter block array initializers.
46 */
47#ifndef BPF_STMT
48#define BPF_STMT(code, k) { (unsigned short)(code), 0, 0, k }
49#endif
50#ifndef BPF_JUMP
51#define BPF_JUMP(code, k, jt, jf) { (unsigned short)(code), jt, jf, k }
52#endif
53
54/*
55 * Number of scratch memory words for: BPF_ST and BPF_STX
56 */
57#define BPF_MEMWORDS 16
58
59/* RATIONALE. Negative offsets are invalid in BPF.
60   We use them to reference ancillary data.
61   Unlike introduction new instructions, it does not break
62   existing compilers/optimizers.
63 */
64#define SKF_AD_OFF    (-0x1000)
65#define SKF_AD_PROTOCOL 0
66#define SKF_AD_PKTTYPE 	4
67#define SKF_AD_IFINDEX 	8
68#define SKF_AD_NLATTR	12
69#define SKF_AD_NLATTR_NEST	16
70#define SKF_AD_MARK 	20
71#define SKF_AD_QUEUE	24
72#define SKF_AD_HATYPE	28
73#define SKF_AD_RXHASH	32
74#define SKF_AD_CPU	36
75#define SKF_AD_ALU_XOR_X	40
76#define SKF_AD_VLAN_TAG	44
77#define SKF_AD_VLAN_TAG_PRESENT 48
78#define SKF_AD_PAY_OFFSET	52
79#define SKF_AD_RANDOM	56
80#define SKF_AD_VLAN_TPID	60
81#define SKF_AD_MAX	64
82
83#define SKF_NET_OFF	(-0x100000)
84#define SKF_LL_OFF	(-0x200000)
85
86#define BPF_NET_OFF	SKF_NET_OFF
87#define BPF_LL_OFF	SKF_LL_OFF
88
89#endif /* __LINUX_FILTER_H__ */
90