bpf.h revision 159595
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: head/sys/net/bpf.h 159595 2006-06-14 02:23:28Z csjp $ 38 */ 39 40#ifndef _NET_BPF_H_ 41#define _NET_BPF_H_ 42 43/* BSD style release date */ 44#define BPF_RELEASE 199606 45 46typedef int32_t bpf_int32; 47typedef 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 */ 63struct bpf_program { 64 u_int bf_len; 65 struct bpf_insn *bf_insns; 66}; 67 68/* 69 * Struct returned by BIOCGSTATS. 70 */ 71struct 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 */ 87struct 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#define BIOCLOCK _IO('B', 122) 117#define BIOCSETWF _IOW('B',123, struct bpf_program) 118 119/* 120 * Structure prepended to each packet. 121 */ 122struct bpf_hdr { 123 struct timeval bh_tstamp; /* time stamp */ 124 bpf_u_int32 bh_caplen; /* length of captured portion */ 125 bpf_u_int32 bh_datalen; /* original length of packet */ 126 u_short bh_hdrlen; /* length of bpf header (this struct 127 plus alignment padding) */ 128}; 129/* 130 * Because the structure above is not a multiple of 4 bytes, some compilers 131 * will insist on inserting padding; hence, sizeof(struct bpf_hdr) won't work. 132 * Only the kernel needs to know about it; applications use bh_hdrlen. 133 */ 134#ifdef _KERNEL 135#define SIZEOF_BPF_HDR (sizeof(struct bpf_hdr) <= 20 ? 18 : \ 136 sizeof(struct bpf_hdr)) 137#endif 138 139/* 140 * Data-link level type codes. 141 */ 142#define DLT_NULL 0 /* BSD loopback encapsulation */ 143#define DLT_EN10MB 1 /* Ethernet (10Mb) */ 144#define DLT_EN3MB 2 /* Experimental Ethernet (3Mb) */ 145#define DLT_AX25 3 /* Amateur Radio AX.25 */ 146#define DLT_PRONET 4 /* Proteon ProNET Token Ring */ 147#define DLT_CHAOS 5 /* Chaos */ 148#define DLT_IEEE802 6 /* IEEE 802 Networks */ 149#define DLT_ARCNET 7 /* ARCNET */ 150#define DLT_SLIP 8 /* Serial Line IP */ 151#define DLT_PPP 9 /* Point-to-point Protocol */ 152#define DLT_FDDI 10 /* FDDI */ 153#define DLT_ATM_RFC1483 11 /* LLC/SNAP encapsulated atm */ 154#define DLT_RAW 12 /* raw IP */ 155 156/* 157 * These are values from BSD/OS's "bpf.h". 158 * These are not the same as the values from the traditional libpcap 159 * "bpf.h"; however, these values shouldn't be generated by any 160 * OS other than BSD/OS, so the correct values to use here are the 161 * BSD/OS values. 162 * 163 * Platforms that have already assigned these values to other 164 * DLT_ codes, however, should give these codes the values 165 * from that platform, so that programs that use these codes will 166 * continue to compile - even though they won't correctly read 167 * files of these types. 168 */ 169#define DLT_SLIP_BSDOS 15 /* BSD/OS Serial Line IP */ 170#define DLT_PPP_BSDOS 16 /* BSD/OS Point-to-point Protocol */ 171 172#define DLT_ATM_CLIP 19 /* Linux Classical-IP over ATM */ 173 174/* 175 * These values are defined by NetBSD; other platforms should refrain from 176 * using them for other purposes, so that NetBSD savefiles with link 177 * types of 50 or 51 can be read as this type on all platforms. 178 */ 179#define DLT_PPP_SERIAL 50 /* PPP over serial with HDLC encapsulation */ 180#define DLT_PPP_ETHER 51 /* PPP over Ethernet */ 181 182/* 183 * Reserved for the Symantec Enterprise Firewall. 