2 * Copyright (c) 1990, 1991, 1993
3 * The Regents of the University of California. All rights reserved.
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
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
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.
26 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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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
38 * @(#)bpf.h 8.1 (Berkeley) 6/10/93
39 * @(#)bpf.h 1.34 (LBL) 6/16/96
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 1.6 2004/09/19 22:32:47 joerg Exp $
48 /* BSD style release date */
49 #define BPF_RELEASE 199606
51 typedef int32_t bpf_int32;
52 typedef u_int32_t bpf_u_int32;
55 * Alignment macros. BPF_WORDALIGN rounds up to the next
56 * even multiple of BPF_ALIGNMENT.
58 #define BPF_ALIGNMENT sizeof(long)
59 #define BPF_WORDALIGN(x) (((x)+(BPF_ALIGNMENT-1))&~(BPF_ALIGNMENT-1))
61 #define BPF_MAXINSNS 512
62 #define BPF_MAXBUFSIZE 0x80000
63 #define BPF_DEFAULTBUFSIZE 4096
64 #define BPF_MINBUFSIZE 32
67 * Structure for BIOCSETF.
71 struct bpf_insn *bf_insns;
75 * Struct returned by BIOCGSTATS.
78 u_int bs_recv; /* number of packets received */
79 u_int bs_drop; /* number of packets dropped */
83 * Struct return by BIOCVERSION. This represents the version number of
84 * the filter language described by the instruction encodings below.
85 * bpf understands a program iff kernel_major == filter_major &&
86 * kernel_minor >= filter_minor, that is, if the value returned by the
87 * running kernel has the same major number and a minor number equal
88 * equal to or less than the filter being downloaded. Otherwise, the
89 * results are undefined, meaning an error may be returned or packets
90 * may be accepted haphazardly.
91 * It has nothing to do with the source code version.
97 /* Current version number of filter architecture. */
98 #define BPF_MAJOR_VERSION 1
99 #define BPF_MINOR_VERSION 1
101 #define BIOCGBLEN _IOR('B',102, u_int)
102 #define BIOCSBLEN _IOWR('B',102, u_int)
103 #define BIOCSETF _IOW('B',103, struct bpf_program)
104 #define BIOCFLUSH _IO('B',104)
105 #define BIOCPROMISC _IO('B',105)
106 #define BIOCGDLT _IOR('B',106, u_int)
107 #define BIOCGETIF _IOR('B',107, struct ifreq)
108 #define BIOCSETIF _IOW('B',108, struct ifreq)
109 #define BIOCSRTIMEOUT _IOW('B',109, struct timeval)
110 #define BIOCGRTIMEOUT _IOR('B',110, struct timeval)
111 #define BIOCGSTATS _IOR('B',111, struct bpf_stat)
112 #define BIOCIMMEDIATE _IOW('B',112, u_int)
113 #define BIOCVERSION _IOR('B',113, struct bpf_version)
114 #define BIOCGRSIG _IOR('B',114, u_int)
115 #define BIOCSRSIG _IOW('B',115, u_int)
116 #define BIOCGHDRCMPLT _IOR('B',116, u_int)
117 #define BIOCSHDRCMPLT _IOW('B',117, u_int)
118 #define BIOCGSEESENT _IOR('B',118, u_int)
119 #define BIOCSSEESENT _IOW('B',119, u_int)
122 * Structure prepended to each packet.
125 struct timeval bh_tstamp; /* time stamp */
126 bpf_u_int32 bh_caplen; /* length of captured portion */
127 bpf_u_int32 bh_datalen; /* original length of packet */
128 u_short bh_hdrlen; /* length of bpf header (this struct
129 plus alignment padding) */
132 * Because the structure above is not a multiple of 4 bytes, some compilers
133 * will insist on inserting padding; hence, sizeof(struct bpf_hdr) won't work.
134 * Only the kernel needs to know about it; applications use bh_hdrlen.
137 #define SIZEOF_BPF_HDR (sizeof(struct bpf_hdr) <= 20 ? 18 : \
138 sizeof(struct bpf_hdr))
142 * Data-link level type codes.
144 #define DLT_NULL 0 /* no link-layer encapsulation */
145 #define DLT_EN10MB 1 /* Ethernet (10Mb) */
146 #define DLT_EN3MB 2 /* Experimental Ethernet (3Mb) */
147 #define DLT_AX25 3 /* Amateur Radio AX.25 */
148 #define DLT_PRONET 4 /* Proteon ProNET Token Ring */
149 #define DLT_CHAOS 5 /* Chaos */
150 #define DLT_IEEE802 6 /* IEEE 802 Networks */
151 #define DLT_ARCNET 7 /* ARCNET */
152 #define DLT_SLIP 8 /* Serial Line IP */
153 #define DLT_PPP 9 /* Point-to-point Protocol */
154 #define DLT_FDDI 10 /* FDDI */
155 #define DLT_ATM_RFC1483 11 /* LLC/SNAP encapsulated atm */
156 #define DLT_RAW 12 /* raw IP */
159 * These are values from BSD/OS's "bpf.h".
160 * These are not the same as the values from the traditional libpcap
161 * "bpf.h"; however, these values shouldn't be generated by any
162 * OS other than BSD/OS, so the correct values to use here are the
165 * Platforms that have already assigned these values to other
166 * DLT_ codes, however, should give these codes the values
167 * from that platform, so that programs that use these codes will
168 * continue to compile - even though they won't correctly read
169 * files of these types.
