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 * 4. Neither the name of the University nor the names of its contributors 19 * may be used to endorse or promote products derived from this software 20 * without specific prior written permission. 21 * 22 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 23 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 25 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 26 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 27 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 28 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 29 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 32 * SUCH DAMAGE. 33 * 34 * @(#)bpf.h 8.1 (Berkeley) 6/10/93 35 * @(#)bpf.h 1.34 (LBL) 6/16/96 36 * 37 * $FreeBSD$ 38 */ 39 40 #ifndef _NET_BPF_H_ 41 #define _NET_BPF_H_ 42 43 /* BSD style release date */ 44 #define BPF_RELEASE 199606 45 46 typedef int32_t bpf_int32; 47 typedef u_int32_t bpf_u_int32; 48 49 /* 50 * Alignment macros. BPF_WORDALIGN rounds up to the next 51 * even multiple of BPF_ALIGNMENT. 52 */ 53 #define BPF_ALIGNMENT sizeof(long) 54 #define BPF_WORDALIGN(x) (((x)+(BPF_ALIGNMENT-1))&~(BPF_ALIGNMENT-1)) 55 56 #define BPF_MAXINSNS 512 57 #define BPF_MAXBUFSIZE 0x80000 58 #define BPF_MINBUFSIZE 32 59 60 /* 61 * Structure for BIOCSETF. 62 */ 63 struct bpf_program { 64 u_int bf_len; 65 struct bpf_insn *bf_insns; 66 }; 67 68 /* 69 * Struct returned by BIOCGSTATS. 70 */ 71 struct bpf_stat { 72 u_int bs_recv; /* number of packets received */ 73 u_int bs_drop; /* number of packets dropped */ 74 }; 75 76 /* 77 * Struct return by BIOCVERSION. This represents the version number of 78 * the filter language described by the instruction encodings below. 79 * bpf understands a program iff kernel_major == filter_major && 80 * kernel_minor >= filter_minor, that is, if the value returned by the 81 * running kernel has the same major number and a minor number equal 82 * equal to or less than the filter being downloaded. Otherwise, the 83 * results are undefined, meaning an error may be returned or packets 84 * may be accepted haphazardly. 85 * It has nothing to do with the source code version. 86 */ 87 struct bpf_version { 88 u_short bv_major; 89 u_short bv_minor; 90 }; 91 /* Current version number of filter architecture. */ 92 #define BPF_MAJOR_VERSION 1 93 #define BPF_MINOR_VERSION 1 94 95 #define BIOCGBLEN _IOR('B',102, u_int) 96 #define BIOCSBLEN _IOWR('B',102, u_int) 97 #define BIOCSETF _IOW('B',103, struct bpf_program) 98 #define BIOCFLUSH _IO('B',104) 99 #define BIOCPROMISC _IO('B',105) 100 #define BIOCGDLT _IOR('B',106, u_int) 101 #define BIOCGETIF _IOR('B',107, struct ifreq) 102 #define BIOCSETIF _IOW('B',108, struct ifreq) 103 #define BIOCSRTIMEOUT _IOW('B',109, struct timeval) 104 #define BIOCGRTIMEOUT _IOR('B',110, struct timeval) 105 #define BIOCGSTATS _IOR('B',111, struct bpf_stat) 106 #define BIOCIMMEDIATE _IOW('B',112, u_int) 107 #define BIOCVERSION _IOR('B',113, struct bpf_version) 108 #define BIOCGRSIG _IOR('B',114, u_int) 109 #define BIOCSRSIG _IOW('B',115, u_int) 110 #define BIOCGHDRCMPLT _IOR('B',116, u_int) 111 #define BIOCSHDRCMPLT _IOW('B',117, u_int) 112 #define BIOCGSEESENT _IOR('B',118, u_int) 113 #define BIOCSSEESENT _IOW('B',119, u_int) 114 #define BIOCSDLT _IOW('B',120, u_int) 115 #define BIOCGDLTLIST _IOWR('B',121, struct bpf_dltlist) 116 117 /* 118 * Structure prepended to each packet. 