bpf.h revision 1.6
1 /* $NetBSD: bpf.h,v 1.6 1994/06/29 06:35:54 cgd Exp $ */ 2 3 /* 4 * Copyright (c) 1990, 1991, 1993 5 * The Regents of the University of California. All rights reserved. 6 * 7 * This code is derived from the Stanford/CMU enet packet filter, 8 * (net/enet.c) distributed as part of 4.3BSD, and code contributed 9 * to Berkeley by Steven McCanne and Van Jacobson both of Lawrence 10 * Berkeley Laboratory. 11 * 12 * Redistribution and use in source and binary forms, with or without 13 * modification, are permitted provided that the following conditions 14 * are met: 15 * 1. Redistributions of source code must retain the above copyright 16 * notice, this list of conditions and the following disclaimer. 17 * 2. Redistributions in binary form must reproduce the above copyright 18 * notice, this list of conditions and the following disclaimer in the 19 * documentation and/or other materials provided with the distribution. 20 * 3. All advertising materials mentioning features or use of this software 21 * must display the following acknowledgement: 22 * This product includes software developed by the University of 23 * California, Berkeley and its contributors. 24 * 4. Neither the name of the University nor the names of its contributors 25 * may be used to endorse or promote products derived from this software 26 * without specific prior written permission. 27 * 28 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 29 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 30 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 31 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 32 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 33 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 34 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 35 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 36 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 37 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 38 * SUCH DAMAGE. 39 * 40 * @(#)bpf.h 8.1 (Berkeley) 6/10/93 41 */ 42 43 /* 44 * Alignment macros. BPF_WORDALIGN rounds up to the next 45 * even multiple of BPF_ALIGNMENT. 46 */ 47 #define BPF_ALIGNMENT sizeof(long) 48 #define BPF_WORDALIGN(x) (((x)+(BPF_ALIGNMENT-1))&~(BPF_ALIGNMENT-1)) 49 50 #define BPF_MAXINSNS 512 51 #define BPF_MAXBUFSIZE 0x8000 52 #define BPF_MINBUFSIZE 32 53 54 /* 55 * Structure for BIOCSETF. 56 */ 57 struct bpf_program { 58 u_int bf_len; 59 struct bpf_insn *bf_insns; 60 }; 61 62 /* 63 * Struct returned by BIOCGSTATS. 64 */ 65 struct bpf_stat { 66 u_int bs_recv; /* number of packets received */ 67 u_int bs_drop; /* number of packets dropped */ 68 }; 69 70 /* 71 * Struct return by BIOCVERSION. This represents the version number of 72 * the filter language described by the instruction encodings below. 73 * bpf understands a program iff kernel_major == filter_major && 74 * kernel_minor >= filter_minor, that is, if the value returned by the 75 * running kernel has the same major number and a minor number equal 76 * equal to or less than the filter being downloaded. Otherwise, the 77 * results are undefined, meaning an error may be returned or packets 78 * may be accepted haphazardly. 79 * It has nothing to do with the source code version. 80 */ 81 struct bpf_version { 82 u_short bv_major; 83 u_short bv_minor; 84 }; 85 /* Current version number. */ 86 #define BPF_MAJOR_VERSION 1 87 #define BPF_MINOR_VERSION 1 88 89 /* 90 * BPF ioctls 91 * 92 * The first set is for compatibility with Sun's pcc style 93 * header files. If your using gcc, we assume that you 94 * have run fixincludes so the latter set should work. 95 */ 96 #if (defined(sun) || defined(ibm032)) && !defined(__GNUC__) 97 #define BIOCGBLEN _IOR(B,102, u_int) 98 #define BIOCSBLEN _IOWR(B,102, u_int) 99 #define BIOCSETF _IOW(B,103, struct bpf_program) 100 #define BIOCFLUSH _IO(B,104) 101 #define BIOCPROMISC _IO(B,105) 102 #define BIOCGDLT _IOR(B,106, u_int) 103 #define BIOCGETIF _IOR(B,107, struct ifreq) 104 #define BIOCSETIF _IOW(B,108, struct ifreq) 105 #define BIOCSRTIMEOUT _IOW(B,109, struct timeval) 106 #define BIOCGRTIMEOUT _IOR(B,110, struct timeval) 107 #define BIOCGSTATS _IOR(B,111, struct bpf_stat) 108 #define BIOCIMMEDIATE _IOW(B,112, u_int) 109 #define BIOCVERSION _IOR(B,113, struct bpf_version) 110 #else 111 #define BIOCGBLEN _IOR('B',102, u_int) 112 #define BIOCSBLEN _IOWR('B',102, u_int) 113 #define BIOCSETF _IOW('B',103, struct bpf_program) 114 #define BIOCFLUSH _IO('B',104) 115 #define BIOCPROMISC _IO('B',105) 116 #define BIOCGDLT _IOR('B',106, u_int) 117 #define BIOCGETIF _IOR('B',107, struct ifreq) 118 #define BIOCSETIF _IOW('B',108, struct ifreq) 119 #define BIOCSRTIMEOUT _IOW('B',109, struct timeval) 120 #define BIOCGRTIMEOUT _IOR('B',110, struct timeval) 121 #define BIOCGSTATS _IOR('B',111, struct bpf_stat) 122 #define BIOCIMMEDIATE _IOW('B',112, u_int) 123 #define BIOCVERSION _IOR('B',113, struct bpf_version) 124 #endif 125 126 /* 127 * Structure prepended to each packet. 