FreeBSD/Linux Kernel Cross Reference
sys/net/bpf.h
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: releng/6.3/sys/net/bpf.h 173886 2007-11-24 19:45:58Z cvs2svn $
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 #define BIOCLOCK _IO('B', 122)
117 #define BIOCSETWF _IOW('B',123, struct bpf_program)
118
119 /*
120 * Structure prepended to each packet.
121 */
122 struct 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 * Juniper-private data link type, as per request from
527 * Hannes Gredler <hannes@juniper.net>.
528 * The DLT_ are used for prepending meta-information
529 * like interface index, interface name
530 * before standard Ethernet, PPP, Frelay & C-HDLC Frames
531 */
532 #define DLT_JUNIPER_ETHER 178
533 #define DLT_JUNIPER_PPP 179
534 #define DLT_JUNIPER_FRELAY 180
535 #define DLT_JUNIPER_CHDLC 181
536
537 /*
538 * The instruction encodings.
539 */
540 /* instruction classes */
541 #define BPF_CLASS(code) ((code) & 0x07)
542 #define BPF_LD 0x00
543 #define BPF_LDX 0x01
544 #define BPF_ST 0x02
545 #define BPF_STX 0x03
546 #define BPF_ALU 0x04
547 #define BPF_JMP 0x05
548 #define BPF_RET 0x06
549 #define BPF_MISC 0x07
550
551 /* ld/ldx fields */
552 #define BPF_SIZE(code) ((code) & 0x18)
553 #define BPF_W 0x00
554 #define BPF_H 0x08
555 #define BPF_B 0x10
556 #define BPF_MODE(code) ((code) & 0xe0)
557 #define BPF_IMM 0x00
558 #define BPF_ABS 0x20
559 #define BPF_IND 0x40
560 #define BPF_MEM 0x60
561 #define BPF_LEN 0x80
562 #define BPF_MSH 0xa0
563
564 /* alu/jmp fields */
565 #define BPF_OP(code) ((code) & 0xf0)
566 #define BPF_ADD 0x00
567 #define BPF_SUB 0x10
568 #define BPF_MUL 0x20
569 #define BPF_DIV 0x30
570 #define BPF_OR 0x40
571 #define BPF_AND 0x50
572 #define BPF_LSH 0x60
573 #define BPF_RSH 0x70
574 #define BPF_NEG 0x80
575 #define BPF_JA 0x00
576 #define BPF_JEQ 0x10
577 #define BPF_JGT 0x20
578 #define BPF_JGE 0x30
579 #define BPF_JSET 0x40
580 #define BPF_SRC(code) ((code) & 0x08)
581 #define BPF_K 0x00
582 #define BPF_X 0x08
583
584 /* ret - BPF_K and BPF_X also apply */
585 #define BPF_RVAL(code) ((code) & 0x18)
586 #define BPF_A 0x10
587
588 /* misc */
589 #define BPF_MISCOP(code) ((code) & 0xf8)
590 #define BPF_TAX 0x00
591 #define BPF_TXA 0x80
592
593 /*
594 * The instruction data structure.
595 */
596 struct bpf_insn {
597 u_short code;
598 u_char jt;
599 u_char jf;
600 bpf_u_int32 k;
601 };
602
603 /*
604 * Macros for insn array initializers.
605 */
606 #define BPF_STMT(code, k) { (u_short)(code), 0, 0, k }
607 #define BPF_JUMP(code, k, jt, jf) { (u_short)(code), jt, jf, k }
608
609 /*
610 * Structure to retrieve available DLTs for the interface.
611 */
612 struct bpf_dltlist {
613 u_int bfl_len; /* number of bfd_list array */
614 u_int *bfl_list; /* array of DLTs */
615 };
616
617 #ifdef _KERNEL
618 /*
619 * Descriptor associated with each attached hardware interface.
620 */
621 struct bpf_if {
622 LIST_ENTRY(bpf_if) bif_next; /* list of all interfaces */
623 LIST_HEAD(, bpf_d) bif_dlist; /* descriptor list */
624 u_int bif_dlt; /* link layer type */
625 u_int bif_hdrlen; /* length of header (with padding) */
626 struct ifnet *bif_ifp; /* corresponding interface */
627 struct mtx bif_mtx; /* mutex for interface */
628 };
629
630 /* ABI compatibility hacks. */
631 #define bpf_tap bpf_tap_new
632 #define bpf_mtap bpf_mtap_new
633 #define bpf_mtap2 bpf_mtap2_new
634
635 int bpf_validate(const struct bpf_insn *, int);
636 void bpf_tap(struct bpf_if *, u_char *, u_int);
637 void bpf_mtap(struct bpf_if *, struct mbuf *);
638 void bpf_mtap2(struct bpf_if *, void *, u_int, struct mbuf *);
639 void bpfattach(struct ifnet *, u_int, u_int);
640 void bpfattach2(struct ifnet *, u_int, u_int, struct bpf_if **);
641 void bpfdetach(struct ifnet *);
642
643 void bpfilterattach(int);
644 u_int bpf_filter(const struct bpf_insn *, u_char *, u_int, u_int);
645
646 static __inline int
647 bpf_peers_present(struct bpf_if *bpf)
648 {
649
650 if (!LIST_EMPTY(&bpf->bif_dlist))
651 return (1);
652 return (0);
653 }
654
655 #define BPF_TAP(_ifp,_pkt,_pktlen) do { \
656 if (bpf_peers_present((_ifp)->if_bpf)) \
657 bpf_tap((_ifp)->if_bpf, (_pkt), (_pktlen)); \
658 } while (0)
659 #define BPF_MTAP(_ifp,_m) do { \
660 if (bpf_peers_present((_ifp)->if_bpf)) { \
661 M_ASSERTVALID(_m); \
662 bpf_mtap((_ifp)->if_bpf, (_m)); \
663 } \
664 } while (0)
665 #define BPF_MTAP2(_ifp,_data,_dlen,_m) do { \
666 if (bpf_peers_present((_ifp)->if_bpf)) { \
667 M_ASSERTVALID(_m); \
668 bpf_mtap2((_ifp)->if_bpf,(_data),(_dlen),(_m)); \
669 } \
670 } while (0)
671 #endif
672
673 /*
674 * Number of scratch memory words (for BPF_LD|BPF_MEM and BPF_ST).
675 */
676 #define BPF_MEMWORDS 16
677
678 #endif /* _NET_BPF_H_ */
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