1 /*- 2 * Copyright (c) 1990 The Regents of the University of California. 3 * All rights reserved. 4 * 5 * This code is derived from the Stanford/CMU enet packet filter, 6 * (net/enet.c) distributed as part of 4.3BSD, and code contributed 7 * to Berkeley by Steven McCanne of Lawrence Berkeley Laboratory. 8 * 9 * %sccs.include.redist.c% 10 * 11 * @(#)bpf.h 7.1 (Berkeley) 05/07/91 12 * 13 * @(#) $Header: bpf.h,v 1.20 91/04/24 22:06:24 mccanne Locked $ (LBL) 14 */ 15 16 /* 17 * Alignment macros. BPF_WORDALIGN rounds up to the next 18 * even multiple of BPF_ALIGNMENT. 19 */ 20 #define BPF_ALIGNMENT sizeof(long) 21 #define BPF_WORDALIGN(x) (((x)+(BPF_ALIGNMENT-1))&~(BPF_ALIGNMENT-1)) 22 23 #define BPF_MAXINSNS 512 24 #define BPF_MAXBUFSIZE 0x8000 25 26 /* 27 * Structure for BIOCSETF. 28 */ 29 struct bpf_program { 30 u_int bf_len; 31 struct bpf_insn *bf_insns; 32 }; 33 34 /* 35 * Struct returned by BIOCGSTATS. 36 */ 37 struct bpf_stat { 38 u_int bs_recv; /* number of packets received */ 39 u_int bs_drop; /* number of packets dropped */ 40 }; 41 42 /* 43 * BPF ioctls 44 * 45 * The first set is for compatibility with Sun's pcc style 46 * header files. If your using gcc, we assume that you 47 * have run fixincludes so the latter set should work. 48 */ 49 #if defined(sun) && !defined(__GNUC__) 50 #define BIOCGFLEN _IOR(B,101, u_int) 51 #define BIOCGBLEN _IOR(B,102, u_int) 52 #define BIOCSETF _IOW(B,103, struct bpf_program) 53 #define BIOCFLUSH _IO(B,104) 54 #define BIOCPROMISC _IO(B,105) 55 #define BIOCGDLT _IOR(B,106, u_int) 56 #define BIOCGETIF _IOR(B,107, struct ifreq) 57 #define BIOCSETIF _IOW(B,108, struct ifreq) 58 #define BIOCSRTIMEOUT _IOW(B,109, struct timeval) 59 #define BIOCGRTIMEOUT _IOR(B,110, struct timeval) 60 #define BIOCGSTATS _IOR(B,111, struct bpf_stat) 61 #define BIOCIMMEDIATE _IOW(B,112, u_int) 62 #else 63 #define BIOCGFLEN _IOR('B',101, u_int) 64 #define BIOCGBLEN _IOR('B',102, u_int) 65 #define BIOCSETF _IOW('B',103, struct bpf_program) 66 #define BIOCFLUSH _IO('B',104) 67 #define BIOCPROMISC _IO('B',105) 68 #define BIOCGDLT _IOR('B',106, u_int) 69 #define BIOCGETIF _IOR('B',107, struct ifreq) 70 #define BIOCSETIF _IOW('B',108, struct ifreq) 71 #define BIOCSRTIMEOUT _IOW('B',109, struct timeval) 72 #define BIOCGRTIMEOUT _IOR('B',110, struct timeval) 73 #define BIOCGSTATS _IOR('B',111, struct bpf_stat) 74 #define BIOCIMMEDIATE _IOW('B',112, u_int) 75 #endif 76 77 /* 78 * Structure prepended to each packet. 79 */ 80 struct bpf_hdr { 81 struct timeval bh_tstamp; /* time stamp */ 82 u_long bh_caplen; /* length of captured portion */ 83 u_long bh_datalen; /* original length of packet */ 84 u_short bh_hdrlen; /* length of bpf header (this struct 85 plus alignment padding) */ 86 }; 87 /* 88 * Because the structure above is not a multiple of 4 bytes, some compilers 89 * will insist on inserting padding; hence, sizeof(struct bpf_hdr) won't work. 90 * Only the kernel needs to know about it; applications use bh_hdrlen. 