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
24 struct 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
31 struct 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
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