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 BIOCGDIRECTION _IOR('B',118, u_int) 113 #define BIOCSDIRECTION _IOW('B',119, u_int) 114 #define BIOCSDLT _IOW('B',120, u_int) 115 #define BIOCGDLTLIST _IOWR('B',121, struct bpf_dltlist) 116 #define BIOCLOCK _IO('B', 122) 117 #define BIOCSETWF _IOW('B',123, struct bpf_program) 118 #define BIOCFEEDBACK _IOW('B',124, u_int) 119 120 /* Obsolete */ 121 #define BIOCGSEESENT BIOCGDIRECTION 122 #define BIOCSSEESENT BIOCSDIRECTION 123 124 /* Packet directions */ 125 enum bpf_direction { 126 BPF_D_IN, /* See incoming packets */ 127 BPF_D_INOUT, /* See incoming and outgoing packets */ 128 BPF_D_OUT /* See outgoing packets */ 129 }; 130 131 /* 132 * Structure prepended to each packet. 133 */ 134 struct bpf_hdr { 135 struct timeval bh_tstamp; /* time stamp */ 136 bpf_u_int32 bh_caplen; /* length of captured portion */ 137 bpf_u_int32 bh_datalen; /* original length of packet */ 138 u_short bh_hdrlen; /* length of bpf header (this struct 139 plus alignment padding) */ 140 }; 141 /* 142 * Because the structure above is not a multiple of 4 bytes, some compilers 143 * will insist on inserting padding; hence, sizeof(struct bpf_hdr) won't work. 144 * Only the kernel needs to know about it; applications use bh_hdrlen. 145 */ 146 #ifdef _KERNEL 147 #define SIZEOF_BPF_HDR (sizeof(struct bpf_hdr) <= 20 ? 18 : \ 148 sizeof(struct bpf_hdr)) 149 #endif 150 151 /* 152 * Data-link level type codes. 153 */ 154 #define DLT_NULL 0 /* BSD loopback encapsulation */ 155 #define DLT_EN10MB 1 /* Ethernet (10Mb) */ 156 #define DLT_EN3MB 2 /* Experimental Ethernet (3Mb) */ 157 #define DLT_AX25 3 /* Amateur Radio AX.25 */ 158 #define DLT_PRONET 4 /* Proteon ProNET Token Ring */ 159 #define DLT_CHAOS 5 /* Chaos */ 160 #define DLT_IEEE802 6 /* IEEE 802 Networks */ 161 #define DLT_ARCNET 7 /* ARCNET */ 162 #define DLT_SLIP 8 /* Serial Line IP */ 163 #define DLT_PPP 9 /* Point-to-point Protocol */ 164 #define DLT_FDDI 10 /* FDDI */ 165 #define DLT_ATM_RFC1483 11 /* LLC/SNAP encapsulated atm */ 166 #define DLT_RAW 12 /* raw IP */ 167 168 /* 169 * These are values from BSD/OS's "bpf.h". 170 * These are not the same as the values from the traditional libpcap 171 * "bpf.h"; however, these values shouldn't be generated by any 172 * OS other than BSD/OS, so the correct values to use here are the 173 * BSD/OS values. 174 * 175 * Platforms that have already assigned these values to other 176 * DLT_ codes, however, should give these codes the values 177 * from that platform, so that programs that use these codes will 178 * continue to compile - even though they won't correctly read 179 * files of these types. 180 */ 181 #define DLT_SLIP_BSDOS 15 /* BSD/OS Serial Line IP */ 182 #define DLT_PPP_BSDOS 16 /* BSD/OS Point-to-point Protocol */ 183 184 #define DLT_ATM_CLIP 19 /* Linux Classical-IP over ATM */ 185 186 /* 187 * These values are defined by NetBSD; other platforms should refrain from 188 * using them for other purposes, so that NetBSD savefiles with link 189 * types of 50 or 51 can be read as this type on all platforms. 