1 2 /*- 3 * Copyright (c) 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997 4 * The Regents of the University of California. All rights reserved. 5 * 6 * This code is derived from the Stanford/CMU enet packet filter, 7 * (net/enet.c) distributed as part of 4.3BSD, and code contributed 8 * to Berkeley by Steven McCanne and Van Jacobson both of Lawrence 9 * Berkeley Laboratory. 10 * 11 * Redistribution and use in source and binary forms, with or without 12 * modification, are permitted provided that the following conditions 13 * are met: 14 * 1. Redistributions of source code must retain the above copyright 15 * notice, this list of conditions and the following disclaimer. 16 * 2. Redistributions in binary form must reproduce the above copyright 17 * notice, this list of conditions and the following disclaimer in the 18 * documentation and/or other materials provided with the distribution. 19 * 3. All advertising materials mentioning features or use of this software 20 * must display the following acknowledgement: 21 * This product includes software developed by the University of 22 * California, Berkeley and its contributors. 23 * 4. Neither the name of the University nor the names of its contributors 24 * may be used to endorse or promote products derived from this software 25 * without specific prior written permission. 26 * 27 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 28 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 29 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 30 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 31 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 32 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 33 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 34 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 35 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 36 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 37 * SUCH DAMAGE. 38 */ 39 40 #ifndef BPF_MAJOR_VERSION 41 42 #ifdef __cplusplus 43 extern "C" { 44 #endif 45 46 /* BSD style release date */ 47 #define BPF_RELEASE 199606 48 49 typedef int bpf_int32; 50 typedef u_int bpf_u_int32; 51 52 /* 53 * Alignment macros. BPF_WORDALIGN rounds up to the next 54 * even multiple of BPF_ALIGNMENT. 55 */ 56 #ifndef __NetBSD__ 57 #define BPF_ALIGNMENT sizeof(bpf_int32) 58 #else 59 #define BPF_ALIGNMENT sizeof(long) 60 #endif 61 #define BPF_WORDALIGN(x) (((x)+(BPF_ALIGNMENT-1))&~(BPF_ALIGNMENT-1)) 62 63 #define BPF_MAXINSNS 512 64 #define BPF_MAXBUFSIZE 0x8000 65 #define BPF_MINBUFSIZE 32 66 67 /* 68 * Structure for BIOCSETF. 69 */ 70 struct bpf_program { 71 u_int bf_len; 72 struct bpf_insn *bf_insns; 73 }; 74 75 /* 76 * Struct returned by BIOCGSTATS. 77 */ 78 struct bpf_stat { 79 u_int bs_recv; /* number of packets received */ 80 u_int bs_drop; /* number of packets dropped */ 81 }; 82 83 /* 84 * Struct return by BIOCVERSION. This represents the version number of 85 * the filter language described by the instruction encodings below. 86 * bpf understands a program iff kernel_major == filter_major && 87 * kernel_minor >= filter_minor, that is, if the value returned by the 88 * running kernel has the same major number and a minor number equal 89 * to or less than the filter being downloaded. Otherwise, the 90 * results are undefined, meaning an error may be returned or packets 91 * may be accepted haphazardly. 92 * It has nothing to do with the source code version. 