1/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
2/*
3 * Linux Socket Filter Data Structures
4 */
5
6#ifndef _UAPI__LINUX_FILTER_H__
7#define _UAPI__LINUX_FILTER_H__
8
9#include <linux/compiler.h>
10#include <linux/types.h>
11#include <linux/bpf_common.h>
12
13/*
14 * Current version of the filter code architecture.
15 */
16#define BPF_MAJOR_VERSION 1
17#define BPF_MINOR_VERSION 1
18
19/*
20 *	Try and keep these values and structures similar to BSD, especially
21 *	the BPF code definitions which need to match so you can share filters
22 */
23
24struct sock_filter {	/* Filter block */
25	__u16	code;   /* Actual filter code */
26	__u8	jt;	/* Jump true */
27	__u8	jf;	/* Jump false */
28	__u32	k;      /* Generic multiuse field */
29};
30
31struct sock_fprog {	/* Required for SO_ATTACH_FILTER. */
32	unsigned short		len;	/* Number of filter blocks */
33	struct sock_filter __user *filter;
34};
35
36/* ret - BPF_K and BPF_X also apply */
37#define BPF_RVAL(code)  ((code) & 0x18)
38#define         BPF_A           0x10
39
40/* misc */
41#define BPF_MISCOP(code) ((code) & 0xf8)
42#define         BPF_TAX         0x00
43#define         BPF_TXA         0x80
44
45/*
46 * Macros for filter block array initializers.
47 */
48#ifndef BPF_STMT
49#define BPF_STMT(code, k) { (unsigned short)(code), 0, 0, k }
50#endif
51#ifndef BPF_JUMP
52#define BPF_JUMP(code, k, jt, jf) { (unsigned short)(code), jt, jf, k }
53#endif
54
55/*
56 * Number of scratch memory words for: BPF_ST and BPF_STX
57 */
58#define BPF_MEMWORDS 16
59
60/* RATIONALE. Negative offsets are invalid in BPF.
61   We use them to reference ancillary data.
62   Unlike introduction new instructions, it does not break
63   existing compilers/optimizers.
64 */
65#define SKF_AD_OFF    (-0x1000)
66#define SKF_AD_PROTOCOL 0
67#define SKF_AD_PKTTYPE 	4
68#define SKF_AD_IFINDEX 	8
69#define SKF_AD_NLATTR	12
70#define SKF_AD_NLATTR_NEST	16
71#define SKF_AD_MARK 	20
72#define SKF_AD_QUEUE	24
73#define SKF_AD_HATYPE	28
74#define SKF_AD_RXHASH	32
75#define SKF_AD_CPU	36
76#define SKF_AD_ALU_XOR_X	40
77#define SKF_AD_VLAN_TAG	44
78#define SKF_AD_VLAN_TAG_PRESENT 48
79#define SKF_AD_PAY_OFFSET	52
80#define SKF_AD_RANDOM	56
81#define SKF_AD_VLAN_TPID	60
82#define SKF_AD_MAX	64
83
84#define SKF_NET_OFF	(-0x100000)
85#define SKF_LL_OFF	(-0x200000)
86
87#define BPF_NET_OFF	SKF_NET_OFF
88#define BPF_LL_OFF	SKF_LL_OFF
89
90#endif /* _UAPI__LINUX_FILTER_H__ */
91