184 */ 185#define DLT_SYMANTEC_FIREWALL 99 186 187 188/* 189 * This value was defined by libpcap 0.5; platforms that have defined 190 * it with a different value should define it here with that value - 191 * a link type of 104 in a save file will be mapped to DLT_C_HDLC, 192 * whatever value that happens to be, so programs will correctly 193 * handle files with that link type regardless of the value of 194 * DLT_C_HDLC. 195 * 196 * The name DLT_C_HDLC was used by BSD/OS; we use that name for source 197 * compatibility with programs written for BSD/OS. 198 * 199 * libpcap 0.5 defined it as DLT_CHDLC; we define DLT_CHDLC as well, 200 * for source compatibility with programs written for libpcap 0.5. 201 */ 202#define DLT_C_HDLC 104 /* Cisco HDLC */ 203#define DLT_CHDLC DLT_C_HDLC 204 205#define DLT_IEEE802_11 105 /* IEEE 802.11 wireless */ 206 207/* 208 * Values between 106 and 107 are used in capture file headers as 209 * link-layer types corresponding to DLT_ types that might differ 210 * between platforms; don't use those values for new DLT_ new types. 211 */ 212 213/* 214 * Frame Relay; BSD/OS has a DLT_FR with a value of 11, but that collides 215 * with other values. 216 * DLT_FR and DLT_FRELAY packets start with the Q.922 Frame Relay header 217 * (DLCI, etc.). 218 */ 219#define DLT_FRELAY 107 220 221/* 222 * OpenBSD DLT_LOOP, for loopback devices; it's like DLT_NULL, except 223 * that the AF_ type in the link-layer header is in network byte order. 224 * 225 * OpenBSD defines it as 12, but that collides with DLT_RAW, so we 226 * define it as 108 here. If OpenBSD picks up this file, it should 227 * define DLT_LOOP as 12 in its version, as per the comment above - 228 * and should not use 108 as a DLT_ value. 229 */ 230#define DLT_LOOP 108 231 232/* 233 * Values between 109 and 112 are used in capture file headers as 234 * link-layer types corresponding to DLT_ types that might differ 235 * between platforms; don't use those values for new DLT_ new types. 236 */ 237 238/* 239 * Encapsulated packets for IPsec; DLT_ENC is 13 in OpenBSD, but that's 240 * DLT_SLIP_BSDOS in NetBSD, so we don't use 13 for it in OSes other 241 * than OpenBSD. 242 */ 243#define DLT_ENC 109 244 245/* 246 * This is for Linux cooked sockets. 247 */ 248#define DLT_LINUX_SLL 113 249 250/* 251 * Apple LocalTalk hardware. 252 */ 253#define DLT_LTALK 114 254 255/* 256 * Acorn Econet. 257 */ 258#define DLT_ECONET 115 259 260/* 261 * Reserved for use with OpenBSD ipfilter. 262 */ 263#define DLT_IPFILTER 116 264 265/* 266 * Reserved for use in capture-file headers as a link-layer type 267 * corresponding to OpenBSD DLT_PFLOG; DLT_PFLOG is 17 in OpenBSD, 268 * but that's DLT_LANE8023 in SuSE 6.3, so we can't use 17 for it 269 * in capture-file headers. 270 */ 271#define DLT_PFLOG 117 272 273/* 274 * Registered for Cisco-internal use. 275 */ 276#define DLT_CISCO_IOS 118 277 278/* 279 * Reserved for 802.11 cards using the Prism II chips, with a link-layer 280 * header including Prism monitor mode information plus an 802.11 281 * header. 282 */ 283#define DLT_PRISM_HEADER 119 284 285/* 286 * Reserved for Aironet 802.11 cards, with an Aironet link-layer header 287 * (see Doug Ambrisko's FreeBSD patches). 288 */ 289#define DLT_AIRONET_HEADER 120 290 291/* 292 * Reserved for use by OpenBSD's pfsync device. 293 */ 294#define DLT_PFSYNC 121 295 296/* 297 * Reserved for Siemens HiPath HDLC. XXX 298 */ 299#define DLT_HHDLC 121 300 301/* 302 * Reserved for RFC 2625 IP-over-Fibre Channel. 303 */ 304#define DLT_IP_OVER_FC 122 305 306/* 307 * Reserved for Full Frontal ATM on Solaris. 308 */ 309#define DLT_SUNATM 123 310 311/* 312 * Reserved as per request from Kent Dahlgren <kent@praesum.com> 313 * for private use. 314 */ 315#define DLT_RIO 124 /* RapidIO */ 316#define DLT_PCI_EXP 125 /* PCI Express */ 317#define DLT_AURORA 126 /* Xilinx Aurora link layer */ 318 319/* 320 * BSD header for 802.11 plus a number of bits of link-layer information 321 * including radio information. 