1/* $NetBSD: bpfjit.h,v 1.4 2014/06/25 19:32:37 alnsn Exp $ */
2
3/*-
4 * Copyright (c) 2011-2014 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 of a function generated by sljit have sljit_uw type
50 * which can have a greater width. In such cases, we rely on the fact
51 * that calling conventions use same registers for smaller types.
52 * SLJIT_MOV_UI is passed to sljit_emit_return() to make sure that the
53 * return value is truncated to unsigned int.
54 */
55typedef unsigned int (*bpfjit_func_t)(const bpf_ctx_t *, bpf_args_t *);
56
57bpfjit_func_t bpfjit_generate_code(const bpf_ctx_t *,
58 const struct bpf_insn *, size_t);
59void bpfjit_free_code(bpfjit_func_t);
60
61#ifdef _KERNEL
62struct bpfjit_ops {
63 bpfjit_func_t (*bj_generate_code)(const bpf_ctx_t *,
64 const struct bpf_insn *, size_t);
65 void (*bj_free_code)(bpfjit_func_t);
66};
67
68extern struct bpfjit_ops bpfjit_module_ops;
69#endif
70
71#endif /* !_NET_BPFJIT_H_ */
72