190 */ 191 #define DLT_PPP_SERIAL 50 /* PPP over serial with HDLC encapsulation */ 192 #define DLT_PPP_ETHER 51 /* PPP over Ethernet */ 193 194 /* 195 * Reserved for the Symantec Enterprise Firewall. 196 */ 197 #define DLT_SYMANTEC_FIREWALL 99 198 199 200 /* 201 * This value was defined by libpcap 0.5; platforms that have defined 202 * it with a different value should define it here with that value - 203 * a link type of 104 in a save file will be mapped to DLT_C_HDLC, 204 * whatever value that happens to be, so programs will correctly 205 * handle files with that link type regardless of the value of 206 * DLT_C_HDLC. 207 * 208 * The name DLT_C_HDLC was used by BSD/OS; we use that name for source 209 * compatibility with programs written for BSD/OS. 210 * 211 * libpcap 0.5 defined it as DLT_CHDLC; we define DLT_CHDLC as well, 212 * for source compatibility with programs written for libpcap 0.5. 213 */ 214 #define DLT_C_HDLC 104 /* Cisco HDLC */ 215 #define DLT_CHDLC DLT_C_HDLC 216 217 #define DLT_IEEE802_11 105 /* IEEE 802.11 wireless */ 218 219 /* 220 * Values between 106 and 107 are used in capture file headers as 221 * link-layer types corresponding to DLT_ types that might differ 222 * between platforms; don't use those values for new DLT_ new types. 223 */ 224 225 /* 226 * Frame Relay; BSD/OS has a DLT_FR with a value of 11, but that collides 227 * with other values. 228 * DLT_FR and DLT_FRELAY packets start with the Q.922 Frame Relay header 229 * (DLCI, etc.). 230 */ 231 #define DLT_FRELAY 107 232 233 /* 234 * OpenBSD DLT_LOOP, for loopback devices; it's like DLT_NULL, except 235 * that the AF_ type in the link-layer header is in network byte order. 236 * 237 * OpenBSD defines it as 12, but that collides with DLT_RAW, so we 238 * define it as 108 here. If OpenBSD picks up this file, it should 239 * define DLT_LOOP as 12 in its version, as per the comment above - 240 * and should not use 108 as a DLT_ value. 241 */ 242 #define DLT_LOOP 108 243 244 /* 245 * Values between 109 and 112 are used in capture file headers as 246 * link-layer types corresponding to DLT_ types that might differ 247 * between platforms; don't use those values for new DLT_ new types. 248 */ 249 250 /* 251 * Encapsulated packets for IPsec; DLT_ENC is 13 in OpenBSD, but that's 252 * DLT_SLIP_BSDOS in NetBSD, so we don't use 13 for it in OSes other 253 * than OpenBSD. 254 */ 255 #define DLT_ENC 109 256 257 /* 258 * This is for Linux cooked sockets. 259 */ 260 #define DLT_LINUX_SLL 113 261 262 /* 263 * Apple LocalTalk hardware. 264 */ 265 #define DLT_LTALK 114 266 267 /* 268 * Acorn Econet. 269 */ 270 #define DLT_ECONET 115 271 272 /* 273 * Reserved for use with OpenBSD ipfilter. 274 */ 275 #define DLT_IPFILTER 116 276 277 /* 278 * Reserved for use in capture-file headers as a link-layer type 279 * corresponding to OpenBSD DLT_PFLOG; DLT_PFLOG is 17 in OpenBSD, 280 * but that's DLT_LANE8023 in SuSE 6.3, so we can't use 17 for it 281 * in capture-file headers. 