1/* $FreeBSD$ */ 2 3/*- 4 * Copyright (c) 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997 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 7.1 (Berkeley) 5/7/91 41 * 42 * @(#) $Header: /devel/CVS/IP-Filter/bpf-ipf.h,v 2.1 2002/10/26 12:14:26 darrenr Exp $ (LBL) 43 */ 44 45#ifndef BPF_MAJOR_VERSION 46 47#ifdef __cplusplus 48extern "C" { 49#endif 50 51/* BSD style release date */ 52#define BPF_RELEASE 199606 53 54typedef int bpf_int32; 55typedef u_int bpf_u_int32; 56 57/* 58 * Alignment macros. BPF_WORDALIGN rounds up to the next 59 * even multiple of BPF_ALIGNMENT. 60 */ 61#ifndef __NetBSD__ 62#define BPF_ALIGNMENT sizeof(bpf_int32) 63#else 64#define BPF_ALIGNMENT sizeof(long) 65#endif 66#define BPF_WORDALIGN(x) (((x)+(BPF_ALIGNMENT-1))&~(BPF_ALIGNMENT-1)) 67 68#define BPF_MAXINSNS 512 69#define BPF_MAXBUFSIZE 0x8000 70#define BPF_MINBUFSIZE 32 71 72/* 73 * Structure for BIOCSETF. 74 */ 75struct bpf_program { 76 u_int bf_len; 77 struct bpf_insn *bf_insns; 78}; 79 80/* 81 * Struct returned by BIOCGSTATS. 82 */ 83struct bpf_stat { 84 u_int bs_recv; /* number of packets received */ 85 u_int bs_drop; /* number of packets dropped */ 86}; 87 88/* 89 * Struct return by BIOCVERSION. This represents the version number of 90 * the filter language described by the instruction encodings below. 91 * bpf understands a program iff kernel_major == filter_major && 92 * kernel_minor >= filter_minor, that is, if the value returned by the 93 * running kernel has the same major number and a minor number equal 94 * equal to or less than the filter being downloaded. Otherwise, the 95 * results are undefined, meaning an error may be returned or packets 96 * may be accepted haphazardly. 97 * It has nothing to do with the source code version. 98 */ 99struct bpf_version { 100 u_short bv_major; 101 u_short bv_minor; 102}; 103/* Current version number of filter architecture. */ 104#define BPF_MAJOR_VERSION 1 105#define BPF_MINOR_VERSION 1 106 107/* 108 * BPF ioctls 109 * 110 * The first set is for compatibility with Sun's pcc style 111 * header files. If your using gcc, we assume that you 112 * have run fixincludes so the latter set should work. 113 */ 114#if (defined(sun) || defined(ibm032)) && !defined(__GNUC__) 115#define BIOCGBLEN _IOR(B,102, u_int) 116#define BIOCSBLEN _IOWR(B,102, u_int) 117#define BIOCSETF _IOW(B,103, struct bpf_program) 118#define BIOCFLUSH _IO(B,104) 119#define BIOCPROMISC _IO(B,105) 120#define BIOCGDLT _IOR(B,106, u_int) 121#define BIOCGETIF _IOR(B,107, struct ifreq) 122#define BIOCSETIF _IOW(B,108, struct ifreq) 123#define BIOCSRTIMEOUT _IOW(B,109, struct timeval) 124#define BIOCGRTIMEOUT _IOR(B,110, struct timeval) 125#define BIOCGSTATS _IOR(B,111, struct bpf_stat) 126#define BIOCIMMEDIATE _IOW(B,112, u_int) 127#define BIOCVERSION _IOR(B,113, struct bpf_version) 128#define BIOCSTCPF _IOW(B,114, struct bpf_program) 129#define BIOCSUDPF _IOW(B,115, struct bpf_program) 130#else 131#define BIOCGBLEN _IOR('B',102, u_int) 132#define BIOCSBLEN _IOWR('B',102, u_int) 133#define BIOCSETF _IOW('B',103, struct bpf_program) 134#define BIOCFLUSH _IO('B',104) 135#define BIOCPROMISC _IO('B',105) 136#define BIOCGDLT _IOR('B',106, u_int) 137#define BIOCGETIF _IOR('B',107, struct ifreq) 138#define BIOCSETIF _IOW('B',108, struct ifreq) 139#define BIOCSRTIMEOUT _IOW('B',109, struct timeval) 140#define BIOCGRTIMEOUT _IOR('B',110, struct timeval) 141#define BIOCGSTATS _IOR('B',111, struct bpf_stat) 142#define BIOCIMMEDIATE _IOW('B',112, u_int) 143#define BIOCVERSION _IOR('B',113, struct bpf_version) 144#define BIOCSTCPF _IOW('B',114, struct bpf_program) 145#define BIOCSUDPF _IOW('B',115, struct bpf_program) 146#endif 147 148/* 149 * Structure prepended to each packet. 