xref: /illumos-gate/usr/src/uts/common/io/bpf/net/bpf.h (revision 0a0e9771ca0211c15f3ac4466b661c145feeb9e4)
1 /*	$NetBSD: bpf.h,v 1.50 2009/01/13 19:10:52 christos Exp $	*/
2 
3 /*
4  * Copyright (c) 1990, 1991, 1993
5  *	The Regents of the University of California.  All rights reserved.
6  *
7  * This code is derived from the Stanford/CMU enet packet filter,
8  * (net/enet.c) distributed as part of 4.3BSD, and code contributed
9  * to Berkeley by Steven McCanne and Van Jacobson both of Lawrence
10  * Berkeley Laboratory.
11  *
12  * Redistribution and use in source and binary forms, with or without
13  * modification, are permitted provided that the following conditions
14  * are met:
15  * 1. Redistributions of source code must retain the above copyright
16  *    notice, this list of conditions and the following disclaimer.
17  * 2. Redistributions in binary form must reproduce the above copyright
18  *    notice, this list of conditions and the following disclaimer in the
19  *    documentation and/or other materials provided with the distribution.
20  * 3. Neither the name of the University nor the names of its contributors
21  *    may be used to endorse or promote products derived from this software
22  *    without specific prior written permission.
23  *
24  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
25  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
26  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
27  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
28  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
29  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
30  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
31  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
32  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
33  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
34  * SUCH DAMAGE.
35  *
36  *	@(#)bpf.h	8.2 (Berkeley) 1/9/95
37  * @(#) Header: bpf.h,v 1.36 97/06/12 14:29:53 leres Exp  (LBL)
38  */
39 /*
40  * Copyright 2009 Sun Microsystems, Inc.  All rights reserved.
41  * Use is subject to license terms.
42  */
43 
44 #ifndef _NET_BPF_H_
45 #define	_NET_BPF_H_
46 
47 #include <sys/time.h>
48 #include <sys/types32.h>
49 #include <sys/ioccom.h>
50 
51 /* BSD style release date */
52 #define	BPF_RELEASE 199606
53 
54 typedef	int bpf_int32;
55 typedef	uint_t bpf_uint_t32;
56 typedef	uint_t bpf_u_int32;
57 
58 /*
59  * Alignment macros.  BPF_WORDALIGN rounds up to the next
60  * even multiple of BPF_ALIGNMENT.
61  */
62 #define	BPF_ALIGNMENT sizeof (uint32_t)
63 #define	BPF_WORDALIGN(x) (((x)+(BPF_ALIGNMENT-1))&~(BPF_ALIGNMENT-1))
64 
65 #define	BPF_MAXINSNS 512
66 #define	BPF_DFLTBUFSIZE (1024*1024)	/* default static upper limit */
67 #define	BPF_MAXBUFSIZE (1024*1024*16)	/* hard limit on sysctl'able value */
68 #define	BPF_MINBUFSIZE 32
69 
70 /*
71  *  Structure for BIOCSETF.
72  */
73 struct bpf_program {
74 	uint_t bf_len;
75 	struct bpf_insn *bf_insns;
76 };
77 struct bpf_program32 {
78 	uint_t bf_len;
79 	caddr32_t bf_insns;
80 };
81 
82 /*
83  * Struct returned by BIOCGSTATS and net.bpf.stats sysctl.
84  */
85 struct bpf_stat {
86 	uint64_t bs_recv;	/* number of packets received */
87 	uint64_t bs_drop;	/* number of packets dropped */
88 	uint64_t bs_capt;	/* number of packets captured */
89 	uint64_t bs_padding[13];
90 };
91 
92 /*
93  * Struct returned by BIOCGSTATSOLD.
94  */
95 struct bpf_stat_old {
96 	uint_t bs_recv;		/* number of packets received */
97 	uint_t bs_drop;		/* number of packets dropped */
98 };
99 
100 /*
101  * Struct return by BIOCVERSION.  This represents the version number of
102  * the filter language described by the instruction encodings below.
103  * bpf understands a program iff kernel_major == filter_major &&
104  * kernel_minor >= filter_minor, that is, if the value returned by the
105  * running kernel has the same major number and a minor number equal
106  * equal to or less than the filter being downloaded.  Otherwise, the
107  * results are undefined, meaning an error may be returned or packets
108  * may be accepted haphazardly.
109  * It has nothing to do with the source code version.