93 */ 94 struct bpf_version { 95 u_short bv_major; 96 u_short bv_minor; 97 }; 98 /* Current version number of filter architecture. */ 99 #define BPF_MAJOR_VERSION 1 100 #define BPF_MINOR_VERSION 1 101 102 /* 103 * BPF ioctls 104 * 105 * The first set is for compatibility with Sun's pcc style 106 * header files. If your using gcc, we assume that you 107 * have run fixincludes so the latter set should work. 108 */ 109 #if (defined(sun) || defined(ibm032)) && !defined(__GNUC__) 110 #define BIOCGBLEN _IOR(B,102, u_int) 111 #define BIOCSBLEN _IOWR(B,102, u_int) 112 #define BIOCSETF _IOW(B,103, struct bpf_program) 113 #define BIOCFLUSH _IO(B,104) 114 #define BIOCPROMISC _IO(B,105) 115 #define BIOCGDLT _IOR(B,106, u_int) 116 #define BIOCGETIF _IOR(B,107, struct ifreq) 117 #define BIOCSETIF _IOW(B,108, struct ifreq) 118 #define BIOCSRTIMEOUT _IOW(B,109, struct timeval) 119 #define BIOCGRTIMEOUT _IOR(B,110, struct timeval) 120 #define BIOCGSTATS _IOR(B,111, struct bpf_stat) 121 #define BIOCIMMEDIATE _IOW(B,112, u_int) 122 #define BIOCVERSION _IOR(B,113, struct bpf_version) 123 #define BIOCSTCPF _IOW(B,114, struct bpf_program) 124 #define BIOCSUDPF _IOW(B,115, struct bpf_program) 125 #else 126 #define BIOCGBLEN _IOR('B',102, u_int) 127 #define BIOCSBLEN _IOWR('B',102, u_int) 128 #define BIOCSETF _IOW('B',103, struct bpf_program) 129 #define BIOCFLUSH _IO('B',104) 130 #define BIOCPROMISC _IO('B',105) 131 #define BIOCGDLT _IOR('B',106, u_int) 132 #define BIOCGETIF _IOR('B',107, struct ifreq) 133 #define BIOCSETIF _IOW('B',108, struct ifreq) 134 #define BIOCSRTIMEOUT _IOW('B',109, struct timeval) 135 #define BIOCGRTIMEOUT _IOR('B',110, struct timeval) 136 #define BIOCGSTATS _IOR('B',111, struct bpf_stat) 137 #define BIOCIMMEDIATE _IOW('B',112, u_int) 138 #define BIOCVERSION _IOR('B',113, struct bpf_version) 139 #define BIOCSTCPF _IOW('B',114, struct bpf_program) 140 #define BIOCSUDPF _IOW('B',115, struct bpf_program) 141 #endif 142 143 /* 144 * Structure prepended to each packet. 145 */ 146 struct bpf_hdr { 147 struct timeval bh_tstamp; /* time stamp */ 148 bpf_u_int32 bh_caplen; /* length of captured portion */ 149 bpf_u_int32 bh_datalen; /* original length of packet */ 150 u_short bh_hdrlen; /* length of bpf header (this struct 151 plus alignment padding) */ 152 }; 153 /* 154 * Because the structure above is not a multiple of 4 bytes, some compilers 155 * will insist on inserting padding; hence, sizeof(struct bpf_hdr) won't work. 156 * Only the kernel needs to know about it; applications use bh_hdrlen. 157 */ 158 #if defined(KERNEL) || defined(_KERNEL) 159 #define SIZEOF_BPF_HDR 18 160 #endif 161 162 /* 163 * Data-link level type codes. 164 */ 165 166 /* 167 * These are the types that are the same on all platforms; on other 168 * platforms, a <net/bpf.h> should be supplied that defines the additional 169 * DLT_* codes appropriately for that platform (the BSDs, for example, 170 * should not just pick up this version of "bpf.h"; they should also define 171 * the additional DLT_* codes used by their kernels, as well as the values 172 * defined here - and, if the values they use for particular DLT_ types 173 * differ from those here, they should use their values, not the ones 174 * here). 175 */ 176 #define DLT_NULL 0 /* no link-layer encapsulation */ 177 #define DLT_EN10MB 1 /* Ethernet (10Mb) */ 178 #define DLT_EN3MB 2 /* Experimental Ethernet (3Mb) */ 179 #define DLT_AX25 3 /* Amateur Radio AX.25 */ 180 #define DLT_PRONET 4 /* Proteon ProNET Token Ring */ 181 #define DLT_CHAOS 5 /* Chaos */ 182 #define DLT_IEEE802 6 /* IEEE 802 Networks */ 183 #define DLT_ARCNET 7 /* ARCNET */ 184 #define DLT_SLIP 8 /* Serial Line IP */ 185 #define DLT_PPP 9 /* Point-to-point Protocol */ 186 #define DLT_FDDI 10 /* FDDI */ 187 188 /* 189 * These are values from the traditional libpcap "bpf.h". 190 * Ports of this to particular platforms should replace these definitions 191 * with the ones appropriate to that platform, if the values are 192 * different on that platform. 