171 #define DLT_SLIP_BSDOS 15 /* BSD/OS Serial Line IP */
172 #define DLT_PPP_BSDOS 16 /* BSD/OS Point-to-point Protocol */
174 #define DLT_ATM_CLIP 19 /* Linux Classical-IP over ATM */
177 * These values are defined by NetBSD; other platforms should refrain from
178 * using them for other purposes, so that NetBSD savefiles with link
179 * types of 50 or 51 can be read as this type on all platforms.
181 #define DLT_PPP_SERIAL 50 /* PPP over serial with HDLC encapsulation */
182 #define DLT_PPP_ETHER 51 /* PPP over Ethernet */
185 * This value was defined by libpcap 0.5; platforms that have defined
186 * it with a different value should define it here with that value -
187 * a link type of 104 in a save file will be mapped to DLT_C_HDLC,
188 * whatever value that happens to be, so programs will correctly
189 * handle files with that link type regardless of the value of
192 * The name DLT_C_HDLC was used by BSD/OS; we use that name for source
193 * compatibility with programs written for BSD/OS.
195 * libpcap 0.5 defined it as DLT_CHDLC; we define DLT_CHDLC as well,
196 * for source compatibility with programs written for libpcap 0.5.
198 #define DLT_C_HDLC 104 /* Cisco HDLC */
199 #define DLT_CHDLC DLT_C_HDLC
201 #define DLT_IEEE802_11 105 /* IEEE 802.11 wireless */
204 * Values between 106 and 107 are used in capture file headers as
205 * link-layer types corresponding to DLT_ types that might differ
206 * between platforms; don't use those values for new DLT_ new types.
210 * OpenBSD DLT_LOOP, for loopback devices; it's like DLT_NULL, except
211 * that the AF_ type in the link-layer header is in network byte order.
213 * OpenBSD defines it as 12, but that collides with DLT_RAW, so we
214 * define it as 108 here. If OpenBSD picks up this file, it should
215 * define DLT_LOOP as 12 in its version, as per the comment above -
216 * and should not use 108 as a DLT_ value.
221 * Values between 109 and 112 are used in capture file headers as
222 * link-layer types corresponding to DLT_ types that might differ
223 * between platforms; don't use those values for new DLT_ new types.
227 * This is for Linux cooked sockets.
229 #define DLT_LINUX_SLL 113
232 * Apple LocalTalk hardware.
234 #define DLT_LTALK 114
239 #define DLT_ECONET 115
242 * Reserved for use with OpenBSD ipfilter.
244 #define DLT_IPFILTER 116
247 * Reserved for use in capture-file headers as a link-layer type
248 * corresponding to OpenBSD DLT_PFLOG; DLT_PFLOG is 17 in OpenBSD,
249 * but that's DLT_LANE8023 in SuSE 6.3, so we can't use 17 for it
250 * in capture-file headers.
252 #define DLT_PFLOG 117
255 * Registered for Cisco-internal use.
257 #define DLT_CISCO_IOS 118
260 * Reserved for 802.11 cards using the Prism II chips, with a link-layer
261 * header including Prism monitor mode information plus an 802.11
264 #define DLT_PRISM_HEADER 119
267 * Reserved for Aironet 802.11 cards, with an Aironet link-layer header
268 * (see Doug Ambrisko's FreeBSD patches).
270 #define DLT_AIRONET_HEADER 120
273 * Reserved for use by OpenBSD's pfsync device.
275 #define DLT_PFSYNC 121
278 * The instruction encodings.
280 /* instruction classes */
281 #define BPF_CLASS(code) ((code) & 0x07)
289 #define BPF_MISC 0x07
292 #define BPF_SIZE(code) ((code) & 0x18)
296 #define BPF_MODE(code) ((code) & 0xe0)
305 #define BPF_OP(code) ((code) & 0xf0)
319 #define BPF_JSET 0x40
320 #define BPF_SRC(code) ((code) & 0x08)
324 /* ret - BPF_K and BPF_X also apply */
325 #define BPF_RVAL(code) ((code) & 0x18)
329 #define BPF_MISCOP(code) ((code) & 0xf8)
334 * The instruction data structure.
344 * Macros for insn array initializers.
346 #define BPF_STMT(code, k) { (u_short)(code), 0, 0, k }
347 #define BPF_JUMP(code, k, jt, jf) { (u_short)(code), jt, jf, k }
350 int bpf_validate (const struct bpf_insn *, int);
351 void bpf_tap (struct ifnet *, u_char *, u_int);
352 void bpf_mtap (struct ifnet *, struct mbuf *);
353 void bpfattach (struct ifnet *, u_int, u_int);
354 void bpfdetach (struct ifnet *);
356 void bpfilterattach (int);
357 u_int bpf_filter (const struct bpf_insn *, u_char *, u_int, u_int);
360 #define BPF_TAP(_ifp,_pkt,_pktlen) do { \
361 if ((_ifp)->if_bpf) \
362 bpf_tap((_ifp), (_pkt), (_pktlen)); \
364 #define BPF_MTAP(_ifp,_m) do { \
365 if ((_ifp)->if_bpf) { \
366 bpf_mtap((_ifp), (_m)); \
371 * Number of scratch memory words (for BPF_LD|BPF_MEM and BPF_ST).
373 #define BPF_MEMWORDS 16