1 /* $NetBSD: bpf.h,v 1.31 2002/09/21 17:02:46 thorpej 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 8.2 (Berkeley) 1/9/95 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 #include <sys/time.h> 48 49 /* BSD style release date */ 50 #define BPF_RELEASE 199606 51 52 typedef int bpf_int32; 53 typedef u_int bpf_u_int32; 54 55 /* 56 * Alignment macros. BPF_WORDALIGN rounds up to the next 57 * even multiple of BPF_ALIGNMENT. 58 */ 59 #define BPF_ALIGNMENT sizeof(long) 60 #define BPF_WORDALIGN(x) (((x)+(BPF_ALIGNMENT-1))&~(BPF_ALIGNMENT-1)) 61 62 #define BPF_MAXINSNS 512 63 #define BPF_MAXBUFSIZE 0x8000 64 #define BPF_MINBUFSIZE 32 65 66 /* 67 * Structure for BIOCSETF. 68 */ 69 struct bpf_program { 70 u_int bf_len; 71 struct bpf_insn *bf_insns; 72 }; 73 74 /* 75 * Struct returned by BIOCGSTATS. 76 */ 77 struct bpf_stat { 78 u_int bs_recv; /* number of packets received */ 79 u_int bs_drop; /* number of packets dropped */ 80 }; 81 82 /* 83 * Struct return by BIOCVERSION. This represents the version number of 84 * the filter language described by the instruction encodings below. 85 * bpf understands a program iff kernel_major == filter_major && 86 * kernel_minor >= filter_minor, that is, if the value returned by the 87 * running kernel has the same major number and a minor number equal 88 * equal to or less than the filter being downloaded. Otherwise, the 89 * results are undefined, meaning an error may be returned or packets 90 * may be accepted haphazardly. 91 * It has nothing to do with the source code version. 92 */ 93 struct bpf_version { 94 u_short bv_major; 95 u_short bv_minor; 96 }; 97 /* Current version number of filter architecture. */ 98 #define BPF_MAJOR_VERSION 1 99 #define BPF_MINOR_VERSION 1 100 101 /* 102 * BPF ioctls 103 * 104 * The first set is for compatibility with Sun's pcc style 105 * header files. If your using gcc, we assume that you 106 * have run fixincludes so the latter set should work. 107 */ 108 #define BIOCGBLEN _IOR('B',102, u_int) 109 #define BIOCSBLEN _IOWR('B',102, u_int) 110 #define BIOCSETF _IOW('B',103, struct bpf_program) 111 #define BIOCFLUSH _IO('B',104) 112 #define BIOCPROMISC _IO('B',105) 113 #define BIOCGDLT _IOR('B',106, u_int) 114 #define BIOCGETIF _IOR('B',107, struct ifreq) 115 #define BIOCSETIF _IOW('B',108, struct ifreq) 116 #define BIOCSRTIMEOUT _IOW('B',109, struct timeval) 117 #define BIOCGRTIMEOUT _IOR('B',110, struct timeval) 118 #define BIOCGSTATS _IOR('B',111, struct bpf_stat) 119 #define BIOCIMMEDIATE _IOW('B',112, u_int) 120 #define BIOCVERSION _IOR('B',113, struct bpf_version) 121 #define BIOCSTCPF _IOW('B',114, struct bpf_program) 122 #define BIOCSUDPF _IOW('B',115, struct bpf_program) 123 #define BIOCGHDRCMPLT _IOR('B',116, u_int) 124 #define BIOCSHDRCMPLT _IOW('B',117, u_int) 125 #define BIOCSDLT _IOW('B',118, u_int) 126 #define BIOCGDLTLIST _IOWR('B',119, struct bpf_dltlist) 127 128 /* 129 * Structure prepended to each packet. 130 */ 131 struct bpf_hdr { 132 struct timeval bh_tstamp; /* time stamp */ 133 u_int32_t bh_caplen; /* length of captured portion */ 134 u_int32_t bh_datalen; /* original length of packet */ 135 u_int16_t bh_hdrlen; /* length of bpf header (this struct 136 plus alignment padding) */ 137 }; 138 /* 139 * Because the structure above is not a multiple of 4 bytes, some compilers 140 * will insist on inserting padding; hence, sizeof(struct bpf_hdr) won't work. 141 * Only the kernel needs to know about it; applications use bh_hdrlen. 