110  */
111 struct bpf_version {
112 	ushort_t bv_major;
113 	ushort_t bv_minor;
114 };
115 /* Current version number of filter architecture. */
116 #define	BPF_MAJOR_VERSION 1
117 #define	BPF_MINOR_VERSION 1
118 
119 /*
120  * BPF ioctls
121  *
122  * The first set is for compatibility with Sun's pcc style
123  * header files.  If your using gcc, we assume that you
124  * have run fixincludes so the latter set should work.
125  */
126 #define	BIOCGBLEN	 _IOR('B', 102, uint_t)
127 #define	BIOCSBLEN	_IOWR('B', 102, uint_t)
128 #define	BIOCSETF	 _IOW('B', 103, struct bpf_program)
129 #define	BIOCFLUSH	  _IO('B', 104)
130 #define	BIOCPROMISC	  _IO('B', 105)
131 #define	BIOCGDLT	 _IOR('B', 106, uint_t)
132 #define	BIOCGETIF	 _IOR('B', 107, struct ifreq)
133 #define	BIOCGETLIF	 _IOR('B', 107, struct lifreq)
134 #define	BIOCSETIF	 _IOW('B', 108, struct ifreq)
135 #define	BIOCSETLIF	 _IOW('B', 108, struct lifreq)
136 #define	BIOCGSTATS	 _IOR('B', 111, struct bpf_stat)
137 #define	BIOCGSTATSOLD	 _IOR('B', 111, struct bpf_stat_old)
138 #define	BIOCIMMEDIATE	 _IOW('B', 112, uint_t)
139 #define	BIOCVERSION	 _IOR('B', 113, struct bpf_version)
140 #define	BIOCSTCPF	 _IOW('B', 114, struct bpf_program)
141 #define	BIOCSUDPF	 _IOW('B', 115, struct bpf_program)
142 #define	BIOCGHDRCMPLT	 _IOR('B', 116, uint_t)
143 #define	BIOCSHDRCMPLT	 _IOW('B', 117, uint_t)
144 #define	BIOCSDLT	 _IOW('B', 118, uint_t)
145 #define	BIOCGDLTLIST	_IOWR('B', 119, struct bpf_dltlist)
146 #define	BIOCGSEESENT	 _IOR('B', 120, uint_t)
147 #define	BIOCSSEESENT	 _IOW('B', 121, uint_t)
148 #define	BIOCSRTIMEOUT	 _IOW('B', 122, struct timeval)
149 #define	BIOCGRTIMEOUT	 _IOR('B', 123, struct timeval)
150 /*
151  */
152 #define	BIOCSETF32	 _IOW('B', 103, struct bpf_program32)
153 #define	BIOCGDLTLIST32	_IOWR('B', 119, struct bpf_dltlist32)
154 #define	BIOCSRTIMEOUT32	 _IOW('B', 122, struct timeval32)
155 #define	BIOCGRTIMEOUT32	 _IOR('B', 123, struct timeval32)
156 
157 /*
158  * Structure prepended to each packet. This is "wire" format, so we
159  * cannot change it unfortunately to 64 bit times on 32 bit systems [yet].
160  */
161 struct bpf_timeval {
162 	int32_t tv_sec;
163 	int32_t tv_usec;
164 };
165 
166 struct bpf_hdr {
167 	struct bpf_timeval bh_tstamp;	/* time stamp */
168 	uint32_t	bh_caplen;	/* length of captured portion */
169 	uint32_t	bh_datalen;	/* original length of packet */
170 	uint16_t	bh_hdrlen;	/* length of bpf header (this struct */
171 					/*  plus alignment padding) */
172 };
173 /*
174  * Because the structure above is not a multiple of 4 bytes, some compilers
175  * will insist on inserting padding; hence, sizeof(struct bpf_hdr) won't work.
176  * Only the kernel needs to know about it; applications use bh_hdrlen.
177  * XXX To save a few bytes on 32-bit machines, we avoid end-of-struct
178  * XXX padding by using the size of the header data elements.  This is
179  * XXX fail-safe: on new machines, we just use the 'safe' sizeof.
180  */
181 #ifdef _KERNEL
182 #if defined(__arm32__) || defined(__i386__) || defined(__m68k__) || \
183     defined(__mips__) || defined(__ns32k__) || defined(__vax__) || \
184     defined(__sh__) || (defined(__sparc__) && !defined(__sparc64__))
185 #define	SIZEOF_BPF_HDR 18
186 #else
187 #define	SIZEOF_BPF_HDR sizeof (struct bpf_hdr)
188 #endif
189 #endif
190 
191 /* Pull in data-link level type codes. */
192 #include <net/dlt.h>
193 
194 /*
195  * The instruction encodings.
