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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 | /* * Linux Socket Filter Data Structures */ #ifndef __LINUX_FILTER_H__ #define __LINUX_FILTER_H__ /* * Current version of the filter code architecture. */ #define BPF_MAJOR_VERSION 1 #define BPF_MINOR_VERSION 1 /* * Try and keep these values and structures similar to BSD, especially * the BPF code definitions which need to match so you can share filters */ struct sock_filter /* Filter block */ { __u16 code; /* Actual filter code */ __u8 jt; /* Jump true */ __u8 jf; /* Jump false */ __u32 k; /* Generic multiuse field */ }; struct sock_fprog /* Required for SO_ATTACH_FILTER. */ { unsigned short len; /* Number of filter blocks */ struct sock_filter *filter; }; #ifdef __KERNEL__ struct sk_filter { atomic_t refcnt; unsigned int len; /* Number of filter blocks */ struct sock_filter insns[0]; }; extern __inline__ unsigned int sk_filter_len(struct sk_filter *fp) { return fp->len*sizeof(struct sock_filter) + sizeof(*fp); } #endif /* * Instruction classes */ #define BPF_CLASS(code) ((code) & 0x07) #define BPF_LD 0x00 #define BPF_LDX 0x01 #define BPF_ST 0x02 #define BPF_STX 0x03 #define BPF_ALU 0x04 #define BPF_JMP 0x05 #define BPF_RET 0x06 #define BPF_MISC 0x07 /* ld/ldx fields */ #define BPF_SIZE(code) ((code) & 0x18) #define BPF_W 0x00 #define BPF_H 0x08 #define BPF_B 0x10 #define BPF_MODE(code) ((code) & 0xe0) #define BPF_IMM 0x00 #define BPF_ABS 0x20 #define BPF_IND 0x40 #define BPF_MEM 0x60 #define BPF_LEN 0x80 #define BPF_MSH 0xa0 /* alu/jmp fields */ #define BPF_OP(code) ((code) & 0xf0) #define BPF_ADD 0x00 #define BPF_SUB 0x10 #define BPF_MUL 0x20 #define BPF_DIV 0x30 #define BPF_OR 0x40 #define BPF_AND 0x50 #define BPF_LSH 0x60 #define BPF_RSH 0x70 #define BPF_NEG 0x80 #define BPF_JA 0x00 #define BPF_JEQ 0x10 #define BPF_JGT 0x20 #define BPF_JGE 0x30 #define BPF_JSET 0x40 #define BPF_SRC(code) ((code) & 0x08) #define BPF_K 0x00 #define BPF_X 0x08 /* ret - BPF_K and BPF_X also apply */ #define BPF_RVAL(code) ((code) & 0x18) #define BPF_A 0x10 /* misc */ #define BPF_MISCOP(code) ((code) & 0xf8) #define BPF_TAX 0x00 #define BPF_TXA 0x80 #ifndef BPF_MAXINSNS #define BPF_MAXINSNS 4096 #endif /* * Macros for filter block array initializers. */ #ifndef BPF_STMT #define BPF_STMT(code, k) { (unsigned short)(code), 0, 0, k } #endif #ifndef BPF_JUMP #define BPF_JUMP(code, k, jt, jf) { (unsigned short)(code), jt, jf, k } #endif /* * Number of scratch memory words for: BPF_ST and BPF_STX */ #define BPF_MEMWORDS 16 /* RATIONALE. Negative offsets are invalid in BPF. We use them to reference ancillary data. Unlike introduction new instructions, it does not break existing compilers/optimizers. */ #define SKF_AD_OFF (-0x1000) #define SKF_AD_PROTOCOL 0 #define SKF_AD_PKTTYPE 4 #define SKF_AD_IFINDEX 8 #define SKF_AD_MAX 12 #define SKF_NET_OFF (-0x100000) #define SKF_LL_OFF (-0x200000) #ifdef __KERNEL__ extern int sk_run_filter(struct sk_buff *skb, struct sock_filter *filter, int flen); extern int sk_attach_filter(struct sock_fprog *fprog, struct sock *sk); #endif /* __KERNEL__ */ #endif /* __LINUX_FILTER_H__ */ |