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
27 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
28 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
29 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
30 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
31 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
32 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
33 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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
47 /* BSD style release date */
48 #define BPF_RELEASE 199606
50 typedef int32_t bpf_int32;
51 typedef u_int32_t bpf_u_int32;
54 * Alignment macros. BPF_WORDALIGN rounds up to the next
55 * even multiple of BPF_ALIGNMENT.
57 #define BPF_ALIGNMENT sizeof(long)
58 #define BPF_WORDALIGN(x) (((x)+(BPF_ALIGNMENT-1))&~(BPF_ALIGNMENT-1))
60 #define BPF_MAXINSNS 512
61 #define BPF_MAXBUFSIZE 0x80000
62 #define BPF_MINBUFSIZE 32
65 * Structure for BIOCSETF.
69 struct bpf_insn *bf_insns;
73 * Struct returned by BIOCGSTATS.
76 u_int bs_recv; /* number of packets received */
77 u_int bs_drop; /* number of packets dropped */
81 * Struct return by BIOCVERSION. This represents the version number of
82 * the filter language described by the instruction encodings below.
83 * bpf understands a program iff kernel_major == filter_major &&
84 * kernel_minor >= filter_minor, that is, if the value returned by the
85 * running kernel has the same major number and a minor number equal
86 * equal to or less than the filter being downloaded. Otherwise, the
87 * results are undefined, meaning an error may be returned or packets
88 * may be accepted haphazardly.
89 * It has nothing to do with the source code version.
95 /* Current version number of filter architecture. */
96 #define BPF_MAJOR_VERSION 1
97 #define BPF_MINOR_VERSION 1
99 #define BIOCGBLEN _IOR('B',102, u_int)
100 #define BIOCSBLEN _IOWR('B',102, u_int)
101 #define BIOCSETF _IOW('B',103, struct bpf_program)
102 #define BIOCFLUSH _IO('B',104)
103 #define BIOCPROMISC _IO('B',105)
104 #define BIOCGDLT _IOR('B',106, u_int)
105 #define BIOCGETIF _IOR('B',107, struct ifreq)
106 #define BIOCSETIF _IOW('B',108, struct ifreq)
107 #define BIOCSRTIMEOUT _IOW('B',109, struct timeval)
108 #define BIOCGRTIMEOUT _IOR('B',110, struct timeval)
109 #define BIOCGSTATS _IOR('B',111, struct bpf_stat)
110 #define BIOCIMMEDIATE _IOW('B',112, u_int)
111 #define BIOCVERSION _IOR('B',113, struct bpf_version)
112 #define BIOCGRSIG _IOR('B',114, u_int)
113 #define BIOCSRSIG _IOW('B',115, u_int)
114 #define BIOCGHDRCMPLT _IOR('B',116, u_int)
115 #define BIOCSHDRCMPLT _IOW('B',117, u_int)
116 #define BIOCGSEESENT _IOR('B',118, u_int)
117 #define BIOCSSEESENT _IOW('B',119, u_int)
120 * Structure prepended to each packet.
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) */
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.
135 #define SIZEOF_BPF_HDR (sizeof(struct bpf_hdr) <= 20 ? 18 : \
136 sizeof(struct bpf_hdr))
140 * Data-link level type codes.
142 #define DLT_NULL 0 /* no link-layer 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 */
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
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.
169 #define DLT_SLIP_BSDOS 15 /* BSD/OS Serial Line IP */
170 #define DLT_PPP_BSDOS 16 /* BSD/OS Point-to-point Protocol */
172 #define DLT_ATM_CLIP 19 /* Linux Classical-IP over ATM */
175 * This value is defined by NetBSD; other platforms should refrain from
176 * using it for other purposes, so that NetBSD savefiles with a link
177 * type of 50 can be read as this type on all platforms.
179 #define DLT_PPP_SERIAL 50 /* PPP over serial with HDLC encapsulation */
182 * This value was defined by libpcap 0.5; platforms that have defined
183 * it with a different value should define it here with that value -
184 * a link type of 104 in a save file will be mapped to DLT_C_HDLC,
185 * whatever value that happens to be, so programs will correctly
186 * handle files with that link type regardless of the value of
189 * The name DLT_C_HDLC was used by BSD/OS; we use that name for source
190 * compatibility with programs written for BSD/OS.
192 * libpcap 0.5 defined it as DLT_CHDLC; we define DLT_CHDLC as well,
193 * for source compatibility with programs written for libpcap 0.5.
195 #define DLT_C_HDLC 104 /* Cisco HDLC */
196 #define DLT_CHDLC DLT_C_HDLC
199 * Reserved for future use.
200 * Do not pick other numerical value for these unless you have also
201 * picked up the tcpdump.org top-of-CVS-tree version of "savefile.c",
202 * which will arrange that capture files for these DLT_ types have
203 * the same "network" value on all platforms, regardless of what
204 * value is chosen for their DLT_ type (thus allowing captures made
205 * on one platform to be read on other platforms, even if the two
206 * platforms don't use the same numerical values for all DLT_ types).
208 #define DLT_IEEE802_11 105 /* IEEE 802.11 wireless */
211 * Values between 106 and 107 are used in capture file headers as
212 * link-layer types corresponding to DLT_ types that might differ
213 * between platforms; don't use those values for new DLT_ new types.
217 * OpenBSD DLT_LOOP, for loopback devices; it's like DLT_NULL, except
218 * that the AF_ type in the link-layer header is in network byte order.
220 * OpenBSD defines it as 12, but that collides with DLT_RAW, so we
221 * define it as 108 here. If OpenBSD picks up this file, it should
222 * define DLT_LOOP as 12 in its version, as per the comment above -
223 * and should not use 108 for any purpose.
228 * Values between 109 and 112 are used in capture file headers as
229 * link-layer types corresponding to DLT_ types that might differ
230 * between platforms; don't use those values for new DLT_ new types.
234 * This is for Linux cooked sockets.
236 #define DLT_LINUX_SLL 113
239 * The instruction encodings.
241 /* instruction classes */
242 #define BPF_CLASS(code) ((code) & 0x07)
250 #define BPF_MISC 0x07
253 #define BPF_SIZE(code) ((code) & 0x18)
257 #define BPF_MODE(code) ((code) & 0xe0)
266 #define BPF_OP(code) ((code) & 0xf0)
280 #define BPF_JSET 0x40
281 #define BPF_SRC(code) ((code) & 0x08)
285 /* ret - BPF_K and BPF_X also apply */
286 #define BPF_RVAL(code) ((code) & 0x18)
290 #define BPF_MISCOP(code) ((code) & 0xf8)
295 * The instruction data structure.
305 * Macros for insn array initializers.
307 #define BPF_STMT(code, k) { (u_short)(code), 0, 0, k }
308 #define BPF_JUMP(code, k, jt, jf) { (u_short)(code), jt, jf, k }
311 int bpf_validate __P((const struct bpf_insn *, int));
312 void bpf_tap __P((struct ifnet *, u_char *, u_int));
313 void bpf_mtap __P((struct ifnet *, struct mbuf *));
314 void bpfattach __P((struct ifnet *, u_int, u_int));
315 void bpfdetach __P((struct ifnet *));
317 void bpfilterattach __P((int));
318 u_int bpf_filter __P((const struct bpf_insn *, u_char *, u_int, u_int));
322 * Number of scratch memory words (for BPF_LD|BPF_MEM and BPF_ST).
324 #define BPF_MEMWORDS 16