1 /* 2 * Copyright (c) 1990, 1991, 1993 3 * The Regents of the University of California. All rights reserved. 4 * 5 * This code is derived from the Stanford/CMU enet packet filter, 6 * (net/enet.c) distributed as part of 4.3BSD, and code contributed 7 * to Berkeley by Steven McCanne and Van Jacobson both of Lawrence 8 * Berkeley Laboratory. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 3. All advertising materials mentioning features or use of this software 19 * must display the following acknowledgement: 20 * This product includes software developed by the University of 21 * California, Berkeley and its contributors. 22 * 4. Neither the name of the University nor the names of its contributors 23 * may be used to endorse or promote products derived from this software 24 * without specific prior written permission. 25 * 26 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 27 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 28 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 29 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 30 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 31 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 32 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 33 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 34 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 35 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 36 * SUCH DAMAGE. 37 * 38 * @(#)bpf.h 8.1 (Berkeley) 6/10/93 39 * @(#)bpf.h 1.34 (LBL) 6/16/96 40 * 41 * $FreeBSD: src/sys/net/bpf.h,v 1.21.2.4 2002/07/05 14:40:00 fenner Exp $ 42 */ 43 44 #ifndef _NET_BPF_H_ 45 #define _NET_BPF_H_ 46 47 #ifndef _SYS_PARAM_H_ 48 #include <sys/param.h> 49 #endif 50 #ifndef _SYS_TIME_H_ 51 #include <sys/time.h> 52 #endif 53 #ifndef _SYS_IOCCOM_H_ 54 #include <sys/ioccom.h> 55 #endif 56 57 __BEGIN_DECLS 58 59 #define BPF_MAX_CLONES 128 60 61 /* BSD style release date */ 62 #define BPF_RELEASE 199606 63 64 typedef int32_t bpf_int32; 65 typedef u_int32_t bpf_u_int32; 66 67 /* 68 * Alignment macros. BPF_WORDALIGN rounds up to the next 69 * even multiple of BPF_ALIGNMENT. 70 */ 71 #define BPF_ALIGNMENT sizeof(long) 72 #define BPF_WORDALIGN(x) roundup2(x, BPF_ALIGNMENT) 73 74 #define BPF_MAXINSNS 512 75 #define BPF_MAXBUFSIZE 0x80000 76 #define BPF_DEFAULTBUFSIZE 4096 77 #define BPF_MINBUFSIZE 32 78 79 /* 80 * Structure for BIOCSETF. 81 */ 82 struct bpf_program { 83 u_int bf_len; 84 struct bpf_insn *bf_insns; 85 }; 86 87 /* 88 * Struct returned by BIOCGSTATS. 89 */ 90 struct bpf_stat { 91 u_int bs_recv; /* number of packets received */ 92 u_int bs_drop; /* number of packets dropped */ 93 }; 94 95 /* 96 * Struct return by BIOCVERSION. This represents the version number of 97 * the filter language described by the instruction encodings below. 98 * bpf understands a program iff kernel_major == filter_major && 99 * kernel_minor >= filter_minor, that is, if the value returned by the 100 * running kernel has the same major number and a minor number equal 101 * equal to or less than the filter being downloaded. Otherwise, the 102 * results are undefined, meaning an error may be returned or packets 103 * may be accepted haphazardly. 104 * It has nothing to do with the source code version. 105 */ 106 struct bpf_version { 107 u_short bv_major; 108 u_short bv_minor; 109 }; 110 /* Current version number of filter architecture. */ 111 #define BPF_MAJOR_VERSION 1 112 #define BPF_MINOR_VERSION 1 113 114 #define BIOCGBLEN _IOR('B',102, u_int) 115 #define BIOCSBLEN _IOWR('B',102, u_int) 116 #define BIOCSETF _IOW('B',103, struct bpf_program) 117 #define BIOCFLUSH _IO('B',104) 118 #define BIOCPROMISC _IO('B',105) 119 #define BIOCGDLT _IOR('B',106, u_int) 120 #define BIOCGETIF _IOR('B',107, struct ifreq) 121 #define BIOCSETIF _IOW('B',108, struct ifreq) 122 #define BIOCSRTIMEOUT _IOW('B',109, struct timeval) 123 #define BIOCGRTIMEOUT _IOR('B',110, struct timeval) 124 #define BIOCGSTATS _IOR('B',111, struct bpf_stat) 125 #define BIOCIMMEDIATE _IOW('B',112, u_int) 126 #define BIOCVERSION _IOR('B',113, struct bpf_version) 127 #define BIOCGRSIG _IOR('B',114, u_int) 128 #define BIOCSRSIG _IOW('B',115, u_int) 129 #define BIOCGHDRCMPLT _IOR('B',116, u_int) 130 #define BIOCSHDRCMPLT _IOW('B',117, u_int) 131 #define BIOCGSEESENT _IOR('B',118, u_int) 132 #define BIOCSSEESENT _IOW('B',119, u_int) 133 #define BIOCSDLT _IOW('B',120, u_int) 134 #define BIOCGDLTLIST _IOWR('B',121, struct bpf_dltlist) 135 #define BIOCLOCK _IO('B', 122) 136 #define BIOCSETWF _IOW('B',123, struct bpf_program) 137 138 /* 139 * Structure prepended to each packet. 