119 */ 120 struct bpf_hdr { 121 struct timeval bh_tstamp; /* time stamp */ 122 bpf_u_int32 bh_caplen; /* length of captured portion */ 123 bpf_u_int32 bh_datalen; /* original length of packet */ 124 u_short bh_hdrlen; /* length of bpf header (this struct 125 plus alignment padding) */ 126 }; 127 /* 128 * Because the structure above is not a multiple of 4 bytes, some compilers 129 * will insist on inserting padding; hence, sizeof(struct bpf_hdr) won't work. 130 * Only the kernel needs to know about it; applications use bh_hdrlen. 131 */ 132 #ifdef _KERNEL 133 #define SIZEOF_BPF_HDR (sizeof(struct bpf_hdr) <= 20 ? 18 : \ 134 sizeof(struct bpf_hdr)) 135 #endif 136 137 /* 138 * Data-link level type codes. 139 */ 140 #define DLT_NULL 0 /* BSD loopback encapsulation */ 141 #define DLT_EN10MB 1 /* Ethernet (10Mb) */ 142 #define DLT_EN3MB 2 /* Experimental Ethernet (3Mb) */ 143 #define DLT_AX25 3 /* Amateur Radio AX.25 */ 144 #define DLT_PRONET 4 /* Proteon ProNET Token Ring */ 145 #define DLT_CHAOS 5 /* Chaos */ 146 #define DLT_IEEE802 6 /* IEEE 802 Networks */ 147 #define DLT_ARCNET 7 /* ARCNET */ 148 #define DLT_SLIP 8 /* Serial Line IP */ 149 #define DLT_PPP 9 /* Point-to-point Protocol */ 150 #define DLT_FDDI 10 /* FDDI */ 151 #define DLT_ATM_RFC1483 11 /* LLC/SNAP encapsulated atm */ 152 #define DLT_RAW 12 /* raw IP */ 153 154 /* 155 * These are values from BSD/OS's "bpf.h". 156 * These are not the same as the values from the traditional libpcap 157 * "bpf.h"; however, these values shouldn't be generated by any 158 * OS other than BSD/OS, so the correct values to use here are the 159 * BSD/OS values. 160 * 161 * Platforms that have already assigned these values to other 162 * DLT_ codes, however, should give these codes the values 163 * from that platform, so that programs that use these codes will 164 * continue to compile - even though they won't correctly read 165 * files of these types. 166 */ 167 #define DLT_SLIP_BSDOS 15 /* BSD/OS Serial Line IP */ 168 #define DLT_PPP_BSDOS 16 /* BSD/OS Point-to-point Protocol */ 169 170 #define DLT_ATM_CLIP 19 /* Linux Classical-IP over ATM */ 171 172 /* 173 * These values are defined by NetBSD; other platforms should refrain from 174 * using them for other purposes, so that NetBSD savefiles with link 175 * types of 50 or 51 can be read as this type on all platforms. 176 */ 177 #define DLT_PPP_SERIAL 50 /* PPP over serial with HDLC encapsulation */ 178 #define DLT_PPP_ETHER 51 /* PPP over Ethernet */ 179 180 /* 181 * Reserved for the Symantec Enterprise Firewall. 182 */ 183 #define DLT_SYMANTEC_FIREWALL 99 184 185 186 /* 187 * This value was defined by libpcap 0.5; platforms that have defined 188 * it with a different value should define it here with that value - 189 * a link type of 104 in a save file will be mapped to DLT_C_HDLC, 190 * whatever value that happens to be, so programs will correctly 191 * handle files with that link type regardless of the value of 192 * DLT_C_HDLC. 193 * 194 * The name DLT_C_HDLC was used by BSD/OS; we use that name for source 195 * compatibility with programs written for BSD/OS. 196 * 197 * libpcap 0.5 defined it as DLT_CHDLC; we define DLT_CHDLC as well, 198 * for source compatibility with programs written for libpcap 0.5. 199 */ 200 #define DLT_C_HDLC 104 /* Cisco HDLC */ 201 #define DLT_CHDLC DLT_C_HDLC 202 203 #define DLT_IEEE802_11 105 /* IEEE 802.11 wireless */ 204 205 /* 206 * Values between 106 and 107 are used in capture file headers as 207 * link-layer types corresponding to DLT_ types that might differ 208 * between platforms; don't use those values for new DLT_ new types. 209 */ 210 211 /* 212 * Frame Relay; BSD/OS has a DLT_FR with a value of 11, but that collides 213 * with other values. 