142 * XXX To save a few bytes on 32-bit machines, we avoid end-of-struct 143 * XXX padding by using the size of the header data elements. This is 144 * XXX fail-safe: on new machines, we just use the 'safe' sizeof. 145 */ 146 #ifdef _KERNEL 147 #if defined(__arm32__) || defined(__i386__) || defined(__m68k__) || \ 148 defined(__mips__) || defined(__ns32k__) || defined(__vax__) || \ 149 defined(__sh__) || (defined(__sparc__) && !defined(__sparc64__)) 150 #define SIZEOF_BPF_HDR 18 151 #else 152 #define SIZEOF_BPF_HDR sizeof(struct bpf_hdr) 153 #endif 154 #endif 155 156 /* Pull in data-link level type codes. */ 157 #include <net/dlt.h> 158 159 /* 160 * The instruction encondings. 161 */ 162 /* instruction classes */ 163 #define BPF_CLASS(code) ((code) & 0x07) 164 #define BPF_LD 0x00 165 #define BPF_LDX 0x01 166 #define BPF_ST 0x02 167 #define BPF_STX 0x03 168 #define BPF_ALU 0x04 169 #define BPF_JMP 0x05 170 #define BPF_RET 0x06 171 #define BPF_MISC 0x07 172 173 /* ld/ldx fields */ 174 #define BPF_SIZE(code) ((code) & 0x18) 175 #define BPF_W 0x00 176 #define BPF_H 0x08 177 #define BPF_B 0x10 178 #define BPF_MODE(code) ((code) & 0xe0) 179 #define BPF_IMM 0x00 180 #define BPF_ABS 0x20 181 #define BPF_IND 0x40 182 #define BPF_MEM 0x60 183 #define BPF_LEN 0x80 184 #define BPF_MSH 0xa0 185 186 /* alu/jmp fields */ 187 #define BPF_OP(code) ((code) & 0xf0) 188 #define BPF_ADD 0x00 189 #define BPF_SUB 0x10 190 #define BPF_MUL 0x20 191 #define BPF_DIV 0x30 192 #define BPF_OR 0x40 193 #define BPF_AND 0x50 194 #define BPF_LSH 0x60 195 #define BPF_RSH 0x70 196 #define BPF_NEG 0x80 197 #define BPF_JA 0x00 198 #define BPF_JEQ 0x10 199 #define BPF_JGT 0x20 200 #define BPF_JGE 0x30 201 #define BPF_JSET 0x40 202 #define BPF_SRC(code) ((code) & 0x08) 203 #define BPF_K 0x00 204 #define BPF_X 0x08 205 206 /* ret - BPF_K and BPF_X also apply */ 207 #define BPF_RVAL(code) ((code) & 0x18) 208 #define BPF_A 0x10 209 210 /* misc */ 211 #define BPF_MISCOP(code) ((code) & 0xf8) 212 #define BPF_TAX 0x00 213 #define BPF_TXA 0x80 214 215 /* 216 * The instruction data structure. 217 */ 218 struct bpf_insn { 219 u_int16_t code; 220 u_char jt; 221 u_char jf; 222 int32_t k; 223 }; 224 225 /* 226 * Macros for insn array initializers. 227 */ 228 #define BPF_STMT(code, k) { (u_int16_t)(code), 0, 0, k } 229 #define BPF_JUMP(code, k, jt, jf) { (u_int16_t)(code), jt, jf, k } 230 231 /* 232 * Structure to retrieve available DLTs for the interface. 233 */ 234 struct bpf_dltlist { 235 u_int bfl_len; /* number of bfd_list array */ 236 u_int *bfl_list; /* array of DLTs */ 237 }; 238 239 #ifdef _KERNEL 240 int bpf_validate __P((struct bpf_insn *, int)); 241 void bpf_tap __P((caddr_t, u_char *, u_int)); 242 void bpf_mtap __P((caddr_t, struct mbuf *)); 243 void bpfattach __P((struct ifnet *, u_int, u_int)); 244 void bpfattach2 __P((struct ifnet *, u_int, u_int, caddr_t *)); 245 void bpfdetach __P((struct ifnet *)); 246 void bpf_change_type __P((struct ifnet *, u_int, u_int)); 247 void bpfilterattach __P((int)); 248 #endif 249 250 u_int bpf_filter __P((struct bpf_insn *, u_char *, u_int, u_int)); 251 252 /* 253 * Number of scratch memory words (for BPF_LD|BPF_MEM and BPF_ST). 254 */ 255 #define BPF_MEMWORDS 16 256 257 #endif /* _NET_BPF_H_ */ 258