bpf.h revision 1.16
1 /* $NetBSD: bpf.h,v 1.16 1997/10/03 16:24:18 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 */ 42 43 #ifndef _NET_BPF_H_ 44 #define _NET_BPF_H_ 45 46 /* 47 * Alignment macros. BPF_WORDALIGN rounds up to the next 48 * even multiple of BPF_ALIGNMENT. 49 */ 50 #define BPF_ALIGNMENT sizeof(long) 51 #define BPF_WORDALIGN(x) (((x)+(BPF_ALIGNMENT-1))&~(BPF_ALIGNMENT-1)) 52 53 #define BPF_MAXINSNS 512 54 #define BPF_MAXBUFSIZE 0x8000 55 #define BPF_MINBUFSIZE 32 56 57 /* 58 * Structure for BIOCSETF. 59 */ 60 struct bpf_program { 61 u_int bf_len; 62 struct bpf_insn *bf_insns; 63 }; 64 65 /* 66 * Struct returned by BIOCGSTATS. 67 */ 68 struct bpf_stat { 69 u_int bs_recv; /* number of packets received */ 70 u_int bs_drop; /* number of packets dropped */ 71 }; 72 73 /* 74 * Struct return by BIOCVERSION. This represents the version number of 75 * the filter language described by the instruction encodings below. 76 * bpf understands a program iff kernel_major == filter_major && 77 * kernel_minor >= filter_minor, that is, if the value returned by the 78 * running kernel has the same major number and a minor number equal 79 * equal to or less than the filter being downloaded. Otherwise, the 80 * results are undefined, meaning an error may be returned or packets 81 * may be accepted haphazardly. 82 * It has nothing to do with the source code version. 83 */ 84 struct bpf_version { 85 u_short bv_major; 86 u_short bv_minor; 87 }; 88 /* Current version number of filter architecture. */ 89 #define BPF_MAJOR_VERSION 1 90 #define BPF_MINOR_VERSION 1 91 92 /* 93 * BPF ioctls 94 * 95 * The first set is for compatibility with Sun's pcc style 96 * header files. If your using gcc, we assume that you 97 * have run fixincludes so the latter set should work. 98 */ 99 #if (defined(sun) || defined(ibm032)) && !defined(__GNUC__) 100 #define BIOCGBLEN _IOR(B,102, u_int) 101 #define BIOCSBLEN _IOWR(B,102, u_int) 102 #define BIOCSETF _IOW(B,103, struct bpf_program) 103 #define BIOCFLUSH _IO(B,104) 104 #define BIOCPROMISC _IO(B,105) 105 #define BIOCGDLT _IOR(B,106, u_int) 106 #define BIOCGETIF _IOR(B,107, struct ifreq) 107 #define BIOCSETIF _IOW(B,108, struct ifreq) 108 #define BIOCSRTIMEOUT _IOW(B,109, struct timeval) 109 #define BIOCGRTIMEOUT _IOR(B,110, struct timeval) 110 #define BIOCGSTATS _IOR(B,111, struct bpf_stat) 111 #define BIOCIMMEDIATE _IOW(B,112, u_int) 112 #define BIOCVERSION _IOR(B,113, struct bpf_version) 113 #define BIOCSRSIG _IOW(B,114, u_int) 114 #define BIOCGRSIG _IOR(B,115, u_int) 115 #else 116 #define BIOCGBLEN _IOR('B',102, u_int) 117 #define BIOCSBLEN _IOWR('B',102, u_int) 118 #define BIOCSETF _IOW('B',103, struct bpf_program) 119 #define BIOCFLUSH _IO('B',104) 120 #define BIOCPROMISC _IO('B',105) 121 #define BIOCGDLT _IOR('B',106, u_int) 122 #define BIOCGETIF _IOR('B',107, struct ifreq) 123 #define BIOCSETIF _IOW('B',108, struct ifreq) 124 #define BIOCSRTIMEOUT _IOW('B',109, struct timeval) 125 #define BIOCGRTIMEOUT _IOR('B',110, struct timeval) 126 #define BIOCGSTATS _IOR('B',111, struct bpf_stat) 127 #define BIOCIMMEDIATE _IOW('B',112, u_int) 128 #define BIOCVERSION _IOR('B',113, struct bpf_version) 129 #define BIOCSRSIG _IOW('B',114, u_int) 130 #define BIOCGRSIG _IOR('B',115, u_int) 131 #endif 132 133 /* 134 * Structure prepended to each packet. 135 */ 136 struct bpf_hdr { 137 struct timeval bh_tstamp; /* time stamp */ 138 u_int32_t bh_caplen; /* length of captured portion */ 139 u_int32_t bh_datalen; /* original length of packet */ 140 u_int16_t bh_hdrlen; /* length of bpf header (this struct 141 plus alignment padding) */ 142 }; 143 /* 144 * Because the structure above is not a multiple of 4 bytes, some compilers 145 * will insist on inserting padding; hence, sizeof(struct bpf_hdr) won't work. 146 * Only the kernel needs to know about it; applications use bh_hdrlen. 