1 /*- 2 * Copyright (c) 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997 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 7.1 (Berkeley) 5/7/91 39 * 40 * @(#) $Header$ (LBL) 41 */ 42 43 #ifndef BPF_MAJOR_VERSION 44 45 /* BSD style release date */ 46 #define BPF_RELEASE 199606 47 48 typedef int bpf_int32; 49 typedef u_int bpf_u_int32; 50 51 /* 52 * Alignment macros. BPF_WORDALIGN rounds up to the next 53 * even multiple of BPF_ALIGNMENT. 54 */ 55 #ifndef __NetBSD__ 56 #define BPF_ALIGNMENT sizeof(bpf_int32) 57 #else 58 #define BPF_ALIGNMENT sizeof(long) 59 #endif 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 #if (defined(sun) || defined(ibm032)) && !defined(__GNUC__) 109 #define BIOCGBLEN _IOR(B,102, u_int) 110 #define BIOCSBLEN _IOWR(B,102, u_int) 111 #define BIOCSETF _IOW(B,103, struct bpf_program) 112 #define BIOCFLUSH _IO(B,104) 113 #define BIOCPROMISC _IO(B,105) 114 #define BIOCGDLT _IOR(B,106, u_int) 115 #define BIOCGETIF _IOR(B,107, struct ifreq) 116 #define BIOCSETIF _IOW(B,108, struct ifreq) 117 #define BIOCSRTIMEOUT _IOW(B,109, struct timeval) 118 #define BIOCGRTIMEOUT _IOR(B,110, struct timeval) 119 #define BIOCGSTATS _IOR(B,111, struct bpf_stat) 120 #define BIOCIMMEDIATE _IOW(B,112, u_int) 121 #define BIOCVERSION _IOR(B,113, struct bpf_version) 122 #define BIOCSTCPF _IOW(B,114, struct bpf_program) 123 #define BIOCSUDPF _IOW(B,115, struct bpf_program) 124 #else 125 #define BIOCGBLEN _IOR('B',102, u_int) 126 #define BIOCSBLEN _IOWR('B',102, u_int) 127 #define BIOCSETF _IOW('B',103, struct bpf_program) 128 #define BIOCFLUSH _IO('B',104) 129 #define BIOCPROMISC _IO('B',105) 130 #define BIOCGDLT _IOR('B',106, u_int) 131 #define BIOCGETIF _IOR('B',107, struct ifreq) 132 #define BIOCSETIF _IOW('B',108, struct ifreq) 133 #define BIOCSRTIMEOUT _IOW('B',109, struct timeval) 134 #define BIOCGRTIMEOUT _IOR('B',110, struct timeval) 135 #define BIOCGSTATS _IOR('B',111, struct bpf_stat) 136 #define BIOCIMMEDIATE _IOW('B',112, u_int) 137 #define BIOCVERSION _IOR('B',113, struct bpf_version) 138 #define BIOCSTCPF _IOW('B',114, struct bpf_program) 139 #define BIOCSUDPF _IOW('B',115, struct bpf_program) 140 #endif 141 142 /* 143 * Structure prepended to each packet. 144 */ 145 struct bpf_hdr { 146 struct timeval bh_tstamp; /* time stamp */ 147 bpf_u_int32 bh_caplen; /* length of captured portion */ 148 bpf_u_int32 bh_datalen; /* original length of packet */ 149 u_short bh_hdrlen; /* length of bpf header (this struct 150 plus alignment padding) */ 151 }; 152 /* 153 * Because the structure above is not a multiple of 4 bytes, some compilers 154 * will insist on inserting padding; hence, sizeof(struct bpf_hdr) won't work. 155 * Only the kernel needs to know about it; applications use bh_hdrlen. 156 */ 157 #if defined(KERNEL) || defined(_KERNEL) 158 #define SIZEOF_BPF_HDR 18 159 #endif 160 161 /* 162 * Data-link level type codes. 163 */ 164 165 /* 166 * These are the types that are the same on all platforms; on other 167 * platforms, a <net/bpf.h> should be supplied that defines the additional 168 * DLT_* codes appropriately for that platform (the BSDs, for example, 169 * should not just pick up this version of "bpf.h"; they should also define 170 * the additional DLT_* codes used by their kernels, as well as the values 171 * defined here - and, if the values they use for particular DLT_ types 172 * differ from those here, they should use their values, not the ones 173 * here). 174 */ 175 #define DLT_NULL 0 /* no link-layer encapsulation */ 176 #define DLT_EN10MB 1 /* Ethernet (10Mb) */ 177 #define DLT_EN3MB 2 /* Experimental Ethernet (3Mb) */ 178 #define DLT_AX25 3 /* Amateur Radio AX.25 */ 179 #define DLT_PRONET 4 /* Proteon ProNET Token Ring */ 180 #define DLT_CHAOS 5 /* Chaos */ 181 #define DLT_IEEE802 6 /* IEEE 802 Networks */ 182 #define DLT_ARCNET 7 /* ARCNET */ 183 #define DLT_SLIP 8 /* Serial Line IP */ 184 #define DLT_PPP 9 /* Point-to-point Protocol */ 185 #define DLT_FDDI 10 /* FDDI */ 186 187 /* 188 * These are values from the traditional libpcap "bpf.h". 