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 * 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.
25 *
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
36 * SUCH DAMAGE.
37 *
38 * @(#)bpf.h 8.1 (Berkeley) 6/10/93
39 * @(#)bpf.h 1.34 (LBL) 6/16/96
40 *
41 * $FreeBSD$
42 */
43
44 #ifndef _NET_BPF_H_
45 #define _NET_BPF_H_
46
47 /* BSD style release date */
48 #define BPF_RELEASE 199606
49
50 typedef int32_t bpf_int32;
51 typedef u_int32_t bpf_u_int32;
52
53 /*
54 * Alignment macros. BPF_WORDALIGN rounds up to the next
55 * even multiple of BPF_ALIGNMENT.
56 */
57 #define BPF_ALIGNMENT sizeof(long)
58 #define BPF_WORDALIGN(x) (((x)+(BPF_ALIGNMENT-1))&~(BPF_ALIGNMENT-1))
59
60 #define BPF_MAXINSNS 512
61 #define BPF_MAXBUFSIZE 0x80000
62 #define BPF_MINBUFSIZE 32
63
64 /*
65 * Structure for BIOCSETF.
66 */
67 struct bpf_program {
68 u_int bf_len;
69 struct bpf_insn *bf_insns;
70 };
71
72 /*
73 * Struct returned by BIOCGSTATS.
74 */
75 struct bpf_stat {
76 u_int bs_recv; /* number of packets received */
77 u_int bs_drop; /* number of packets dropped */
78 };
79
80 /*
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.
90 */
91 struct bpf_version {
92 u_short bv_major;
93 u_short bv_minor;
94 };
95 /* Current version number of filter architecture. */
96 #define BPF_MAJOR_VERSION 1
97 #define BPF_MINOR_VERSION 1
98
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)
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 * This value was defined by libpcap 0.5; platforms that have defined
184 * it with a different value should define it here with that value -
185 * a link type of 104 in a save file will be mapped to DLT_C_HDLC,
186 * whatever value that happens to be, so programs will correctly
187 * handle files with that link type regardless of the value of
188 * DLT_C_HDLC.
189 *
190 * The name DLT_C_HDLC was used by BSD/OS; we use that name for source
191 * compatibility with programs written for BSD/OS.
192 *
193 * libpcap 0.5 defined it as DLT_CHDLC; we define DLT_CHDLC as well,
194 * for source compatibility with programs written for libpcap 0.5.
195 */
196 #define DLT_C_HDLC 104 /* Cisco HDLC */
197 #define DLT_CHDLC DLT_C_HDLC
198
199 #define DLT_IEEE802_11 105 /* IEEE 802.11 wireless */
200
201 /*
202 * Values between 106 and 107 are used in capture file headers as
203 * link-layer types corresponding to DLT_ types that might differ
204 * between platforms; don't use those values for new DLT_ new types.
205 */
206
207 /*
208 * OpenBSD DLT_LOOP, for loopback devices; it's like DLT_NULL, except
209 * that the AF_ type in the link-layer header is in network byte order.
210 *
211 * OpenBSD defines it as 12, but that collides with DLT_RAW, so we
212 * define it as 108 here. If OpenBSD picks up this file, it should
213 * define DLT_LOOP as 12 in its version, as per the comment above -
214 * and should not use 108 as a DLT_ value.
215 */
216 #define DLT_LOOP 108
217
218 /*
219 * Values between 109 and 112 are used in capture file headers as
220 * link-layer types corresponding to DLT_ types that might differ
221 * between platforms; don't use those values for new DLT_ new types.
222 */
223
224 /*
225 * This is for Linux cooked sockets.
226 */
227 #define DLT_LINUX_SLL 113
228
229 /*
230 * Apple LocalTalk hardware.
231 */
232 #define DLT_LTALK 114
233
234 /*
235 * Acorn Econet.
236 */
237 #define DLT_ECONET 115
238
239 /*
240 * Reserved for use with OpenBSD ipfilter.
