bpf.h revision 1.17
1 /* $NetBSD: bpf.h,v 1.17 1997/10/09 18:18:37 christos 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 * @(#) Header: bpf.h,v 1.36 97/06/12 14:29:53 leres Exp (LBL) 42 */ 43 44 #ifndef _NET_BPF_H_ 45 #define _NET_BPF_H_ 46 47 /* BSD style release date */ 48 #define BPF_RELEASE 199606 49 50 /* 51 * Alignment macros. BPF_WORDALIGN rounds up to the next 52 * even multiple of BPF_ALIGNMENT. 53 */ 54 #define BPF_ALIGNMENT sizeof(long) 55 #define BPF_WORDALIGN(x) (((x)+(BPF_ALIGNMENT-1))&~(BPF_ALIGNMENT-1)) 56 57 #define BPF_MAXINSNS 512 58 #define BPF_MAXBUFSIZE 0x8000 59 #define BPF_MINBUFSIZE 32 60 61 /* 62 * Structure for BIOCSETF. 63 */ 64 struct bpf_program { 65 u_int bf_len; 66 struct bpf_insn *bf_insns; 67 }; 68 69 /* 70 * Struct returned by BIOCGSTATS. 71 */ 72 struct bpf_stat { 73 u_int bs_recv; /* number of packets received */ 74 u_int bs_drop; /* number of packets dropped */ 75 }; 76 77 /* 78 * Struct return by BIOCVERSION. This represents the version number of 79 * the filter language described by the instruction encodings below. 80 * bpf understands a program iff kernel_major == filter_major && 81 * kernel_minor >= filter_minor, that is, if the value returned by the 82 * running kernel has the same major number and a minor number equal 83 * equal to or less than the filter being downloaded. Otherwise, the 84 * results are undefined, meaning an error may be returned or packets 85 * may be accepted haphazardly. 86 * It has nothing to do with the source code version. 87 */ 88 struct bpf_version { 89 u_short bv_major; 90 u_short bv_minor; 91 }; 92 /* Current version number of filter architecture. */ 93 #define BPF_MAJOR_VERSION 1 94 #define BPF_MINOR_VERSION 1 95 96 /* 97 * BPF ioctls 98 * 99 * The first set is for compatibility with Sun's pcc style 100 * header files. If your using gcc, we assume that you 101 * have run fixincludes so the latter set should work. 102 */ 103 #if (defined(sun) || defined(ibm032)) && !defined(__GNUC__) 104 #define BIOCGBLEN _IOR(B,102, u_int) 105 #define BIOCSBLEN _IOWR(B,102, u_int) 106 #define BIOCSETF _IOW(B,103, struct bpf_program) 107 #define BIOCFLUSH _IO(B,104) 108 #define BIOCPROMISC _IO(B,105) 109 #define BIOCGDLT _IOR(B,106, u_int) 110 #define BIOCGETIF _IOR(B,107, struct ifreq) 111 #define BIOCSETIF _IOW(B,108, struct ifreq) 112 #define BIOCSRTIMEOUT _IOW(B,109, struct timeval) 113 #define BIOCGRTIMEOUT _IOR(B,110, struct timeval) 114 #define BIOCGSTATS _IOR(B,111, struct bpf_stat) 115 #define BIOCIMMEDIATE _IOW(B,112, u_int) 116 #define BIOCVERSION _IOR(B,113, struct bpf_version) 117 #define BIOCSTCPF _IOW(B,114, struct bpf_program) 118 #define BIOCSUDPF _IOW(B,115, struct bpf_program) 119 #else 120 #define BIOCGBLEN _IOR('B',102, u_int) 121 #define BIOCSBLEN _IOWR('B',102, u_int) 122 #define BIOCSETF _IOW('B',103, struct bpf_program) 123 #define BIOCFLUSH _IO('B',104) 124 #define BIOCPROMISC _IO('B',105) 125 #define BIOCGDLT _IOR('B',106, u_int) 126 #define BIOCGETIF _IOR('B',107, struct ifreq) 127 #define BIOCSETIF _IOW('B',108, struct ifreq) 128 #define BIOCSRTIMEOUT _IOW('B',109, struct timeval) 129 #define BIOCGRTIMEOUT _IOR('B',110, struct timeval) 130 #define BIOCGSTATS _IOR('B',111, struct bpf_stat) 131 #define BIOCIMMEDIATE _IOW('B',112, u_int) 132 #define BIOCVERSION _IOR('B',113, struct bpf_version) 133 #define BIOCSTCPF _IOW('B',114, struct bpf_program) 134 #define BIOCSUDPF _IOW('B',115, struct bpf_program) 135 #endif 136 137 /* 138 * Structure prepended to each packet. 139 */ 140 struct bpf_hdr { 141 struct timeval bh_tstamp; /* time stamp */ 142 u_int32_t bh_caplen; /* length of captured portion */ 143 u_int32_t bh_datalen; /* original length of packet */ 144 u_int16_t bh_hdrlen; /* length of bpf header (this struct 145 plus alignment padding) */ 146 }; 147 /* 148 * Because the structure above is not a multiple of 4 bytes, some compilers 149 * will insist on inserting padding; hence, sizeof(struct bpf_hdr) won't work. 150 * Only the kernel needs to know about it; applications use bh_hdrlen. 