214 * DLT_FR and DLT_FRELAY packets start with the Q.922 Frame Relay header 215 * (DLCI, etc.). 216 */ 217 #define DLT_FRELAY 107 218 219 /* 220 * OpenBSD DLT_LOOP, for loopback devices; it's like DLT_NULL, except 221 * that the AF_ type in the link-layer header is in network byte order. 222 * 223 * OpenBSD defines it as 12, but that collides with DLT_RAW, so we 224 * define it as 108 here. If OpenBSD picks up this file, it should 225 * define DLT_LOOP as 12 in its version, as per the comment above - 226 * and should not use 108 as a DLT_ value. 227 */ 228 #define DLT_LOOP 108 229 230 /* 231 * Values between 109 and 112 are used in capture file headers as 232 * link-layer types corresponding to DLT_ types that might differ 233 * between platforms; don't use those values for new DLT_ new types. 234 */ 235 236 /* 237 * Encapsulated packets for IPsec; DLT_ENC is 13 in OpenBSD, but that's 238 * DLT_SLIP_BSDOS in NetBSD, so we don't use 13 for it in OSes other 239 * than OpenBSD. 240 */ 241 #define DLT_ENC 109 242 243 /* 244 * This is for Linux cooked sockets. 245 */ 246 #define DLT_LINUX_SLL 113 247 248 /* 249 * Apple LocalTalk hardware. 250 */ 251 #define DLT_LTALK 114 252 253 /* 254 * Acorn Econet. 255 */ 256 #define DLT_ECONET 115 257 258 /* 259 * Reserved for use with OpenBSD ipfilter. 260 */ 261 #define DLT_IPFILTER 116 262 263 /* 264 * Reserved for use in capture-file headers as a link-layer type 265 * corresponding to OpenBSD DLT_PFLOG; DLT_PFLOG is 17 in OpenBSD, 266 * but that's DLT_LANE8023 in SuSE 6.3, so we can't use 17 for it 267 * in capture-file headers. 268 */ 269 #define DLT_PFLOG 117 270 271 /* 272 * Registered for Cisco-internal use. 273 */ 274 #define DLT_CISCO_IOS 118 275 276 /* 277 * Reserved for 802.11 cards using the Prism II chips, with a link-layer 278 * header including Prism monitor mode information plus an 802.11 279 * header. 280 */ 281 #define DLT_PRISM_HEADER 119 282 283 /* 284 * Reserved for Aironet 802.11 cards, with an Aironet link-layer header 285 * (see Doug Ambrisko's FreeBSD patches). 286 */ 287 #define DLT_AIRONET_HEADER 120 288 289 /* 290 * Reserved for use by OpenBSD's pfsync device. 291 */ 292 #define DLT_PFSYNC 121 293 294 /* 295 * Reserved for Siemens HiPath HDLC. XXX 296 */ 297 #define DLT_HHDLC 121 298 299 /* 300 * Reserved for RFC 2625 IP-over-Fibre Channel. 301 */ 302 #define DLT_IP_OVER_FC 122 303 304 /* 305 * Reserved for Full Frontal ATM on Solaris. 306 */ 307 #define DLT_SUNATM 123 308 309 /* 310 * Reserved as per request from Kent Dahlgren <kent@praesum.com> 311 * for private use. 312 */ 313 #define DLT_RIO 124 /* RapidIO */ 314 #define DLT_PCI_EXP 125 /* PCI Express */ 315 #define DLT_AURORA 126 /* Xilinx Aurora link layer */ 316 317 /* 318 * BSD header for 802.11 plus a number of bits of link-layer information 319 * including radio information. 320 */ 321 #ifndef DLT_IEEE802_11_RADIO 322 #define DLT_IEEE802_11_RADIO 127 323 #endif 324 325 /* 326 * Reserved for TZSP encapsulation. 327 */ 328 #define DLT_TZSP 128 /* Tazmen Sniffer Protocol */ 329 330 /* 331 * Reserved for Linux ARCNET. 332 */ 333 #define DLT_ARCNET_LINUX 129 334 335 /* 336 * Juniper-private data link types. 337 */ 338 #define DLT_JUNIPER_MLPPP 130 339 #define DLT_JUNIPER_MLFR 131 340 #define DLT_JUNIPER_ES 132 341 #define DLT_JUNIPER_GGSN 133 342 #define DLT_JUNIPER_MFR 134 343 #define DLT_JUNIPER_ATM2 135 344 #define DLT_JUNIPER_SERVICES 136 345 #define DLT_JUNIPER_ATM1 137 346 347 /* 348 * Reserved for Apple IP-over-IEEE-1394. 349 */ 350 #define DLT_APPLE_IP_OVER_IEEE1394 138 351 352 /* 353 * Reserved for DOCSIS. 