128 */ 129 struct bpf_hdr { 130 struct timeval bh_tstamp; /* time stamp */ 131 u_long bh_caplen; /* length of captured portion */ 132 u_long bh_datalen; /* original length of packet */ 133 u_short bh_hdrlen; /* length of bpf header (this struct 134 plus alignment padding) */ 135 }; 136 /* 137 * Because the structure above is not a multiple of 4 bytes, some compilers 138 * will insist on inserting padding; hence, sizeof(struct bpf_hdr) won't work. 139 * Only the kernel needs to know about it; applications use bh_hdrlen. 140 */ 141 #ifdef KERNEL 142 #define SIZEOF_BPF_HDR 18 143 #endif 144 145 /* 146 * Data-link level type codes. 147 * Currently, only DLT_EN10MB and DLT_SLIP are supported. 148 */ 149 #define DLT_NULL 0 /* no link-layer encapsulation */ 150 #define DLT_EN10MB 1 /* Ethernet (10Mb) */ 151 #define DLT_EN3MB 2 /* Experimental Ethernet (3Mb) */ 152 #define DLT_AX25 3 /* Amateur Radio AX.25 */ 153 #define DLT_PRONET 4 /* Proteon ProNET Token Ring */ 154 #define DLT_CHAOS 5 /* Chaos */ 155 #define DLT_IEEE802 6 /* IEEE 802 Networks */ 156 #define DLT_ARCNET 7 /* ARCNET */ 157 #define DLT_SLIP 8 /* Serial Line IP */ 158 #define DLT_PPP 9 /* Point-to-point Protocol */ 159 #define DLT_FDDI 10 /* FDDI */ 160 161 /* 162 * The instruction encondings. 163 */ 164 /* instruction classes */ 165 #define BPF_CLASS(code) ((code) & 0x07) 166 #define BPF_LD 0x00 167 #define BPF_LDX 0x01 168 #define BPF_ST 0x02 169 #define BPF_STX 0x03 170 #define BPF_ALU 0x04 171 #define BPF_JMP 0x05 172 #define BPF_RET 0x06 173 #define BPF_MISC 0x07 174 175 /* ld/ldx fields */ 176 #define BPF_SIZE(code) ((code) & 0x18) 177 #define BPF_W 0x00 178 #define BPF_H 0x08 179 #define BPF_B 0x10 180 #define BPF_MODE(code) ((code) & 0xe0) 181 #define BPF_IMM 0x00 182 #define BPF_ABS 0x20 183 #define BPF_IND 0x40 184 #define BPF_MEM 0x60 185 #define BPF_LEN 0x80 186 #define BPF_MSH 0xa0 187 188 /* alu/jmp fields */ 189 #define BPF_OP(code) ((code) & 0xf0) 190 #define BPF_ADD 0x00 191 #define BPF_SUB 0x10 192 #define BPF_MUL 0x20 193 #define BPF_DIV 0x30 194 #define BPF_OR 0x40 195 #define BPF_AND 0x50 196 #define BPF_LSH 0x60 197 #define BPF_RSH 0x70 198 #define BPF_NEG 0x80 199 #define BPF_JA 0x00 200 #define BPF_JEQ 0x10 201 #define BPF_JGT 0x20 202 #define BPF_JGE 0x30 203 #define BPF_JSET 0x40 204 #define BPF_SRC(code) ((code) & 0x08) 205 #define BPF_K 0x00 206 #define BPF_X 0x08 207 208 /* ret - BPF_K and BPF_X also apply */ 209 #define BPF_RVAL(code) ((code) & 0x18) 210 #define BPF_A 0x10 211 212 /* misc */ 213 #define BPF_MISCOP(code) ((code) & 0xf8) 214 #define BPF_TAX 0x00 215 #define BPF_TXA 0x80 216 217 /* 218 * The instruction data structure. 219 */ 220 struct bpf_insn { 221 u_short code; 222 u_char jt; 223 u_char jf; 224 long k; 225 }; 226 227 /* 228 * Macros for insn array initializers. 229 */ 230 #define BPF_STMT(code, k) { (u_short)(code), 0, 0, k } 231 #define BPF_JUMP(code, k, jt, jf) { (u_short)(code), jt, jf, k } 232 233 #ifdef KERNEL 234 int bpf_validate __P((struct bpf_insn *, int)); 235 int bpfopen __P((dev_t, int)); 236 int bpfclose __P((dev_t, int)); 237 int bpfread __P((dev_t, struct uio *)); 238 int bpfwrite __P((dev_t, struct uio *)); 239 int bpfioctl __P((dev_t, int, caddr_t, int)); 240 int bpf_select __P((dev_t, int, struct proc *)); 241 void bpf_tap __P((caddr_t, u_char *, u_int)); 242 void bpf_mtap __P((caddr_t, struct mbuf *)); 243 void bpfattach __P((caddr_t *, struct ifnet *, u_int, u_int)); 244 void bpfilterattach __P((int)); 245 u_int bpf_filter __P((struct bpf_insn *, u_char *, u_int, u_int)); 246 #endif 247 248 /* 249 * Number of scratch memory words (for BPF_LD|BPF_MEM and BPF_ST). 250 */ 251 #define BPF_MEMWORDS 16 252 253
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