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 * $DragonFly: src/sys/net/bpf.h,v 1.11 2006/05/20 16:48:51 dillon Exp $ 43 */ 44 45 #ifndef _NET_BPF_H_ 46 #define _NET_BPF_H_ 47 48 #ifndef _SYS_TYPES_H_ 49 #include <sys/types.h> 50 #endif 51 #ifndef _SYS_TIME_H_ 52 #include <sys/time.h> 53 #endif 54 55 /* BSD style release date */ 56 #define BPF_RELEASE 199606 57 58 typedef int32_t bpf_int32; 59 typedef u_int32_t bpf_u_int32; 60 61 /* 62 * Alignment macros. BPF_WORDALIGN rounds up to the next 63 * even multiple of BPF_ALIGNMENT. 64 */ 65 #define BPF_ALIGNMENT sizeof(long) 66 #define BPF_WORDALIGN(x) (((x)+(BPF_ALIGNMENT-1))&~(BPF_ALIGNMENT-1)) 67 68 #define BPF_MAXINSNS 512 69 #define BPF_MAXBUFSIZE 0x80000 70 #define BPF_DEFAULTBUFSIZE 4096 71 #define BPF_MINBUFSIZE 32 72 73 /* 74 * Structure for BIOCSETF. 75 */ 76 struct bpf_program { 77 u_int bf_len; 78 struct bpf_insn *bf_insns; 79 }; 80 81 /* 82 * Struct returned by BIOCGSTATS. 83 */ 84 struct bpf_stat { 85 u_int bs_recv; /* number of packets received */ 86 u_int bs_drop; /* number of packets dropped */ 87 }; 88 89 /* 90 * Struct return by BIOCVERSION. This represents the version number of 91 * the filter language described by the instruction encodings below. 92 * bpf understands a program iff kernel_major == filter_major && 93 * kernel_minor >= filter_minor, that is, if the value returned by the 94 * running kernel has the same major number and a minor number equal 95 * equal to or less than the filter being downloaded. Otherwise, the 96 * results are undefined, meaning an error may be returned or packets 97 * may be accepted haphazardly. 98 * It has nothing to do with the source code version. 99 */ 100 struct bpf_version { 101 u_short bv_major; 102 u_short bv_minor; 103 }; 104 /* Current version number of filter architecture. */ 105 #define BPF_MAJOR_VERSION 1 106 #define BPF_MINOR_VERSION 1 107 108 #define BIOCGBLEN _IOR('B',102, u_int) 109 #define BIOCSBLEN _IOWR('B',102, u_int) 110 #define BIOCSETF _IOW('B',103, struct bpf_program) 111 #define BIOCFLUSH _IO('B',104) 112 #define BIOCPROMISC _IO('B',105) 113 #define BIOCGDLT _IOR('B',106, u_int) 114 #define BIOCGETIF _IOR('B',107, struct ifreq) 115 #define BIOCSETIF _IOW('B',108, struct ifreq) 116 #define BIOCSRTIMEOUT _IOW('B',109, struct timeval) 117 #define BIOCGRTIMEOUT _IOR('B',110, struct timeval) 118 #define BIOCGSTATS _IOR('B',111, struct bpf_stat) 119 #define BIOCIMMEDIATE _IOW('B',112, u_int) 120 #define BIOCVERSION _IOR('B',113, struct bpf_version) 121 #define BIOCGRSIG _IOR('B',114, u_int) 122 #define BIOCSRSIG _IOW('B',115, u_int) 123 #define BIOCGHDRCMPLT _IOR('B',116, u_int) 124 #define BIOCSHDRCMPLT _IOW('B',117, u_int) 125 #define BIOCGSEESENT _IOR('B',118, u_int) 126 #define BIOCSSEESENT _IOW('B',119, u_int) 127 #define BIOCSDLT _IOW('B',120, u_int) 128 #define BIOCGDLTLIST _IOWR('B',121, struct bpf_dltlist) 129 130 /* 131 * Structure prepended to each packet. 132 */ 133 struct bpf_hdr { 134 struct timeval bh_tstamp; /* time stamp */ 135 bpf_u_int32 bh_caplen; /* length of captured portion */ 136 bpf_u_int32 bh_datalen; /* original length of packet */ 137 u_short bh_hdrlen; /* length of bpf header (this struct 138 plus alignment padding) */ 139 }; 140 /* 141 * Because the structure above is not a multiple of 4 bytes, some compilers 142 * will insist on inserting padding; hence, sizeof(struct bpf_hdr) won't work. 143 * Only the kernel needs to know about it; applications use bh_hdrlen. 144 */ 145 #ifdef _KERNEL 146 #define SIZEOF_BPF_HDR (sizeof(struct bpf_hdr) <= 20 ? 18 : \ 147 sizeof(struct bpf_hdr)) 148 #endif 149 150 /* 151 * Data-link level type codes. 