1 /* 2 * Copyright (c) 1990, 1991 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 and Van Jacobson both of Lawrence 8 * Berkeley Laboratory. 9 * 10 * %sccs.include.redist.c% 11 * 12 * @(#)bpf.h 7.3 (Berkeley) 10/29/91 13 * 14 * @(#) $Header: bpf.h,v 1.24 91/10/27 21:22:32 mccanne Exp $ (LBL) 15 */ 16 17 /* 18 * Alignment macros. BPF_WORDALIGN rounds up to the next 19 * even multiple of BPF_ALIGNMENT. 20 */ 21 #define BPF_ALIGNMENT sizeof(long) 22 #define BPF_WORDALIGN(x) (((x)+(BPF_ALIGNMENT-1))&~(BPF_ALIGNMENT-1)) 23 24 #define BPF_MAXINSNS 512 25 #define BPF_MAXBUFSIZE 0x8000 26 27 /* 28 * Structure for BIOCSETF. 29 */ 30 struct bpf_program { 31 u_int bf_len; 32 struct bpf_insn *bf_insns; 33 }; 34 35 /* 36 * Struct returned by BIOCGSTATS. 37 */ 38 struct bpf_stat { 39 u_int bs_recv; /* number of packets received */ 40 u_int bs_drop; /* number of packets dropped */ 41 }; 42 43 /* 44 * BPF ioctls 45 * 46 * The first set is for compatibility with Sun's pcc style 47 * header files. If your using gcc, we assume that you 48 * have run fixincludes so the latter set should work. 49 */ 50 #if (defined(sun) || defined(ibm032)) && !defined(__GNUC__) 51 #define BIOCGBLEN _IOR(B,102, u_int) 52 #define BIOCSBLEN _IOWR(B,102, u_int) 53 #define BIOCSETF _IOW(B,103, struct bpf_program) 54 #define BIOCFLUSH _IO(B,104) 55 #define BIOCPROMISC _IO(B,105) 56 #define BIOCGDLT _IOR(B,106, u_int) 57 #define BIOCGETIF _IOR(B,107, struct ifreq) 58 #define BIOCSETIF _IOW(B,108, struct ifreq) 59 #define BIOCSRTIMEOUT _IOW(B,109, struct timeval) 60 #define BIOCGRTIMEOUT _IOR(B,110, struct timeval) 61 #define BIOCGSTATS _IOR(B,111, struct bpf_stat) 62 #define BIOCIMMEDIATE _IOW(B,112, u_int) 63 #else 64 #define BIOCGBLEN _IOR('B',102, u_int) 65 #define BIOCSBLEN _IOWR('B',102, u_int) 66 #define BIOCSETF _IOW('B',103, struct bpf_program) 67 #define BIOCFLUSH _IO('B',104) 68 #define BIOCPROMISC _IO('B',105) 69 #define BIOCGDLT _IOR('B',106, u_int) 70 #define BIOCGETIF _IOR('B',107, struct ifreq) 71 #define BIOCSETIF _IOW('B',108, struct ifreq) 72 #define BIOCSRTIMEOUT _IOW('B',109, struct timeval) 73 #define BIOCGRTIMEOUT _IOR('B',110, struct timeval) 74 #define BIOCGSTATS _IOR('B',111, struct bpf_stat) 75 #define BIOCIMMEDIATE _IOW('B',112, u_int) 76 #endif 77 78 /* 79 * Structure prepended to each packet. 80 */ 81 struct bpf_hdr { 82 struct timeval bh_tstamp; /* time stamp */ 83 u_long bh_caplen; /* length of captured portion */ 84 u_long bh_datalen; /* original length of packet */ 85 u_short bh_hdrlen; /* length of bpf header (this struct 86 plus alignment padding) */ 87 }; 88 /* 89 * Because the structure above is not a multiple of 4 bytes, some compilers 90 * will insist on inserting padding; hence, sizeof(struct bpf_hdr) won't work. 91 * Only the kernel needs to know about it; applications use bh_hdrlen. 