xref: /netbsd-src/sys/net/bpfjit.h (revision 6a493d6bc668897c91594964a732d38505b70cbb)
1 /*	$NetBSD: bpfjit.h,v 1.2 2013/11/15 00:12:44 rmind Exp $	*/
2 
3 /*-
4  * Copyright (c) 2011-2012 Alexander Nasonov.
5  * All rights reserved.
6  *
7  * Redistribution and use in source and binary forms, with or without
8  * modification, are permitted provided that the following conditions
9  * are met:
10  *
11  * 1. Redistributions of source code must retain the above copyright
12  *    notice, this list of conditions and the following disclaimer.
13  * 2. Redistributions in binary form must reproduce the above copyright
14  *    notice, this list of conditions and the following disclaimer in
15  *    the documentation and/or other materials provided with the
16  *    distribution.
17  *
18  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
19  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
20  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
21  * FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE
22  * COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
23  * INCIDENTAL, SPECIAL, EXEMPLARY OR CONSEQUENTIAL DAMAGES (INCLUDING,
24  * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
25  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
26  * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
27  * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
28  * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29  * SUCH DAMAGE.
30  */
31 
32 #ifndef _NET_BPFJIT_H_
33 #define _NET_BPFJIT_H_
34 
35 #ifndef _KERNEL
36 #include <stddef.h>
37 #include <stdint.h>
38 #endif
39 
40 #include <sys/types.h>
41 
42 #ifdef __linux
43 #include <pcap-bpf.h>
44 #else
45 #include <net/bpf.h>
46 #endif
47 
48 /*
49  * RETURN value and arguments of a function generated by sljit have sljit_uw
50  * type which can have a greater width than arguments below. In such cases,
51  * we rely on the fact that calling conventions use same registers for
52  * smaller types.
53  * SLJIT_MOV_UI is passed to sljit_emit_return() to make sure that the
54  * return value is truncated to unsigned int.
55  */
56 typedef unsigned int (*bpfjit_func_t)(const uint8_t *,
57     unsigned int, unsigned int);
58 
59 bpfjit_func_t bpfjit_generate_code(bpf_ctx_t *, struct bpf_insn *, size_t);
60 void bpfjit_free_code(bpfjit_func_t);
61 
62 #ifdef _KERNEL
63 struct bpfjit_ops {
64 	bpfjit_func_t (*bj_generate_code)(bpf_ctx_t *, struct bpf_insn *, size_t);
65 	void (*bj_free_code)(bpfjit_func_t);
66 };
67 
68 extern struct bpfjit_ops bpfjit_module_ops;
69 #endif
70 
71 #endif /* !_NET_BPFJIT_H_ */
72