91 */ 92 #ifdef KERNEL 93 #define SIZEOF_BPF_HDR 18 94 #endif 95 96 /* 97 * Data-link level type codes. 98 * Currently, only DLT_EN10MB and DLT_SLIP are supported. 99 */ 100 #define DLT_EN10MB 1 /* Ethernet (10Mb) */ 101 #define DLT_EN3MB 2 /* Experimental Ethernet (3Mb) */ 102 #define DLT_AX25 3 /* Amateur Radio AX.25 */ 103 #define DLT_PRONET 4 /* Proteon ProNET Token Ring */ 104 #define DLT_CHAOS 5 /* Chaos */ 105 #define DLT_IEEE802 6 /* IEEE 802 Networks */ 106 #define DLT_ARCNET 7 /* ARCNET */ 107 #define DLT_SLIP 8 /* Serial Line IP */ 108 #define DLT_PPP 9 /* Point-to-point Protocol */ 109 #define DLT_FDDI 10 /* FDDI */ 110 111 /* 112 * The instruction encondings. 113 */ 114 /* classes <2:0> */ 115 #define BPF_CLASS(code) ((code) & 0x07) 116 #define BPF_LD 0x00 117 #define BPF_LDX 0x01 118 #define BPF_ST 0x02 119 #define BPF_STX 0x03 120 #define BPF_ALU 0x04 121 #define BPF_JMP 0x05 122 #define BPF_RET 0x06 123 #define BPF_MISC 0x07 124 125 /* ld/ldx fields */ 126 #define BPF_SIZE(code) ((code) & 0x18) 127 #define BPF_W 0x00 128 #define BPF_H 0x08 129 #define BPF_B 0x10 130 #define BPF_MODE(code) ((code) & 0xe0) 131 #define BPF_IMM 0x00 132 #define BPF_ABS 0x20 133 #define BPF_IND 0x40 134 #define BPF_MEM 0x60 135 #define BPF_LEN 0x80 136 #define BPF_MSH 0xa0 137 138 /* alu/jmp fields */ 139 #define BPF_OP(code) ((code) & 0xf0) 140 #define BPF_ADD 0x00 141 #define BPF_SUB 0x10 142 #define BPF_MUL 0x20 143 #define BPF_DIV 0x30 144 #define BPF_OR 0x40 145 #define BPF_AND 0x50 146 #define BPF_LSH 0x60 147 #define BPF_RSH 0x70 148 #define BPF_NEG 0x80 149 #define BPF_JA 0x00 150 #define BPF_JEQ 0x10 151 #define BPF_JGT 0x20 152 #define BPF_JGE 0x30 153 #define BPF_JSET 0x40 154 #define BPF_SRC(code) ((code) & 0x08) 155 #define BPF_K 0x00 156 #define BPF_X 0x08 157 158 /* ret - BPF_K and BPF_X also apply */ 159 #define BPF_RVAL(code) ((code) & 0x18) 160 #define BPF_A 0x10 161 162 /* misc */ 163 #define BPF_MISCOP(code) ((code) & 0xf8) 164 #define BPF_TAX 0x00 165 #define BPF_TXA 0x80 166 167 /* 168 * The instruction data structure. 169 */ 170 struct bpf_insn { 171 u_short code; 172 u_char jt; 173 u_char jf; 174 long k; 175 }; 176 177 /* 178 * Macros for insn array initializers. 179 */ 180 #define BPF_STMT(code, k) { (u_short)(code), 0, 0, k } 181 #define BPF_JUMP(code, k, jt, jf) { (u_short)(code), jt, jf, k } 182 183 #ifdef KERNEL 184 extern u_int bpf_filter(); 185 extern void bpfattach(); 186 extern void bpf_tap(); 187 extern void bpf_mtap(); 188 #endif 189 190 /* 191 * Number of scratch memory words (for BPF_LD|BPF_MEM and BPF_ST). 192 */ 193 #define BPF_MEMWORDS 16 194