354 */ 355 #define DLT_DOCSIS 143 356 357 /* 358 * Reserved for Linux IrDA. 359 */ 360 #define DLT_LINUX_IRDA 144 361 362 /* 363 * Reserved for IBM SP switch and IBM Next Federation switch. 364 */ 365 #define DLT_IBM_SP 145 366 #define DLT_IBM_SN 146 367 368 /* 369 * Reserved for AbsoluteValue Systems 802.11 capture. 370 */ 371 #define DLT_IEEE802_11_RADIO_AVS 163 372 373 /* 374 * Reserved for Juniper-private DLT. 375 */ 376 #define DLT_JUNIPER_MONITOR 164 377 378 /* 379 * The instruction encodings. 380 */ 381 /* instruction classes */ 382 #define BPF_CLASS(code) ((code) & 0x07) 383 #define BPF_LD 0x00 384 #define BPF_LDX 0x01 385 #define BPF_ST 0x02 386 #define BPF_STX 0x03 387 #define BPF_ALU 0x04 388 #define BPF_JMP 0x05 389 #define BPF_RET 0x06 390 #define BPF_MISC 0x07 391 392 /* ld/ldx fields */ 393 #define BPF_SIZE(code) ((code) & 0x18) 394 #define BPF_W 0x00 395 #define BPF_H 0x08 396 #define BPF_B 0x10 397 #define BPF_MODE(code) ((code) & 0xe0) 398 #define BPF_IMM 0x00 399 #define BPF_ABS 0x20 400 #define BPF_IND 0x40 401 #define BPF_MEM 0x60 402 #define BPF_LEN 0x80 403 #define BPF_MSH 0xa0 404 405 /* alu/jmp fields */ 406 #define BPF_OP(code) ((code) & 0xf0) 407 #define BPF_ADD 0x00 408 #define BPF_SUB 0x10 409 #define BPF_MUL 0x20 410 #define BPF_DIV 0x30 411 #define BPF_OR 0x40 412 #define BPF_AND 0x50 413 #define BPF_LSH 0x60 414 #define BPF_RSH 0x70 415 #define BPF_NEG 0x80 416 #define BPF_JA 0x00 417 #define BPF_JEQ 0x10 418 #define BPF_JGT 0x20 419 #define BPF_JGE 0x30 420 #define BPF_JSET 0x40 421 #define BPF_SRC(code) ((code) & 0x08) 422 #define BPF_K 0x00 423 #define BPF_X 0x08 424 425 /* ret - BPF_K and BPF_X also apply */ 426 #define BPF_RVAL(code) ((code) & 0x18) 427 #define BPF_A 0x10 428 429 /* misc */ 430 #define BPF_MISCOP(code) ((code) & 0xf8) 431 #define BPF_TAX 0x00 432 #define BPF_TXA 0x80 433 434 /* 435 * The instruction data structure. 436 */ 437 struct bpf_insn { 438 u_short code; 439 u_char jt; 440 u_char jf; 441 bpf_u_int32 k; 442 }; 443 444 /* 445 * Macros for insn array initializers. 446 */ 447 #define BPF_STMT(code, k) { (u_short)(code), 0, 0, k } 448 #define BPF_JUMP(code, k, jt, jf) { (u_short)(code), jt, jf, k } 449 450 /* 451 * Structure to retrieve available DLTs for the interface. 452 */ 453 struct bpf_dltlist { 454 u_int bfl_len; /* number of bfd_list array */ 455 u_int *bfl_list; /* array of DLTs */ 456 }; 457 458 #ifdef _KERNEL 459 struct bpf_if; 460 int bpf_validate(const struct bpf_insn *, int); 461 void bpf_tap(struct bpf_if *, u_char *, u_int); 462 void bpf_mtap(struct bpf_if *, struct mbuf *); 463 void bpf_mtap2(struct bpf_if *, void *, u_int, struct mbuf *); 464 void bpfattach(struct ifnet *, u_int, u_int); 465 void bpfattach2(struct ifnet *, u_int, u_int, struct bpf_if **); 466 void bpfdetach(struct ifnet *); 467 468 void bpfilterattach(int); 469 u_int bpf_filter(const struct bpf_insn *, u_char *, u_int, u_int); 470 471 #define BPF_TAP(_ifp,_pkt,_pktlen) do { \ 472 if ((_ifp)->if_bpf) \ 473 bpf_tap((_ifp)->if_bpf, (_pkt), (_pktlen)); \ 474 } while (0) 475 #define BPF_MTAP(_ifp,_m) do { \ 476 if ((_ifp)->if_bpf) { \ 477 M_ASSERTVALID(_m); \ 478 bpf_mtap((_ifp)->if_bpf, (_m)); \ 479 } \ 480 } while (0) 481 #define BPF_MTAP2(_ifp,_data,_dlen,_m) do { \ 482 if ((_ifp)->if_bpf) { \ 483 M_ASSERTVALID(_m); \ 484 bpf_mtap2((_ifp)->if_bpf,(_data),(_dlen),(_m)); \ 485 } \ 486 } while (0) 487 #endif 488 489 /* 490 * Number of scratch memory words (for BPF_LD|BPF_MEM and BPF_ST). 491 */ 492 #define BPF_MEMWORDS 16 493 494 #endif /* _NET_BPF_H_ */ 495