150 */ 151struct bpf_hdr { 152 struct timeval bh_tstamp; /* time stamp */ 153 bpf_u_int32 bh_caplen; /* length of captured portion */ 154 bpf_u_int32 bh_datalen; /* original length of packet */ 155 u_short bh_hdrlen; /* length of bpf header (this struct 156 plus alignment padding) */ 157}; 158/* 159 * Because the structure above is not a multiple of 4 bytes, some compilers 160 * will insist on inserting padding; hence, sizeof(struct bpf_hdr) won't work. 161 * Only the kernel needs to know about it; applications use bh_hdrlen. 162 */ 163#if defined(KERNEL) || defined(_KERNEL) 164#define SIZEOF_BPF_HDR 18 165#endif 166 167/* 168 * Data-link level type codes. 169 */ 170 171/* 172 * These are the types that are the same on all platforms; on other 173 * platforms, a <net/bpf.h> should be supplied that defines the additional 174 * DLT_* codes appropriately for that platform (the BSDs, for example, 175 * should not just pick up this version of "bpf.h"; they should also define 176 * the additional DLT_* codes used by their kernels, as well as the values 177 * defined here - and, if the values they use for particular DLT_ types 178 * differ from those here, they should use their values, not the ones 179 * here). 180 */ 181#define DLT_NULL 0 /* no link-layer encapsulation */ 182#define DLT_EN10MB 1 /* Ethernet (10Mb) */ 183#define DLT_EN3MB 2 /* Experimental Ethernet (3Mb) */ 184#define DLT_AX25 3 /* Amateur Radio AX.25 */ 185#define DLT_PRONET 4 /* Proteon ProNET Token Ring */ 186#define DLT_CHAOS 5 /* Chaos */ 187#define DLT_IEEE802 6 /* IEEE 802 Networks */ 188#define DLT_ARCNET 7 /* ARCNET */ 189#define DLT_SLIP 8 /* Serial Line IP */ 190#define DLT_PPP 9 /* Point-to-point Protocol */ 191#define DLT_FDDI 10 /* FDDI */ 192 193/* 194 * These are values from the traditional libpcap "bpf.h". 195 * Ports of this to particular platforms should replace these definitions 196 * with the ones appropriate to that platform, if the values are 197 * different on that platform. 198 */ 199#define DLT_ATM_RFC1483 11 /* LLC/SNAP encapsulated atm */ 200#define DLT_RAW 12 /* raw IP */ 201 202/* 203 * These are values from BSD/OS's "bpf.h". 204 * These are not the same as the values from the traditional libpcap 205 * "bpf.h"; however, these values shouldn't be generated by any 206 * OS other than BSD/OS, so the correct values to use here are the 207 * BSD/OS values. 208 * 209 * Platforms that have already assigned these values to other 210 * DLT_ codes, however, should give these codes the values 211 * from that platform, so that programs that use these codes will 212 * continue to compile - even though they won't correctly read 213 * files of these types. 