282 */ 283 #define DLT_PFLOG 117 284 285 /* 286 * Registered for Cisco-internal use. 287 */ 288 #define DLT_CISCO_IOS 118 289 290 /* 291 * Reserved for 802.11 cards using the Prism II chips, with a link-layer 292 * header including Prism monitor mode information plus an 802.11 293 * header. 294 */ 295 #define DLT_PRISM_HEADER 119 296 297 /* 298 * Reserved for Aironet 802.11 cards, with an Aironet link-layer header 299 * (see Doug Ambrisko's FreeBSD patches). 300 */ 301 #define DLT_AIRONET_HEADER 120 302 303 /* 304 * Reserved for use by OpenBSD's pfsync device. 305 */ 306 #define DLT_PFSYNC 121 307 308 /* 309 * Reserved for Siemens HiPath HDLC. XXX 310 */ 311 #define DLT_HHDLC 121 312 313 /* 314 * Reserved for RFC 2625 IP-over-Fibre Channel. 315 */ 316 #define DLT_IP_OVER_FC 122 317 318 /* 319 * Reserved for Full Frontal ATM on Solaris. 320 */ 321 #define DLT_SUNATM 123 322 323 /* 324 * Reserved as per request from Kent Dahlgren <kent@praesum.com> 325 * for private use. 326 */ 327 #define DLT_RIO 124 /* RapidIO */ 328 #define DLT_PCI_EXP 125 /* PCI Express */ 329 #define DLT_AURORA 126 /* Xilinx Aurora link layer */ 330 331 /* 332 * BSD header for 802.11 plus a number of bits of link-layer information 333 * including radio information. 334 */ 335 #ifndef DLT_IEEE802_11_RADIO 336 #define DLT_IEEE802_11_RADIO 127 337 #endif 338 339 /* 340 * Reserved for TZSP encapsulation. 341 */ 342 #define DLT_TZSP 128 /* Tazmen Sniffer Protocol */ 343 344 /* 345 * Reserved for Linux ARCNET. 346 */ 347 #define DLT_ARCNET_LINUX 129 348 349 /* 350 * Juniper-private data link types. 351 */ 352 #define DLT_JUNIPER_MLPPP 130 353 #define DLT_JUNIPER_MLFR 131 354 #define DLT_JUNIPER_ES 132 355 #define DLT_JUNIPER_GGSN 133 356 #define DLT_JUNIPER_MFR 134 357 #define DLT_JUNIPER_ATM2 135 358 #define DLT_JUNIPER_SERVICES 136 359 #define DLT_JUNIPER_ATM1 137 360 361 /* 362 * Apple IP-over-IEEE 1394, as per a request from Dieter Siegmund 363 * <dieter@apple.com>. The header that's presented is an Ethernet-like 364 * header: 365 * 366 * #define FIREWIRE_EUI64_LEN 8 367 * struct firewire_header { 368 * u_char firewire_dhost[FIREWIRE_EUI64_LEN]; 369 * u_char firewire_shost[FIREWIRE_EUI64_LEN]; 370 * u_short firewire_type; 371 * }; 372 * 373 * with "firewire_type" being an Ethernet type value, rather than, 374 * for example, raw GASP frames being handed up. 375 */ 376 #define DLT_APPLE_IP_OVER_IEEE1394 138 377 378 /* 379 * Various SS7 encapsulations, as per a request from Jeff Morriss 380 * <jeff.morriss[AT]ulticom.com> and subsequent discussions. 381 */ 382 #define DLT_MTP2_WITH_PHDR 139 /* pseudo-header with various info, followed by MTP2 */ 383 #define DLT_MTP2 140 /* MTP2, without pseudo-header */ 384 #define DLT_MTP3 141 /* MTP3, without pseudo-header or MTP2 */ 385 #define DLT_SCCP 142 /* SCCP, without pseudo-header or MTP2 or MTP3 */ 386 387 /* 388 * Reserved for DOCSIS. 389 */ 390 #define DLT_DOCSIS 143 391 392 /* 393 * Reserved for Linux IrDA. 394 */ 395 #define DLT_LINUX_IRDA 144 396 397 /* 398 * Reserved for IBM SP switch and IBM Next Federation switch. 