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ba914908 | 1 | /* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */ |
5cf35d6a SH |
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> | |
dddfc7f6 | 11 | #include <linux/bpf_common.h> |
5cf35d6a SH |
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 | ||
5cf35d6a SH |
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 | ||
5cf35d6a SH |
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 | |
fd5c1d43 | 80 | #define SKF_AD_RANDOM 56 |
cbdc3ed8 SH |
81 | #define SKF_AD_VLAN_TPID 60 |
82 | #define SKF_AD_MAX 64 | |
5cf35d6a | 83 | |
aeedd8e1 SH |
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 | |
5cf35d6a SH |
89 | |
90 | #endif /* __LINUX_FILTER_H__ */ |