bpf_jitter.c revision 153157 
1/*-
2 * Copyright (c) 2002 - 2003 NetGroup, Politecnico di Torino (Italy)
3 * Copyright (c) 2005 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 153157 2005-12-06 07:22:01Z jkim $");
34
35#include "opt_bpf.h"
36
37#include <sys/param.h>
38#include <sys/kernel.h>
39#include <sys/malloc.h>
40#include <sys/mbuf.h>
41
42#include <net/bpf.h>
43#include <net/bpf_jitter.h>
44
45MALLOC_DEFINE(M_BPFJIT, "BPF_JIT", "BPF JIT compiler");
46
47bpf_filter_func	bpf_jit_compile(struct bpf_insn *, u_int, int *);
48
49bpf_jit_filter *
50bpf_jitter(struct bpf_insn *fp, int nins)
51{
52	bpf_jit_filter *filter;
53
54	/* Allocate the filter structure */
55	filter = (struct bpf_jit_filter *)malloc(sizeof(struct bpf_jit_filter),
56	    M_BPFJIT, M_NOWAIT);
57	if (filter == NULL)
58		return NULL;
59
60	/* Allocate the filter's memory */
61	filter->mem = (int *)malloc(BPF_MEMWORDS * sizeof(int),
62	    M_BPFJIT, M_NOWAIT);
63	if (filter->mem == NULL) {
64		free(filter, M_BPFJIT);
65		return NULL;
66	}
67
68	/* Create the binary */
69	if ((filter->func = bpf_jit_compile(fp, nins, filter->mem)) == NULL) {
70		free(filter->mem, M_BPFJIT);
71		free(filter, M_BPFJIT);
72		return NULL;
73	}
74
75	return filter;
76}
77
78void
79bpf_destroy_jit_filter(bpf_jit_filter *filter)
80{
81
82	free(filter->mem, M_BPFJIT);
83	free(filter->func, M_BPFJIT);
84	free(filter, M_BPFJIT);
85}
86