1/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
2/*
3 * Linux Socket Filter Data Structures
4 */
5
6#ifndef __LINUX_FILTER_H__
7#define __LINUX_FILTER_H__
8
9
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 *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 /* __LINUX_FILTER_H__ */
91