214 */ 215#ifdef __NetBSD__ 216#ifndef DLT_SLIP_BSDOS 217#define DLT_SLIP_BSDOS 13 /* BSD/OS Serial Line IP */ 218#define DLT_PPP_BSDOS 14 /* BSD/OS Point-to-point Protocol */ 219#endif 220#else 221#define DLT_SLIP_BSDOS 15 /* BSD/OS Serial Line IP */ 222#define DLT_PPP_BSDOS 16 /* BSD/OS Point-to-point Protocol */ 223#endif 224 225#define DLT_ATM_CLIP 19 /* Linux Classical-IP over ATM */ 226 227/* 228 * These values are defined by NetBSD; other platforms should refrain from 229 * using them for other purposes, so that NetBSD savefiles with link 230 * types of 50 or 51 can be read as this type on all platforms. 231 */ 232#define DLT_PPP_SERIAL 50 /* PPP over serial with HDLC encapsulation */ 233#define DLT_PPP_ETHER 51 /* PPP over Ethernet */ 234 235/* 236 * Values between 100 and 103 are used in capture file headers as 237 * link-layer types corresponding to DLT_ types that differ 238 * between platforms; don't use those values for new DLT_ new types. 239 */ 240 241/* 242 * This value was defined by libpcap 0.5; platforms that have defined 243 * it with a different value should define it here with that value - 244 * a link type of 104 in a save file will be mapped to DLT_C_HDLC, 245 * whatever value that happens to be, so programs will correctly 246 * handle files with that link type regardless of the value of 247 * DLT_C_HDLC. 248 * 249 * The name DLT_C_HDLC was used by BSD/OS; we use that name for source 250 * compatibility with programs written for BSD/OS. 251 * 252 * libpcap 0.5 defined it as DLT_CHDLC; we define DLT_CHDLC as well, 253 * for source compatibility with programs written for libpcap 0.5. 254 */ 255#define DLT_C_HDLC 104 /* Cisco HDLC */ 256#define DLT_CHDLC DLT_C_HDLC 257 258#define DLT_IEEE802_11 105 /* IEEE 802.11 wireless */ 259 260/* 261 * Values between 106 and 107 are used in capture file headers as 262 * link-layer types corresponding to DLT_ types that might differ 263 * between platforms; don't use those values for new DLT_ new types. 264 */ 265 266/* 267 * OpenBSD DLT_LOOP, for loopback devices; it's like DLT_NULL, except 268 * that the AF_ type in the link-layer header is in network byte order. 269 * 270 * OpenBSD defines it as 12, but that collides with DLT_RAW, so we 271 * define it as 108 here. If OpenBSD picks up this file, it should 272 * define DLT_LOOP as 12 in its version, as per the comment above - 273 * and should not use 108 as a DLT_ value. 274 */ 275#define DLT_LOOP 108 276 277/* 278 * Values between 109 and 112 are used in capture file headers as 279 * link-layer types corresponding to DLT_ types that might differ 280 * between platforms; don't use those values for new DLT_ types 281 * other than the corresponding DLT_ types. 282 */ 283 284/* 285 * This is for Linux cooked sockets. 286 */ 287#define DLT_LINUX_SLL 113 288 289/* 290 * Apple LocalTalk hardware. 291 */ 292#define DLT_LTALK 114 293 294/* 295 * Acorn Econet. 296 */ 297#define DLT_ECONET 115 298 299/* 300 * Reserved for use with OpenBSD ipfilter. 301 */ 302#define DLT_IPFILTER 116 303 304/* 305 * Reserved for use in capture-file headers as a link-layer type 306 * corresponding to OpenBSD DLT_PFLOG; DLT_PFLOG is 17 in OpenBSD, 307 * but that's DLT_LANE8023 in SuSE 6.3, so we can't use 17 for it 308 * in capture-file headers. 309 */ 310#define DLT_PFLOG 117 311 312/* 313 * Registered for Cisco-internal use. 314 */ 315#define DLT_CISCO_IOS 118 316 317/* 318 * Reserved for 802.11 cards using the Prism II chips, with a link-layer 319 * header including Prism monitor mode information plus an 802.11 320 * header. 