151 * XXX To save a few bytes on 32-bit machines, we avoid end-of-struct 152 * XXX padding by using the size of the header data elements. This is 153 * XXX fail-safe: on new machines, we just use the 'safe' sizeof. 154 */ 155 #ifdef _KERNEL 156 #if defined(__arm32__) || defined(__i386__) || defined(__m68k__) || \ 157 defined(__mips__) || defined(__ns32k__) || defined(__sparc__) || \ 158 defined(__vax__) 159 #define SIZEOF_BPF_HDR 18 160 #else 161 #define SIZEOF_BPF_HDR sizeof(struct bpf_hdr) 162 #endif 163 #endif 164 165 /* 166 * Data-link level type codes. 167 */ 168 #define DLT_NULL 0 /* no link-layer encapsulation */ 169 #define DLT_EN10MB 1 /* Ethernet (10Mb) */ 170 #define DLT_EN3MB 2 /* Experimental Ethernet (3Mb) */ 171 #define DLT_AX25 3 /* Amateur Radio AX.25 */ 172 #define DLT_PRONET 4 /* Proteon ProNET Token Ring */ 173 #define DLT_CHAOS 5 /* Chaos */ 174 #define DLT_IEEE802 6 /* IEEE 802 Networks */ 175 #define DLT_ARCNET 7 /* ARCNET */ 176 #define DLT_SLIP 8 /* Serial Line IP */ 177 #define DLT_PPP 9 /* Point-to-point Protocol */ 178 #define DLT_FDDI 10 /* FDDI */ 179 #define DLT_ATM_RFC1483 11 /* LLC/SNAP encapsulated atm */ 180 #define DLT_RAW 12 /* raw IP */ 181 #define DLT_SLIP_BSDOS 13 /* BSD/OS Serial Line IP */ 182 #define DLT_PPP_BSDOS 14 /* BSD/OS Point-to-point Protocol */ 183 184 /* 185 * The instruction encondings. 186 */ 187 /* instruction classes */ 188 #define BPF_CLASS(code) ((code) & 0x07) 189 #define BPF_LD 0x00 190 #define BPF_LDX 0x01 191 #define BPF_ST 0x02 192 #define BPF_STX 0x03 193 #define BPF_ALU 0x04 194 #define BPF_JMP 0x05 195 #define BPF_RET 0x06 196 #define BPF_MISC 0x07 197 198 /* ld/ldx fields */ 199 #define BPF_SIZE(code) ((code) & 0x18) 200 #define BPF_W 0x00 201 #define BPF_H 0x08 202 #define BPF_B 0x10 203 #define BPF_MODE(code) ((code) & 0xe0) 204 #define BPF_IMM 0x00 205 #define BPF_ABS 0x20 206 #define BPF_IND 0x40 207 #define BPF_MEM 0x60 208 #define BPF_LEN 0x80 209 #define BPF_MSH 0xa0 210 211 /* alu/jmp fields */ 212 #define BPF_OP(code) ((code) & 0xf0) 213 #define BPF_ADD 0x00 214 #define BPF_SUB 0x10 215 #define BPF_MUL 0x20 216 #define BPF_DIV 0x30 217 #define BPF_OR 0x40 218 #define BPF_AND 0x50 219 #define BPF_LSH 0x60 220 #define BPF_RSH 0x70 221 #define BPF_NEG 0x80 222 #define BPF_JA 0x00 223 #define BPF_JEQ 0x10 224 #define BPF_JGT 0x20 225 #define BPF_JGE 0x30 226 #define BPF_JSET 0x40 227 #define BPF_SRC(code) ((code) & 0x08) 228 #define BPF_K 0x00 229 #define BPF_X 0x08 230 231 /* ret - BPF_K and BPF_X also apply */ 232 #define BPF_RVAL(code) ((code) & 0x18) 233 #define BPF_A 0x10 234 235 /* misc */ 236 #define BPF_MISCOP(code) ((code) & 0xf8) 237 #define BPF_TAX 0x00 238 #define BPF_TXA 0x80 239 240 /* 241 * The instruction data structure. 242 */ 243 struct bpf_insn { 244 u_int16_t code; 245 u_char jt; 246 u_char jf; 247 int32_t k; 248 }; 249 250 /* 251 * Macros for insn array initializers. 252 */ 253 #define BPF_STMT(code, k) { (u_int16_t)(code), 0, 0, k } 254 #define BPF_JUMP(code, k, jt, jf) { (u_int16_t)(code), jt, jf, k } 255 256 #ifdef _KERNEL 257 int bpf_validate __P((struct bpf_insn *, int)); 258 void bpf_tap __P((caddr_t, u_char *, u_int)); 259 void bpf_mtap __P((caddr_t, struct mbuf *)); 260 void bpfattach __P((caddr_t *, struct ifnet *, u_int, u_int)); 261 void bpfilterattach __P((int)); 262 #endif 263 264 u_int bpf_filter __P((struct bpf_insn *, u_char *, u_int, u_int)); 265 266 /* 267 * Number of scratch memory words (for BPF_LD|BPF_MEM and BPF_ST). 268 */ 269 #define BPF_MEMWORDS 16 270 271 #endif /* _NET_BPF_H_ */ 272
Indexes created Wed Sep 24 05:09:52 GMT 2025