dist/ipf/bpf-ipf.h

   1 /*      $NetBSD$        */
   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 2.1.4.1 2007/10/26 12:15:08 darrenr Exp (LBL)
  43  */
  44
  45 #ifndef BPF_MAJOR_VERSION
  46
  47 #ifdef __cplusplus
  48 extern "C" {
  49 #endif
  50
  51 /* BSD style release date */
  52 #define BPF_RELEASE 199606
  53
  54 typedef int bpf_int32;
  55 typedef 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  */
  75 struct bpf_program {
  76         u_int bf_len;
  77         struct bpf_insn *bf_insns;
  78 };
  79
  80 /*
  81  * Struct returned by BIOCGSTATS.
  82  */
  83 struct 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  */
  99 struct 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  */
 151 struct 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  */
 405 struct 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__
 424 extern void bpf_tap(struct ifnet *, u_char *, u_int);
 425 extern void bpf_mtap(struct ifnet *, struct mbuf *);
 426 extern void bpfattach(struct ifnet *, u_int, u_int);
 427 extern void bpfilterattach(int);
 428 # else
 429 extern void bpf_tap();
 430 extern void bpf_mtap();
 431 extern void bpfattach();
 432 extern void bpfilterattach();
 433 # endif /* __STDC__ */
 434 #endif /* BSD && (_KERNEL || KERNEL) */
 435 #if __STDC__ || defined(__cplusplus)
 436 extern int bpf_validate(struct bpf_insn *, int);
 437 extern u_int bpf_filter(struct bpf_insn *, u_char *, u_int, u_int);
 438 #else
 439 extern int bpf_validate();
 440 extern 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