193 */ 194 #define DLT_ATM_RFC1483 11 /* LLC/SNAP encapsulated atm */ 195 #define DLT_RAW 12 /* raw IP */ 196 197 /* 198 * These are values from BSD/OS's "bpf.h". 199 * These are not the same as the values from the traditional libpcap 200 * "bpf.h"; however, these values shouldn't be generated by any 201 * OS other than BSD/OS, so the correct values to use here are the 202 * BSD/OS values. 203 * 204 * Platforms that have already assigned these values to other 205 * DLT_ codes, however, should give these codes the values 206 * from that platform, so that programs that use these codes will 207 * continue to compile - even though they won't correctly read 208 * files of these types. 209 */ 210 #ifdef __NetBSD__ 211 #ifndef DLT_SLIP_BSDOS 212 #define DLT_SLIP_BSDOS 13 /* BSD/OS Serial Line IP */ 213 #define DLT_PPP_BSDOS 14 /* BSD/OS Point-to-point Protocol */ 214 #endif 215 #else 216 #define DLT_SLIP_BSDOS 15 /* BSD/OS Serial Line IP */ 217 #define DLT_PPP_BSDOS 16 /* BSD/OS Point-to-point Protocol */ 218 #endif 219 220 #define DLT_ATM_CLIP 19 /* Linux Classical-IP over ATM */ 221 222 /* 223 * These values are defined by NetBSD; other platforms should refrain from 224 * using them for other purposes, so that NetBSD savefiles with link 225 * types of 50 or 51 can be read as this type on all platforms. 226 */ 227 #define DLT_PPP_SERIAL 50 /* PPP over serial with HDLC encapsulation */ 228 #define DLT_PPP_ETHER 51 /* PPP over Ethernet */ 229 230 /* 231 * Values between 100 and 103 are used in capture file headers as 232 * link-layer types corresponding to DLT_ types that differ 233 * between platforms; don't use those values for new DLT_ new types. 234 */ 235 236 /* 237 * This value was defined by libpcap 0.5; platforms that have defined 238 * it with a different value should define it here with that value - 239 * a link type of 104 in a save file will be mapped to DLT_C_HDLC, 240 * whatever value that happens to be, so programs will correctly 241 * handle files with that link type regardless of the value of 242 * DLT_C_HDLC. 243 * 244 * The name DLT_C_HDLC was used by BSD/OS; we use that name for source 245 * compatibility with programs written for BSD/OS. 246 * 247 * libpcap 0.5 defined it as DLT_CHDLC; we define DLT_CHDLC as well, 248 * for source compatibility with programs written for libpcap 0.5. 249 */ 250 #define DLT_C_HDLC 104 /* Cisco HDLC */ 251 #define DLT_CHDLC DLT_C_HDLC 252 253 #define DLT_IEEE802_11 105 /* IEEE 802.11 wireless */ 254 255 /* 256 * Values between 106 and 107 are used in capture file headers as 257 * link-layer types corresponding to DLT_ types that might differ 258 * between platforms; don't use those values for new DLT_ new types. 259 */ 260 261 /* 262 * OpenBSD DLT_LOOP, for loopback devices; it's like DLT_NULL, except 263 * that the AF_ type in the link-layer header is in network byte order. 264 * 265 * OpenBSD defines it as 12, but that collides with DLT_RAW, so we 266 * define it as 108 here. If OpenBSD picks up this file, it should 267 * define DLT_LOOP as 12 in its version, as per the comment above - 268 * and should not use 108 as a DLT_ value. 269 */ 270 #define DLT_LOOP 108 271 272 /* 273 * Values between 109 and 112 are used in capture file headers as 274 * link-layer types corresponding to DLT_ types that might differ 275 * between platforms; don't use those values for new DLT_ types 276 * other than the corresponding DLT_ types. 277 */ 278 279 /* 280 * This is for Linux cooked sockets. 281 */ 282 #define DLT_LINUX_SLL 113 283 284 /* 285 * Apple LocalTalk hardware. 286 */ 287 #define DLT_LTALK 114 288 289 /* 290 * Acorn Econet. 291 */ 292 #define DLT_ECONET 115 293 294 /* 295 * Reserved for use with OpenBSD ipfilter. 