1 /* 2 * Copyright (c) 1990 The Regents of the University of California. 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that: (1) source code distributions 7 * retain the above copyright notice and this paragraph in its entirety, (2) 8 * distributions including binary code include the above copyright notice and 9 * this paragraph in its entirety in the documentation or other materials 10 * provided with the distribution, and (3) all advertising materials mentioning 11 * features or use of this software display the following acknowledgement: 12 * ``This product includes software developed by the University of California, 13 * Lawrence Berkeley Laboratory and its contributors.'' Neither the name of 14 * the University nor the names of its contributors may be used to endorse 15 * or promote products derived from this software without specific prior 16 * written permission. 17 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED 18 * WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF 19 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. 20 * 21 * @(#) $Header: bpf.h,v 1.19 91/01/30 18:20:21 mccanne Exp $ (LBL) 22 * 23 * This code is derived from the Stanford/CMU enet packet filter, 24 * (net/enet.h) distributed with 4.3BSD Unix. 25 */ 26 27 /* 28 * Alignment macros. BPF_WORDALIGN rounds up to the next 29 * even multiple of BPF_ALIGNMENT. 30 */ 31 #define BPF_ALIGNMENT sizeof(long) 32 #define BPF_WORDALIGN(x) (((x)+(BPF_ALIGNMENT-1))&~(BPF_ALIGNMENT-1)) 33 34 #define BPF_MAXINSNS 512 35 #define BPF_MAXBUFSIZE 0x8000 36 37 /* 38 * Structure for BIOCSETF. 39 */ 40 struct bpf_program { 41 u_int bf_len; 42 struct bpf_insn *bf_insns; 43 }; 44 45 /* 46 * Struct returned by BIOCGSTATS. 47 */ 48 struct bpf_stat { 49 u_int bs_recv; /* number of packets received */ 50 u_int bs_drop; /* number of packets dropped */ 51 }; 52 53 /* 54 * BPF ioctls 55 * 56 * The first set is for compatibility with Sun's pcc style 57 * header files. If your using gcc, we assume that you 58 * have run fixincludes so the latter set should work. 59 */ 60 #if defined(sun) && !defined(__GNUC__) 61 #define BIOCGFLEN _IOR(B,101, u_int) 62 #define BIOCGBLEN _IOR(B,102, u_int) 63 #define BIOCSETF _IOW(B,103, struct bpf_program) 64 #define BIOCFLUSH _IO(B,104) 65 #define BIOCPROMISC _IO(B,105) 66 #define BIOCDEVP _IOR(B,106, struct bpf_devp) 67 #define BIOCGETIF _IOR(B,107, struct ifreq) 68 #define BIOCSETIF _IOW(B,108, struct ifreq) 69 #define BIOCSRTIMEOUT _IOW(B,109, struct timeval) 70 #define BIOCGRTIMEOUT _IOR(B,110, struct timeval) 71 #define BIOCGSTATS _IOR(B,111, struct bpf_stat) 72 #define BIOCIMMEDIATE _IOW(B,112, u_int) 73 #else 74 #define BIOCGFLEN _IOR('B',101, u_int) 75 #define BIOCGBLEN _IOR('B',102, u_int) 76 #define BIOCSETF _IOW('B',103, struct bpf_program) 77 #define BIOCFLUSH _IO('B',104) 78 #define BIOCPROMISC _IO('B',105) 79 #define BIOCDEVP _IOR('B',106, struct bpf_devp) 80 #define BIOCGETIF _IOR('B',107, struct ifreq) 81 #define BIOCSETIF _IOW('B',108, struct ifreq) 82 #define BIOCSRTIMEOUT _IOW('B',109, struct timeval) 83 #define BIOCGRTIMEOUT _IOR('B',110, struct timeval) 84 #define BIOCGSTATS _IOR('B',111, struct bpf_stat) 85 #define BIOCIMMEDIATE _IOW('B',112, u_int) 86 #endif 87 88 /* 89 * The device parameters of a network interface. 90 */ 91 struct bpf_devp { 92 u_short bdev_type; /* data link layer type, codes below */ 93 u_short bdev_hdrlen; /* length of a hardware packet header */ 94 }; 95 96 /* 97 * Structure prepended to each packet. 98 */ 99 struct bpf_hdr { 100 struct timeval bh_tstamp; /* time stamp */ 101 u_long bh_caplen; /* length of captured portion */ 102 u_long bh_datalen; /* original length of packet */ 103 u_short bh_hdrlen; /* length of bpf header (this struct 104 plus alignment padding) */ 105 }; 106 /* 107 * Because the structure above is not a multiple of 4 bytes, some compilers 108 * will insist on inserting padding; hence, sizeof(struct bpf_hdr) won't work. 109 * Only the kernel needs to know about it; applications use bh_hdrlen. 110 */ 111 #ifdef KERNEL 112 #define SIZEOF_BPF_HDR 18 113 #endif 114 115 /* 116 * Data-link level type codes. 117 * Currently, only ENDT_10MB and DLT_SLIP are supported. 118 */ 119 #define DLT_EN10MB 1 /* Ethernet (10Mb) */ 120 #define DLT_EN3MB 2 /* Experimental Ethernet (3Mb) */ 121 #define DLT_AX25 3 /* Amateur Radio AX.25 */ 122 #define DLT_PRONET 4 /* Proteon ProNET Token Ring */ 123 #define DLT_CHAOS 5 /* Chaos */ 124 #define DLT_IEEE802 6 /* IEEE 802 Networks */ 125 #define DLT_ARCNET 7 /* ARCNET */ 126 #define DLT_SLIP 8 /* Serial Line IP */ 127 #define DLT_PPP 9 /* Point-to-point Protocol */ 128 #define DLT_FDDI 10 /* FDDI */ 129 130 /* 131 * The opcodes are defined as an enumeration. However, they are stored 132 * explicitly in the code array as 'u_short'. 133 */ 134 enum bpf_code { 135 #define OPDEF(opcode, opstr) opcode , 136 #include <net/bpfcodes.h> 137 #undef OPDEF 138 /* this idea is borrowed from gcc */ 139 LAST_AND_UNUSED_ENUM 140 }; 141 142 #define BPF_NCODES ((unsigned)LAST_AND_UNUSED_ENUM) 143 #define BPF_VALIDCODE(code) ((unsigned)(code) < BPF_NCODES) 144 145 /* 146 * The instruction data structure. 147 */ 148 struct bpf_insn { 149 u_short code; 150 u_char jt; 151 u_char jf; 152 long k; 153 }; 154 155 /* 156 * Macros for array initializers. 157 */ 158 #define BPF_STMT(code, k) { (u_short)code, 0, 0, k } 159 #define BPF_JUMP(code, k, jt, jf) { (u_short)code, jt, jf, k } 160 161 #ifdef KERNEL 162 extern u_int bpf_filter(); 163 extern void bpfattach(); 164 extern void bpf_tap(); 165 extern void bpf_mtap(); 166 #endif 167 168 /* 169 * These two macros are sensitive to the order in which the 170 * opcodes appear in bpfcodes.h. 171 */ 172 #define BPF_ISJUMP(code) ((unsigned)(code) <= (unsigned)EQOp) 173 #define BPF_ISLEAF(code) ((unsigned)(code) >= (unsigned)RetOp) 174 175 /* 176 * Number of scratch memory words. 177 */ 178 #define BPF_MEMWORDS 16 179