189 * Ports of this to particular platforms should replace these definitions 190 * with the ones appropriate to that platform, if the values are 191 * different on that platform. 192 */ 193 #define DLT_ATM_RFC1483 11 /* LLC/SNAP encapsulated atm */ 194 #define DLT_RAW 12 /* raw IP */ 195 196 /* 197 * These are values from BSD/OS's "bpf.h". 198 * These are not the same as the values from the traditional libpcap 199 * "bpf.h"; however, these values shouldn't be generated by any 200 * OS other than BSD/OS, so the correct values to use here are the 201 * BSD/OS values. 202 * 203 * Platforms that have already assigned these values to other 204 * DLT_ codes, however, should give these codes the values 205 * from that platform, so that programs that use these codes will 206 * continue to compile - even though they won't correctly read 207 * files of these types. 208 */ 209 #ifdef __NetBSD__ 210 #ifndef DLT_SLIP_BSDOS 211 #define DLT_SLIP_BSDOS 13 /* BSD/OS Serial Line IP */ 212 #define DLT_PPP_BSDOS 14 /* BSD/OS Point-to-point Protocol */ 213 #endif 214 #else 215 #define DLT_SLIP_BSDOS 15 /* BSD/OS Serial Line IP */ 216 #define DLT_PPP_BSDOS 16 /* BSD/OS Point-to-point Protocol */ 217 #endif 218 219 #define DLT_ATM_CLIP 19 /* Linux Classical-IP over ATM */ 220 221 /* 222 * These values are defined by NetBSD; other platforms should refrain from 223 * using them for other purposes, so that NetBSD savefiles with link 224 * types of 50 or 51 can be read as this type on all platforms. 225 */ 226 #define DLT_PPP_SERIAL 50 /* PPP over serial with HDLC encapsulation */ 227 #define DLT_PPP_ETHER 51 /* PPP over Ethernet */ 228 229 /* 230 * Values between 100 and 103 are used in capture file headers as 231 * link-layer types corresponding to DLT_ types that differ 232 * between platforms; don't use those values for new DLT_ new types. 233 */ 234 235 /* 236 * This value was defined by libpcap 0.5; platforms that have defined 237 * it with a different value should define it here with that value - 238 * a link type of 104 in a save file will be mapped to DLT_C_HDLC, 239 * whatever value that happens to be, so programs will correctly 240 * handle files with that link type regardless of the value of 241 * DLT_C_HDLC. 242 * 243 * The name DLT_C_HDLC was used by BSD/OS; we use that name for source 244 * compatibility with programs written for BSD/OS. 245 * 246 * libpcap 0.5 defined it as DLT_CHDLC; we define DLT_CHDLC as well, 247 * for source compatibility with programs written for libpcap 0.5. 248 */ 249 #define DLT_C_HDLC 104 /* Cisco HDLC */ 250 #define DLT_CHDLC DLT_C_HDLC 251 252 #define DLT_IEEE802_11 105 /* IEEE 802.11 wireless */ 253 254 /* 255 * Values between 106 and 107 are used in capture file headers as 256 * link-layer types corresponding to DLT_ types that might differ 257 * between platforms; don't use those values for new DLT_ new types. 258 */ 259 260 /* 261 * OpenBSD DLT_LOOP, for loopback devices; it's like DLT_NULL, except 262 * that the AF_ type in the link-layer header is in network byte order. 263 * 264 * OpenBSD defines it as 12, but that collides with DLT_RAW, so we 265 * define it as 108 here. If OpenBSD picks up this file, it should 266 * define DLT_LOOP as 12 in its version, as per the comment above - 267 * and should not use 108 as a DLT_ value. 268 */ 269 #define DLT_LOOP 108 270 271 /* 272 * Values between 109 and 112 are used in capture file headers as 273 * link-layer types corresponding to DLT_ types that might differ 274 * between platforms; don't use those values for new DLT_ types 275 * other than the corresponding DLT_ types. 276 */ 277 278 /* 279 * This is for Linux cooked sockets. 