322 */ 323#ifndef DLT_IEEE802_11_RADIO 324#define DLT_IEEE802_11_RADIO 127 325#endif 326 327/* 328 * Reserved for TZSP encapsulation. 329 */ 330#define DLT_TZSP 128 /* Tazmen Sniffer Protocol */ 331 332/* 333 * Reserved for Linux ARCNET. 334 */ 335#define DLT_ARCNET_LINUX 129 336 337/* 338 * Juniper-private data link types. 339 */ 340#define DLT_JUNIPER_MLPPP 130 341#define DLT_JUNIPER_MLFR 131 342#define DLT_JUNIPER_ES 132 343#define DLT_JUNIPER_GGSN 133 344#define DLT_JUNIPER_MFR 134 345#define DLT_JUNIPER_ATM2 135 346#define DLT_JUNIPER_SERVICES 136 347#define DLT_JUNIPER_ATM1 137 348 349/* 350 * Apple IP-over-IEEE 1394, as per a request from Dieter Siegmund 351 * <dieter@apple.com>. The header that's presented is an Ethernet-like 352 * header: 353 * 354 * #define FIREWIRE_EUI64_LEN 8 355 * struct firewire_header { 356 * u_char firewire_dhost[FIREWIRE_EUI64_LEN]; 357 * u_char firewire_shost[FIREWIRE_EUI64_LEN]; 358 * u_short firewire_type; 359 * }; 360 * 361 * with "firewire_type" being an Ethernet type value, rather than, 362 * for example, raw GASP frames being handed up. 363 */ 364#define DLT_APPLE_IP_OVER_IEEE1394 138 365 366/* 367 * Various SS7 encapsulations, as per a request from Jeff Morriss 368 * <jeff.morriss[AT]ulticom.com> and subsequent discussions. 369 */ 370#define DLT_MTP2_WITH_PHDR 139 /* pseudo-header with various info, followed by MTP2 */ 371#define DLT_MTP2 140 /* MTP2, without pseudo-header */ 372#define DLT_MTP3 141 /* MTP3, without pseudo-header or MTP2 */ 373#define DLT_SCCP 142 /* SCCP, without pseudo-header or MTP2 or MTP3 */ 374 375/* 376 * Reserved for DOCSIS. 377 */ 378#define DLT_DOCSIS 143 379 380/* 381 * Reserved for Linux IrDA. 382 */ 383#define DLT_LINUX_IRDA 144 384 385/* 386 * Reserved for IBM SP switch and IBM Next Federation switch. 387 */ 388#define DLT_IBM_SP 145 389#define DLT_IBM_SN 146 390 391/* 392 * Reserved for private use. If you have some link-layer header type 393 * that you want to use within your organization, with the capture files 394 * using that link-layer header type not ever be sent outside your 395 * organization, you can use these values. 396 * 397 * No libpcap release will use these for any purpose, nor will any 398 * tcpdump release use them, either. 399 * 400 * Do *NOT* use these in capture files that you expect anybody not using 401 * your private versions of capture-file-reading tools to read; in 402 * particular, do *NOT* use them in products, otherwise you may find that 403 * people won't be able to use tcpdump, or snort, or Ethereal, or... to 404 * read capture files from your firewall/intrusion detection/traffic 405 * monitoring/etc. appliance, or whatever product uses that DLT_ value, 406 * and you may also find that the developers of those applications will 407 * not accept patches to let them read those files. 408 * 409 * Also, do not use them if somebody might send you a capture using them 410 * for *their* private type and tools using them for *your* private type 411 * would have to read them. 412 * 413 * Instead, ask "tcpdump-workers@tcpdump.org" for a new DLT_ value, 414 * as per the comment above, and use the type you're given. 