152 */ 153 #define DLT_NULL 0 /* no link-layer encapsulation */ 154 #define DLT_EN10MB 1 /* Ethernet (10Mb) */ 155 #define DLT_EN3MB 2 /* Experimental Ethernet (3Mb) */ 156 #define DLT_AX25 3 /* Amateur Radio AX.25 */ 157 #define DLT_PRONET 4 /* Proteon ProNET Token Ring */ 158 #define DLT_CHAOS 5 /* Chaos */ 159 #define DLT_IEEE802 6 /* IEEE 802 Networks */ 160 #define DLT_ARCNET 7 /* ARCNET */ 161 #define DLT_SLIP 8 /* Serial Line IP */ 162 #define DLT_PPP 9 /* Point-to-point Protocol */ 163 #define DLT_FDDI 10 /* FDDI */ 164 #define DLT_ATM_RFC1483 11 /* LLC/SNAP encapsulated atm */ 165 #define DLT_RAW 12 /* raw IP */ 166 167 /* 168 * These are values from BSD/OS's "bpf.h". 169 * These are not the same as the values from the traditional libpcap 170 * "bpf.h"; however, these values shouldn't be generated by any 171 * OS other than BSD/OS, so the correct values to use here are the 172 * BSD/OS values. 173 * 174 * Platforms that have already assigned these values to other 175 * DLT_ codes, however, should give these codes the values 176 * from that platform, so that programs that use these codes will 177 * continue to compile - even though they won't correctly read 178 * files of these types. 179 */ 180 #define DLT_SLIP_BSDOS 15 /* BSD/OS Serial Line IP */ 181 #define DLT_PPP_BSDOS 16 /* BSD/OS Point-to-point Protocol */ 182 183 #define DLT_ATM_CLIP 19 /* Linux Classical-IP over ATM */ 184 185 /* 186 * These values are defined by NetBSD; other platforms should refrain from 187 * using them for other purposes, so that NetBSD savefiles with link 188 * types of 50 or 51 can be read as this type on all platforms. 189 */ 190 #define DLT_PPP_SERIAL 50 /* PPP over serial with HDLC encapsulation */ 191 #define DLT_PPP_ETHER 51 /* PPP over Ethernet */ 192 193 /* 194 * This value was defined by libpcap 0.5; platforms that have defined 195 * it with a different value should define it here with that value - 196 * a link type of 104 in a save file will be mapped to DLT_C_HDLC, 197 * whatever value that happens to be, so programs will correctly 198 * handle files with that link type regardless of the value of 199 * DLT_C_HDLC. 200 * 201 * The name DLT_C_HDLC was used by BSD/OS; we use that name for source 202 * compatibility with programs written for BSD/OS. 203 * 204 * libpcap 0.5 defined it as DLT_CHDLC; we define DLT_CHDLC as well, 205 * for source compatibility with programs written for libpcap 0.5. 206 */ 207 #define DLT_C_HDLC 104 /* Cisco HDLC */ 208 #define DLT_CHDLC DLT_C_HDLC 209 210 #define DLT_IEEE802_11 105 /* IEEE 802.11 wireless */ 211 212 /* 213 * Values between 106 and 107 are used in capture file headers as 214 * link-layer types corresponding to DLT_ types that might differ 215 * between platforms; don't use those values for new DLT_ new types. 216 */ 217 218 /* 219 * OpenBSD DLT_LOOP, for loopback devices; it's like DLT_NULL, except 220 * that the AF_ type in the link-layer header is in network byte order. 221 * 222 * OpenBSD defines it as 12, but that collides with DLT_RAW, so we 223 * define it as 108 here. If OpenBSD picks up this file, it should 224 * define DLT_LOOP as 12 in its version, as per the comment above - 225 * and should not use 108 as a DLT_ value. 226 */ 227 #define DLT_LOOP 108 228 229 /* 230 * Values between 109 and 112 are used in capture file headers as 231 * link-layer types corresponding to DLT_ types that might differ 232 * between platforms; don't use those values for new DLT_ new types. 233 */ 234 235 /* 236 * This is for Linux cooked sockets. 237 */ 238 #define DLT_LINUX_SLL 113 239 240 /* 241 * Apple LocalTalk hardware. 242 */ 243 #define DLT_LTALK 114 244 245 /* 246 * Acorn Econet. 247 */ 248 #define DLT_ECONET 115 249 250 /* 251 * Reserved for use with OpenBSD ipfilter. 