321 */ 322#define DLT_PRISM_HEADER 119 323 324/* 325 * Reserved for Aironet 802.11 cards, with an Aironet link-layer header 326 * (see Doug Ambrisko's FreeBSD patches). 327 */ 328#define DLT_AIRONET_HEADER 120 329 330/* 331 * Reserved for Siemens HiPath HDLC. 332 */ 333#define DLT_HHDLC 121 334 335/* 336 * Reserved for RFC 2625 IP-over-Fibre Channel, as per a request from 337 * Don Lee <donlee@cray.com>. 338 * 339 * This is not for use with raw Fibre Channel, where the link-layer 340 * header starts with a Fibre Channel frame header; it's for IP-over-FC, 341 * where the link-layer header starts with an RFC 2625 Network_Header 342 * field. 343 */ 344#define DLT_IP_OVER_FC 122 345 346/* 347 * The instruction encodings. 348 */ 349/* instruction classes */ 350#define BPF_CLASS(code) ((code) & 0x07) 351#define BPF_LD 0x00 352#define BPF_LDX 0x01 353#define BPF_ST 0x02 354#define BPF_STX 0x03 355#define BPF_ALU 0x04 356#define BPF_JMP 0x05 357#define BPF_RET 0x06 358#define BPF_MISC 0x07 359 360/* ld/ldx fields */ 361#define BPF_SIZE(code) ((code) & 0x18) 362#define BPF_W 0x00 363#define BPF_H 0x08 364#define BPF_B 0x10 365#define BPF_MODE(code) ((code) & 0xe0) 366#define BPF_IMM 0x00 367#define BPF_ABS 0x20 368#define BPF_IND 0x40 369#define BPF_MEM 0x60 370#define BPF_LEN 0x80 371#define BPF_MSH 0xa0 372 373/* alu/jmp fields */ 374#define BPF_OP(code) ((code) & 0xf0) 375#define BPF_ADD 0x00 376#define BPF_SUB 0x10 377#define BPF_MUL 0x20 378#define BPF_DIV 0x30 379#define BPF_OR 0x40 380#define BPF_AND 0x50 381#define BPF_LSH 0x60 382#define BPF_RSH 0x70 383#define BPF_NEG 0x80 384#define BPF_JA 0x00 385#define BPF_JEQ 0x10 386#define BPF_JGT 0x20 387#define BPF_JGE 0x30 388#define BPF_JSET 0x40 389#define BPF_SRC(code) ((code) & 0x08) 390#define BPF_K 0x00 391#define BPF_X 0x08 392 393/* ret - BPF_K and BPF_X also apply */ 394#define BPF_RVAL(code) ((code) & 0x18) 395#define BPF_A 0x10 396 397/* misc */ 398#define BPF_MISCOP(code) ((code) & 0xf8) 399#define BPF_TAX 0x00 400#define BPF_TXA 0x80 401 402/* 403 * The instruction data structure. 404 */ 405struct bpf_insn { 406 u_short code; 407 u_char jt; 408 u_char jf; 409 bpf_int32 k; 410}; 411 412/* 413 * Macros for insn array initializers. 414 */ 415#define BPF_STMT(code, k) { (u_short)(code), 0, 0, k } 416#define BPF_JUMP(code, k, jt, jf) { (u_short)(code), jt, jf, k } 417 418#if defined(BSD) && (defined(KERNEL) || defined(_KERNEL)) 419/* 420 * Systems based on non-BSD kernels don't have ifnet's (or they don't mean 421 * anything if it is in <net/if.h>) and won't work like this. 422 */ 423# if __STDC__ 424extern void bpf_tap(struct ifnet *, u_char *, u_int); 425extern void bpf_mtap(struct ifnet *, struct mbuf *); 426extern void bpfattach(struct ifnet *, u_int, u_int); 427extern void bpfilterattach(int); 428# else 429extern void bpf_tap(); 430extern void bpf_mtap(); 431extern void bpfattach(); 432extern void bpfilterattach(); 433# endif /* __STDC__ */ 434#endif /* BSD && (_KERNEL || KERNEL) */ 435#if __STDC__ || defined(__cplusplus) 436extern int bpf_validate(struct bpf_insn *, int); 437extern u_int bpf_filter(struct bpf_insn *, u_char *, u_int, u_int); 438#else 439extern int bpf_validate(); 440extern u_int bpf_filter(); 441#endif 442 443/* 444 * Number of scratch memory words (for BPF_LD|BPF_MEM and BPF_ST). 445 */ 446#define BPF_MEMWORDS 16 447 448#ifdef __cplusplus 449} 450#endif 451 452#endif 453