FreeBSD/Linux Kernel Cross Reference
sys/net/bpf_jitter.h
1 /*-
2 * SPDX-License-Identifier: BSD-3-Clause
3 *
4 * Copyright (C) 2002-2003 NetGroup, Politecnico di Torino (Italy)
5 * Copyright (C) 2005-2009 Jung-uk Kim <jkim@FreeBSD.org>
6 * All rights reserved.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 *
12 * 1. Redistributions of source code must retain the above copyright
13 * notice, this list of conditions and the following disclaimer.
14 * 2. Redistributions in binary form must reproduce the above copyright
15 * notice, this list of conditions and the following disclaimer in the
16 * documentation and/or other materials provided with the distribution.
17 * 3. Neither the name of the Politecnico di Torino nor the names of its
18 * contributors may be used to endorse or promote products derived from
19 * this software without specific prior written permission.
20 *
21 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
22 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
23 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
24 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
25 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
26 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
27 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
28 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
29 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
30 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
31 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
32 *
33 * $FreeBSD$
34 */
35
36 #ifndef _NET_BPF_JITTER_H_
37 #define _NET_BPF_JITTER_H_
38
39 #ifdef _KERNEL
40 MALLOC_DECLARE(M_BPFJIT);
41 #endif
42
43 extern int bpf_jitter_enable;
44
45 /*
46 * Prototype of a filtering function created by the jitter.
47 *
48 * The syntax and the meaning of the parameters is analogous to the one of
49 * bpf_filter(). Notice that the filter is not among the parameters because
50 * it is hardwired in the function.
51 */
52 typedef u_int (*bpf_filter_func)(u_char *, u_int, u_int);
53
54 /* Structure describing a native filtering program created by the jitter. */
55 typedef struct bpf_jit_filter {
56 /* The native filtering binary, in the form of a bpf_filter_func. */
57 bpf_filter_func func;
58 size_t size;
59 } bpf_jit_filter;
60
61 /*
62 * BPF jitter, builds a machine function from a BPF program.
63 *
64 * param fp The BPF pseudo-assembly filter that will be translated
65 * into native code.
66 * param nins Number of instructions of the input filter.
67 * return The bpf_jit_filter structure containing the native filtering
68 * binary.
69 *
70 * bpf_jitter allocates the buffers for the new native filter and
71 * then translates the program pointed by fp calling bpf_jit_compile().
72 */
73 bpf_jit_filter *bpf_jitter(struct bpf_insn *fp, int nins);
74
75 /*
76 * Deletes a filtering function that was previously created by bpf_jitter().
77 *
78 * param filter The filter to destroy.
79 *
80 * This function frees the variuos buffers (code, memory, etc.) associated
81 * with a filtering function.
82 */
83 void bpf_destroy_jit_filter(bpf_jit_filter *filter);
84
85 /*
86 * Declarations for machine-dependent functions.
87 */
88 struct bpf_insn;
89
90 bpf_filter_func bpf_jit_compile(struct bpf_insn *, u_int, size_t *);
91
92 #endif /* _NET_BPF_JITTER_H_ */
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