92 */ 93 #ifdef KERNEL 94 #define SIZEOF_BPF_HDR 18 95 #endif 96 97 /* 98 * Data-link level type codes. 99 * Currently, only DLT_EN10MB and DLT_SLIP are supported. 100 */ 101 #define DLT_NULL 0 /* no link-layer encapsulation */ 102 #define DLT_EN10MB 1 /* Ethernet (10Mb) */ 103 #define DLT_EN3MB 2 /* Experimental Ethernet (3Mb) */ 104 #define DLT_AX25 3 /* Amateur Radio AX.25 */ 105 #define DLT_PRONET 4 /* Proteon ProNET Token Ring */ 106 #define DLT_CHAOS 5 /* Chaos */ 107 #define DLT_IEEE802 6 /* IEEE 802 Networks */ 108 #define DLT_ARCNET 7 /* ARCNET */ 109 #define DLT_SLIP 8 /* Serial Line IP */ 110 #define DLT_PPP 9 /* Point-to-point Protocol */ 111 #define DLT_FDDI 10 /* FDDI */ 112 113 /* 114 * The instruction encondings. 115 */ 116 /* classes <2:0> */ 117 #define BPF_CLASS(code) ((code) & 0x07) 118 #define BPF_LD 0x00 119 #define BPF_LDX 0x01 120 #define BPF_ST 0x02 121 #define BPF_STX 0x03 122 #define BPF_ALU 0x04 123 #define BPF_JMP 0x05 124 #define BPF_RET 0x06 125 #define BPF_MISC 0x07 126 127 /* ld/ldx fields */ 128 #define BPF_SIZE(code) ((code) & 0x18) 129 #define BPF_W 0x00 130 #define BPF_H 0x08 131 #define BPF_B 0x10 132 #define BPF_MODE(code) ((code) & 0xe0) 133 #define BPF_IMM 0x00 134 #define BPF_ABS 0x20 135 #define BPF_IND 0x40 136 #define BPF_MEM 0x60 137 #define BPF_LEN 0x80 138 #define BPF_MSH 0xa0 139 140 /* alu/jmp fields */ 141 #define BPF_OP(code) ((code) & 0xf0) 142 #define BPF_ADD 0x00 143 #define BPF_SUB 0x10 144 #define BPF_MUL 0x20 145 #define BPF_DIV 0x30 146 #define BPF_OR 0x40 147 #define BPF_AND 0x50 148 #define BPF_LSH 0x60 149 #define BPF_RSH 0x70 150 #define BPF_NEG 0x80 151 #define BPF_JA 0x00 152 #define BPF_JEQ 0x10 153 #define BPF_JGT 0x20 154 #define BPF_JGE 0x30 155 #define BPF_JSET 0x40 156 #define BPF_SRC(code) ((code) & 0x08) 157 #define BPF_K 0x00 158 #define BPF_X 0x08 159 160 /* ret - BPF_K and BPF_X also apply */ 161 #define BPF_RVAL(code) ((code) & 0x18) 162 #define BPF_A 0x10 163 164 /* misc */ 165 #define BPF_MISCOP(code) ((code) & 0xf8) 166 #define BPF_TAX 0x00 167 #define BPF_TXA 0x80 168 169 /* 170 * The instruction data structure. 171 */ 172 struct bpf_insn { 173 u_short code; 174 u_char jt; 175 u_char jf; 176 long k; 177 }; 178 179 /* 180 * Macros for insn array initializers. 181 */ 182 #define BPF_STMT(code, k) { (u_short)(code), 0, 0, k } 183 #define BPF_JUMP(code, k, jt, jf) { (u_short)(code), jt, jf, k } 184 185 #ifdef KERNEL 186 extern u_int bpf_filter(); 187 extern void bpfattach(); 188 extern void bpf_tap(); 189 extern void bpf_mtap(); 190 #endif 191 192 /* 193 * Number of scratch memory words (for BPF_LD|BPF_MEM and BPF_ST). 194 */ 195 #define BPF_MEMWORDS 16 196 197