415 */ 416#define DLT_USER0 147 417#define DLT_USER1 148 418#define DLT_USER2 149 419#define DLT_USER3 150 420#define DLT_USER4 151 421#define DLT_USER5 152 422#define DLT_USER6 153 423#define DLT_USER7 154 424#define DLT_USER8 155 425#define DLT_USER9 156 426#define DLT_USER10 157 427#define DLT_USER11 158 428#define DLT_USER12 159 429#define DLT_USER13 160 430#define DLT_USER14 161 431#define DLT_USER15 162 432 433/* 434 * For future use with 802.11 captures - defined by AbsoluteValue 435 * Systems to store a number of bits of link-layer information 436 * including radio information: 437 * 438 * http://www.shaftnet.org/~pizza/software/capturefrm.txt 439 * 440 * but it might be used by some non-AVS drivers now or in the 441 * future. 442 */ 443#define DLT_IEEE802_11_RADIO_AVS 163 /* 802.11 plus AVS radio header */ 444 445/* 446 * Juniper-private data link type, as per request from 447 * Hannes Gredler <hannes@juniper.net>. The DLT_s are used 448 * for passing on chassis-internal metainformation such as 449 * QOS profiles, etc.. 450 */ 451#define DLT_JUNIPER_MONITOR 164 452 453/* 454 * Reserved for BACnet MS/TP. 455 */ 456#define DLT_BACNET_MS_TP 165 457 458/* 459 * Another PPP variant as per request from Karsten Keil <kkeil@suse.de>. 460 * 461 * This is used in some OSes to allow a kernel socket filter to distinguish 462 * between incoming and outgoing packets, on a socket intended to 463 * supply pppd with outgoing packets so it can do dial-on-demand and 464 * hangup-on-lack-of-demand; incoming packets are filtered out so they 465 * don't cause pppd to hold the connection up (you don't want random 466 * input packets such as port scans, packets from old lost connections, 467 * etc. to force the connection to stay up). 468 * 469 * The first byte of the PPP header (0xff03) is modified to accomodate 470 * the direction - 0x00 = IN, 0x01 = OUT. 471 */ 472#define DLT_PPP_PPPD 166 473 474/* 475 * Names for backwards compatibility with older versions of some PPP 476 * software; new software should use DLT_PPP_PPPD. 477 */ 478#define DLT_PPP_WITH_DIRECTION DLT_PPP_PPPD 479#define DLT_LINUX_PPP_WITHDIRECTION DLT_PPP_PPPD 480 481/* 482 * Juniper-private data link type, as per request from 483 * Hannes Gredler <hannes@juniper.net>. The DLT_s are used 484 * for passing on chassis-internal metainformation such as 485 * QOS profiles, cookies, etc.. 486 */ 487#define DLT_JUNIPER_PPPOE 167 488#define DLT_JUNIPER_PPPOE_ATM 168 489 490#define DLT_GPRS_LLC 169 /* GPRS LLC */ 491#define DLT_GPF_T 170 /* GPF-T (ITU-T G.7041/Y.1303) */ 492#define DLT_GPF_F 171 /* GPF-F (ITU-T G.7041/Y.1303) */ 493 494/* 495 * Requested by Oolan Zimmer <oz@gcom.com> for use in Gcom's T1/E1 line 496 * monitoring equipment. 497 */ 498#define DLT_GCOM_T1E1 172 499#define DLT_GCOM_SERIAL 173 500 501/* 502 * Juniper-private data link type, as per request from 503 * Hannes Gredler <hannes@juniper.net>. The DLT_ is used 504 * for internal communication to Physical Interface Cards (PIC) 505 */ 506#define DLT_JUNIPER_PIC_PEER 174 507 508/* 509 * Link types requested by Gregor Maier <gregor@endace.com> of Endace 510 * Measurement Systems. They add an ERF header (see 511 * http://www.endace.com/support/EndaceRecordFormat.pdf) in front of 512 * the link-layer header. 513 */ 514#define DLT_ERF_ETH 175 /* Ethernet */ 515#define DLT_ERF_POS 176 /* Packet-over-SONET */ 516 517/* 518 * Requested by Daniele Orlandi <daniele@orlandi.com> for raw LAPD 519 * for vISDN (http://www.orlandi.com/visdn/). Its link-layer header 520 * includes additional information before the LAPD header, so it's 521 * not necessarily a generic LAPD header. 522 */ 523#define DLT_LINUX_LAPD 177 524 525/* 526 * The instruction encodings. 