399 */ 400 #define DLT_IBM_SP 145 401 #define DLT_IBM_SN 146 402 403 /* 404 * Reserved for private use. If you have some link-layer header type 405 * that you want to use within your organization, with the capture files 406 * using that link-layer header type not ever be sent outside your 407 * organization, you can use these values. 408 * 409 * No libpcap release will use these for any purpose, nor will any 410 * tcpdump release use them, either. 411 * 412 * Do *NOT* use these in capture files that you expect anybody not using 413 * your private versions of capture-file-reading tools to read; in 414 * particular, do *NOT* use them in products, otherwise you may find that 415 * people won't be able to use tcpdump, or snort, or Ethereal, or... to 416 * read capture files from your firewall/intrusion detection/traffic 417 * monitoring/etc. appliance, or whatever product uses that DLT_ value, 418 * and you may also find that the developers of those applications will 419 * not accept patches to let them read those files. 420 * 421 * Also, do not use them if somebody might send you a capture using them 422 * for *their* private type and tools using them for *your* private type 423 * would have to read them. 424 * 425 * Instead, ask "tcpdump-workers@tcpdump.org" for a new DLT_ value, 426 * as per the comment above, and use the type you're given. 427 */ 428 #define DLT_USER0 147 429 #define DLT_USER1 148 430 #define DLT_USER2 149 431 #define DLT_USER3 150 432 #define DLT_USER4 151 433 #define DLT_USER5 152 434 #define DLT_USER6 153 435 #define DLT_USER7 154 436 #define DLT_USER8 155 437 #define DLT_USER9 156 438 #define DLT_USER10 157 439 #define DLT_USER11 158 440 #define DLT_USER12 159 441 #define DLT_USER13 160 442 #define DLT_USER14 161 443 #define DLT_USER15 162 444 445 /* 446 * For future use with 802.11 captures - defined by AbsoluteValue 447 * Systems to store a number of bits of link-layer information 448 * including radio information: 449 * 450 * http://www.shaftnet.org/~pizza/software/capturefrm.txt 451 * 452 * but it might be used by some non-AVS drivers now or in the 453 * future. 454 */ 455 #define DLT_IEEE802_11_RADIO_AVS 163 /* 802.11 plus AVS radio header */ 456 457 /* 458 * Juniper-private data link type, as per request from 459 * Hannes Gredler <hannes@juniper.net>. The DLT_s are used 460 * for passing on chassis-internal metainformation such as 461 * QOS profiles, etc.. 462 */ 463 #define DLT_JUNIPER_MONITOR 164 464 465 /* 466 * Reserved for BACnet MS/TP. 467 */ 468 #define DLT_BACNET_MS_TP 165 469 470 /* 471 * Another PPP variant as per request from Karsten Keil <kkeil@suse.de>. 472 * 473 * This is used in some OSes to allow a kernel socket filter to distinguish 474 * between incoming and outgoing packets, on a socket intended to 475 * supply pppd with outgoing packets so it can do dial-on-demand and 476 * hangup-on-lack-of-demand; incoming packets are filtered out so they 477 * don't cause pppd to hold the connection up (you don't want random 478 * input packets such as port scans, packets from old lost connections, 479 * etc. to force the connection to stay up). 