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 | */ |
55 | typedef unsigned int (*bpfjit_func_t)(const bpf_ctx_t *, bpf_args_t *); |
56 | |
57 | bpfjit_func_t bpfjit_generate_code(const bpf_ctx_t *, |
58 | const struct bpf_insn *, size_t); |
59 | void bpfjit_free_code(bpfjit_func_t); |
60 | |
61 | #ifdef _KERNEL |
62 | struct 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 | |
68 | extern struct bpfjit_ops bpfjit_module_ops; |
69 | #endif |
70 | |
71 | #endif /* !_NET_BPFJIT_H_ */ |
72 | |