241 */
242 #define DLT_IPFILTER 116
243
244 /*
245 * Reserved for use in capture-file headers as a link-layer type
246 * corresponding to OpenBSD DLT_PFLOG; DLT_PFLOG is 17 in OpenBSD,
247 * but that's DLT_LANE8023 in SuSE 6.3, so we can't use 17 for it
248 * in capture-file headers.
249 */
250 #define DLT_PFLOG 117
251
252 /*
253 * Registered for Cisco-internal use.
254 */
255 #define DLT_CISCO_IOS 118
256
257 /*
258 * Reserved for 802.11 cards using the Prism II chips, with a link-layer
259 * header including Prism monitor mode information plus an 802.11
260 * header.
261 */
262 #define DLT_PRISM_HEADER 119
263
264 /*
265 * Reserved for Aironet 802.11 cards, with an Aironet link-layer header
266 * (see Doug Ambrisko's FreeBSD patches).
267 */
268 #define DLT_AIRONET_HEADER 120
269
270 /*
271 * The instruction encodings.
272 */
273 /* instruction classes */
274 #define BPF_CLASS(code) ((code) & 0x07)
275 #define BPF_LD 0x00
276 #define BPF_LDX 0x01
277 #define BPF_ST 0x02
278 #define BPF_STX 0x03
279 #define BPF_ALU 0x04
280 #define BPF_JMP 0x05
281 #define BPF_RET 0x06
282 #define BPF_MISC 0x07
283
284 /* ld/ldx fields */
285 #define BPF_SIZE(code) ((code) & 0x18)
286 #define BPF_W 0x00
287 #define BPF_H 0x08
288 #define BPF_B 0x10
289 #define BPF_MODE(code) ((code) & 0xe0)
290 #define BPF_IMM 0x00
291 #define BPF_ABS 0x20
292 #define BPF_IND 0x40
293 #define BPF_MEM 0x60
294 #define BPF_LEN 0x80
295 #define BPF_MSH 0xa0
296
297 /* alu/jmp fields */
298 #define BPF_OP(code) ((code) & 0xf0)
299 #define BPF_ADD 0x00
300 #define BPF_SUB 0x10
301 #define BPF_MUL 0x20
302 #define BPF_DIV 0x30
303 #define BPF_OR 0x40
304 #define BPF_AND 0x50
305 #define BPF_LSH 0x60
306 #define BPF_RSH 0x70
307 #define BPF_NEG 0x80
308 #define BPF_JA 0x00
309 #define BPF_JEQ 0x10
310 #define BPF_JGT 0x20
311 #define BPF_JGE 0x30
312 #define BPF_JSET 0x40
313 #define BPF_SRC(code) ((code) & 0x08)
314 #define BPF_K 0x00
315 #define BPF_X 0x08
316
317 /* ret - BPF_K and BPF_X also apply */
318 #define BPF_RVAL(code) ((code) & 0x18)
319 #define BPF_A 0x10
320
321 /* misc */
322 #define BPF_MISCOP(code) ((code) & 0xf8)
323 #define BPF_TAX 0x00
324 #define BPF_TXA 0x80
325
326 /*
327 * The instruction data structure.
328 */
329 struct bpf_insn {
330 u_short code;
331 u_char jt;
332 u_char jf;
333 bpf_u_int32 k;
334 };
335
336 /*
337 * Macros for insn array initializers.
338 */
339 #define BPF_STMT(code, k) { (u_short)(code), 0, 0, k }
340 #define BPF_JUMP(code, k, jt, jf) { (u_short)(code), jt, jf, k }
341
342 #ifdef _KERNEL
343 int bpf_validate __P((const struct bpf_insn *, int));
344 void bpf_tap __P((struct ifnet *, u_char *, u_int));
345 void bpf_mtap __P((struct ifnet *, struct mbuf *));
346 void bpfattach __P((struct ifnet *, u_int, u_int));
347 void bpfdetach __P((struct ifnet *));
348
349 void bpfilterattach __P((int));
350 u_int bpf_filter __P((const struct bpf_insn *, u_char *, u_int, u_int));
351 #endif
352
353 /*
354 * Number of scratch memory words (for BPF_LD|BPF_MEM and BPF_ST).
355 */
356 #define BPF_MEMWORDS 16
357
358 #endif
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