196  */
197 /* instruction classes */
198 #define	BPF_CLASS(code) ((code) & 0x07)
199 #define		BPF_LD		0x00
200 #define		BPF_LDX		0x01
201 #define		BPF_ST		0x02
202 #define		BPF_STX		0x03
203 #define		BPF_ALU		0x04
204 #define		BPF_JMP		0x05
205 #define		BPF_RET		0x06
206 #define		BPF_MISC	0x07
207 
208 /* ld/ldx fields */
209 #define	BPF_SIZE(code)	((code) & 0x18)
210 #define		BPF_W		0x00
211 #define		BPF_H		0x08
212 #define		BPF_B		0x10
213 #define	BPF_MODE(code)	((code) & 0xe0)
214 #define		BPF_IMM 	0x00
215 #define		BPF_ABS		0x20
216 #define		BPF_IND		0x40
217 #define		BPF_MEM		0x60
218 #define		BPF_LEN		0x80
219 #define		BPF_MSH		0xa0
220 
221 /* alu/jmp fields */
222 #define	BPF_OP(code)	((code) & 0xf0)
223 #define		BPF_ADD		0x00
224 #define		BPF_SUB		0x10
225 #define		BPF_MUL		0x20
226 #define		BPF_DIV		0x30
227 #define		BPF_OR		0x40
228 #define		BPF_AND		0x50
229 #define		BPF_LSH		0x60
230 #define		BPF_RSH		0x70
231 #define		BPF_NEG		0x80
232 #define		BPF_JA		0x00
233 #define		BPF_JEQ		0x10
234 #define		BPF_JGT		0x20
235 #define		BPF_JGE		0x30
236 #define		BPF_JSET	0x40
237 #define	BPF_SRC(code)	((code) & 0x08)
238 #define		BPF_K		0x00
239 #define		BPF_X		0x08
240 
241 /* ret - BPF_K and BPF_X also apply */
242 #define	BPF_RVAL(code)	((code) & 0x18)
243 #define		BPF_A		0x10
244 
245 /* misc */
246 #define	BPF_MISCOP(code) ((code) & 0xf8)
247 #define		BPF_TAX		0x00
248 #define		BPF_TXA		0x80
249 
250 /*
251  * The instruction data structure.
252  */
253 struct bpf_insn {
254 	uint16_t  code;
255 	uint8_t   jt;
256 	uint8_t   jf;
257 	uint32_t  k;
258 };
259 
260 /*
261  * Macros for insn array initializers.
262  */
263 #define	BPF_STMT(code, k) { (uint16_t)(code), 0, 0, k }
264 #define	BPF_JUMP(code, k, jt, jf) { (uint16_t)(code), jt, jf, k }
265 
266 /*
267  * Structure to retrieve available DLTs for the interface.
268  */
269 struct bpf_dltlist {
270 	uint_t	bfl_len;	/* number of bfd_list array */
271 	uint_t	*bfl_list;	/* array of DLTs */
272 };
273 struct bpf_dltlist32 {
274 	uint_t	bfl_len;
275 	caddr32_t bfl_list;
276 };
277 
278 #ifdef _KERNEL
279 #include <sys/mac.h>
280 #include <sys/dls_impl.h>
281 
282 typedef void (*bpf_itap_fn_t)(void *, mblk_t *, boolean_t, uint_t);
283 
284 extern void	bpfattach(uintptr_t, int, zoneid_t, int);
285 extern void	bpfdetach(uintptr_t);
286 extern uint_t	bpf_filter(struct bpf_insn *, uchar_t *, uint_t, uint_t);
287 extern void	bpf_itap(void *, mblk_t *, boolean_t, uint_t);
288 extern void	bpf_mtap(void *, mac_resource_handle_t, mblk_t *, boolean_t);
289 extern int	bpf_validate(struct bpf_insn *, int);
290 
291 #endif /* _KERNEL */
292 
293 /*
294  * Number of scratch memory words (for BPF_LD|BPF_MEM and BPF_ST).
295  */
296 #define	BPF_MEMWORDS 16
297 
298 #endif /* !_NET_BPF_H_ */
299