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