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