filter.h (2216B)
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__ */