252 */ 253 #define DLT_IPFILTER 116 254 255 /* 256 * Reserved for use in capture-file headers as a link-layer type 257 * corresponding to OpenBSD DLT_PFLOG; DLT_PFLOG is 17 in OpenBSD, 258 * but that's DLT_LANE8023 in SuSE 6.3, so we can't use 17 for it 259 * in capture-file headers. 260 */ 261 #define DLT_PFLOG 117 262 263 /* 264 * Registered for Cisco-internal use. 265 */ 266 #define DLT_CISCO_IOS 118 267 268 /* 269 * Reserved for 802.11 cards using the Prism II chips, with a link-layer 270 * header including Prism monitor mode information plus an 802.11 271 * header. 272 */ 273 #define DLT_PRISM_HEADER 119 274 275 /* 276 * Reserved for Aironet 802.11 cards, with an Aironet link-layer header 277 * (see Doug Ambrisko's FreeBSD patches). 278 */ 279 #define DLT_AIRONET_HEADER 120 280 281 /* 282 * Reserved for use by OpenBSD's pfsync device. 283 */ 284 #define DLT_PFSYNC 121 285 286 /* 287 * The instruction encodings. 288 */ 289 /* instruction classes */ 290 #define BPF_CLASS(code) ((code) & 0x07) 291 #define BPF_LD 0x00 292 #define BPF_LDX 0x01 293 #define BPF_ST 0x02 294 #define BPF_STX 0x03 295 #define BPF_ALU 0x04 296 #define BPF_JMP 0x05 297 #define BPF_RET 0x06 298 #define BPF_MISC 0x07 299 300 /* ld/ldx fields */ 301 #define BPF_SIZE(code) ((code) & 0x18) 302 #define BPF_W 0x00 303 #define BPF_H 0x08 304 #define BPF_B 0x10 305 #define BPF_MODE(code) ((code) & 0xe0) 306 #define BPF_IMM 0x00 307 #define BPF_ABS 0x20 308 #define BPF_IND 0x40 309 #define BPF_MEM 0x60 310 #define BPF_LEN 0x80 311 #define BPF_MSH 0xa0 312 313 /* alu/jmp fields */ 314 #define BPF_OP(code) ((code) & 0xf0) 315 #define BPF_ADD 0x00 316 #define BPF_SUB 0x10 317 #define BPF_MUL 0x20 318 #define BPF_DIV 0x30 319 #define BPF_OR 0x40 320 #define BPF_AND 0x50 321 #define BPF_LSH 0x60 322 #define BPF_RSH 0x70 323 #define BPF_NEG 0x80 324 #define BPF_JA 0x00 325 #define BPF_JEQ 0x10 326 #define BPF_JGT 0x20 327 #define BPF_JGE 0x30 328 #define BPF_JSET 0x40 329 #define BPF_SRC(code) ((code) & 0x08) 330 #define BPF_K 0x00 331 #define BPF_X 0x08 332 333 /* ret - BPF_K and BPF_X also apply */ 334 #define BPF_RVAL(code) ((code) & 0x18) 335 #define BPF_A 0x10 336 337 /* misc */ 338 #define BPF_MISCOP(code) ((code) & 0xf8) 339 #define BPF_TAX 0x00 340 #define BPF_TXA 0x80 341 342 /* 343 * The instruction data structure. 344 */ 345 struct bpf_insn { 346 u_short code; 347 u_char jt; 348 u_char jf; 349 bpf_u_int32 k; 350 }; 351 352 /* 353 * Macros for insn array initializers. 354 */ 355 #define BPF_STMT(code, k) { (u_short)(code), 0, 0, k } 356 #define BPF_JUMP(code, k, jt, jf) { (u_short)(code), jt, jf, k } 357 358 /* 359 * Structure to retrieve available DLTs for the interface. 360 */ 361 struct bpf_dltlist { 362 u_int bfl_len; /* number of bfd_list array */ 363 u_int *bfl_list; /* array of DLTs */ 364 }; 365 366 #ifdef _KERNEL 367 struct bpf_if; 368 struct ifnet; 369 struct mbuf; 370 371 int bpf_validate(const struct bpf_insn *, int); 372 void bpf_tap(struct bpf_if *, u_char *, u_int); 373 void bpf_mtap(struct bpf_if *, struct mbuf *); 374 void bpf_mtap_family(struct bpf_if *, struct mbuf *m, __uint8_t family); 375 void bpf_ptap(struct bpf_if *, struct mbuf *, const void *, u_int); 376 void bpfattach(struct ifnet *, u_int, u_int); 377 void bpfattach_dlt(struct ifnet *, u_int, u_int, struct bpf_if **); 378 void bpfdetach(struct ifnet *); 379 380 void bpfilterattach(int); 381 u_int bpf_filter(const struct bpf_insn *, u_char *, u_int, u_int); 382 383 #define BPF_TAP(_ifp,_pkt,_pktlen) do { \ 384 if ((_ifp)->if_bpf) \ 385 bpf_tap((_ifp)->if_bpf, (_pkt), (_pktlen)); \ 386 } while (0) 387 #define BPF_MTAP(_ifp,_m) do { \ 388 if ((_ifp)->if_bpf) \ 389 bpf_mtap((_ifp)->if_bpf, (_m)); \ 390 } while (0) 391 #endif 392 393 /* 394 * Number of scratch memory words (for BPF_LD|BPF_MEM and BPF_ST). 395 */ 396 #define BPF_MEMWORDS 16 397 398 #endif 399