296 */ 297 #define DLT_IPFILTER 116 298 299 /* 300 * Reserved for use in capture-file headers as a link-layer type 301 * corresponding to OpenBSD DLT_PFLOG; DLT_PFLOG is 17 in OpenBSD, 302 * but that's DLT_LANE8023 in SuSE 6.3, so we can't use 17 for it 303 * in capture-file headers. 304 */ 305 #define DLT_PFLOG 117 306 307 /* 308 * Registered for Cisco-internal use. 309 */ 310 #define DLT_CISCO_IOS 118 311 312 /* 313 * Reserved for 802.11 cards using the Prism II chips, with a link-layer 314 * header including Prism monitor mode information plus an 802.11 315 * header. 316 */ 317 #define DLT_PRISM_HEADER 119 318 319 /* 320 * Reserved for Aironet 802.11 cards, with an Aironet link-layer header 321 * (see Doug Ambrisko's FreeBSD patches). 322 */ 323 #define DLT_AIRONET_HEADER 120 324 325 /* 326 * Reserved for Siemens HiPath HDLC. 327 */ 328 #define DLT_HHDLC 121 329 330 /* 331 * Reserved for RFC 2625 IP-over-Fibre Channel, as per a request from 332 * Don Lee <donlee@cray.com>. 333 * 334 * This is not for use with raw Fibre Channel, where the link-layer 335 * header starts with a Fibre Channel frame header; it's for IP-over-FC, 336 * where the link-layer header starts with an RFC 2625 Network_Header 337 * field. 338 */ 339 #define DLT_IP_OVER_FC 122 340 341 /* 342 * The instruction encodings. 343 */ 344 /* instruction classes */ 345 #define BPF_CLASS(code) ((code) & 0x07) 346 #define BPF_LD 0x00 347 #define BPF_LDX 0x01 348 #define BPF_ST 0x02 349 #define BPF_STX 0x03 350 #define BPF_ALU 0x04 351 #define BPF_JMP 0x05 352 #define BPF_RET 0x06 353 #define BPF_MISC 0x07 354 355 /* ld/ldx fields */ 356 #define BPF_SIZE(code) ((code) & 0x18) 357 #define BPF_W 0x00 358 #define BPF_H 0x08 359 #define BPF_B 0x10 360 #define BPF_MODE(code) ((code) & 0xe0) 361 #define BPF_IMM 0x00 362 #define BPF_ABS 0x20 363 #define BPF_IND 0x40 364 #define BPF_MEM 0x60 365 #define BPF_LEN 0x80 366 #define BPF_MSH 0xa0 367 368 /* alu/jmp fields */ 369 #define BPF_OP(code) ((code) & 0xf0) 370 #define BPF_ADD 0x00 371 #define BPF_SUB 0x10 372 #define BPF_MUL 0x20 373 #define BPF_DIV 0x30 374 #define BPF_OR 0x40 375 #define BPF_AND 0x50 376 #define BPF_LSH 0x60 377 #define BPF_RSH 0x70 378 #define BPF_NEG 0x80 379 #define BPF_JA 0x00 380 #define BPF_JEQ 0x10 381 #define BPF_JGT 0x20 382 #define BPF_JGE 0x30 383 #define BPF_JSET 0x40 384 #define BPF_SRC(code) ((code) & 0x08) 385 #define BPF_K 0x00 386 #define BPF_X 0x08 387 388 /* ret - BPF_K and BPF_X also apply */ 389 #define BPF_RVAL(code) ((code) & 0x18) 390 #define BPF_A 0x10 391 392 /* misc */ 393 #define BPF_MISCOP(code) ((code) & 0xf8) 394 #define BPF_TAX 0x00 395 #define BPF_TXA 0x80 396 397 /* 398 * The instruction data structure. 399 */ 400 struct bpf_insn { 401 u_short code; 402 u_char jt; 403 u_char jf; 404 bpf_int32 k; 405 }; 406 407 /* 408 * Macros for insn array initializers. 409 */ 410 #define BPF_STMT(code, k) { (u_short)(code), 0, 0, k } 411 #define BPF_JUMP(code, k, jt, jf) { (u_short)(code), jt, jf, k } 412 413 #if defined(BSD) && (defined(KERNEL) || defined(_KERNEL)) 414 /* 415 * Systems based on non-BSD kernels don't have ifnet's (or they don't mean 416 * anything if it is in <net/if.h>) and won't work like this. 417 */ 418 extern void bpf_tap(struct ifnet *, u_char *, u_int); 419 extern void bpf_mtap(struct ifnet *, struct mbuf *); 420 extern void bpfattach(struct ifnet *, u_int, u_int); 421 extern void bpfilterattach(int); 422 #endif /* BSD && (_KERNEL || KERNEL) */ 423 extern int bpf_validate(struct bpf_insn *, int); 424 extern u_int bpf_filter(struct bpf_insn *, u_char *, u_int, u_int); 425 426 /* 427 * Number of scratch memory words (for BPF_LD|BPF_MEM and BPF_ST). 428 */ 429 #define BPF_MEMWORDS 16 430 431 #ifdef __cplusplus 432 } 433 #endif 434 435 #endif 436