140 */ 141 struct bpf_hdr { 142 struct timeval bh_tstamp; /* time stamp */ 143 bpf_u_int32 bh_caplen; /* length of captured portion */ 144 bpf_u_int32 bh_datalen; /* original length of packet */ 145 u_short bh_hdrlen; /* length of bpf header (this struct 146 plus alignment padding) */ 147 }; 148 /* 149 * Because the structure above is not a multiple of 4 bytes, some compilers 150 * will insist on inserting padding; hence, sizeof(struct bpf_hdr) won't work. 151 * Only the kernel needs to know about it; applications use bh_hdrlen. 152 */ 153 #ifdef _KERNEL 154 #define SIZEOF_BPF_HDR (sizeof(struct bpf_hdr) <= 20 ? 18 : \ 155 sizeof(struct bpf_hdr)) 156 #endif 157 158 #ifndef _NET_DLT_H 159 #include <net/dlt.h> 160 #endif 161 162 /* 163 * The instruction encodings. 164 */ 165 /* instruction classes */ 166 #define BPF_CLASS(code) ((code) & 0x07) 167 #define BPF_LD 0x00 168 #define BPF_LDX 0x01 169 #define BPF_ST 0x02 170 #define BPF_STX 0x03 171 #define BPF_ALU 0x04 172 #define BPF_JMP 0x05 173 #define BPF_RET 0x06 174 #define BPF_MISC 0x07 175 176 /* ld/ldx fields */ 177 #define BPF_SIZE(code) ((code) & 0x18) 178 #define BPF_W 0x00 179 #define BPF_H 0x08 180 #define BPF_B 0x10 181 #define BPF_MODE(code) ((code) & 0xe0) 182 #define BPF_IMM 0x00 183 #define BPF_ABS 0x20 184 #define BPF_IND 0x40 185 #define BPF_MEM 0x60 186 #define BPF_LEN 0x80 187 #define BPF_MSH 0xa0 188 189 /* alu/jmp fields */ 190 #define BPF_OP(code) ((code) & 0xf0) 191 #define BPF_ADD 0x00 192 #define BPF_SUB 0x10 193 #define BPF_MUL 0x20 194 #define BPF_DIV 0x30 195 #define BPF_OR 0x40 196 #define BPF_AND 0x50 197 #define BPF_LSH 0x60 198 #define BPF_RSH 0x70 199 #define BPF_NEG 0x80 200 #define BPF_JA 0x00 201 #define BPF_JEQ 0x10 202 #define BPF_JGT 0x20 203 #define BPF_JGE 0x30 204 #define BPF_JSET 0x40 205 #define BPF_SRC(code) ((code) & 0x08) 206 #define BPF_K 0x00 207 #define BPF_X 0x08 208 209 /* ret - BPF_K and BPF_X also apply */ 210 #define BPF_RVAL(code) ((code) & 0x18) 211 #define BPF_A 0x10 212 213 /* misc */ 214 #define BPF_MISCOP(code) ((code) & 0xf8) 215 #define BPF_TAX 0x00 216 #define BPF_TXA 0x80 217 218 /* 219 * The instruction data structure. 220 */ 221 struct bpf_insn { 222 u_short code; 223 u_char jt; 224 u_char jf; 225 bpf_u_int32 k; 226 }; 227 228 /* 229 * Macros for insn array initializers. 230 */ 231 #define BPF_STMT(code, k) { (u_short)(code), 0, 0, k } 232 #define BPF_JUMP(code, k, jt, jf) { (u_short)(code), jt, jf, k } 233 234 /* 235 * Structure to retrieve available DLTs for the interface. 236 */ 237 struct bpf_dltlist { 238 u_int bfl_len; /* number of bfd_list array */ 239 u_int *bfl_list; /* array of DLTs */ 240 }; 241 242 #ifdef _KERNEL 243 244 struct bpf_if; 245 struct ifnet; 246 struct mbuf; 247 248 int bpf_validate(const struct bpf_insn *, int); 249 void bpf_tap(struct bpf_if *, u_char *, u_int); 250 void bpf_mtap(struct bpf_if *, struct mbuf *); 251 void bpf_mtap_family(struct bpf_if *, struct mbuf *m, __uint8_t family); 252 void bpf_mtap_hdr(struct bpf_if *, caddr_t, u_int, struct mbuf *, u_int); 253 void bpf_ptap(struct bpf_if *, struct mbuf *, const void *, u_int); 254 void bpfattach(struct ifnet *, u_int, u_int); 255 void bpfattach_dlt(struct ifnet *, u_int, u_int, struct bpf_if **); 256 void bpfdetach(struct ifnet *); 257 void bpf_gettoken(void); 258 void bpf_reltoken(void); 259 260 u_int bpf_filter(const struct bpf_insn *, u_char *, u_int, u_int); 261 262 #define BPF_TAP(_ifp,_pkt,_pktlen) do { \ 263 if ((_ifp)->if_bpf) { \ 264 bpf_gettoken(); \ 265 if ((_ifp)->if_bpf) \ 266 bpf_tap((_ifp)->if_bpf, (_pkt), (_pktlen)); \ 267 bpf_reltoken(); \ 268 } \ 269 } while (0) 270 271 #define BPF_MTAP(_ifp,_m) do { \ 272 if ((_ifp)->if_bpf) { \ 273 bpf_gettoken(); \ 274 if ((_ifp)->if_bpf) \ 275 bpf_mtap((_ifp)->if_bpf, (_m)); \ 276 bpf_reltoken(); \ 277 } \ 278 } while (0) 279 280 #endif /* _KERNEL */ 281 282 /* 283 * Number of scratch memory words (for BPF_LD|BPF_MEM and BPF_ST). 284 */ 285 #define BPF_MEMWORDS 16 286 287 __END_DECLS 288 289 #endif /* !_NET_BPF_H_ */ 290