527 */ 528/* instruction classes */ 529#define BPF_CLASS(code) ((code) & 0x07) 530#define BPF_LD 0x00 531#define BPF_LDX 0x01 532#define BPF_ST 0x02 533#define BPF_STX 0x03 534#define BPF_ALU 0x04 535#define BPF_JMP 0x05 536#define BPF_RET 0x06 537#define BPF_MISC 0x07 538 539/* ld/ldx fields */ 540#define BPF_SIZE(code) ((code) & 0x18) 541#define BPF_W 0x00 542#define BPF_H 0x08 543#define BPF_B 0x10 544#define BPF_MODE(code) ((code) & 0xe0) 545#define BPF_IMM 0x00 546#define BPF_ABS 0x20 547#define BPF_IND 0x40 548#define BPF_MEM 0x60 549#define BPF_LEN 0x80 550#define BPF_MSH 0xa0 551 552/* alu/jmp fields */ 553#define BPF_OP(code) ((code) & 0xf0) 554#define BPF_ADD 0x00 555#define BPF_SUB 0x10 556#define BPF_MUL 0x20 557#define BPF_DIV 0x30 558#define BPF_OR 0x40 559#define BPF_AND 0x50 560#define BPF_LSH 0x60 561#define BPF_RSH 0x70 562#define BPF_NEG 0x80 563#define BPF_JA 0x00 564#define BPF_JEQ 0x10 565#define BPF_JGT 0x20 566#define BPF_JGE 0x30 567#define BPF_JSET 0x40 568#define BPF_SRC(code) ((code) & 0x08) 569#define BPF_K 0x00 570#define BPF_X 0x08 571 572/* ret - BPF_K and BPF_X also apply */ 573#define BPF_RVAL(code) ((code) & 0x18) 574#define BPF_A 0x10 575 576/* misc */ 577#define BPF_MISCOP(code) ((code) & 0xf8) 578#define BPF_TAX 0x00 579#define BPF_TXA 0x80 580 581/* 582 * The instruction data structure. 583 */ 584struct bpf_insn { 585 u_short code; 586 u_char jt; 587 u_char jf; 588 bpf_u_int32 k; 589}; 590 591/* 592 * Macros for insn array initializers. 593 */ 594#define BPF_STMT(code, k) { (u_short)(code), 0, 0, k } 595#define BPF_JUMP(code, k, jt, jf) { (u_short)(code), jt, jf, k } 596 597/* 598 * Structure to retrieve available DLTs for the interface. 599 */ 600struct bpf_dltlist { 601 u_int bfl_len; /* number of bfd_list array */ 602 u_int *bfl_list; /* array of DLTs */ 603}; 604 605#ifdef _KERNEL 606/* 607 * Descriptor associated with each attached hardware interface. 608 */ 609struct bpf_if { 610 LIST_ENTRY(bpf_if) bif_next; /* list of all interfaces */ 611 LIST_HEAD(, bpf_d) bif_dlist; /* descriptor list */ 612 u_int bif_dlt; /* link layer type */ 613 u_int bif_hdrlen; /* length of header (with padding) */ 614 struct ifnet *bif_ifp; /* corresponding interface */ 615 struct mtx bif_mtx; /* mutex for interface */ 616}; 617 618int bpf_validate(const struct bpf_insn *, int); 619void bpf_tap(struct bpf_if *, u_char *, u_int); 620void bpf_mtap(struct bpf_if *, struct mbuf *); 621void bpf_mtap2(struct bpf_if *, void *, u_int, struct mbuf *); 622void bpfattach(struct ifnet *, u_int, u_int); 623void bpfattach2(struct ifnet *, u_int, u_int, struct bpf_if **); 624void bpfdetach(struct ifnet *); 625 626void bpfilterattach(int); 627u_int bpf_filter(const struct bpf_insn *, u_char *, u_int, u_int); 628 629static __inline int 630bpf_peers_present(struct bpf_if *bpf) 631{ 632 633 if (!LIST_EMPTY(&bpf->bif_dlist)) 634 return (1); 635 return (0); 636} 637 638#define BPF_TAP(_ifp,_pkt,_pktlen) do { \ 639 if (bpf_peers_present((_ifp)->if_bpf)) \ 640 bpf_tap((_ifp)->if_bpf, (_pkt), (_pktlen)); \ 641} while (0) 642#define BPF_MTAP(_ifp,_m) do { \ 643 if (bpf_peers_present((_ifp)->if_bpf)) { \ 644 M_ASSERTVALID(_m); \ 645 bpf_mtap((_ifp)->if_bpf, (_m)); \ 646 } \ 647} while (0) 648#define BPF_MTAP2(_ifp,_data,_dlen,_m) do { \ 649 if (bpf_peers_present((_ifp)->if_bpf)) { \ 650 M_ASSERTVALID(_m); \ 651 bpf_mtap2((_ifp)->if_bpf,(_data),(_dlen),(_m)); \ 652 } \ 653} while (0) 654#endif 655 656/* 657 * Number of scratch memory words (for BPF_LD|BPF_MEM and BPF_ST). 658 */ 659#define BPF_MEMWORDS 16 660 661#endif /* _NET_BPF_H_ */ 662