280 */ 281 #define DLT_LINUX_SLL 113 282 283 /* 284 * Apple LocalTalk hardware. 285 */ 286 #define DLT_LTALK 114 287 288 /* 289 * Acorn Econet. 290 */ 291 #define DLT_ECONET 115 292 293 /* 294 * Reserved for use with OpenBSD ipfilter. 295 */ 296 #define DLT_IPFILTER 116 297 298 /* 299 * Reserved for use in capture-file headers as a link-layer type 300 * corresponding to OpenBSD DLT_PFLOG; DLT_PFLOG is 17 in OpenBSD, 301 * but that's DLT_LANE8023 in SuSE 6.3, so we can't use 17 for it 302 * in capture-file headers. 303 */ 304 #define DLT_PFLOG 117 305 306 /* 307 * Registered for Cisco-internal use. 308 */ 309 #define DLT_CISCO_IOS 118 310 311 /* 312 * Reserved for 802.11 cards using the Prism II chips, with a link-layer 313 * header including Prism monitor mode information plus an 802.11 314 * header. 315 */ 316 #define DLT_PRISM_HEADER 119 317 318 /* 319 * Reserved for Aironet 802.11 cards, with an Aironet link-layer header 320 * (see Doug Ambrisko's FreeBSD patches). 321 */ 322 #define DLT_AIRONET_HEADER 120 323 324 /* 325 * Reserved for Siemens HiPath HDLC. 326 */ 327 #define DLT_HHDLC 121 328 329 /* 330 * The instruction encodings. 331 */ 332 /* instruction classes */ 333 #define BPF_CLASS(code) ((code) & 0x07) 334 #define BPF_LD 0x00 335 #define BPF_LDX 0x01 336 #define BPF_ST 0x02 337 #define BPF_STX 0x03 338 #define BPF_ALU 0x04 339 #define BPF_JMP 0x05 340 #define BPF_RET 0x06 341 #define BPF_MISC 0x07 342 343 /* ld/ldx fields */ 344 #define BPF_SIZE(code) ((code) & 0x18) 345 #define BPF_W 0x00 346 #define BPF_H 0x08 347 #define BPF_B 0x10 348 #define BPF_MODE(code) ((code) & 0xe0) 349 #define BPF_IMM 0x00 350 #define BPF_ABS 0x20 351 #define BPF_IND 0x40 352 #define BPF_MEM 0x60 353 #define BPF_LEN 0x80 354 #define BPF_MSH 0xa0 355 356 /* alu/jmp fields */ 357 #define BPF_OP(code) ((code) & 0xf0) 358 #define BPF_ADD 0x00 359 #define BPF_SUB 0x10 360 #define BPF_MUL 0x20 361 #define BPF_DIV 0x30 362 #define BPF_OR 0x40 363 #define BPF_AND 0x50 364 #define BPF_LSH 0x60 365 #define BPF_RSH 0x70 366 #define BPF_NEG 0x80 367 #define BPF_JA 0x00 368 #define BPF_JEQ 0x10 369 #define BPF_JGT 0x20 370 #define BPF_JGE 0x30 371 #define BPF_JSET 0x40 372 #define BPF_SRC(code) ((code) & 0x08) 373 #define BPF_K 0x00 374 #define BPF_X 0x08 375 376 /* ret - BPF_K and BPF_X also apply */ 377 #define BPF_RVAL(code) ((code) & 0x18) 378 #define BPF_A 0x10 379 380 /* misc */ 381 #define BPF_MISCOP(code) ((code) & 0xf8) 382 #define BPF_TAX 0x00 383 #define BPF_TXA 0x80 384 385 /* 386 * The instruction data structure. 387 */ 388 struct bpf_insn { 389 u_short code; 390 u_char jt; 391 u_char jf; 392 bpf_int32 k; 393 }; 394 395 /* 396 * Macros for insn array initializers. 397 */ 398 #define BPF_STMT(code, k) { (u_short)(code), 0, 0, k } 399 #define BPF_JUMP(code, k, jt, jf) { (u_short)(code), jt, jf, k } 400 401 #if defined(BSD) && (defined(KERNEL) || defined(_KERNEL)) 402 /* 403 * Systems based on non-BSD kernels don't have ifnet's (or they don't mean 404 * anything if it is in <net/if.h>) and won't work like this. 405 */ 406 # if __STDC__ 407 extern void bpf_tap(struct ifnet *, u_char *, u_int); 408 extern void bpf_mtap(struct ifnet *, struct mbuf *); 409 extern void bpfattach(struct ifnet *, u_int, u_int); 410 extern void bpfilterattach(int); 411 # else 412 extern void bpf_tap(); 413 extern void bpf_mtap(); 414 extern void bpfattach(); 415 extern void bpfilterattach(); 416 # endif /* __STDC__ */ 417 #endif /* BSD && (_KERNEL || KERNEL) */ 418 #if __STDC__ 419 extern int bpf_validate(struct bpf_insn *, int); 420 extern u_int bpf_filter(struct bpf_insn *, u_char *, u_int, u_int); 421 #else 422 extern int bpf_validate(); 423 extern u_int bpf_filter(); 424 #endif 425 426 /* 427 * Number of scratch memory words (for BPF_LD|BPF_MEM and BPF_ST). 428 */ 429 #define BPF_MEMWORDS 16 430 431 #endif 432