bpf_jitter.c revision 182173 
1/*-
2 * Copyright (C) 2002-2003 NetGroup, Politecnico di Torino (Italy)
3 * Copyright (C) 2005-2008 Jung-uk Kim <jkim@FreeBSD.org>
4 * All rights reserved.
5 *
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
8 * are met:
9 *
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 * 3. Neither the name of the Politecnico di Torino nor the names of its
16 * contributors may be used to endorse or promote products derived from
17 * this software without specific prior written permission.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
20 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
21 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
22 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
23 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
24 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
25 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
26 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
27 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
28 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
29 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
30 */
31
32#include <sys/cdefs.h>
33__FBSDID("$FreeBSD: head/sys/net/bpf_jitter.c 182173 2008-08-25 20:43:13Z jkim $");
34
35#ifdef _KERNEL
36#include "opt_bpf.h"
37
38#include <sys/param.h>
39#include <sys/kernel.h>
40#include <sys/malloc.h>
41#include <sys/mbuf.h>
42#include <sys/sysctl.h>
43#else
44#include <stdlib.h>
45#include <sys/types.h>
46#endif
47
48#include <net/bpf.h>
49#include <net/bpf_jitter.h>
50
51bpf_filter_func	bpf_jit_compile(struct bpf_insn *, u_int, int *);
52
53#ifdef _KERNEL
54MALLOC_DEFINE(M_BPFJIT, "BPF_JIT", "BPF JIT compiler");
55
56SYSCTL_NODE(_net, OID_AUTO, bpf_jitter, CTLFLAG_RW, 0, "BPF JIT compiler");
57int bpf_jitter_enable = 1;
58SYSCTL_INT(_net_bpf_jitter, OID_AUTO, enable, CTLFLAG_RW,
59    &bpf_jitter_enable, 0, "enable BPF JIT compiler");
60
61bpf_jit_filter *
62bpf_jitter(struct bpf_insn *fp, int nins)
63{
64	bpf_jit_filter *filter;
65
66	/* Allocate the filter structure */
67	filter = (struct bpf_jit_filter *)malloc(sizeof(*filter),
68	    M_BPFJIT, M_NOWAIT);
69	if (filter == NULL)
70		return (NULL);
71
72	/* Create the binary */
73	if ((filter->func = bpf_jit_compile(fp, nins, filter->mem)) == NULL) {
74		free(filter, M_BPFJIT);
75		return (NULL);
76	}
77
78	return (filter);
79}
80
81void
82bpf_destroy_jit_filter(bpf_jit_filter *filter)
83{
84
85	free(filter->func, M_BPFJIT);
86	free(filter, M_BPFJIT);
87}
88#else
89bpf_jit_filter *
90bpf_jitter(struct bpf_insn *fp, int nins)
91{
92	bpf_jit_filter *filter;
93
94	/* Allocate the filter structure */
95	filter = (struct bpf_jit_filter *)malloc(sizeof(*filter));
96	if (filter == NULL)
97		return (NULL);
98
99	/* Create the binary */
100	if ((filter->func = bpf_jit_compile(fp, nins, filter->mem)) == NULL) {
101		free(filter);
102		return (NULL);
103	}
104
105	return (filter);
106}
107
108void
109bpf_destroy_jit_filter(bpf_jit_filter *filter)
110{
111
112	free(filter->func);
113	free(filter);
114}
115#endif
116