147 * XXX To save a few bytes on 32-bit machines, we avoid end-of-struct 148 * XXX padding by using the size of the header data elements. This is 149 * XXX fail-safe: on new machines, we just use the 'safe' sizeof. 150 */ 151 #ifdef _KERNEL 152 #if defined(__arm32__) || defined(__i386__) || defined(__m68k__) || \ 153 defined(__mips__) || defined(__ns32k__) || defined(__sparc__) || \ 154 defined(__vax__) 155 #define SIZEOF_BPF_HDR 18 156 #else 157 #define SIZEOF_BPF_HDR sizeof(struct bpf_hdr) 158 #endif 159 #endif 160 161 /* 162 * Data-link level type codes. 163 */ 164 #define DLT_NULL 0 /* no link-layer encapsulation */ 165 #define DLT_EN10MB 1 /* Ethernet (10Mb) */ 166 #define DLT_EN3MB 2 /* Experimental Ethernet (3Mb) */ 167 #define DLT_AX25 3 /* Amateur Radio AX.25 */ 168 #define DLT_PRONET 4 /* Proteon ProNET Token Ring */ 169 #define DLT_CHAOS 5 /* Chaos */ 170 #define DLT_IEEE802 6 /* IEEE 802 Networks */ 171 #define DLT_ARCNET 7 /* ARCNET */ 172 #define DLT_SLIP 8 /* Serial Line IP */ 173 #define DLT_PPP 9 /* Point-to-point Protocol */ 174 #define DLT_FDDI 10 /* FDDI */ 175 #define DLT_ATM_RFC1483 11 /* LLC/SNAP encapsulated atm */ 176 #define DLT_RAW 12 /* raw IP */ 177 #define DLT_SLIP_BSDOS 13 /* BSD/OS Serial Line IP */ 178 #define DLT_PPP_BSDOS 14 /* BSD/OS Point-to-point Protocol */ 179 180 /* 181 * The instruction encondings. 182 */ 183 /* instruction classes */ 184 #define BPF_CLASS(code) ((code) & 0x07) 185 #define BPF_LD 0x00 186 #define BPF_LDX 0x01 187 #define BPF_ST 0x02 188 #define BPF_STX 0x03 189 #define BPF_ALU 0x04 190 #define BPF_JMP 0x05 191 #define BPF_RET 0x06 192 #define BPF_MISC 0x07 193 194 /* ld/ldx fields */ 195 #define BPF_SIZE(code) ((code) & 0x18) 196 #define BPF_W 0x00 197 #define BPF_H 0x08 198 #define BPF_B 0x10 199 #define BPF_MODE(code) ((code) & 0xe0) 200 #define BPF_IMM 0x00 201 #define BPF_ABS 0x20 202 #define BPF_IND 0x40 203 #define BPF_MEM 0x60 204 #define BPF_LEN 0x80 205 #define BPF_MSH 0xa0 206 207 /* alu/jmp fields */ 208 #define BPF_OP(code) ((code) & 0xf0) 209 #define BPF_ADD 0x00 210 #define BPF_SUB 0x10 211 #define BPF_MUL 0x20 212 #define BPF_DIV 0x30 213 #define BPF_OR 0x40 214 #define BPF_AND 0x50 215 #define BPF_LSH 0x60 216 #define BPF_RSH 0x70 217 #define BPF_NEG 0x80 218 #define BPF_JA 0x00 219 #define BPF_JEQ 0x10 220 #define BPF_JGT 0x20 221 #define BPF_JGE 0x30 222 #define BPF_JSET 0x40 223 #define BPF_SRC(code) ((code) & 0x08) 224 #define BPF_K 0x00 225 #define BPF_X 0x08 226 227 /* ret - BPF_K and BPF_X also apply */ 228 #define BPF_RVAL(code) ((code) & 0x18) 229 #define BPF_A 0x10 230 231 /* misc */ 232 #define BPF_MISCOP(code) ((code) & 0xf8) 233 #define BPF_TAX 0x00 234 #define BPF_TXA 0x80 235 236 /* 237 * The instruction data structure. 238 */ 239 struct bpf_insn { 240 u_int16_t code; 241 u_char jt; 242 u_char jf; 243 int32_t k; 244 }; 245 246 /* 247 * Macros for insn array initializers. 248 */ 249 #define BPF_STMT(code, k) { (u_int16_t)(code), 0, 0, k } 250 #define BPF_JUMP(code, k, jt, jf) { (u_int16_t)(code), jt, jf, k } 251 252 #ifdef _KERNEL 253 int bpf_validate __P((struct bpf_insn *, int)); 254 void bpf_tap __P((caddr_t, u_char *, u_int)); 255 void bpf_mtap __P((caddr_t, struct mbuf *)); 256 void bpfattach __P((caddr_t *, struct ifnet *, u_int, u_int)); 257 void bpfilterattach __P((int)); 258 #endif 259 260 u_int bpf_filter __P((struct bpf_insn *, u_char *, u_int, u_int)); 261 262 /* 263 * Number of scratch memory words (for BPF_LD|BPF_MEM and BPF_ST). 264 */ 265 #define BPF_MEMWORDS 16 266 267 #endif /* _NET_BPF_H_ */ 268
Indexes created Tue Sep 23 14:10:03 GMT 2025