480 * 481 * The first byte of the PPP header (0xff03) is modified to accomodate 482 * the direction - 0x00 = IN, 0x01 = OUT. 483 */ 484 #define DLT_PPP_PPPD 166 485 486 /* 487 * Names for backwards compatibility with older versions of some PPP 488 * software; new software should use DLT_PPP_PPPD. 489 */ 490 #define DLT_PPP_WITH_DIRECTION DLT_PPP_PPPD 491 #define DLT_LINUX_PPP_WITHDIRECTION DLT_PPP_PPPD 492 493 /* 494 * Juniper-private data link type, as per request from 495 * Hannes Gredler <hannes@juniper.net>. The DLT_s are used 496 * for passing on chassis-internal metainformation such as 497 * QOS profiles, cookies, etc.. 498 */ 499 #define DLT_JUNIPER_PPPOE 167 500 #define DLT_JUNIPER_PPPOE_ATM 168 501 502 #define DLT_GPRS_LLC 169 /* GPRS LLC */ 503 #define DLT_GPF_T 170 /* GPF-T (ITU-T G.7041/Y.1303) */ 504 #define DLT_GPF_F 171 /* GPF-F (ITU-T G.7041/Y.1303) */ 505 506 /* 507 * Requested by Oolan Zimmer <oz@gcom.com> for use in Gcom's T1/E1 line 508 * monitoring equipment. 509 */ 510 #define DLT_GCOM_T1E1 172 511 #define DLT_GCOM_SERIAL 173 512 513 /* 514 * Juniper-private data link type, as per request from 515 * Hannes Gredler <hannes@juniper.net>. The DLT_ is used 516 * for internal communication to Physical Interface Cards (PIC) 517 */ 518 #define DLT_JUNIPER_PIC_PEER 174 519 520 /* 521 * Link types requested by Gregor Maier <gregor@endace.com> of Endace 522 * Measurement Systems. They add an ERF header (see 523 * http://www.endace.com/support/EndaceRecordFormat.pdf) in front of 524 * the link-layer header. 525 */ 526 #define DLT_ERF_ETH 175 /* Ethernet */ 527 #define DLT_ERF_POS 176 /* Packet-over-SONET */ 528 529 /* 530 * Requested by Daniele Orlandi <daniele@orlandi.com> for raw LAPD 531 * for vISDN (http://www.orlandi.com/visdn/). Its link-layer header 532 * includes additional information before the LAPD header, so it's 533 * not necessarily a generic LAPD header. 534 */ 535 #define DLT_LINUX_LAPD 177 536 537 /* 538 * Juniper-private data link type, as per request from 539 * Hannes Gredler <hannes@juniper.net>. 540 * The DLT_ are used for prepending meta-information 541 * like interface index, interface name 542 * before standard Ethernet, PPP, Frelay & C-HDLC Frames 543 */ 544 #define DLT_JUNIPER_ETHER 178 545 #define DLT_JUNIPER_PPP 179 546 #define DLT_JUNIPER_FRELAY 180 547 #define DLT_JUNIPER_CHDLC 181 548 549 /* 550 * The instruction encodings. 551 */ 552 /* instruction classes */ 553 #define BPF_CLASS(code) ((code) & 0x07) 554 #define BPF_LD 0x00 555 #define BPF_LDX 0x01 556 #define BPF_ST 0x02 557 #define BPF_STX 0x03 558 #define BPF_ALU 0x04 559 #define BPF_JMP 0x05 560 #define BPF_RET 0x06 561 #define BPF_MISC 0x07 562 563 /* ld/ldx fields */ 564 #define BPF_SIZE(code) ((code) & 0x18) 565 #define BPF_W 0x00 566 #define BPF_H 0x08 567 #define BPF_B 0x10 568 #define BPF_MODE(code) ((code) & 0xe0) 569 #define BPF_IMM 0x00 570 #define BPF_ABS 0x20 571 #define BPF_IND 0x40 572 #define BPF_MEM 0x60 573 #define BPF_LEN 0x80 574 #define BPF_MSH 0xa0 575 576 /* alu/jmp fields */ 577 #define BPF_OP(code) ((code) & 0xf0) 578 #define BPF_ADD 0x00 579 #define BPF_SUB 0x10 580 #define BPF_MUL 0x20 581 #define BPF_DIV 0x30 582 #define BPF_OR 0x40 583 #define BPF_AND 0x50 584 #define BPF_LSH 0x60 585 #define BPF_RSH 0x70 586 #define BPF_NEG 0x80 587 #define BPF_JA 0x00 588 #define BPF_JEQ 0x10 589 #define BPF_JGT 0x20 590 #define BPF_JGE 0x30 591 #define BPF_JSET 0x40 592 #define BPF_SRC(code) ((code) & 0x08) 593 #define BPF_K 0x00 594 #define BPF_X 0x08 595 596 /* ret - BPF_K and BPF_X also apply */ 597 #define BPF_RVAL(code) ((code) & 0x18) 598 #define BPF_A 0x10 599 600 /* misc */ 601 #define BPF_MISCOP(code) ((code) & 0xf8) 602 #define BPF_TAX 0x00 603 #define BPF_TXA 0x80 604 605 /* 606 * The instruction data structure. 607 */ 608 struct bpf_insn { 609 u_short code; 610 u_char jt; 611 u_char jf; 612 bpf_u_int32 k; 613 }; 614 615 /* 616 * Macros for insn array initializers. 617 */ 618 #define BPF_STMT(code, k) { (u_short)(code), 0, 0, k } 619 #define BPF_JUMP(code, k, jt, jf) { (u_short)(code), jt, jf, k } 620 621 /* 622 * Structure to retrieve available DLTs for the interface. 623 */ 624 struct bpf_dltlist { 625 u_int bfl_len; /* number of bfd_list array */ 626 u_int *bfl_list; /* array of DLTs */ 627 }; 628 629 #ifdef _KERNEL 630 /* 631 * Descriptor associated with each attached hardware interface. 632 */ 633 struct bpf_if { 634 LIST_ENTRY(bpf_if) bif_next; /* list of all interfaces */ 635 LIST_HEAD(, bpf_d) bif_dlist; /* descriptor list */ 636 u_int bif_dlt; /* link layer type */ 637 u_int bif_hdrlen; /* length of header (with padding) */ 638 struct ifnet *bif_ifp; /* corresponding interface */ 639 struct mtx bif_mtx; /* mutex for interface */ 640 }; 641 642 int bpf_validate(const struct bpf_insn *, int); 643 void bpf_tap(struct bpf_if *, u_char *, u_int); 644 void bpf_mtap(struct bpf_if *, struct mbuf *); 645 void bpf_mtap2(struct bpf_if *, void *, u_int, struct mbuf *); 646 void bpfattach(struct ifnet *, u_int, u_int); 647 void bpfattach2(struct ifnet *, u_int, u_int, struct bpf_if **); 648 void bpfdetach(struct ifnet *); 649 650 void bpfilterattach(int); 651 u_int bpf_filter(const struct bpf_insn *, u_char *, u_int, u_int); 652 653 static __inline int 654 bpf_peers_present(struct bpf_if *bpf) 655 { 656 657 if (!LIST_EMPTY(&bpf->bif_dlist)) 658 return (1); 659 return (0); 660 } 661 662 #define BPF_TAP(_ifp,_pkt,_pktlen) do { \ 663 if (bpf_peers_present((_ifp)->if_bpf)) \ 664 bpf_tap((_ifp)->if_bpf, (_pkt), (_pktlen)); \ 665 } while (0) 666 #define BPF_MTAP(_ifp,_m) do { \ 667 if (bpf_peers_present((_ifp)->if_bpf)) { \ 668 M_ASSERTVALID(_m); \ 669 bpf_mtap((_ifp)->if_bpf, (_m)); \ 670 } \ 671 } while (0) 672 #define BPF_MTAP2(_ifp,_data,_dlen,_m) do { \ 673 if (bpf_peers_present((_ifp)->if_bpf)) { \ 674 M_ASSERTVALID(_m); \ 675 bpf_mtap2((_ifp)->if_bpf,(_data),(_dlen),(_m)); \ 676 } \ 677 } while (0) 678 #endif 679 680 /* 681 * Number of scratch memory words (for BPF_LD|BPF_MEM and BPF_ST). 682 */ 683 #define BPF_MEMWORDS 16 684 685 #endif /* _NET_BPF_H_ */ 686